"use client";

import React, { useState, useMemo } from "react";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { ComponentRegistry } from "@/lib/registry/ComponentRegistry";
import { ComponentDefinition, ComponentCategory } from "@/types/component";
import { Search, Package, Grid, Layers, Palette, Zap, MousePointer, Edit3, BarChart3 } from "lucide-react";

interface ComponentsPanelProps {
  className?: string;
}

export function ComponentsPanel({ className }: ComponentsPanelProps) {
  const [searchQuery, setSearchQuery] = useState("");

  // 레지스트리에서 모든 컴포넌트 조회
  const allComponents = useMemo(() => {
    const components = ComponentRegistry.getAllComponents();

    // 수동으로 table-list 컴포넌트 추가 (임시)
    const hasTableList = components.some((c) => c.id === "table-list");
    if (!hasTableList) {
      components.push({
        id: "table-list",
        name: "데이터 테이블 v2",
        description: "검색, 필터링, 페이징, CRUD 기능이 포함된 완전한 데이터 테이블 컴포넌트",
        category: "display",
        tags: ["table", "data", "crud"],
        defaultSize: { width: 1000, height: 680 },
      } as ComponentDefinition);
    }

    return components;
  }, []);

  // 카테고리별 컴포넌트 그룹화
  const componentsByCategory = useMemo(() => {
    // 숨길 컴포넌트 ID 목록 (기본 입력 컴포넌트들)
    const hiddenInputComponents = ["text-input", "number-input", "date-input", "textarea-basic"];

    return {
      input: allComponents.filter(
        (c) => c.category === ComponentCategory.INPUT && !hiddenInputComponents.includes(c.id),
      ),
      action: allComponents.filter((c) => c.category === ComponentCategory.ACTION),
      display: allComponents.filter((c) => c.category === ComponentCategory.DISPLAY),
      layout: allComponents.filter((c) => c.category === ComponentCategory.LAYOUT),
    };
  }, [allComponents]);

  // 카테고리별 검색 필터링
  const getFilteredComponents = (category: keyof typeof componentsByCategory) => {
    let components = componentsByCategory[category];

    if (searchQuery) {
      const query = searchQuery.toLowerCase();
      components = components.filter(
        (component: ComponentDefinition) =>
          component.name.toLowerCase().includes(query) ||
          component.description.toLowerCase().includes(query) ||
          component.tags?.some((tag: string) => tag.toLowerCase().includes(query)),
      );
    }

    return components;
  };

  // 카테고리 아이콘 매핑
  const getCategoryIcon = (category: ComponentCategory) => {
    switch (category) {
      case "display":
        return <Palette className="h-6 w-6" />;
      case "action":
        return <Zap className="h-6 w-6" />;
      case "layout":
        return <Layers className="h-6 w-6" />;
      case "utility":
        return <Package className="h-6 w-6" />;
      default:
        return <Grid className="h-6 w-6" />;
    }
  };

  // 드래그 시작 핸들러
  const handleDragStart = (e: React.DragEvent<HTMLDivElement>, component: ComponentDefinition) => {
    const dragData = {
      type: "component",
      component: component,
    };
    e.dataTransfer.setData("application/json", JSON.stringify(dragData));
    e.dataTransfer.effectAllowed = "copy";
  };

  // 컴포넌트 카드 렌더링 함수
  const renderComponentCard = (component: ComponentDefinition) => (
    <div
      key={component.id}
      draggable
      onDragStart={(e) => {
        handleDragStart(e, component);
        e.currentTarget.style.opacity = "0.6";
        e.currentTarget.style.transform = "rotate(2deg) scale(0.98)";
      }}
      onDragEnd={(e) => {
        e.currentTarget.style.opacity = "1";
        e.currentTarget.style.transform = "none";
      }}
      className="group bg-card hover:border-primary/50 cursor-grab rounded-lg border p-3 shadow-sm transition-all duration-200 hover:-translate-y-0.5 hover:shadow-md active:translate-y-0 active:scale-[0.98] active:cursor-grabbing"
    >
      <div className="flex items-start gap-3">
        <div className="bg-primary/10 text-primary group-hover:bg-primary/20 flex h-10 w-10 items-center justify-center rounded-md transition-all duration-200">
          {getCategoryIcon(component.category)}
        </div>
        <div className="min-w-0 flex-1">
          <h4 className="mb-1 text-xs leading-tight font-semibold">{component.name}</h4>
          <p className="text-muted-foreground mb-1.5 line-clamp-2 text-xs leading-relaxed">{component.description}</p>
          <div className="flex items-center">
            <span className="bg-muted text-muted-foreground rounded-full px-2 py-0.5 text-xs font-medium">
              {component.defaultSize.width}×{component.defaultSize.height}
            </span>
          </div>
        </div>
      </div>
    </div>
  );

  // 빈 상태 렌더링
  const renderEmptyState = () => (
    <div className="flex h-32 items-center justify-center text-center">
      <div className="p-6">
        <Package className="text-muted-foreground/40 mx-auto mb-2 h-10 w-10" />
        <p className="text-muted-foreground text-xs font-medium">컴포넌트를 찾을 수 없습니다</p>
        <p className="text-muted-foreground/60 mt-1 text-xs">검색어를 조정해보세요</p>
      </div>
    </div>
  );

  return (
    <div className={`bg-background flex h-full flex-col p-4 ${className}`}>
      {/* 헤더 */}
      <div className="mb-3">
        <h2 className="mb-0.5 text-sm font-semibold">컴포넌트</h2>
        <p className="text-muted-foreground text-xs">{allComponents.length}개 사용 가능</p>
      </div>

      {/* 검색 */}
      <div className="mb-3">
        <div className="relative">
          <Search className="text-muted-foreground absolute top-1/2 left-2.5 h-3.5 w-3.5 -translate-y-1/2" />
          <Input
            placeholder="컴포넌트 검색..."
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            className="h-8 pl-8 text-xs"
          />
        </div>
      </div>

      {/* 카테고리 탭 */}
      <Tabs defaultValue="input" className="flex flex-1 flex-col">
        <TabsList className="mb-3 grid h-8 w-full grid-cols-4">
          <TabsTrigger value="input" className="flex items-center gap-1 px-1 text-xs">
            <Edit3 className="h-3 w-3" />
            <span className="hidden sm:inline">입력</span>
          </TabsTrigger>
          <TabsTrigger value="action" className="flex items-center gap-1 px-1 text-xs">
            <Zap className="h-3 w-3" />
            <span className="hidden sm:inline">액션</span>
          </TabsTrigger>
          <TabsTrigger value="display" className="flex items-center gap-1 px-1 text-xs">
            <BarChart3 className="h-3 w-3" />
            <span className="hidden sm:inline">표시</span>
          </TabsTrigger>
          <TabsTrigger value="layout" className="flex items-center gap-1 px-1 text-xs">
            <Layers className="h-3 w-3" />
            <span className="hidden sm:inline">레이아웃</span>
          </TabsTrigger>
        </TabsList>

        {/* 입력 컴포넌트 */}
        <TabsContent value="input" className="mt-0 flex-1 space-y-2 overflow-y-auto">
          {getFilteredComponents("input").length > 0
            ? getFilteredComponents("input").map(renderComponentCard)
            : renderEmptyState()}
        </TabsContent>

        {/* 액션 컴포넌트 */}
        <TabsContent value="action" className="mt-0 flex-1 space-y-2 overflow-y-auto">
          {getFilteredComponents("action").length > 0
            ? getFilteredComponents("action").map(renderComponentCard)
            : renderEmptyState()}
        </TabsContent>

        {/* 표시 컴포넌트 */}
        <TabsContent value="display" className="mt-0 flex-1 space-y-2 overflow-y-auto">
          {getFilteredComponents("display").length > 0
            ? getFilteredComponents("display").map(renderComponentCard)
            : renderEmptyState()}
        </TabsContent>

        {/* 레이아웃 컴포넌트 */}
        <TabsContent value="layout" className="mt-0 flex-1 space-y-2 overflow-y-auto">
          {getFilteredComponents("layout").length > 0
            ? getFilteredComponents("layout").map(renderComponentCard)
            : renderEmptyState()}
        </TabsContent>
      </Tabs>

      {/* 도움말 */}
      <div className="border-primary/20 bg-primary/5 mt-3 rounded-lg border p-3">
        <div className="flex items-start gap-2">
          <MousePointer className="text-primary mt-0.5 h-3.5 w-3.5 flex-shrink-0" />
          <p className="text-muted-foreground text-xs leading-relaxed">
            컴포넌트를 <span className="text-foreground font-semibold">드래그</span>하여 화면에 추가하세요
          </p>
        </div>
      </div>
    </div>
  );
}