"use client"

import * as React from "react"
import { useState, useEffect } from "react"
import { useForm } from "react-hook-form"
import { zodResolver } from "@hookform/resolvers/zod"
import * as z from "zod"
import { toast } from "sonner"
import { useRouter } from "next/navigation"
import { CalendarIcon, Save, Send, ArrowLeft } from "lucide-react"

import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Textarea } from "@/components/ui/textarea"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { Badge } from "@/components/ui/badge"
import { Separator } from "@/components/ui/separator"
import { DatePicker } from "@/components/ui/date-picker"
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
import { Skeleton } from "@/components/ui/skeleton"

import { formatCurrency, formatDate } from "@/lib/utils"
import {
  updateTechSalesVendorQuotation,
  submitTechSalesVendorQuotation,
  fetchCurrencies
} from "../service"

// 견적서 폼 스키마 (techsales용 단순화)
const quotationFormSchema = z.object({
  currency: z.string().min(1, "통화를 선택해주세요"),
  totalPrice: z.string().min(1, "총액을 입력해주세요"),
  validUntil: z.date({
    required_error: "견적 유효기간을 선택해주세요",
    invalid_type_error: "유효한 날짜를 선택해주세요",
  }),
  remark: z.string().optional(),
})

type QuotationFormValues = z.infer<typeof quotationFormSchema>

// 통화 타입
interface Currency {
  code: string
  name: string
}

// 이 컴포넌트에 전달되는 견적서 데이터 타입 (techsales용 단순화)
interface TechSalesVendorQuotation {
  id: number
  rfqId: number
  vendorId: number
  quotationCode: string | null
  quotationVersion: number | null
  totalPrice: string | null
  currency: string | null
  validUntil: Date | null
  status: "Draft" | "Submitted" | "Revised" | "Rejected" | "Accepted"
  remark: string | null
  rejectionReason: string | null
  submittedAt: Date | null
  acceptedAt: Date | null
  createdAt: Date
  updatedAt: Date
  rfq: {
    id: number
    rfqCode: string | null
    dueDate: Date | null
    status: string | null
    materialCode: string | null
    remark: string | null
    projectSnapshot?: {
      pspid?: string
      projNm?: string
      sector?: string
      projMsrm?: number
      kunnr?: string
      kunnrNm?: string
      ptypeNm?: string
    } | null
    seriesSnapshot?: Array<{
      pspid: string
      sersNo: string
      scDt?: string
      klDt?: string
      lcDt?: string
      dlDt?: string
      dockNo?: string
      dockNm?: string
      projNo?: string
      post1?: string
    }> | null
    item?: {
      id: number
      itemCode: string | null
      itemName: string | null
    } | null
    biddingProject?: {
      id: number
      pspid: string | null
      projNm: string | null
    } | null
    createdByUser?: {
      id: number
      name: string | null
      email: string | null
    } | null
  }
  vendor: {
    id: number
    vendorName: string
    vendorCode: string | null
  }
}

interface TechSalesQuotationEditorProps {
  quotation: TechSalesVendorQuotation
}

export default function TechSalesQuotationEditor({ quotation }: TechSalesQuotationEditorProps) {
  const router = useRouter()
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [isSaving, setIsSaving] = useState(false)
  const [currencies, setCurrencies] = useState<Currency[]>([])
  const [loadingCurrencies, setLoadingCurrencies] = useState(true)

  // 폼 초기화
  const form = useForm<QuotationFormValues>({
    resolver: zodResolver(quotationFormSchema),
    defaultValues: {
      currency: quotation.currency || "USD",
      totalPrice: quotation.totalPrice || "",
      validUntil: quotation.validUntil || undefined,
      remark: quotation.remark || "",
    },
  })

  // 통화 목록 로드
  useEffect(() => {
    const loadCurrencies = async () => {
      try {
        const { data, error } = await fetchCurrencies()
        if (error) {
          toast.error("통화 목록을 불러오는데 실패했습니다")
          return
        }
        setCurrencies(data || [])
      } catch (error) {
        console.error("Error loading currencies:", error)
        toast.error("통화 목록을 불러오는데 실패했습니다")
      } finally {
        setLoadingCurrencies(false)
      }
    }

    loadCurrencies()
  }, [])

  // 마감일 확인
  const isBeforeDueDate = () => {
    if (!quotation.rfq.dueDate) return true
    return new Date() <= new Date(quotation.rfq.dueDate)
  }

  // 편집 가능 여부 확인
  const isEditable = () => {
    return quotation.status === "Draft" || quotation.status === "Rejected"
  }

  // 제출 가능 여부 확인
  const isSubmitReady = () => {
    const values = form.getValues()
    return values.currency && 
           values.totalPrice && 
           parseFloat(values.totalPrice) > 0 && 
           values.validUntil &&
           isBeforeDueDate()
  }

  // 저장 핸들러
  const handleSave = async () => {
    if (!isEditable()) {
      toast.error("편집할 수 없는 상태입니다")
      return
    }

    setIsSaving(true)
    try {
      const values = form.getValues()
      const { data, error } = await updateTechSalesVendorQuotation({
        id: quotation.id,
        currency: values.currency,
        totalPrice: values.totalPrice,
        validUntil: values.validUntil,
        remark: values.remark,
        updatedBy: quotation.vendorId, // 임시로 vendorId 사용
      })

      if (error) {
        toast.error(error)
        return
      }

      toast.success("견적서가 저장되었습니다")
      router.refresh()
    } catch (error) {
      console.error("Error saving quotation:", error)
      toast.error("견적서 저장 중 오류가 발생했습니다")
    } finally {
      setIsSaving(false)
    }
  }

  // 제출 핸들러
  const handleSubmit = async () => {
    if (!isEditable()) {
      toast.error("제출할 수 없는 상태입니다")
      return
    }

    if (!isSubmitReady()) {
      toast.error("필수 항목을 모두 입력해주세요")
      return
      }

    if (!isBeforeDueDate()) {
      toast.error("마감일이 지났습니다")
      return
    }

    setIsSubmitting(true)
    try {
      const values = form.getValues()
      const { data, error } = await submitTechSalesVendorQuotation({
        id: quotation.id,
        currency: values.currency,
        totalPrice: values.totalPrice,
        validUntil: values.validUntil,
        remark: values.remark,
        updatedBy: quotation.vendorId, // 임시로 vendorId 사용
      })

      if (error) {
        toast.error(error)
        return
      }

      toast.success("견적서가 제출되었습니다")
      router.push("/ko/partners/techsales/rfq-ship")
    } catch (error) {
      console.error("Error submitting quotation:", error)
      toast.error("견적서 제출 중 오류가 발생했습니다")
    } finally {
      setIsSubmitting(false)
    }
  }

  // 상태 배지
  const getStatusBadge = (status: string) => {
    const statusConfig = {
      "Draft": { label: "초안", variant: "secondary" as const },
      "Submitted": { label: "제출됨", variant: "default" as const },
      "Revised": { label: "수정됨", variant: "outline" as const },
      "Rejected": { label: "반려됨", variant: "destructive" as const },
      "Accepted": { label: "승인됨", variant: "success" as const },
    }
    
    const config = statusConfig[status as keyof typeof statusConfig] || {
      label: status,
      variant: "secondary" as const
    }
    
    return <Badge variant={config.variant}>{config.label}</Badge>
  }

  return (
    <div className="container max-w-4xl mx-auto py-6 space-y-6">
      {/* 헤더 */}
      <div className="flex items-center justify-between">
        <div className="flex items-center space-x-4">
          <Button
            variant="ghost"
            size="sm"
            onClick={() => router.back()}
          >
            <ArrowLeft className="h-4 w-4 mr-2" />
            뒤로가기
          </Button>
        <div>
            <h1 className="text-2xl font-bold">기술영업 견적서</h1>
          <p className="text-muted-foreground">
              RFQ: {quotation.rfq.rfqCode} | {getStatusBadge(quotation.status)}
            </p>
          </div>
        </div>
        <div className="flex items-center space-x-2">
          {isEditable() && (
            <>
              <Button
                variant="outline"
                onClick={handleSave}
                disabled={isSaving}
              >
                <Save className="h-4 w-4 mr-2" />
                {isSaving ? "저장 중..." : "저장"}
              </Button>
              <Button
                onClick={handleSubmit}
                disabled={isSubmitting || !isSubmitReady()}
              >
                <Send className="h-4 w-4 mr-2" />
                {isSubmitting ? "제출 중..." : "제출"}
              </Button>
            </>
          )}
        </div>
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
        {/* 왼쪽: RFQ 정보 */}
        <div className="lg:col-span-1 space-y-6">
          {/* RFQ 기본 정보 */}
          <Card>
            <CardHeader>
              <CardTitle>RFQ 정보</CardTitle>
            </CardHeader>
            <CardContent className="space-y-4">
              <div>
                <label className="text-sm font-medium text-muted-foreground">RFQ 번호</label>
                <p className="font-mono">{quotation.rfq.rfqCode}</p>
              </div>
              <div>
                <label className="text-sm font-medium text-muted-foreground">자재 코드</label>
                <p>{quotation.rfq.materialCode || "N/A"}</p>
              </div>
              <div>
                <label className="text-sm font-medium text-muted-foreground">품목명</label>
                <p>{quotation.rfq.item?.itemName || "N/A"}</p>
              </div>
              <div>
                <label className="text-sm font-medium text-muted-foreground">마감일</label>
                <p className={!isBeforeDueDate() ? "text-red-600 font-medium" : ""}>
                  {quotation.rfq.dueDate ? formatDate(quotation.rfq.dueDate) : "N/A"}
                </p>
              </div>
              {quotation.rfq.remark && (
                <div>
                  <label className="text-sm font-medium text-muted-foreground">비고</label>
                  <p className="text-sm">{quotation.rfq.remark}</p>
                </div>
              )}
            </CardContent>
          </Card>

          {/* 프로젝트 정보 */}
          {quotation.rfq.projectSnapshot && (
            <Card>
              <CardHeader>
                <CardTitle>프로젝트 정보</CardTitle>
              </CardHeader>
              <CardContent className="space-y-3">
                <div>
                  <label className="text-sm font-medium text-muted-foreground">프로젝트 번호</label>
                  <p className="font-mono">{quotation.rfq.projectSnapshot.pspid}</p>
                </div>
                <div>
                  <label className="text-sm font-medium text-muted-foreground">프로젝트명</label>
                  <p>{quotation.rfq.projectSnapshot.projNm || "N/A"}</p>
                </div>
                <div>
                  <label className="text-sm font-medium text-muted-foreground">선종</label>
                  <p>{quotation.rfq.projectSnapshot.ptypeNm || "N/A"}</p>
                </div>
                <div>
                  <label className="text-sm font-medium text-muted-foreground">척수</label>
                  <p>{quotation.rfq.projectSnapshot.projMsrm || "N/A"}</p>
                </div>
                <div>
                  <label className="text-sm font-medium text-muted-foreground">선주</label>
                  <p>{quotation.rfq.projectSnapshot.kunnrNm || "N/A"}</p>
                </div>
              </CardContent>
            </Card>
          )}

          {/* 시리즈 정보 */}
          {quotation.rfq.seriesSnapshot && quotation.rfq.seriesSnapshot.length > 0 && (
            <Card>
              <CardHeader>
                <CardTitle>시리즈 일정</CardTitle>
              </CardHeader>
              <CardContent>
                <div className="space-y-3">
                  {quotation.rfq.seriesSnapshot.map((series, index) => (
                    <div key={index} className="border rounded p-3">
                      <div className="font-medium mb-2">시리즈 {series.sersNo}</div>
                      <div className="grid grid-cols-2 gap-2 text-sm">
                        {series.klDt && (
                          <div>
                            <span className="text-muted-foreground">K/L:</span> {formatDate(series.klDt)}
                          </div>
                        )}
                        {series.dlDt && (
                          <div>
                            <span className="text-muted-foreground">인도:</span> {formatDate(series.dlDt)}
                          </div>
                        )}
                </div>
              </div>
                  ))}
              </div>
              </CardContent>
          </Card>
          )}
        </div>

        {/* 오른쪽: 견적서 입력 폼 */}
        <div className="lg:col-span-2">
              <Card>
                <CardHeader>
              <CardTitle>견적서 작성</CardTitle>
                  <CardDescription>
                총액 기반으로 견적을 작성해주세요.
                  </CardDescription>
                </CardHeader>
            <CardContent>
              <Form {...form}>
                <form className="space-y-6">
                  {/* 통화 선택 */}
                    <FormField
                      control={form.control}
                      name="currency"
                      render={({ field }) => (
                        <FormItem>
                        <FormLabel>통화 *</FormLabel>
                          <Select
                            onValueChange={field.onChange}
                          defaultValue={field.value}
                          disabled={!isEditable()}
                          >
                            <FormControl>
                              <SelectTrigger>
                              <SelectValue placeholder="통화를 선택하세요" />
                              </SelectTrigger>
                            </FormControl>
                            <SelectContent>
                            {loadingCurrencies ? (
                              <div className="p-2">
                                <Skeleton className="h-4 w-full" />
                              </div>
                            ) : (
                              currencies.map((currency) => (
                                <SelectItem key={currency.code} value={currency.code}>
                                  {currency.code} - {currency.name}
                                </SelectItem>
                              ))
                            )}
                            </SelectContent>
                          </Select>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                  {/* 총액 입력 */}
                  <FormField
                    control={form.control}
                    name="totalPrice"
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>총액 *</FormLabel>
                        <FormControl>
                          <Input
                            type="number"
                            step="0.01"
                            placeholder="총액을 입력하세요"
                            disabled={!isEditable()}
                            {...field}
                          />
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />

                  {/* 유효기간 */}
                  <FormField
                    control={form.control}
                    name="validUntil"
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>견적 유효기간 *</FormLabel>
                        <FormControl>
                          <DatePicker
                            date={field.value}
                            onDateChange={field.onChange}
                            disabled={!isEditable()}
                            placeholder="유효기간을 선택하세요"
                          />
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />

                  {/* 비고 */}
                  <FormField
                    control={form.control}
                    name="remark"
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>비고</FormLabel>
                        <FormControl>
                          <Textarea
                            placeholder="추가 설명이나 특이사항을 입력하세요"
                            disabled={!isEditable()}
                            rows={4}
                            {...field}
                          />
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />

                  {/* 반려 사유 (반려된 경우에만 표시) */}
                  {quotation.status === "Rejected" && quotation.rejectionReason && (
                    <div className="p-4 bg-red-50 border border-red-200 rounded-lg">
                      <label className="text-sm font-medium text-red-800">반려 사유</label>
                      <p className="text-sm text-red-700 mt-1">{quotation.rejectionReason}</p>
                    </div>
                  )}

                  {/* 제출 정보 */}
                  {quotation.submittedAt && (
                    <div className="p-4 bg-blue-50 border border-blue-200 rounded-lg">
                      <label className="text-sm font-medium text-blue-800">제출 정보</label>
                      <p className="text-sm text-blue-700 mt-1">
                        제출일: {formatDate(quotation.submittedAt)}
                      </p>
                            </div>
                          )}
                </form>
              </Form>
            </CardContent>
          </Card>
        </div>
      </div>
    </div>
  )
}