"use client";

import { useState, useEffect } from "react";
import { Plus, X, Star } from "lucide-react";
import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Badge } from "@/components/ui/badge";
import type { Department, DepartmentMember } from "@/types/department";
import * as departmentAPI from "@/lib/api/department";

interface DepartmentMembersProps {
  companyCode: string;
  selectedDepartment: Department | null;
}

/**
 * 부서 인원 관리 컴포넌트
 */
export function DepartmentMembers({ companyCode, selectedDepartment }: DepartmentMembersProps) {
  const [members, setMembers] = useState<DepartmentMember[]>([]);
  const [isLoading, setIsLoading] = useState(false);
  const [isAddModalOpen, setIsAddModalOpen] = useState(false);
  const [searchUserId, setSearchUserId] = useState("");

  // 부서원 목록 로드
  useEffect(() => {
    if (selectedDepartment) {
      loadMembers();
    }
  }, [selectedDepartment]);

  const loadMembers = async () => {
    if (!selectedDepartment) return;

    setIsLoading(true);
    try {
      const response = await departmentAPI.getDepartmentMembers(selectedDepartment.dept_code);
      if (response.success && response.data) {
        setMembers(response.data);
      } else {
        console.error("부서원 목록 로드 실패:", response.error);
        setMembers([]);
      }
    } catch (error) {
      console.error("부서원 목록 로드 실패:", error);
      setMembers([]);
    } finally {
      setIsLoading(false);
    }
  };

  // 부서원 추가
  const handleAddMember = async () => {
    if (!searchUserId.trim() || !selectedDepartment) return;

    try {
      const response = await departmentAPI.addDepartmentMember(
        selectedDepartment.dept_code,
        searchUserId
      );

      if (response.success) {
        setIsAddModalOpen(false);
        setSearchUserId("");
        loadMembers();
      } else {
        alert(response.error || "부서원 추가에 실패했습니다.");
      }
    } catch (error) {
      console.error("부서원 추가 실패:", error);
      alert("부서원 추가 중 오류가 발생했습니다.");
    }
  };

  // 부서원 제거
  const handleRemoveMember = async (userId: string) => {
    if (!selectedDepartment) return;
    if (!confirm("이 부서에서 사용자를 제외하시겠습니까?")) return;

    try {
      const response = await departmentAPI.removeDepartmentMember(
        selectedDepartment.dept_code,
        userId
      );

      if (response.success) {
        loadMembers();
      } else {
        alert(response.error || "부서원 제거에 실패했습니다.");
      }
    } catch (error) {
      console.error("부서원 제거 실패:", error);
      alert("부서원 제거 중 오류가 발생했습니다.");
    }
  };

  // 주 부서 설정
  const handleSetPrimaryDepartment = async (userId: string) => {
    if (!selectedDepartment) return;

    try {
      const response = await departmentAPI.setPrimaryDepartment(
        selectedDepartment.dept_code,
        userId
      );

      if (response.success) {
        loadMembers();
      } else {
        alert(response.error || "주 부서 설정에 실패했습니다.");
      }
    } catch (error) {
      console.error("주 부서 설정 실패:", error);
      alert("주 부서 설정 중 오류가 발생했습니다.");
    }
  };

  if (!selectedDepartment) {
    return (
      <div className="flex h-64 flex-col items-center justify-center rounded-lg border bg-card p-8 shadow-sm">
        <p className="text-sm text-muted-foreground">좌측에서 부서를 선택하세요</p>
      </div>
    );
  }

  return (
    <div className="space-y-4">
      {/* 헤더 */}
      <div className="flex items-center justify-between">
        <div>
          <h3 className="text-lg font-semibold">{selectedDepartment.dept_name}</h3>
          <p className="text-sm text-muted-foreground">부서원 {members.length}명</p>
        </div>
        <Button size="sm" className="h-9 gap-2 text-sm" onClick={() => setIsAddModalOpen(true)}>
          <Plus className="h-4 w-4" />
          부서원 추가
        </Button>
      </div>

      {/* 부서원 목록 */}
      <div className="space-y-2 rounded-lg border bg-card p-4 shadow-sm">
        {isLoading ? (
          <div className="py-8 text-center text-sm text-muted-foreground">로딩 중...</div>
        ) : members.length === 0 ? (
          <div className="py-8 text-center text-sm text-muted-foreground">
            부서원이 없습니다. 부서원을 추가해주세요.
          </div>
        ) : (
          <div className="space-y-2">
            {members.map((member) => (
              <div
                key={member.user_id}
                className="flex items-center justify-between rounded-lg border bg-background p-3 transition-colors hover:bg-muted/50"
              >
                <div className="flex-1">
                  <div className="flex items-center gap-2">
                    <span className="font-medium">{member.user_name}</span>
                    <span className="text-sm text-muted-foreground">({member.user_id})</span>
                    {member.is_primary && (
                      <Badge variant="default" className="h-5 gap-1 text-xs">
                        <Star className="h-3 w-3" />
                        주 부서
                      </Badge>
                    )}
                  </div>
                  <div className="mt-1 flex gap-4 text-xs text-muted-foreground">
                    {member.position_name && <span>직책: {member.position_name}</span>}
                    {member.email && <span>이메일: {member.email}</span>}
                    {member.phone && <span>전화: {member.phone}</span>}
                    {member.cell_phone && <span>휴대폰: {member.cell_phone}</span>}
                  </div>
                </div>

                <div className="flex gap-2">
                  {!member.is_primary && (
                    <Button
                      variant="outline"
                      size="sm"
                      className="h-8 gap-1 text-xs"
                      onClick={() => handleSetPrimaryDepartment(member.user_id)}
                    >
                      <Star className="h-3 w-3" />
                      주 부서 설정
                    </Button>
                  )}
                  <Button
                    variant="ghost"
                    size="icon"
                    className="h-8 w-8 text-destructive"
                    onClick={() => handleRemoveMember(member.user_id)}
                  >
                    <X className="h-4 w-4" />
                  </Button>
                </div>
              </div>
            ))}
          </div>
        )}
      </div>

      {/* 부서원 추가 모달 */}
      <Dialog open={isAddModalOpen} onOpenChange={setIsAddModalOpen}>
        <DialogContent className="sm:max-w-[425px]">
          <DialogHeader>
            <DialogTitle>부서원 추가</DialogTitle>
          </DialogHeader>

          <div className="space-y-4 py-4">
            <div className="space-y-2">
              <Label htmlFor="user_id">
                사용자 ID <span className="text-destructive">*</span>
              </Label>
              <Input
                id="user_id"
                value={searchUserId}
                onChange={(e) => setSearchUserId(e.target.value)}
                placeholder="사용자 ID를 입력하세요"
                autoFocus
              />
              <p className="text-xs text-muted-foreground">
                겸직이 가능합니다. 한 사용자를 여러 부서에 추가할 수 있습니다.
              </p>
            </div>
          </div>

          <DialogFooter>
            <Button variant="outline" onClick={() => setIsAddModalOpen(false)}>
              취소
            </Button>
            <Button onClick={handleAddMember} disabled={!searchUserId.trim()}>
              추가
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}