// pages/goods-detail/goods-detail.js
const API = require('../../utils/api.js')

// 格式化毛重显示的辅助函数
function formatGrossWeight(grossWeight, weight) {
  console.log('===== formatGrossWeight 函数调用 =====');
  console.log('输入参数:');
  console.log('- grossWeight:', grossWeight, '(类型:', typeof grossWeight, ')');
  console.log('- weight:', weight, '(类型:', typeof weight, ')');

  // 1. 优先使用grossWeight，只要它不是null、不是undefined、不是空字符串
  if (grossWeight !== null && grossWeight !== undefined && grossWeight !== '') {
    console.log('使用grossWeight参数');
    return grossWeight;
  }
  // 如果grossWeight无效，尝试使用weight字段
  if (weight !== null && weight !== undefined && weight !== '') {
    console.log('使用weight参数');
    return weight;
  }

  // 3. 新增逻辑：如果grossWeight和weight都无效，返回空字符串以支持文字输入
  console.log('两个参数都无效，返回空字符串');
  return "";
}

Page({
  data: {
    goodsDetail: {}, // 当前商品详情
    showImagePreview: false,  // 控制图片预览弹窗显示
    previewImageUrls: [],     // 预览的图片URL列表
    previewImageIndex: 0,     // 当前预览图片的索引
    fromSeller: false,        // 是否来自seller页面
    // 图片缩放相关状态
    scale: 1,                    // 当前缩放比例
    lastScale: 1,                // 上一次缩放比例
    startDistance: 0,            // 双指起始距离
    doubleTapTimer: null,        // 双击计时器
    lastTapTime: 0,              // 上一次单击时间
    isScaling: false,            // 是否正在缩放中
    offsetX: 0,                  // X轴偏移量
    offsetY: 0,                  // Y轴偏移量
    initialTouch: null,         // 初始触摸点
  },

  onLoad(options) {
    console.log('商品详情页面加载，参数:', options);
    
    // 检查是否来自seller页面
    const fromSeller = options.fromSeller === '1' ? true : false;
    
    // 支持两种参数传递方式：直接传递商品数据或仅传递商品ID
    if (options.goodsData) {
      try {
        // 解析JSON字符串为商品对象
        const goodsData = JSON.parse(decodeURIComponent(options.goodsData));
        console.log('解析后的商品数据:', goodsData);
        
        // 从本地存储获取已预约商品ID列表
        const reservedGoodsIds = wx.getStorageSync('reservedGoodsIds') || [];
        const product = goodsData;
        
        // 确保商品ID的一致性
        const productIdStr = String(product.productId || product.id);

        // 增强的预约人数计算逻辑
        const selectedValue = product.selected;
        const reservedCountValue = product.reservedCount;
        const reservationCountValue = product.reservationCount;

        const finalReservationCount = selectedValue !== undefined && selectedValue !== null ? selectedValue :
          (reservedCountValue !== undefined && reservedCountValue !== null ? reservedCountValue :
            (reservationCountValue || 0));

        // 处理grossWeight为null或无效的情况，返回空字符串以支持文字输入
        const grossWeightValue = product.grossWeight !== null && product.grossWeight !== undefined ? product.grossWeight : '';

        // 转换商品数据格式，与loadGoodsDetail保持一致
        const formattedGoods = {
          id: productIdStr,
          productId: productIdStr,
          name: product.productName,
          price: product.price,
          minOrder: product.minOrder || product.quantity,
          yolk: product.yolk,
          spec: product.spec || product.specification,
          region: product.region,
          contact_phone: product.contact_phone || product.contactPhone,
          product_contact: product.product_contact || product.contactName,
          imageUrls: product.imageUrls || product.images || [],
          displayGrossWeight: formatGrossWeight(grossWeightValue, product.weight),
          isReserved: reservedGoodsIds.some(itemId => String(itemId) === productIdStr),
          reservedCount: finalReservationCount,
          created_at: product.created_at || product.createdAt,
          updated_at: product.updated_at || product.updatedAt,
          status: product.status || 'published'
        };
        
        // 设置商品详情数据和来源标识
        this.setData({
          goodsDetail: formattedGoods,
          fromSeller: fromSeller
        });
      } catch (error) {
        console.error('解析商品数据失败:', error);
        wx.showToast({
          title: '数据解析错误',
          icon: 'none',
          duration: 2000
        });
        // 2秒后返回上一页
        setTimeout(() => {
          wx.navigateBack();
        }, 2000);
      }
    } else if (options.id) {
      // 如果只传递了商品ID，则从服务器加载商品详情
      this.loadGoodsDetail(options.id);
      
      // 设置来源标识
      this.setData({
        fromSeller: fromSeller
      });
    } else {
      wx.showToast({
        title: '参数错误',
        icon: 'none',
        duration: 2000
      });
      // 2秒后返回上一页
      setTimeout(() => {
        wx.navigateBack();
      }, 2000);
    }
  },

  // 加载商品详情
  loadGoodsDetail(goodsId) {
    wx.showLoading({
      title: '加载中',
    });

    API.getProductDetail({ productId: goodsId })
      .then(res => {
        console.log('获取商品详情成功:', res);
        if (res && res.code === 200 && res.data) {
          // 从本地存储获取已预约商品ID列表
          const reservedGoodsIds = wx.getStorageSync('reservedGoodsIds') || [];
          const product = res.data;
          
          // 确保商品ID的一致性
          const productIdStr = String(product.productId || product.id);

          // 增强的预约人数计算逻辑
          const selectedValue = product.selected;
          const reservedCountValue = product.reservedCount;
          const reservationCountValue = product.reservationCount;

          const finalReservationCount = selectedValue !== undefined && selectedValue !== null ? selectedValue :
            (reservedCountValue !== undefined && reservedCountValue !== null ? reservedCountValue :
              (reservationCountValue || 0));

          // 处理grossWeight为null或无效的情况，返回空字符串以支持文字输入
          const grossWeightValue = product.grossWeight !== null && product.grossWeight !== undefined ? product.grossWeight : '';

          // 转换商品数据格式
          const formattedGoods = {
            id: productIdStr,
            productId: productIdStr,
            name: product.productName,
            price: product.price,
            minOrder: product.minOrder || product.quantity,
            yolk: product.yolk,
            spec: product.spec || product.specification,
            region: product.region,
            contact_phone: product.contact_phone || product.contactPhone,
            product_contact: product.product_contact || product.contactName,
            imageUrls: product.imageUrls || product.images || [],
            displayGrossWeight: formatGrossWeight(grossWeightValue, product.weight),
            isReserved: reservedGoodsIds.some(itemId => String(itemId) === productIdStr),
            reservedCount: finalReservationCount,
            created_at: product.created_at || product.createdAt,
            updated_at: product.updated_at || product.updatedAt
          };

          this.setData({
            goodsDetail: formattedGoods
          });
        } else {
          wx.showToast({
            title: '获取商品详情失败',
            icon: 'none',
            duration: 2000
          });
        }
      })
      .catch(err => {
        console.error('获取商品详情失败:', err);
        wx.showToast({
          title: '获取商品详情失败',
          icon: 'none',
          duration: 2000
        });
      })
      .finally(() => {
        wx.hideLoading();
      });
  },

  // 预览图片
  previewImage(e) {
    console.log('预览图片事件:', e);
    const { urls, index } = e.currentTarget.dataset;
    if (!urls || urls.length === 0) {
      wx.showToast({
        title: '没有图片可预览',
        icon: 'none'
      });
      return;
    }

    this.setData({
      showImagePreview: true,
      previewImageUrls: urls,
      previewImageIndex: parseInt(index || 0)
    });
    this.resetZoom();
  },

  // 关闭图片预览
  closeImagePreview() {
    this.setData({
      showImagePreview: false
    });
    this.resetZoom();
  },

  // 重置缩放状态
  resetZoom() {
    this.setData({
      scale: 1,
      offsetX: 0,
      offsetY: 0,
      lastScale: 1,
      startDistance: 0,
      isScaling: false,
      initialTouch: null,
      lastTapTime: 0
    });
  },

  // 图片预览切换
  onPreviewImageChange(e) {
    console.log('图片预览切换:', e);
    this.setData({
      previewImageIndex: e.detail.current
    });
    // 切换图片时重置缩放状态
    this.resetZoom();
  },

  // 处理图片点击事件（单击/双击判断）
  handleImageTap(e) {
    console.log('图片点击事件:', e);
    const currentTime = Date.now();
    const lastTapTime = this.data.lastTapTime || 0;

    // 判断是否为双击（300ms内连续点击）
    if (currentTime - lastTapTime < 300) {
      // 双击事件
      if (this.data.doubleTapTimer) {
        clearTimeout(this.data.doubleTapTimer);
      }

      // 切换放大/缩小状态
      const newScale = this.data.scale === 1 ? 2 : 1;
      this.setData({
        scale: newScale,
        lastScale: newScale,
        offsetX: 0,
        offsetY: 0,
        lastTapTime: 0 // 重置双击状态
      });
    } else {
      // 单击事件，设置延迟来检测是否会成为双击
      if (this.data.doubleTapTimer) {
        clearTimeout(this.data.doubleTapTimer);
      }

      this.setData({
        lastTapTime: currentTime,
        doubleTapTimer: setTimeout(() => {
          // 确认是单击，关闭图片预览
          this.closeImagePreview();
        }, 300)
      });
    }
  },

  // 计算两点之间的距离
  calculateDistance(touch1, touch2) {
    const dx = touch2.clientX - touch1.clientX;
    const dy = touch2.clientY - touch1.clientY;
    return Math.sqrt(dx * dx + dy * dy);
  },

  // 处理触摸开始事件
  handleTouchStart(e) {
    console.log('触摸开始事件:', e);
    const touches = e.touches;

    if (touches.length === 1) {
      // 单指：准备拖动
      this.setData({
        initialTouch: {
          x: touches[0].clientX,
          y: touches[0].clientY
        }
      });
    } else if (touches.length === 2) {
      // 双指：记录起始距离，准备缩放
      const distance = this.calculateDistance(touches[0], touches[1]);
      this.setData({
        startDistance: distance,
        isScaling: true,
        lastScale: this.data.scale
      });
    }
  },

  // 处理触摸移动事件
  handleTouchMove(e) {
    console.log('触摸移动事件:', e);
    const touches = e.touches;

    if (touches.length === 1 && this.data.initialTouch && this.data.scale !== 1) {
      // 单指拖动（只有在缩放状态下才允许拖动）
      const deltaX = touches[0].clientX - this.data.initialTouch.x;
      const deltaY = touches[0].clientY - this.data.initialTouch.y;

      // 计算新的偏移量
      let newOffsetX = this.data.offsetX + deltaX;
      let newOffsetY = this.data.offsetY + deltaY;

      // 边界限制
      const windowWidth = wx.getSystemInfoSync().windowWidth;
      const windowHeight = wx.getSystemInfoSync().windowHeight;
      const maxOffsetX = (windowWidth * (this.data.scale - 1)) / 2;
      const maxOffsetY = (windowHeight * (this.data.scale - 1)) / 2;

      newOffsetX = Math.max(-maxOffsetX, Math.min(maxOffsetX, newOffsetX));
      newOffsetY = Math.max(-maxOffsetY, Math.min(maxOffsetY, newOffsetY));

      this.setData({
        offsetX: newOffsetX,
        offsetY: newOffsetY,
        initialTouch: {
          x: touches[0].clientX,
          y: touches[0].clientY
        }
      });
    } else if (touches.length === 2) {
      // 双指缩放
      const currentDistance = this.calculateDistance(touches[0], touches[1]);
      const scale = (currentDistance / this.data.startDistance) * this.data.lastScale;

      // 限制缩放范围在0.5倍到3倍之间
      const newScale = Math.max(0.5, Math.min(3, scale));

      this.setData({
        scale: newScale,
        isScaling: true
      });
    }
  },

  // 处理触摸结束事件
  handleTouchEnd(e) {
    console.log('触摸结束事件:', e);
    this.setData({
      isScaling: false,
      lastScale: this.data.scale,
      initialTouch: null
    });
  },

  // 拨打电话
  makePhoneCall(e) {
    console.log('拨打电话事件:', e);
    const phoneNumber = e.currentTarget.dataset.phone;
    if (phoneNumber) {
      wx.showModal({
        title: '联系人电话',
        content: phoneNumber,
        showCancel: true,
        cancelText: '取消',
        confirmText: '拨打',
        success: (res) => {
          if (res.confirm) {
            wx.makePhoneCall({
              phoneNumber: phoneNumber,
              success: () => {
                console.log('拨打电话成功');
              },
              fail: (err) => {
                console.error('拨打电话失败', err);
                wx.showToast({
                  title: '拨打电话失败',
                  icon: 'none'
                });
              }
            });
          }
        }
      });
    }
  },

  // 我想要（预约）
  onClickWantInDetail(e) {
    console.log('我想要事件:', e);
    const { id } = e.currentTarget.dataset;
    if (!id) return;

    // 从本地存储获取openid
    const openid = wx.getStorageSync('openid');
    console.log('openid:', openid);

    // 检查是否已登录
    if (!openid) {
      // 如果未登录，显示授权登录弹窗
      this.setData({ showAuthModal: true });
      return;
    }

    // 获取已预约商品ID列表
    let reservedGoodsIds = wx.getStorageSync('reservedGoodsIds') || [];
    
    // 检查是否已经预约过
    if (reservedGoodsIds.some(itemId => String(itemId) === String(id))) {
      wx.showToast({
        title: '您已经预约过该商品',
        icon: 'none',
        duration: 1500
      });
      return;
    }

    // 添加到已预约列表
    reservedGoodsIds.push(id);
    wx.setStorageSync('reservedGoodsIds', reservedGoodsIds);
    
    // 更新页面状态
    this.setData({
      'goodsDetail.isReserved': true
    });

    // 调用API记录预约
    API.reserveProduct({ id: id })
      .then(res => {
        console.log('预约成功:', res);
        wx.showToast({
          title: '预约成功',
          icon: 'success',
          duration: 1500
        });
      })
      .catch(err => {
        console.error('预约失败:', err);
        // 如果API调用失败，从本地列表中移除
        reservedGoodsIds = reservedGoodsIds.filter(itemId => String(itemId) !== String(id));
        wx.setStorageSync('reservedGoodsIds', reservedGoodsIds);
        // 更新页面状态
        this.setData({
          'goodsDetail.isReserved': false
        });
        wx.showToast({
          title: '预约失败，请重试',
          icon: 'none',
          duration: 1500
        });
      });
  },

  // 返回上一页
  goBack() {
    wx.navigateBack();
  }
});