/**
 * DeepShield AI — script.js (SupCon SOTA Version)
 */
const API_URL = ""; 

async function checkServerStatus() {
  const statusMenu = document.getElementById("server-status");
  const statusText = document.getElementById("status-text");
  const dropZone = document.getElementById("drop-zone");

  if (!statusMenu) return;

  try {
    const res = await fetch(`${API_URL}/health`);
    if (!res.ok) throw new Error("Server not OK");
    const data = await res.json();

    statusMenu.className = "server-status";

    if (data.model_loaded === true) {
      statusMenu.classList.add("status-connected");
      statusText.textContent = "AI Ready ✓";
      dropZone.style.pointerEvents = "auto";
      dropZone.style.opacity = "1";
      document.querySelector(".drop-title").innerHTML = "Drop your video or photo here";
    } else {
      statusMenu.classList.add("status-error");
      statusText.textContent = "Model Missing";
      dropZone.style.pointerEvents = "none";
      dropZone.style.opacity = "0.5";
      document.querySelector(".drop-title").innerHTML = "⚠️ Model Not Uploaded";
      document.querySelector(".drop-sub").textContent = "Upload best_model.pth from scripts3.";
    }
  } catch (err) {
    statusMenu.className = "server-status status-error";
    statusText.textContent = "Starting Server...";
    dropZone.style.pointerEvents = "none";
    dropZone.style.opacity = "0.5";
  }
}

checkServerStatus();
setInterval(checkServerStatus, 10000);

const MAX_FILE_MB = 30;
const MAX_FILE_BYTES = MAX_FILE_MB * 1024 * 1024;
let currentFile = null;

function showSection(id) {
  ["upload-section", "loading-section", "results-section", "error-section"].forEach(s => {
    document.getElementById(s).classList.toggle("hidden", s !== id);
  });
}

function onDragOver(e) { e.preventDefault(); document.getElementById("drop-zone").classList.add("dragging"); }
function onDragLeave() { document.getElementById("drop-zone").classList.remove("dragging"); }

function onDrop(e) {
  e.preventDefault();
  document.getElementById("drop-zone").classList.remove("dragging");
  const file = e.dataTransfer?.files?.[0];
  if (file) processFile(file);
}

function onFileSelected(e) {
  const file = e.target.files?.[0];
  if (file) processFile(file);
}

function processFile(file) {
  const allowedExt = [".mp4", ".mov", ".avi", ".mkv", ".jpg", ".jpeg", ".png", ".webp"];
  const ext = "." + file.name.split(".").pop().toLowerCase();
  
  if (!allowedExt.includes(ext)) {
    showError(`❌ Unsupported file type. Use Video (MP4/MOV/AVI) or Photo (JPG/PNG).`);
    return;
  }
  if (file.size > MAX_FILE_BYTES) {
    showError(`❌ File too large. Max: ${MAX_FILE_MB} MB.`);
    return;
  }

  currentFile = file;
  document.getElementById("file-name").textContent = file.name;
  document.getElementById("file-size").textContent = (file.size / (1024*1024)).toFixed(1) + " MB";

  const url = URL.createObjectURL(file);
  const isVideo = [".mp4", ".mov", ".avi", ".mkv"].includes(ext);

  const videoPrev = document.getElementById("video-preview");
  const videoCont = document.getElementById("video-container");
  
  // Check if image-preview element exists, if not create it
  let imgPrev = document.getElementById("image-preview");
  if (!imgPrev) {
    imgPrev = document.createElement("img");
    imgPrev.id = "image-preview";
    imgPrev.className = "video-preview"; // reuse styling
    videoCont.appendChild(imgPrev);
  }

  if (isVideo) {
    videoPrev.src = url;
    videoPrev.style.display = "block";
    imgPrev.style.display = "none";
  } else {
    videoPrev.style.display = "none";
    imgPrev.src = url;
    imgPrev.style.display = "block";
  }

  document.getElementById("drop-zone").classList.add("hidden");
  document.getElementById("file-preview").classList.remove("hidden");
}

function resetUpload() {
  currentFile = null;
  document.getElementById("file-input").value = "";
  showSection("upload-section");
  document.getElementById("drop-zone").classList.remove("hidden");
  document.getElementById("file-preview").classList.add("hidden");
  document.getElementById("ring-fill").style.strokeDashoffset = "314";
}

async function analyzeVideo() {
  if (!currentFile) return;
  showSection("loading-section");

  const formData = new FormData();
  formData.append("file", currentFile);

  try {
    const res = await fetch(`${API_URL}/predict`, { method: "POST", body: formData });
    if (!res.ok) throw new Error("Analysis failed on server.");
    const data = await res.json();
    renderResults(data);
    showSection("results-section");
  } catch (err) {
    showError(err.message);
  }
}

function renderResults(data) {
  const isFake = data.verdict === "FAKE";
  const fakePct = data.fake_probability;

  document.getElementById("verdict-card").className = "verdict-card " + (isFake ? "is-fake" : "is-real");
  document.getElementById("verdict-pct").textContent = `${fakePct}%`;
  document.getElementById("verdict-label").textContent = data.verdict;
  document.getElementById("verdict-badge").textContent = isFake ? "⚠ FAKE DETECTED" : "✅ REAL CONTENT";
  document.getElementById("verdict-badge").className = "verdict-badge " + (isFake ? "fake" : "real");

  const ring = document.getElementById("ring-fill");
  ring.style.stroke = isFake ? "#ef4444" : "#22c55e";
  ring.style.strokeDashoffset = 314 - (fakePct / 100) * 314;

  document.getElementById("stat-fake").textContent = `${fakePct}%`;
  document.getElementById("stat-real").textContent = `${data.real_probability}%`;
  document.getElementById("stat-frames").textContent = data.frame_count;
  document.getElementById("stat-size").textContent = data.file_size_mb + " MB";
  
  renderFrameChart(data.per_frame_scores || []);
}

function renderFrameChart(scores) {
  const container = document.getElementById("frame-chart");
  container.innerHTML = "";
  scores.forEach((s, i) => {
    const bar = document.createElement("div");
    bar.className = "bar-wrap";
    bar.innerHTML = `<div class="bar ${s > 50 ? 'bar-fake' : 'bar-real'}" style="height:${s}%"></div>`;
    container.appendChild(bar);
  });
}

function showError(msg) {
  document.getElementById("error-msg").textContent = msg;
  showSection("error-section");
}