'use client';

import { useEffect, useMemo, useState } from 'react';
import { Search, Star } from 'lucide-react';
import { CTRL_NODE_TYPES, useControlMode } from './hooks/useControlMode';
import { getMetaTableList } from '@/lib/api/meta';

interface ControlPaletteProps {
  onDropTable: (tableName: string, x: number, y: number) => void;
  onDropControl: (type: string, x: number, y: number) => void;
}

/**
 * 제어 모드 팔레트 — 사이드바 교체
 * - 검색박스
 * - ⭐ 시연용 추천 (화이트리스트)
 * - DB 테이블 max-height + 내부 스크롤
 * - 영어/한국어 동시 표시
 * - 제어 노드 16종 카테고리별 그룹
 */

// 시연용 추천 화이트리스트 (있을 만한 ERP 표준 테이블 + 메뉴 캡쳐에서 확인된 것)
const RECOMMENDED_TABLES = [
  'user_info',
  'department',
  'role_info',
  'menu_master',
  'authority_master',
  'approval_definitions',
  'approval_requests',
  'approval_lines',
  'audit_log',
  'attach_file_info',
];

// 도메인 아이콘 매핑 (prefix 기준)
function pickIcon(name: string): string {
  const n = name.toLowerCase();
  if (n.startsWith('user') || n === 'user_info') return '👤';
  if (n.startsWith('department') || n.startsWith('dept')) return '🏢';
  if (n.startsWith('role') || n.startsWith('authority')) return '🛡';
  if (n.startsWith('menu')) return '📂';
  if (n.startsWith('approval')) return '✋';
  if (n.startsWith('audit') || n.startsWith('log')) return '📜';
  if (n.startsWith('attach') || n.startsWith('file')) return '📎';
  if (n.startsWith('mail')) return '📨';
  if (n.startsWith('ai_')) return '🤖';
  if (n.startsWith('order')) return '📦';
  if (n.startsWith('project')) return '📋';
  if (n.startsWith('barcode') || n.startsWith('label')) return '🏷';
  if (n.startsWith('batch')) return '⚙';
  if (n.startsWith('config') || n.startsWith('setting')) return '⚙';
  return '🗂';
}

export function ControlPalette(_props: ControlPaletteProps) {
  const [tables, setTables] = useState<Record<string, any>[]>([]);
  const [search, setSearch] = useState('');
  const mode = useControlMode((s) => s.mode);
  const isEditMode = mode === 'edit';

  useEffect(() => {
    getMetaTableList().then(setTables).catch(() => {});
  }, []);

  // 검색 + 추천/일반 분리
  const { recommended, others } = useMemo(() => {
    const q = search.trim().toLowerCase();
    const filtered = q
      ? tables.filter((t) => {
          const name = String(t.table_name ?? t.TABLE_NAME ?? '').toLowerCase();
          const label = String(t.table_label ?? t.TABLE_LABEL ?? '').toLowerCase();
          return name.includes(q) || label.includes(q);
        })
      : tables;

    const rec: Record<string, any>[] = [];
    const oth: Record<string, any>[] = [];
    filtered.forEach((t) => {
      const name = String(t.table_name ?? t.TABLE_NAME ?? '').toLowerCase();
      if (RECOMMENDED_TABLES.includes(name)) rec.push(t);
      else oth.push(t);
    });

    // 추천은 화이트리스트 순서 유지
    rec.sort((a, b) => {
      const an = String(a.table_name ?? a.TABLE_NAME ?? '').toLowerCase();
      const bn = String(b.table_name ?? b.TABLE_NAME ?? '').toLowerCase();
      return RECOMMENDED_TABLES.indexOf(an) - RECOMMENDED_TABLES.indexOf(bn);
    });

    return { recommended: rec, others: oth };
  }, [tables, search]);

  const handleDragStart = (e: React.DragEvent, data: Record<string, any>) => {
    e.dataTransfer.setData('text/plain', JSON.stringify(data));
    e.dataTransfer.effectAllowed = 'copy';
  };

  const catLabels: Record<string, string> = {
    트리거: '트리거',
    조건: '조건 / 분기',
    액션: '액션',
    흐름: '흐름 제어',
    연동: '외부 연동',
    기록: '기록',
  };
  const cats = ['트리거', '조건', '액션', '흐름', '연동', '기록'];

  const renderTableItem = (t: Record<string, any>, isRecommended: boolean) => {
    const name = t.table_name ?? t.TABLE_NAME;
    const rawLabel = t.table_label ?? t.TABLE_LABEL;
    const label = rawLabel && rawLabel !== name ? rawLabel : null;
    const icon = pickIcon(String(name));
    return (
      <div
        key={name}
        className={`ctrl-palette-item${isRecommended ? ' ctrl-palette-item-rec' : ''}`}
        draggable
        title={`${label ?? name}${label ? ` (${name})` : ''} — 캔버스로 드래그`}
        onDragStart={(e) => handleDragStart(e, { kind: 'table', name })}
      >
        <span className="cp-icon">{icon}</span>
        <span className="cp-label">
          <span className="cp-label-main">{label ?? name}</span>
          {label && <span className="cp-label-sub">{name}</span>}
        </span>
        {isRecommended && <Star size={9} className="cp-rec-star" />}
      </div>
    );
  };

  return (
    <div className="ctrl-palette">
      {/* 헤더 */}
      <div className="ctrl-palette-header">
        <span className="ctrl-palette-header-title">제어 팔레트</span>
        {!isEditMode && (
          <span className="ctrl-palette-header-hint">편집 모드에서 활성</span>
        )}
      </div>

      {/* 검색박스 */}
      <div className="ctrl-palette-search-wrap">
        <Search size={11} className="ctrl-palette-search-icon" />
        <input
          type="text"
          className="ctrl-palette-search"
          placeholder="테이블 / 노드 검색…"
          value={search}
          onChange={(e) => setSearch(e.target.value)}
          disabled={!isEditMode}
        />
      </div>

      <div
        className={`ctrl-palette-scroll${!isEditMode ? ' disabled' : ''}`}
        style={{ pointerEvents: isEditMode ? 'auto' : 'none' }}
      >
        {/* 주요 테이블 (자주 쓰는 ERP 표준) */}
        {recommended.length > 0 && (
          <>
            <div className="ctrl-palette-section ctrl-palette-section-rec">
              <Star size={9} style={{ marginRight: 3, fill: 'currentColor' }} />
              주요 테이블
              <span className="ctrl-palette-section-count">{recommended.length}</span>
            </div>
            <div className="ctrl-palette-tables">
              {recommended.map((t) => renderTableItem(t, true))}
            </div>
          </>
        )}

        {/* 전체 DB 테이블 (max-height + 내부 스크롤) */}
        <div className="ctrl-palette-section">
          DB 테이블
          {others.length > 0 && <span className="ctrl-palette-section-count">{others.length}</span>}
        </div>
        <div className="ctrl-palette-tables ctrl-palette-tables-others">
          {others.map((t) => renderTableItem(t, false))}
          {others.length === 0 && search && (
            <div className="ctrl-palette-empty">검색 결과 없음</div>
          )}
          {others.length === 0 && !search && tables.length === 0 && (
            <div className="ctrl-palette-empty">로딩 중…</div>
          )}
        </div>

        {/* 제어 노드 카테고리별 */}
        {cats.map((cat) => {
          const items = Object.entries(CTRL_NODE_TYPES).filter(([, d]) => {
            if (d.cat !== cat) return false;
            if (!search.trim()) return true;
            const q = search.trim().toLowerCase();
            return d.label.toLowerCase().includes(q);
          });
          if (!items.length) return null;
          return (
            <div key={cat}>
              <div className="ctrl-palette-section">{catLabels[cat] ?? cat}</div>
              {items.map(([type, def]) => (
                <div
                  key={type}
                  className="ctrl-palette-item"
                  draggable
                  title={`${def.label} — 캔버스로 드래그`}
                  onDragStart={(e) => handleDragStart(e, { kind: 'control', type })}
                >
                  <span className="cp-icon">{def.icon}</span>
                  <span className="cp-label">
                    <span className="cp-label-main">{def.label}</span>
                  </span>
                </div>
              ))}
            </div>
          );
        })}
      </div>
    </div>
  );
}