import React, {useState, useRef, useEffect, useCallback} from 'react'
import {View, Text} from '@tarojs/components'
import {
  Cell,
  Space,
  Button,
  Form,
  Input,
  CellGroup,
  Radio,
  Tabs,
  Tag,
  Empty,
  Loading,
  PullToRefresh
} from '@nutui/nutui-react-taro'
import {Wallet} from '@nutui/icons-react-taro'
import {businessGradients} from '@/styles/gradients'
import Taro from '@tarojs/taro'
import {useDealerUser} from '@/hooks/useDealerUser'
import {pageShopDealerWithdraw, addShopDealerWithdraw} from '@/api/shop/shopDealerWithdraw'
import type {ShopDealerWithdraw} from '@/api/shop/shopDealerWithdraw/model'

interface WithdrawRecordWithDetails extends ShopDealerWithdraw {
  accountDisplay?: string
}

const extractPackageInfo = (result: unknown): string | null => {
  if (!result || typeof result !== 'object') return null
  const r = result as any
  return (
    r.package_info ??
    r.packageInfo ??
    r.package ??
    null
  )
}

const canRequestMerchantTransferConfirm = (): boolean => {
  try {
    if (typeof (Taro as any).getEnv === 'function' && (Taro as any).ENV_TYPE) {
      const env = (Taro as any).getEnv()
      if (env !== (Taro as any).ENV_TYPE.WEAPP) return false
    }

    const api =
      (globalThis as any).wx?.requestMerchantTransfer ||
      (Taro as any).requestMerchantTransfer

    return typeof api === 'function'
  } catch {
    return false
  }
}

const requestMerchantTransferConfirm = (packageInfo: string): Promise<any> => {
  if (!canRequestMerchantTransferConfirm()) {
    return Promise.reject(new Error('请在微信小程序内完成收款确认'))
  }

  // Backend may wrap/format base64 with newlines; WeChat API requires a clean string.
  const cleanPackageInfo = String(packageInfo).replace(/\s+/g, '')

  const api =
    (globalThis as any).wx?.requestMerchantTransfer ||
    (Taro as any).requestMerchantTransfer

  if (typeof api !== 'function') {
    return Promise.reject(new Error('当前环境不支持商家转账收款确认（缺少 requestMerchantTransfer）'))
  }

  return new Promise((resolve, reject) => {
    api({
      // WeChat API uses `package`, backend returns `package_info`.
      package: cleanPackageInfo,
      mchId: '1737910695',
      appId: 'wxad831ba00ad6a026',
      success: (res: any) => resolve(res),
      fail: (err: any) => reject(err)
    })
  })
}

// Some backends may return money fields as number; keep internal usage always as string.
const normalizeMoneyString = (money: unknown) => {
  if (money === null || money === undefined || money === '') return '0.00'
  return typeof money === 'string' ? money : String(money)
}

const DealerWithdraw: React.FC = () => {
  const [activeTab, setActiveTab] = useState<string | number>('0')
  const [selectedAccount, setSelectedAccount] = useState('')
  const [loading, setLoading] = useState<boolean>(false)
  const [refreshing, setRefreshing] = useState<boolean>(false)
  const [submitting, setSubmitting] = useState<boolean>(false)
  const [availableAmount, setAvailableAmount] = useState<string>('0.00')
  const [withdrawRecords, setWithdrawRecords] = useState<WithdrawRecordWithDetails[]>([])
  const formRef = useRef<any>(null)

  const {dealerUser} = useDealerUser()

  // Tab 切换处理函数
  const handleTabChange = (value: string | number) => {
    console.log('Tab切换到:', value)
    setActiveTab(value)

    // 如果切换到提现记录页面，刷新数据
    if (String(value) === '1') {
      fetchWithdrawRecords()
    }
  }

  // 获取可提现余额
  const fetchBalance = useCallback(async () => {
    console.log(dealerUser, 'dealerUser...')
    try {
      setAvailableAmount(normalizeMoneyString(dealerUser?.money))
    } catch (error) {
      console.error('获取余额失败:', error)
    }
  }, [dealerUser])

  // 获取提现记录
  const fetchWithdrawRecords = useCallback(async () => {
    if (!dealerUser?.userId) return

    try {
      setLoading(true)
      const result = await pageShopDealerWithdraw({
        page: 1,
        limit: 100,
        userId: dealerUser.userId
      })

      if (result?.list) {
        const processedRecords = result.list.map(record => ({
          ...record,
          accountDisplay: getAccountDisplay(record)
        }))
        setWithdrawRecords(processedRecords)
      }
    } catch (error) {
      console.error('获取提现记录失败:', error)
      Taro.showToast({
        title: '获取提现记录失败',
        icon: 'error'
      })
    } finally {
      setLoading(false)
    }
  }, [dealerUser?.userId])

  // 格式化账户显示
  const getAccountDisplay = (record: ShopDealerWithdraw) => {
    if (record.payType === 10) {
      return '微信钱包'
    } else if (record.payType === 20 && record.alipayAccount) {
      return `支付宝(${record.alipayAccount.slice(-4)})`
    } else if (record.payType === 30 && record.bankCard) {
      return `${record.bankName || '银行卡'}(尾号${record.bankCard.slice(-4)})`
    }
    return '未知账户'
  }

  // 刷新数据
  const handleRefresh = async () => {
    setRefreshing(true)
    await Promise.all([fetchBalance(), fetchWithdrawRecords()])
    setRefreshing(false)
  }

  // 初始化加载数据
  useEffect(() => {
    if (dealerUser?.userId) {
      fetchBalance().then()
      fetchWithdrawRecords().then()
    }
  }, [fetchBalance, fetchWithdrawRecords])

  const getStatusText = (status?: number) => {
    switch (status) {
      case 40:
        return '已到账'
      case 20:
        return '审核通过'
      case 10:
        return '待审核'
      case 30:
        return '已驳回'
      default:
        return '未知'
    }
  }

  const getStatusColor = (status?: number) => {
    switch (status) {
      case 40:
        return 'success'
      case 20:
        return 'success'
      case 10:
        return 'warning'
      case 30:
        return 'danger'
      default:
        return 'default'
    }
  }

  const handleSubmit = async (values: any) => {
    if (!dealerUser?.userId) {
      Taro.showToast({
        title: '用户信息获取失败',
        icon: 'error'
      })
      return
    }

    if (!values.accountType) {
      Taro.showToast({
        title: '请选择提现方式',
        icon: 'error'
      })
      return
    }

    // 验证提现金额
    const amount = parseFloat(String(values.amount))
    const available = parseFloat(normalizeMoneyString(availableAmount).replace(/,/g, ''))

    if (isNaN(amount) || amount <= 0) {
      Taro.showToast({
        title: '请输入有效的提现金额',
        icon: 'error'
      })
      return
    }

    if (amount < 100) {
      // Taro.showToast({
      //   title: '最低提现金额为100元',
      //   icon: 'error'
      // })
      // return
    }

    if (amount > available) {
      Taro.showToast({
        title: '提现金额超过可用余额',
        icon: 'error'
      })
      return
    }

    // 验证账户信息
    if (values.accountType === 'alipay') {
      if (!values.account || !values.accountName) {
        Taro.showToast({
          title: '请填写完整的支付宝信息',
          icon: 'error'
        })
        return
      }
    } else if (values.accountType === 'bank') {
      if (!values.account || !values.accountName || !values.bankName) {
        Taro.showToast({
          title: '请填写完整的银行卡信息',
          icon: 'error'
        })
        return
      }
    }

    try {
      setSubmitting(true)

      const withdrawData: ShopDealerWithdraw = {
        userId: dealerUser.userId,
        money: values.amount,
        payType: values.accountType === 'wechat' ? 10 :
          values.accountType === 'alipay' ? 20 : 30,
        applyStatus: 10, // 待审核
        platform: 'MiniProgram'
      }

      // 根据提现方式设置账户信息
      if (values.accountType === 'alipay') {
        withdrawData.alipayAccount = values.account
        withdrawData.alipayName = values.accountName
      } else if (values.accountType === 'bank') {
        withdrawData.bankCard = values.account
        withdrawData.bankAccount = values.accountName
        withdrawData.bankName = values.bankName || '银行卡'
      }

      // WeChat wallet: backend should return `package_info`, frontend opens the "confirm receipt" page
      // for user to click "确认收款".
      if (values.accountType === 'wechat') {
        if (!canRequestMerchantTransferConfirm()) {
          throw new Error('当前环境不支持微信收款确认，请在微信小程序内操作')
        }

        const createResult = await addShopDealerWithdraw(withdrawData)
        const packageInfo = extractPackageInfo(createResult)
        if (!packageInfo) {
          throw new Error('后台未返回 package_info，无法调起微信收款确认页')
        }

        try {
          await requestMerchantTransferConfirm(packageInfo)
          Taro.showToast({
            title: '已调起收款确认页',
            icon: 'success'
          })
        } catch (e: any) {
          const msg = String(e?.errMsg || e?.message || '')
          if (/cancel/i.test(msg)) {
            Taro.showToast({title: '已取消收款确认', icon: 'none'})
          } else {
            // Keep the original WeChat error for troubleshooting (e.g. "商户号错误").
            throw new Error(msg || '调起收款确认页失败，请稍后重试')
          }
        }
      } else {
        await addShopDealerWithdraw(withdrawData)
        Taro.showToast({
          title: '提现申请已提交',
          icon: 'success'
        })
      }

      // 重置表单
      formRef.current?.resetFields()
      setSelectedAccount('')

      // 刷新数据
      await handleRefresh()

      // 切换到提现记录页面
      setActiveTab('1')

    } catch (error: any) {
      console.error('提现申请失败:', error)
      Taro.showToast({
        title: error.message || '提现申请失败',
        icon: 'error'
      })
    } finally {
      setSubmitting(false)
    }
  }

  const quickAmounts = ['1','100', '300', '500', '1000']

  const setQuickAmount = (amount: string) => {
    formRef.current?.setFieldsValue({amount})
  }

  const setAllAmount = () => {
    formRef.current?.setFieldsValue({amount: normalizeMoneyString(availableAmount).replace(/,/g, '')})
  }

  // 格式化金额
  const formatMoney = (money?: unknown) => {
    const n = parseFloat(normalizeMoneyString(money).replace(/,/g, ''))
    return Number.isFinite(n) ? n.toFixed(2) : '0.00'
  }

  const renderWithdrawForm = () => (
    <View>
      {/* 余额卡片 */}
      <View className="rounded-xl p-6 mb-6 text-white relative overflow-hidden" style={{
        background: businessGradients.dealer.header
      }}>
        {/* 装饰背景 - 小程序兼容版本 */}
        <View className="absolute top-0 right-0 w-24 h-24 rounded-full" style={{
          backgroundColor: 'rgba(255, 255, 255, 0.1)',
          right: '-12px',
          top: '-12px'
        }}></View>

        <View className="flex items-center justify-between relative z-10">
          <View className={'flex flex-col'}>
            <Text className="text-2xl font-bold text-white">{formatMoney(dealerUser?.money)}</Text>
            <Text className="text-white text-opacity-80 text-sm mb-1">可提现余额</Text>
          </View>
          <View className="p-3 rounded-full" style={{
            background: 'rgba(255, 255, 255, 0.2)'
          }}>
            <Wallet color="white" size="32"/>
          </View>
        </View>
        <View className="mt-4 pt-4 relative z-10" style={{
          borderTop: '1px solid rgba(255, 255, 255, 0.3)'
        }}>
          <Text className="text-white text-opacity-80 text-xs">
            最低提现金额：¥100 | 手续费：免费
          </Text>
        </View>
      </View>

      <Form
        ref={formRef}
        onFinish={handleSubmit}
        labelPosition="top"
      >
        <CellGroup>
          <Form.Item name="amount" label="提现金额" required>
            <Input
              placeholder="请输入提现金额"
              type="number"
              onChange={(value) => {
                // 实时验证提现金额
                const amount = parseFloat(String(value))
                const available = parseFloat(normalizeMoneyString(availableAmount).replace(/,/g, ''))
                if (!isNaN(amount) && amount > available) {
                  // 可以在这里添加实时提示，但不阻止输入
                }
              }}
            />
          </Form.Item>

          {/* 快捷金额 */}
          <View className="px-4 py-2">
            <Text className="text-sm text-gray-600 mb-2">快捷金额</Text>
            <View className="flex flex-wrap gap-2">
              {quickAmounts.map(amount => (
                <Button
                  key={amount}
                  size="small"
                  fill="outline"
                  onClick={() => setQuickAmount(amount)}
                >
                  {amount}
                </Button>
              ))}
              <Button
                size="small"
                fill="outline"
                onClick={setAllAmount}
              >
                全部
              </Button>
            </View>
          </View>

          <Form.Item name="accountType" label="提现方式" required>
            <Radio.Group
              value={selectedAccount}
              onChange={(value) => {
                const next = String(value)
                setSelectedAccount(next)
                // Ensure Form gets the field value even when Radio.Group is controlled.
                formRef.current?.setFieldsValue({accountType: next})
              }}
            >
              <Cell.Group>
                <Cell>
                  <Radio value="wechat">微信钱包</Radio>
                </Cell>
                <Cell>
                  <Radio value="alipay">支付宝</Radio>
                </Cell>
                <Cell>
                  <Radio value="bank">银行卡</Radio>
                </Cell>
              </Cell.Group>
            </Radio.Group>
          </Form.Item>

          {selectedAccount === 'alipay' && (
            <>
              <Form.Item name="account" label="支付宝账号" required>
                <Input placeholder="请输入支付宝账号"/>
              </Form.Item>
              <Form.Item name="accountName" label="支付宝姓名" required>
                <Input placeholder="请输入支付宝实名姓名"/>
              </Form.Item>
            </>
          )}

          {selectedAccount === 'bank' && (
            <>
              <Form.Item name="bankName" label="开户银行" required>
                <Input placeholder="请输入开户银行名称"/>
              </Form.Item>
              <Form.Item name="account" label="银行卡号" required>
                <Input placeholder="请输入银行卡号"/>
              </Form.Item>
              <Form.Item name="accountName" label="开户姓名" required>
                <Input placeholder="请输入银行卡开户姓名"/>
              </Form.Item>
            </>
          )}

          {selectedAccount === 'wechat' && (
            <View className="px-4 py-2">
              <Text className="text-sm text-gray-500">
                提交后将拉起微信收款确认页，需要您点击“确认收款”后才会完成转账
              </Text>
            </View>
          )}
        </CellGroup>

        <View className="mt-6 px-4">
          <Button
            block
            type="primary"
            nativeType="submit"
            loading={submitting}
            disabled={submitting || !selectedAccount}
          >
            {submitting ? '提交中...' : '申请提现'}
          </Button>
        </View>
      </Form>
    </View>
  )

  const renderWithdrawRecords = () => {
    console.log('渲染提现记录:', {loading, recordsCount: withdrawRecords.length, dealerUserId: dealerUser?.userId})

    return (
      <PullToRefresh
        disabled={refreshing}
        onRefresh={handleRefresh}
      >
        <View>
          {loading ? (
            <View className="text-center py-8">
              <Loading/>
              <Text className="text-gray-500 mt-2">加载中...</Text>
            </View>
          ) : withdrawRecords.length > 0 ? (
            withdrawRecords.map(record => (
              <View key={record.id} className="rounded-lg bg-gray-50 p-4 mb-3 shadow-sm">
                <View className="flex justify-between items-start mb-3">
                  <Space>
                    <Text className="font-semibold text-gray-800 mb-1">
                      提现金额：¥{record.money}
                    </Text>
                    <Text className="text-sm text-gray-500">
                      提现账户：{record.accountDisplay}
                    </Text>
                  </Space>
                  <Tag type={getStatusColor(record.applyStatus)}>
                    {getStatusText(record.applyStatus)}
                  </Tag>
                </View>

                <View className="text-xs text-gray-400">
                  <Text>申请时间：{record.createTime}</Text>
                  {record.auditTime && (
                    <Text className="block mt-1">
                      审核时间：{new Date(record.auditTime).toLocaleString()}
                    </Text>
                  )}
                  {record.rejectReason && (
                    <Text className="block mt-1 text-red-500">
                      驳回原因：{record.rejectReason}
                    </Text>
                  )}
                </View>
              </View>
            ))
          ) : (
            <Empty description="暂无提现记录"/>
          )}
        </View>
      </PullToRefresh>
    )
  }

  if (!dealerUser) {
    return (
      <View className="bg-gray-50 min-h-screen flex items-center justify-center">
        <Loading/>
        <Text className="text-gray-500 mt-2">加载中...</Text>
      </View>
    )
  }

  return (
    <View className="bg-gray-50 min-h-screen">
      <Tabs value={activeTab} onChange={handleTabChange}>
        <Tabs.TabPane title="申请提现" value="0">
          {renderWithdrawForm()}
        </Tabs.TabPane>

        <Tabs.TabPane title="提现记录" value="1">
          {renderWithdrawRecords()}
        </Tabs.TabPane>
      </Tabs>
    </View>
  )
}

export default DealerWithdraw