"use client"

import { useEffect, useTransition, useState, useRef } from "react"
import { useRouter, useParams } from "next/navigation"
import { z } from "zod"
import { useForm } from "react-hook-form"
import { zodResolver } from "@hookform/resolvers/zod"
import { CalendarIcon, ChevronRight, Search, X } from "lucide-react"
import { customAlphabet } from "nanoid"
import { parseAsStringEnum, useQueryState } from "nuqs"

import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Badge } from "@/components/ui/badge"
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import { cn } from "@/lib/utils"
import { useTranslation } from '@/i18n/client'
import { getFiltersStateParser } from "@/lib/parsers"
import { DateRangePicker } from "@/components/date-range-picker"

// nanoid 생성기
const generateId = customAlphabet("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 6)

// 필터 스키마 정의 (RFQ 관련 항목 유지)
const filterSchema = z.object({
  picCode: z.string().optional(),
  projectCode: z.string().optional(),
  rfqCode: z.string().optional(),
  itemCode: z.string().optional(),
  majorItemMaterialCode: z.string().optional(),
  status: z.string().optional(),
  dateRange: z.object({
    from: z.date().optional(),
    to: z.date().optional(),
  }).optional(),
})

// 상태 옵션 정의
const statusOptions = [
  { value: "RFQ Created", label: "RFQ Created" },
  { value: "RFQ Vendor Assignned", label: "RFQ Vendor Assignned" },
  { value: "RFQ Sent", label: "RFQ Sent" },
  { value: "Quotation Analysis", label: "Quotation Analysis" },
  { value: "PO Transfer", label: "PO Transfer" },
  { value: "PO Create", label: "PO Create" },
]

type FilterFormValues = z.infer<typeof filterSchema>

interface RFQFilterSheetProps {
  isOpen: boolean;
  onClose: () => void;
  onSearch?: () => void;
  isLoading?: boolean;
}

// Updated component for inline use (not a sheet anymore)
export function RFQFilterSheet({
  isOpen,
  onClose,
  onSearch,
  isLoading = false
}: RFQFilterSheetProps) {
  const router = useRouter()
  const params = useParams();
  const lng = params ? (params.lng as string) : 'ko';
  const { t } = useTranslation(lng);

  const [isPending, startTransition] = useTransition()

  // 초기화 상태 추가 - 폼 초기화 중에는 상태 변경을 방지
  const [isInitializing, setIsInitializing] = useState(false)
  // 마지막으로 적용된 필터를 추적하기 위한 ref
  const lastAppliedFilters = useRef<string>("")

  // nuqs로 URL 상태 관리 - 파라미터명을 'basicFilters'로 변경
  const [filters, setFilters] = useQueryState(
    "basicFilters",
    getFiltersStateParser().withDefault([])
  )

  // joinOperator 설정
  const [joinOperator, setJoinOperator] = useQueryState(
    "basicJoinOperator",
    parseAsStringEnum(["and", "or"]).withDefault("and")
  )

  // 현재 URL의 페이지 파라미터도 가져옴
  const [page, setPage] = useQueryState("page", { defaultValue: "1" })

  // 폼 상태 초기화
  const form = useForm<FilterFormValues>({
    resolver: zodResolver(filterSchema),
    defaultValues: {
      picCode: "",
      projectCode: "",
      rfqCode: "",
      itemCode: "",
      majorItemMaterialCode: "",
      status: "",
      dateRange: {
        from: undefined,
        to: undefined,
      },
    },
  })

  // URL 필터에서 초기 폼 상태 설정 - 개선된 버전
  useEffect(() => {
    // 현재 필터를 문자열로 직렬화
    const currentFiltersString = JSON.stringify(filters);

    // 패널이 열렸고, 필터가 있고, 마지막에 적용된 필터와 다를 때만 업데이트
    if (isOpen && filters && filters.length > 0 && currentFiltersString !== lastAppliedFilters.current) {
      setIsInitializing(true);

      const formValues = { ...form.getValues() };
      let formUpdated = false;

      filters.forEach(filter => {
        if (filter.id === "rfqSendDate" && Array.isArray(filter.value) && filter.value.length > 0) {
          formValues.dateRange = {
            from: filter.value[0] ? new Date(filter.value[0]) : undefined,
            to: filter.value[1] ? new Date(filter.value[1]) : undefined,
          };
          formUpdated = true;
        } else if (filter.id in formValues) {
          // @ts-ignore - 동적 필드 접근
          formValues[filter.id] = filter.value;
          formUpdated = true;
        }
      });

      // 폼 값이 변경된 경우에만 reset으로 한 번에 업데이트
      if (formUpdated) {
        form.reset(formValues);
        lastAppliedFilters.current = currentFiltersString;
      }

      setIsInitializing(false);
    }
  }, [filters, isOpen]) // form 의존성 제거

  // 현재 적용된 필터 카운트
  const getActiveFilterCount = () => {
    return filters?.length || 0
  }

  // 폼 제출 핸들러 - PQ 방식으로 수정 (수동 URL 업데이트 버전)
  async function onSubmit(data: FilterFormValues) {
    // 초기화 중이면 제출 방지
    if (isInitializing) return;

    startTransition(async () => {
      try {
        // 필터 배열 생성
        const newFilters = []

        if (data.picCode?.trim()) {
          newFilters.push({
            id: "picCode",
            value: data.picCode.trim(),
            type: "text",
            operator: "iLike",
            rowId: generateId()
          })
        }

        if (data.projectCode?.trim()) {
          newFilters.push({
            id: "projectCode",
            value: data.projectCode.trim(),
            type: "text",
            operator: "iLike",
            rowId: generateId()
          })
        }

        if (data.rfqCode?.trim()) {
          newFilters.push({
            id: "rfqCode",
            value: data.rfqCode.trim(),
            type: "text",
            operator: "iLike",
            rowId: generateId()
          })
        }

        if (data.itemCode?.trim()) {
          newFilters.push({
            id: "itemCode",
            value: data.itemCode.trim(),
            type: "text",
            operator: "iLike",
            rowId: generateId()
          })
        }

        if (data.majorItemMaterialCode?.trim()) {
          newFilters.push({
            id: "majorItemMaterialCode",
            value: data.majorItemMaterialCode.trim(),
            type: "text",
            operator: "iLike",
            rowId: generateId()
          })
        }

        if (data.status?.trim()) {
          newFilters.push({
            id: "status",
            value: data.status.trim(),
            type: "select",
            operator: "eq",
            rowId: generateId()
          })
        }

        // Add date range to params if it exists
        if (data.dateRange?.from) {
          newFilters.push({
            id: "rfqSendDate",
            value: [
              data.dateRange.from.toISOString().split('T')[0],
              data.dateRange.to ? data.dateRange.to.toISOString().split('T')[0] : undefined
            ].filter(Boolean),
            type: "date",
            operator: "isBetween",
            rowId: generateId()
          })
        }

        console.log("=== RFQ Filter Submit Debug ===");
        console.log("Generated filters:", newFilters);
        console.log("Join operator:", joinOperator);

        // 🔑 PQ 방식: 수동으로 URL 업데이트 (nuqs 대신)
        const currentUrl = new URL(window.location.href);
        const params = new URLSearchParams(currentUrl.search);
        
        // 기존 필터 관련 파라미터 제거
        params.delete('basicFilters');
        params.delete('basicJoinOperator');
        params.delete('page');
        
        // 새로운 필터 추가
        if (newFilters.length > 0) {
          params.set('basicFilters', JSON.stringify(newFilters));
          params.set('basicJoinOperator', joinOperator);
        }
        
        // 페이지를 1로 설정
        params.set('page', '1');
        
        const newUrl = `${currentUrl.pathname}?${params.toString()}`;
        console.log("New URL:", newUrl);
        
        // 🔑 PQ 방식: 페이지 완전 새로고침으로 서버 렌더링 강제
        window.location.href = newUrl;

        // 마지막 적용된 필터 업데이트
        lastAppliedFilters.current = JSON.stringify(newFilters);

        // 필터 업데이트 후 조회 핸들러 호출 (제공된 경우)
        if (onSearch) {
          console.log("Calling onSearch...");
          onSearch();
        }

        console.log("=== RFQ Filter Submit Complete ===");
      } catch (error) {
        console.error("RFQ 필터 적용 오류:", error);
      }
    })
  }

  // 필터 초기화 핸들러 - PQ 방식으로 수정
  async function handleReset() {
    try {
      setIsInitializing(true);

      form.reset({
        picCode: "",
        projectCode: "",
        rfqCode: "",
        itemCode: "",
        majorItemMaterialCode: "",
        status: "",
        dateRange: { from: undefined, to: undefined },
      });

      console.log("=== RFQ Filter Reset Debug ===");
      console.log("Current URL before reset:", window.location.href);

      // 🔑 PQ 방식: 수동으로 URL 초기화
      const currentUrl = new URL(window.location.href);
      const params = new URLSearchParams(currentUrl.search);

      // 필터 관련 파라미터 제거
      params.delete('basicFilters');
      params.delete('basicJoinOperator');
      params.set('page', '1');

      const newUrl = `${currentUrl.pathname}?${params.toString()}`;
      console.log("Reset URL:", newUrl);

      // 🔑 PQ 방식: 페이지 완전 새로고침
      window.location.href = newUrl;

      // 마지막 적용된 필터 초기화
      lastAppliedFilters.current = "";

      console.log("RFQ 필터 초기화 완료");
      setIsInitializing(false);
    } catch (error) {
      console.error("RFQ 필터 초기화 오류:", error);
      setIsInitializing(false);
    }
  }

  // Don't render if not open (for side panel use)
  if (!isOpen) {
    return null;
  }

  return (
    <div className="flex flex-col h-full max-h-full bg-[#F5F7FB] px-6 sm:px-8"  style={{backgroundColor:"#F5F7FB", paddingLeft:"2rem", paddingRight:"2rem"}}>
      {/* Filter Panel Header */}
      <div className="flex items-center justify-between px-6 min-h-[60px] shrink-0">
        <h3 className="text-lg font-semibold whitespace-nowrap">검색 필터</h3>
        <div className="flex items-center gap-2">
          {getActiveFilterCount() > 0 && (
            <Badge variant="secondary" className="px-2 py-1">
              {getActiveFilterCount()}개 필터 적용됨
            </Badge>
          )}
        </div>
      </div>

      {/* Join Operator Selection */}
      <div className="px-6 shrink-0">
        <label className="text-sm font-medium">조건 결합 방식</label>
        <Select
          value={joinOperator}
          onValueChange={(value: "and" | "or") => setJoinOperator(value)}
          disabled={isInitializing}
        >
          <SelectTrigger className="h-8 w-[180px] mt-2 bg-white">
            <SelectValue placeholder="조건 결합 방식" />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="and">모든 조건 충족 (AND)</SelectItem>
            <SelectItem value="or">하나라도 충족 (OR)</SelectItem>
          </SelectContent>
        </Select>
      </div>

      <Form {...form}>
        <form onSubmit={form.handleSubmit(onSubmit)} className="flex flex-col h-full min-h-0">
          {/* Scrollable content area - 헤더와 버튼 사이에서 스크롤 */}
          <div className="flex-1 min-h-0 overflow-y-auto px-6 pb-4">
            <div className="space-y-4 pt-2">
              {/* 발주 담당 */}
              <FormField
                control={form.control}
                name="picCode"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t("발주담당")}</FormLabel>
                    <FormControl>
                      <div className="relative">
                        <Input
                          placeholder={t("발주담당 입력")}
                          {...field}
                          className={cn(field.value && "pr-8", "bg-white")}
                          disabled={isInitializing}
                        />
                        {field.value && (
                          <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="absolute right-0 top-0 h-full px-2"
                            onClick={(e) => {
                              e.stopPropagation();
                              form.setValue("picCode", "");
                            }}
                            disabled={isInitializing}
                          >
                            <X className="size-3.5" />
                            <span className="sr-only">Clear</span>
                          </Button>
                        )}
                      </div>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* 프로젝트 코드 */}
              <FormField
                control={form.control}
                name="projectCode"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t("프로젝트 코드")}</FormLabel>
                    <FormControl>
                      <div className="relative">
                        <Input
                          placeholder={t("프로젝트 코드 입력")}
                          {...field}
                          className={cn(field.value && "pr-8", "bg-white")}
                          disabled={isInitializing}
                        />
                        {field.value && (
                          <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="absolute right-0 top-0 h-full px-2"
                            onClick={(e) => {
                              e.stopPropagation();
                              form.setValue("projectCode", "");
                            }}
                            disabled={isInitializing}
                          >
                            <X className="size-3.5" />
                            <span className="sr-only">Clear</span>
                          </Button>
                        )}
                      </div>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* RFQ NO. */}
              <FormField
                control={form.control}
                name="rfqCode"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t("RFQ NO.")}</FormLabel>
                    <FormControl>
                      <div className="relative">
                        <Input
                          placeholder={t("RFQ 번호 입력")}
                          {...field}
                          className={cn(field.value && "pr-8", "bg-white")}
                          disabled={isInitializing}
                        />
                        {field.value && (
                          <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="absolute right-0 top-0 h-full px-2"
                            onClick={(e) => {
                              e.stopPropagation();
                              form.setValue("rfqCode", "");
                            }}
                            disabled={isInitializing}
                          >
                            <X className="size-3.5" />
                            <span className="sr-only">Clear</span>
                          </Button>
                        )}
                      </div>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* 자재그룹 */}
              <FormField
                control={form.control}
                name="itemCode"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t("자재그룹")}</FormLabel>
                    <FormControl>
                      <div className="relative">
                        <Input
                          placeholder={t("자재그룹 입력")}
                          {...field}
                          className={cn(field.value && "pr-8", "bg-white")}
                          disabled={isInitializing}
                        />
                        {field.value && (
                          <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="absolute right-0 top-0 h-full px-2"
                            onClick={(e) => {
                              e.stopPropagation();
                              form.setValue("itemCode", "");
                            }}
                            disabled={isInitializing}
                          >
                            <X className="size-3.5" />
                            <span className="sr-only">Clear</span>
                          </Button>
                        )}
                      </div>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* 자재코드 */}
              <FormField
                control={form.control}
                name="majorItemMaterialCode"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t("자재코드")}</FormLabel>
                    <FormControl>
                      <div className="relative">
                        <Input
                          placeholder={t("자재코드 입력")}
                          {...field}
                          className={cn(field.value && "pr-8", "bg-white")}
                          disabled={isInitializing}
                        />
                        {field.value && (
                          <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="absolute right-0 top-0 h-full px-2"
                            onClick={(e) => {
                              e.stopPropagation();
                              form.setValue("majorItemMaterialCode", "");
                            }}
                            disabled={isInitializing}
                          >
                            <X className="size-3.5" />
                            <span className="sr-only">Clear</span>
                          </Button>
                        )}
                      </div>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* Status */}
              <FormField
                control={form.control}
                name="status"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t("Status")}</FormLabel>
                    <Select
                      value={field.value}
                      onValueChange={field.onChange}
                      disabled={isInitializing}
                    >
                      <FormControl>
                        <SelectTrigger className={cn(field.value && "pr-8", "bg-white")}>
                          <div className="flex justify-between w-full">
                            <SelectValue placeholder={t("Select status")} />
                            {field.value && (
                              <Button
                                type="button"
                                variant="ghost"
                                size="icon"
                                className="h-4 w-4 -mr-2"
                                onClick={(e) => {
                                  e.stopPropagation();
                                  form.setValue("status", "");
                                }}
                                disabled={isInitializing}
                              >
                                <X className="size-3" />
                                <span className="sr-only">Clear</span>
                              </Button>
                            )}
                          </div>
                        </SelectTrigger>
                      </FormControl>
                      <SelectContent>
                        {statusOptions.map(option => (
                          <SelectItem key={option.value} value={option.value}>
                            {option.label}
                          </SelectItem>
                        ))}
                      </SelectContent>
                    </Select>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* RFQ 전송일 */}
              <FormField
                control={form.control}
                name="dateRange"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t("RFQ 전송일")}</FormLabel>
                    <FormControl>
                      <div className="relative">
                        <DateRangePicker
                          triggerSize="default"
                          triggerClassName="w-full bg-white"
                          align="start"
                          showClearButton={true}
                          placeholder={t("RFQ 전송일 범위를 고르세요")}
                          value={field.value || undefined}
                          onChange={field.onChange}
                          disabled={isInitializing}
                        />
                        {(field.value?.from || field.value?.to) && (
                          <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="absolute right-10 top-0 h-full px-2"
                            onClick={(e) => {
                              e.stopPropagation();
                              form.setValue("dateRange", { from: undefined, to: undefined });
                            }}
                            disabled={isInitializing}
                          >
                            <X className="size-3.5" />
                            <span className="sr-only">Clear</span>
                          </Button>
                        )}
                      </div>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
            </div>
          </div>

          {/* Fixed buttons at bottom */}
          <div className="p-4 shrink-0">
            <div className="flex gap-2 justify-end">
              <Button
                type="button"
                variant="outline"
                onClick={handleReset}
                disabled={isPending || getActiveFilterCount() === 0 || isInitializing}
                className="px-4"
              >
                {t("초기화")}
              </Button>
              <Button
                type="submit"
                variant="samsung"
                disabled={isPending || isLoading || isInitializing}
                className="px-4"
              >
                <Search className="size-4 mr-2" />
                {isPending || isLoading ? t("조회 중...") : t("조회")}
              </Button>
            </div>
          </div>
        </form>
      </Form>
    </div>
  )
}