"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, Database, Wrench, Sparkles } from "lucide-react";
import { TableInfo, ColumnInfo } from "@/types/screen";
import TablesPanel from "./TablesPanel";

interface ComponentsPanelProps {
  className?: string;
  // 테이블 관련 props
  tables?: TableInfo[];
  searchTerm?: string;
  onSearchChange?: (value: string) => void;
  onTableDragStart?: (e: React.DragEvent, table: TableInfo, column?: ColumnInfo) => void;
  selectedTableName?: string;
  placedColumns?: Set<string>; // 이미 배치된 컬럼명 집합
}

export function ComponentsPanel({
  className,
  tables = [],
  searchTerm = "",
  onSearchChange,
  onTableDragStart,
  selectedTableName,
  placedColumns,
}: 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;
  }, []);

  // Unified 컴포넌트 정의 (새로운 통합 컴포넌트 시스템)
  // 입력 컴포넌트(unified-input, unified-select, unified-date)는 테이블 컬럼 드래그 시 자동 생성되므로 숨김
  const unifiedComponents: ComponentDefinition[] = useMemo(() => [
    // unified-input: 테이블 컬럼 드래그 시 자동 생성되므로 숨김 처리
    // unified-select: 테이블 컬럼 드래그 시 자동 생성되므로 숨김 처리
    // unified-date: 테이블 컬럼 드래그 시 자동 생성되므로 숨김 처리
    // unified-layout: 중첩 드래그앤드롭 기능 미구현으로 숨김 처리
    // unified-group: 중첩 드래그앤드롭 기능 미구현으로 숨김 처리
    {
      id: "unified-list",
      name: "통합 목록",
      description: "테이블, 카드, 칸반, 리스트 등 다양한 데이터 표시 방식 지원",
      category: "display" as ComponentCategory,
      tags: ["table", "list", "card", "kanban", "unified"],
      defaultSize: { width: 600, height: 400 },
    },
    {
      id: "unified-media",
      name: "통합 미디어",
      description: "이미지, 비디오, 오디오, 파일 업로드 등 미디어 컴포넌트",
      category: "display" as ComponentCategory,
      tags: ["image", "video", "audio", "file", "unified"],
      defaultSize: { width: 300, height: 200 },
    },
    {
      id: "unified-biz",
      name: "통합 비즈니스",
      description: "플로우 다이어그램, 랙 구조, 채번규칙 등 비즈니스 컴포넌트",
      category: "utility" as ComponentCategory,
      tags: ["flow", "rack", "numbering", "unified"],
      defaultSize: { width: 600, height: 400 },
    },
    {
      id: "unified-hierarchy",
      name: "통합 계층",
      description: "트리, 조직도, BOM, 연쇄 선택박스 등 계층 구조 컴포넌트",
      category: "data" as ComponentCategory,
      tags: ["tree", "org", "bom", "cascading", "unified"],
      defaultSize: { width: 400, height: 300 },
    },
    {
      id: "unified-repeater",
      name: "통합 반복 데이터",
      description: "반복 데이터 관리 (인라인/모달/버튼 모드)",
      category: "data" as ComponentCategory,
      tags: ["repeater", "table", "modal", "button", "unified"],
      defaultSize: { width: 600, height: 300 },
    },
  ], []);

  // 카테고리별 컴포넌트 그룹화
  const componentsByCategory = useMemo(() => {
    // 숨길 컴포넌트 ID 목록
    const hiddenComponents = [
      // 기본 입력 컴포넌트 (테이블 컬럼 드래그 시 자동 생성)
      "text-input", 
      "number-input", 
      "date-input", 
      "textarea-basic",
      // Unified 컴포넌트로 대체됨
      "image-widget",        // → UnifiedMedia (image)
      "file-upload",         // → UnifiedMedia (file)
      "entity-search-input", // → UnifiedSelect (entity 모드)
      "autocomplete-search-input", // → UnifiedSelect (autocomplete 모드)
      // UnifiedBiz로 통합 예정
      "rack-structure",      // → UnifiedBiz (rack)
      // DataFlow 전용 (일반 화면에서 불필요)
      "mail-recipient-selector",
      // 현재 사용 안함
      "repeater-field-group",
    ];

    return {
      input: allComponents.filter(
        (c) => c.category === ComponentCategory.INPUT && !hiddenComponents.includes(c.id),
      ),
      action: allComponents.filter(
        (c) => c.category === ComponentCategory.ACTION && !hiddenComponents.includes(c.id),
      ),
      display: allComponents.filter(
        (c) => c.category === ComponentCategory.DISPLAY && !hiddenComponents.includes(c.id),
      ),
      data: allComponents.filter(
        (c) => c.category === ComponentCategory.DATA && !hiddenComponents.includes(c.id),
      ),
      layout: allComponents.filter(
        (c) => c.category === ComponentCategory.LAYOUT && !hiddenComponents.includes(c.id),
      ),
      utility: allComponents.filter(
        (c) => c.category === ComponentCategory.UTILITY && !hiddenComponents.includes(c.id),
      ),
      unified: unifiedComponents,
    };
  }, [allComponents, unifiedComponents]);

  // 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 "data":
        return <Database 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>

      {/* 통합 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, 테이블, 컬럼 검색..."
            value={searchQuery}
            onChange={(e) => {
              const value = e.target.value;
              setSearchQuery(value);
              // 테이블 검색도 함께 업데이트
              if (onSearchChange) {
                onSearchChange(value);
              }
            }}
            className="h-8 pl-8 text-xs"
          />
        </div>
      </div>

      {/* 카테고리 탭 */}
      <Tabs defaultValue="unified" className="flex min-h-0 flex-1 flex-col">
        <TabsList className="mb-3 grid h-16 w-full flex-shrink-0 grid-cols-4 grid-rows-2 gap-1 p-1">
          {/* 1행: Unified, 테이블, 입력, 데이터 */}
          <TabsTrigger
            value="unified"
            className="flex items-center justify-center gap-0.5 px-0 text-[10px] bg-primary/10 data-[state=active]:bg-primary data-[state=active]:text-white"
            title="Unified 컴포넌트"
          >
            <Sparkles className="h-3 w-3" />
            <span className="text-[9px]">Unified</span>
          </TabsTrigger>
          <TabsTrigger
            value="tables"
            className="flex items-center justify-center gap-0.5 px-0 text-[10px]"
            title="테이블"
          >
            <Database className="h-3 w-3" />
            <span className="text-[9px]">테이블</span>
          </TabsTrigger>
          <TabsTrigger value="input" className="flex items-center justify-center gap-0.5 px-0 text-[10px]" title="입력">
            <Edit3 className="h-3 w-3" />
            <span className="text-[9px]">입력</span>
          </TabsTrigger>
          <TabsTrigger
            value="data"
            className="flex items-center justify-center gap-0.5 px-0 text-[10px]"
            title="데이터"
          >
            <Grid className="h-3 w-3" />
            <span className="text-[9px]">데이터</span>
          </TabsTrigger>
          {/* 2행: 액션, 표시, 레이아웃, 유틸리티 */}
          <TabsTrigger
            value="action"
            className="flex items-center justify-center gap-0.5 px-0 text-[10px]"
            title="액션"
          >
            <Zap className="h-3 w-3" />
            <span className="text-[9px]">액션</span>
          </TabsTrigger>
          <TabsTrigger
            value="display"
            className="flex items-center justify-center gap-0.5 px-0 text-[10px]"
            title="표시"
          >
            <BarChart3 className="h-3 w-3" />
            <span className="text-[9px]">표시</span>
          </TabsTrigger>
          <TabsTrigger
            value="layout"
            className="flex items-center justify-center gap-0.5 px-0 text-[10px]"
            title="레이아웃"
          >
            <Layers className="h-3 w-3" />
            <span className="text-[9px]">레이아웃</span>
          </TabsTrigger>
          <TabsTrigger
            value="utility"
            className="flex items-center justify-center gap-0.5 px-0 text-[10px]"
            title="유틸리티"
          >
            <Wrench className="h-3 w-3" />
            <span className="text-[9px]">유틸</span>
          </TabsTrigger>
        </TabsList>

        {/* Unified 컴포넌트 탭 */}
        <TabsContent value="unified" className="mt-0 flex-1 space-y-2 overflow-y-auto">
          <div className="mb-2 rounded-md bg-primary/5 border border-primary/20 p-2">
            <p className="text-[10px] text-muted-foreground leading-relaxed">
              <span className="font-semibold text-primary">Unified 컴포넌트</span>는 속성 기반으로 다양한 기능을 지원하는 새로운 컴포넌트입니다.
            </p>
          </div>
          {getFilteredComponents("unified").length > 0
            ? getFilteredComponents("unified").map(renderComponentCard)
            : renderEmptyState()}
        </TabsContent>

        {/* 테이블 탭 */}
        <TabsContent value="tables" className="mt-0 flex-1 overflow-y-auto">
          {tables.length > 0 && onTableDragStart ? (
            <TablesPanel
              tables={tables}
              searchTerm={searchTerm}
              onSearchChange={onSearchChange || (() => {})}
              onDragStart={onTableDragStart}
              selectedTableName={selectedTableName}
              placedColumns={placedColumns}
            />
          ) : (
            <div className="flex h-32 items-center justify-center text-center">
              <div className="p-6">
                <Database className="text-muted-foreground/40 mx-auto mb-2 h-10 w-10" />
                <p className="text-muted-foreground text-xs font-medium">테이블이 없습니다</p>
              </div>
            </div>
          )}
        </TabsContent>

        {/* 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>

        {/* 데이터 컴포넌트 */}
        <TabsContent value="data" className="mt-0 flex-1 space-y-2 overflow-y-auto">
          {getFilteredComponents("data").length > 0
            ? getFilteredComponents("data").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>

        {/* 유틸리티 컴포넌트 */}
        <TabsContent value="utility" className="mt-0 flex-1 space-y-2 overflow-y-auto">
          {getFilteredComponents("utility").length > 0
            ? getFilteredComponents("utility").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>
  );
}