import React, { useState, useEffect, useCallback } from 'react'
import { View, Text, Image, ScrollView } from '@tarojs/components'
import Taro from '@tarojs/taro'
import { Button } from '@nutui/nutui-react-taro'
import { getShopOrder, prepayShopOrder, updateShopOrder, repairOrder, removeShopOrder } from '@/api/shop/shopOrder'
import { listShopOrderGoodsByOrderId } from '@/api/shop/shopOrderGoods'
import type { ShopOrder } from '@/api/shop/shopOrder/model'
import { OrderStatus, OrderStatusText } from '@/types/order'
import Price from '@/components/common/Price'
import { getCompressedImageUrl } from '@/utils/image'

definePageConfig({
  navigationBarTitleText: '订单详情',
})

// 支付方式映射
const PAY_TYPE_MAP: Record<number, string> = {
  0: '余额支付',
  1: '微信支付',
  2: '支付宝',
  3: '银联支付',
  4: '现金支付',
  5: 'POS机',
  6: '免费',
  7: '积分支付',
  8: '货到付款',
  9: '线下付款',
}

// 发票状态映射
const INVOICE_STATUS_MAP: Record<number, string> = {
  0: '未开票',
  1: '已开票',
  2: '不可开票',
}

// 发货状态映射
const DELIVERY_STATUS_MAP: Record<number, string> = {
  10: '未发货',
  20: '已发货',
  30: '部分发货',
}

// 配送方式映射: 0=快递配送, 1=无需发货/自提, 2=商家送货
const DELIVERY_TYPE_MAP: Record<number, string> = {
  0: '快递配送',
  1: '自提',
  2: '商家送货',
}

/** 根据订单状态计算展示用的状态标签 */
const getOrderDisplayStatus = (order: ShopOrder): { title: string; bgColor: string; subtitle: string } => {
  const { payStatus, deliveryStatus, orderStatus, payType } = order
  const isCod = payType === 8 // 货到付款
  const isOffline = payType === 9 // 线下付款

  // 退款/取消相关状态
  if (orderStatus === OrderStatus.Cancelled) {
    return { bgColor: '#999', title: '已取消', subtitle: '订单已取消' }
  }
  if (orderStatus === OrderStatus.Cancelling) {
    return { bgColor: '#ff7d00', title: '取消中', subtitle: '退款处理中' }
  }
  if (orderStatus === OrderStatus.RefundSuccess) {
    return { bgColor: '#999', title: '已退款', subtitle: '退款已原路返回' }
  }
  if (orderStatus === OrderStatus.RefundApply || orderStatus === OrderStatus.ClientRefundApply) {
    return { bgColor: '#ee0a24', title: '退款申请中', subtitle: '商家正在处理退款' }
  }
  if (orderStatus === OrderStatus.RefundRejected) {
    return { bgColor: '#ee0a24', title: '退款被拒绝', subtitle: '退款申请已被拒绝' }
  }

  // 正常订单流程
  if (!payStatus && !isCod && !isOffline) {
    return { bgColor: '#ff7d00', title: '待付款', subtitle: '请尽快完成支付' }
  }
  if (isOffline && !payStatus) {
    return { bgColor: '#4b9cf5', title: '待发货', subtitle: '请通过微信转账完成付款，商家确认后发货' }
  }
  if (isCod && !payStatus) {
    return { bgColor: '#4b9cf5', title: '待发货', subtitle: '送达时支付' }
  }
  if (deliveryStatus === 10) {
    return { bgColor: '#4b9cf5', title: '待发货', subtitle: '商家正在准备商品' }
  }
  if (deliveryStatus === 20 || deliveryStatus === 30) {
    return { bgColor: '#4b9cf5', title: '待收货', subtitle: '商品运输中，请注意查收' }
  }
  if (orderStatus === OrderStatus.Completed) {
    return { bgColor: '#0e932e', title: '已完成', subtitle: '交易已完成，感谢购买' }
  }
  if (orderStatus === OrderStatus.Unused) {
    return { bgColor: '#0e932e', title: '已付款', subtitle: '订单已支付' }
  }

  // 默认
  return { bgColor: '#999', title: OrderStatusText[orderStatus ?? 0] || '未知', subtitle: '' }
}

/** 根据订单状态判断当前操作阶段 */
type OrderPhase = 'unpaid' | 'offline_pending' | 'unshipped' | 'shipped' | 'completed' | 'cancelled' | 'refund'

const getOrderPhase = (order: ShopOrder): OrderPhase => {
  const { payStatus, deliveryStatus, orderStatus, payType } = order
  const isCod = payType === 8 // 货到付款
  const isOffline = payType === 9 // 线下付款

  // 退款/取消
  if ([OrderStatus.Cancelled, OrderStatus.Cancelling, OrderStatus.RefundSuccess, OrderStatus.RefundApply, OrderStatus.ClientRefundApply, OrderStatus.RefundRejected].includes(orderStatus as OrderStatus)) {
    return orderStatus === OrderStatus.Cancelled || orderStatus === OrderStatus.RefundSuccess ? 'cancelled' : 'refund'
  }

  // 线下付款且未确认收款：等待商家确认，不显示"立即支付"按钮
  if (isOffline && !payStatus) return 'offline_pending'
  // 货到付款订单：payStatus=true 但还未实际付款，直接进入 unshipped 阶段（不需要"立即支付"按钮）
  if (!payStatus && !isCod) return 'unpaid'
  if (deliveryStatus === 10) return 'unshipped'
  if (deliveryStatus === 20 || deliveryStatus === 30) return 'shipped'
  if (orderStatus === OrderStatus.Completed) return 'completed'

  return 'unshipped'
}

const OrderDetailPage: React.FC = () => {
  const { id } = Taro.getCurrentInstance().router?.params || {}
  const [order, setOrder] = useState<ShopOrder | null>(null)
  const [loading, setLoading] = useState(false)

  const loadOrder = useCallback(async () => {
    if (!id) return
    try {
      const orderData = await getShopOrder(Number(id))
      // 如果订单中没有商品清单，则单独加载
      if (!orderData.orderGoods || orderData.orderGoods.length === 0) {
        try {
          const goods = await listShopOrderGoodsByOrderId(Number(id))
          orderData.orderGoods = goods
        } catch {
          // 忽略加载商品失败
        }
      }
      setOrder(orderData)
    } catch {
      Taro.showToast({ title: '加载失败', icon: 'none' })
    }
  }, [id])

  useEffect(() => {
    loadOrder()
  }, [loadOrder])

  // 格式化时间
  const formatTime = (time: string | undefined) => {
    if (!time) return '-'
    return time.replace('T', ' ').slice(0, 19)
  }

  // 取消订单
  const handleCancelOrder = () => {
    Taro.showModal({
      title: '确认取消',
      content: '确定要取消该订单吗？',
      confirmColor: '#ee0a24',
      success: async (res) => {
        if (res.confirm && order) {
          try {
            await updateShopOrder({ ...order, orderStatus: OrderStatus.Cancelled })
            Taro.showToast({ title: '订单已取消', icon: 'success' })
            loadOrder()
          } catch {
            Taro.showToast({ title: '取消失败', icon: 'none' })
          }
        }
      }
    })
  }

  // 立即支付
  const handlePay = async () => {
    if (!order || loading) return
    setLoading(true)
    try {
      const payResult = await prepayShopOrder({ orderId: order.orderId!, payType: 1 })
      if (payResult) {
        await Taro.requestPayment({
          timeStamp: payResult.timeStamp,
          nonceStr: payResult.nonceStr,
          package: payResult.package,
          signType: payResult.signType,
          paySign: payResult.paySign,
        })
        Taro.showToast({ title: '支付成功', icon: 'success' })
        loadOrder()
      }
    } catch (err: any) {
      if (err?.message !== 'requestPayment:fail cancel') {
        Taro.showToast({ title: err?.message || '支付失败', icon: 'none' })
      }
    } finally {
      setLoading(false)
    }
  }

  // 确认收货
  const handleConfirmReceive = () => {
    Taro.showModal({
      title: '确认收货',
      content: '确认已收到商品？',
      confirmColor: '#0e932e',
      success: async (res) => {
        if (res.confirm && order) {
          try {
            await updateShopOrder({ ...order, orderStatus: OrderStatus.Completed })
            Taro.showToast({ title: '已确认收货', icon: 'success' })
            loadOrder()
          } catch {
            Taro.showToast({ title: '操作失败', icon: 'none' })
          }
        }
      }
    })
  }

  // 删除订单
  const handleDeleteOrder = () => {
    Taro.showModal({
      title: '删除订单',
      content: '确定要删除该订单吗？删除后不可恢复',
      confirmColor: '#ee0a24',
      success: async (res) => {
        if (res.confirm && order) {
          try {
            await removeShopOrder(order.orderId)
            Taro.showToast({ title: '订单已删除', icon: 'success' })
            setTimeout(() => Taro.navigateBack(), 1000)
          } catch {
            Taro.showToast({ title: '删除失败', icon: 'none' })
          }
        }
      }
    })
  }

  if (!order) {
    return (
      <View className='min-h-screen bg-gray-50 flex items-center justify-center'>
        <Text className='text-gray-400 text-sm'>加载中...</Text>
      </View>
    )
  }

  const displayStatus = getOrderDisplayStatus(order)
  const phase = getOrderPhase(order)
  // deliveryType: 0=快递配送, 1=无需发货/自提, 2=商家送货
  const isExpress = order.deliveryType === 0 || order.deliveryType === 2 || order.deliveryType === undefined
  const goodsCount = order.orderGoods?.reduce((sum, g) => sum + (g.totalNum || 1), 0) || 0

  return (
    <View className='min-h-screen bg-gray-50 flex flex-col'>
      <ScrollView scrollY className='flex-1'>
        {/* 状态卡片 */}
        <View
          className='p-4'
          style={{ backgroundColor: displayStatus.bgColor }}
        >
          <Text className='text-white text-lg font-medium block'>{displayStatus.title}</Text>
          <Text className='text-white text-sm opacity-90 mt-1 block'>{displayStatus.subtitle}</Text>
          {phase === 'shipped' && (
            <View
              className='mt-2 px-3 py-2 rounded-lg inline-flex items-center'
              style={{ backgroundColor: 'rgba(255,255,255,0.2)' }}
              onClick={() => Taro.navigateTo({ url: `/pages/order/logistics?orderId=${order.orderId}` })}
            >
              <Text className='text-white text-xs'>查看物流</Text>
              <Text className='text-white text-xs ml-1'>›</Text>
            </View>
          )}
        </View>

        {/* 收货信息 */}
        {isExpress ? (
          <View className='bg-white mx-3 mt-3 p-3 rounded-lg'>
            <View className='flex items-start gap-2'>
              <Text className='text-base'>{order.deliveryType === 2 ? '🛵' : '📦'}</Text>
              <View className='flex-1'>
                <View className='flex gap-2 mb-1'>
                  <Text className='text-sm font-medium text-gray-800'>{order.realName || '未知'}</Text>
                  <Text className='text-sm text-gray-600'>{order.mobile || order.phone || '-'}</Text>
                </View>
                <Text className='text-xs text-gray-500'>{order.address || '未填写收货地址'}</Text>
                {order.deliveryType === 2 && order.expressMerchantName && (
                  <Text className='text-xs text-gray-400 mt-1'>配送门店: {order.expressMerchantName}</Text>
                )}
                {(order.sendStartTime || order.sendEndTime) && (
                  <Text className='text-xs text-gray-400 mt-1'>
                    期望配送: {order.sendStartTime?.slice(0, 10)} ~ {order.sendEndTime?.slice(0, 10)}
                  </Text>
                )}
              </View>
            </View>
          </View>
        ) : (
          <View className='bg-white mx-3 mt-3 p-3 rounded-lg'>
            <View className='flex items-start gap-2'>
              <Text className='text-base'>🏪</Text>
              <View className='flex-1'>
                <Text className='text-sm font-medium text-gray-800'>{order.selfTakeMerchantName || '自提点'}</Text>
                <Text className='text-xs text-gray-500 mt-1'>{order.address || '-'}</Text>
                {order.selfTakeCode && (
                  <View className='mt-2 px-3 py-2 rounded-lg inline-flex items-center' style={{ backgroundColor: '#fff7e6' }}>
                    <Text className='text-xs text-orange-600'>自提码: {order.selfTakeCode}</Text>
                  </View>
                )}
              </View>
            </View>
          </View>
        )}

        {/* 商品列表 */}
        <View className='bg-white mx-3 mt-3 rounded-lg overflow-hidden'>
          <View className='p-3 border-b border-gray-100'>
            <Text className='text-sm font-medium text-gray-800'>商品清单 ({goodsCount}件)</Text>
          </View>
          {order.orderGoods?.map((item, idx) => (
            <View
              key={idx}
              className='flex gap-3 p-3 border-b border-gray-50'
              style={idx === (order.orderGoods?.length ?? 0) - 1 ? { borderBottom: 'none' } : undefined}
              onClick={() => item.goodsId && Taro.navigateTo({ url: `/pages/shop/product-detail?id=${item.goodsId}` })}
            >
              <View className='w-16 h-16 rounded-md bg-gray-100 flex-shrink-0 overflow-hidden'>
                {item.image ? (
                  <Image className='w-full h-full' src={getCompressedImageUrl(item.image)} mode='aspectFill' />
                ) : (
                  <View className='w-full h-full flex items-center justify-center'>
                    <Text className='text-xs text-gray-400'>暂无</Text>
                  </View>
                )}
              </View>
              <View className='flex-1 flex flex-col justify-between h-16'>
                <Text className='text-sm text-gray-800 line-clamp-1'>{item.goodsName || '未知商品'}</Text>
                {item.spec ? (
                  <Text className='text-xs text-gray-500 mt-1'>规格: {item.spec}</Text>
                ) : null}
              </View>
              <View className='flex flex-col items-end justify-between h-16'>
                <Price price={item.price || '0'} size='small' />
                <Text className='text-xs text-gray-500'>x{item.totalNum || 1}</Text>
              </View>
            </View>
          ))}
        </View>

        {/* 金额明细 */}
        <View className='bg-white mx-3 mt-3 p-3 rounded-lg'>
          <Text className='text-sm font-medium text-gray-800 mb-3 block'>金额明细</Text>
          <View className='space-y-2'>
            <View className='flex justify-between'>
              <Text className='text-sm text-gray-500'>商品总额</Text>
              <Text className='text-sm text-gray-700'>¥{order.totalPrice || '0.00'}</Text>
            </View>
            {Number(order.reducePrice || 0) > 0 && (
              <View className='flex justify-between'>
                <Text className='text-sm text-gray-500'>优惠</Text>
                <Text className='text-sm text-green-600'>-¥{order.reducePrice}</Text>
              </View>
            )}
            <View className='flex justify-between pt-2 border-t border-gray-100'>
              <Text className='text-sm font-medium text-gray-800'>实付金额</Text>
              <Price price={order.payPrice || '0'} size='normal' />
            </View>
            <View className='flex justify-between pt-2 border-t border-gray-100'>
              <Text className='text-xs text-gray-400'>支付方式</Text>
              <Text className='text-xs text-gray-500'>{PAY_TYPE_MAP[order.payType ?? 0] || '未知'}</Text>
            </View>
          </View>
        </View>

        {/* 订单信息 */}
        <View className='bg-white mx-3 mt-3 p-3 rounded-lg mb-4'>
          <Text className='text-sm font-medium text-gray-800 mb-3 block'>订单信息</Text>
          <View className='space-y-2'>
            <View className='flex justify-between'>
              <Text className='text-xs text-gray-400'>订单编号</Text>
              <View className='flex items-center gap-1'>
                <Text className='text-xs text-gray-600'>{order.orderNo}</Text>
                <Text
                  className='text-xs text-blue-500'
                  onClick={() => {
                    Taro.setClipboardData({ data: order.orderNo || '' })
                    Taro.showToast({ title: '已复制', icon: 'none' })
                  }}
                >
                  复制
                </Text>
              </View>
            </View>
            <View className='flex justify-between'>
              <Text className='text-xs text-gray-400'>发货状态</Text>
              <Text className='text-xs text-gray-600'>{DELIVERY_STATUS_MAP[order.deliveryStatus ?? 10]}</Text>
            </View>
            <View className='flex justify-between'>
              <Text className='text-xs text-gray-400'>配送方式</Text>
              <Text className='text-xs text-gray-600'>{DELIVERY_TYPE_MAP[order.deliveryType ?? 0] || '未知'}</Text>
            </View>
            <View className='flex justify-between'>
              <Text className='text-xs text-gray-400'>创建时间</Text>
              <Text className='text-xs text-gray-600'>{formatTime(order.createTime)}</Text>
            </View>
            {order.payTime && (
              <View className='flex justify-between'>
                <Text className='text-xs text-gray-400'>支付时间</Text>
                <Text className='text-xs text-gray-600'>{formatTime(order.payTime)}</Text>
              </View>
            )}
            {order.deliveryTime && (
              <View className='flex justify-between'>
                <Text className='text-xs text-gray-400'>发货时间</Text>
                <Text className='text-xs text-gray-600'>{formatTime(order.deliveryTime)}</Text>
              </View>
            )}
            {order.comments && (
              <View className='flex justify-start'>
                <Text className='text-xs text-gray-400 mr-2'>备注</Text>
                <Text className='text-xs text-gray-600 flex-1'>{order.comments}</Text>
              </View>
            )}
            <View className='flex justify-between'>
              <Text className='text-xs text-gray-400'>发票状态</Text>
              <Text className='text-xs text-gray-600'>{INVOICE_STATUS_MAP[order.isInvoice ?? 0]}</Text>
            </View>
          </View>
        </View>
      </ScrollView>

      {/* 底部操作按钮（根据订单阶段动态显示） */}
      <View
        className='bg-white border-t border-gray-100 p-3 flex flex-row gap-2'
        style={{ paddingBottom: '20px' }}
      >
        {/* 待付款: 取消 + 支付 */}
        {phase === 'unpaid' && (
          <>
            <Button
              size='small'
              className='flex-1'
              style={{ borderColor: '#ddd', color: '#666' }}
              onClick={handleCancelOrder}
            >
              取消订单
            </Button>
            <Button
              size='small'
              className='flex-1'
              style={{ backgroundColor: '#ee0a24' }}
              loading={loading}
              onClick={handlePay}
            >
              立即支付
            </Button>
          </>
        )}

        {/* 线下付款·待确认: 取消 + 联系客服 */}
        {phase === 'offline_pending' && (
          <>
            <Button
              size='small'
              className='flex-1'
              style={{ borderColor: '#ddd', color: '#666' }}
              onClick={handleCancelOrder}
            >
              取消订单
            </Button>
            <Button
              size='small'
              className='flex-1'
              style={{ backgroundColor: '#4b9cf5' }}
              onClick={() => Taro.makePhoneCall({ phoneNumber: '400-000-0000' })}
            >
              联系客服
            </Button>
          </>
        )}

        {/* 待发货: 退款 + 联系客服 */}
        {phase === 'unshipped' && (
          <>
            <Button
              size='small'
              className='flex-1'
              style={{ borderColor: '#ddd', color: '#666' }}
              onClick={() => Taro.navigateTo({ url: `/pages/order/refund?orderId=${order.orderId}` })}
            >
              退款
            </Button>
            <Button
              size='small'
              className='flex-1'
              style={{ backgroundColor: '#4b9cf5' }}
              onClick={() => Taro.makePhoneCall({ phoneNumber: '400-000-0000' })}
            >
              联系客服
            </Button>
          </>
        )}

        {/* 待收货: 物流 + 确认收货 */}
        {phase === 'shipped' && (
          <>
            <Button
              size='small'
              className='flex-1'
              style={{ borderColor: '#4b9cf5', color: '#4b9cf5' }}
              onClick={() => Taro.navigateTo({ url: `/pages/order/logistics?orderId=${order.orderId}` })}
            >
              查看物流
            </Button>
            <Button
              size='small'
              className='flex-1'
              style={{ backgroundColor: '#0e932e' }}
              onClick={handleConfirmReceive}
            >
              确认收货
            </Button>
          </>
        )}

        {/* 已完成: 售后 + 删除 */}
        {phase === 'completed' && (
          <>
            <Button
              size='small'
              className='flex-1'
              style={{ borderColor: '#ddd', color: '#666' }}
              onClick={() => Taro.navigateTo({ url: `/pages/order/after-sale-apply?orderId=${order.orderId}&type=refund` })}
            >
              申请售后
            </Button>
            <Button
              size='small'
              className='flex-1'
              style={{ borderColor: '#ee0a24', color: '#ee0a24' }}
              onClick={handleDeleteOrder}
            >
              删除订单
            </Button>
          </>
        )}

        {/* 已取消/已退款: 删除 */}
        {phase === 'cancelled' && (
          <Button
            size='small'
            className='flex-1'
            style={{ borderColor: '#ee0a24', color: '#ee0a24' }}
            onClick={handleDeleteOrder}
          >
            删除订单
          </Button>
        )}
      </View>
    </View>
  )
}

export default OrderDetailPage