const store = require('../../utils/store.js');
const api = require('../../utils/api.js');
const { toastErr } = require('../../utils/ui.js');

// 卡片画布尺寸（逻辑像素）。真实导出会按 dpr 放大
const W = 620;
const H = 1000;

// 在 canvas 2d 上加载一张图（远程或本地），resolve 出可直接 drawImage 的 image 对象。
// 加载失败 resolve(null)——头像或小程序码缺一张不该让整张卡画不出来
function loadImage(canvas, src) {
  return new Promise((resolve) => {
    if (!src) return resolve(null);
    const img = canvas.createImage();
    img.onload = () => resolve(img);
    img.onerror = () => resolve(null);
    img.src = src;
  });
}

Page({
  data: {
    petId: '',
    card: null,
    cardImg: '',
    qrReady: false,
    saving: false,
  },
  onLoad(q) {
    store
      .ready()
      .then(() => {
        const id = (q && q.id) || store.currentPetId();
        if (!id) {
          wx.showToast({ title: '先选一只毛孩子', icon: 'none' });
          return;
        }
        this.setData({ petId: id });
        return api.petIDCard(id);
      })
      .then((card) => {
        if (!card) return;
        this.setData({ card, qrReady: !!card.qr_ready });
        // 布局要等页面渲染完 canvas 节点才拿得到，放 nextTick
        wx.nextTick(() => this.draw());
      })
      .catch((e) => toastErr(e));
  },

  draw() {
    wx.createSelectorQuery()
      .select('#idCanvas')
      .fields({ node: true, size: true })
      .exec((res) => {
        const node = res && res[0] && res[0].node;
        if (!node) return;
        let dpr = 2;
        try {
          dpr = (wx.getWindowInfo ? wx.getWindowInfo() : wx.getSystemInfoSync()).pixelRatio || 2;
        } catch (e) {
          dpr = 2;
        }
        node.width = W * dpr;
        node.height = H * dpr;
        const ctx = node.getContext('2d');
        ctx.scale(dpr, dpr);

        const c = this.data.card || {};
        // 两张远程图都就绪再开画，否则小程序码会画不上或画一半（plan 里点过名的坑）
        Promise.all([loadImage(node, c.avatar_url), loadImage(node, c.qr_url)]).then(([avatar, qr]) => {
          this.paint(ctx, node, c, avatar, qr);
        });
      });
  },

  paint(ctx, node, c, avatar, qr) {
    ctx.clearRect(0, 0, W, H);

    // 外层留白背景
    ctx.fillStyle = '#F3EFE8';
    ctx.fillRect(0, 0, W, H);

    const pad = 30;
    const cardW = W - pad * 2;

    // ═══ 正面：资料区（暖粉渐变）═══
    const s1Y = pad, s1H = 378;
    const g1 = ctx.createLinearGradient(pad, s1Y, W - pad, s1Y + s1H);
    g1.addColorStop(0, '#FFF0D6');
    g1.addColorStop(0.5, '#FFE0EC');
    g1.addColorStop(1, '#E6EEFF');
    this.roundRect(ctx, pad, s1Y, cardW, s1H, 28);
    ctx.fillStyle = g1;
    ctx.fill();
    // 爪印水印
    ctx.save();
    this.roundRect(ctx, pad, s1Y, cardW, s1H, 28);
    ctx.clip();
    ctx.globalAlpha = 0.06;
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.font = '130px sans-serif';
    ctx.fillText('🐾', W - pad - 80, s1Y + 100);
    ctx.restore();
    ctx.globalAlpha = 1;
    ctx.textBaseline = 'alphabetic';

    // 头像圆 + 白边
    const avX = pad + 34, avY = s1Y + 34, avD = 118;
    ctx.save();
    ctx.beginPath();
    ctx.arc(avX + avD / 2, avY + avD / 2, avD / 2, 0, Math.PI * 2);
    ctx.clip();
    if (avatar) {
      const iw = avatar.width || avD, ih = avatar.height || avD, side = Math.min(iw, ih);
      ctx.drawImage(avatar, (iw - side) / 2, (ih - side) / 2, side, side, avX, avY, avD, avD);
    } else {
      ctx.fillStyle = '#FFD9A3';
      ctx.fillRect(avX, avY, avD, avD);
      ctx.fillStyle = '#8A5A18';
      ctx.font = '52px sans-serif';
      ctx.textAlign = 'center';
      ctx.textBaseline = 'middle';
      ctx.fillText(c.species === '狗狗' ? '🐶' : '🐱', avX + avD / 2, avY + avD / 2);
    }
    ctx.restore();
    ctx.textBaseline = 'alphabetic';
    ctx.beginPath();
    ctx.arc(avX + avD / 2, avY + avD / 2, avD / 2, 0, Math.PI * 2);
    ctx.strokeStyle = 'rgba(255,255,255,.9)';
    ctx.lineWidth = 5;
    ctx.stroke();

    // 名字大字 + 物种·性别（头像右侧）
    const nameX = avX + avD + 26;
    ctx.textAlign = 'left';
    ctx.fillStyle = '#2D2925';
    ctx.font = '700 46px sans-serif';
    ctx.fillText(c.name || '毛孩子', nameX, avY + 54);
    ctx.fillStyle = '#9A8F82';
    ctx.font = '24px sans-serif';
    ctx.fillText(c.species + (c.gender ? '  ·  ' + c.gender : ''), nameX, avY + 96);

    // 资料 pair 行（头像下方，全宽两列）
    const infoX = pad + 40;
    let y = s1Y + avD + 60;
    const pair = (l1, v1, l2, v2) => {
      ctx.textAlign = 'left';
      ctx.font = '24px sans-serif';
      ctx.fillStyle = '#9A8F82';
      ctx.fillText(l1, infoX, y);
      ctx.fillStyle = '#2D2925';
      ctx.font = '600 26px sans-serif';
      ctx.fillText(v1 || '—', infoX + 66, y);
      if (l2) {
        const x2 = infoX + 300;
        ctx.fillStyle = '#9A8F82';
        ctx.font = '24px sans-serif';
        ctx.fillText(l2, x2, y);
        ctx.fillStyle = '#2D2925';
        ctx.font = '600 26px sans-serif';
        ctx.fillText(v2 || '—', x2 + 66, y);
      }
      y += 44;
    };
    pair('品种', c.breed, '毛色', c.color);
    pair('出生', c.birthday, '星座', c.zodiac);
    pair('体重', c.weight, '', '');

    // 性格标签 chips
    const tags = (c.personality || '').split(',').filter(Boolean);
    if (tags.length) {
      let tx = infoX;
      const ty = y + 8;
      tags.forEach((t) => {
        ctx.font = '22px sans-serif';
        const tw = ctx.measureText(t).width + 28;
        ctx.fillStyle = 'rgba(245,169,71,.2)';
        this.roundRect(ctx, tx, ty - 26, tw, 36, 18);
        ctx.fill();
        ctx.fillStyle = '#A96500';
        ctx.textAlign = 'left';
        ctx.fillText(t, tx + 14, ty);
        tx += tw + 12;
      });
    }

    // ═══ 照护信息 ═══
    const s2Y = s1Y + s1H + 14, s2H = 290;
    this.roundRect(ctx, pad, s2Y, cardW, s2H, 28);
    ctx.fillStyle = '#FFFFFF';
    ctx.fill();
    ctx.textAlign = 'left';
    ctx.fillStyle = '#B4623F';
    ctx.font = '700 30px sans-serif';
    ctx.fillText('照护信息', pad + 40, s2Y + 56);
    const kv = (label, value, yy) => {
      ctx.textAlign = 'left';
      ctx.font = '24px sans-serif';
      ctx.fillStyle = '#9A8F82';
      ctx.fillText(label, pad + 40, yy);
      ctx.font = '600 26px sans-serif';
      ctx.fillStyle = '#2D2925';
      ctx.fillText(value || '—', pad + 190, yy);
    };
    kv('主人', c.owner, s2Y + 108);
    kv('联系电话', c.phone || '未验证', s2Y + 152);
    kv('疫苗情况', c.vaccine_state, s2Y + 196);
    kv('备注', c.notes || '无', s2Y + 240);

    // ═══ 证件区（蓝紫渐变）+ 小程序码 ═══
    const s3Y = s2Y + s2H + 14, s3H = H - s3Y - pad;
    const g3 = ctx.createLinearGradient(pad, s3Y, W - pad, s3Y + s3H);
    g3.addColorStop(0, '#E8F0FF');
    g3.addColorStop(1, '#F0E8FF');
    this.roundRect(ctx, pad, s3Y, cardW, s3H, 28);
    ctx.fillStyle = g3;
    ctx.fill();
    ctx.textAlign = 'left';
    ctx.fillStyle = '#7D89A8';
    ctx.font = '22px sans-serif';
    ctx.fillText('宠 星 人 地 球 移 民', pad + 40, s3Y + 50);
    ctx.fillStyle = '#4A5878';
    ctx.font = '700 48px sans-serif';
    ctx.fillText('居民身份卡', pad + 40, s3Y + 112);
    ctx.fillStyle = '#8A93A8';
    ctx.font = '22px sans-serif';
    ctx.fillText('身份 ID　' + (c.id_no || ''), pad + 40, s3Y + 156);
    ctx.fillText('签发机构　' + (c.org || '肉垫计划'), pad + 40, s3Y + 190);
    ctx.fillText('有效期限　' + (c.validity || '永久有效'), pad + 40, s3Y + 224);

    // 小程序码
    const qrD = 118, qrX = W - pad - 36 - qrD, qrY = s3Y + s3H - 36 - qrD;
    ctx.fillStyle = '#fff';
    this.roundRect(ctx, qrX, qrY, qrD, qrD, 12);
    ctx.fill();
    if (qr) {
      ctx.drawImage(qr, qrX + 8, qrY + 8, qrD - 16, qrD - 16);
    } else {
      ctx.fillStyle = '#B5A99D';
      ctx.font = '20px sans-serif';
      ctx.textAlign = 'center';
      ctx.fillText('小程序码', qrX + qrD / 2, qrY + qrD / 2 - 4);
      ctx.fillText('待发布', qrX + qrD / 2, qrY + qrD / 2 + 26);
    }

    wx.canvasToTempFilePath(
      {
        canvas: node,
        fileType: 'png',
        success: (r) => this.setData({ cardImg: r.tempFilePath }),
        fail: () => wx.showToast({ title: '生成失败，稍后再试', icon: 'none' }),
      },
      this,
    );
  },

  roundRect(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();
  },

  // 微信取手机号：新版 getPhoneNumber 返回动态 code，后端换成真实手机号存库，
  // 拿回后重新取卡（此时电话就有了）并重画
  onGetPhone(e) {
    const d = e.detail || {};
    if (!d.code) return; // 用户拒绝授权
    wx.showLoading({ title: '验证中…', mask: true });
    api
      .bindPhone(d.code)
      .then(() => api.petIDCard(this.data.petId))
      .then((card) => {
        wx.hideLoading();
        if (card) {
          this.setData({ card, qrReady: !!card.qr_ready });
          this.draw();
        }
        wx.showToast({ title: '手机号已验证', icon: 'success' });
      })
      .catch((err) => {
        wx.hideLoading();
        toastErr(err, '验证失败');
      });
  },

  onSave() {
    if (!this.data.cardImg) return wx.showToast({ title: '还在生成，稍等一下', icon: 'none' });
    if (this.data.saving) return;
    this.setData({ saving: true });
    wx.saveImageToPhotosAlbum({
      filePath: this.data.cardImg,
      success: () => wx.showToast({ title: '已保存到相册', icon: 'success' }),
      fail: (err) => {
        const msg = (err && err.errMsg) || '';
        if (msg.indexOf('cancel') >= 0) return;
        // 拒过一次后 authorize 不再弹，必须引导去设置页
        if (msg.indexOf('auth deny') >= 0 || msg.indexOf('authorize') >= 0) {
          wx.showModal({
            title: '需要相册权限',
            content: '保存身份卡需要允许访问相册，去设置里打开一下？',
            confirmText: '去设置',
            success: (r) => r.confirm && wx.openSetting({}),
          });
          return;
        }
        wx.showToast({ title: '保存失败', icon: 'none' });
      },
      complete: () => this.setData({ saving: false }),
    });
  },

  onShareAppMessage() {
    const c = this.data.card || {};
    return {
      title: `${c.name || '我家毛孩子'} 的居民身份卡`,
      path: '/pages/idcard/idcard?id=' + this.data.petId,
      imageUrl: this.data.cardImg || '', // 用画好的卡当分享封面
    };
  },
});