/* Card Generator — frontend */

const $ = (id) => document.getElementById(id);
const preview = $("preview-frame");
const status = $("status");

let state = {
  eyebrow:   "RÉALISATION · SYMFONY",
  title:     "pokedwwmm",
  title_2:   "",
  tagline:   "151 Pokémon · Twig Components · JSON",
  accent:    "#ef4444",
  logo_color:"#ef4444",
  logo_kind: "preset",   // preset | upload | text | none
  logo_value:"symfony",
  logo_size: 260,
};

let renderTimer = null;
let logoLibrary = [];

/* ── Wire up form ──────────────────────────────────────────────── */

const inputBindings = {
  eyebrow: "eyebrow",
  title: "title",
  title_2: "title_2",
  tagline: "tagline",
  accent: "accent",
  logo_color: "logo_color",
};

for (const [stateKey, inputId] of Object.entries(inputBindings)) {
  $(inputId).addEventListener("input", (e) => {
    state[stateKey] = e.target.value;
    schedule();
  });
}

$("logo_size").addEventListener("input", (e) => {
  state.logo_size = +e.target.value;
  $("logo_size_val").value = `${state.logo_size}px`;
  schedule();
});

/* Swatches */
document.querySelectorAll(".swatch").forEach(btn => {
  const c = btn.dataset.color;
  btn.style.background = c;
  btn.addEventListener("click", () => {
    state.accent = c;
    state.logo_color = c;
    $("accent").value = c;
    $("logo_color").value = c;
    schedule();
  });
});

/* Segmented control: logo source */
document.querySelectorAll(".seg-btn").forEach(btn => {
  btn.addEventListener("click", () => {
    document.querySelectorAll(".seg-btn").forEach(b => b.classList.remove("active"));
    btn.classList.add("active");
    state.logo_kind = btn.dataset.kind;
    document.querySelectorAll(".logo-source").forEach(el => { el.hidden = true; });
    if (state.logo_kind === "preset")  document.querySelector(".preset-source").hidden = false;
    if (state.logo_kind === "upload")  document.querySelector(".upload-source").hidden = false;
    if (state.logo_kind === "text")    document.querySelector(".text-source").hidden = false;
    schedule();
  });
});

/* Text logo input */
$("logo_text").addEventListener("input", (e) => {
  if (state.logo_kind === "text") state.logo_value = e.target.value;
  schedule();
});

/* Upload */
$("logo_upload").addEventListener("change", async (e) => {
  const file = e.target.files[0];
  if (!file) return;
  const dataUrl = await new Promise((res, rej) => {
    const r = new FileReader();
    r.onload = () => res(r.result);
    r.onerror = rej;
    r.readAsDataURL(file);
  });
  state.logo_kind = "upload";
  state.logo_value = dataUrl;
  const preview = $("upload_preview");
  preview.hidden = false;
  preview.innerHTML = `<img src="${dataUrl}" alt="">`;
  schedule();
});

/* ── Logo library ──────────────────────────────────────────────── */

async function loadLogoLibrary() {
  const res = await fetch("/api/logos");
  logoLibrary = await res.json();
  const grid = $("logo_grid");
  grid.innerHTML = "";
  for (const slug of logoLibrary) {
    const tile = document.createElement("div");
    tile.className = "logo-tile";
    tile.title = slug;
    if (slug === state.logo_value) tile.classList.add("selected");
    tile.dataset.slug = slug;
    const svgRes = await fetch(`/logos/${slug}.svg`);
    tile.innerHTML = await svgRes.text();
    tile.addEventListener("click", () => {
      grid.querySelectorAll(".logo-tile").forEach(t => t.classList.remove("selected"));
      tile.classList.add("selected");
      state.logo_kind = "preset";
      state.logo_value = slug;
      // Also update segmented control
      document.querySelectorAll(".seg-btn").forEach(b =>
        b.classList.toggle("active", b.dataset.kind === "preset"));
      document.querySelectorAll(".logo-source").forEach(el => { el.hidden = true; });
      document.querySelector(".preset-source").hidden = false;
      schedule();
    });
    grid.appendChild(tile);
  }
}

/* ── Render pipeline ───────────────────────────────────────────── */

function schedule() {
  if (renderTimer) clearTimeout(renderTimer);
  status.textContent = "rendu…"; status.className = "status working";
  renderTimer = setTimeout(render, 120);
}

async function render() {
  try {
    const res = await fetch("/api/svg", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(state),
    });
    if (!res.ok) throw new Error(`HTTP ${res.status}`);
    const svgText = await res.text();
    preview.innerHTML = svgText;
    status.textContent = "à jour"; status.className = "status ok";
  } catch (e) {
    console.error(e);
    status.textContent = "erreur"; status.className = "status err";
  }
}

/* ── Download buttons ──────────────────────────────────────────── */

$("btn-svg").addEventListener("click", async () => {
  status.textContent = "génération SVG…"; status.className = "status working";
  const res = await fetch("/api/svg", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(state),
  });
  const blob = await res.blob();
  downloadBlob(blob, `${$("filename").value || "card"}.svg`);
  status.textContent = "SVG téléchargé"; status.className = "status ok";
});

$("btn-png").addEventListener("click", async () => {
  status.textContent = "rendu PNG (rsvg-convert)…"; status.className = "status working";
  const width = +$("export_width").value;
  const height = Math.round(width / 1.6);
  try {
    const res = await fetch("/api/png", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ ...state, export_width: width, export_height: height,
                             filename: $("filename").value || "card" }),
    });
    if (!res.ok) throw new Error(await res.text());
    const blob = await res.blob();
    downloadBlob(blob, `${$("filename").value || "card"}.png`);
    status.textContent = `PNG ${width}×${height} téléchargé`; status.className = "status ok";
  } catch (e) {
    console.error(e);
    status.textContent = "erreur PNG"; status.className = "status err";
  }
});

function downloadBlob(blob, filename) {
  const url = URL.createObjectURL(blob);
  const a = document.createElement("a");
  a.href = url; a.download = filename;
  document.body.appendChild(a); a.click(); a.remove();
  URL.revokeObjectURL(url);
}

/* ── Init ──────────────────────────────────────────────────────── */
loadLogoLibrary().then(render);