"use client";

import React from "react";
import { Handle, Position } from "@xyflow/react";
import {
  Monitor,
  Database,
  FormInput,
  Table2,
  LayoutDashboard,
  MousePointer2,
  Key,
  Link2,
  Columns3,
} from "lucide-react";
import { ScreenLayoutSummary } from "@/lib/api/screenGroup";

// ========== 타입 정의 ==========

// 화면 노드 데이터 인터페이스
export interface ScreenNodeData {
  label: string;
  subLabel?: string;
  type: "screen" | "table" | "action";
  tableName?: string;
  isMain?: boolean;
  // 레이아웃 요약 정보 (미리보기용)
  layoutSummary?: ScreenLayoutSummary;
}

// 테이블 노드 데이터 인터페이스
export interface TableNodeData {
  label: string;
  subLabel?: string;
  isMain?: boolean;
  columns?: Array<{
    name: string;
    type: string;
    isPrimaryKey?: boolean;
    isForeignKey?: boolean;
  }>;
}

// ========== 유틸리티 함수 ==========

// 화면 타입별 아이콘
const getScreenTypeIcon = (screenType?: string) => {
  switch (screenType) {
    case "grid":
      return <Table2 className="h-4 w-4" />;
    case "dashboard":
      return <LayoutDashboard className="h-4 w-4" />;
    case "action":
      return <MousePointer2 className="h-4 w-4" />;
    default:
      return <FormInput className="h-4 w-4" />;
  }
};

// 화면 타입별 색상 (헤더)
const getScreenTypeColor = (screenType?: string, isMain?: boolean) => {
  if (!isMain) return "bg-slate-400";
  switch (screenType) {
    case "grid":
      return "bg-violet-500";
    case "dashboard":
      return "bg-amber-500";
    case "action":
      return "bg-rose-500";
    default:
      return "bg-blue-500";
  }
};

// 화면 타입별 라벨
const getScreenTypeLabel = (screenType?: string) => {
  switch (screenType) {
    case "grid":
      return "그리드";
    case "dashboard":
      return "대시보드";
    case "action":
      return "액션";
    default:
      return "폼";
  }
};

// ========== 화면 노드 (상단) - 미리보기 표시 ==========
export const ScreenNode: React.FC<{ data: ScreenNodeData }> = ({ data }) => {
  const { label, subLabel, isMain, tableName, layoutSummary } = data;
  const screenType = layoutSummary?.screenType || "form";
  const headerColor = getScreenTypeColor(screenType, isMain);

  return (
    <div className="group relative flex h-[320px] w-[260px] flex-col overflow-hidden rounded-lg border border-border bg-card shadow-md transition-all hover:shadow-lg hover:ring-2 hover:ring-primary/20">
      {/* Handles */}
      <Handle
        type="target"
        position={Position.Left}
        id="left"
        className="!h-2 !w-2 !border-2 !border-background !bg-blue-500 opacity-0 transition-opacity group-hover:opacity-100"
      />
      <Handle
        type="source"
        position={Position.Right}
        id="right"
        className="!h-2 !w-2 !border-2 !border-background !bg-blue-500 opacity-0 transition-opacity group-hover:opacity-100"
      />
      <Handle
        type="source"
        position={Position.Bottom}
        id="bottom"
        className="!h-2 !w-2 !border-2 !border-background !bg-blue-500 opacity-0 transition-opacity group-hover:opacity-100"
      />

      {/* 헤더 (컬러) */}
      <div className={`flex items-center gap-2 px-3 py-2 text-white ${headerColor}`}>
        <Monitor className="h-4 w-4" />
        <span className="flex-1 truncate text-xs font-semibold">{label}</span>
        {isMain && <span className="flex h-2 w-2 rounded-full bg-white/80" />}
      </div>

      {/* 화면 미리보기 영역 (컴팩트) */}
      <div className="h-[140px] overflow-hidden bg-slate-50 p-2">
        {layoutSummary ? (
          <ScreenPreview layoutSummary={layoutSummary} screenType={screenType} />
        ) : (
          <div className="flex h-full flex-col items-center justify-center text-muted-foreground">
            {getScreenTypeIcon(screenType)}
            <span className="mt-1 text-[10px]">화면: {label}</span>
          </div>
        )}
      </div>

      {/* 필드 매핑 영역 */}
      <div className="flex-1 overflow-hidden border-t border-slate-200 bg-white px-2 py-1.5">
        <div className="mb-1 flex items-center gap-1 text-[9px] font-medium text-slate-500">
          <Columns3 className="h-3 w-3" />
          <span>필드 매핑</span>
          <span className="ml-auto text-[8px] text-slate-400">
            {layoutSummary?.layoutItems?.filter(i => i.label && !i.componentKind?.includes('button')).length || 0}개
          </span>
        </div>
        <div className="flex flex-col gap-0.5 overflow-y-auto" style={{ maxHeight: '80px' }}>
          {layoutSummary?.layoutItems
            ?.filter(item => item.label && !item.componentKind?.includes('button'))
            ?.slice(0, 6)
            ?.map((item, idx) => (
              <div key={idx} className="flex items-center gap-1 rounded bg-slate-50 px-1.5 py-0.5">
                <div className={`h-1.5 w-1.5 rounded-full ${
                  item.componentKind === 'table-list' ? 'bg-violet-400' :
                  item.componentKind?.includes('select') ? 'bg-amber-400' :
                  'bg-slate-400'
                }`} />
                <span className="flex-1 truncate text-[9px] text-slate-600">{item.label}</span>
                <span className="text-[8px] text-slate-400">{item.componentKind?.split('-')[0] || 'field'}</span>
              </div>
            )) || (
              <div className="text-center text-[9px] text-slate-400 py-2">필드 정보 없음</div>
            )}
        </div>
      </div>

      {/* 푸터 (테이블 정보) */}
      <div className="flex items-center justify-between border-t border-border bg-muted/30 px-3 py-1.5">
        <div className="flex items-center gap-1 text-[10px] text-muted-foreground">
          <Database className="h-3 w-3" />
          <span className="max-w-[120px] truncate font-mono">{tableName || "No Table"}</span>
        </div>
        <span className="rounded bg-muted px-1.5 py-0.5 text-[9px] font-medium text-muted-foreground">
          {getScreenTypeLabel(screenType)}
        </span>
      </div>
    </div>
  );
};

// ========== 컴포넌트 종류별 미니어처 색상 ==========
// componentKind는 더 정확한 컴포넌트 타입 (table-list, button-primary 등)
const getComponentColor = (componentKind: string) => {
  // 테이블/그리드 관련
  if (componentKind === "table-list" || componentKind === "data-grid") {
    return "bg-violet-200 border-violet-400";
  }
  // 검색 필터
  if (componentKind === "table-search-widget" || componentKind === "search-filter") {
    return "bg-pink-200 border-pink-400";
  }
  // 버튼 관련
  if (componentKind?.includes("button")) {
    return "bg-blue-300 border-blue-500";
  }
  // 입력 필드
  if (componentKind?.includes("input") || componentKind?.includes("text")) {
    return "bg-slate-200 border-slate-400";
  }
  // 셀렉트/드롭다운
  if (componentKind?.includes("select") || componentKind?.includes("dropdown")) {
    return "bg-amber-200 border-amber-400";
  }
  // 차트
  if (componentKind?.includes("chart")) {
    return "bg-emerald-200 border-emerald-400";
  }
  // 커스텀 위젯
  if (componentKind === "custom") {
    return "bg-pink-200 border-pink-400";
  }
  return "bg-slate-100 border-slate-300";
};

// ========== 화면 미리보기 컴포넌트 - 화면 타입별 간단한 일러스트 ==========
const ScreenPreview: React.FC<{ layoutSummary: ScreenLayoutSummary; screenType: string }> = ({
  layoutSummary,
  screenType,
}) => {
  const { totalComponents, widgetCounts } = layoutSummary;

  // 그리드 화면 일러스트
  if (screenType === "grid") {
    return (
      <div className="flex h-full flex-col gap-2 rounded-lg border border-slate-200 bg-gradient-to-b from-slate-50 to-white p-3">
        {/* 상단 툴바 */}
        <div className="flex items-center gap-2">
          <div className="h-4 w-16 rounded bg-pink-400/80 shadow-sm" />
          <div className="flex-1" />
          <div className="h-4 w-8 rounded bg-blue-500 shadow-sm" />
          <div className="h-4 w-8 rounded bg-blue-500 shadow-sm" />
          <div className="h-4 w-8 rounded bg-rose-500 shadow-sm" />
        </div>
        {/* 테이블 헤더 */}
        <div className="flex gap-1 rounded-t-md bg-violet-500 px-2 py-2 shadow-sm">
          {[...Array(5)].map((_, i) => (
            <div key={i} className="h-2.5 flex-1 rounded bg-white/40" />
          ))}
        </div>
        {/* 테이블 행들 */}
        <div className="flex flex-1 flex-col gap-1 overflow-hidden">
          {[...Array(7)].map((_, i) => (
            <div key={i} className={`flex gap-1 rounded px-2 py-1.5 ${i % 2 === 0 ? "bg-slate-100" : "bg-white"}`}>
              {[...Array(5)].map((_, j) => (
                <div key={j} className="h-2 flex-1 rounded bg-slate-300/70" />
              ))}
            </div>
          ))}
        </div>
        {/* 페이지네이션 */}
        <div className="flex items-center justify-center gap-2 pt-1">
          <div className="h-2.5 w-4 rounded bg-slate-300" />
          <div className="h-2.5 w-4 rounded bg-blue-500" />
          <div className="h-2.5 w-4 rounded bg-slate-300" />
          <div className="h-2.5 w-4 rounded bg-slate-300" />
        </div>
        {/* 컴포넌트 수 */}
        <div className="absolute bottom-2 right-2 rounded-md bg-slate-800/80 px-2 py-1 text-[10px] font-medium text-white shadow-sm">
          {totalComponents}개
        </div>
      </div>
    );
  }

  // 폼 화면 일러스트
  if (screenType === "form") {
    return (
      <div className="flex h-full flex-col gap-3 rounded-lg border border-slate-200 bg-gradient-to-b from-slate-50 to-white p-3">
        {/* 폼 필드들 */}
        {[...Array(6)].map((_, i) => (
          <div key={i} className="flex items-center gap-3">
            <div className="h-2.5 w-14 rounded bg-slate-400" />
            <div className="h-5 flex-1 rounded-md border border-slate-300 bg-white shadow-sm" />
          </div>
        ))}
        {/* 버튼 영역 */}
        <div className="mt-auto flex justify-end gap-2 border-t border-slate-100 pt-3">
          <div className="h-5 w-14 rounded-md bg-slate-300 shadow-sm" />
          <div className="h-5 w-14 rounded-md bg-blue-500 shadow-sm" />
        </div>
        {/* 컴포넌트 수 */}
        <div className="absolute bottom-2 right-2 rounded-md bg-slate-800/80 px-2 py-1 text-[10px] font-medium text-white shadow-sm">
          {totalComponents}개
        </div>
      </div>
    );
  }

  // 대시보드 화면 일러스트
  if (screenType === "dashboard") {
    return (
      <div className="grid h-full grid-cols-2 gap-2 rounded-lg border border-slate-200 bg-gradient-to-b from-slate-50 to-white p-3">
        {/* 카드/차트들 */}
        <div className="rounded-lg bg-emerald-100 p-2 shadow-sm">
          <div className="mb-2 h-2.5 w-10 rounded bg-emerald-400" />
          <div className="h-10 rounded-md bg-emerald-300/80" />
        </div>
        <div className="rounded-lg bg-amber-100 p-2 shadow-sm">
          <div className="mb-2 h-2.5 w-10 rounded bg-amber-400" />
          <div className="h-10 rounded-md bg-amber-300/80" />
        </div>
        <div className="col-span-2 rounded-lg bg-blue-100 p-2 shadow-sm">
          <div className="mb-2 h-2.5 w-12 rounded bg-blue-400" />
          <div className="flex h-14 items-end gap-1">
            {[...Array(10)].map((_, i) => (
              <div
                key={i}
                className="flex-1 rounded-t bg-blue-400/80"
                style={{ height: `${25 + Math.random() * 75}%` }}
              />
            ))}
          </div>
        </div>
        {/* 컴포넌트 수 */}
        <div className="absolute bottom-2 right-2 rounded-md bg-slate-800/80 px-2 py-1 text-[10px] font-medium text-white shadow-sm">
          {totalComponents}개
        </div>
      </div>
    );
  }

  // 액션 화면 일러스트 (버튼 중심)
  if (screenType === "action") {
    return (
      <div className="flex h-full flex-col items-center justify-center gap-4 rounded-lg border border-slate-200 bg-gradient-to-b from-slate-50 to-white p-3">
        <div className="rounded-full bg-slate-100 p-4 text-slate-400">
          <MousePointer2 className="h-10 w-10" />
        </div>
        <div className="flex gap-3">
          <div className="h-7 w-16 rounded-md bg-blue-500 shadow-sm" />
          <div className="h-7 w-16 rounded-md bg-slate-300 shadow-sm" />
        </div>
        <div className="text-xs font-medium text-slate-400">액션 화면</div>
        {/* 컴포넌트 수 */}
        <div className="absolute bottom-2 right-2 rounded-md bg-slate-800/80 px-2 py-1 text-[10px] font-medium text-white shadow-sm">
          {totalComponents}개
        </div>
      </div>
    );
  }

  // 기본 (알 수 없는 타입)
  return (
    <div className="flex h-full flex-col items-center justify-center gap-3 rounded-lg border border-slate-200 bg-gradient-to-b from-slate-50 to-white text-slate-400">
      <div className="rounded-full bg-slate-100 p-4">
        {getScreenTypeIcon(screenType)}
      </div>
      <span className="text-sm font-medium">{totalComponents}개 컴포넌트</span>
    </div>
  );
};

// ========== 테이블 노드 (하단) - 컬럼 목록 표시 ==========
export const TableNode: React.FC<{ data: TableNodeData }> = ({ data }) => {
  const { label, subLabel, isMain, columns } = data;

  return (
    <div className="group relative flex h-[320px] w-[260px] flex-col overflow-hidden rounded-lg border border-border bg-card shadow-md transition-all hover:shadow-lg hover:ring-2 hover:ring-emerald-500/20">
      {/* Handles */}
      <Handle
        type="target"
        position={Position.Top}
        id="top"
        className="!h-2 !w-2 !border-2 !border-background !bg-emerald-500 opacity-0 transition-opacity group-hover:opacity-100"
      />
      <Handle
        type="target"
        position={Position.Left}
        id="left"
        className="!h-2 !w-2 !border-2 !border-background !bg-emerald-500 opacity-0 transition-opacity group-hover:opacity-100"
      />
      <Handle
        type="source"
        position={Position.Right}
        id="right"
        className="!h-2 !w-2 !border-2 !border-background !bg-emerald-500 opacity-0 transition-opacity group-hover:opacity-100"
      />

      {/* 헤더 (초록색) */}
      <div className={`flex items-center gap-2 px-3 py-2 text-white ${isMain ? "bg-emerald-600" : "bg-slate-500"}`}>
        <Database className="h-4 w-4" />
        <div className="flex-1 min-w-0">
          <div className="truncate text-xs font-semibold">{label}</div>
          {subLabel && <div className="truncate text-[10px] opacity-80">{subLabel}</div>}
        </div>
      </div>

      {/* 컬럼 목록 */}
      <div className="flex-1 overflow-hidden p-2">
        {columns && columns.length > 0 ? (
          <div className="flex h-full flex-col gap-0.5">
            {columns.map((col, idx) => (
              <div
                key={idx}
                className="flex items-center gap-1.5 rounded bg-slate-50 px-2 py-1 hover:bg-slate-100"
              >
                {/* PK/FK 아이콘 */}
                {col.isPrimaryKey && <Key className="h-3 w-3 text-amber-500" />}
                {col.isForeignKey && !col.isPrimaryKey && <Link2 className="h-3 w-3 text-blue-500" />}
                {!col.isPrimaryKey && !col.isForeignKey && <div className="w-3" />}

                {/* 컬럼명 */}
                <span className="flex-1 truncate font-mono text-[10px] font-medium text-slate-700">
                  {col.name}
                </span>

                {/* 타입 */}
                <span className="text-[9px] text-slate-400">{col.type}</span>
              </div>
            ))}

            {columns.length > 8 && (
              <div className="text-center text-[9px] text-slate-400">... 외 {columns.length - 8}개 컬럼</div>
            )}
          </div>
        ) : (
          <div className="flex h-full flex-col items-center justify-center text-muted-foreground">
            <Database className="h-6 w-6 text-slate-300" />
            <span className="mt-1 text-[9px] text-slate-400">컬럼 정보 없음</span>
          </div>
        )}
      </div>

      {/* 푸터 */}
      <div className="flex items-center justify-between border-t border-border bg-muted/30 px-3 py-1.5">
        <span className="text-[10px] text-muted-foreground">PostgreSQL</span>
        {columns && (
          <span className="text-[10px] text-muted-foreground">{columns.length}개 컬럼</span>
        )}
      </div>
    </div>
  );
};

// ========== 기존 호환성 유지용 ==========
export const LegacyScreenNode = ScreenNode;
export const AggregateNode: React.FC<{ data: any }> = ({ data }) => {
  return (
    <div className="rounded-lg border-2 border-purple-300 bg-white p-3 shadow-lg">
      <Handle type="target" position={Position.Left} id="left" className="!h-3 !w-3 !bg-purple-500" />
      <Handle type="source" position={Position.Right} id="right" className="!h-3 !w-3 !bg-purple-500" />
      <div className="flex items-center gap-2 text-purple-600">
        <Table2 className="h-4 w-4" />
        <span className="text-sm font-semibold">{data.label || "Aggregate"}</span>
      </div>
    </div>
  );
};