function profile(pet) {
  return {
    ...pet,
    genderLabel:
      pet.gender === "male"
        ? "男孩"
        : pet.gender === "female"
          ? "女孩"
          : "未填写",
    birthday: pet.birth_date ? pet.birth_date.slice(0, 10) : "未填写",
    weightLabel: pet.weight_kg ? `${pet.weight_kg} kg` : "未填写",
    cardNumber:
      "PET-" + (pet.id || "").replace(/-/g, "").slice(0, 12).toUpperCase(),
  };
}

function round(ctx, x, y, w, h, r) {
  ctx.beginPath();
  ctx.moveTo(x + r, y);
  ctx.arcTo(x + w, y, x + w, y + h, r);
  ctx.arcTo(x + w, y + h, x, y + h, r);
  ctx.arcTo(x, y + h, x, y, r);
  ctx.arcTo(x, y, x + w, y, r);
  ctx.closePath();
}
function text(ctx, value, x, y, size, color, width, bold = false) {
  ctx.font = `${bold ? "600 " : ""}${size}px sans-serif`;
  ctx.fillStyle = color;
  let label = String(value || "未填写");
  if (width && ctx.measureText(label).width > width) {
    while (label && ctx.measureText(label + "…").width > width)
      label = label.slice(0, -1);
    label += "…";
  }
  ctx.fillText(label, x, y);
}
function image(canvas, path) {
  return new Promise((resolve, reject) => {
    const img = canvas.createImage();
    img.onload = () => resolve(img);
    img.onerror = () => reject(new Error("照片加载失败，请重试"));
    img.src = path;
  });
}
async function renderCard(canvas, pet) {
  const p = profile(pet);
  canvas.width = 1200;
  canvas.height = 760;
  const ctx = canvas.getContext("2d");
  ctx.clearRect(0, 0, 1200, 760);
  const gradient = ctx.createLinearGradient(0, 0, 1200, 760);
  gradient.addColorStop(0, "#fff3e5");
  gradient.addColorStop(1, "#f0e9f8");
  ctx.fillStyle = gradient;
  round(ctx, 0, 0, 1200, 760, 48);
  ctx.fill();
  ctx.save();
  round(ctx, 0, 0, 1200, 760, 48);
  ctx.clip();
  ctx.fillStyle = "#ffffff66";
  ctx.beginPath();
  ctx.arc(1080, 140, 180, 0, Math.PI * 2);
  ctx.fill();
  ctx.beginPath();
  ctx.arc(1020, 700, 210, 0, Math.PI * 2);
  ctx.fill();
  ctx.restore();
  ctx.strokeStyle = "#e9d6c7";
  ctx.lineWidth = 2;
  round(ctx, 20, 20, 1160, 720, 34);
  ctx.stroke();
  const logo = await image(canvas, "/assets/logo-corgi-v2.png");
  ctx.save();
  ctx.beginPath();
  ctx.arc(89, 87, 35, 0, Math.PI * 2);
  ctx.clip();
  ctx.drawImage(logo, 54, 52, 70, 70);
  ctx.restore();
  ctx.strokeStyle = "#fffaf4";
  ctx.lineWidth = 5;
  ctx.beginPath();
  ctx.arc(89, 87, 35, 0, Math.PI * 2);
  ctx.stroke();
  text(ctx, "肉垫计划", 140, 82, 27, "#795a4b", 220, true);
  text(ctx, "PAWPRINT ID", 140, 113, 18, "#a48d7e", 220);
  text(ctx, "毛孩身份卡", 842, 103, 38, "#604a40", 300, true);
  ctx.strokeStyle = "#dfcdbf";
  ctx.beginPath();
  ctx.moveTo(54, 155);
  ctx.lineTo(1146, 155);
  ctx.stroke();
  ctx.fillStyle = "#fffaf4";
  round(ctx, 58, 200, 310, 340, 28);
  ctx.fill();
  if (p.avatar_url) {
    const info = await new Promise((resolve, reject) =>
      wx.getImageInfo({
        src: p.avatar_url,
        success: resolve,
        fail: () => reject(new Error("照片下载失败，请检查网络后重试")),
      }),
    );
    const photo = await image(canvas, info.path);
    ctx.save();
    round(ctx, 70, 212, 286, 316, 20);
    ctx.clip();
    // Aspect fill, with a centered crop matching the card's portrait window.
    const ratio = 286 / 316;
    const sw = Math.min(photo.width, photo.height * ratio),
      sh = sw / ratio;
    ctx.drawImage(
      photo,
      (photo.width - sw) / 2,
      (photo.height - sh) / 2,
      sw,
      sh,
      70,
      212,
      286,
      316,
    );
    ctx.restore();
  } else {
    ctx.fillStyle = "#d18b67";
    ctx.beginPath();
    ctx.ellipse(213, 399, 53, 42, 0, 0, Math.PI * 2);
    ctx.fill();
    for (const [x, y, r] of [
      [145, 335, 20],
      [188, 309, 22],
      [235, 309, 22],
      [278, 335, 20],
    ]) {
      ctx.beginPath();
      ctx.arc(x, y, r, 0, Math.PI * 2);
      ctx.fill();
    }
    text(ctx, "等待一张可爱照片", 114, 491, 23, "#9b7966", 230);
  }
  text(ctx, p.name, 410, 250, 58, "#604a40", 700, true);
  text(
    ctx,
    `${p.breed || "品种未填写"}  ·  ${p.genderLabel}`,
    412,
    298,
    28,
    "#886c5f",
    700,
  );
  const fields = [
    ["生日", p.birthday, 412, 368],
    ["体重", p.weightLabel, 805, 368],
    ["毛色", p.coat || "未填写", 412, 465],
  ];
  for (const [label, value, x, y] of fields) {
    text(ctx, label, x, y, 23, "#a48d7e", 290);
    text(
      ctx,
      value,
      x,
      y + 43,
      31,
      "#604a40",
      x === 412 && y === 465 ? 680 : 300,
      true,
    );
  }
  ctx.strokeStyle = "#dfcdbf";
  ctx.beginPath();
  ctx.moveTo(54, 585);
  ctx.lineTo(1146, 585);
  ctx.stroke();
  text(ctx, "陪伴编号", 58, 635, 20, "#a48d7e", 200);
  text(ctx, p.cardNumber, 58, 676, 29, "#795a4b", 650, true);
  text(ctx, "每一位家人，都值得被好好照顾", 650, 669, 24, "#886c5f", 490);
  return new Promise((resolve, reject) =>
    wx.canvasToTempFilePath({
      canvas,
      fileType: "png",
      success: (res) => resolve(res.tempFilePath),
      fail: () => reject(new Error("档案图片生成失败，请重试")),
    }),
  );
}
async function saveToAlbum(filePath) {
  try {
    await new Promise((resolve, reject) =>
      wx.saveImageToPhotosAlbum({ filePath, success: resolve, fail: reject }),
    );
  } catch (error) {
    if (/cancel/.test(error.errMsg || "")) return false;
    const settings = await new Promise((resolve, reject) =>
      wx.getSetting({ success: resolve, fail: reject }),
    );
    if (settings.authSetting["scope.writePhotosAlbum"] !== false)
      throw new Error("保存失败，请在真机上重试");
    const confirm = await wx.showModal({
      title: "允许保存档案卡",
      content: "需要相册权限，将这张毛孩身份卡保存到你的手机。",
      confirmText: "去设置",
    });
    if (!confirm.confirm) return false;
    const enabled = await new Promise((resolve, reject) =>
      wx.openSetting({ success: resolve, fail: reject }),
    );
    if (!enabled.authSetting["scope.writePhotosAlbum"]) return false;
    await new Promise((resolve, reject) =>
      wx.saveImageToPhotosAlbum({
        filePath,
        success: resolve,
        fail: () => reject(new Error("保存失败，请重试")),
      }),
    );
  }
  return true;
}
module.exports = { profile, renderCard, saveToAlbum };