"use client";

import { useDrag } from "react-dnd";
import {
  Type, CreditCard, Minus, Tag,
  ImageIcon, Hash, Calendar, Link2, Circle, Space, FileText,
} from "lucide-react";
import type { CardElementType } from "@/types/report";

interface CardElementItem {
  type: CardElementType;
  label: string;
  icon: React.ReactNode;
}

const CARD_ELEMENTS: CardElementItem[] = [
  { type: "header", label: "헤더", icon: <Type className="h-4 w-4" /> },
  { type: "dataCell", label: "데이터 셀", icon: <CreditCard className="h-4 w-4" /> },
  { type: "divider", label: "구분선", icon: <Minus className="h-4 w-4" /> },
  { type: "badge", label: "뱃지", icon: <Tag className="h-4 w-4" /> },
  { type: "image", label: "이미지", icon: <ImageIcon className="h-4 w-4" /> },
  { type: "number", label: "숫자/금액", icon: <Hash className="h-4 w-4" /> },
  { type: "date", label: "날짜", icon: <Calendar className="h-4 w-4" /> },
  { type: "link", label: "링크", icon: <Link2 className="h-4 w-4" /> },
  { type: "status", label: "상태", icon: <Circle className="h-4 w-4" /> },
  { type: "spacer", label: "빈 공간", icon: <Space className="h-4 w-4" /> },
  { type: "staticText", label: "고정 텍스트", icon: <FileText className="h-4 w-4" /> },
];

export const CARD_ELEMENT_DND_TYPE = "card-element";

interface DraggableElementProps {
  type: CardElementType;
  label: string;
  icon: React.ReactNode;
}

function DraggableElement({ type, label, icon }: DraggableElementProps) {
  const [{ isDragging }, drag] = useDrag(() => ({
    type: CARD_ELEMENT_DND_TYPE,
    item: { elementType: type },
    collect: (monitor) => ({
      isDragging: monitor.isDragging(),
    }),
  }));

  return (
    <div
      ref={drag as any}
      className={`flex cursor-move flex-col items-center justify-center gap-1 rounded-lg border border-gray-200 bg-gray-50 px-3 py-2 transition-colors hover:border-blue-400 hover:bg-blue-50 ${
        isDragging ? "opacity-50" : ""
      }`}
    >
      <div className="text-gray-600">{icon}</div>
      <span className="text-xs font-medium text-gray-700">{label}</span>
    </div>
  );
}

export function CardElementPalette() {
  return (
    <div className="bg-white border border-border rounded-xl p-4">
      <div className="text-sm font-bold text-gray-800 mb-3">
        요소 팔레트
        <span className="ml-2 text-xs font-normal text-muted-foreground">드래그하여 추가</span>
      </div>
      <div className="grid grid-cols-4 gap-2">
        {CARD_ELEMENTS.map((item) => (
          <DraggableElement key={item.type} {...item} />
        ))}
      </div>
    </div>
  );
}
