"use client"

import * as React from "react"
import { useForm } from "react-hook-form"
import { zodResolver } from "@hookform/resolvers/zod"
import { Button } from "@/components/ui/button"
import {
  Sheet,
  SheetContent,
  SheetDescription,
  SheetHeader,
  SheetTitle,
} from "@/components/ui/sheet"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Textarea } from "@/components/ui/textarea"
import { Separator } from "@/components/ui/separator"
import { toast } from "sonner"
import { Loader2, Edit } from "lucide-react"
import { updateApprovalLine, type ApprovalLine } from "../service"
import { type ApprovalLineFormData, ApprovalLineSchema } from "../validations"
import { OrganizationManagerSelector, type OrganizationManagerItem } from "@/components/common/organization/organization-manager-selector"
import { useSession } from "next-auth/react"
import { ApprovalLineSelector } from "@/components/knox/approval/ApprovalLineSelector"

interface UpdateApprovalLineSheetProps {
  open: boolean
  onOpenChange: (open: boolean) => void
  line: ApprovalLine | null
}

// 최소 형태의 Apln 아이템 타입 (line.aplns JSON 구조 대응)
interface MinimalAplnItem {
  id: string
  epId?: string
  userId?: string
  emailAddress?: string
  name?: string
  deptName?: string
  role: "0" | "1" | "2" | "3" | "4" | "7" | "9"
  seq: string
  opinion?: string
  [key: string]: unknown
}

export function UpdateApprovalLineSheet({ open, onOpenChange, line }: UpdateApprovalLineSheetProps) {
  const { data: session } = useSession();
  const [isSubmitting, setIsSubmitting] = React.useState(false);

  // 고유 ID 생성 함수 (조직 관리자 추가 시 사용)
  const generateUniqueId = () => `apln-${Date.now()}-${Math.random().toString(36).slice(2, 11)}`;

  const form = useForm<ApprovalLineFormData>({
    resolver: zodResolver(ApprovalLineSchema),
    defaultValues: {
      name: "",
      category: "",
      description: "",
      aplns: [],
    },
  });

  // line이 변경될 때 폼 초기화
  React.useEffect(() => {
    if (line) {
      const existingAplns = (line.aplns as unknown as MinimalAplnItem[]) || [];
      
      // 기안자가 없으면 추가
      const hasDraft = existingAplns.some((a) => String(a.seq) === "0");
      let nextAplns: MinimalAplnItem[] = existingAplns;
      
      if (!hasDraft) {
        nextAplns = [
          {
            id: generateUniqueId(),
            epId: undefined,
            userId: undefined,
            emailAddress: undefined,
            name: "기안자",
            deptName: undefined,
            role: "0",
            seq: "0",
            opinion: "",
          },
          ...existingAplns,
        ];
      }
      
      form.reset({
        name: line.name,
        category: line.category || "",
        description: line.description || "",
        aplns: nextAplns as ApprovalLineFormData["aplns"],
      });
    }
  }, [line, form]);

  const aplns = form.watch("aplns");

  // 조직 관리자 추가 (공용 선택기 외 보조 입력 경로)
  const addOrganizationManagers = (managers: OrganizationManagerItem[]) => {
    const next = [...aplns];
    const uniqueSeqs = Array.from(new Set(next.map((a) => parseInt(a.seq))));
    const maxSeq = uniqueSeqs.length ? Math.max(...uniqueSeqs) : 0;

    managers.forEach((manager, idx) => {
      const exists = next.findIndex((a) => a.epId === manager.managerId);
      if (exists === -1) {
        const newSeqNum = Math.max(1, maxSeq + 1 + idx);
        const newSeq = newSeqNum.toString();
        next.push({
          id: generateUniqueId(),
          epId: manager.managerId,
          userId: undefined,
          emailAddress: undefined,
          name: manager.managerName,
          deptName: manager.departmentName,
          role: "1",
          seq: newSeq,
          opinion: "",
        });
      }
    });

    form.setValue("aplns", next, { shouldDirty: true });
  };

  const onSubmit = async (data: ApprovalLineFormData) => {
    if (!line || !session?.user?.id) {
      toast.error("수정할 결재선이 없거나 로그인이 필요합니다.");
      return;
    }

    setIsSubmitting(true);
    try {
      await updateApprovalLine(line.id, {
        name: data.name,
        category: data.category || null,
        description: data.description,
        aplns: data.aplns,
        updatedBy: Number(session.user.id),
      });

      toast.success("결재선이 성공적으로 수정되었습니다.");
      onOpenChange(false);
    } catch {
      toast.error("결재선 수정 중 오류가 발생했습니다.");
    } finally {
      setIsSubmitting(false);
    }
  };

  if (!line) return null;

  return (
    <Sheet open={open} onOpenChange={onOpenChange}>
      <SheetContent className="w-full sm:max-w-4xl overflow-y-auto">
        <SheetHeader>
          <SheetTitle className="flex items-center gap-2">
            <Edit className="h-5 w-5" />
            결재선 수정
          </SheetTitle>
          <SheetDescription>
            &quot;{line.name}&quot; 결재선을 수정합니다. 결재자를 추가하고 순서를 조정할 수 있습니다.
          </SheetDescription>
        </SheetHeader>

        <div className="mt-6">
          <Form {...form}>
            <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-6">
              {/* 기본 정보 */}
              <div className="space-y-4">
                <FormField
                  control={form.control}
                  name="name"
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>결재선 이름 *</FormLabel>
                      <FormControl>
                        <Input placeholder="결재선 이름을 입력하세요" {...field} />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <FormField
                  control={form.control}
                  name="category"
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>카테고리</FormLabel>
                      <FormControl>
                        <Input placeholder="카테고리를 입력하세요" {...field} />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <FormField
                  control={form.control}
                  name="description"
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>설명</FormLabel>
                      <FormControl>
                        <Textarea placeholder="결재선에 대한 설명을 입력하세요" {...field} />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />
              </div>

              <Separator />

              {/* 결재 경로 */}
              <div className="space-y-4">
                <h3 className="text-lg font-semibold">결재 경로</h3>

                <ApprovalLineSelector
                  value={aplns}
                  onChange={(next) => form.setValue("aplns", next, { shouldDirty: true })}
                      placeholder="결재자를 검색하세요..."
                      domainFilter={{ type: "exclude", domains: ["partners"] }}
                      maxSelections={10}
                    />

                {/* 조직 관리자 추가 (선택 사항) */}
                  {/* <div className="p-4 border border-dashed border-gray-300 rounded-lg">
                    <div className="mb-2">
                      <label className="text-sm font-medium text-gray-700">조직 관리자로 추가</label>
                      <p className="text-xs text-gray-500">조직별 책임자를 검색하여 추가하세요</p>
                    </div>
                    <OrganizationManagerSelector
                      selectedManagers={[]}
                      onManagersChange={addOrganizationManagers}
                      placeholder="조직 관리자를 검색하세요..."
                      maxSelections={10}
                    />
                  </div> */}
              </div>

              <Separator />

              {/* 제출 버튼 */}
              <div className="flex justify-end space-x-3">
                <Button
                  type="button"
                  variant="outline"
                  onClick={() => onOpenChange(false)}
                  disabled={isSubmitting}
                >
                  취소
                </Button>
                <Button type="submit" disabled={isSubmitting}>
                  {isSubmitting ? (
                    <>
                      <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                      수정 중...
                    </>
                  ) : (
                    "결재선 수정"
                  )}
                </Button>
              </div>
            </form>
          </Form>
        </div>
      </SheetContent>
    </Sheet>
  )
}