'use client'

import * as React from 'react'
import { Card, CardContent, CardHeader } from '@/components/ui/card'
import { Accordion, AccordionContent, AccordionItem, AccordionTrigger } from '@/components/ui/accordion'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { Button } from '@/components/ui/button'
import { Checkbox } from '@/components/ui/checkbox'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table'
import {
  Package,
  Plus,
  Trash2,
} from 'lucide-react'
import { toast } from 'sonner'
import { updateContractItems, getContractItems } from '../service'
import { Save, LoaderIcon } from 'lucide-react'

interface ContractItem {
  id?: number
  itemCode: string
  itemInfo: string
  specification: string
  quantity: number
  quantityUnit: string
  totalWeight: number
  weightUnit: string
  contractDeliveryDate: string
  contractUnitPrice: number
  contractAmount: number
  contractCurrency: string
  isSelected?: boolean
  [key: string]: unknown
}

interface ContractItemsTableProps {
  contractId: number
  items: ContractItem[]
  onItemsChange: (items: ContractItem[]) => void
  onTotalAmountChange: (total: number) => void
  availableBudget?: number
  readOnly?: boolean
}

// 통화 목록
const CURRENCIES = ["USD", "EUR", "KRW", "JPY", "CNY"];

// 수량 단위 목록
const QUANTITY_UNITS = ["KG", "TON", "EA", "M", "M2", "M3", "L", "ML", "G", "SET", "PCS"];

// 중량 단위 목록
const WEIGHT_UNITS = ["KG", "TON", "G", "LB", "OZ"];

export function ContractItemsTable({
  contractId,
  items,
  onItemsChange,
  onTotalAmountChange,
  availableBudget = 0,
  readOnly = false
}: ContractItemsTableProps) {
  const [localItems, setLocalItems] = React.useState<ContractItem[]>(items)
  const [isSaving, setIsSaving] = React.useState(false)
  const [isLoading, setIsLoading] = React.useState(false)
  const [isEnabled, setIsEnabled] = React.useState(true)

  // 초기 데이터 로드
  React.useEffect(() => {
    const loadItems = async () => {
      try {
        setIsLoading(true)
        const fetchedItems = await getContractItems(contractId)
        const formattedItems = fetchedItems.map(item => ({
          id: item.id,
          itemCode: item.itemCode || '',
          itemInfo: item.itemInfo || '',
          specification: item.specification || '',
          quantity: Number(item.quantity) || 0,
          quantityUnit: item.quantityUnit || 'EA',
          totalWeight: Number(item.totalWeight) || 0,
          weightUnit: item.weightUnit || 'KG',
          contractDeliveryDate: item.contractDeliveryDate || '',
          contractUnitPrice: Number(item.contractUnitPrice) || 0,
          contractAmount: Number(item.contractAmount) || 0,
          contractCurrency: item.contractCurrency || 'KRW',
          isSelected: false
        })) as ContractItem[]
        setLocalItems(formattedItems as ContractItem[])
        onItemsChange(formattedItems as ContractItem[])
      } catch (error) {
        console.error('Error loading contract items:', error)
        // 기본 빈 배열로 설정
        setLocalItems([])
        onItemsChange([])
      } finally {
        setIsLoading(false)
      }
    }

    loadItems()
  }, [contractId, onItemsChange])

  // 로컬 상태와 부모 상태 동기화 (초기 로드 후에는 부모 상태 우선)
  React.useEffect(() => {
    if (items.length > 0) {
      setLocalItems(items)
    }
  }, [items])

  const handleSaveItems = async () => {
    try {
      setIsSaving(true)
      
      // validation 체크
      const errors: string[] = []
      for (let index = 0; index < localItems.length; index++) {
        const item = localItems[index]
        if (!item.itemCode) errors.push(`${index + 1}번째 품목의 품목코드`)
        if (!item.itemInfo) errors.push(`${index + 1}번째 품목의 Item 정보`)
        if (!item.quantity || item.quantity <= 0) errors.push(`${index + 1}번째 품목의 수량`)
        if (!item.contractUnitPrice || item.contractUnitPrice <= 0) errors.push(`${index + 1}번째 품목의 단가`)
        if (!item.contractDeliveryDate) errors.push(`${index + 1}번째 품목의 납기일`)
      }
      
      if (errors.length > 0) {
        toast.error(`다음 항목을 입력해주세요: ${errors.join(', ')}`)
        return
      }
      
      await updateContractItems(contractId, localItems as any)
      toast.success('품목정보가 저장되었습니다.')
    } catch (error) {
      console.error('Error saving contract items:', error)
      toast.error('품목정보 저장 중 오류가 발생했습니다.')
    } finally {
      setIsSaving(false)
    }
  }

  // 총 금액 계산
  const totalAmount = localItems.reduce((sum, item) => sum + item.contractAmount, 0)
  const totalQuantity = localItems.reduce((sum, item) => sum + item.quantity, 0)
  const totalUnitPrice = localItems.reduce((sum, item) => sum + item.contractUnitPrice, 0)
  const amountDifference = availableBudget - totalAmount
  const budgetRatio = availableBudget > 0 ? (totalAmount / availableBudget) * 100 : 0

  // 부모 컴포넌트에 총 금액 전달
  React.useEffect(() => {
    onTotalAmountChange(totalAmount)
  }, [totalAmount, onTotalAmountChange])

  // 아이템 업데이트
  const updateItem = (index: number, field: keyof ContractItem, value: string | number | boolean | undefined) => {
    const updatedItems = [...localItems]
    updatedItems[index] = { ...updatedItems[index], [field]: value }
    
    // 단가나 수량이 변경되면 금액 자동 계산
    if (field === 'contractUnitPrice' || field === 'quantity') {
      const item = updatedItems[index]
      updatedItems[index].contractAmount = item.contractUnitPrice * item.quantity
    }
    
    setLocalItems(updatedItems)
    onItemsChange(updatedItems)
  }

  // 행 추가
  const addRow = () => {
    const newItem: ContractItem = {
      itemCode: '',
      itemInfo: '',
      specification: '',
      quantity: 0,
      quantityUnit: 'EA', // 기본 수량 단위
      totalWeight: 0,
      weightUnit: 'KG', // 기본 중량 단위
      contractDeliveryDate: '',
      contractUnitPrice: 0,
      contractAmount: 0,
      contractCurrency: 'KRW', // 기본 통화
      isSelected: false
    }
    const updatedItems = [...localItems, newItem]
    setLocalItems(updatedItems)
    onItemsChange(updatedItems)
  }

  // 선택된 행 삭제
  const deleteSelectedRows = () => {
    const selectedIndices = localItems
      .map((item, index) => item.isSelected ? index : -1)
      .filter(index => index !== -1)
    
    if (selectedIndices.length === 0) {
      toast.error("삭제할 행을 선택해주세요.")
      return
    }

    const updatedItems = localItems.filter((_, index) => !selectedIndices.includes(index))
    setLocalItems(updatedItems)
    onItemsChange(updatedItems)
    toast.success(`${selectedIndices.length}개 행이 삭제되었습니다.`)
  }

  // 전체 선택/해제
  const toggleSelectAll = (checked: boolean) => {
    const updatedItems = localItems.map(item => ({ ...item, isSelected: checked }))
    setLocalItems(updatedItems)
    onItemsChange(updatedItems)
  }


  // 통화 포맷팅
  const formatCurrency = (amount: number, currency: string = 'KRW') => {
    return new Intl.NumberFormat('ko-KR', {
      style: 'currency',
      currency: currency,
    }).format(amount)
  }

  const allSelected = localItems.length > 0 && localItems.every(item => item.isSelected)
  const someSelected = localItems.some(item => item.isSelected)

  if (isLoading) {
    return (
      <Accordion type="single" collapsible className="w-full">
        <AccordionItem value="items">
          <AccordionTrigger className="hover:no-underline">
            <div className="flex items-center gap-2">
              <Package className="w-5 h-5" />
              <span>품목 정보</span>
              <span className="text-sm text-gray-500">(로딩 중...)</span>
            </div>
          </AccordionTrigger>
          <AccordionContent>
            <div className="flex items-center justify-center py-8">
              <LoaderIcon className="w-6 h-6 animate-spin mr-2" />
              <span>품목 정보를 불러오는 중...</span>
            </div>
          </AccordionContent>
        </AccordionItem>
      </Accordion>
    )
  }

  return (
    <Accordion type="single" collapsible className="w-full">
      <AccordionItem value="items">
        <AccordionTrigger className="hover:no-underline">
          <div className="flex items-center gap-3 w-full">
            <Package className="w-5 h-5" />
            <span className="font-medium">품목 정보</span>
            <span className="text-sm text-gray-500">({localItems.length}개 품목)</span>
          </div>
        </AccordionTrigger>
        <AccordionContent>
          <Card>
            <CardHeader>
              {/* 체크박스 */}
              <div className="flex items-center gap-2 mb-4">
                <Checkbox 
                  checked={isEnabled}
                  onCheckedChange={(checked) => setIsEnabled(checked as boolean)}
                  disabled={readOnly}
                />
                <span className="text-sm font-medium">품목 정보 활성화</span>
              </div>
              
              <div className="flex items-center justify-between">
                <div className="flex items-center gap-2">
                  <span className="text-sm text-gray-600">총 금액: {formatCurrency(totalAmount, localItems[0]?.contractCurrency || 'KRW')}</span>
                  <span className="text-sm text-gray-600">총 수량: {totalQuantity.toLocaleString()}</span>
                </div>
                {!readOnly && (
                  <div className="flex items-center gap-2">
                    <Button
                      variant="outline"
                      size="sm"
                      onClick={addRow}
                      disabled={!isEnabled}
                      className="flex items-center gap-2"
                    >
                      <Plus className="w-4 h-4" />
                      행 추가
                    </Button>
                    <Button
                      variant="outline"
                      size="sm"
                      onClick={deleteSelectedRows}
                      disabled={!isEnabled}
                      className="flex items-center gap-2 text-red-600 hover:text-red-700"
                    >
                      <Trash2 className="w-4 h-4" />
                      행 삭제
                    </Button>
                    <Button
                      onClick={handleSaveItems}
                      disabled={isSaving || !isEnabled}
                      className="flex items-center gap-2"
                    >
                      {isSaving ? (
                        <LoaderIcon className="w-4 h-4 animate-spin" />
                      ) : (
                        <Save className="w-4 h-4" />
                      )}
                      품목정보 저장
                    </Button>
                  </div>
                )}
        </div>
        
        {/* 요약 정보 */}
        <div className="grid grid-cols-2 md:grid-cols-4 gap-4 mt-4">
          <div className="space-y-1">
            <Label className="text-sm font-medium">총 계약금액</Label>
            <div className="text-lg font-bold text-primary">
              {formatCurrency(totalAmount, localItems[0]?.contractCurrency || 'KRW')}
            </div>
          </div>
          <div className="space-y-1">
            <Label className="text-sm font-medium">가용예산</Label>
            <div className="text-lg font-bold">
              {formatCurrency(availableBudget, localItems[0]?.contractCurrency || 'KRW')}
            </div>
          </div>
          <div className="space-y-1">
            <Label className="text-sm font-medium">가용예산 比 (금액차)</Label>
            <div className={`text-lg font-bold ${amountDifference >= 0 ? 'text-green-600' : 'text-red-600'}`}>
              {formatCurrency(amountDifference, localItems[0]?.contractCurrency || 'KRW')}
            </div>
          </div>
          <div className="space-y-1">
            <Label className="text-sm font-medium">가용예산 比 (비율)</Label>
            <div className={`text-lg font-bold ${budgetRatio <= 100 ? 'text-green-600' : 'text-red-600'}`}>
              {budgetRatio.toFixed(1)}%
            </div>
          </div>
        </div>
      </CardHeader>
      
      <CardContent>
        <div className="overflow-x-auto">
          <Table>
            <TableHeader>
              <TableRow className="border-b-2">
                <TableHead className="w-12 px-2">
                  {!readOnly && (
                    <Checkbox
                      checked={allSelected}
                      ref={(el) => {
                        if (el) (el as HTMLInputElement & { indeterminate?: boolean }).indeterminate = someSelected && !allSelected
                      }}
                      onCheckedChange={toggleSelectAll}
                      disabled={!isEnabled}
                    />
                  )}
                </TableHead>
                <TableHead className="px-3 py-3 font-semibold">품목코드 (PKG No.)</TableHead>
                <TableHead className="px-3 py-3 font-semibold">Item 정보 (자재그룹 / 자재코드)</TableHead>
                <TableHead className="px-3 py-3 font-semibold">규격</TableHead>
                <TableHead className="px-3 py-3 font-semibold text-right">수량</TableHead>
                <TableHead className="px-3 py-3 font-semibold">수량단위</TableHead>
                <TableHead className="px-3 py-3 font-semibold text-right">총 중량</TableHead>
                <TableHead className="px-3 py-3 font-semibold">중량단위</TableHead>
                <TableHead className="px-3 py-3 font-semibold">계약납기일</TableHead>
                <TableHead className="px-3 py-3 font-semibold text-right">계약단가</TableHead>
                <TableHead className="px-3 py-3 font-semibold text-right">계약금액</TableHead>
                <TableHead className="px-3 py-3 font-semibold">계약통화</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {localItems.map((item, index) => (
                <TableRow key={index} className="hover:bg-muted/30 transition-colors">
                  <TableCell className="px-2">
                    {!readOnly && (
                      <Checkbox
                        checked={item.isSelected || false}
                        onCheckedChange={(checked) =>
                          updateItem(index, 'isSelected', checked)
                        }
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm">{item.itemCode || '-'}</span>
                    ) : (
                      <Input
                        value={item.itemCode}
                        onChange={(e) => updateItem(index, 'itemCode', e.target.value)}
                        placeholder="품목코드"
                        className="h-8 text-sm"
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm">{item.itemInfo || '-'}</span>
                    ) : (
                      <Input
                        value={item.itemInfo}
                        onChange={(e) => updateItem(index, 'itemInfo', e.target.value)}
                        placeholder="Item 정보"
                        className="h-8 text-sm"
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm">{item.specification || '-'}</span>
                    ) : (
                      <Input
                        value={item.specification}
                        onChange={(e) => updateItem(index, 'specification', e.target.value)}
                        placeholder="규격"
                        className="h-8 text-sm"
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm text-right">{item.quantity.toLocaleString()}</span>
                    ) : (
                      <Input
                        type="number"
                        value={item.quantity}
                        onChange={(e) => updateItem(index, 'quantity', parseFloat(e.target.value) || 0)}
                        className="h-8 text-sm text-right"
                        placeholder="0"
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm">{item.quantityUnit || '-'}</span>
                    ) : (
                      <Select
                        value={item.quantityUnit}
                        onValueChange={(value) => updateItem(index, 'quantityUnit', value)}
                        disabled={!isEnabled}
                      >
                        <SelectTrigger className="h-8 text-sm w-20">
                          <SelectValue />
                        </SelectTrigger>
                        <SelectContent>
                          {QUANTITY_UNITS.map((unit) => (
                            <SelectItem key={unit} value={unit}>
                              {unit}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm text-right">{item.totalWeight.toLocaleString()}</span>
                    ) : (
                      <Input
                        type="number"
                        value={item.totalWeight}
                        onChange={(e) => updateItem(index, 'totalWeight', parseFloat(e.target.value) || 0)}
                        className="h-8 text-sm text-right"
                        placeholder="0"
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm">{item.weightUnit || '-'}</span>
                    ) : (
                      <Select
                        value={item.weightUnit}
                        onValueChange={(value) => updateItem(index, 'weightUnit', value)}
                        disabled={!isEnabled}
                      >
                        <SelectTrigger className="h-8 text-sm w-20">
                          <SelectValue />
                        </SelectTrigger>
                        <SelectContent>
                          {WEIGHT_UNITS.map((unit) => (
                            <SelectItem key={unit} value={unit}>
                              {unit}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm">{item.contractDeliveryDate || '-'}</span>
                    ) : (
                      <Input
                        type="date"
                        value={item.contractDeliveryDate}
                        onChange={(e) => updateItem(index, 'contractDeliveryDate', e.target.value)}
                        className="h-8 text-sm"
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm text-right">{item.contractUnitPrice.toLocaleString()}</span>
                    ) : (
                      <Input
                        type="number"
                        value={item.contractUnitPrice}
                        onChange={(e) => updateItem(index, 'contractUnitPrice', parseFloat(e.target.value) || 0)}
                        className="h-8 text-sm text-right"
                        placeholder="0"
                        disabled={!isEnabled}
                      />
                    )}
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    <div className="font-semibold text-primary text-right text-sm">
                      {formatCurrency(item.contractAmount)}
                    </div>
                  </TableCell>
                  <TableCell className="px-3 py-3">
                    {readOnly ? (
                      <span className="text-sm">{item.contractCurrency || '-'}</span>
                    ) : (
                      <Select
                        value={item.contractCurrency}
                        onValueChange={(value) => updateItem(index, 'contractCurrency', value)}
                        disabled={!isEnabled}
                      >
                        <SelectTrigger className="h-8 text-sm w-20">
                          <SelectValue />
                        </SelectTrigger>
                        <SelectContent>
                          {CURRENCIES.map((currency) => (
                            <SelectItem key={currency} value={currency}>
                              {currency}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                    )}
                  </TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        </div>

        {/* 합계 정보 */}
        {localItems.length > 0 && (
          <div className="mt-6 flex justify-end">
            <Card className="w-80 bg-gradient-to-r from-primary/5 to-primary/10 border-primary/20">
              <CardContent className="p-6">
                <div className="space-y-4">
                  <div className="flex items-center justify-between">
                    <span className="text-sm font-medium text-muted-foreground">총 수량</span>
                    <span className="text-lg font-semibold">
                      {totalQuantity.toLocaleString()} {localItems[0]?.quantityUnit || 'KG'}
                    </span>
                  </div>
                  <div className="flex items-center justify-between">
                    <span className="text-sm font-medium text-muted-foreground">총 단가</span>
                    <span className="text-lg font-semibold">
                      {formatCurrency(totalUnitPrice, localItems[0]?.contractCurrency || 'KRW')}
                    </span>
                  </div>
                  <div className="border-t pt-4">
                    <div className="flex items-center justify-between">
                      <span className="text-xl font-bold text-primary">합계 금액</span>
                      <span className="text-2xl font-bold text-primary">
                        {formatCurrency(totalAmount, localItems[0]?.contractCurrency || 'KRW')}
                      </span>
                    </div>
                  </div>
                </div>
              </CardContent>
            </Card>
          </div>
        )}
            </CardContent>
          </Card>
        </AccordionContent>
      </AccordionItem>
    </Accordion>
  )
}