// 백업 기록: list the automatic/manual backups, restore one (undoable) or download it.
import React, { useEffect, useState } from 'react';
import { X } from 'lucide-react';
import { deleteBackup, listBackups, MAX_BACKUPS, type BackupRecord } from './backupStore';

interface Props {
  onRestore: (rec: BackupRecord) => void;
  onBackupNow: () => Promise<void>;
  onClose: () => void;
}

export const BackupModal: React.FC<Props> = ({ onRestore, onBackupNow, onClose }) => {
  const [items, setItems] = useState<BackupRecord[] | null>(null);
  const [error, setError] = useState<string | null>(null);
  const reload = () => listBackups().then(setItems).catch((e) => setError(e instanceof Error ? e.message : String(e)));
  useEffect(() => { void reload(); }, []);
  const download = (b: BackupRecord) => {
    const a = document.createElement('a');
    a.href = URL.createObjectURL(new Blob([b.inp], { type: 'text/plain;charset=utf-8' }));
    a.download = `${b.fileName.replace(/\.[^.]+$/, '')}_백업_${b.savedAt.slice(0, 16).replace(/[-:T]/g, '')}.inp`;
    a.click();
    URL.revokeObjectURL(a.href);
  };
  return (
    <div role="dialog" aria-modal="true" aria-label="백업 기록" style={{ position: 'fixed', inset: 0, background: 'rgba(15,23,42,.35)', zIndex: 3000, display: 'flex', alignItems: 'center', justifyContent: 'center' }} onClick={onClose}>
      <div onClick={(e) => e.stopPropagation()} style={{ width: 'min(640px, 96vw)', maxHeight: '86vh', background: 'var(--bg-panel)', borderRadius: 8, boxShadow: '0 12px 40px rgba(0,0,0,.25)', display: 'flex', flexDirection: 'column' }}>
        <div style={{ display: 'flex', alignItems: 'center', padding: '10px 14px', borderBottom: '1px solid var(--border)' }}>
          <b style={{ flex: 1 }}>백업 기록</b>
          <button className="btn btn-ghost" onClick={onClose} aria-label="닫기"><X size={14} /></button>
        </div>
        <div style={{ padding: 14, display: 'flex', flexDirection: 'column', gap: 10, fontSize: 12, overflow: 'auto' }}>
          <div style={{ display: 'flex', gap: 8, alignItems: 'center' }}>
            <span style={{ flex: 1, color: 'var(--text-secondary)' }}>
              모델이 수정된 상태면 10분마다 이 브라우저에 자동으로 백업합니다 (최근 {MAX_BACKUPS}개). 복원은 실행 취소(Ctrl+Z)로 되돌릴 수 있습니다.
            </span>
            <button className="btn btn-secondary" style={{ height: 26 }} onClick={() => void onBackupNow().then(reload)}>지금 백업</button>
          </div>
          {error && <div style={{ color: 'var(--crit)' }}>{error}</div>}
          {items && !items.length && <div style={{ color: 'var(--text-muted)' }}>백업이 아직 없습니다.</div>}
          {items && items.length > 0 && (
            <table style={{ width: '100%', borderCollapse: 'collapse' }}>
              <thead><tr>{['시각', '파일', '규모', '', ''].map((h, i) => <th key={i} style={{ textAlign: 'left', padding: '4px 6px', background: 'var(--bg-subtle)' }}>{h}</th>)}</tr></thead>
              <tbody>
                {items.map((b) => (
                  <tr key={b.id} style={{ borderTop: '1px solid var(--border)' }}>
                    <td style={{ padding: '4px 6px' }}>{new Date(b.savedAt).toLocaleString('ko-KR')}{b.reason === 'manual' ? ' (수동)' : ''}</td>
                    <td style={{ padding: '4px 6px' }}>{b.fileName}</td>
                    <td style={{ padding: '4px 6px' }}>절점 {b.nodes} · 링크 {b.links}</td>
                    <td style={{ padding: '4px 6px' }}>
                      <button className="btn btn-secondary" style={{ height: 22, fontSize: 11 }} onClick={() => { onRestore(b); onClose(); }}>복원</button>{' '}
                      <button className="btn btn-ghost" style={{ height: 22, fontSize: 11 }} onClick={() => download(b)}>.inp</button>
                    </td>
                    <td style={{ padding: '4px 6px' }}>
                      <button className="btn btn-ghost" style={{ height: 22, fontSize: 11 }} aria-label="백업 삭제" onClick={() => void deleteBackup(b.id).then(reload)}><X size={11} /></button>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          )}
        </div>
      </div>
    </div>
  );
};