"use client";

import React, { useState, useEffect } from "react";
import { Label } from "@/components/ui/label";
import { Input } from "@/components/ui/input";
import { Switch } from "@/components/ui/switch";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { apiClient } from "@/lib/api/client";

interface LocationSwapSelectorConfigPanelProps {
  config: any;
  onChange: (config: any) => void;
  tableColumns?: Array<{ columnName: string; columnLabel?: string; dataType?: string }>;
  screenTableName?: string;
}

/**
 * LocationSwapSelector 설정 패널
 */
export function LocationSwapSelectorConfigPanel({
  config,
  onChange,
  tableColumns = [],
  screenTableName,
}: LocationSwapSelectorConfigPanelProps) {
  const [tables, setTables] = useState<Array<{ name: string; label: string }>>([]);
  const [columns, setColumns] = useState<Array<{ name: string; label: string }>>([]);
  const [codeCategories, setCodeCategories] = useState<Array<{ value: string; label: string }>>([]);

  // 테이블 목록 로드
  useEffect(() => {
    const loadTables = async () => {
      try {
        const response = await apiClient.get("/table-management/tables");
        if (response.data.success && response.data.data) {
          setTables(
            response.data.data.map((t: any) => ({
              name: t.tableName || t.table_name,
              label: t.displayName || t.tableLabel || t.table_label || t.tableName || t.table_name,
            }))
          );
        }
      } catch (error) {
        console.error("테이블 목록 로드 실패:", error);
      }
    };
    loadTables();
  }, []);

  // 선택된 테이블의 컬럼 로드
  useEffect(() => {
    const loadColumns = async () => {
      const tableName = config?.dataSource?.tableName;
      if (!tableName) {
        setColumns([]);
        return;
      }

      try {
        const response = await apiClient.get(`/table-management/tables/${tableName}/columns`);
        if (response.data.success) {
          // API 응답 구조 처리: data가 배열이거나 data.columns가 배열일 수 있음
          let columnData = response.data.data;
          if (!Array.isArray(columnData) && columnData?.columns) {
            columnData = columnData.columns;
          }
          
          if (Array.isArray(columnData)) {
            setColumns(
              columnData.map((c: any) => ({
                name: c.columnName || c.column_name || c.name,
                label: c.displayName || c.columnLabel || c.column_label || c.columnName || c.column_name || c.name,
              }))
            );
          }
        }
      } catch (error) {
        console.error("컬럼 목록 로드 실패:", error);
      }
    };

    if (config?.dataSource?.type === "table") {
      loadColumns();
    }
  }, [config?.dataSource?.tableName, config?.dataSource?.type]);

  // 코드 카테고리 로드 (API가 없을 수 있으므로 에러 무시)
  useEffect(() => {
    const loadCodeCategories = async () => {
      try {
        const response = await apiClient.get("/code-management/categories");
        if (response.data.success && response.data.data) {
          setCodeCategories(
            response.data.data.map((c: any) => ({
              value: c.category_code || c.categoryCode || c.code,
              label: c.category_name || c.categoryName || c.name,
            }))
          );
        }
      } catch (error: any) {
        // 404는 API가 없는 것이므로 무시
        if (error?.response?.status !== 404) {
          console.error("코드 카테고리 로드 실패:", error);
        }
      }
    };
    loadCodeCategories();
  }, []);

  const handleChange = (path: string, value: any) => {
    const keys = path.split(".");
    const newConfig = { ...config };
    let current: any = newConfig;

    for (let i = 0; i < keys.length - 1; i++) {
      if (!current[keys[i]]) {
        current[keys[i]] = {};
      }
      current = current[keys[i]];
    }

    current[keys[keys.length - 1]] = value;
    onChange(newConfig);
  };

  return (
    <div className="space-y-4">
      {/* 데이터 소스 타입 */}
      <div className="space-y-2">
        <Label>데이터 소스 타입</Label>
        <Select
          value={config?.dataSource?.type || "static"}
          onValueChange={(value) => handleChange("dataSource.type", value)}
        >
          <SelectTrigger>
            <SelectValue placeholder="선택" />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="static">고정 옵션 (포항/광양 등)</SelectItem>
            <SelectItem value="table">테이블에서 가져오기</SelectItem>
            <SelectItem value="code">코드 관리에서 가져오기</SelectItem>
          </SelectContent>
        </Select>
      </div>

      {/* 고정 옵션 설정 (type이 static일 때) */}
      {(!config?.dataSource?.type || config?.dataSource?.type === "static") && (
        <div className="space-y-3 rounded-md bg-amber-50 p-3 dark:bg-amber-950">
          <h4 className="text-sm font-medium">고정 옵션 설정</h4>
          <div className="grid grid-cols-2 gap-2">
            <div className="space-y-2">
              <Label>옵션 1 (값)</Label>
              <Input
                value={config?.dataSource?.staticOptions?.[0]?.value || ""}
                onChange={(e) => {
                  const options = config?.dataSource?.staticOptions || [];
                  const newOptions = [...options];
                  newOptions[0] = { ...newOptions[0], value: e.target.value };
                  handleChange("dataSource.staticOptions", newOptions);
                }}
                placeholder="예: pohang"
                className="h-8 text-xs"
              />
            </div>
            <div className="space-y-2">
              <Label>옵션 1 (표시명)</Label>
              <Input
                value={config?.dataSource?.staticOptions?.[0]?.label || ""}
                onChange={(e) => {
                  const options = config?.dataSource?.staticOptions || [];
                  const newOptions = [...options];
                  newOptions[0] = { ...newOptions[0], label: e.target.value };
                  handleChange("dataSource.staticOptions", newOptions);
                }}
                placeholder="예: 포항"
                className="h-8 text-xs"
              />
            </div>
          </div>
          <div className="grid grid-cols-2 gap-2">
            <div className="space-y-2">
              <Label>옵션 2 (값)</Label>
              <Input
                value={config?.dataSource?.staticOptions?.[1]?.value || ""}
                onChange={(e) => {
                  const options = config?.dataSource?.staticOptions || [];
                  const newOptions = [...options];
                  newOptions[1] = { ...newOptions[1], value: e.target.value };
                  handleChange("dataSource.staticOptions", newOptions);
                }}
                placeholder="예: gwangyang"
                className="h-8 text-xs"
              />
            </div>
            <div className="space-y-2">
              <Label>옵션 2 (표시명)</Label>
              <Input
                value={config?.dataSource?.staticOptions?.[1]?.label || ""}
                onChange={(e) => {
                  const options = config?.dataSource?.staticOptions || [];
                  const newOptions = [...options];
                  newOptions[1] = { ...newOptions[1], label: e.target.value };
                  handleChange("dataSource.staticOptions", newOptions);
                }}
                placeholder="예: 광양"
                className="h-8 text-xs"
              />
            </div>
          </div>
          <p className="text-xs text-amber-700 dark:text-amber-300">
            고정된 2개 장소만 사용할 때 설정하세요. (예: 포항 ↔ 광양)
          </p>
        </div>
      )}

      {/* 테이블 선택 (type이 table일 때) */}
      {config?.dataSource?.type === "table" && (
        <>
          <div className="space-y-2">
            <Label>테이블</Label>
            <Select
              value={config?.dataSource?.tableName || ""}
              onValueChange={(value) => handleChange("dataSource.tableName", value)}
            >
              <SelectTrigger>
                <SelectValue placeholder="테이블 선택" />
              </SelectTrigger>
              <SelectContent>
                {tables.map((table) => (
                  <SelectItem key={table.name} value={table.name}>
                    {table.label}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>

          <div className="grid grid-cols-2 gap-2">
            <div className="space-y-2">
              <Label>값 필드</Label>
              <Select
                value={config?.dataSource?.valueField || ""}
                onValueChange={(value) => handleChange("dataSource.valueField", value)}
              >
                <SelectTrigger>
                  <SelectValue placeholder="선택" />
                </SelectTrigger>
                <SelectContent>
                  {columns.map((col) => (
                    <SelectItem key={col.name} value={col.name}>
                      {col.label}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
            <div className="space-y-2">
              <Label>표시 필드</Label>
              <Select
                value={config?.dataSource?.labelField || ""}
                onValueChange={(value) => handleChange("dataSource.labelField", value)}
              >
                <SelectTrigger>
                  <SelectValue placeholder="선택" />
                </SelectTrigger>
                <SelectContent>
                  {columns.map((col) => (
                    <SelectItem key={col.name} value={col.name}>
                      {col.label}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
          </div>
        </>
      )}

      {/* 코드 카테고리 선택 (type이 code일 때) */}
      {config?.dataSource?.type === "code" && (
        <div className="space-y-2">
          <Label>코드 카테고리</Label>
          <Select
            value={config?.dataSource?.codeCategory || ""}
            onValueChange={(value) => handleChange("dataSource.codeCategory", value)}
          >
            <SelectTrigger>
              <SelectValue placeholder="카테고리 선택" />
            </SelectTrigger>
            <SelectContent>
              {codeCategories.map((cat) => (
                <SelectItem key={cat.value} value={cat.value}>
                  {cat.label}
                </SelectItem>
              ))}
            </SelectContent>
          </Select>
        </div>
      )}

      {/* 필드 매핑 */}
      <div className="space-y-2 border-t pt-4">
        <h4 className="text-sm font-medium">필드 매핑 (저장 위치)</h4>
        {screenTableName && (
          <p className="text-xs text-muted-foreground">
            현재 화면 테이블: <strong>{screenTableName}</strong>
          </p>
        )}
        <div className="grid grid-cols-2 gap-2">
          <div className="space-y-2">
            <Label>출발지 저장 컬럼</Label>
            {tableColumns.length > 0 ? (
              <Select
                value={config?.departureField || ""}
                onValueChange={(value) => handleChange("departureField", value)}
              >
                <SelectTrigger>
                  <SelectValue placeholder="컬럼 선택" />
                </SelectTrigger>
                <SelectContent>
                  {tableColumns.map((col) => (
                    <SelectItem key={col.columnName} value={col.columnName}>
                      {col.columnLabel || col.columnName}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            ) : (
              <Input
                value={config?.departureField || "departure"}
                onChange={(e) => handleChange("departureField", e.target.value)}
                placeholder="departure"
              />
            )}
          </div>
          <div className="space-y-2">
            <Label>도착지 저장 컬럼</Label>
            {tableColumns.length > 0 ? (
              <Select
                value={config?.destinationField || ""}
                onValueChange={(value) => handleChange("destinationField", value)}
              >
                <SelectTrigger>
                  <SelectValue placeholder="컬럼 선택" />
                </SelectTrigger>
                <SelectContent>
                  {tableColumns.map((col) => (
                    <SelectItem key={col.columnName} value={col.columnName}>
                      {col.columnLabel || col.columnName}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            ) : (
              <Input
                value={config?.destinationField || "destination"}
                onChange={(e) => handleChange("destinationField", e.target.value)}
                placeholder="destination"
              />
            )}
          </div>
        </div>
        <div className="grid grid-cols-2 gap-2">
          <div className="space-y-2">
            <Label>출발지명 저장 컬럼 (선택)</Label>
            {tableColumns.length > 0 ? (
              <Select
                value={config?.departureLabelField || "__none__"}
                onValueChange={(value) => handleChange("departureLabelField", value === "__none__" ? "" : value)}
              >
                <SelectTrigger>
                  <SelectValue placeholder="컬럼 선택 (선택사항)" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="__none__">없음</SelectItem>
                  {tableColumns.map((col) => (
                    <SelectItem key={col.columnName} value={col.columnName}>
                      {col.columnLabel || col.columnName}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            ) : (
              <Input
                value={config?.departureLabelField || ""}
                onChange={(e) => handleChange("departureLabelField", e.target.value)}
                placeholder="departure_name"
              />
            )}
          </div>
          <div className="space-y-2">
            <Label>도착지명 저장 컬럼 (선택)</Label>
            {tableColumns.length > 0 ? (
              <Select
                value={config?.destinationLabelField || "__none__"}
                onValueChange={(value) => handleChange("destinationLabelField", value === "__none__" ? "" : value)}
              >
                <SelectTrigger>
                  <SelectValue placeholder="컬럼 선택 (선택사항)" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="__none__">없음</SelectItem>
                  {tableColumns.map((col) => (
                    <SelectItem key={col.columnName} value={col.columnName}>
                      {col.columnLabel || col.columnName}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            ) : (
              <Input
                value={config?.destinationLabelField || ""}
                onChange={(e) => handleChange("destinationLabelField", e.target.value)}
                placeholder="destination_name"
              />
            )}
          </div>
        </div>
      </div>

      {/* UI 설정 */}
      <div className="space-y-2 border-t pt-4">
        <h4 className="text-sm font-medium">UI 설정</h4>
        <div className="grid grid-cols-2 gap-2">
          <div className="space-y-2">
            <Label>출발지 라벨</Label>
            <Input
              value={config?.departureLabel || "출발지"}
              onChange={(e) => handleChange("departureLabel", e.target.value)}
            />
          </div>
          <div className="space-y-2">
            <Label>도착지 라벨</Label>
            <Input
              value={config?.destinationLabel || "도착지"}
              onChange={(e) => handleChange("destinationLabel", e.target.value)}
            />
          </div>
        </div>

        <div className="space-y-2">
          <Label>스타일</Label>
          <Select
            value={config?.variant || "card"}
            onValueChange={(value) => handleChange("variant", value)}
          >
            <SelectTrigger>
              <SelectValue />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="card">카드 (이미지 참고)</SelectItem>
              <SelectItem value="inline">인라인</SelectItem>
              <SelectItem value="minimal">미니멀</SelectItem>
            </SelectContent>
          </Select>
        </div>

        <div className="flex items-center justify-between">
          <Label>교환 버튼 표시</Label>
          <Switch
            checked={config?.showSwapButton !== false}
            onCheckedChange={(checked) => handleChange("showSwapButton", checked)}
          />
        </div>
      </div>

      {/* 안내 */}
      <div className="rounded-md bg-blue-50 p-3 dark:bg-blue-950">
        <p className="text-xs text-blue-900 dark:text-blue-100">
          <strong>사용 방법:</strong>
          <br />
          1. 데이터 소스에서 장소 목록을 가져올 위치를 선택합니다
          <br />
          2. 출발지/도착지 값이 저장될 필드를 지정합니다
          <br />
          3. 교환 버튼을 클릭하면 출발지와 도착지가 바뀝니다
        </p>
      </div>
    </div>
  );
}