"use client";

/**
 * V2Select 설정 패널
 * 통합 선택 컴포넌트의 세부 설정을 관리합니다.
 */

import React, { useState, useEffect, useCallback } from "react";
import { Label } from "@/components/ui/label";
import { Input } from "@/components/ui/input";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { Separator } from "@/components/ui/separator";
import { Checkbox } from "@/components/ui/checkbox";
import { Button } from "@/components/ui/button";
import { Plus, Trash2, Loader2 } from "lucide-react";
import { apiClient } from "@/lib/api/client";

interface ColumnOption {
  columnName: string;
  columnLabel: string;
}

interface CategoryValueOption {
  valueCode: string;
  valueLabel: string;
}

interface V2SelectConfigPanelProps {
  config: Record<string, any>;
  onChange: (config: Record<string, any>) => void;
  /** 컬럼의 inputType (entity/category 타입 확인용) */
  inputType?: string;
  /** 현재 테이블명 (카테고리 값 조회용) */
  tableName?: string;
  /** 현재 컬럼명 (카테고리 값 조회용) */
  columnName?: string;
}

export const V2SelectConfigPanel: React.FC<V2SelectConfigPanelProps> = ({
  config,
  onChange,
  inputType,
  tableName,
  columnName,
}) => {
  const isEntityType = inputType === "entity";
  const isCategoryType = inputType === "category";

  const [entityColumns, setEntityColumns] = useState<ColumnOption[]>([]);
  const [loadingColumns, setLoadingColumns] = useState(false);

  // 카테고리 값 목록
  const [categoryValues, setCategoryValues] = useState<CategoryValueOption[]>([]);
  const [loadingCategoryValues, setLoadingCategoryValues] = useState(false);

  const updateConfig = (field: string, value: any) => {
    onChange({ ...config, [field]: value });
  };

  // 카테고리 타입이면 source를 자동으로 category로 설정
  useEffect(() => {
    if (isCategoryType && config.source !== "category") {
      onChange({ ...config, source: "category" });
    }
  }, [isCategoryType]);

  // 카테고리 값 로드
  const loadCategoryValues = useCallback(async (catTable: string, catColumn: string) => {
    if (!catTable || !catColumn) {
      setCategoryValues([]);
      return;
    }

    setLoadingCategoryValues(true);
    try {
      const response = await apiClient.get(`/table-categories/${catTable}/${catColumn}/values`);
      const data = response.data;
      if (data.success && data.data) {
        const flattenTree = (items: any[], depth: number = 0): CategoryValueOption[] => {
          const result: CategoryValueOption[] = [];
          for (const item of items) {
            result.push({
              valueCode: item.valueCode,
              valueLabel: depth > 0 ? `${"  ".repeat(depth)}${item.valueLabel}` : item.valueLabel,
            });
            if (item.children && item.children.length > 0) {
              result.push(...flattenTree(item.children, depth + 1));
            }
          }
          return result;
        };
        setCategoryValues(flattenTree(data.data));
      }
    } catch (error) {
      console.error("카테고리 값 조회 실패:", error);
      setCategoryValues([]);
    } finally {
      setLoadingCategoryValues(false);
    }
  }, []);

  // 카테고리 소스일 때 값 로드
  useEffect(() => {
    if (config.source === "category") {
      const catTable = config.categoryTable || tableName;
      const catColumn = config.categoryColumn || columnName;
      if (catTable && catColumn) {
        loadCategoryValues(catTable, catColumn);
      }
    }
  }, [config.source, config.categoryTable, config.categoryColumn, tableName, columnName, loadCategoryValues]);

  // 엔티티 테이블 변경 시 컬럼 목록 조회
  const loadEntityColumns = useCallback(async (tblName: string) => {
    if (!tblName) {
      setEntityColumns([]);
      return;
    }

    setLoadingColumns(true);
    try {
      const response = await apiClient.get(`/table-management/tables/${tblName}/columns?size=500`);
      const data = response.data.data || response.data;
      const columns = data.columns || data || [];

      const columnOptions: ColumnOption[] = columns.map((col: any) => {
        const name = col.columnName || col.column_name || col.name;
        const label = col.displayName || col.display_name || col.columnLabel || col.column_label || name;

        return {
          columnName: name,
          columnLabel: label,
        };
      });

      setEntityColumns(columnOptions);
    } catch (error) {
      console.error("컬럼 목록 조회 실패:", error);
      setEntityColumns([]);
    } finally {
      setLoadingColumns(false);
    }
  }, []);

  useEffect(() => {
    if (config.source === "entity" && config.entityTable) {
      loadEntityColumns(config.entityTable);
    }
  }, [config.source, config.entityTable, loadEntityColumns]);

  // 정적 옵션 관리
  const options = config.options || [];

  const addOption = () => {
    const newOptions = [...options, { value: "", label: "" }];
    updateConfig("options", newOptions);
  };

  const updateOptionValue = (index: number, value: string) => {
    const newOptions = [...options];
    newOptions[index] = { ...newOptions[index], value, label: value };
    updateConfig("options", newOptions);
  };

  const removeOption = (index: number) => {
    const newOptions = options.filter((_: any, i: number) => i !== index);
    updateConfig("options", newOptions);
  };

  // 현재 source 결정 (카테고리 타입이면 강제 category)
  const effectiveSource = isCategoryType ? "category" : config.source || "static";

  return (
    <div className="space-y-4">
      {/* 선택 모드 */}
      <div className="space-y-2">
        <Label className="text-xs font-medium">선택 모드</Label>
        <Select value={config.mode || "dropdown"} onValueChange={(value) => updateConfig("mode", value)}>
          <SelectTrigger className="h-8 text-xs">
            <SelectValue placeholder="모드 선택" />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="dropdown">드롭다운</SelectItem>
            <SelectItem value="combobox">콤보박스 (검색)</SelectItem>
            <SelectItem value="radio">라디오 버튼</SelectItem>
            <SelectItem value="check">체크박스</SelectItem>
            <SelectItem value="tag">태그 선택</SelectItem>
            <SelectItem value="tagbox">태그박스 (태그+드롭다운)</SelectItem>
            <SelectItem value="toggle">토글 스위치</SelectItem>
            <SelectItem value="swap">스왑 선택</SelectItem>
          </SelectContent>
        </Select>
      </div>

      <Separator />

      {/* 데이터 소스 */}
      <div className="space-y-2">
        <Label className="text-xs font-medium">데이터 소스</Label>
        {isCategoryType ? (
          <div className="bg-muted flex h-8 items-center rounded-md px-3">
            <span className="text-xs font-medium text-emerald-600">카테고리 (자동 설정)</span>
          </div>
        ) : (
          <Select value={config.source || "static"} onValueChange={(value) => updateConfig("source", value)}>
            <SelectTrigger className="h-8 text-xs">
              <SelectValue placeholder="소스 선택" />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="static">정적 옵션</SelectItem>
              <SelectItem value="code">공통 코드</SelectItem>
              <SelectItem value="category">카테고리</SelectItem>
              {isEntityType && <SelectItem value="entity">엔티티</SelectItem>}
            </SelectContent>
          </Select>
        )}
      </div>

      {/* 카테고리 설정 */}
      {effectiveSource === "category" && (
        <div className="space-y-3">
          <div className="space-y-1">
            <Label className="text-xs font-medium">카테고리 정보</Label>
            <div className="bg-muted rounded-md p-2">
              <div className="grid grid-cols-2 gap-2">
                <div>
                  <p className="text-muted-foreground text-[10px]">테이블</p>
                  <p className="text-xs font-medium">{config.categoryTable || tableName || "-"}</p>
                </div>
                <div>
                  <p className="text-muted-foreground text-[10px]">컬럼</p>
                  <p className="text-xs font-medium">{config.categoryColumn || columnName || "-"}</p>
                </div>
              </div>
            </div>
          </div>

          {/* 카테고리 값 로딩 중 */}
          {loadingCategoryValues && (
            <div className="text-muted-foreground flex items-center gap-2 text-xs">
              <Loader2 className="h-3 w-3 animate-spin" />
              카테고리 값 로딩 중...
            </div>
          )}

          {/* 카테고리 값 목록 표시 */}
          {categoryValues.length > 0 && (
            <div className="space-y-2">
              <Label className="text-xs font-medium">카테고리 값 ({categoryValues.length}개)</Label>
              <div className="bg-muted max-h-32 space-y-0.5 overflow-y-auto rounded-md p-1.5">
                {categoryValues.map((cv) => (
                  <div key={cv.valueCode} className="flex items-center gap-2 px-1.5 py-0.5">
                    <span className="text-muted-foreground shrink-0 font-mono text-[10px]">{cv.valueCode}</span>
                    <span className="truncate text-xs">{cv.valueLabel}</span>
                  </div>
                ))}
              </div>
            </div>
          )}

          {/* 기본값 설정 */}
          {categoryValues.length > 0 && (
            <div className="border-t pt-2">
              <Label className="text-xs font-medium">기본값</Label>
              <Select
                value={config.defaultValue || "_none_"}
                onValueChange={(value) => updateConfig("defaultValue", value === "_none_" ? "" : value)}
              >
                <SelectTrigger className="mt-1 h-8 text-xs">
                  <SelectValue placeholder="기본값 선택" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="_none_">선택 안함</SelectItem>
                  {categoryValues.map((cv) => (
                    <SelectItem key={cv.valueCode} value={cv.valueCode}>
                      {cv.valueLabel}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
              <p className="text-muted-foreground mt-1 text-[10px]">화면 로드 시 자동 선택될 카테고리 값</p>
            </div>
          )}

          {/* 카테고리 값 없음 안내 */}
          {!loadingCategoryValues && categoryValues.length === 0 && (
            <p className="text-[10px] text-amber-600">
              카테고리 값이 없습니다. 테이블 카테고리 관리에서 값을 추가해주세요.
            </p>
          )}
        </div>
      )}

      {/* 정적 옵션 관리 */}
      {effectiveSource === "static" && (
        <div className="space-y-2">
          <div className="flex items-center justify-between">
            <Label className="text-xs font-medium">옵션 목록</Label>
            <Button type="button" variant="ghost" size="sm" onClick={addOption} className="h-6 px-2 text-xs">
              <Plus className="mr-1 h-3 w-3" />
              추가
            </Button>
          </div>
          <div className="max-h-40 space-y-1.5 overflow-y-auto">
            {options.map((option: any, index: number) => (
              <div key={index} className="flex items-center gap-1.5">
                <Input
                  value={option.value || ""}
                  onChange={(e) => updateOptionValue(index, e.target.value)}
                  placeholder={`옵션 ${index + 1}`}
                  className="h-7 flex-1 text-xs"
                />
                <Button
                  type="button"
                  variant="ghost"
                  size="sm"
                  onClick={() => removeOption(index)}
                  className="text-destructive h-7 w-7 shrink-0 p-0"
                >
                  <Trash2 className="h-3 w-3" />
                </Button>
              </div>
            ))}
            {options.length === 0 && (
              <p className="text-muted-foreground py-2 text-center text-xs">옵션을 추가해주세요</p>
            )}
          </div>

          {/* 기본값 설정 */}
          {options.length > 0 && (
            <div className="mt-3 border-t pt-2">
              <Label className="text-xs font-medium">기본값</Label>
              <Select
                value={config.defaultValue || "_none_"}
                onValueChange={(value) => updateConfig("defaultValue", value === "_none_" ? "" : value)}
              >
                <SelectTrigger className="mt-1 h-8 text-xs">
                  <SelectValue placeholder="기본값 선택" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="_none_">선택 안함</SelectItem>
                  {options.map((option: any, index: number) => (
                    <SelectItem key={`default-${index}`} value={option.value || `_idx_${index}`}>
                      {option.label || option.value || `옵션 ${index + 1}`}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
              <p className="text-muted-foreground mt-1 text-[10px]">화면 로드 시 자동 선택될 값</p>
            </div>
          )}
        </div>
      )}

      {/* 공통 코드 설정 */}
      {effectiveSource === "code" && (
        <div className="space-y-1">
          <Label className="text-xs font-medium">코드 그룹</Label>
          {config.codeGroup ? (
            <p className="text-foreground text-sm font-medium">{config.codeGroup}</p>
          ) : (
            <p className="text-xs text-amber-600">테이블 타입 관리에서 코드 그룹을 설정해주세요</p>
          )}
        </div>
      )}

      {/* 엔티티(참조 테이블) 설정 */}
      {effectiveSource === "entity" && (
        <div className="space-y-3">
          <div className="space-y-2">
            <Label className="text-xs font-medium">참조 테이블</Label>
            <Input
              value={config.entityTable || ""}
              readOnly
              disabled
              placeholder="테이블 타입 관리에서 설정"
              className="bg-muted h-8 text-xs"
            />
            <p className="text-muted-foreground text-[10px]">
              조인할 테이블명 (테이블 타입 관리에서 설정된 경우 자동 입력됨)
            </p>
          </div>

          {loadingColumns && (
            <div className="text-muted-foreground flex items-center gap-2 text-xs">
              <Loader2 className="h-3 w-3 animate-spin" />
              컬럼 목록 로딩 중...
            </div>
          )}

          <div className="grid grid-cols-2 gap-2">
            <div className="space-y-2">
              <Label className="text-xs font-medium">값 컬럼 (코드)</Label>
              {entityColumns.length > 0 ? (
                <Select
                  value={config.entityValueColumn || ""}
                  onValueChange={(value) => updateConfig("entityValueColumn", value)}
                >
                  <SelectTrigger className="h-8 text-xs">
                    <SelectValue placeholder="컬럼 선택" />
                  </SelectTrigger>
                  <SelectContent>
                    {entityColumns.map((col) => (
                      <SelectItem key={col.columnName} value={col.columnName}>
                        {col.columnLabel || col.columnName}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              ) : (
                <Input
                  value={config.entityValueColumn || ""}
                  onChange={(e) => updateConfig("entityValueColumn", e.target.value)}
                  placeholder="id"
                  className="h-8 text-xs"
                />
              )}
              <p className="text-muted-foreground text-[10px]">저장될 값</p>
            </div>
            <div className="space-y-2">
              <Label className="text-xs font-medium">표시 컬럼</Label>
              {entityColumns.length > 0 ? (
                <Select
                  value={config.entityLabelColumn || ""}
                  onValueChange={(value) => updateConfig("entityLabelColumn", value)}
                >
                  <SelectTrigger className="h-8 text-xs">
                    <SelectValue placeholder="컬럼 선택" />
                  </SelectTrigger>
                  <SelectContent>
                    {entityColumns.map((col) => (
                      <SelectItem key={col.columnName} value={col.columnName}>
                        {col.columnLabel || col.columnName}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              ) : (
                <Input
                  value={config.entityLabelColumn || ""}
                  onChange={(e) => updateConfig("entityLabelColumn", e.target.value)}
                  placeholder="name"
                  className="h-8 text-xs"
                />
              )}
              <p className="text-muted-foreground text-[10px]">화면에 표시될 값</p>
            </div>
          </div>

          {config.entityTable && !loadingColumns && entityColumns.length === 0 && (
            <p className="text-[10px] text-amber-600">
              테이블 컬럼을 조회할 수 없습니다. 테이블 타입 관리에서 참조 테이블을 설정해주세요.
            </p>
          )}

          {config.entityTable && entityColumns.length > 0 && (
            <div className="border-t pt-3">
              <p className="text-muted-foreground text-[10px]">
                같은 폼에 참조 테이블({config.entityTable})의 컬럼이 배치되어 있으면, 엔티티 선택 시 해당 필드가 자동으로
                채워집니다.
              </p>
            </div>
          )}
        </div>
      )}

      <Separator />

      {/* 추가 옵션 */}
      <div className="space-y-3">
        <Label className="text-xs font-medium">추가 옵션</Label>

        <div className="flex items-center space-x-2">
          <Checkbox
            id="multiple"
            checked={config.multiple || false}
            onCheckedChange={(checked) => updateConfig("multiple", checked)}
          />
          <label htmlFor="multiple" className="text-xs">
            다중 선택 허용
          </label>
        </div>

        <div className="flex items-center space-x-2">
          <Checkbox
            id="searchable"
            checked={config.searchable || false}
            onCheckedChange={(checked) => updateConfig("searchable", checked)}
          />
          <label htmlFor="searchable" className="text-xs">
            검색 기능
          </label>
        </div>

        <div className="flex items-center space-x-2">
          <Checkbox
            id="allowClear"
            checked={config.allowClear !== false}
            onCheckedChange={(checked) => updateConfig("allowClear", checked)}
          />
          <label htmlFor="allowClear" className="text-xs">
            값 초기화 허용
          </label>
        </div>
      </div>

      {/* 다중 선택 시 최대 개수 */}
      {config.multiple && (
        <div className="space-y-2">
          <Label className="text-xs font-medium">최대 선택 개수</Label>
          <Input
            type="number"
            value={config.maxSelect ?? ""}
            onChange={(e) => updateConfig("maxSelect", e.target.value ? Number(e.target.value) : undefined)}
            placeholder="제한 없음"
            min="1"
            className="h-8 text-xs"
          />
        </div>
      )}
    </div>
  );
};

V2SelectConfigPanel.displayName = "V2SelectConfigPanel";

export default V2SelectConfigPanel;