import React, { useState, useEffect, useMemo } from 'react'
import {
  Card, Row, Col, Statistic, Select, message, Spin, Progress, Typography, Tabs, Table, Modal, Tag, DatePicker, Space
} from 'antd'
import { RiseOutlined, FallOutlined, UnorderedListOutlined, BarChartOutlined } from '@ant-design/icons'
import { useLanguageStore } from '../store/languageStore'
import apiClient from '../utils/request'
import dayjs from 'dayjs'

const { Title } = Typography
const { RangePicker } = DatePicker

const ProjectCostPage: React.FC = () => {
  const { t } = useLanguageStore()

  const LEVEL2_LABELS = useMemo(() => ({
    contract_payment: t('finance.projectRevenue'),
    deposit_refund: t('finance.warrantyReturn'),
    shareholder_investment: t('finance.shareholderInvestment'),
    other_income: t('finance.otherIncome'),
    customer_advance: t('cash.customerAdvance'),
    bank_loan: t('cash.bankLoan'),
    other_loan: t('cash.otherLoan'),
    dividend_income: t('cash.dividendIncome'),
    interest_income: t('cash.interestIncome'),
    asset_disposal: t('cash.assetDisposal'),
    tax_refund: t('cash.taxRefund'),
    government_subsidy: t('cash.governmentSubsidy'),
    material: t('finance.materialPurchase'),
    equipment: t('finance.equipmentPurchase'),
    subcontract: t('finance.constructionSubcontract'),
    construction_subcontract: t('finance.constructionSubcontract'),
    labor: t('finance.laborWage'),
    travel: t('finance.travelTransport'),
    accommodation: t('finance.accommodationFood'),
    freight: t('finance.transportLogistics'),
    transport_logistics: t('finance.transportLogistics'),
    design: t('finance.surveyDesign'),
    survey_design: t('finance.surveyDesign'),
    tools: t('finance.smallTools'),
    client_relations: t('finance.customerEDLRelation'),
    customer_edl: t('finance.customerEDLRelation'),
    other_project: t('finance.otherProjectExpense'),
    salary: t('finance.salaryWelfare'),
    rent: t('finance.rentProperty'),
    office: t('finance.officeExpense'),
    commute: t('finance.commute'),
    vehicle_maintenance: t('finance.vehicleMaintenance'),
    assets: t('finance.fixedAsset'),
    marketing: t('finance.marketing'),
    entertainment: t('finance.entertainment'),
    welfare: t('finance.employeeBenefit'),
    logistics: t('finance.expressLogistics'),
    other_company: t('finance.otherCompanyExpense'),
    loan_repayment: t('cash.loanRepayment'),
    interest_expense: t('cash.interestExpense'),
    dividend_payment: t('cash.dividendPayment'),
    tax_payment: t('cash.taxPayment'),
    deposit_payment: t('cash.depositPayment'),
    owner_expense: t('cash.ownerExpense'),
    other_finance: t('cash.otherFinance'),
  }), [t])

  const LEVEL1_LABELS = useMemo(() => ({
    income: t('finance.incomeCategory'),
    project: t('finance.projectExpense'),
    company: t('finance.companyExpense'),
    finance: t('cash.financeExpense'),
  }), [t])

  const COUNTERPARTY_LABELS = useMemo(() => ({
    supplier: t('finance.counterpartySupplier'),
    subcontractor: t('finance.counterpartySubcontractor'),
    customer: t('finance.counterpartyCustomer'),
    employee: t('finance.counterpartyEmployee'),
    logistics: t('finance.counterpartyLogistics'),
    shareholder: t('finance.counterpartyShareholder'),
    bank: t('cash.counterpartyBank'),
    other: t('finance.counterpartyOther'),
  }), [t])

  const SOURCE_LABELS = useMemo(() => ({
    manual: t('finance.manual'),
    cash_management: t('cash.sourceLabel'),
    receipt: t('cash.receiptSource'),
    advance: t('finance.advance'),
    reimbursement: t('finance.reimbursement'),
    material: t('finance.material'),
    primary_freight: t('finance.freight'),
    secondary_freight: t('finance.freight'),
  }), [t])

  const [projects, setProjects] = useState<any[]>([])
  const [selectedProjectId, setSelectedProjectId] = useState<number | null>(null)
  const [costSummary, setCostSummary] = useState<any>(null)
  const [loading, setLoading] = useState(false)
  const [activeTab, setActiveTab] = useState('overview')

  const [details, setDetails] = useState<any[]>([])
  const [detailPagination, setDetailPagination] = useState({ page: 1, pageSize: 20, total: 0 })
  const [detailLoading, setDetailLoading] = useState(false)
  const [detailFilter, setDetailFilter] = useState<any>({})
  const [detailDateRange, setDetailDateRange] = useState<[dayjs.Dayjs | null, dayjs.Dayjs | null] | null>(null)

  const [modalVisible, setModalVisible] = useState(false)
  const [modalTitle, setModalTitle] = useState('')
  const [modalRecords, setModalRecords] = useState<any[]>([])
  const [modalPagination, setModalPagination] = useState({ page: 1, pageSize: 20, total: 0 })
  const [modalLoading, setModalLoading] = useState(false)
  const [modalFilter, setModalFilter] = useState<any>({})

  useEffect(() => {
    apiClient.get('/projects', { params: { pageSize: 200 } }).then(res => {
      if (res.data.success) setProjects(res.data.data || res.data.projects || [])
    }).catch(() => {})
  }, [])

  useEffect(() => {
    if (selectedProjectId) {
      setLoading(true)
      apiClient.get(`/projects/${selectedProjectId}/cost-summary`).then(res => {
        if (res.data.success) setCostSummary(res.data.data)
        else { message.error(t('projectCost.getDataFailed')); setCostSummary(null) }
      }).catch(() => { message.error(t('projectCost.getDataFailed')); setCostSummary(null) })
      .finally(() => setLoading(false))
    } else {
      setCostSummary(null)
    }
  }, [selectedProjectId])

  const fetchDetails = async (page = 1, filters?: any) => {
    if (!selectedProjectId) return
    setDetailLoading(true)
    try {
      const params: any = { page, pageSize: detailPagination.pageSize, ...filters }
      if (detailDateRange && detailDateRange[0]) {
        params.date_from = detailDateRange[0].format('YYYY-MM-DD')
        params.date_to = detailDateRange[1]?.format('YYYY-MM-DD')
      }
      const res = await apiClient.get(`/projects/${selectedProjectId}/financial-details`, { params })
      if (res.data.success) {
        setDetails(res.data.data)
        setDetailPagination(res.data.pagination)
      }
    } catch (e) { console.error(e) }
    setDetailLoading(false)
  }

  const fetchModalRecords = async (page = 1) => {
    if (!selectedProjectId) return
    setModalLoading(true)
    try {
      const params: any = { page, pageSize: modalPagination.pageSize, ...modalFilter }
      const res = await apiClient.get(`/projects/${selectedProjectId}/financial-details`, { params })
      if (res.data.success) {
        setModalRecords(res.data.data)
        setModalPagination(res.data.pagination)
      }
    } catch (e) { console.error(e) }
    setModalLoading(false)
  }

  useEffect(() => {
    if (activeTab === 'details' && selectedProjectId) {
      fetchDetails(1, detailFilter)
    }
  }, [activeTab, selectedProjectId, detailDateRange])

  const handleCategoryClick = (txnType: string, categoryLevel2: string) => {
    const label = LEVEL2_LABELS[categoryLevel2] || categoryLevel2
    setModalTitle(`${label} - ${txnType === 'income' ? t('finance.income') : t('finance.expense')}${t('projectCost.detail')}`)
    const filter = { txn_type: txnType, category_level2: categoryLevel2 }
    setModalFilter(filter)
    setModalPagination(prev => ({ ...prev, page: 1, total: 0 }))
    setModalVisible(true)
    setModalLoading(true)
    apiClient.get(`/projects/${selectedProjectId}/financial-details`, { params: { page: 1, pageSize: 20, ...filter } })
      .then(res => {
        if (res.data.success) {
          setModalRecords(res.data.data)
          setModalPagination(res.data.pagination)
        }
      })
      .catch(() => message.error(t('projectCost.getDataFailed')))
      .finally(() => setModalLoading(false))
  }

  const profitRate = costSummary && costSummary.income?.total > 0
    ? ((costSummary.profit / costSummary.income.total) * 100).toFixed(1) : '0.0'
  const costRate = costSummary && costSummary.contract_amount > 0
    ? ((costSummary.total_cost / costSummary.contract_amount) * 100).toFixed(1) : '0.0'

  const detailColumns = [
    { title: t('finance.date'), dataIndex: 'record_date', width: 100, render: (v: string) => v?.slice(0, 10) },
    { title: t('finance.incomeType'), dataIndex: 'txn_type', width: 60, render: (v: string) => <Tag color={v === 'income' ? 'green' : 'red'}>{v === 'income' ? t('finance.income') : t('finance.expense')}</Tag> },
    { title: t('finance.level2Category'), dataIndex: 'category_level2', width: 100, render: (v: string) => LEVEL2_LABELS[v] || v },
    { title: t('finance.amount'), dataIndex: 'amount_original', width: 100, render: (v: number) => v?.toLocaleString(), align: 'right' as const },
    { title: t('finance.currency'), dataIndex: 'currency', width: 50 },
    { title: t('finance.equivalentCNY'), dataIndex: 'amount_cny', width: 110, render: (v: number) => `¥${v?.toLocaleString()}`, align: 'right' as const },
    { title: t('finance.counterpartyName'), dataIndex: 'counterparty_name', width: 100, ellipsis: true },
    { title: t('finance.desc'), dataIndex: 'description', ellipsis: true },
    { title: t('finance.source'), dataIndex: 'source', width: 80, render: (v: string) => <Tag>{SOURCE_LABELS[v] || v}</Tag> },
  ]

  const modalColumns = [
    { title: t('finance.date'), dataIndex: 'record_date', width: 100, render: (v: string) => v?.slice(0, 10) },
    { title: t('finance.amount'), dataIndex: 'amount_original', width: 110, render: (v: number, r: any) => `${v?.toLocaleString()} ${r.currency}` },
    { title: t('finance.equivalentCNY'), dataIndex: 'amount_cny', width: 110, render: (v: number) => <b>¥{v?.toLocaleString()}</b>, align: 'right' as const },
    { title: t('finance.counterpartyName'), dataIndex: 'counterparty_name', width: 100, ellipsis: true },
    { title: t('finance.desc'), dataIndex: 'description', ellipsis: true },
    { title: t('finance.source'), dataIndex: 'source', width: 80, render: (v: string) => <Tag>{SOURCE_LABELS[v] || v}</Tag> },
  ]

  const renderOverview = () => {
    if (loading) return <div style={{ textAlign: 'center', padding: 40 }}><Spin size="large" /></div>
    if (!costSummary) return <div style={{ textAlign: 'center', padding: 40, color: '#999' }}>{t('projectCost.selectProject')}</div>

    return (
      <>
        <Row gutter={[16, 16]} style={{ marginBottom: 24 }}>
          <Col xs={12} sm={6}>
            <Card size="small">
              <Statistic title={t('projectCost.contractAmount')} value={costSummary.contract_amount} precision={2} prefix="¥" valueStyle={{ color: '#1890ff', fontSize: 20 }} />
            </Card>
          </Col>
          <Col xs={12} sm={6}>
            <Card size="small">
              <Statistic title={t('projectCost.totalIncome')} value={costSummary.income?.total} precision={2} prefix="¥" valueStyle={{ color: '#52c41a', fontSize: 20 }} />
            </Card>
          </Col>
          <Col xs={12} sm={6}>
            <Card size="small">
              <Statistic title={t('projectCost.totalExpense')} value={costSummary.total_cost} precision={2} prefix="¥" valueStyle={{ color: '#fa541c', fontSize: 20 }} />
            </Card>
          </Col>
          <Col xs={12} sm={6}>
            <Card size="small">
              <Statistic title={t('projectCost.profit')} value={costSummary.profit} precision={2} prefix="¥" valueStyle={{ color: costSummary.profit >= 0 ? '#52c41a' : '#ff4d4f', fontSize: 20 }} />
              <div style={{ fontSize: 12, color: '#999', marginTop: 4 }}>{t('projectCost.profitRate')}: {profitRate}%</div>
            </Card>
          </Col>
        </Row>

        <Card size="small" title={t('projectCost.costProgress')} style={{ marginBottom: 16 }}>
          <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: 4 }}>
            <span>{t('projectCost.costRatio')}</span>
            <span>{costRate}%</span>
          </div>
          <Progress percent={parseFloat(costRate)} strokeColor={parseFloat(costRate) > 80 ? '#ff4d4f' : parseFloat(costRate) > 60 ? '#faad14' : '#52c41a'} />
        </Card>

        <Row gutter={[16, 16]}>
          <Col xs={24} md={12}>
            <Card title={<span><RiseOutlined style={{ color: '#52c41a', marginRight: 8 }} />{t('projectCost.incomeBreakdown')}</span>} size="small">
              {costSummary.income && Object.keys(costSummary.income.by_category).length > 0 ? (
                Object.entries(costSummary.income.by_category).map(([category, amount]: [string, any]) => (
                  <div key={category} style={{ marginBottom: 12, cursor: 'pointer' }} onClick={() => handleCategoryClick('income', category)}>
                    <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: 4 }}>
                      <span style={{ color: '#1890ff', textDecoration: 'underline' }}>{LEVEL2_LABELS[category] || category}</span>
                      <span>¥{(amount || 0).toLocaleString(undefined, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}</span>
                    </div>
                    <Progress percent={costSummary.income.total > 0 ? (amount / costSummary.income.total) * 100 : 0} strokeColor="#52c41a" size="small" />
                  </div>
                ))
              ) : (
                <div style={{ textAlign: 'center', padding: 20, color: '#999' }}>{t('projectCost.noData')}</div>
              )}
            </Card>
          </Col>
          <Col xs={24} md={12}>
            <Card title={<span><FallOutlined style={{ color: '#fa541c', marginRight: 8 }} />{t('projectCost.expenseBreakdown')}</span>} size="small">
              {costSummary.expense && Object.keys(costSummary.expense.by_category).length > 0 ? (
                Object.entries(costSummary.expense.by_category).map(([category, amount]: [string, any]) => (
                  <div key={category} style={{ marginBottom: 12, cursor: 'pointer' }} onClick={() => handleCategoryClick('expense', category)}>
                    <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: 4 }}>
                      <span style={{ color: '#1890ff', textDecoration: 'underline' }}>{LEVEL2_LABELS[category] || category}</span>
                      <span>¥{(amount || 0).toLocaleString(undefined, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}</span>
                    </div>
                    <Progress percent={costSummary.expense.total > 0 ? (amount / costSummary.expense.total) * 100 : 0} strokeColor="#fa541c" size="small" />
                  </div>
                ))
              ) : (
                <div style={{ textAlign: 'center', padding: 20, color: '#999' }}>{t('projectCost.noData')}</div>
              )}
            </Card>
          </Col>
        </Row>

        {costSummary.expense && Object.keys(costSummary.expense.by_level1 || {}).length > 0 && (
          <Card title={t('projectCost.expenseByLevel1')} size="small" style={{ marginTop: 16 }}>
            <Row gutter={[16, 16]}>
              {Object.entries(costSummary.expense.by_level1).map(([level1, amount]: [string, any]) => (
                <Col xs={8} sm={8} key={level1}>
                  <Statistic title={LEVEL1_LABELS[level1] || level1} value={amount} precision={2} prefix="¥" valueStyle={{ fontSize: 16 }} />
                </Col>
              ))}
            </Row>
          </Card>
        )}
      </>
    )
  }

  const renderDetails = () => {
    if (!selectedProjectId) return <div style={{ textAlign: 'center', padding: 40, color: '#999' }}>{t('projectCost.selectProject')}</div>

    return (
      <>
        <div style={{ marginBottom: 16, display: 'flex', justifyContent: 'space-between', flexWrap: 'wrap', gap: 8 }}>
          <Space size="small" wrap>
            <RangePicker size="small" onChange={(dates) => setDetailDateRange(dates as any)} />
            <Select size="small" allowClear placeholder={t('finance.incomeType')} style={{ width: 100 }}
              onChange={(v) => { const f = { ...detailFilter, txn_type: v }; if (!v) delete f.txn_type; setDetailFilter(f); fetchDetails(1, f); }}
              options={[{ value: 'income', label: t('finance.income') }, { value: 'expense', label: t('finance.expense') }]}
            />
            <Select size="small" allowClear placeholder={t('finance.level1Category')} style={{ width: 120 }}
              onChange={(v) => { const f = { ...detailFilter, category_level1: v }; if (!v) delete f.category_level1; setDetailFilter(f); fetchDetails(1, f); }}
              options={[
                { value: 'income', label: t('finance.incomeCategory') },
                { value: 'project', label: t('finance.projectExpense') },
                { value: 'company', label: t('finance.companyExpense') },
                { value: 'finance', label: t('cash.financeExpense') },
              ]}
            />
          </Space>
        </div>

        <Card size="small" styles={{ body: { padding: 0 } }}>
          <Spin spinning={detailLoading}>
            <Table
              dataSource={details}
              columns={detailColumns}
              rowKey="id"
              size="small"
              scroll={{ x: 900 }}
              pagination={{
                current: detailPagination.page,
                pageSize: detailPagination.pageSize,
                total: detailPagination.total,
                onChange: (page) => fetchDetails(page, detailFilter),
                showTotal: (total) => t('finance.totalRecords', { total })
              }}
            />
          </Spin>
        </Card>
      </>
    )
  }

  const tabItems = [
    {
      key: 'overview',
      label: <span><BarChartOutlined /> {t('projectCost.overviewTab')}</span>,
      children: renderOverview(),
    },
    {
      key: 'details',
      label: <span><UnorderedListOutlined /> {t('projectCost.detailsTab')}</span>,
      children: renderDetails(),
    },
  ]

  return (
    <div style={{ padding: 24 }}>
      <Title level={3} style={{ marginBottom: 24 }}>{t('projectCost.title')}</Title>

      <Card style={{ marginBottom: 16 }}>
        <Select
          placeholder={t('projectCost.selectProject')}
          style={{ width: '100%', maxWidth: 500 }}
          showSearch optionFilterProp="label"
          value={selectedProjectId}
          onChange={setSelectedProjectId}
          options={projects.map(p => ({ value: p.id, label: p.name }))}
        />
      </Card>

      <Tabs activeKey={activeTab} onChange={setActiveTab} items={tabItems} type="card" />

      <Modal
        title={modalTitle}
        open={modalVisible}
        onCancel={() => setModalVisible(false)}
        footer={null}
        width={800}
        destroyOnClose
      >
        <Spin spinning={modalLoading}>
          <Table
            dataSource={modalRecords}
            columns={modalColumns}
            rowKey="id"
            size="small"
            scroll={{ x: 700 }}
            pagination={{
              current: modalPagination.page,
              pageSize: modalPagination.pageSize,
              total: modalPagination.total,
              onChange: (page) => fetchModalRecords(page),
              showTotal: (total) => t('finance.totalRecords', { total })
            }}
          />
        </Spin>
      </Modal>
    </div>
  )
}

export default ProjectCostPage