"use strict";

const form          = document.getElementById("fetchForm");
const fetchBtn      = document.getElementById("fetchBtn");
const cardsContainer = document.getElementById("cardsContainer");

// Remove empty state on first card
function clearEmpty() {
  const empty = cardsContainer.querySelector(".empty-state");
  if (empty) empty.remove();
}

// ── Create a new VIN card ──────────────────────────────────────────────────────
function createCard(vin) {
  clearEmpty();

  const safeVin = vin.replace(/[^A-Z0-9]/g, "");

  const card = document.createElement("div");
  card.className = "vin-card";
  card.id = `card-${safeVin}`;

  // Build DOM without innerHTML interpolation to prevent XSS
  const header = document.createElement("div");
  header.className = "card-header";

  const headerLeft = document.createElement("div");

  const vinEl = document.createElement("div");
  vinEl.className = "card-vin";
  vinEl.textContent = safeVin;

  const vehicleEl = document.createElement("div");
  vehicleEl.className = "card-vehicle";
  vehicleEl.id = `vehicle-${safeVin}`;
  vehicleEl.textContent = "Consultando...";

  headerLeft.appendChild(vinEl);
  headerLeft.appendChild(vehicleEl);

  const dismissBtn = document.createElement("button");
  dismissBtn.className = "card-dismiss";
  dismissBtn.title = "Cerrar";
  dismissBtn.textContent = "✕";
  dismissBtn.addEventListener("click", () => card.remove());

  header.appendChild(headerLeft);
  header.appendChild(dismissBtn);

  const body = document.createElement("div");
  body.className = "card-body";

  const logEl = document.createElement("div");
  logEl.className = "progress-log";
  logEl.id = `log-${safeVin}`;

  const actionsEl = document.createElement("div");
  actionsEl.id = `actions-${safeVin}`;

  body.appendChild(logEl);
  body.appendChild(actionsEl);

  card.appendChild(header);
  card.appendChild(body);

  cardsContainer.prepend(card);
  return card;
}

// ── Add a log line to a card ───────────────────────────────────────────────────
function addLog(vin, text, status) {
  const log = document.getElementById(`log-${vin}`);
  if (!log) return;

  // Remove spinner from any previous progress item
  if (status !== "progress") {
    const prev = log.querySelector(".log-item.progress");
    if (prev) prev.classList.replace("progress", "done");
  }

  const item = document.createElement("div");
  item.className = `log-item ${status}`;

  if (status === "progress") {
    item.innerHTML = `<span class="spinner"></span><span>${text}</span>`;
  } else {
    item.textContent = text;
  }

  log.appendChild(item);
  item.scrollIntoView({ behavior: "smooth", block: "nearest" });
}

// ── Show card actions after fetch completes ───────────────────────────────────
function showActions(vin, risk) {
  const actionsDiv = document.getElementById(`actions-${vin}`);
  if (!actionsDiv) return;

  // Risk badge
  const badge = document.createElement("div");
  badge.className = `risk-badge ${risk.color}`;
  badge.textContent = `${risk.emoji} ${risk.score}/100 — ${risk.level}`;
  actionsDiv.appendChild(badge);

  // Buttons row
  const row = document.createElement("div");
  row.className = "card-actions";

  const genBtn = document.createElement("button");
  genBtn.className = "btn btn-gen";
  genBtn.textContent = "📄 Generar PDF";
  genBtn.addEventListener("click", () => generatePDF(vin, genBtn));

  row.appendChild(genBtn);
  actionsDiv.appendChild(row);
}

// ── Generate PDF ──────────────────────────────────────────────────────────────
async function generatePDF(vin, btn) {
  btn.disabled = true;
  btn.textContent = "⏳ Generando...";

  try {
    const res  = await fetch("/api/generate", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ vin }),
    });
    const data = await res.json();

    if (data.error) {
      btn.disabled = false;
      btn.textContent = "📄 Generar PDF";
      addLog(vin, `❌ ${data.error}`, "error");
      return;
    }

    btn.textContent = "✅ PDF listo";

    const actionsDiv = document.getElementById(`actions-${vin}`);

    // Download link
    const link = document.createElement("a");
    link.href = data.url;
    link.download = data.filename;
    link.className = "pdf-link";
    link.textContent = `⬇️ ${data.filename}`;
    actionsDiv.appendChild(link);

    // Open locally button (Windows only via server)
    const openBtn = document.createElement("button");
    openBtn.className = "btn btn-open";
    openBtn.textContent = "🗂️ Abrir localmente";
    openBtn.addEventListener("click", () => openLocally(data.filename, openBtn));
    actionsDiv.querySelector(".card-actions").appendChild(openBtn);

    addLog(vin, `✅ PDF generado: ${data.filename}`, "success");

  } catch (e) {
    btn.disabled = false;
    btn.textContent = "📄 Generar PDF";
    addLog(vin, `❌ Error al generar PDF: ${e.message}`, "error");
  }
}

// ── Open file locally via server ──────────────────────────────────────────────
async function openLocally(filename, btn) {
  btn.disabled = true;
  try {
    const res  = await fetch("/api/open", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ filename }),
    });
    const data = await res.json();
    if (data.error) {
      alert(data.error);
    }
  } catch (e) {
    alert("Error al abrir: " + e.message);
  } finally {
    btn.disabled = false;
  }
}

// ── Form submission → SSE ──────────────────────────────────────────────────────
form.addEventListener("submit", async (e) => {
  e.preventDefault();

  const fd = new FormData(form);
  const vin = (fd.get("vin") || "").trim().toUpperCase();
  if (!vin) return;

  // Prevent duplicate active cards
  const existing = document.getElementById(`card-${vin}`);
  if (existing) {
    existing.scrollIntoView({ behavior: "smooth" });
    existing.style.outline = "2px solid var(--accent)";
    setTimeout(() => (existing.style.outline = ""), 1500);
    return;
  }

  fetchBtn.disabled = true;
  fetchBtn.textContent = "⏳ Consultando...";

  createCard(vin);

  const params = new URLSearchParams({
    vin,
    odometer:         fd.get("odometer")         || "",
    primary_damage:   fd.get("primary_damage")   || "",
    secondary_damage: fd.get("secondary_damage") || "",
    title:            fd.get("title")            || "",
    bid:              fd.get("bid")              || "",
    auction:          fd.get("auction")          || "",
    photo_url:        fd.get("photo_url")        || "",
  });

  const es = new EventSource(`/api/fetch?${params.toString()}`);

  es.onmessage = (event) => {
    let msg;
    try { msg = JSON.parse(event.data); } catch { return; }

    const status = msg.status || "progress";

    if (status === "done") {
      const vehicleEl = document.getElementById(`vehicle-${vin}`);
      if (vehicleEl && msg.vehicle) vehicleEl.textContent = msg.vehicle;
      showActions(vin, msg.risk);
      es.close();
      fetchBtn.disabled = false;
      fetchBtn.textContent = "⚡ FETCH DATA";
      return;
    }

    if (status === "error") {
      addLog(vin, msg.step, "error");
      es.close();
      fetchBtn.disabled = false;
      fetchBtn.textContent = "⚡ FETCH DATA";
      return;
    }

    if (status === "success" && msg.vehicle) {
      const vehicleEl = document.getElementById(`vehicle-${vin}`);
      if (vehicleEl) vehicleEl.textContent = msg.vehicle;
    }

    addLog(vin, msg.step, status);
  };

  es.onerror = () => {
    addLog(vin, "❌ Conexión interrumpida con el servidor", "error");
    es.close();
    fetchBtn.disabled = false;
    fetchBtn.textContent = "⚡ FETCH DATA";
  };
});