'use client'

import { useState, useEffect } from 'react'
import { useParams } from 'next/navigation'
import Link from 'next/link'
import { getContractById } from '../service'
import { GeneralContractInfoHeader } from './general-contract-info-header'
import { Alert, AlertDescription } from '@/components/ui/alert'
import { Button } from '@/components/ui/button'
import { AlertCircle, ArrowLeft } from 'lucide-react'
import { Skeleton } from '@/components/ui/skeleton'
import { ContractItemsTable } from './general-contract-items-table'
import { SubcontractChecklist } from './subcontract-checklist'
import { ContractBasicInfo } from './general-contract-basic-info'
import { CommunicationChannel } from './general-contract-communication-channel'
import { Location } from './general-contract-location'
import { FieldServiceRate } from './general-contract-field-service-rate'
import { OffsetDetails } from './general-contract-offset-details'

export default function ContractDetailPage() {
  const params = useParams()
  const contractId = params?.id ? parseInt(params.id as string) : null
  
  const [contract, setContract] = useState<Record<string, unknown> | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    const fetchContract = async () => {
      try {
        setLoading(true)
        setError(null)
        const contractData = await getContractById(contractId!)
        setContract(contractData)
      } catch (err) {
        console.error('Error fetching contract:', err)
        setError('계약 정보를 불러오는 중 오류가 발생했습니다.')
      } finally {
        setLoading(false)
      }
    }

    if (contractId && !isNaN(contractId)) {
      fetchContract()
    } else {
      setError('유효하지 않은 계약 ID입니다.')
      setLoading(false)
    }
  }, [contractId])

  if (loading) {
    return (
      <div className="container mx-auto py-6 space-y-6">
        <Skeleton className="h-8 w-64" />
        <div className="grid gap-6">
          <div className="grid grid-cols-2 gap-4">
            <Skeleton className="h-10 w-full" />
            <Skeleton className="h-10 w-full" />
          </div>
          <div className="grid grid-cols-3 gap-4">
            <Skeleton className="h-10 w-full" />
            <Skeleton className="h-10 w-full" />
            <Skeleton className="h-10 w-full" />
          </div>
          <Skeleton className="h-32 w-full" />
        </div>
      </div>
    )
  }

  if (error) {
    return (
      <div className="container mx-auto py-6">
        <Alert variant="destructive">
          <AlertCircle className="h-4 w-4" />
          <AlertDescription>
            {error}
          </AlertDescription>
        </Alert>
      </div>
    )
  }

  return (
    <div className="container mx-auto py-6 space-y-6">

      
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-3xl font-bold tracking-tight">계약 상세</h1>
          <p className="text-muted-foreground">
            계약번호: {contract?.contractNumber as string} (Rev.{contract?.revision as number})
          </p>
        </div>
        {/* 계약목록으로 돌아가기 버튼 */}
        <Button asChild variant="outline" size="sm">
          <Link href="/evcp/general-contracts">
            <ArrowLeft className="h-4 w-4 mr-2" />
            계약목록으로 돌아가기
          </Link>
        </Button>
      </div>
      {/* 계약 정보 헤더 */}
      {contract && <GeneralContractInfoHeader contract={contract} />}
      
      {/* 계약 상세 폼 */}
      {contract && (
        <div className="space-y-6">
          {/* ContractBasicInfo */}
          <ContractBasicInfo contractId={contract.id as number} />
          {/* 품목정보 */}
          {/* {!(contract?.contractScope === '단가' || contract?.contractScope === '물량(실적)') && (
            <div className="mb-4">
              <p className="text-sm text-gray-600 mb-2">
                <strong>품목정보 입력 안내:</strong>
                <br />
                단가/물량 확정 계약의 경우 수량 및 총 계약금액은 별도로 관리됩니다.
              </p>
            </div>
          )} */}
          <ContractItemsTable
            contractId={contract.id as number}
            items={[]}
            onItemsChange={() => {}}
            onTotalAmountChange={() => {}}
            currency="USD"
            availableBudget={0}
            readOnly={contract?.contractScope === '단가' || contract?.contractScope === '물량(실적)'}
          />
          {/* 하도급법 자율점검 체크리스트 */}
          <SubcontractChecklist
            contractId={contract.id as number}
            onDataChange={() => {}}
            readOnly={false}
            initialData={undefined}
          />
          {/* Communication Channel */}
          <CommunicationChannel contractId={Number(contract.id)} />

          {/* Location */}
          <Location contractId={Number(contract.id)} />

          {/* Field Service Rate */}
          <FieldServiceRate contractId={Number(contract.id)} />

          {/* Offset Details */}
          <OffsetDetails contractId={Number(contract.id)} />
        </div>
      )}
    </div>
  )
}