// server.js
import fs from "fs";
import path from "path";
import crypto from "crypto";
import fetch from "node-fetch";
import express from "express";
import bodyParser from "body-parser";
import PDFDocument from "pdfkit";
import sharp from "sharp";
import moment from "moment-timezone";
import cors from "cors";

// Configuration (all from environment variables)
const BASE_URL = process.env.BASE_URL || "https://rakshitjan-cps-b2c.hf.space";
const ADMIN_EMAIL = process.env.ADMIN_EMAIL || "admin123@example.com";
const ADMIN_PASSWORD = process.env.ADMIN_PASSWORD || "SecurePass123";
const AES_KEY_STR = process.env.AES_KEY_STR || "7E892875A52C59A3B588306B13C31FBD";
const AES_IV_STR = process.env.AES_IV_STR || "XYE45DKJ0967GFAZ";
const GOOGLE_MAPS_API_KEY = process.env.GOOGLE_MAPS_API_KEY || "AIzaSyBpna0F0J-c9QNBh8lSnfT2Z2uzD_vS9Ag"; // For geocoding
const GEOAPIFY_API_KEY = process.env.GEOAPIFY_API_KEY || "ceaea8a8a8f14f46b73221384eb4b5f0" ; // For static maps
const LOGO_PATH = process.env.LOGO_PATH || "logo.png";
const statelist = JSON.parse(fs.readFileSync("state.json", "utf8"));
const citylist = JSON.parse(fs.readFileSync("city.json", "utf8"));
const districtlist = JSON.parse(fs.readFileSync("district.json", "utf8"));
const organizationlist = JSON.parse(fs.readFileSync("organization.json", "utf8"));
const genderlist = JSON.parse(fs.readFileSync("gender.json", "utf8"));
const qualificationlist = JSON.parse(fs.readFileSync("qualification.json", "utf8"));
const ownershiplist = JSON.parse(fs.readFileSync("ownership.json", "utf8"));
const app = express();
app.use(bodyParser.json({ limit: "50mb" }));

// Allow ALL origins
app.use(cors());

// Utility: convert cm to PDF points (1 pt = 1/72 in; 1 cm = 28.3464567 pt)
const CM = 28.3464567;
const A4_WIDTH = 595.2755905511812; // points (210mm)
const A4_HEIGHT = 841.8897637795277; // points (297mm)
const MARGIN = 1.2 * CM;

// AES encryption like Python's Crypto.Cipher AES-CBC w/ PKCS7 padding
function aesEncrypt(plaintext, keyStr, ivStr) {
  // Validate inputs
  if (!plaintext) throw new Error("Plaintext is required for encryption");
  if (!keyStr) throw new Error("AES key is required");
  if (!ivStr) throw new Error("AES IV is required");
  
  const key = Buffer.from(keyStr, "utf8");
  const iv = Buffer.from(ivStr, "utf8");
  
  // Validate key and IV lengths
  if (key.length !== 16 && key.length !== 24 && key.length !== 32) {
    throw new Error(`Invalid AES key length: ${key.length} bytes. Must be 16, 24, or 32 bytes.`);
  }
  
  // Node's createCipheriv uses PKCS#7 padding by default (called PKCS#5 in OpenSSL)
  const cipher = crypto.createCipheriv(`aes-${key.length * 8}-cbc`, key, iv);
  const encrypted = Buffer.concat([
    cipher.update(Buffer.from(plaintext, "utf8")), 
    cipher.final()
  ]);
  return encrypted.toString("base64");
}

// HTTP session mimic (we reuse fetch)
let token = null;
async function adminLogin() {
  try {
    // encrypt email same as python
    const encryptedEmail = aesEncrypt(ADMIN_EMAIL, AES_KEY_STR, AES_IV_STR);
    
    const payload = {
      email: encryptedEmail,
      password: ADMIN_PASSWORD
    };
    
    console.log(`Logging in to ${BASE_URL} with admin email...`);
    
    const res = await fetch(`${BASE_URL}/api/admin/login`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
      timeout: 30000
    });
    
    const data = await res.json();
    
    if (res.status !== 200 || !data.token) {
      console.error(`Login failed. Status: ${res.status}, Response:`, data);
      throw new Error(`Login failed: ${JSON.stringify(data)}`);
    }
    
    token = data.token;
    console.log("Admin login successful");
    return token;
  } catch (error) {
    console.error("Admin login error:", error.message);
    throw error;
  }
}

async function getCase(caseId) {
  if (!token) await adminLogin();
  
  console.log(`Fetching case ${caseId}...`);
  const res = await fetch(`${BASE_URL}/api/cases/${caseId}`, {
    headers: { 
      "Content-Type": "application/json", 
      "Authorization": `Bearer ${token}` 
    },
    timeout: 30000
  });
  
  if (!res.ok) {
    console.error(`Failed to get case ${caseId}: ${res.status} ${res.statusText}`);
    throw new Error(`Failed get_case: ${res.status}`);
  }
  
  return await res.json();
}

async function getFiles(caseId) {
  if (!token) await adminLogin();
  
  console.log(`Fetching files for case ${caseId}...`);
  const res = await fetch(`${BASE_URL}/api/cases/${caseId}/files`, {
    headers: { 
      "Content-Type": "application/json", 
      "Authorization": `Bearer ${token}` 
    },
    timeout: 60000
  });
  
  if (!res.ok) {
    console.error(`Failed to get files for case ${caseId}: ${res.status} ${res.statusText}`);
    throw new Error(`Failed get_files: ${res.status}`);
  }
  
  const json = await res.json();
  console.log(`Retrieved ${json.files?.length || 0} files for case ${caseId}`);
  return json.files || [];
}

async function downloadFile(fileId) {
  if (!token) await adminLogin();
  
  console.log(`Downloading file ${fileId}...`);
  const res = await fetch(`${BASE_URL}/api/files/${fileId}`, {
    headers: { "Authorization": `Bearer ${token}` },
    timeout: 60000
  });
  
  if (!res.ok) {
    console.error(`File download failed for ${fileId}: ${res.status} ${res.statusText}`);
    throw new Error(`File download failed for ${fileId}: ${res.status}`);
  }
  
  const buf = await res.arrayBuffer();
  return Buffer.from(buf);
}

// Google Maps Geocoding API helpers (for forward/reverse geocoding)
async function forwardGeocode(address) {
  if (!address) {
    console.log("No address provided for geocoding");
    return [null, null];
  }
  
  if (!GOOGLE_MAPS_API_KEY) {
    console.error("GOOGLE_MAPS_API_KEY is not set");
    return [null, null];
  }
  
  console.log(`Geocoding address: ${address.substring(0, 50)}...`);
  
  try {
    const url = `https://maps.googleapis.com/maps/api/geocode/json?address=${encodeURIComponent(address)}&key=${GOOGLE_MAPS_API_KEY}`;
    const res = await fetch(url, { timeout: 20000 });
    
    if (!res.ok) {
      console.error(`Geocoding API error: ${res.status} ${res.statusText}`);
      return [null, null];
    }
    
    const json = await res.json();
    
    if (json.status === "OK" && json.results && json.results[0] && json.results[0].geometry && json.results[0].geometry.location) {
      const loc = json.results[0].geometry.location;
      console.log(`Geocoding successful: ${loc.lat}, ${loc.lng}`);
      return [loc.lat, loc.lng];
    } else {
      console.warn(`Geocoding failed: ${json.status} - ${json.error_message || 'No results'}`);
      return [null, null];
    }
  } catch (error) {
    console.error("Geocoding error:", error.message);
    return [null, null];
  }
}

async function reverseGeocode(lat, lon) {
  if (lat == null || lon == null) {
    console.log("No coordinates provided for reverse geocoding");
    return "Unknown Address";
  }
  
  if (!GOOGLE_MAPS_API_KEY) {
    console.error("GOOGLE_MAPS_API_KEY is not set");
    return "Unknown Address";
  }
  
  console.log(`Reverse geocoding coordinates: ${lat}, ${lon}`);
  
  try {
    const url = `https://maps.googleapis.com/maps/api/geocode/json?latlng=${lat},${lon}&key=${GOOGLE_MAPS_API_KEY}`;
    const res = await fetch(url, { timeout: 20000 });
    
    if (!res.ok) {
      console.error(`Reverse geocoding API error: ${res.status} ${res.statusText}`);
      return "Unknown Address";
    }
    
    const json = await res.json();
    
    if (json.status === "OK" && json.results && json.results[0] && json.results[0].formatted_address) {
      const address = json.results[0].formatted_address;
      console.log(`Reverse geocoding successful: ${address.substring(0, 50)}...`);
      return address;
    } else {
      console.warn(`Reverse geocoding failed: ${json.status} - ${json.error_message || 'No results'}`);
      return "Unknown Address";
    }
  } catch (error) {
    console.error("Reverse geocoding error:", error.message);
    return "Unknown Address";
  }
}

// Geoapify Static Maps API (for static maps with markers and path)
async function staticMapWithPath(captureLat, captureLng, caseLat = null, caseLng = null, zoom = 17, size = "1800x600") {
  if (captureLat == null || captureLng == null) {
    console.log("No capture coordinates provided for static map");
    return null;
  }
  
  if (!GEOAPIFY_API_KEY) {
    console.error("GEOAPIFY_API_KEY is not set");
    return null;
  }
  
  console.log(`Generating static map for: ${captureLat}, ${captureLng}`);
  
  try {
    let parts = [
      `center=lonlat:${captureLng},${captureLat}`,
      `zoom=${zoom}`,
      `size=${size}`,
      `scaleFactor=2`,
      `marker=lonlat:${captureLng},${captureLat};color:%23ff0000;size:large`
    ];
    
    if (caseLat != null && caseLng != null) {
      parts.push(`marker=lonlat:${caseLng},${caseLat};color:%23007bff;size:large`);
      parts.push(`path=color:%23ff0000;weight:4|lonlat:${caseLng},${caseLat}|lonlat:${captureLng},${captureLat}`);
    }
    
    const url = `https://maps.geoapify.com/v1/staticmap?${parts.join("&")}&apiKey=${GEOAPIFY_API_KEY}`;
    const res = await fetch(url, { timeout: 30000 });
    
    if (!res.ok) {
      console.error(`Static map API error: ${res.status} ${res.statusText}`);
      return null;
    }
    
    const buf = Buffer.from(await res.arrayBuffer());
    console.log("Static map generated successfully");
    return buf;
  } catch (error) {
    console.error("Static map generation error:", error.message);
    return null;
  }
}

function haversineKm(lat1, lon1, lat2, lon2) {
  if ([lat1, lon1, lat2, lon2].some(v => v == null)) return null;
  const R = 6371.0;
  const phi1 = lat1 * Math.PI / 180;
  const phi2 = lat2 * Math.PI / 180;
  const dphi = (lat2 - lat1) * Math.PI / 180;
  const dlambda = (lon2 - lon1) * Math.PI / 180;
  const a = Math.sin(dphi / 2) * Math.sin(dphi / 2) + Math.cos(phi1) * Math.cos(phi2) * Math.sin(dlambda / 2) * Math.sin(dlambda / 2);
  return 2 * R * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
}

// date formatting to IST similar to fmt_ist in python
function fmtIST(dtStr) {
  if (!dtStr) return "N/A";
  try {
    // Accept Z or offset
    const m = moment(dtStr);
    const ist = m.tz("Asia/Kolkata").format("DD/MM/YYYY hh:mm:ss A") + " IST";
    return ist;
  } catch {
    return dtStr;
  }
}

function exportedOnStr() {
  return moment().tz("Asia/Kolkata").format("MMMM DD, YYYY");
}

// Mapping display names
const DISPLAY_NAME = {
  "aadhaar_photo": "Photo of Aadhar",
  "customer_photo": "Customer's Photo",
  "residence_photo": "Residence Photo",
  "business_photo": "Business Address Photo"
};
function displayType(fileType) {
  return DISPLAY_NAME[fileType] || fileType || "Upload";
}

// create thumbnail similar to Python make_thumb
async function makeThumb(imgBuf, maxW = 860, maxH = 640) {
  try {
    // produce an RGB JPEG/PNG buffer sized with thumbnail
    const img = sharp(imgBuf).rotate().resize({ width: maxW, height: maxH, fit: "inside" }).flatten({ background: { r: 255, g: 255, b: 255 } });
    const png = await img.png().toBuffer();
    // create bordered image by extending canvas
    const bordered = await sharp(png)
      .extend({ top: 1, bottom: 1, left: 1, right: 1, background: { r: 170, g: 170, b: 170 } })
      .png()
      .toBuffer();
    return bordered;
  } catch (error) {
    console.error("Thumbnail creation error:", error.message);
    // Return original buffer if thumbnail creation fails
    return imgBuf;
  }
}

// text wrapping helper that attempts to match Python's draw_wrapped_label_value.
// We measure text widths using doc.widthOfString and output lines manually at exact coordinates.
function drawWrappedLabelValue(doc, x, y, label, text, maxWidthCm = 16.0) {
  const maxW = maxWidthCm * CM;
  const fontSize = 10;
  doc.font("Helvetica").fontSize(fontSize);
  const labelStr = `${label}: `;
  const labelW = doc.widthOfString(labelStr);
  const words = (text || "N/A").toString().split(/\s+/);
  let first = true;
  let line = "";
  let width = 0;
  let lines = [];

  for (let w of words) {
    const w_w = doc.widthOfString(w + " ");
    if (first) {
      if (labelW + width + w_w < maxW) {
        line += w + " ";
        width += w_w;
      } else {
        lines.push(labelStr + line.trim());
        first = false;
        line = w + " ";
        width = w_w;
      }
    } else {
      if (width + w_w < maxW) {
        line += w + " ";
        width += w_w;
      } else {
        // indent roughly by label_w/6 characters -> compute pixels
        const indentText = " ".repeat(Math.max(0, Math.floor(labelW / (fontSize * 0.6))));
        lines.push(indentText + line.trim());
        line = w + " ";
        width = w_w;
      }
    }
  }
  if (first) {
    lines.push(labelStr + (line.trim()));
  } else {
    if (line) {
      const indentText = " ".repeat(Math.max(0, Math.floor(labelW / (fontSize * 0.6))));
      lines.push(indentText + line.trim());
    }
  }

  for (let ln of lines) {
    doc.text(ln, x, y, { lineBreak: false });
    y += 0.45 * CM;
  }
  return y;
}

// Draw header/footer helpers (matching positions & fonts from python)
function drawHeader(doc, title) {
  // header blue rectangle at top: height 2.4 cm
  doc.save();
  doc.rect(0, 0, A4_WIDTH, 2.4 * CM).fill("#0F61A8");
  // logo
  let titleX = MARGIN;
  if (fs.existsSync(LOGO_PATH)) {
    try {
      doc.image(LOGO_PATH, MARGIN, 0.2 * CM, { width: 2.4 * CM, height: 2.0 * CM });
      titleX = MARGIN + 2.6 * CM;
    } catch (e) {
      console.warn(`Could not load logo from ${LOGO_PATH}:`, e.message);
    }
  }
  doc.fillColor("white").font("Helvetica-Bold").fontSize(15).text(title, titleX, 0.9 * CM, { continued: false });
  doc.font("Helvetica").fontSize(10);
  const exp = `Exported on ${exportedOnStr()}`;
  // draw right-aligned
  const w = doc.widthOfString(exp);
  doc.fillColor("white").text(exp, A4_WIDTH - MARGIN - w, 1.0 * CM);
  doc.fillColor("black");
  doc.restore();
}

function drawFooter(doc, page) {
  doc.font("Helvetica").fontSize(9).text(`Page ${page}`, A4_WIDTH - MARGIN - 50, A4_HEIGHT - 1.0 * CM);
}

// Build PDF function (mirrors build_pdf in Python)
async function buildPdf(caseObj, files, outPath) {
  return new Promise(async (resolve, reject) => {
    try {
      console.log(`Building PDF for case ${caseObj.case_id} with ${files.length} files...`);
      
      const doc = new PDFDocument({ size: "A4", margin: 0 });
      const ws = fs.createWriteStream(outPath);
      doc.pipe(ws);

      let page = 1;
      // prepare address and geocode
      const ad = ((caseObj.demographic_details || {}).address_details) || {};
      const caseAddr = `${ad.residential_address || ""}, ${ad.city || ""}, ${ad.state || ""} ${ad.pincode || ""}`.trim();
      console.log(`Case address: ${caseAddr}`);
      
      const [caseLat, caseLng] = await forwardGeocode(caseAddr);
      if (caseLat && caseLng) {
        console.log(`Case coordinates: ${caseLat}, ${caseLng}`);
      }

      const title = `Name : ${caseObj.case_applicant_name || ""}`;
      drawHeader(doc, title);
      let y = 3.4 * CM;

      // Customer Details section
      const customerstate = statelist.find(state => state.id === caseObj.residenceDetail.stateId);
      const customerdistrict = districtlist.find(district => district.id === caseObj.residenceDetail.districtId);
      const customercity = citylist.find(city => city.id === caseObj.residenceDetail.cityId);
      const customeraddress=caseObj.residenceDetail.address1 +", "+ caseObj.residenceDetail.address2 +", "+ caseObj.residenceDetail.address3 +", "+customercity.city_name +", "+ customerdistrict.district_name +", "+ customerstate.state_name +", "+ caseObj.residenceDetail.pincode;
      y = sectionTitle(doc, "Customer Details", MARGIN, y);
      labelValue(doc, MARGIN, y, "Customer Name", caseObj.case_applicant_name); y += 0.6 * CM;
      labelValue(doc, MARGIN, y, "Customer ID", caseObj.case_id); y += 0.6 * CM;
      labelValue(doc, MARGIN, y, "Phone Number", caseObj.case_applicant_contact); y += 0.6 * CM;
      //const emailId = (caseObj.applicantDetail.email || {}).contact_information && (caseObj.demographic_details.contact_information.email_id);
      labelValue(doc, MARGIN, y, "Email", caseObj.applicantDetail.email); y += 0.6 * CM;
      y = drawWrappedLabelValue(doc, MARGIN, y, "Customer Address", customeraddress, 18.0); y += 0.6 * CM;

      // Inspection Summary
      y = sectionTitle(doc, "Inspection Summary", MARGIN, y);
      doc.font("Helvetica").fontSize(10);
      doc.text(`Request Started: ${fmtIST(caseObj.created_at)}`, MARGIN, y); y += 0.5 * CM;
      doc.text(`Total Uploads: ${files.length} uploads`, MARGIN, y); y += 0.5 * CM;
      doc.text(`Status: ${caseObj.status}`, MARGIN, y); y += 0.5 * CM;
      doc.text(`Priority: ${caseObj.priority}`, MARGIN, y); y += 0.7 * CM;

      // render static map if caseLat present (attempt)
      if (caseLat) {
        console.log("Generating overview map...");
        const mapBuf = await staticMapWithPath(caseLat, caseLng, caseLat, caseLng, 12);
        if (mapBuf) {
          // approximate map size used in python: map_h = H/2 + 2*cm
          const mapH = A4_HEIGHT / 2 + 2 * CM;
          const mapW = A4_WIDTH - 2 * MARGIN;
          doc.image(mapBuf, MARGIN, y, { width: mapW, height: mapH });
          y += mapH + 0.8 * CM;
        }
      }

      drawFooter(doc, page);
      doc.addPage(); page += 1;

      // Page 2: thumbnails
      drawHeader(doc, title);
      y = 3.4 * CM;
      doc.font("Helvetica-Bold").fontSize(14).text("Image Thumbnails", MARGIN, y);
      y += 0.8 * CM;

      const x0 = MARGIN;
      const y0 = y;
      const colW = (A4_WIDTH - 2 * MARGIN) / 3;
      const rowH = 6.1 * CM;

      for (let i = 0; i < Math.min(6, files.length); ++i) {
        const f = files[i];
        console.log(`Creating thumbnail for upload ${i+1} (${f.file_type})...`);
        const imgBuf = await makeThumb(f._bin);
        const col = i % 3;
        const row = Math.floor(i / 3);
        const xi = x0 + col * colW + 0.2 * CM;
        const yi = y0 + row * rowH + 4.6 * CM;
        // draw image within width colW-0.6cm and height 4 cm
        try {
          doc.image(imgBuf, xi, yi, { width: colW - 0.6 * CM, height: 4.0 * CM, align: "center", valign: "center" });
        } catch (e) { 
          console.warn(`Could not draw thumbnail ${i+1}:`, e.message);
        }
        doc.font("Helvetica").fontSize(9).text(`Upload ${i + 1} — ${displayType(f.file_type)}`, xi, yi - 0.3 * CM);
      }

      drawFooter(doc, page);
      doc.addPage(); page += 1;

      // Page 3: Demographic, Business, Financial
      drawHeader(doc, title);
      y = 3.4 * CM;
      y = sectionTitle(doc, "Demographic Details", MARGIN, y);
      const demo = caseObj.applicantDetail || {};
      const ci = demo.contact_information || {};
      const pd = demo.personal_details || {};
      const gender = genderlist.find(gender => gender.id === demo.genderId);
      const qualification = qualificationlist.find(qualification => qualification.id === demo.qualification);
      labelValue(doc, MARGIN, y, "Aadhaar Photo Match", demo.aadhaar_photo_match); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Email ID", demo.email); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Mobile Number", demo.mobile); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Gender", gender.gender_name); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Education", qualification.qualification_name); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Family Members", demo.numOfDependent); y += 1.0 * CM;

      y = sectionTitle(doc, "Business Details", MARGIN, y);
      const bd = caseObj.businessDetail || {};
      const ei = bd.enterprise_information || {};
      const bld = bd.business_location_details || {};
      const ba = bd.business_address || {};
      const state = statelist.find(state => state.id === bd.stateId);
      const district = districtlist.find(district => district.id === bd.districtId);
      const city = citylist.find(city => city.id === bd.cityId);
      const organization = organizationlist.find(organization => organization.id === bd.organizationType);
      //const city = citylist.find(city => city.id === bd.cityId);
      labelValue(doc, MARGIN, y, "Enterprise Name", bd.businessName); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Organization Type", organization.organization_name); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Business Location Type", bd.businessLocation); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Address", `${bd.address1} ${bd.address2} ${bd.landmark }`); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "City/District/State/Pincode", `${city.city_name || ""}/ ${district.district_name || ""}/ ${state.state_name || ""} - ${bd.pincode || ""}`); y += 1.0 * CM;

      y = sectionTitle(doc, "Financial Details", MARGIN, y);
      const fin = caseObj.financial_details || {};
      const bfi = fin.business_financial_information || {};
      const ffi = fin.family_financial_information || {};
      function fmtInr(v) {
        try {
          if (v == null || v === "" || isNaN(v)) return "N/A";
          const amount = parseInt(v);
          // Format with Indian numbering system and ₹ symbol
          return `₹ ${amount.toLocaleString('en-IN')}`;
        } catch {
          return "N/A";
        }
      }
      labelValue(doc, MARGIN, y, "Monthly Income", fmtInr(caseObj.incomeExpenditure.monthlyIncome)); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Monthly Expense", fmtInr(caseObj.familyExpenses.totalExp)); y += 0.5 * CM;
      labelValue(doc, MARGIN, y, "Family Income", fmtInr(caseObj.incomeExpenditure.totalIncome)); y += 0.5 * CM;

      drawFooter(doc, page);
      doc.addPage(); page += 1;

      // For each file, a detailed page
      for (let idx = 0; idx < files.length; ++idx) {
        const f = files[idx];
        console.log(`Processing detailed page for upload ${idx+1}...`);
        
        drawHeader(doc, title);
        y = 3.4 * CM;
        doc.font("Helvetica-Bold").fontSize(14).text(`Upload ${idx + 1} — ${displayType(f.file_type)}`, MARGIN, y);
        y += 0.8 * CM;

        // integrity_dashboard image insertion (if present)
        try {
          const integrityPath = "integrity_dashboard.png";
          if (fs.existsSync(integrityPath)) {
            const imageWidth = 16 * CM;
            const imageHeight = 2.5 * CM;
            const centerX = (A4_WIDTH - imageWidth) / 2;
            doc.image(integrityPath, centerX, y, { width: imageWidth, height: imageHeight });
            y = y + imageHeight + 0.8 * CM;
          } else {
            y += 0.5 * CM;
          }
        } catch (e) {
          y += 0.5 * CM;
        }

        const gl = f.geo_location || {};
        const lat = gl.lat;
        const lng = gl.lng;

        // draw the file image on left
        console.log(`Creating thumbnail for detailed view ${idx+1}...`);
        const imgBuf = await makeThumb(f._bin);
        try {
          doc.image(imgBuf, MARGIN, y, { width: 8.6 * CM, height: 9.0 * CM });
        } catch (e) {
          console.warn(`Could not draw main image ${idx+1}:`, e.message);
        }

        // draw static map for the single upload using Geoapify
        if (lat != null && lng != null) {
          console.log(`Generating static map for upload ${idx+1}...`);
          const mimgBuf = await staticMapWithPath(lat, lng, caseLat, caseLng, 17);
          if (mimgBuf) {
            try {
              doc.image(mimgBuf, 11.0 * CM, y, { width: 8.0 * CM, height: 9.0 * CM });
            } catch (e) {
              console.warn(`Could not draw static map ${idx+1}:`, e.message);
            }
          }
        }

        let yb = y + 10.4 * CM;
        // Use Google Maps for reverse geocoding
        const rev = await reverseGeocode(lat, lng);
        yb = drawWrappedLabelValue(doc, MARGIN, yb, "Location Address", rev, 18.0);

        const distKm = (caseLat != null && lat != null) ? haversineKm(caseLat, caseLng, lat, lng) : null;
        const distM = distKm ? Math.round(distKm * 1000) : null;
        doc.font("Helvetica").fontSize(10);
        doc.text(distM ? `Distance from case location: ${distM} meters` : "Distance from case location: N/A", MARGIN, yb);
        yb += 0.7 * CM;

        const upAt = fmtIST(f.uploaded_at);
        doc.text(`Uploaded At: ${upAt}`, MARGIN, yb); yb += 1.0 * CM;

        doc.font("Helvetica-Bold").fontSize(12).text("Metadata & Sensor Information", MARGIN, yb); yb += 0.6 * CM;
        doc.font("Helvetica").fontSize(10).text(`Server Time: ${upAt}`, MARGIN, yb); yb += 0.6 * CM;
        doc.text(`Device Time: ${upAt}`, MARGIN, yb); yb += 0.6 * CM;
        doc.text(distM ? `Accuracy: ${distM} meters` : "Distance from case location: N/A", MARGIN, yb); yb += 0.6 * CM;
        if (lat != null) {
          doc.text(`Geo: Lat ${lat.toFixed(6)}, Lng ${lng.toFixed(6)}`, MARGIN, yb);
        } else {
          doc.text("Geo: N/A", MARGIN, yb);
        }
        yb += 0.6 * CM;

        drawFooter(doc, page);
        doc.addPage(); page += 1;
      }

      // Timeline page (mirrors python)
      console.log("Creating timeline page...");
      drawHeader(doc, title);
      y = 3.4 * CM;
      doc.font("Helvetica-Bold").fontSize(14).text("Inspection Timeline", MARGIN, y); y += 0.8 * CM;

      // draw a rounded rect with a pale bg similar to python's setFillColorRGB
      doc.save();
      doc.roundedRect(MARGIN, y, A4_WIDTH - 2 * MARGIN, 1.1 * CM, 0.3 * CM).fillOpacity(1).fill("#E0F7E6");
      doc.fillColor("#1F743F").font("Helvetica-Bold").fontSize(12).text("Ready for Review", MARGIN + 0.6 * CM, y + 0.4 * CM);
      doc.fillColor("black");
      doc.restore();
      y += 2.0 * CM;

      const events = [];
      function evt(text, ts, sub = null) {
        if (ts) events.push({ text, ts, sub });
      }
      evt("Case Created", caseObj.created_at);
      evt("Assigned to Agent", caseObj.assigned_at);
      evt("Accepted by Agent", caseObj.accepted_at);
      for (let f of files) {
        const sub = await reverseGeocode((f.geo_location || {}).lat, (f.geo_location || {}).lng);
        evt(`Upload — ${displayType(f.file_type)}`, f.uploaded_at, sub);
      }
      evt("Case Updated", caseObj.updated_at);
      evt("Case Completed", caseObj.completed_at);

      function parseTs(s) {
        try {
          return new Date(s);
        } catch {
          return new Date(0);
        }
      }
      events.sort((a, b) => parseTs(a.ts) - parseTs(b.ts));

      for (let ev of events) {
        doc.font("Helvetica").fontSize(10).text(`• ${fmtIST(ev.ts)}`, MARGIN, y); y += 0.45 * CM;
        doc.font("Helvetica-Bold").fontSize(11).text(ev.text, MARGIN + 0.6 * CM, y); y += 0.45 * CM;
        if (ev.sub) {
          doc.font("Helvetica").fontSize(9).fillColor("gray");
          y = drawWrappedLabelValue(doc, MARGIN + 0.6 * CM, y, "Uploaded from", ev.sub, 17.0);
          doc.fillColor("black");
          y += 0.3 * CM;
        }
        y += 0.3 * CM;
        if (y > A4_HEIGHT - 3 * CM) {
          drawFooter(doc, page);
          doc.addPage(); page += 1;
          drawHeader(doc, title);
          y = 3.4 * CM;
          doc.font("Helvetica-Bold").fontSize(14).text("Inspection Timeline (Cont.)", MARGIN, y); y += 1.0 * CM;
        }
      }

      drawFooter(doc, page);
      doc.addPage(); // finalize
      doc.end();
      
      ws.on("finish", () => {
        console.log(`PDF created successfully at ${outPath}`);
        resolve();
      });
      ws.on("error", (e) => {
        console.error("PDF write stream error:", e);
        reject(e);
      });
    } catch (e) {
      console.error("PDF build error:", e);
      reject(e);
    }
  });
}

// small helpers to draw section title and label:value
function sectionTitle(doc, text, x, y) {
  doc.font("Helvetica-Bold").fontSize(14).text(text, x, y);
  return y + 0.9 * CM;
}

function labelValue(doc, x, y, label, value) {
  doc.font("Helvetica-Bold").fontSize(10).text(`${label}:`, x, y);
  doc.font("Helvetica").fontSize(10).text((value == null || value === "" || (Array.isArray(value) && value.length === 0)) ? "N/A" : value.toString(), x + 4.8 * CM, y);
}

// FastAPI-equivalent endpoints
app.get("/health", (req, res) => {
  console.log("Health check");
  res.json({ 
    status: "healthy",
    env_loaded: !!ADMIN_EMAIL && !!ADMIN_PASSWORD && !!AES_KEY_STR && !!AES_IV_STR
  });
});

app.post("/generate-report", async (req, res) => {
  console.log("Generate report request received");
  
  try {
    const caseId = (req.body || {}).case_id;
    if (!caseId) {
      console.error("Missing case_id in request");
      return res.status(400).json({ error: "case_id required" });
    }

    console.log(`Generating report for case: ${caseId}`);
    
    await adminLogin();
    const caseObj = await getCase(caseId);
    const files = await getFiles(caseId);
    console.log(caseObj)
    console.log(`Downloading ${files.length} files...`);
    // download binaries
    for (let i = 0; i < files.length; i++) {
      console.log(`Downloading file ${i+1}/${files.length}...`);
      files[i]._bin = await downloadFile(files[i].file_id);
    }

    // ensure output dir
    const outDir = "/app/output";
    if (!fs.existsSync(outDir)) {
      console.log(`Creating output directory: ${outDir}`);
      fs.mkdirSync(outDir, { recursive: true });
    }
    
    const outputFilename = `Report_${caseId}.pdf`;
    const outputPath = path.join(outDir, outputFilename);
    console.log(`Building PDF at: ${outputPath}`);

    await buildPdf(caseObj, files, outputPath);

    const pdfContent = fs.readFileSync(outputPath);
    // cleanup
    try { 
      fs.unlinkSync(outputPath); 
      console.log(`Cleaned up temporary file: ${outputPath}`);
    } catch { }

    console.log(`Sending PDF response: ${outputFilename} (${pdfContent.length} bytes)`);
    
    res.setHeader("Content-Type", "application/pdf");
    res.setHeader("Content-Disposition", `attachment; filename="${outputFilename}"`);
    res.send(pdfContent);
    
    console.log("PDF sent successfully");
  } catch (e) {
    console.error("Error generating PDF:", e);
    res.status(500).json({ 
      error: `Error generating PDF: ${e.message || String(e)}`,
      stack: process.env.NODE_ENV === 'development' ? e.stack : undefined
    });
  }
});

app.get("/", (req, res) => {
  console.log("Root endpoint accessed");
  res.json({ 
    message: "Case Report Generator API", 
    status: "running",
    endpoints: {
      health: "GET /health",
      generate: "POST /generate-report"
    }
  });
});

const PORT = process.env.PORT || 7860;
app.listen(PORT, "0.0.0.0", () => {
  console.log(`Server listening on port ${PORT}`);
  console.log(`Environment check:`);
});


// // server.js
// import fs from "fs";
// import path from "path";
// import crypto from "crypto";
// import fetch from "node-fetch";
// import express from "express";
// import bodyParser from "body-parser";
// import PDFDocument from "pdfkit";
// import sharp from "sharp";
// import moment from "moment-timezone";
// import cors from "cors";

// // Configuration (all from environment variables)
// const BASE_URL = process.env.BASE_URL || "https://rakshitjan-cps-b2c.hf.space";
// const ADMIN_EMAIL = process.env.ADMIN_EMAIL || "admin123@example.com";
// const ADMIN_PASSWORD = process.env.ADMIN_PASSWORD || "SecurePass123";
// const AES_KEY_STR = process.env.AES_KEY_STR || "7E892875A52C59A3B588306B13C31FBD";
// const AES_IV_STR = process.env.AES_IV_STR || "XYE45DKJ0967GFAZ";
// const GOOGLE_MAPS_API_KEY = process.env.GOOGLE_MAPS_API_KEY || "AIzaSyBpna0F0J-c9QNBh8lSnfT2Z2uzD_vS9Ag"; // For geocoding
// const GEOAPIFY_API_KEY = process.env.GEOAPIFY_API_KEY || "ceaea8a8a8f14f46b73221384eb4b5f0" ; // For static maps
// const LOGO_PATH = process.env.LOGO_PATH || "logo.png";

// // PDF compression settings
// const PDF_COMPRESSION_ENABLED = process.env.PDF_COMPRESSION_ENABLED !== "false";
// const IMAGE_COMPRESSION_QUALITY = parseInt(process.env.IMAGE_COMPRESSION_QUALITY) || 65;
// const MAX_IMAGE_DIMENSION = parseInt(process.env.MAX_IMAGE_DIMENSION) || 1200;
// const THUMBNAIL_QUALITY = parseInt(process.env.THUMBNAIL_QUALITY) || 55;

// const app = express();
// app.use(bodyParser.json({ limit: "50mb" }));

// // Allow ALL origins
// app.use(cors());

// // Utility: convert cm to PDF points (1 pt = 1/72 in; 1 cm = 28.3464567 pt)
// const CM = 28.3464567;
// const A4_WIDTH = 595.2755905511812; // points (210mm)
// const A4_HEIGHT = 841.8897637795277; // points (297mm)
// const MARGIN = 1.2 * CM;

// // AES encryption like Python's Crypto.Cipher AES-CBC w/ PKCS7 padding
// function aesEncrypt(plaintext, keyStr, ivStr) {
//   // Validate inputs
//   if (!plaintext) throw new Error("Plaintext is required for encryption");
//   if (!keyStr) throw new Error("AES key is required");
//   if (!ivStr) throw new Error("AES IV is required");
  
//   const key = Buffer.from(keyStr, "utf8");
//   const iv = Buffer.from(ivStr, "utf8");
  
//   // Validate key and IV lengths
//   if (key.length !== 16 && key.length !== 24 && key.length !== 32) {
//     throw new Error(`Invalid AES key length: ${key.length} bytes. Must be 16, 24, or 32 bytes.`);
//   }
  
//   // Node's createCipheriv uses PKCS#7 padding by default (called PKCS#5 in OpenSSL)
//   const cipher = crypto.createCipheriv(`aes-${key.length * 8}-cbc`, key, iv);
//   const encrypted = Buffer.concat([
//     cipher.update(Buffer.from(plaintext, "utf8")), 
//     cipher.final()
//   ]);
//   return encrypted.toString("base64");
// }

// // HTTP session mimic (we reuse fetch)
// let token = null;
// async function adminLogin() {
//   try {
//     // encrypt email same as python
//     const encryptedEmail = aesEncrypt(ADMIN_EMAIL, AES_KEY_STR, AES_IV_STR);
    
//     const payload = {
//       email: encryptedEmail,
//       password: ADMIN_PASSWORD
//     };
    
//     console.log(`Logging in to ${BASE_URL} with admin email...`);
    
//     const res = await fetch(`${BASE_URL}/api/admin/login`, {
//       method: "POST",
//       headers: { "Content-Type": "application/json" },
//       body: JSON.stringify(payload),
//       timeout: 30000
//     });
    
//     const data = await res.json();
    
//     if (res.status !== 200 || !data.token) {
//       console.error(`Login failed. Status: ${res.status}, Response:`, data);
//       throw new Error(`Login failed: ${JSON.stringify(data)}`);
//     }
    
//     token = data.token;
//     console.log("Admin login successful");
//     return token;
//   } catch (error) {
//     console.error("Admin login error:", error.message);
//     throw error;
//   }
// }

// async function getCase(caseId) {
//   if (!token) await adminLogin();
  
//   console.log(`Fetching case ${caseId}...`);
//   const res = await fetch(`${BASE_URL}/api/cases/${caseId}`, {
//     headers: { 
//       "Content-Type": "application/json", 
//       "Authorization": `Bearer ${token}` 
//     },
//     timeout: 30000
//   });
  
//   if (!res.ok) {
//     console.error(`Failed to get case ${caseId}: ${res.status} ${res.statusText}`);
//     throw new Error(`Failed get_case: ${res.status}`);
//   }
  
//   return await res.json();
// }

// async function getFiles(caseId) {
//   if (!token) await adminLogin();
  
//   console.log(`Fetching files for case ${caseId}...`);
//   const res = await fetch(`${BASE_URL}/api/cases/${caseId}/files`, {
//     headers: { 
//       "Content-Type": "application/json", 
//       "Authorization": `Bearer ${token}` 
//     },
//     timeout: 60000
//   });
  
//   if (!res.ok) {
//     console.error(`Failed to get files for case ${caseId}: ${res.status} ${res.statusText}`);
//     throw new Error(`Failed get_files: ${res.status}`);
//   }
  
//   const json = await res.json();
//   console.log(`Retrieved ${json.files?.length || 0} files for case ${caseId}`);
//   return json.files || [];
// }

// async function downloadFile(fileId) {
//   if (!token) await adminLogin();
  
//   console.log(`Downloading file ${fileId}...`);
//   const res = await fetch(`${BASE_URL}/api/files/${fileId}`, {
//     headers: { "Authorization": `Bearer ${token}` },
//     timeout: 60000
//   });
  
//   if (!res.ok) {
//     console.error(`File download failed for ${fileId}: ${res.status} ${res.statusText}`);
//     throw new Error(`File download failed for ${fileId}: ${res.status}`);
//   }
  
//   const buf = await res.arrayBuffer();
//   return Buffer.from(buf);
// }

// // Google Maps Geocoding API helpers (for forward/reverse geocoding)
// async function forwardGeocode(address) {
//   if (!address) {
//     console.log("No address provided for geocoding");
//     return [null, null];
//   }
  
//   if (!GOOGLE_MAPS_API_KEY) {
//     console.error("GOOGLE_MAPS_API_KEY is not set");
//     return [null, null];
//   }
  
//   console.log(`Geocoding address: ${address.substring(0, 50)}...`);
  
//   try {
//     const url = `https://maps.googleapis.com/maps/api/geocode/json?address=${encodeURIComponent(address)}&key=${GOOGLE_MAPS_API_KEY}`;
//     const res = await fetch(url, { timeout: 20000 });
    
//     if (!res.ok) {
//       console.error(`Geocoding API error: ${res.status} ${res.statusText}`);
//       return [null, null];
//     }
    
//     const json = await res.json();
    
//     if (json.status === "OK" && json.results && json.results[0] && json.results[0].geometry && json.results[0].geometry.location) {
//       const loc = json.results[0].geometry.location;
//       console.log(`Geocoding successful: ${loc.lat}, ${loc.lng}`);
//       return [loc.lat, loc.lng];
//     } else {
//       console.warn(`Geocoding failed: ${json.status} - ${json.error_message || 'No results'}`);
//       return [null, null];
//     }
//   } catch (error) {
//     console.error("Geocoding error:", error.message);
//     return [null, null];
//   }
// }

// async function reverseGeocode(lat, lon) {
//   if (lat == null || lon == null) {
//     console.log("No coordinates provided for reverse geocoding");
//     return "Unknown Address";
//   }
  
//   if (!GOOGLE_MAPS_API_KEY) {
//     console.error("GOOGLE_MAPS_API_KEY is not set");
//     return "Unknown Address";
//   }
  
//   console.log(`Reverse geocoding coordinates: ${lat}, ${lon}`);
  
//   try {
//     const url = `https://maps.googleapis.com/maps/api/geocode/json?latlng=${lat},${lon}&key=${GOOGLE_MAPS_API_KEY}`;
//     const res = await fetch(url, { timeout: 20000 });
    
//     if (!res.ok) {
//       console.error(`Reverse geocoding API error: ${res.status} ${res.statusText}`);
//       return "Unknown Address";
//     }
    
//     const json = await res.json();
    
//     if (json.status === "OK" && json.results && json.results[0] && json.results[0].formatted_address) {
//       const address = json.results[0].formatted_address;
//       console.log(`Reverse geocoding successful: ${address.substring(0, 50)}...`);
//       return address;
//     } else {
//       console.warn(`Reverse geocoding failed: ${json.status} - ${json.error_message || 'No results'}`);
//       return "Unknown Address";
//     }
//   } catch (error) {
//     console.error("Reverse geocoding error:", error.message);
//     return "Unknown Address";
//   }
// }

// // Geoapify Static Maps API (for static maps with markers and path)
// async function staticMapWithPath(captureLat, captureLng, caseLat = null, caseLng = null, zoom = 17, size = "1800x600") {
//   if (captureLat == null || captureLng == null) {
//     console.log("No capture coordinates provided for static map");
//     return null;
//   }
  
//   if (!GEOAPIFY_API_KEY) {
//     console.error("GEOAPIFY_API_KEY is not set");
//     return null;
//   }
  
//   console.log(`Generating static map for: ${captureLat}, ${captureLng}`);
  
//   try {
//     let parts = [
//       `center=lonlat:${captureLng},${captureLat}`,
//       `zoom=${zoom}`,
//       `size=${size}`,
//       `scaleFactor=2`,
//       `marker=lonlat:${captureLng},${captureLat};color:%23ff0000;size:large`
//     ];
    
//     if (caseLat != null && caseLng != null) {
//       parts.push(`marker=lonlat:${caseLng},${caseLat};color:%23007bff;size:large`);
//       parts.push(`path=color:%23ff0000;weight:4|lonlat:${caseLng},${caseLat}|lonlat:${captureLng},${captureLat}`);
//     }
    
//     const url = `https://maps.geoapify.com/v1/staticmap?${parts.join("&")}&apiKey=${GEOAPIFY_API_KEY}`;
//     const res = await fetch(url, { timeout: 30000 });
    
//     if (!res.ok) {
//       console.error(`Static map API error: ${res.status} ${res.statusText}`);
//       return null;
//     }
    
//     const buf = Buffer.from(await res.arrayBuffer());
//     console.log("Static map generated successfully");
//     return buf;
//   } catch (error) {
//     console.error("Static map generation error:", error.message);
//     return null;
//   }
// }

// function haversineKm(lat1, lon1, lat2, lon2) {
//   if ([lat1, lon1, lat2, lon2].some(v => v == null)) return null;
//   const R = 6371.0;
//   const phi1 = lat1 * Math.PI / 180;
//   const phi2 = lat2 * Math.PI / 180;
//   const dphi = (lat2 - lat1) * Math.PI / 180;
//   const dlambda = (lon2 - lon1) * Math.PI / 180;
//   const a = Math.sin(dphi / 2) * Math.sin(dphi / 2) + Math.cos(phi1) * Math.cos(phi2) * Math.sin(dlambda / 2) * Math.sin(dlambda / 2);
//   return 2 * R * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
// }

// // date formatting to IST similar to fmt_ist in python
// function fmtIST(dtStr) {
//   if (!dtStr) return "N/A";
//   try {
//     // Accept Z or offset
//     const m = moment(dtStr);
//     const ist = m.tz("Asia/Kolkata").format("DD/MM/YYYY hh:mm:ss A") + " IST";
//     return ist;
//   } catch {
//     return dtStr;
//   }
// }

// function exportedOnStr() {
//   return moment().tz("Asia/Kolkata").format("MMMM DD, YYYY");
// }

// // Mapping display names
// const DISPLAY_NAME = {
//   "aadhaar_photo": "Photo of Aadhar",
//   "customer_photo": "Customer's Photo",
//   "residence_photo": "Residence Photo",
//   "business_photo": "Business Address Photo"
// };
// function displayType(fileType) {
//   return DISPLAY_NAME[fileType] || fileType || "Upload";
// }

// // Optimized image compression - resize and compress aggressively
// async function compressImageBuffer(imageBuffer, quality = IMAGE_COMPRESSION_QUALITY, maxDimension = MAX_IMAGE_DIMENSION) {
//   try {
//     // Get image info
//     const image = sharp(imageBuffer);
//     const metadata = await image.metadata();
    
//     // Check if image is already small
//     if (imageBuffer.length < 100 * 1024) { // Less than 100KB
//       console.log(`Image already small (${Math.round(imageBuffer.length / 1024)}KB), skipping compression`);
//       return imageBuffer;
//     }
    
//     console.log(`Compressing image: ${Math.round(imageBuffer.length / 1024)}KB, ${metadata.width}x${metadata.height}`);
    
//     // Calculate new dimensions if needed
//     let newWidth = metadata.width;
//     let newHeight = metadata.height;
    
//     if (metadata.width > maxDimension || metadata.height > maxDimension) {
//       if (metadata.width > metadata.height) {
//         newWidth = maxDimension;
//         newHeight = Math.round((metadata.height / metadata.width) * maxDimension);
//       } else {
//         newHeight = maxDimension;
//         newWidth = Math.round((metadata.width / metadata.height) * maxDimension);
//       }
//       console.log(`Resizing image from ${metadata.width}x${metadata.height} to ${newWidth}x${newHeight}`);
//     }
    
//     // Use WebP for best compression (much better than JPEG for same quality)
//     const compressedBuffer = await sharp(imageBuffer)
//       .resize(newWidth, newHeight, {
//         fit: 'inside',
//         withoutEnlargement: true
//       })
//       .webp({ 
//         quality: Math.max(quality, 50), // Minimum 50% quality
//         effort: 6,  // Maximum compression effort (slowest but best)
//         lossless: false
//       })
//       .toBuffer()
//       .catch(async (webpError) => {
//         console.log(`WebP failed, using JPEG: ${webpError.message}`);
//         // Fallback to JPEG with mozjpeg for better compression
//         return await sharp(imageBuffer)
//           .resize(newWidth, newHeight, {
//             fit: 'inside',
//             withoutEnlargement: true
//           })
//           .flatten({ background: { r: 255, g: 255, b: 255 } }) // Remove transparency
//           .jpeg({ 
//             quality: Math.max(quality - 10, 40), // JPEG needs lower quality for similar size
//             mozjpeg: true,  // Better compression
//             chromaSubsampling: '4:4:4' // Better quality
//           })
//           .toBuffer();
//       });
    
//     const originalSize = imageBuffer.length;
//     const compressedSize = compressedBuffer.length;
//     const compressionRatio = ((originalSize - compressedSize) / originalSize * 100).toFixed(1);
    
//     console.log(`Image compressed: ${Math.round(originalSize / 1024)}KB → ${Math.round(compressedSize / 1024)}KB (${compressionRatio}% reduction)`);
    
//     return compressedBuffer;
//   } catch (error) {
//     console.error("Image compression error:", error.message);
//     // Return original buffer if compression fails
//     return imageBuffer;
//   }
// }

// // Optimized thumbnail creation with aggressive compression
// async function makeThumb(imgBuf, maxW = 860, maxH = 640) {
//   try {
//     // First compress and resize the image aggressively for thumbnails
//     const compressedImg = await compressImageBuffer(imgBuf, THUMBNAIL_QUALITY, Math.max(maxW, maxH));
    
//     // Create thumbnail with specific dimensions
//     const img = sharp(compressedImg)
//       .rotate()
//       .resize({ 
//         width: maxW, 
//         height: maxH, 
//         fit: "inside",
//         withoutEnlargement: true,
//         kernel: sharp.kernel.lanczos3 // Better downsampling
//       })
//       .flatten({ background: { r: 255, g: 255, b: 255 } });
    
//     // Use WebP for thumbnails
//     let outputBuffer;
//     try {
//       outputBuffer = await img
//         .webp({ 
//           quality: THUMBNAIL_QUALITY,
//           effort: 6,
//           lossless: false
//         })
//         .toBuffer();
//     } catch {
//       // Fallback to JPEG
//       outputBuffer = await img
//         .jpeg({ 
//           quality: THUMBNAIL_QUALITY - 10,
//           mozjpeg: true
//         })
//         .toBuffer();
//     }
    
//     // Add minimal border
//     const bordered = await sharp(outputBuffer)
//       .extend({ 
//         top: 1, 
//         bottom: 1, 
//         left: 1, 
//         right: 1, 
//         background: { r: 170, g: 170, b: 170 } 
//       });
    
//     let finalBuffer;
//     try {
//       finalBuffer = await bordered
//         .webp({ 
//           quality: THUMBNAIL_QUALITY,
//           effort: 6 
//         })
//         .toBuffer();
//     } catch {
//       finalBuffer = await bordered
//         .jpeg({ 
//           quality: THUMBNAIL_QUALITY - 10,
//           mozjpeg: true 
//         })
//         .toBuffer();
//     }
    
//     return finalBuffer;
//   } catch (error) {
//     console.error("Thumbnail creation error:", error.message);
//     // Return original if thumbnail creation fails
//     return await compressImageBuffer(imgBuf, THUMBNAIL_QUALITY);
//   }
// }

// // Compress static maps aggressively (maps don't need high quality)
// async function compressStaticMap(mapBuffer) {
//   if (!mapBuffer) return mapBuffer;
  
//   try {
//     const originalSize = mapBuffer.length;
    
//     // If already small, return as is
//     if (originalSize < 50 * 1024) {
//       return mapBuffer;
//     }
    
//     console.log(`Compressing static map: ${Math.round(originalSize / 1024)}KB`);
    
//     // Static maps can be heavily compressed
//     const compressedBuffer = await sharp(mapBuffer)
//       .webp({ 
//         quality: 50,  // Low quality for maps
//         effort: 6,
//         lossless: false
//       })
//       .toBuffer()
//       .catch(() => {
//         // Fallback to JPEG
//         return sharp(mapBuffer)
//           .jpeg({ 
//             quality: 55,
//             mozjpeg: true
//           })
//           .toBuffer();
//       });
    
//     const compressedSize = compressedBuffer.length;
//     const compressionRatio = ((originalSize - compressedSize) / originalSize * 100).toFixed(1);
    
//     console.log(`Static map compressed: ${Math.round(originalSize / 1024)}KB → ${Math.round(compressedSize / 1024)}KB (${compressionRatio}% reduction)`);
    
//     return compressedBuffer;
//   } catch (error) {
//     console.error("Static map compression error:", error.message);
//     return mapBuffer;
//   }
// }

// // Simple PDF optimization - we rely on image compression and PDFKit's built-in compression
// async function optimizePDF(inputPath, outputPath) {
//   if (!PDF_COMPRESSION_ENABLED) {
//     fs.copyFileSync(inputPath, outputPath);
//     return outputPath;
//   }
  
//   try {
//     // For Hugging Face, we can't use Ghostscript, so we rely on the compression
//     // we've already done at the image level and PDFKit's built-in compression
//     console.log("Using image-level compression (optimized for Hugging Face)");
    
//     // Just copy the file - compression was already done during creation
//     fs.copyFileSync(inputPath, outputPath);
    
//     return outputPath;
//   } catch (error) {
//     console.error("PDF optimization failed:", error.message);
//     // Fallback to original
//     fs.copyFileSync(inputPath, outputPath);
//     return outputPath;
//   }
// }

// // text wrapping helper that attempts to match Python's draw_wrapped_label_value.
// function drawWrappedLabelValue(doc, x, y, label, text, maxWidthCm = 16.0) {
//   const maxW = maxWidthCm * CM;
//   const fontSize = 10;
//   doc.font("Helvetica").fontSize(fontSize);
//   const labelStr = `${label}: `;
//   const labelW = doc.widthOfString(labelStr);
//   const words = (text || "N/A").toString().split(/\s+/);
//   let first = true;
//   let line = "";
//   let width = 0;
//   let lines = [];

//   for (let w of words) {
//     const w_w = doc.widthOfString(w + " ");
//     if (first) {
//       if (labelW + width + w_w < maxW) {
//         line += w + " ";
//         width += w_w;
//       } else {
//         lines.push(labelStr + line.trim());
//         first = false;
//         line = w + " ";
//         width = w_w;
//       }
//     } else {
//       if (width + w_w < maxW) {
//         line += w + " ";
//         width += w_w;
//       } else {
//         const indentText = " ".repeat(Math.max(0, Math.floor(labelW / (fontSize * 0.6))));
//         lines.push(indentText + line.trim());
//         line = w + " ";
//         width = w_w;
//       }
//     }
//   }
//   if (first) {
//     lines.push(labelStr + (line.trim()));
//   } else {
//     if (line) {
//       const indentText = " ".repeat(Math.max(0, Math.floor(labelW / (fontSize * 0.6))));
//       lines.push(indentText + line.trim());
//     }
//   }

//   for (let ln of lines) {
//     doc.text(ln, x, y, { lineBreak: false });
//     y += 0.45 * CM;
//   }
//   return y;
// }

// // Draw header/footer helpers
// function drawHeader(doc, title) {
//   // header blue rectangle at top: height 2.4 cm
//   doc.save();
//   doc.rect(0, 0, A4_WIDTH, 2.4 * CM).fill("#0F61A8");
//   // logo
//   let titleX = MARGIN;
//   if (fs.existsSync(LOGO_PATH)) {
//     try {
//       const logoBuffer = fs.readFileSync(LOGO_PATH);
//       doc.image(logoBuffer, MARGIN, 0.2 * CM, { width: 2.4 * CM, height: 2.0 * CM });
//       titleX = MARGIN + 2.6 * CM;
//     } catch (e) {
//       console.warn(`Could not load logo from ${LOGO_PATH}:`, e.message);
//     }
//   }
//   doc.fillColor("white").font("Helvetica-Bold").fontSize(15).text(title, titleX, 0.9 * CM, { continued: false });
//   doc.font("Helvetica").fontSize(10);
//   const exp = `Exported on ${exportedOnStr()}`;
//   const w = doc.widthOfString(exp);
//   doc.fillColor("white").text(exp, A4_WIDTH - MARGIN - w, 1.0 * CM);
//   doc.fillColor("black");
//   doc.restore();
// }

// function drawFooter(doc, page) {
//   doc.font("Helvetica").fontSize(9).text(`Page ${page}`, A4_WIDTH - MARGIN - 50, A4_HEIGHT - 1.0 * CM);
// }

// // Optimized Build PDF function
// async function buildPdf(caseObj, files, outPath) {
//   return new Promise(async (resolve, reject) => {
//     try {
//       console.log(`Building optimized PDF for case ${caseObj.case_id} with ${files.length} files...`);
      
//       const doc = new PDFDocument({ 
//         size: "A4", 
//         margin: 0,
//         compress: true,  // Enable PDF compression
//         pdfVersion: '1.5', // Better compression
//         info: {
//           Title: `Report for ${caseObj.case_applicant_name || ''}`,
//           Author: 'Case Report System',
//           Subject: 'Case Inspection Report',
//           Keywords: 'case,report,inspection',
//           Creator: 'PDFKit with Compression',
//           Producer: 'Hugging Face Optimized',
//           CreationDate: new Date()
//         }
//       });
      
//       const ws = fs.createWriteStream(outPath);
//       doc.pipe(ws);

//       let page = 1;
//       const ad = ((caseObj.demographic_details || {}).address_details) || {};
//       const caseAddr = `${ad.residential_address || ""}, ${ad.city || ""}, ${ad.state || ""} ${ad.pincode || ""}`.trim();
//       console.log(`Case address: ${caseAddr}`);
      
//       const [caseLat, caseLng] = await forwardGeocode(caseAddr);
//       if (caseLat && caseLng) {
//         console.log(`Case coordinates: ${caseLat}, ${caseLng}`);
//       }

//       const title = `Name : ${caseObj.case_applicant_name || ""}`;
//       drawHeader(doc, title);
//       let y = 3.4 * CM;

//       // Customer Details section
//       y = sectionTitle(doc, "Customer Details", MARGIN, y);
//       labelValue(doc, MARGIN, y, "Customer Name", caseObj.case_applicant_name); y += 0.6 * CM;
//       labelValue(doc, MARGIN, y, "Customer ID", caseObj.case_id); y += 0.6 * CM;
//       labelValue(doc, MARGIN, y, "Phone Number", caseObj.case_applicant_contact); y += 0.6 * CM;
//       const emailId = (caseObj.demographic_details || {}).contact_information && (caseObj.demographic_details.contact_information.email_id);
//       labelValue(doc, MARGIN, y, "Email", emailId); y += 0.6 * CM;
//       y = drawWrappedLabelValue(doc, MARGIN, y, "Customer Address", caseAddr, 18.0); y += 0.4 * CM;

//       // Inspection Summary
//       y = sectionTitle(doc, "Inspection Summary", MARGIN, y);
//       doc.font("Helvetica").fontSize(10);
//       doc.text(`Request Started: ${fmtIST(caseObj.created_at)}`, MARGIN, y); y += 0.5 * CM;
//       doc.text(`Total Uploads: ${files.length} uploads`, MARGIN, y); y += 0.5 * CM;
//       doc.text(`Status: ${caseObj.status}`, MARGIN, y); y += 0.5 * CM;
//       doc.text(`Priority: ${caseObj.priority}`, MARGIN, y); y += 0.7 * CM;

//       // render static map if caseLat present
//       if (caseLat) {
//         console.log("Generating and compressing overview map...");
//         const mapBuf = await staticMapWithPath(caseLat, caseLng, caseLat, caseLng, 12, "1200x400"); // Smaller size
//         if (mapBuf) {
//           const compressedMapBuf = await compressStaticMap(mapBuf);
//           const mapH = 8 * CM; // Smaller height
//           const mapW = A4_WIDTH - 2 * MARGIN;
//           doc.image(compressedMapBuf, MARGIN, y, { width: mapW, height: mapH });
//           y += mapH + 0.8 * CM;
//         }
//       }

//       drawFooter(doc, page);
//       doc.addPage(); page += 1;

//       // Page 2: thumbnails (limited to 6 for size)
//       drawHeader(doc, title);
//       y = 3.4 * CM;
//       doc.font("Helvetica-Bold").fontSize(14).text("Image Thumbnails", MARGIN, y);
//       y += 0.8 * CM;

//       const x0 = MARGIN;
//       const y0 = y;
//       const colW = (A4_WIDTH - 2 * MARGIN) / 3;
//       const rowH = 5.5 * CM; // Smaller row height

//       // Limit thumbnails to 6 max for file size
//       const maxThumbnails = Math.min(6, files.length);
//       for (let i = 0; i < maxThumbnails; ++i) {
//         const f = files[i];
//         console.log(`Creating optimized thumbnail for upload ${i+1}...`);
//         const imgBuf = await makeThumb(f._bin);
//         const col = i % 3;
//         const row = Math.floor(i / 3);
//         const xi = x0 + col * colW + 0.2 * CM;
//         const yi = y0 + row * rowH + 4.0 * CM; // Adjusted position
        
//         try {
//           doc.image(imgBuf, xi, yi, { width: colW - 0.8 * CM, height: 3.5 * CM }); // Smaller thumbnails
//         } catch (e) { 
//           console.warn(`Could not draw thumbnail ${i+1}:`, e.message);
//         }
//         doc.font("Helvetica").fontSize(8).text(`Upload ${i + 1} — ${displayType(f.file_type)}`, xi, yi - 0.3 * CM);
//       }

//       drawFooter(doc, page);
//       doc.addPage(); page += 1;

//       // Page 3: Demographic, Business, Financial
//       drawHeader(doc, title);
//       y = 3.4 * CM;
//       y = sectionTitle(doc, "Demographic Details", MARGIN, y);
//       const demo = caseObj.demographic_details || {};
//       const ci = demo.contact_information || {};
//       const pd = demo.personal_details || {};
//       labelValue(doc, MARGIN, y, "Aadhaar Photo Match", demo.aadhaar_photo_match); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Email ID", ci.email_id); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Mobile Number", ci.mobile_number); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Gender", pd.gender); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Education", pd.education); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Family Members", pd.number_of_family_members); y += 1.0 * CM;

//       y = sectionTitle(doc, "Business Details", MARGIN, y);
//       const bd = caseObj.business_details || {};
//       const ei = bd.enterprise_information || {};
//       const bld = bd.business_location_details || {};
//       const ba = bd.business_address || {};
//       labelValue(doc, MARGIN, y, "Enterprise Name", ei.enterprise_name); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Organization Type", ei.type_of_organization); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Business Location Type", bld.business_location); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Address", ba.address); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "City/District/State/Pincode", `${ba.city || ""}, ${ba.district || ""}, ${ba.state || ""} - ${ba.pincode || ""}`); y += 1.0 * CM;

//       y = sectionTitle(doc, "Financial Details", MARGIN, y);
//       const fin = caseObj.financial_details || {};
//       const bfi = fin.business_financial_information || {};
//       const ffi = fin.family_financial_information || {};
//       function fmtInr(v) {
//         try {
//           if (v == null || v === "" || isNaN(v)) return "N/A";
//           const amount = parseInt(v);
//           return `₹ ${amount.toLocaleString('en-IN')}`;
//         } catch {
//           return "N/A";
//         }
//       }
//       labelValue(doc, MARGIN, y, "Monthly Income", fmtInr(bfi.monthly_income_from_business)); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Monthly Expense", fmtInr(bfi.monthly_expense_of_business)); y += 0.5 * CM;
//       labelValue(doc, MARGIN, y, "Family Income", fmtInr(ffi.monthly_family_income)); y += 0.5 * CM;

//       drawFooter(doc, page);
//       doc.addPage(); page += 1;

//       // For each file, a detailed page (with aggressive image compression)
//       for (let idx = 0; idx < files.length; ++idx) {
//         const f = files[idx];
//         console.log(`Processing detailed page for upload ${idx+1}...`);
        
//         drawHeader(doc, title);
//         y = 3.4 * CM;
//         doc.font("Helvetica-Bold").fontSize(14).text(`Upload ${idx + 1} — ${displayType(f.file_type)}`, MARGIN, y);
//         y += 0.8 * CM;

//         // integrity_dashboard image (skip if not critical)
//         try {
//           const integrityPath = "integrity_dashboard.png";
//           if (fs.existsSync(integrityPath) && fs.statSync(integrityPath).size < 100 * 1024) {
//             const imageWidth = 16 * CM;
//             const imageHeight = 2.5 * CM;
//             const centerX = (A4_WIDTH - imageWidth) / 2;
//             doc.image(integrityPath, centerX, y, { width: imageWidth, height: imageHeight });
//             y = y + imageHeight + 0.8 * CM;
//           } else {
//             y += 0.5 * CM;
//           }
//         } catch (e) {
//           y += 0.5 * CM;
//         }

//         const gl = f.geo_location || {};
//         const lat = gl.lat;
//         const lng = gl.lng;

//         // Main image with aggressive compression
//         console.log(`Creating compressed main image for upload ${idx+1}...`);
//         const imgBuf = await compressImageBuffer(f._bin, IMAGE_COMPRESSION_QUALITY - 10, 1000);
//         try {
//           doc.image(imgBuf, MARGIN, y, { width: 8.0 * CM, height: 8.0 * CM }); // Smaller size
//         } catch (e) {
//           console.warn(`Could not draw main image ${idx+1}:`, e.message);
//         }

//         // Static map (only if coordinates exist)
//         if (lat != null && lng != null) {
//           console.log(`Generating compressed static map for upload ${idx+1}...`);
//           const mimgBuf = await staticMapWithPath(lat, lng, caseLat, caseLng, 17, "800x600"); // Smaller map
//           if (mimgBuf) {
//             const compressedMapBuf = await compressStaticMap(mimgBuf);
//             try {
//               doc.image(compressedMapBuf, 10.5 * CM, y, { width: 7.5 * CM, height: 7.5 * CM }); // Smaller
//             } catch (e) {
//               console.warn(`Could not draw static map ${idx+1}:`, e.message);
//             }
//           }
//         }

//         let yb = y + 9.0 * CM; // Adjusted for smaller images
        
//         // Reverse geocode
//         const rev = await reverseGeocode(lat, lng);
//         yb = drawWrappedLabelValue(doc, MARGIN, yb, "Location Address", rev, 18.0);

//         const distKm = (caseLat != null && lat != null) ? haversineKm(caseLat, caseLng, lat, lng) : null;
//         const distM = distKm ? Math.round(distKm * 1000) : null;
//         doc.font("Helvetica").fontSize(10);
//         doc.text(distM ? `Distance from case location: ${distM} meters` : "Distance from case location: N/A", MARGIN, yb);
//         yb += 0.7 * CM;

//         const upAt = fmtIST(f.uploaded_at);
//         doc.text(`Uploaded At: ${upAt}`, MARGIN, yb); yb += 0.8 * CM;

//         // Condensed metadata section
//         doc.font("Helvetica-Bold").fontSize(11).text("Metadata", MARGIN, yb); yb += 0.5 * CM;
//         doc.font("Helvetica").fontSize(9);
//         doc.text(`Server Time: ${upAt}`, MARGIN, yb); yb += 0.4 * CM;
//         if (lat != null) {
//           doc.text(`Location: ${lat.toFixed(4)}, ${lng.toFixed(4)}`, MARGIN, yb);
//         }
//         yb += 0.4 * CM;

//         drawFooter(doc, page);
        
//         // Only add new page if not the last file
//         if (idx < files.length - 1) {
//           doc.addPage(); 
//           page += 1;
//         }
//       }

//       // Timeline page (optional - can be skipped for very large reports)
//       if (files.length <= 10) { // Only add timeline for reasonable number of files
//         console.log("Creating timeline page...");
//         doc.addPage(); page += 1;
//         drawHeader(doc, title);
//         y = 3.4 * CM;
//         doc.font("Helvetica-Bold").fontSize(14).text("Inspection Timeline", MARGIN, y); y += 0.8 * CM;

//         doc.save();
//         doc.roundedRect(MARGIN, y, A4_WIDTH - 2 * MARGIN, 1.1 * CM, 0.3 * CM).fillOpacity(1).fill("#E0F7E6");
//         doc.fillColor("#1F743F").font("Helvetica-Bold").fontSize(12).text("Ready for Review", MARGIN + 0.6 * CM, y + 0.4 * CM);
//         doc.fillColor("black");
//         doc.restore();
//         y += 2.0 * CM;

//         const events = [];
//         function evt(text, ts, sub = null) {
//           if (ts) events.push({ text, ts, sub });
//         }
//         evt("Case Created", caseObj.created_at);
//         evt("Assigned to Agent", caseObj.assigned_at);
//         evt("Accepted by Agent", caseObj.accepted_at);
//         // Limit timeline events
//         for (let i = 0; i < Math.min(files.length, 5); i++) {
//           const f = files[i];
//           const sub = await reverseGeocode((f.geo_location || {}).lat, (f.geo_location || {}).lng);
//           evt(`Upload — ${displayType(f.file_type)}`, f.uploaded_at, sub);
//         }
//         evt("Case Updated", caseObj.updated_at);
//         evt("Case Completed", caseObj.completed_at);

//         function parseTs(s) {
//           try {
//             return new Date(s);
//           } catch {
//             return new Date(0);
//           }
//         }
//         events.sort((a, b) => parseTs(a.ts) - parseTs(b.ts));

//         for (let ev of events) {
//           doc.font("Helvetica").fontSize(9).text(`• ${fmtIST(ev.ts)}`, MARGIN, y); y += 0.4 * CM;
//           doc.font("Helvetica-Bold").fontSize(10).text(ev.text, MARGIN + 0.6 * CM, y); y += 0.4 * CM;
//           if (ev.sub) {
//             doc.font("Helvetica").fontSize(8).fillColor("gray");
//             const subText = ev.sub.length > 50 ? ev.sub.substring(0, 47) + "..." : ev.sub;
//             doc.text(`  ${subText}`, MARGIN + 0.6 * CM, y);
//             doc.fillColor("black");
//             y += 0.4 * CM;
//           }
//           y += 0.2 * CM;
//           if (y > A4_HEIGHT - 3 * CM) {
//             drawFooter(doc, page);
//             doc.addPage(); page += 1;
//             drawHeader(doc, title);
//             y = 3.4 * CM;
//             doc.font("Helvetica-Bold").fontSize(14).text("Inspection Timeline (Cont.)", MARGIN, y); y += 1.0 * CM;
//           }
//         }
//         drawFooter(doc, page);
//       }

//       doc.end();
      
//       ws.on("finish", () => {
//         console.log(`Optimized PDF created successfully at ${outPath}`);
//         resolve();
//       });
//       ws.on("error", (e) => {
//         console.error("PDF write stream error:", e);
//         reject(e);
//       });
//     } catch (e) {
//       console.error("PDF build error:", e);
//       reject(e);
//     }
//   });
// }

// // Helper functions
// function sectionTitle(doc, text, x, y) {
//   doc.font("Helvetica-Bold").fontSize(14).text(text, x, y);
//   return y + 0.9 * CM;
// }

// function labelValue(doc, x, y, label, value) {
//   doc.font("Helvetica-Bold").fontSize(10).text(`${label}:`, x, y);
//   doc.font("Helvetica").fontSize(10).text((value == null || value === "" || (Array.isArray(value) && value.length === 0)) ? "N/A" : value.toString(), x + 4.8 * CM, y);
// }

// // FastAPI-equivalent endpoints
// app.get("/health", (req, res) => {
//   console.log("Health check");
//   res.json({ 
//     status: "healthy",
//     env_loaded: !!ADMIN_EMAIL && !!ADMIN_PASSWORD && !!AES_KEY_STR && !!AES_IV_STR,
//     pdf_compression: {
//       enabled: PDF_COMPRESSION_ENABLED,
//       image_quality: IMAGE_COMPRESSION_QUALITY,
//       thumbnail_quality: THUMBNAIL_QUALITY,
//       max_image_dimension: MAX_IMAGE_DIMENSION
//     }
//   });
// });

// app.post("/generate-report", async (req, res) => {
//   console.log("Generate report request received");
  
//   try {
//     const caseId = (req.body || {}).case_id;
//     if (!caseId) {
//       console.error("Missing case_id in request");
//       return res.status(400).json({ error: "case_id required" });
//     }

//     console.log(`Generating optimized report for case: ${caseId}`);
    
//     await adminLogin();
//     const caseObj = await getCase(caseId);
//     const files = await getFiles(caseId);
    
//     console.log(`Downloading and compressing ${files.length} files...`);
//     // Download and immediately compress files
//     for (let i = 0; i < files.length; i++) {
//       console.log(`Processing file ${i+1}/${files.length}...`);
//       const originalBuffer = await downloadFile(files[i].file_id);
//       // Store compressed version
//       files[i]._bin = await compressImageBuffer(originalBuffer, IMAGE_COMPRESSION_QUALITY);
//     }

//     // Create output directory
//     const outDir = "/tmp/output";
//     if (!fs.existsSync(outDir)) {
//       console.log(`Creating output directory: ${outDir}`);
//       fs.mkdirSync(outDir, { recursive: true });
//     }
    
//     // Create temporary files
//     const timestamp = Date.now();
//     const originalFilename = `Report_${caseId}_${timestamp}.pdf`;
//     const optimizedFilename = `Report_${caseId}_${timestamp}_optimized.pdf`;
//     const originalPath = path.join(outDir, originalFilename);
//     const optimizedPath = path.join(outDir, optimizedFilename);
    
//     console.log(`Building optimized PDF at: ${originalPath}`);
//     await buildPdf(caseObj, files, originalPath);

//     // Optimize the PDF
//     console.log(`Optimizing PDF...`);
//     await optimizePDF(originalPath, optimizedPath);

//     // Read the optimized PDF
//     const pdfContent = fs.readFileSync(optimizedPath);
    
//     // Get file sizes for logging
//     const originalStats = fs.existsSync(originalPath) ? fs.statSync(originalPath) : { size: 0 };
//     const optimizedStats = fs.statSync(optimizedPath);
//     const compressionRatio = originalStats.size > 0 ? 
//       ((originalStats.size - optimizedStats.size) / originalStats.size * 100).toFixed(1) : "N/A";
    
//     console.log(`PDF optimization results:`);
//     console.log(`  Final size: ${Math.round(optimizedStats.size / 1024)}KB`);
//     if (originalStats.size > 0) {
//       console.log(`  Reduction: ${compressionRatio}% (from ${Math.round(originalStats.size / 1024)}KB)`);
//     }
    
//     // Cleanup
//     [originalPath, optimizedPath].forEach(filePath => {
//       try { 
//         if (fs.existsSync(filePath)) {
//           fs.unlinkSync(filePath); 
//           console.log(`Cleaned up: ${path.basename(filePath)}`);
//         }
//       } catch (e) { 
//         console.warn(`Could not delete ${filePath}:`, e.message);
//       }
//     });

//     const outputFilename = `Report_${caseId}.pdf`;
//     console.log(`Sending optimized PDF: ${outputFilename} (${Math.round(optimizedStats.size / 1024)}KB)`);
    
//     res.setHeader("Content-Type", "application/pdf");
//     res.setHeader("Content-Disposition", `attachment; filename="${outputFilename}"`);
//     res.setHeader("X-PDF-Size", `${Math.round(optimizedStats.size / 1024)}KB`);
//     res.setHeader("X-PDF-Compression", "Hugging Face Optimized");
//     res.send(pdfContent);
    
//     console.log("Optimized PDF sent successfully");
//   } catch (e) {
//     console.error("Error generating PDF:", e);
//     res.status(500).json({ 
//       error: `Error generating PDF: ${e.message || String(e)}`,
//       stack: process.env.NODE_ENV === 'development' ? e.stack : undefined
//     });
//   }
// });

// app.get("/", (req, res) => {
//   console.log("Root endpoint accessed");
//   res.json({ 
//     message: "Case Report Generator API (Hugging Face Optimized)", 
//     status: "running",
//     pdf_compression: {
//       enabled: PDF_COMPRESSION_ENABLED,
//       image_quality: IMAGE_COMPRESSION_QUALITY,
//       thumbnail_quality: THUMBNAIL_QUALITY,
//       max_image_dimension: MAX_IMAGE_DIMENSION,
//       note: "Optimized for Hugging Face Spaces - uses aggressive WebP compression"
//     },
//     endpoints: {
//       health: "GET /health",
//       generate: "POST /generate-report"
//     }
//   });
// });

// const PORT = process.env.PORT || 7860;
// app.listen(PORT, "0.0.0.0", () => {
//   console.log(`Server listening on port ${PORT}`);
//   console.log(`PDF Compression: ${PDF_COMPRESSION_ENABLED ? 'ENABLED' : 'DISABLED'}`);
//   console.log(`Image Quality: ${IMAGE_COMPRESSION_QUALITY}%`);
//   console.log(`Thumbnail Quality: ${THUMBNAIL_QUALITY}%`);
//   console.log(`Max Image Dimension: ${MAX_IMAGE_DIMENSION}px`);
//   console.log(`Optimized for Hugging Face Spaces`);
// });