"use strict";

const $ = id => document.getElementById(id);

const sUpload        = $("s-upload");
const sProcessing    = $("s-processing");
const sResults       = $("s-results");
const dropZone       = $("drop-zone");
const fileInput      = $("file-input");
const browseBtn      = $("browse-btn");
const stepsList      = $("steps-list");
const roomsTbody     = $("rooms-tbody");
const resultsMeta    = $("results-meta");
const exportBtn      = $("export-btn");
const resetBtn       = $("reset-btn");
const examplesList   = $("examples-list");
const examplesForm   = $("examples-form");
const exampleInput   = $("example-input");

let jobId = null;
let rooms = [];
let examples = [];

// ── Examples management ───────────────────────────
async function loadDefaults() {
  try {
    const resp = await fetch("/api/defaults");
    const data = await resp.json();
    examples = Array.isArray(data.examples) ? data.examples : [];
    renderExamples();
  } catch (e) {
    console.warn("Could not load defaults:", e);
  }
}

function renderExamples() {
  examplesList.innerHTML = "";
  examples.forEach((ex, i) => {
    const chip = document.createElement("span");
    chip.className = "example-chip";
    chip.innerHTML = `
      ${esc(ex)}
      <button class="example-chip-remove" type="button" data-i="${i}" aria-label="Odebrat">
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5">
          <path stroke-linecap="round" stroke-linejoin="round" d="M6 18 18 6M6 6l12 12"/>
        </svg>
      </button>
    `;
    examplesList.appendChild(chip);
  });
  examplesList.querySelectorAll(".example-chip-remove").forEach(btn => {
    btn.addEventListener("click", () => {
      examples.splice(parseInt(btn.dataset.i, 10), 1);
      renderExamples();
    });
  });
}

examplesForm.addEventListener("submit", e => {
  e.preventDefault();
  const v = exampleInput.value.trim();
  if (!v) return;
  if (!/\d/.test(v)) {
    exampleInput.focus();
    exampleInput.select();
    return;
  }
  if (!examples.includes(v)) examples.push(v);
  exampleInput.value = "";
  renderExamples();
  exampleInput.focus();
});

// ── Drag & drop ───────────────────────────────────
dropZone.addEventListener("dragover",  e => { e.preventDefault(); dropZone.classList.add("drag-over"); });
dropZone.addEventListener("dragleave", () => dropZone.classList.remove("drag-over"));
dropZone.addEventListener("drop", e => {
  e.preventDefault();
  dropZone.classList.remove("drag-over");
  const f = e.dataTransfer.files[0];
  if (f) handleFile(f);
});
dropZone.addEventListener("click", () => fileInput.click());
browseBtn.addEventListener("click", e => { e.stopPropagation(); fileInput.click(); });
fileInput.addEventListener("change", e => { if (e.target.files[0]) handleFile(e.target.files[0]); });

// ── Upload & process ──────────────────────────────
async function handleFile(file) {
  const ext = file.name.split(".").pop().toLowerCase();
  if (!["dwg", "dxf"].includes(ext)) {
    alert("Podporované formáty jsou .dwg a .dxf");
    return;
  }

  show(sProcessing); hide(sUpload); hide(sResults);
  stepsList.innerHTML = "";
  addStep("Nahrávání souboru…", "active");

  const fd = new FormData();
  fd.append("file", file);
  fd.append("examples", JSON.stringify(examples));

  try {
    const resp = await fetch("/api/upload", { method: "POST", body: fd });
    if (!resp.ok) {
      const err = await resp.json().catch(() => ({}));
      throw new Error(err.detail || `HTTP ${resp.status}`);
    }
    const data = await resp.json();
    jobId = data.job_id;

    stepsList.innerHTML = "";
    for (const step of data.steps) addStep(step, "done");

    const rResp = await fetch(`/api/rooms/${jobId}`);
    rooms = await rResp.json();
    renderResults();
  } catch (err) {
    stepsList.innerHTML = "";
    addStep(`Chyba: ${err.message}`, "error");
    setTimeout(() => { show(sUpload); hide(sProcessing); }, 4000);
  }
}

function addStep(label, state) {
  const el = document.createElement("div");
  el.className = `step-item ${state}`;
  el.innerHTML = `<span class="step-dot"></span>${esc(label)}`;
  stepsList.appendChild(el);
}

// ── Render table ──────────────────────────────────
function renderResults() {
  hide(sProcessing); show(sResults);

  const total    = rooms.length;
  const llmCount = rooms.filter(r => r.source === "llm").length;
  resultsMeta.textContent = `${total} místností nalezeno${llmCount ? ` (${llmCount} z AI)` : ""}`;

  roomsTbody.innerHTML = "";
  const sorted = [...rooms].sort((a, b) => String(a.room).localeCompare(String(b.room)));

  sorted.forEach((room, i) => {
    const tr = document.createElement("tr");
    const pct = Math.round((room.confidence ?? 1) * 100);
    const badgeCls = room.source === "llm" ? "badge-llm" : "badge-rule";
    const badgeTxt = room.source === "llm" ? "AI" : "Pravidla";

    tr.innerHTML = `
      <td contenteditable="true" data-field="room" data-i="${i}">${esc(room.room)}</td>
      <td contenteditable="true" data-field="description" data-i="${i}">${esc(room.description)}</td>
      <td><span class="badge ${badgeCls}">${badgeTxt}</span></td>
      <td>${pct} %</td>
    `;

    tr.querySelectorAll("[contenteditable]").forEach(cell => {
      cell.addEventListener("blur", () => {
        const idx = parseInt(cell.dataset.i, 10);
        const field = cell.dataset.field;
        rooms[idx][field] = cell.textContent.trim();
      });
      cell.addEventListener("keydown", e => {
        if (e.key === "Enter") { e.preventDefault(); cell.blur(); }
      });
    });

    roomsTbody.appendChild(tr);
  });
}

// ── Export ────────────────────────────────────────
exportBtn.addEventListener("click", async () => {
  exportBtn.disabled = true;
  exportBtn.textContent = "Ukládám…";
  try {
    await fetch(`/api/rooms/${jobId}`, {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(rooms),
    });
    window.location.href = `/api/export/${jobId}`;
  } finally {
    setTimeout(() => {
      exportBtn.disabled = false;
      exportBtn.innerHTML = `<svg class="btn-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
        <path stroke-linecap="round" stroke-linejoin="round" d="M12 4.5v12m0 0-3.75-3.75M12 16.5l3.75-3.75M4.5 19.5h15"/>
      </svg>Exportovat Excel`;
    }, 1500);
  }
});

// ── Reset ─────────────────────────────────────────
resetBtn.addEventListener("click", () => {
  jobId = null; rooms = [];
  fileInput.value = "";
  stepsList.innerHTML = ""; roomsTbody.innerHTML = "";
  show(sUpload); hide(sResults); hide(sProcessing);
});

// ── Helpers ───────────────────────────────────────
function show(el) { el.classList.remove("hidden"); }
function hide(el) { el.classList.add("hidden"); }
function esc(s) {
  return String(s ?? "")
    .replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
}

// ── Init ──────────────────────────────────────────
loadDefaults();