import { Router, Response } from "express";
import { db } from "@workspace/db";
import { clientsTable, weeklyReportsTable } from "@workspace/db";
import { eq } from "drizzle-orm";
import { requireAuth, AuthRequest } from "../middleware/auth.js";
import { User, isAdmin } from "../lib/auth-utils.js";
import { logAudit } from "../lib/audit-logger.js";
import multer from "multer";
import { createClient } from "@supabase/supabase-js";
import crypto from "crypto";

const router = Router();

// Setup Supabase
const supabaseUrl = process.env.SUPABASE_URL!;
const supabaseKey = process.env.SUPABASE_SERVICE_ROLE_KEY || process.env.SUPABASE_KEY!;
const supabase = createClient(supabaseUrl, supabaseKey);

// Multer config for PDF only, max 10MB
const upload = multer({
  storage: multer.memoryStorage(),
  limits: {
    fileSize: 10 * 1024 * 1024, // 10MB
  },
  fileFilter: (_req, file, cb) => {
    if (file.mimetype === "application/pdf") {
      cb(null, true);
    } else {
      cb(new Error("Only PDF files are allowed"));
    }
  },
});

// GET /clients/:id/weekly-reports
router.get("/clients/:id/weekly-reports", requireAuth, async (req: AuthRequest, res: Response): Promise<void> => {
  try {
    const clientId = Number(req.params.id);

    const [client] = await db.select().from(clientsTable).where(eq(clientsTable.id, clientId));
    if (!client) {
      res.status(404).json({ error: "العميل غير موجود" });
      return;
    }

    const reports = await db
      .select()
      .from(weeklyReportsTable)
      .where(eq(weeklyReportsTable.clientId, clientId))
      .orderBy(weeklyReportsTable.createdAt);

    res.json(reports.map(report => ({
      ...report,
      createdAt: report.createdAt.toISOString()
    })));
  } catch (err: any) {
    console.error("Error fetching weekly reports:", err);
    res.status(500).json({ error: "حدث خطأ أثناء جلب التقارير الأسبوعية" });
  }
});

// POST /clients/:id/weekly-reports
router.post("/clients/:id/weekly-reports", requireAuth, upload.single("file"), async (req: AuthRequest, res: Response): Promise<void> => {
  try {
    const clientId = Number(req.params.id);
    const user = req.user as User & { supabaseUid?: string };
    const file = req.file;

    if (!file) {
      res.status(400).json({ error: "الرجاء إرفاق ملف PDF" });
      return;
    }

    const [client] = await db.select().from(clientsTable).where(eq(clientsTable.id, clientId));
    if (!client) {
      res.status(404).json({ error: "العميل غير موجود" });
      return;
    }

    // Upload to Supabase Storage
    const fileExt = file.originalname.split(".").pop();
    const uniqueId = crypto.randomUUID();
    const storagePath = `clients/${clientId}/${uniqueId}.${fileExt}`;

    const { error: uploadError } = await supabase.storage
      .from("weekly-reports")
      .upload(storagePath, file.buffer, {
        contentType: file.mimetype,
        upsert: false,
      });

    if (uploadError) {
      console.error("Supabase upload error:", uploadError);
      res.status(500).json({ error: "فشل رفع الملف إلى التخزين السحابي" });
      return;
    }

    const [report] = await db.insert(weeklyReportsTable).values({
      clientId,
      fileName: file.originalname,
      fileUrl: storagePath,
      fileSize: file.size,
      mimeType: file.mimetype,
      uploadedByUserId: user.id,
    }).returning();

    // Audit log
    await logAudit({
      userId: String(user.id),
      action: "weekly_report_uploaded",
      entityType: "client",
      entityId: clientId,
      details: {
        reportId: report.id,
        fileName: report.fileName,
        supabaseUid: user.supabaseUid ?? null,
      },
      req,
    });

    res.status(201).json({
      ...report,
      createdAt: report.createdAt.toISOString(),
    });
  } catch (err: any) {
    console.error("Error uploading weekly report:", err);
    res.status(500).json({ error: err.message || "حدث خطأ أثناء رفع التقرير" });
  }
});

// DELETE /clients/:id/weekly-reports/:reportId
router.delete("/clients/:id/weekly-reports/:reportId", requireAuth, async (req: AuthRequest, res: Response): Promise<void> => {
  try {
    const clientId = Number(req.params.id);
    const reportId = Number(req.params.reportId);
    const user = req.user as User & { supabaseUid?: string };

    const [report] = await db.select().from(weeklyReportsTable).where(eq(weeklyReportsTable.id, reportId));
    if (!report) {
      res.status(404).json({ error: "التقرير غير موجود" });
      return;
    }

    if (report.clientId !== clientId) {
      res.status(400).json({ error: "التقرير لا ينتمي لهذا العميل" });
      return;
    }

    const isUploader = report.uploadedByUserId === user.id;
    const isUserAdmin = isAdmin(user);

    if (!isUploader && !isUserAdmin) {
      res.status(403).json({ error: "غير مصرح لك بحذف هذا التقرير" });
      return;
    }

    // Delete from Supabase Storage
    try {
      await supabase.storage.from("weekly-reports").remove([report.fileUrl]);
    } catch (storageErr) {
      console.warn("Storage deletion warning (continuing DB deletion):", storageErr);
    }

    // Delete from DB
    await db.delete(weeklyReportsTable).where(eq(weeklyReportsTable.id, reportId));

    // Audit log
    await logAudit({
      userId: String(user.id),
      action: "weekly_report_deleted",
      entityType: "client",
      entityId: clientId,
      details: {
        reportId,
        fileName: report.fileName,
        supabaseUid: user.supabaseUid ?? null,
      },
      req,
    });

    res.json({ success: true });
  } catch (err: any) {
    console.error("Error deleting weekly report:", err);
    res.status(500).json({ error: "حدث خطأ أثناء حذف التقرير" });
  }
});

// GET /clients/:id/weekly-reports/:reportId/download — returns a signed URL (1 hour)
router.get("/clients/:id/weekly-reports/:reportId/download", requireAuth, async (req: AuthRequest, res: Response): Promise<void> => {
  try {
    const reportId = Number(req.params.reportId);
    const [report] = await db.select().from(weeklyReportsTable).where(eq(weeklyReportsTable.id, reportId));
    if (!report) {
      res.status(404).json({ error: "التقرير غير موجود" });
      return;
    }

    const { data, error } = await supabase.storage
      .from("weekly-reports")
      .createSignedUrl(report.fileUrl, 3600); // 1 hour

    if (error || !data) {
      console.error("Signed URL generation error:", error);
      res.status(500).json({ error: "فشل إنشاء رابط التحميل" });
      return;
    }

    res.json({ signedUrl: data.signedUrl });
  } catch (err: any) {
    console.error("Error generating signed URL:", err);
    res.status(500).json({ error: "حدث خطأ أثناء تحميل التقرير" });
  }
});

export default router;