"use client";

import React, { useState, useEffect } from "react";
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from "@/components/ui/dialog";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Badge } from "@/components/ui/badge";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { CheckCircle } from "lucide-react";
import { JsonRelationship } from "@/lib/api/dataflow";

interface SaveDiagramModalProps {
  isOpen: boolean;
  onClose: () => void;
  onSave: (diagramName: string) => Promise<{ success: boolean; error?: string }>;
  relationships: JsonRelationship[];
  defaultName?: string;
  isLoading?: boolean;
}

const SaveDiagramModal: React.FC<SaveDiagramModalProps> = ({
  isOpen,
  onClose,
  onSave,
  relationships,
  defaultName = "",
  isLoading = false,
}) => {
  const [diagramName, setDiagramName] = useState(defaultName);
  const [nameError, setNameError] = useState("");
  const [showSuccessModal, setShowSuccessModal] = useState(false);
  const [savedDiagramName, setSavedDiagramName] = useState("");

  // defaultName이 변경될 때마다 diagramName 업데이트
  useEffect(() => {
    setDiagramName(defaultName);
  }, [defaultName]);

  const handleSave = async () => {
    const trimmedName = diagramName.trim();

    if (!trimmedName) {
      setNameError("관계도 이름을 입력해주세요.");
      return;
    }

    if (trimmedName.length < 2) {
      setNameError("관계도 이름은 2글자 이상이어야 합니다.");
      return;
    }

    if (trimmedName.length > 100) {
      setNameError("관계도 이름은 100글자를 초과할 수 없습니다.");
      return;
    }

    setNameError("");

    try {
      // 부모에게 저장 요청하고 결과 받기
      const result = await onSave(trimmedName);

      if (result.success) {
        // 성공 시 성공 모달 표시
        setSavedDiagramName(trimmedName);
        setShowSuccessModal(true);
      } else {
        // 실패 시 에러 메시지 표시
        if (
          result.error?.includes("중복된 이름입니다") ||
          result.error?.includes("중복") ||
          result.error?.includes("duplicate") ||
          result.error?.includes("already exists")
        ) {
          setNameError("중복된 이름입니다.");
        } else {
          setNameError(result.error || "저장 중 오류가 발생했습니다.");
        }
      }
    } catch (error) {
      // 중복 에러가 아닌 경우만 콘솔에 로그 출력
      const isDuplicateError =
        error && typeof error === "object" && "response" in error && (error as any).response?.status === 409;

      if (!isDuplicateError) {
        console.error("저장 오류:", error);
      }

      setNameError("저장 중 오류가 발생했습니다.");
    }
  };

  const handleClose = () => {
    if (!isLoading) {
      setDiagramName(defaultName);
      setNameError("");
      onClose();
    }
  };

  const handleSuccessModalClose = () => {
    setShowSuccessModal(false);
    setSavedDiagramName("");
    handleClose(); // 원래 모달도 닫기
  };

  const handleKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === "Enter" && !isLoading) {
      handleSave();
    }
  };

  // 관련된 테이블 목록 추출
  const connectedTables = Array.from(
    new Set([...relationships.map((rel) => rel.fromTable), ...relationships.map((rel) => rel.toTable)]),
  ).sort();

  return (
    <>
      <Dialog open={isOpen} onOpenChange={handleClose}>
        <DialogContent className="max-h-[80vh] max-w-2xl overflow-y-auto">
          <DialogHeader>
            <DialogTitle className="text-lg font-semibold">📊 관계도 저장</DialogTitle>
          </DialogHeader>

          <div className="space-y-6">
            {/* 관계도 이름 입력 */}
            <div className="space-y-2">
              <Label htmlFor="diagram-name" className="text-sm font-medium">
                관계도 이름 *
              </Label>
              <Input
                id="diagram-name"
                value={diagramName}
                onChange={(e) => {
                  setDiagramName(e.target.value);
                  if (nameError) setNameError("");
                }}
                onKeyPress={handleKeyPress}
                placeholder="예: 사용자-부서 관계도"
                disabled={isLoading}
                className={nameError ? "border-destructive focus:border-destructive" : ""}
              />
              {nameError && <p className="text-sm text-destructive">{nameError}</p>}
            </div>

            {/* 관계 요약 정보 */}
            <div className="grid grid-cols-3 gap-4 rounded-lg bg-gray-50 p-4">
              <div className="text-center">
                <div className="text-2xl font-bold text-primary">{relationships.length}</div>
                <div className="text-sm text-muted-foreground">관계 수</div>
              </div>
              <div className="text-center">
                <div className="text-2xl font-bold text-green-600">{connectedTables.length}</div>
                <div className="text-sm text-muted-foreground">연결된 테이블</div>
              </div>
              <div className="text-center">
                <div className="text-2xl font-bold text-purple-600">
                  {relationships.reduce((sum, rel) => sum + rel.fromColumns.length, 0)}
                </div>
                <div className="text-sm text-muted-foreground">연결된 컬럼</div>
              </div>
            </div>

            {/* 연결된 테이블 목록 */}
            {connectedTables.length > 0 && (
              <Card>
                <CardHeader>
                  <CardTitle className="text-sm">연결된 테이블</CardTitle>
                </CardHeader>
                <CardContent>
                  <div className="flex flex-wrap gap-2">
                    {connectedTables.map((table) => (
                      <Badge key={table} variant="outline" className="text-xs">
                        {table}
                      </Badge>
                    ))}
                  </div>
                </CardContent>
              </Card>
            )}

            {/* 관계 목록 미리보기 */}
            {relationships.length > 0 && (
              <Card>
                <CardHeader>
                  <CardTitle className="text-sm">관계 목록</CardTitle>
                </CardHeader>
                <CardContent>
                  <div className="max-h-60 space-y-3 overflow-y-auto">
                    {relationships.map((relationship, index) => (
                      <div
                        key={relationship.id || index}
                        className="flex items-center justify-between rounded-lg border bg-white p-3 hover:bg-gray-50"
                      >
                        <div className="flex-1">
                          <div className="flex items-center gap-2 text-sm">
                            <Badge variant="secondary" className="text-xs">
                              {relationship.connectionType || "simple-key"}
                            </Badge>
                            <span className="font-medium">
                              {relationship.relationshipName || `${relationship.fromTable} → ${relationship.toTable}`}
                            </span>
                          </div>
                          <div className="mt-1 text-xs text-muted-foreground">
                            {relationship.fromTable} → {relationship.toTable}
                          </div>
                        </div>
                        <Badge variant="outline" className="text-xs">
                          {relationship.connectionType}
                        </Badge>
                      </div>
                    ))}
                  </div>
                </CardContent>
              </Card>
            )}

            {/* 관계가 없는 경우 안내 */}
            {relationships.length === 0 && (
              <div className="py-8 text-center text-gray-500">
                <div className="mb-2 text-4xl">📭</div>
                <div className="text-sm">생성된 관계가 없습니다.</div>
                <div className="mt-1 text-xs text-gray-400">테이블을 추가하고 컬럼을 연결해서 관계를 생성해보세요.</div>
              </div>
            )}
          </div>

          <DialogFooter className="flex gap-2">
            <Button variant="outline" onClick={handleClose} disabled={isLoading}>
              취소
            </Button>
            <Button
              onClick={handleSave}
              disabled={isLoading || relationships.length === 0}
              className="bg-blue-600 hover:bg-blue-700"
            >
              {isLoading ? (
                <div className="flex items-center gap-2">
                  <div className="h-4 w-4 animate-spin rounded-full border-2 border-white border-t-transparent"></div>
                  저장 중...
                </div>
              ) : (
                "저장하기"
              )}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>

      {/* 저장 성공 알림 모달 */}
      <AlertDialog open={showSuccessModal} onOpenChange={setShowSuccessModal}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle className="flex items-center gap-2">
              <CheckCircle className="h-5 w-5 text-green-500" />
              관계도 저장 완료
            </AlertDialogTitle>
            <AlertDialogDescription className="text-base">
              <span className="font-medium text-green-600">{savedDiagramName}</span> 관계도가 성공적으로 저장되었습니다.
              <br />
              <span className="mt-2 block text-sm text-gray-500">
                저장된 관계도는 관리 메뉴에서 확인하고 수정할 수 있습니다.
              </span>
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogAction onClick={handleSuccessModalClose}>확인</AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </>
  );
};

export default SaveDiagramModal;