"use client";

import React, { useState, useEffect } from "react";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
  DialogFooter,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Switch } from "@/components/ui/switch";
import { Input } from "@/components/ui/input";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { GripVertical, Eye, EyeOff } from "lucide-react";

interface ColumnConfig {
  columnName: string;
  label: string;
  visible: boolean;
  width?: number;
  frozen?: boolean;
}

interface TableOptionsModalProps {
  isOpen: boolean;
  onClose: () => void;
  columns: ColumnConfig[];
  onSave: (config: {
    columns: ColumnConfig[];
    showGridLines: boolean;
    viewMode: "table" | "card" | "grouped-card";
  }) => void;
  tableName: string;
  userId?: string;
}

export function TableOptionsModal({
  isOpen,
  onClose,
  columns: initialColumns,
  onSave,
  tableName,
  userId = "guest",
}: TableOptionsModalProps) {
  const [columns, setColumns] = useState<ColumnConfig[]>(initialColumns);
  const [showGridLines, setShowGridLines] = useState(true);
  const [viewMode, setViewMode] = useState<"table" | "card" | "grouped-card">("table");
  const [draggedIndex, setDraggedIndex] = useState<number | null>(null);
  const [dragOverIndex, setDragOverIndex] = useState<number | null>(null);

  // localStorage에서 설정 불러오기
  useEffect(() => {
    if (isOpen) {
      const storageKey = `table_options_${tableName}_${userId}`;
      const savedConfig = localStorage.getItem(storageKey);
      
      if (savedConfig) {
        try {
          const parsed = JSON.parse(savedConfig);
          setColumns(parsed.columns || initialColumns);
          setShowGridLines(parsed.showGridLines ?? true);
          setViewMode(parsed.viewMode || "table");
        } catch (error) {
          console.error("설정 불러오기 실패:", error);
        }
      } else {
        setColumns(initialColumns);
      }
    }
  }, [isOpen, tableName, userId, initialColumns]);

  // 컬럼 표시/숨기기 토글
  const toggleColumnVisibility = (index: number) => {
    const newColumns = [...columns];
    newColumns[index].visible = !newColumns[index].visible;
    setColumns(newColumns);
  };

  // 컬럼 틀고정 토글
  const toggleColumnFrozen = (index: number) => {
    const newColumns = [...columns];
    newColumns[index].frozen = !newColumns[index].frozen;
    setColumns(newColumns);
  };

  // 컬럼 너비 변경
  const updateColumnWidth = (index: number, width: number) => {
    const newColumns = [...columns];
    newColumns[index].width = width;
    setColumns(newColumns);
  };

  // 드래그 앤 드롭 핸들러
  const handleDragStart = (index: number) => {
    setDraggedIndex(index);
  };

  const handleDragOver = (e: React.DragEvent, index: number) => {
    e.preventDefault();
    setDragOverIndex(index);
  };

  const handleDrop = (e: React.DragEvent, dropIndex: number) => {
    e.preventDefault();
    
    if (draggedIndex === null || draggedIndex === dropIndex) {
      setDraggedIndex(null);
      setDragOverIndex(null);
      return;
    }

    const newColumns = [...columns];
    const [draggedColumn] = newColumns.splice(draggedIndex, 1);
    newColumns.splice(dropIndex, 0, draggedColumn);
    
    setColumns(newColumns);
    setDraggedIndex(null);
    setDragOverIndex(null);
  };

  const handleDragEnd = () => {
    setDraggedIndex(null);
    setDragOverIndex(null);
  };

  // 저장
  const handleSave = () => {
    const config = {
      columns,
      showGridLines,
      viewMode,
    };

    // localStorage에 저장
    const storageKey = `table_options_${tableName}_${userId}`;
    localStorage.setItem(storageKey, JSON.stringify(config));

    onSave(config);
    onClose();
  };

  // 초기화
  const handleReset = () => {
    setColumns(initialColumns);
    setShowGridLines(true);
    setViewMode("table");
  };

  return (
    <Dialog open={isOpen} onOpenChange={onClose}>
      <DialogContent className="max-h-[90vh] sm:max-w-[700px]">
        <DialogHeader>
          <DialogTitle className="text-base sm:text-lg">테이블 옵션</DialogTitle>
          <DialogDescription className="text-xs sm:text-sm">
            컬럼 표시/숨기기, 순서 변경, 틀고정 등을 설정할 수 있습니다.
          </DialogDescription>
        </DialogHeader>

        <Tabs defaultValue="columns" className="flex flex-col flex-1 overflow-hidden">
          <TabsList className="grid w-full grid-cols-3 flex-shrink-0">
            <TabsTrigger value="columns" className="text-xs sm:text-sm">컬럼 설정</TabsTrigger>
            <TabsTrigger value="display" className="text-xs sm:text-sm">표시 설정</TabsTrigger>
            <TabsTrigger value="view" className="text-xs sm:text-sm">보기 모드</TabsTrigger>
          </TabsList>

          {/* 컬럼 설정 탭 */}
          <TabsContent value="columns" className="flex-1 overflow-y-auto space-y-3 sm:space-y-4 mt-4">
            <div className="text-xs sm:text-sm text-muted-foreground mb-2">
              드래그하여 순서를 변경하거나, 아이콘을 클릭하여 표시/숨기기를 설정하세요.
            </div>
            
            <div className="space-y-2">
              {columns.map((column, index) => (
                <div
                  key={column.columnName}
                  draggable
                  onDragStart={() => handleDragStart(index)}
                  onDragOver={(e) => handleDragOver(e, index)}
                  onDrop={(e) => handleDrop(e, index)}
                  onDragEnd={handleDragEnd}
                  className={`flex items-center gap-2 p-2 sm:p-3 border rounded-md bg-card hover:bg-accent/50 transition-colors cursor-move ${
                    dragOverIndex === index ? "border-primary" : "border-border"
                  }`}
                >
                  {/* 드래그 핸들 */}
                  <GripVertical className="h-4 w-4 text-muted-foreground flex-shrink-0" />

                  {/* 컬럼명 */}
                  <div className="flex-1 min-w-0">
                    <div className="text-xs sm:text-sm font-medium truncate">
                      {column.label}
                    </div>
                    <div className="text-[10px] sm:text-xs text-muted-foreground truncate">
                      {column.columnName}
                    </div>
                  </div>

                  {/* 너비 설정 */}
                  <div className="flex items-center gap-1 sm:gap-2">
                    <Label className="text-[10px] sm:text-xs whitespace-nowrap">너비:</Label>
                    <Input
                      type="number"
                      value={column.width || 150}
                      onChange={(e) => updateColumnWidth(index, parseInt(e.target.value) || 150)}
                      className="h-7 w-16 sm:h-8 sm:w-20 text-xs"
                      min={50}
                      max={500}
                    />
                  </div>

                  {/* 틀고정 */}
                  <Button
                    variant={column.frozen ? "default" : "outline"}
                    size="sm"
                    onClick={() => toggleColumnFrozen(index)}
                    className="h-7 px-2 text-[10px] sm:h-8 sm:px-3 sm:text-xs"
                  >
                    {column.frozen ? "고정됨" : "고정"}
                  </Button>

                  {/* 표시/숨기기 */}
                  <Button
                    variant="ghost"
                    size="icon"
                    onClick={() => toggleColumnVisibility(index)}
                    className="h-7 w-7 sm:h-8 sm:w-8 flex-shrink-0"
                  >
                    {column.visible ? (
                      <Eye className="h-4 w-4 text-primary" />
                    ) : (
                      <EyeOff className="h-4 w-4 text-muted-foreground" />
                    )}
                  </Button>
                </div>
              ))}
            </div>
          </TabsContent>

          {/* 표시 설정 탭 */}
          <TabsContent value="display" className="flex-1 overflow-y-auto space-y-3 sm:space-y-4 mt-4">
            <div className="flex items-center justify-between p-3 sm:p-4 border rounded-md bg-card">
              <div className="space-y-0.5">
                <Label className="text-xs sm:text-sm font-medium">그리드선 표시</Label>
                <p className="text-[10px] sm:text-xs text-muted-foreground">
                  테이블의 셀 구분선을 표시합니다
                </p>
              </div>
              <Switch
                checked={showGridLines}
                onCheckedChange={setShowGridLines}
              />
            </div>
          </TabsContent>

          {/* 보기 모드 탭 */}
          <TabsContent value="view" className="flex-1 overflow-y-auto space-y-3 sm:space-y-4 mt-4">
            <div className="grid gap-3">
              <Button
                variant={viewMode === "table" ? "default" : "outline"}
                onClick={() => setViewMode("table")}
                className="h-auto flex-col items-start p-3 sm:p-4 text-left"
              >
                <div className="text-sm sm:text-base font-semibold">테이블형</div>
                <div className="text-xs text-muted-foreground mt-1">
                  전통적인 행/열 테이블 형식으로 표시
                </div>
              </Button>

              <Button
                variant={viewMode === "card" ? "default" : "outline"}
                onClick={() => setViewMode("card")}
                className="h-auto flex-col items-start p-3 sm:p-4 text-left"
              >
                <div className="text-sm sm:text-base font-semibold">카드형</div>
                <div className="text-xs text-muted-foreground mt-1">
                  각 항목을 카드로 표시 (가로로 길게)
                </div>
              </Button>

              <Button
                variant={viewMode === "grouped-card" ? "default" : "outline"}
                onClick={() => setViewMode("grouped-card")}
                className="h-auto flex-col items-start p-3 sm:p-4 text-left"
              >
                <div className="text-sm sm:text-base font-semibold">그룹화된 카드형</div>
                <div className="text-xs text-muted-foreground mt-1">
                  그룹별로 카드를 묶어서 표시
                </div>
              </Button>
            </div>
          </TabsContent>
        </Tabs>

        <DialogFooter className="gap-2 sm:gap-0 mt-4">
          <Button
            variant="outline"
            onClick={handleReset}
            className="h-8 flex-1 text-xs sm:h-10 sm:flex-none sm:text-sm"
          >
            초기화
          </Button>
          <Button
            variant="outline"
            onClick={onClose}
            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"
          >
            저장
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}