"use client";

import React, { useState, useEffect } from "react";
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from "@/components/ui/dialog";
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 { Badge } from "@/components/ui/badge";
import { Textarea } from "@/components/ui/textarea";
import { ArrowRight, Link, Key, Save, Globe, Plus } from "lucide-react";
import { DataFlowAPI, TableRelationship, TableInfo, ColumnInfo } from "@/lib/api/dataflow";
import toast from "react-hot-toast";

// 연결 정보 타입
interface ConnectionInfo {
  fromNode: {
    id: string;
    tableName: string;
    displayName: string;
  };
  toNode: {
    id: string;
    tableName: string;
    displayName: string;
  };
  fromColumn?: string;
  toColumn?: string;
  selectedColumnsData?: {
    [tableName: string]: {
      displayName: string;
      columns: string[];
    };
  };
  existingRelationship?: {
    relationshipName: string;
    relationshipType: string;
    connectionType: string;
    settings?: any;
  };
}

// 연결 설정 타입
interface ConnectionConfig {
  relationshipName: string;
  relationshipType: "one-to-one" | "one-to-many" | "many-to-one" | "many-to-many";
  connectionType: "simple-key" | "data-save" | "external-call";
  fromColumnName: string;
  toColumnName: string;
  settings?: Record<string, unknown>;
  description?: string;
}

// 단순 키값 연결 설정
interface SimpleKeySettings {
  notes: string;
}

// 데이터 저장 설정
interface DataSaveSettings {
  sourceField: string;
  targetField: string;
  saveConditions: string;
}

// 외부 호출 설정
interface ExternalCallSettings {
  callType: "rest-api" | "email" | "webhook" | "ftp" | "queue";
  apiUrl?: string;
  httpMethod?: "GET" | "POST" | "PUT" | "DELETE";
  headers?: string;
  bodyTemplate?: string;
}

interface ConnectionSetupModalProps {
  isOpen: boolean;
  connection: ConnectionInfo | null;
  companyCode: string;
  diagramId?: number;
  onConfirm: (relationship: TableRelationship) => void;
  onCancel: () => void;
}

export const ConnectionSetupModal: React.FC<ConnectionSetupModalProps> = ({
  isOpen,
  connection,
  companyCode,
  diagramId,
  onConfirm,
  onCancel,
}) => {
  const [config, setConfig] = useState<ConnectionConfig>({
    relationshipName: "",
    relationshipType: "one-to-one",
    connectionType: "simple-key",
    fromColumnName: "",
    toColumnName: "",
    description: "",
    settings: {},
  });

  // 연결 종류별 설정 상태
  const [simpleKeySettings, setSimpleKeySettings] = useState<SimpleKeySettings>({
    notes: "",
  });

  const [dataSaveSettings, setDataSaveSettings] = useState<DataSaveSettings>({
    sourceField: "",
    targetField: "",
    saveConditions: "",
  });

  const [externalCallSettings, setExternalCallSettings] = useState<ExternalCallSettings>({
    callType: "rest-api",
    apiUrl: "",
    httpMethod: "POST",
    headers: "{}",
    bodyTemplate: "{}",
  });

  // 테이블 및 컬럼 선택을 위한 새로운 상태들
  const [availableTables, setAvailableTables] = useState<TableInfo[]>([]);
  const [selectedFromTable, setSelectedFromTable] = useState<string>("");
  const [selectedToTable, setSelectedToTable] = useState<string>("");
  const [fromTableColumns, setFromTableColumns] = useState<ColumnInfo[]>([]);
  const [toTableColumns, setToTableColumns] = useState<ColumnInfo[]>([]);
  const [selectedFromColumns, setSelectedFromColumns] = useState<string[]>([]);
  const [selectedToColumns, setSelectedToColumns] = useState<string[]>([]);

  // 테이블 목록 로드
  useEffect(() => {
    const loadTables = async () => {
      try {
        const tables = await DataFlowAPI.getTables();
        setAvailableTables(tables);
      } catch (error) {
        console.error("테이블 목록 로드 실패:", error);
        toast.error("테이블 목록을 불러오는데 실패했습니다.");
      }
    };

    if (isOpen) {
      loadTables();
    }
  }, [isOpen]);

  // 모달이 열릴 때 기본값 설정
  useEffect(() => {
    if (isOpen && connection) {
      const fromTableName = connection.fromNode.tableName;
      const toTableName = connection.toNode.tableName;
      const fromDisplayName = connection.fromNode.displayName;
      const toDisplayName = connection.toNode.displayName;

      // 테이블 선택 설정
      setSelectedFromTable(fromTableName);
      setSelectedToTable(toTableName);

      // 기존 관계 정보가 있으면 사용, 없으면 기본값 설정
      const existingRel = connection.existingRelationship;
      setConfig({
        relationshipName: existingRel?.relationshipName || `${fromDisplayName} → ${toDisplayName}`,
        relationshipType:
          (existingRel?.relationshipType as "one-to-one" | "one-to-many" | "many-to-one" | "many-to-many") ||
          "one-to-one",
        connectionType: (existingRel?.connectionType as "simple-key" | "data-save" | "external-call") || "simple-key",
        fromColumnName: "",
        toColumnName: "",
        description: existingRel?.settings?.description || `${fromDisplayName}과 ${toDisplayName} 간의 데이터 관계`,
        settings: existingRel?.settings || {},
      });

      // 단순 키값 연결 기본값 설정
      setSimpleKeySettings({
        notes: `${fromDisplayName}과 ${toDisplayName} 간의 키값 연결`,
      });

      // 데이터 저장 기본값 설정
      setDataSaveSettings({
        sourceField: "",
        targetField: "",
        saveConditions: "데이터 저장 조건을 입력하세요",
      });

      // 외부 호출 기본값 설정
      setExternalCallSettings({
        callType: "rest-api",
        apiUrl: "https://api.example.com/webhook",
        httpMethod: "POST",
        headers: "{}",
        bodyTemplate: "{}",
      });

      // 선택된 컬럼 정보가 있다면 설정
      if (connection.selectedColumnsData) {
        const fromColumns = connection.selectedColumnsData[fromTableName]?.columns || [];
        const toColumns = connection.selectedColumnsData[toTableName]?.columns || [];

        setSelectedFromColumns(fromColumns);
        setSelectedToColumns(toColumns);

        setConfig((prev) => ({
          ...prev,
          fromColumnName: fromColumns.join(", "),
          toColumnName: toColumns.join(", "),
        }));
      }
    }
  }, [isOpen, connection]);

  // From 테이블 선택 시 컬럼 로드
  useEffect(() => {
    const loadFromColumns = async () => {
      if (selectedFromTable) {
        try {
          const columns = await DataFlowAPI.getTableColumns(selectedFromTable);
          setFromTableColumns(columns);
        } catch (error) {
          console.error("From 테이블 컬럼 로드 실패:", error);
          toast.error("From 테이블 컬럼을 불러오는데 실패했습니다.");
        }
      }
    };

    loadFromColumns();
  }, [selectedFromTable]);

  // To 테이블 선택 시 컬럼 로드
  useEffect(() => {
    const loadToColumns = async () => {
      if (selectedToTable) {
        try {
          const columns = await DataFlowAPI.getTableColumns(selectedToTable);
          setToTableColumns(columns);
        } catch (error) {
          console.error("To 테이블 컬럼 로드 실패:", error);
          toast.error("To 테이블 컬럼을 불러오는데 실패했습니다.");
        }
      }
    };

    loadToColumns();
  }, [selectedToTable]);

  // 선택된 컬럼들이 변경될 때 config 업데이트
  useEffect(() => {
    setConfig((prev) => ({
      ...prev,
      fromColumnName: selectedFromColumns.join(", "),
      toColumnName: selectedToColumns.join(", "),
    }));
  }, [selectedFromColumns, selectedToColumns]);

  const handleConfirm = () => {
    if (!config.relationshipName || !connection) {
      toast.error("필수 정보를 모두 입력해주세요.");
      return;
    }

    // 연결 종류별 설정을 준비
    let settings = {};

    switch (config.connectionType) {
      case "simple-key":
        settings = simpleKeySettings;
        break;
      case "data-save":
        settings = dataSaveSettings;
        break;
      case "external-call":
        settings = externalCallSettings;
        break;
    }

    // 선택된 컬럼들 검증
    if (selectedFromColumns.length === 0 || selectedToColumns.length === 0) {
      toast.error("선택된 컬럼이 없습니다. From과 To 테이블에서 각각 최소 1개 이상의 컬럼을 선택해주세요.");
      return;
    }

    // 선택된 테이블과 컬럼 정보 사용
    const fromTableName = selectedFromTable || connection.fromNode.tableName;
    const toTableName = selectedToTable || connection.toNode.tableName;

    // 메모리 기반 시스템: 관계 데이터만 생성하여 부모로 전달
    const relationshipData: TableRelationship = {
      relationship_name: config.relationshipName,
      from_table_name: fromTableName,
      to_table_name: toTableName,
      from_column_name: selectedFromColumns.join(","), // 여러 컬럼을 콤마로 구분
      to_column_name: selectedToColumns.join(","), // 여러 컬럼을 콤마로 구분
      relationship_type: config.relationshipType as any,
      connection_type: config.connectionType as any,
      company_code: companyCode,
      settings: {
        ...settings,
        description: config.description,
        multiColumnMapping: {
          fromColumns: selectedFromColumns,
          toColumns: selectedToColumns,
          fromTable: fromTableName,
          toTable: toTableName,
        },
        isMultiColumn: selectedFromColumns.length > 1 || selectedToColumns.length > 1,
        columnCount: {
          from: selectedFromColumns.length,
          to: selectedToColumns.length,
        },
      },
    };

    toast.success("관계가 생성되었습니다!");

    // 부모 컴포넌트로 관계 데이터 전달 (DB 저장 없이)
    onConfirm(relationshipData);
    handleCancel(); // 모달 닫기
  };

  const handleCancel = () => {
    setConfig({
      relationshipName: "",
      relationshipType: "one-to-one",
      connectionType: "simple-key",
      fromColumnName: "",
      toColumnName: "",
      description: "",
    });
    onCancel();
  };

  if (!connection) return null;

  // 선택된 컬럼 데이터 가져오기
  const selectedColumnsData = connection.selectedColumnsData || {};
  const tableNames = Object.keys(selectedColumnsData);
  const fromTable = tableNames[0];
  const toTable = tableNames[1];

  const fromTableData = selectedColumnsData[fromTable];
  const toTableData = selectedColumnsData[toTable];

  // 연결 종류별 설정 패널 렌더링
  const renderConnectionTypeSettings = () => {
    switch (config.connectionType) {
      case "simple-key":
        return (
          <div className="rounded-lg border border-l-4 border-l-blue-500 bg-blue-50/30 p-4">
            <div className="mb-3 flex items-center gap-2">
              <Key className="h-4 w-4 text-blue-500" />
              <span className="text-sm font-medium">단순 키값 연결 설정</span>
            </div>
            <div className="space-y-3">
              <div>
                <Label htmlFor="notes" className="text-sm">
                  연결 설명
                </Label>
                <Textarea
                  id="notes"
                  value={simpleKeySettings.notes}
                  onChange={(e) => setSimpleKeySettings({ ...simpleKeySettings, notes: e.target.value })}
                  placeholder="데이터 연결에 대한 설명을 입력하세요"
                  rows={2}
                  className="text-sm"
                />
              </div>
            </div>
          </div>
        );

      case "data-save":
        return (
          <div className="rounded-lg border border-l-4 border-l-green-500 bg-green-50/30 p-4">
            <div className="mb-3 flex items-center gap-2">
              <Save className="h-4 w-4 text-green-500" />
              <span className="text-sm font-medium">데이터 저장 설정</span>
            </div>
            <div className="space-y-3">
              <div className="grid grid-cols-2 gap-3">
                <div>
                  <Label htmlFor="sourceField" className="text-sm">
                    소스 필드
                  </Label>
                  <Input
                    id="sourceField"
                    value={dataSaveSettings.sourceField}
                    onChange={(e) => setDataSaveSettings({ ...dataSaveSettings, sourceField: e.target.value })}
                    placeholder="소스 필드"
                    className="text-sm"
                  />
                </div>
                <div>
                  <Label htmlFor="targetField" className="text-sm">
                    대상 필드
                  </Label>
                  <div className="flex items-center gap-2">
                    <Input
                      id="targetField"
                      value={dataSaveSettings.targetField}
                      onChange={(e) => setDataSaveSettings({ ...dataSaveSettings, targetField: e.target.value })}
                      placeholder="대상 필드"
                      className="text-sm"
                    />
                    <Button size="sm" variant="outline">
                      <Plus className="h-3 w-3" />
                    </Button>
                  </div>
                </div>
              </div>
              <div>
                <Label htmlFor="saveConditions" className="text-sm">
                  저장 조건
                </Label>
                <Textarea
                  id="saveConditions"
                  value={dataSaveSettings.saveConditions}
                  onChange={(e) => setDataSaveSettings({ ...dataSaveSettings, saveConditions: e.target.value })}
                  placeholder="데이터 저장 조건을 입력하세요"
                  rows={2}
                  className="text-sm"
                />
              </div>
            </div>
          </div>
        );

      case "external-call":
        return (
          <div className="rounded-lg border border-l-4 border-l-orange-500 bg-orange-50/30 p-4">
            <div className="mb-3 flex items-center gap-2">
              <Globe className="h-4 w-4 text-orange-500" />
              <span className="text-sm font-medium">외부 호출 설정</span>
            </div>
            <div className="space-y-3">
              <div>
                <Label htmlFor="callType" className="text-sm">
                  호출 유형
                </Label>
                <Select
                  value={externalCallSettings.callType}
                  onValueChange={(value: "rest-api" | "email" | "webhook" | "ftp" | "queue") =>
                    setExternalCallSettings({ ...externalCallSettings, callType: value })
                  }
                >
                  <SelectTrigger className="text-sm">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="rest-api">REST API 호출</SelectItem>
                    <SelectItem value="email">이메일 전송</SelectItem>
                    <SelectItem value="webhook">웹훅</SelectItem>
                    <SelectItem value="ftp">FTP 업로드</SelectItem>
                    <SelectItem value="queue">메시지 큐</SelectItem>
                  </SelectContent>
                </Select>
              </div>

              {externalCallSettings.callType === "rest-api" && (
                <>
                  <div>
                    <Label htmlFor="apiUrl" className="text-sm">
                      API URL
                    </Label>
                    <Input
                      id="apiUrl"
                      value={externalCallSettings.apiUrl}
                      onChange={(e) => setExternalCallSettings({ ...externalCallSettings, apiUrl: e.target.value })}
                      placeholder="https://api.example.com/webhook"
                      className="text-sm"
                    />
                  </div>
                  <div className="grid grid-cols-2 gap-3">
                    <div>
                      <Label htmlFor="httpMethod" className="text-sm">
                        HTTP Method
                      </Label>
                      <Select
                        value={externalCallSettings.httpMethod}
                        onValueChange={(value: "GET" | "POST" | "PUT" | "DELETE") =>
                          setExternalCallSettings({ ...externalCallSettings, httpMethod: value })
                        }
                      >
                        <SelectTrigger className="text-sm">
                          <SelectValue />
                        </SelectTrigger>
                        <SelectContent>
                          <SelectItem value="GET">GET</SelectItem>
                          <SelectItem value="POST">POST</SelectItem>
                          <SelectItem value="PUT">PUT</SelectItem>
                          <SelectItem value="DELETE">DELETE</SelectItem>
                        </SelectContent>
                      </Select>
                    </div>
                    <div>
                      <Label htmlFor="headers" className="text-sm">
                        Headers
                      </Label>
                      <Textarea
                        id="headers"
                        value={externalCallSettings.headers}
                        onChange={(e) => setExternalCallSettings({ ...externalCallSettings, headers: e.target.value })}
                        placeholder="{}"
                        rows={1}
                        className="text-sm"
                      />
                    </div>
                  </div>
                  <div>
                    <Label htmlFor="bodyTemplate" className="text-sm">
                      Body Template
                    </Label>
                    <Textarea
                      id="bodyTemplate"
                      value={externalCallSettings.bodyTemplate}
                      onChange={(e) =>
                        setExternalCallSettings({ ...externalCallSettings, bodyTemplate: e.target.value })
                      }
                      placeholder="{}"
                      rows={2}
                      className="text-sm"
                    />
                  </div>
                </>
              )}
            </div>
          </div>
        );

      default:
        return null;
    }
  };

  return (
    <Dialog open={isOpen} onOpenChange={handleCancel}>
      <DialogContent className="max-h-[80vh] max-w-3xl overflow-y-auto">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2 text-lg">
            <Link className="h-4 w-4" />
            필드 연결 설정
          </DialogTitle>
        </DialogHeader>

        <div className="space-y-4">
          {/* 테이블 및 컬럼 선택 */}
          <div className="rounded-lg border bg-gray-50 p-4">
            <div className="mb-4 text-sm font-medium">테이블 및 컬럼 선택</div>

            {/* 현재 선택된 테이블 표시 */}
            <div className="mb-4 grid grid-cols-2 gap-4">
              <div>
                <Label className="text-xs font-medium text-gray-600">From 테이블</Label>
                <div className="mt-1">
                  <span className="text-sm font-medium text-gray-800">
                    {availableTables.find((t) => t.tableName === selectedFromTable)?.displayName || selectedFromTable}
                  </span>
                  <span className="ml-2 text-xs text-gray-500">({selectedFromTable})</span>
                </div>
              </div>

              <div>
                <Label className="text-xs font-medium text-gray-600">To 테이블</Label>
                <div className="mt-1">
                  <span className="text-sm font-medium text-gray-800">
                    {availableTables.find((t) => t.tableName === selectedToTable)?.displayName || selectedToTable}
                  </span>
                  <span className="ml-2 text-xs text-gray-500">({selectedToTable})</span>
                </div>
              </div>
            </div>

            {/* 컬럼 선택 */}
            <div className="grid grid-cols-2 gap-4">
              <div>
                <Label className="text-xs font-medium text-gray-600">From 컬럼</Label>
                <div className="mt-2 max-h-32 overflow-y-auto rounded border bg-white p-2">
                  {fromTableColumns.map((column) => (
                    <label key={column.columnName} className="flex items-center gap-2 py-1 text-sm">
                      <input
                        type="checkbox"
                        checked={selectedFromColumns.includes(column.columnName)}
                        onChange={(e) => {
                          if (e.target.checked) {
                            setSelectedFromColumns((prev) => [...prev, column.columnName]);
                          } else {
                            setSelectedFromColumns((prev) => prev.filter((col) => col !== column.columnName));
                          }
                        }}
                        className="rounded"
                      />
                      <span>{column.columnName}</span>
                      <span className="text-xs text-gray-500">({column.dataType})</span>
                    </label>
                  ))}
                  {fromTableColumns.length === 0 && (
                    <div className="py-2 text-xs text-gray-500">
                      {selectedFromTable ? "컬럼을 불러오는 중..." : "테이블을 먼저 선택해주세요"}
                    </div>
                  )}
                </div>
              </div>

              <div>
                <Label className="text-xs font-medium text-gray-600">To 컬럼</Label>
                <div className="mt-2 max-h-32 overflow-y-auto rounded border bg-white p-2">
                  {toTableColumns.map((column) => (
                    <label key={column.columnName} className="flex items-center gap-2 py-1 text-sm">
                      <input
                        type="checkbox"
                        checked={selectedToColumns.includes(column.columnName)}
                        onChange={(e) => {
                          if (e.target.checked) {
                            setSelectedToColumns((prev) => [...prev, column.columnName]);
                          } else {
                            setSelectedToColumns((prev) => prev.filter((col) => col !== column.columnName));
                          }
                        }}
                        className="rounded"
                      />
                      <span>{column.columnName}</span>
                      <span className="text-xs text-gray-500">({column.dataType})</span>
                    </label>
                  ))}
                  {toTableColumns.length === 0 && (
                    <div className="py-2 text-xs text-gray-500">
                      {selectedToTable ? "컬럼을 불러오는 중..." : "테이블을 먼저 선택해주세요"}
                    </div>
                  )}
                </div>
              </div>
            </div>

            {/* 선택된 컬럼 미리보기 */}
            {(selectedFromColumns.length > 0 || selectedToColumns.length > 0) && (
              <div className="mt-4 grid grid-cols-2 gap-4">
                <div>
                  <Label className="text-xs font-medium text-gray-600">선택된 From 컬럼</Label>
                  <div className="mt-1 flex flex-wrap gap-1">
                    {selectedFromColumns.length > 0 ? (
                      selectedFromColumns.map((column) => (
                        <Badge key={column} variant="outline" className="text-xs">
                          {column}
                        </Badge>
                      ))
                    ) : (
                      <span className="text-xs text-gray-400">선택된 컬럼 없음</span>
                    )}
                  </div>
                </div>

                <div>
                  <Label className="text-xs font-medium text-gray-600">선택된 To 컬럼</Label>
                  <div className="mt-1 flex flex-wrap gap-1">
                    {selectedToColumns.length > 0 ? (
                      selectedToColumns.map((column) => (
                        <Badge key={column} variant="secondary" className="text-xs">
                          {column}
                        </Badge>
                      ))
                    ) : (
                      <span className="text-xs text-gray-400">선택된 컬럼 없음</span>
                    )}
                  </div>
                </div>
              </div>
            )}
          </div>

          {/* 기본 연결 설정 */}
          <div className="grid grid-cols-2 gap-4">
            <div>
              <Label htmlFor="relationshipName">연결 이름</Label>
              <Input
                id="relationshipName"
                value={config.relationshipName}
                onChange={(e) => setConfig({ ...config, relationshipName: e.target.value })}
                placeholder="employee_id_department_id_연결"
                className="text-sm"
              />
            </div>
          </div>

          {/* 연결 종류 선택 */}
          <div>
            <Label className="text-sm font-medium">연결 종류</Label>
            <div className="mt-2 grid grid-cols-3 gap-2">
              <div
                className={`cursor-pointer rounded-lg border-2 p-3 text-center transition-colors ${
                  config.connectionType === "simple-key"
                    ? "border-blue-500 bg-blue-50"
                    : "border-gray-200 hover:border-gray-300"
                }`}
                onClick={() => setConfig({ ...config, connectionType: "simple-key" })}
              >
                <Key className="mx-auto h-6 w-6 text-blue-500" />
                <div className="mt-1 text-xs font-medium">단순 키값 연결</div>
                <div className="text-xs text-gray-600">중계 테이블 생성</div>
              </div>

              <div
                className={`cursor-pointer rounded-lg border-2 p-3 text-center transition-colors ${
                  config.connectionType === "data-save"
                    ? "border-green-500 bg-green-50"
                    : "border-gray-200 hover:border-gray-300"
                }`}
                onClick={() => setConfig({ ...config, connectionType: "data-save" })}
              >
                <Save className="mx-auto h-6 w-6 text-green-500" />
                <div className="mt-1 text-xs font-medium">데이터 저장</div>
                <div className="text-xs text-gray-600">필드 매핑 저장</div>
              </div>

              <div
                className={`cursor-pointer rounded-lg border-2 p-3 text-center transition-colors ${
                  config.connectionType === "external-call"
                    ? "border-orange-500 bg-orange-50"
                    : "border-gray-200 hover:border-gray-300"
                }`}
                onClick={() => setConfig({ ...config, connectionType: "external-call" })}
              >
                <Globe className="mx-auto h-6 w-6 text-orange-500" />
                <div className="mt-1 text-xs font-medium">외부 호출</div>
                <div className="text-xs text-gray-600">API/이메일 호출</div>
              </div>
            </div>
          </div>

          {/* 연결 종류별 상세 설정 */}
          {renderConnectionTypeSettings()}
        </div>

        <DialogFooter>
          <Button variant="outline" onClick={handleCancel}>
            취소
          </Button>
          <Button onClick={handleConfirm} disabled={!config.relationshipName}>
            연결 생성
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
};