const fields = {
  text: document.getElementById("mobileText"),
  tape: document.getElementById("mobileTape"),
  margin: document.getElementById("mobileMargin"),
  font: document.getElementById("mobileFont"),
  copies: document.getElementById("mobileCopies"),
  align: document.getElementById("mobileAlign"),
  bold: document.getElementById("mobileBold"),
  frame: document.getElementById("mobileFrame"),
  tapeInfo: document.getElementById("mobileTapeInfo"),
  tapeInfoType: document.getElementById("mobileTapeInfoType"),
  tapePrintableWidth: document.getElementById("mobileTapePrintableWidth"),
  tapeBgSwatch: document.getElementById("mobileTapeBgSwatch"),
  tapeBgText: document.getElementById("mobileTapeBgText"),
  tapeTextSwatch: document.getElementById("mobileTapeTextSwatch"),
  tapeTextText: document.getElementById("mobileTapeTextText"),
  preview: document.getElementById("mobilePreview"),
  message: document.getElementById("mobileMessage"),
};

const steppers = {
  mobileCopies: { input: fields.copies, output: document.getElementById("mobileCopiesValue"), min: 1, max: 20, step: 1, suffix: "" },
  mobileFont: { input: fields.font, output: document.getElementById("mobileFontValue"), min: 2, max: 24, step: 0.5, suffix: " mm" },
  mobileMargin: { input: fields.margin, output: document.getElementById("mobileMarginValue"), min: 0, max: 20, step: 0.5, suffix: " mm" },
};

function estimateTextLengthMm(text, fontSize, margin, frame) {
  const lines = String(text || " ").split("\n");
  const longest = lines.reduce((max, line) => Math.max(max, line.length), 0);
  const textWidth = Math.max(8, longest * fontSize * 0.62);
  return Math.min(300, Math.max(20, Math.ceil(textWidth + margin * 2 + (frame ? 4 : 0))));
}

function clamp(value, min, max) {
  return Math.min(max, Math.max(min, value));
}

function formatStepperValue(value) {
  return Number.isInteger(value) ? String(value) : value.toFixed(1).replace(".", ",");
}

function syncStepper(id) {
  const config = steppers[id];
  const value = Number(config.input.value);
  config.output.textContent = `${formatStepperValue(value)}${config.suffix}`;
}

function setStepperValue(id, value) {
  const config = steppers[id];
  const rounded = Math.round(value / config.step) * config.step;
  const next = clamp(rounded, config.min, config.max);
  config.input.value = String(next);
  syncStepper(id);
  mobileDesign();
}

function setMessage(text, type = "") {
  fields.message.textContent = text;
  fields.message.className = `message ${type}`;
}

function updateTapeInfo(info) {
  fields.tapeInfo.hidden = !info;
  if (!info) return;
  const media = info.mediaType?.name || "Unbekannt";
  const bg = info.tapeColor || { name: "Unbekannt", css: "#d1d5db" };
  const text = info.textColor || { name: "Unbekannt", css: "#111111" };
  fields.tapeInfoType.textContent = `${info.width} mm · ${media}${info.mediaType?.code ? ` (${info.mediaType.code})` : ""}`;
  fields.tapePrintableWidth.textContent = info.printableWidthPx ? `${info.printableWidthPx} px` : "-";
  fields.tapeBgText.textContent = `${bg.name}${bg.code ? ` (${bg.code})` : ""}`;
  fields.tapeBgSwatch.style.background = bg.css;
  fields.tapeTextText.textContent = `${text.name}${text.code ? ` (${text.code})` : ""}`;
  fields.tapeTextSwatch.style.background = text.css;
}

function mobileDesign() {
  const tapeWidth = Number(fields.tape.value);
  const margin = Number(fields.margin.value);
  const text = fields.text.value.trim() || " ";
  const fontSize = Number(fields.font.value);
  const length = estimateTextLengthMm(text, fontSize, margin, fields.frame.checked);
  const objects = [];
  if (fields.frame.checked) {
    objects.push({
      id: "frame",
      type: "shape",
      x: margin,
      y: margin,
      w: Math.max(2, length - margin * 2),
      h: Math.max(2, tapeWidth - margin * 2),
      lineMm: 0.25,
      fill: false,
    });
  }
  objects.push({
    id: "text",
    type: "text",
    x: margin + (fields.frame.checked ? 1 : 0),
    y: margin,
    w: Math.max(2, length - margin * 2 - (fields.frame.checked ? 2 : 0)),
    h: Math.max(2, tapeWidth - margin * 2),
    text,
    fontSizeMm: fontSize,
    bold: fields.bold.checked,
    align: fields.align.value,
    valign: "middle",
  });
  return {
    tapeWidthMm: tapeWidth,
    lengthMm: length,
    autoLength: true,
    marginMm: margin,
    orientation: "landscape",
    cutMode: "auto",
    halfcut: "off",
    objects,
  };
}

async function send(url) {
  setMessage("Rendere Etikett...");
  const response = await fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ design: mobileDesign(), copies: Number(fields.copies.value) || 1 }),
  });
  const payload = await response.json();
  if (!payload.ok) {
    setMessage(payload.error || "Fehler", "error");
    return;
  }
  fields.preview.src = `${payload.image}?t=${Date.now()}`;
  setMessage(payload.message || "Vorschau erstellt.", "success");
}

document.getElementById("mobilePreviewBtn").addEventListener("click", () => send("/api/preview"));
document.getElementById("mobilePrintBtn").addEventListener("click", () => send("/api/print"));
document.getElementById("mobileDetect").addEventListener("click", async () => {
  setMessage("Erkenne Band...");
  const response = await fetch("/api/tape-info");
  const payload = await response.json();
  if (!payload.ok) {
    setMessage(payload.error || "Band konnte nicht erkannt werden.", "error");
    return;
  }
  fields.tape.value = String(payload.width);
  updateTapeInfo(payload);
  const bg = payload.tapeColor?.name ? `, ${payload.tapeColor.name}` : "";
  const text = payload.textColor?.name ? ` / ${payload.textColor.name}` : "";
  setMessage(`Band erkannt: ${payload.width} mm${bg}${text}`, "success");
});

["text", "frame", "bold", "align", "tape"].forEach((name) => {
  fields[name].addEventListener("input", () => {
    mobileDesign();
  });
});

document.querySelectorAll(".stepper").forEach((stepper) => {
  const id = stepper.dataset.stepper;
  stepper.querySelectorAll("button").forEach((button) => {
    button.addEventListener("click", () => {
      setStepperValue(id, Number(steppers[id].input.value) + Number(button.dataset.step));
    });
  });
  syncStepper(id);
});

mobileDesign();