'use client';

import { useState, useEffect, useCallback } from 'react';
import { Eye, Wrench, Save, FolderOpen, X, Database } from 'lucide-react';
import { useControlMode } from './hooks/useControlMode';
import {
  getBusinessRuleList,
  getBusinessRuleInfo,
  insertBusinessRule,
  updateBusinessRule,
} from '@/lib/api/businessRule';
import { toast } from 'sonner';

interface ControlCardPanelProps {
  dashboardId: string;
  card: Record<string, any>;
}

/**
 * 선택된 카드의 부속 제어 패널
 * - 카드가 좌측 상단(예: left:20, top:90, 320x240)으로 축소되면
 *   이 패널이 카드 바로 오른쪽 (left:360, top:90 부근)에 floating
 * - 패널 안: 카드명 / [읽기 | 편집] 토글 / 액션 / ✕ 닫기
 */
export function ControlCardPanel({ dashboardId, card }: ControlCardPanelProps) {
  const {
    mode,
    setMode,
    setSelectedCardId,
    ruleNodes,
    ruleConnections,
    activeRuleId,
    setActiveRuleId,
    setRuleNodes,
    setRuleConnections,
  } = useControlMode();
  const [ruleList, setRuleList] = useState<Record<string, any>[]>([]);
  const [showRuleList, setShowRuleList] = useState(false);

  const cardLabel =
    card.title ?? card.TITLE ?? card.template_name ?? card.TEMPLATE_NAME ?? '제목 없음';
  const cardTable =
    card.primary_table ?? card.PRIMARY_TABLE ?? card.source_table ?? card.SOURCE_TABLE ?? null;
  const cardType =
    card.component_type ?? card.COMPONENT_TYPE ?? card.template_type ?? card.TEMPLATE_TYPE ?? null;

  // 편집 모드에서만 규칙 목록 로드
  useEffect(() => {
    if (mode !== 'edit') return;
    getBusinessRuleList(dashboardId)
      .then((res) => setRuleList(res?.list ?? res?.data ?? []))
      .catch(() => setRuleList([]));
  }, [mode, dashboardId]);

  const handleLoadRule = useCallback(
    async (ruleId: string) => {
      try {
        const detail = await getBusinessRuleInfo(ruleId);
        if (!detail) {
          toast.error('규칙을 찾을 수 없습니다');
          return;
        }
        setRuleNodes(detail.nodes ?? []);
        setRuleConnections(detail.connections ?? []);
        setActiveRuleId(ruleId);
        setShowRuleList(false);
        toast.success(`"${detail.name ?? ruleId}" 로드됨`);
      } catch {
        toast.error('규칙 로드 실패');
      }
    },
    [setRuleNodes, setRuleConnections, setActiveRuleId],
  );

  const handleSave = async () => {
    if (ruleNodes.length === 0) {
      toast.warning('저장할 노드가 없습니다');
      return;
    }
    try {
      const data = {
        name: `${cardLabel} 규칙 ${new Date().toLocaleString('ko-KR')}`,
        nodes: ruleNodes,
        connections: ruleConnections,
        card_id: card.card_id ?? card.CARD_ID ?? card.id,
      };
      if (activeRuleId) {
        await updateBusinessRule(activeRuleId, data);
        toast.success('규칙 저장됨');
      } else {
        const result = await insertBusinessRule(dashboardId, data);
        if (result?.rule_id) setActiveRuleId(result.rule_id);
        toast.success('규칙 생성됨');
      }
    } catch {
      toast.error('저장 실패');
    }
  };

  const handleSourceDragStart = (e: React.DragEvent) => {
    if (!cardTable) return;
    e.dataTransfer.setData('text/plain', JSON.stringify({ kind: 'table', name: cardTable }));
    e.dataTransfer.effectAllowed = 'copy';
  };

  return (
    <div className="ctrl-card-panel">
      {/* 헤더 — "제어" + ✕ 닫기 (카드명은 좌측 카드 자체에 이미 보이므로 중복 X) */}
      <div className="ctrl-card-panel-head">
        <div className="ctrl-card-panel-icon">⚡</div>
        <div className="ctrl-card-panel-title-wrap">
          <div className="ctrl-card-panel-title">제어</div>
          {cardType && <div className="ctrl-card-panel-type">{cardType}</div>}
        </div>
        <button
          className="ctrl-card-panel-close"
          onClick={() => setSelectedCardId(null)}
          title="제어 해제"
        >
          <X size={11} />
        </button>
      </div>

      {/* 데이터 소스 칩 (드래그 가능, 편집 모드에서 룰 빌더로 추가) */}
      {cardTable && (
        <div className="ctrl-card-panel-source">
          <span
            className="ctrl-card-panel-source-chip"
            draggable={mode === 'edit'}
            onDragStart={mode === 'edit' ? handleSourceDragStart : undefined}
            title={mode === 'edit' ? '드래그해서 룰 빌더에 추가' : '데이터 소스'}
          >
            <Database size={9} />
            <span>{cardTable}</span>
          </span>
        </div>
      )}

      {/* 모드 토글 — 카드 컨텍스트 안의 segmented */}
      <div className="ctrl-card-panel-mode">
        <button
          className={`ctrl-card-panel-mode-btn${mode === 'view' ? ' on' : ''}`}
          onClick={() => setMode('view')}
          title="읽기 — 자동 트리 자람"
        >
          <Eye size={10} />
          <span>읽기</span>
        </button>
        <button
          className={`ctrl-card-panel-mode-btn${mode === 'edit' ? ' on' : ''}`}
          onClick={() => setMode('edit')}
          title="편집 — 팔레트에서 직접 작성"
        >
          <Wrench size={10} />
          <span>편집</span>
        </button>
      </div>

      {/* 편집 모드 액션 */}
      {mode === 'edit' && (
        <>
          <div className="ctrl-card-panel-actions">
            <div style={{ position: 'relative', flex: 1 }}>
              <button
                className="ctrl-card-panel-btn"
                onClick={() => setShowRuleList(!showRuleList)}
                disabled={ruleList.length === 0}
                title="저장된 규칙 불러오기"
              >
                <FolderOpen size={10} />
                <span>불러오기{ruleList.length > 0 ? ` (${ruleList.length})` : ''}</span>
              </button>
              {showRuleList && ruleList.length > 0 && (
                <div className="ctrl-card-panel-dropdown">
                  {ruleList.map((rule) => {
                    const id = rule.rule_id ?? rule.RULE_ID;
                    const name = rule.name ?? rule.NAME ?? id;
                    const isActive = id === activeRuleId;
                    return (
                      <button
                        key={id}
                        className={`ctrl-card-panel-dropdown-item${isActive ? ' active' : ''}`}
                        onClick={() => handleLoadRule(id)}
                      >
                        {name}
                      </button>
                    );
                  })}
                </div>
              )}
            </div>
            <button
              className="ctrl-card-panel-btn primary"
              onClick={handleSave}
              disabled={ruleNodes.length === 0}
              title="현재 룰 저장"
            >
              <Save size={10} />
              <span>저장</span>
            </button>
          </div>
          {ruleNodes.length > 0 && (
            <div className="ctrl-card-panel-status">
              {ruleNodes.length}개 노드 · {ruleConnections.length}개 연결
            </div>
          )}
        </>
      )}

      {mode === 'view' && (
        <div className="ctrl-card-panel-hint">
          우측에 데이터 흐름이 자동으로 펼쳐집니다
        </div>
      )}
    </div>
  );
}