'use client';

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

interface ControlToolbarProps {
  dashboardId: string;
}

export function ControlToolbar({ dashboardId }: ControlToolbarProps) {
  const { mode, setMode, ruleNodes, ruleConnections, activeRuleId, setActiveRuleId, setRuleNodes, setRuleConnections } = useControlMode();
  const [ruleList, setRuleList] = useState<Record<string, any>[]>([]);
  const [showRuleList, setShowRuleList] = useState(false);

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

  // ★ 기존 규칙 로드 → 편집 상태 복원
  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 () => {
    try {
      const data = {
        name: `규칙 ${new Date().toLocaleString('ko-KR')}`,
        nodes: ruleNodes,
        connections: ruleConnections,
      };
      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');
    }
  };

  return (
    <div className="ctrl-toolbar">
      <span style={{ fontWeight: 700, color: 'var(--ctrl-cyan)', marginRight: '.5rem' }}>⚡ 제어 모드</span>
      <div className="ctrl-toolbar-mode">
        <button
          className={`ctrl-mode-btn${mode === 'view' ? ' on' : ''}`}
          onClick={() => setMode('view')}
        >
          <Eye size={12} style={{ marginRight: 3 }} />
          읽기
        </button>
        <button
          className={`ctrl-mode-btn${mode === 'edit' ? ' on' : ''}`}
          onClick={() => setMode('edit')}
        >
          <Wrench size={12} style={{ marginRight: 3 }} />
          편집
        </button>
      </div>
      {mode === 'edit' && (
        <div style={{ marginLeft: 'auto', display: 'flex', gap: '.3rem', position: 'relative' }}>
          {/* ★ 기존 규칙 로드 버튼 */}
          <button className="ctrl-mode-btn" onClick={() => setShowRuleList(!showRuleList)}>
            <FolderOpen size={12} style={{ marginRight: 3 }} />
            불러오기{ruleList.length > 0 ? ` (${ruleList.length})` : ''}
          </button>
          {/* ★ 규칙 목록 드롭다운 */}
          {showRuleList && ruleList.length > 0 && (
            <div style={{
              position: 'absolute', top: '100%', right: 0, marginTop: 4,
              background: 'var(--ctrl-glass-strong, rgba(17,16,42,.65))',
              border: '1px solid var(--ctrl-glass-border, rgba(162,155,254,.12))',
              borderRadius: 8, padding: '.3rem', minWidth: 200, zIndex: 100,
              backdropFilter: 'blur(20px) saturate(1.4)',
            }}>
              {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}
                    onClick={() => handleLoadRule(id)}
                    style={{
                      display: 'block', width: '100%', textAlign: 'left',
                      padding: '.3rem .5rem', borderRadius: 6, border: 'none',
                      background: isActive ? 'rgba(0,206,201,.12)' : 'transparent',
                      color: isActive ? 'var(--ctrl-cyan)' : 'var(--v5-text-sec)',
                      fontSize: '.55rem', cursor: 'pointer',
                    }}
                  >
                    {name}
                  </button>
                );
              })}
            </div>
          )}
          {ruleNodes.length > 0 && (
            <button className="ctrl-mode-btn" onClick={handleSave}>
              <Save size={12} style={{ marginRight: 3 }} />
              규칙 저장
            </button>
          )}
        </div>
      )}
    </div>
  );
}