"use client";

import { useState, useEffect, useCallback } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Textarea } from "@/components/ui/textarea";
import { toast } from "sonner";
import { Plus, Pencil, Trash2, Link2, Database } from "lucide-react";
import {
  getFieldJoins,
  createFieldJoin,
  updateFieldJoin,
  deleteFieldJoin,
  FieldJoin,
} from "@/lib/api/screenGroup";

interface FieldJoinPanelProps {
  screenId: number;
  componentId?: string;
  layoutId?: number;
}

export default function FieldJoinPanel({ screenId, componentId, layoutId }: FieldJoinPanelProps) {
  // 상태 관리
  const [fieldJoins, setFieldJoins] = useState<FieldJoin[]>([]);
  const [loading, setLoading] = useState(false);
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [selectedJoin, setSelectedJoin] = useState<FieldJoin | null>(null);
  const [formData, setFormData] = useState({
    field_name: "",
    save_table: "",
    save_column: "",
    join_table: "",
    join_column: "",
    display_column: "",
    join_type: "LEFT",
    filter_condition: "",
    sort_column: "",
    sort_direction: "ASC",
    is_active: "Y",
  });

  // 데이터 로드
  const loadFieldJoins = useCallback(async () => {
    if (!screenId) return;
    
    setLoading(true);
    try {
      const response = await getFieldJoins(screenId);
      if (response.success && response.data) {
        // 현재 컴포넌트에 해당하는 조인만 필터링
        const filtered = componentId 
          ? response.data.filter(join => join.component_id === componentId)
          : response.data;
        setFieldJoins(filtered);
      }
    } catch (error) {
      console.error("필드 조인 로드 실패:", error);
    } finally {
      setLoading(false);
    }
  }, [screenId, componentId]);

  useEffect(() => {
    loadFieldJoins();
  }, [loadFieldJoins]);

  // 모달 열기
  const openModal = (join?: FieldJoin) => {
    if (join) {
      setSelectedJoin(join);
      setFormData({
        field_name: join.field_name || "",
        save_table: join.save_table,
        save_column: join.save_column,
        join_table: join.join_table,
        join_column: join.join_column,
        display_column: join.display_column,
        join_type: join.join_type,
        filter_condition: join.filter_condition || "",
        sort_column: join.sort_column || "",
        sort_direction: join.sort_direction || "ASC",
        is_active: join.is_active,
      });
    } else {
      setSelectedJoin(null);
      setFormData({
        field_name: "",
        save_table: "",
        save_column: "",
        join_table: "",
        join_column: "",
        display_column: "",
        join_type: "LEFT",
        filter_condition: "",
        sort_column: "",
        sort_direction: "ASC",
        is_active: "Y",
      });
    }
    setIsModalOpen(true);
  };

  // 저장
  const handleSave = async () => {
    if (!formData.save_table || !formData.save_column || !formData.join_table || !formData.join_column || !formData.display_column) {
      toast.error("필수 필드를 모두 입력해주세요.");
      return;
    }

    try {
      const payload = {
        screen_id: screenId,
        layout_id: layoutId,
        component_id: componentId,
        ...formData,
      };

      let response;
      if (selectedJoin) {
        response = await updateFieldJoin(selectedJoin.id, payload);
      } else {
        response = await createFieldJoin(payload);
      }

      if (response.success) {
        toast.success(selectedJoin ? "조인 설정이 수정되었습니다." : "조인 설정이 추가되었습니다.");
        setIsModalOpen(false);
        loadFieldJoins();
      } else {
        toast.error(response.message || "저장에 실패했습니다.");
      }
    } catch (error) {
      toast.error("저장 중 오류가 발생했습니다.");
    }
  };

  // 삭제
  const handleDelete = async (id: number) => {
    if (!confirm("이 조인 설정을 삭제하시겠습니까?")) return;

    try {
      const response = await deleteFieldJoin(id);
      if (response.success) {
        toast.success("조인 설정이 삭제되었습니다.");
        loadFieldJoins();
      } else {
        toast.error(response.message || "삭제에 실패했습니다.");
      }
    } catch (error) {
      toast.error("삭제 중 오류가 발생했습니다.");
    }
  };

  return (
    <div className="space-y-4">
      {/* 헤더 */}
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-2">
          <Link2 className="h-4 w-4 text-primary" />
          <h3 className="text-sm font-semibold">필드 조인 설정</h3>
        </div>
        <Button variant="outline" size="sm" onClick={() => openModal()} className="h-8 gap-1 text-xs">
          <Plus className="h-3 w-3" />
          추가
        </Button>
      </div>

      {/* 설명 */}
      <p className="text-xs text-muted-foreground">
        이 필드가 다른 테이블의 값을 참조하여 표시할 때 조인 설정을 추가하세요.
      </p>

      {/* 조인 목록 */}
      {loading ? (
        <div className="flex items-center justify-center py-8">
          <div className="h-6 w-6 animate-spin rounded-full border-2 border-primary border-t-transparent" />
        </div>
      ) : fieldJoins.length === 0 ? (
        <div className="flex flex-col items-center justify-center rounded-lg border border-dashed py-8">
          <Database className="h-8 w-8 text-muted-foreground/50" />
          <p className="mt-2 text-xs text-muted-foreground">설정된 조인이 없습니다</p>
        </div>
      ) : (
        <div className="rounded-lg border">
          <Table>
            <TableHeader>
              <TableRow className="bg-muted/50">
                <TableHead className="h-8 text-xs">저장 테이블.컬럼</TableHead>
                <TableHead className="h-8 text-xs">조인 테이블.컬럼</TableHead>
                <TableHead className="h-8 text-xs">표시 컬럼</TableHead>
                <TableHead className="h-8 w-[60px] text-xs">관리</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {fieldJoins.map((join) => (
                <TableRow key={join.id} className="text-xs">
                  <TableCell className="py-2">
                    <span className="font-mono">{join.save_table}.{join.save_column}</span>
                  </TableCell>
                  <TableCell className="py-2">
                    <span className="font-mono">{join.join_table}.{join.join_column}</span>
                  </TableCell>
                  <TableCell className="py-2">
                    <span className="font-mono">{join.display_column}</span>
                  </TableCell>
                  <TableCell className="py-2">
                    <div className="flex items-center gap-1">
                      <Button variant="ghost" size="icon" className="h-6 w-6" onClick={() => openModal(join)}>
                        <Pencil className="h-3 w-3" />
                      </Button>
                      <Button 
                        variant="ghost" 
                        size="icon" 
                        className="h-6 w-6 text-destructive hover:text-destructive" 
                        onClick={() => handleDelete(join.id)}
                      >
                        <Trash2 className="h-3 w-3" />
                      </Button>
                    </div>
                  </TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        </div>
      )}

      {/* 추가/수정 모달 */}
      <Dialog open={isModalOpen} onOpenChange={setIsModalOpen}>
        <DialogContent className="max-w-[95vw] sm:max-w-[600px]">
          <DialogHeader>
            <DialogTitle className="text-base sm:text-lg">
              {selectedJoin ? "조인 설정 수정" : "조인 설정 추가"}
            </DialogTitle>
            <DialogDescription className="text-xs sm:text-sm">
              필드가 참조할 테이블과 컬럼을 설정합니다
            </DialogDescription>
          </DialogHeader>

          <div className="space-y-4">
            {/* 필드명 */}
            <div>
              <Label className="text-xs sm:text-sm">필드명</Label>
              <Input
                value={formData.field_name}
                onChange={(e) => setFormData({ ...formData, field_name: e.target.value })}
                placeholder="화면에 표시될 필드명"
                className="h-8 text-xs sm:h-10 sm:text-sm"
              />
            </div>

            {/* 저장 테이블/컬럼 */}
            <div className="grid grid-cols-2 gap-4">
              <div>
                <Label className="text-xs sm:text-sm">저장 테이블 *</Label>
                <Input
                  value={formData.save_table}
                  onChange={(e) => setFormData({ ...formData, save_table: e.target.value })}
                  placeholder="예: work_orders"
                  className="h-8 font-mono text-xs sm:h-10 sm:text-sm"
                />
              </div>
              <div>
                <Label className="text-xs sm:text-sm">저장 컬럼 *</Label>
                <Input
                  value={formData.save_column}
                  onChange={(e) => setFormData({ ...formData, save_column: e.target.value })}
                  placeholder="예: item_code"
                  className="h-8 font-mono text-xs sm:h-10 sm:text-sm"
                />
              </div>
            </div>

            {/* 조인 테이블/컬럼 */}
            <div className="grid grid-cols-2 gap-4">
              <div>
                <Label className="text-xs sm:text-sm">조인 테이블 *</Label>
                <Input
                  value={formData.join_table}
                  onChange={(e) => setFormData({ ...formData, join_table: e.target.value })}
                  placeholder="예: item_mng"
                  className="h-8 font-mono text-xs sm:h-10 sm:text-sm"
                />
              </div>
              <div>
                <Label className="text-xs sm:text-sm">조인 컬럼 *</Label>
                <Input
                  value={formData.join_column}
                  onChange={(e) => setFormData({ ...formData, join_column: e.target.value })}
                  placeholder="예: id"
                  className="h-8 font-mono text-xs sm:h-10 sm:text-sm"
                />
              </div>
            </div>

            {/* 표시 컬럼 */}
            <div>
              <Label className="text-xs sm:text-sm">표시 컬럼 *</Label>
              <Input
                value={formData.display_column}
                onChange={(e) => setFormData({ ...formData, display_column: e.target.value })}
                placeholder="예: item_name (화면에 표시될 컬럼)"
                className="h-8 font-mono text-xs sm:h-10 sm:text-sm"
              />
            </div>

            {/* 조인 타입/정렬 */}
            <div className="grid grid-cols-3 gap-4">
              <div>
                <Label className="text-xs sm:text-sm">조인 타입</Label>
                <Select
                  value={formData.join_type}
                  onValueChange={(value) => setFormData({ ...formData, join_type: value })}
                >
                  <SelectTrigger className="h-8 text-xs sm:h-10 sm:text-sm">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="LEFT">LEFT JOIN</SelectItem>
                    <SelectItem value="INNER">INNER JOIN</SelectItem>
                    <SelectItem value="RIGHT">RIGHT JOIN</SelectItem>
                  </SelectContent>
                </Select>
              </div>
              <div>
                <Label className="text-xs sm:text-sm">정렬 컬럼</Label>
                <Input
                  value={formData.sort_column}
                  onChange={(e) => setFormData({ ...formData, sort_column: e.target.value })}
                  placeholder="예: name"
                  className="h-8 font-mono text-xs sm:h-10 sm:text-sm"
                />
              </div>
              <div>
                <Label className="text-xs sm:text-sm">정렬 방향</Label>
                <Select
                  value={formData.sort_direction}
                  onValueChange={(value) => setFormData({ ...formData, sort_direction: value })}
                >
                  <SelectTrigger className="h-8 text-xs sm:h-10 sm:text-sm">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="ASC">오름차순</SelectItem>
                    <SelectItem value="DESC">내림차순</SelectItem>
                  </SelectContent>
                </Select>
              </div>
            </div>

            {/* 필터 조건 */}
            <div>
              <Label className="text-xs sm:text-sm">필터 조건 (선택)</Label>
              <Textarea
                value={formData.filter_condition}
                onChange={(e) => setFormData({ ...formData, filter_condition: e.target.value })}
                placeholder="예: is_active = 'Y'"
                className="min-h-[60px] font-mono text-xs sm:text-sm"
              />
            </div>
          </div>

          <DialogFooter className="gap-2 sm:gap-0">
            <Button
              variant="outline"
              onClick={() => setIsModalOpen(false)}
              className="h-8 flex-1 text-xs sm:h-10 sm:flex-none sm:text-sm"
            >
              취소
            </Button>
            <Button
              onClick={handleSave}
              className="h-8 flex-1 text-xs sm:h-10 sm:flex-none sm:text-sm"
            >
              {selectedJoin ? "수정" : "추가"}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}