import 'package:flutter/material.dart';

import '../core/app_trash.dart';
import '../core/file_ops.dart' show formatSize;
import '../l10n/tr.dart';
import 'confirm.dart';
import 'theme.dart';

/// X-plore 비교 e: 앱 휴지통 화면 (Android) - 항목 · 원래 자리 · 지운 때, 골라서 되살리기 · 영구 삭제, 모두 비우기.
/// 돌려주는 값: 되살린 경로들 (탐색기가 그 폴더를 새로 읽는다)
class TrashPage extends StatefulWidget {
  final AppTrash trash;

  /// 보관 일 (0 = 끔) - 안내 줄에
  final int days;
  const TrashPage({super.key, required this.trash, required this.days});

  @override
  State<TrashPage> createState() => _TrashPageState();
}

class _TrashPageState extends State<TrashPage> {
  List<TrashItem>? _items;
  final _picked = <String>{};
  final _restored = <String>[];
  bool _busy = false;

  @override
  void initState() {
    super.initState();
    _load();
  }

  Future<void> _load() async {
    final items = await widget.trash.list();
    if (!mounted) return;
    setState(() {
      _items = items;
      _picked.removeWhere((x) => !items.any((i) => i.entryDir == x));
    });
  }

  List<TrashItem> get _chosen => [for (final i in _items ?? const <TrashItem>[]) if (_picked.contains(i.entryDir)) i];

  void _say(String t) => ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(t)));

  Future<void> _restore(List<TrashItem> items) async {
    setState(() => _busy = true);
    var n = 0;
    final fails = <String>[];
    for (final i in items) {
      try {
        _restored.add(await widget.trash.restore(i));
        n++;
      } catch (e) {
        fails.add('${i.name}: $e');
      }
    }
    await _load();
    if (!mounted) return;
    setState(() => _busy = false);
    _say([
      if (n > 0) trf('{0}개를 원래 자리로 되살렸습니다', [n]),
      if (fails.isNotEmpty) trf('되살리지 못함: {0}', [fails.take(3).join(' · ')]),
    ].join(' · '));
  }

  Future<void> _purge(List<TrashItem> items, {bool all = false}) async {
    final ok = await confirmAction(
      context,
      title: all ? tr('휴지통 비우기') : trf('{0}개를 영구 삭제할까요?', [items.length]),
      body: tr('휴지통에서 지운 것은 되살릴 수 없습니다.'),
      ok: tr('영구 삭제'),
    );
    if (!ok || !mounted) return;
    setState(() => _busy = true);
    for (final i in items) {
      try {
        await widget.trash.purge(i);
      } catch (_) {}
    }
    await _load();
    if (mounted) setState(() => _busy = false);
  }

  String _date(DateTime d) =>
      '${d.year}-${d.month.toString().padLeft(2, '0')}-${d.day.toString().padLeft(2, '0')} ${d.hour.toString().padLeft(2, '0')}:${d.minute.toString().padLeft(2, '0')}';

  @override
  Widget build(BuildContext context) {
    final items = _items;
    final chosen = _chosen;
    final total = (items ?? const <TrashItem>[]).fold<int>(0, (a, b) => a + b.size);
    return PopScope(
      canPop: false,
      onPopInvokedWithResult: (didPop, _) {
        if (!didPop) Navigator.pop(context, _restored);
      },
      child: Scaffold(
        appBar: AppBar(
          title: Text(items == null ? tr('휴지통') : trf('휴지통 · {0}개 · {1}', [items.length, formatSize(total)])),
          actions: [
            if (items != null && items.isNotEmpty)
              TextButton.icon(
                onPressed: _busy ? null : () => _purge(items, all: true),
                icon: const Icon(Icons.delete_forever_outlined, color: JjColors.danger),
                label: Text(tr('비우기'), style: const TextStyle(color: JjColors.danger)),
              ),
          ],
        ),
        body: Column(children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(16, 8, 16, 4),
            child: Text(
              widget.days > 0
                  ? trf('지운 것은 {0}일 동안 여기에 두었다가 저절로 지웁니다 (환경 설정 > 파일 탐색기 > 휴지통 보관).', [widget.days])
                  : tr('휴지통이 꺼져 있습니다 - 지우면 바로 영구 삭제됩니다 (환경 설정 > 파일 탐색기 > 휴지통 보관).'),
              style: const TextStyle(fontSize: 12, color: JjColors.textDim),
            ),
          ),
          if (_busy) const LinearProgressIndicator(minHeight: 2),
          Expanded(
            child: items == null
                ? const Center(child: CircularProgressIndicator())
                : items.isEmpty
                    ? Center(child: Text(tr('휴지통이 비어 있습니다')))
                    : ListView.builder(
                        itemCount: items.length,
                        itemBuilder: (_, k) {
                          final i = items[k];
                          final on = _picked.contains(i.entryDir);
                          return CheckboxListTile(
                            value: on,
                            onChanged: (v) => setState(() => v == true ? _picked.add(i.entryDir) : _picked.remove(i.entryDir)),
                            secondary: Icon(i.isDir ? Icons.folder : Icons.insert_drive_file_outlined,
                                color: i.isDir ? Colors.amber : null),
                            title: Text(i.name, maxLines: 1, overflow: TextOverflow.ellipsis),
                            subtitle: Text('${i.original}\n${_date(i.deletedAt)} · ${formatSize(i.size)}',
                                maxLines: 2, overflow: TextOverflow.ellipsis, style: const TextStyle(fontSize: 11)),
                            isThreeLine: true,
                          );
                        },
                      ),
          ),
          if (chosen.isNotEmpty)
            SafeArea(
              top: false,
              child: Padding(
                padding: const EdgeInsets.all(8),
                child: Row(children: [
                  Expanded(child: Text(trf('{0}개 고름', [chosen.length]))),
                  TextButton(
                    onPressed: _busy ? null : () => _purge(chosen),
                    child: Text(tr('영구 삭제'), style: const TextStyle(color: JjColors.danger)),
                  ),
                  const SizedBox(width: 8),
                  FilledButton.icon(
                    onPressed: _busy ? null : () => _restore(chosen),
                    icon: const Icon(Icons.restore),
                    label: Text(tr('되살리기')),
                  ),
                ]),
              ),
            ),
        ]),
      ),
    );
  }
}