/// 上传中心（UI-03 页面 14/15：上传中心 + 异常任务视图）。
///
/// 页头「Uploads」（24sp）+ 右上「History」入口（→ 服务端记录页，与
/// 本机队列数据源区分）。摘要卡（范围标注「相册·时间·本设备」+ 四组
/// 任务数：已完成（放大突出）/上传中/等待中/需关注——按任务数统计，
/// 单任务百分比才走字节进度；**不随状态筛选变口径**，异常视图下摘要
/// 仍显示全量计数）。主筛选 = 大号三段（All / Active / Needs attention）；
/// 次级筛选（相册 × 时间 × 已完成）收进筛选图标菜单（BottomSheet）。
/// 任务行 = 缩略图 + 文件名 + 相册 + 状态徽章（StateBadge 图标+文案+
/// 颜色三重表达）+ 状态专属文案/操作（§4.4 表格：确认中不显示已公开、
/// 准备失败走重新选择而非普通重试、终态走「移除记录」并明确不删云端
/// 照片）+ 传输进度（进度总线行级订阅，不整页刷新）。存在可重试失败时
/// 底部「重试可恢复项」条（仅作用于可重试任务，文案说明范围）。
///
/// 列表经 TaskStore 写通知 + 200ms 防抖实时刷新（连拍风暴不逐条重建）。
library;

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../features/albums/album_format.dart';
import '../features/albums/providers.dart';
import '../features/uploads/engine_scope.dart';
import '../features/uploads/enqueue.dart';
import '../features/uploads/providers.dart';
import '../features/uploads/queue_controller.dart';
import '../features/uploads/queue_l10n.dart';
import '../features/uploads/task_state.dart';
import '../features/uploads/task_store.dart';
import '../ui/components/segment_tabs.dart';
import '../l10n/app_localizations.dart';
import '../ui/components/empty_state.dart';
import '../ui/components/error_state.dart';
import '../ui/components/state_badge.dart';
import '../ui/tokens.dart';

/// 队列 Tab（主壳 IndexedStack 内常驻）。
class QueueTab extends ConsumerWidget {
  const QueueTab({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final counts = ref.watch(taskCountsProvider);
    // 批量重试仅针对可重试失败（等待网络自动恢复，不混入；准备失败需
    // 重新选图，不能普通重试冒充恢复——§4.4）。
    final retryable = counts[UploadTaskState.retryableFailed] ?? 0;
    return Scaffold(
      appBar: AppBar(
        // 24sp 主标题（theme titleLarge）+ 右上「History」链接（§4 页面14）。
        title: Text(l10n.queue),
        actions: [
          Padding(
            padding: const EdgeInsets.only(right: kSpace8),
            child: TextButton.icon(
              onPressed: () =>
                  Navigator.of(context).pushNamed('/server-history'),
              icon: const Icon(Icons.history_outlined, size: 18),
              label: Text(l10n.uploadsHistory),
            ),
          ),
        ],
      ),
      body: const Column(
        children: [
          _SummaryCard(),
          _PrimaryFilterBar(),
          _NeedsAttentionNote(),
          Expanded(child: _TaskListView()),
        ],
      ),
      bottomNavigationBar: retryable > 0 ? const _BatchRetryBar() : null,
    );
  }
}

// ── 摘要卡 ────────────────────────────────────────────────────────────────

/// 顶部摘要：筛选范围标注 + 四组任务数（SQL 聚合，与列表同口径；**不受
/// 状态筛选影响**——页面 15 异常视图下仍显示全量计数，配说明行）。
class _SummaryCard extends ConsumerWidget {
  const _SummaryCard();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    final filter = ref.watch(queueFilterProvider);
    final albums = ref.watch(albumListProvider).items;
    final counts = ref.watch(queueSummaryProvider);

    // 范围标注：[相册名·]时间范围·本设备（本机任务库只含本设备任务，
    // 跨设备记录在服务端历史页——两者不合并统计）。
    final album = filter.albumId == null
        ? null
        : albums.where((a) => a.id == filter.albumId).firstOrNull;
    final scope = [
      if (album != null) albumDisplayTitle(album, l10n.localeName),
      _queueTimeLabel(l10n, filter.time),
      l10n.uploadsThisDevice,
    ].join(' · ');

    final light = theme.brightness == Brightness.light;
    // UI06：摘要直接排页背景（无白卡包裹）；范围行 13px、主数字 32px、
    // 副行 13px 中性（app-preview 示例 14）。
    return Padding(
      padding: const EdgeInsets.fromLTRB(kSpace16, kSpace16, kSpace16, 0),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            scope,
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
            style: theme.textTheme.bodySmall,
          ),
          const SizedBox(height: kSpace8),
          // 已完成突出（§4 页面 14：摘要突出已完成数）。
          _SummaryCount(
            value: completedSummaryOf(counts),
            label: l10n.uploadsCompleted,
            color: light ? kColorSuccess : kColorSuccessDark,
            emphasized: true,
          ),
          const SizedBox(height: kSpace4),
          Wrap(
            spacing: kSpace16,
            runSpacing: kSpace4,
            children: [
              _SummaryCount(
                value: uploadingSummaryOf(counts),
                label: l10n.uploadsUploading,
                color: theme.colorScheme.primary,
              ),
              _SummaryCount(
                value: waitingSummaryOf(counts),
                label: l10n.uploadsWaiting,
                color: light ? kColorWaiting : kColorWaitingDark,
              ),
              _SummaryCount(
                value: failedCountOf(counts),
                label: l10n.queueSummaryNeedAttention,
                color: light ? kColorError : kColorErrorDark,
              ),
            ],
          ),
        ],
      ),
    );
  }
}

/// 摘要单项：数字（主文字色、表格数字）+ 标签（语义色）；[emphasized]
/// 档用于突出的「已完成」（titleLarge）。
class _SummaryCount extends StatelessWidget {
  const _SummaryCount({
    required this.value,
    required this.label,
    required this.color,
    this.emphasized = false,
  });

  final int value;
  final String label;
  final Color color;
  final bool emphasized;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Row(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.baseline,
      textBaseline: TextBaseline.alphabetic,
      children: [
        Text(
          '$value',
          style:
              (emphasized
                      // UI06：主数字 32/40（app-preview 示例 14 .metric）
                      ? theme.textTheme.titleLarge?.copyWith(
                          fontSize: 32,
                          height: 40 / 32,
                          fontWeight: FontWeight.w700,
                          letterSpacing: -0.6,
                        )
                      : theme.textTheme.titleMedium)
                  ?.copyWith(
                    fontFeatures: const [FontFeature.tabularFigures()],
                  ),
        ),
        const SizedBox(width: kSpace4),
        Text(label, style: theme.textTheme.bodySmall?.copyWith(color: color)),
      ],
    );
  }
}

// ── 筛选栏 ────────────────────────────────────────────────────────────────

/// 时间快捷标签（「今天」与摘要口径共用一词，§4 页面 14 摘要「Today」）。
String _queueTimeLabel(AppLocalizations l10n, QueueTimeFilter time) =>
    switch (time) {
      QueueTimeFilter.all => l10n.queueTimeAll,
      QueueTimeFilter.today => l10n.uploadsToday,
      QueueTimeFilter.last7Days => l10n.queueTimeLast7Days,
      QueueTimeFilter.last30Days => l10n.queueTimeLast30Days,
    };

/// 主筛选（§4 页面 14）：大号三段 All / Active / Needs attention；次级
/// 筛选（相册 × 时间 × 已完成）收进筛选图标的 BottomSheet。
class _PrimaryFilterBar extends ConsumerWidget {
  const _PrimaryFilterBar();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    final filter = ref.watch(queueFilterProvider);

    return Material(
      color: theme.colorScheme.surfaceContainerLow,
      child: Padding(
        padding: const EdgeInsets.fromLTRB(kSpace16, kSpace8, kSpace8, kSpace8),
        child: Row(
          children: [
            Expanded(
              // UI06：轻量分段（app-preview .tabs——#EDF1F6 轨道/选中实蓝，
              // 替换 M3 SegmentedButton 黑边胶囊）。
              // 已完成经筛选菜单选择时三段不亮（属次级筛选，非主段）。
              child: SegmentTabs<QueueStateFilter>(
                value: filter.state == QueueStateFilter.completed
                    ? null
                    : filter.state,
                segments: [
                  (QueueStateFilter.all, l10n.uploadsAll),
                  (QueueStateFilter.inProgress, l10n.uploadsActive),
                  (QueueStateFilter.needsAttention, l10n.uploadsNeedsAttention),
                ],
                onChanged: (value) =>
                    ref.read(queueFilterProvider.notifier).setStateGroup(value),
              ),
            ),
            IconButton(
              tooltip: l10n.uploadsFilters,
              icon: const Icon(Icons.tune),
              onPressed: () => _openFilterSheet(context),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _openFilterSheet(BuildContext context) {
    return showModalBottomSheet<void>(
      context: context,
      showDragHandle: true,
      builder: (_) => const _FilterSheet(),
    );
  }
}

/// 次级筛选面板（相册 × 时间快捷 × 已完成）：单选即选即生效并收起。
class _FilterSheet extends ConsumerWidget {
  const _FilterSheet();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    final filter = ref.watch(queueFilterProvider);
    final albums = ref.watch(albumListProvider).items;

    void close() => Navigator.of(context).pop();
    // 相册组值：'' = 全部相册（选中相册不在列表时回退全部）。
    final albumValue = albums.any((a) => a.id == filter.albumId)
        ? (filter.albumId ?? '')
        : '';
    return SafeArea(
      child: ListView(
        shrinkWrap: true,
        padding: const EdgeInsets.only(bottom: kSpace16),
        children: [
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: kSpace16),
            child: Text(
              l10n.uploadsFilters,
              style: theme.textTheme.titleMedium,
            ),
          ),
          // 相册（单选即选即生效并收起）。
          RadioGroup<String>(
            groupValue: albumValue,
            onChanged: (albumId) {
              ref
                  .read(queueFilterProvider.notifier)
                  .setAlbum(albumId == '' ? null : albumId);
              close();
            },
            child: Column(
              children: [
                RadioListTile<String>(
                  value: '',
                  title: Text(l10n.queueAlbumFilterAll),
                ),
                for (final album in albums)
                  RadioListTile<String>(
                    value: album.id,
                    title: Text(
                      albumDisplayTitle(album, l10n.localeName),
                      maxLines: 1,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
              ],
            ),
          ),
          const Divider(indent: kSpace16, endIndent: kSpace16),
          // 时间快捷（今天为摘要默认口径，§4 页面 14）。
          RadioGroup<QueueTimeFilter>(
            groupValue: filter.time,
            onChanged: (time) {
              if (time != null) {
                ref.read(queueFilterProvider.notifier).setTime(time);
              }
              close();
            },
            child: Column(
              children: [
                for (final time in QueueTimeFilter.values)
                  RadioListTile<QueueTimeFilter>(
                    value: time,
                    title: Text(_queueTimeLabel(l10n, time)),
                  ),
              ],
            ),
          ),
          const Divider(indent: kSpace16, endIndent: kSpace16),
          // 已完成（主三段之外的状态组，收进筛选菜单——§4 页面 14）。
          ListTile(
            leading: Icon(
              filter.state == QueueStateFilter.completed
                  ? Icons.check_circle
                  : Icons.check_circle_outline,
              color: filter.state == QueueStateFilter.completed
                  ? theme.colorScheme.primary
                  : theme.colorScheme.onSurfaceVariant,
            ),
            title: Text(l10n.queueStateCompleted),
            onTap: () {
              ref
                  .read(queueFilterProvider.notifier)
                  .setStateGroup(
                    filter.state == QueueStateFilter.completed
                        ? QueueStateFilter.all
                        : QueueStateFilter.completed,
                  );
              close();
            },
          ),
        ],
      ),
    );
  }
}

/// 异常视图说明行（页面 15）：Needs attention 主段选中时常驻，说明列表
/// 已过滤而摘要仍是全量口径。
class _NeedsAttentionNote extends ConsumerWidget {
  const _NeedsAttentionNote();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    final state = ref.watch(
      queueFilterProvider.select((filter) => filter.state),
    );
    if (state != QueueStateFilter.needsAttention) {
      return const SizedBox.shrink();
    }
    return Padding(
      padding: const EdgeInsets.fromLTRB(kSpace16, kSpace8, kSpace16, 0),
      child: Row(
        children: [
          Icon(
            Icons.filter_alt_outlined,
            size: 14,
            color: theme.colorScheme.onSurfaceVariant,
          ),
          const SizedBox(width: kSpace8),
          Expanded(
            child: Text(
              l10n.uploadsShowingNeedsAttention,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          ),
        ],
      ),
    );
  }
}

// ── 任务列表 ──────────────────────────────────────────────────────────────

class _TaskListView extends ConsumerWidget {
  const _TaskListView();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final stateFilter = ref.watch(
      queueFilterProvider.select((filter) => filter.state),
    );
    final tasksAsync = ref.watch(queueTasksProvider);
    return tasksAsync.when(
      skipLoadingOnReload: true,
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (error, _) => ErrorState(
        message: l10n.errorGeneric,
        onRetry: () => ref.invalidate(queueTasksProvider),
      ),
      data: (tasks) {
        if (tasks.isEmpty) {
          // 页面 15：异常视图空态专用文案（区别于整体队列空态）。
          return EmptyState(
            icon: stateFilter == QueueStateFilter.needsAttention
                ? Icons.task_alt_outlined
                : Icons.cloud_upload_outlined,
            title: stateFilter == QueueStateFilter.needsAttention
                ? l10n.uploadsNoNeedsAttention
                : l10n.queueEmpty,
          );
        }
        return ListView.builder(
          padding: const EdgeInsets.symmetric(vertical: 4),
          itemCount: tasks.length,
          itemBuilder: (context, index) => _TaskTile(task: tasks[index]),
        );
      },
    );
  }
}

/// 单条任务行（§4 页面 14 状态表逐态落地）。
class _TaskTile extends ConsumerWidget {
  const _TaskTile({required this.task});

  final UploadTask task;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    final album = ref
        .watch(albumListProvider)
        .items
        .where((a) => a.id == task.albumId)
        .firstOrNull;
    final albumName = album != null
        ? albumDisplayTitle(album, l10n.localeName)
        : task.albumId;
    final failedLike =
        task.state == UploadTaskState.preparationFailed ||
        task.state == UploadTaskState.retryableFailed;

    return Padding(
      // 行键（task.id）供 widget 测试行级锚定（状态徽章/动作图标定位）。
      key: ValueKey('queue-task-${task.id}'),
      padding: const EdgeInsets.fromLTRB(kSpace16, kSpace8, kSpace16, kSpace8),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          _Thumb(path: task.cleanedAt == null ? task.sourceFilePath : null),
          const SizedBox(width: kSpace12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  task.filename,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: theme.textTheme.bodyMedium?.copyWith(
                    fontWeight: FontWeight.w600,
                  ),
                ),
                const SizedBox(height: 2),
                Text(
                  albumName,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: theme.textTheme.bodySmall?.copyWith(
                    color: theme.colorScheme.onSurfaceVariant,
                  ),
                ),
                const SizedBox(height: kSpace4),
                Row(
                  children: [
                    // 状态徽章即 §4.4「界面含义」列的唯一文案表达（图标 +
                    // 颜色 + 文字三重编码）；尝试次数（>0）为补充说明。
                    StateBadge(
                      compact: true,
                      variant: _badgeVariant(task.state),
                      label: _badgeLabel(l10n, task.state),
                    ),
                    if (task.attempt > 0) ...[
                      const SizedBox(width: kSpace8),
                      Text(
                        l10n.queueAttemptCount(task.attempt),
                        style: theme.textTheme.bodySmall?.copyWith(
                          color: theme.colorScheme.onSurfaceVariant,
                        ),
                      ),
                    ],
                  ],
                ),
                if (task.state == UploadTaskState.waitingNetwork) ...[
                  const SizedBox(height: 2),
                  Text(
                    l10n.queueWaitingNetworkHint,
                    style: theme.textTheme.bodySmall?.copyWith(
                      color: theme.brightness == Brightness.light
                          ? kColorWaiting
                          : kColorWaitingDark,
                    ),
                  ),
                ],
                if (failedLike && task.lastError != null) ...[
                  const SizedBox(height: 2),
                  Text(
                    l10n.messageForTaskError(task.lastError!),
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                    style: theme.textTheme.bodySmall?.copyWith(
                      color: theme.colorScheme.error,
                    ),
                  ),
                ],
                if (task.state == UploadTaskState.uploading ||
                    task.state == UploadTaskState.uploadedConfirming)
                  _ProgressLine(
                    taskId: task.id,
                    confirming:
                        task.state == UploadTaskState.uploadedConfirming,
                  ),
              ],
            ),
          ),
          _TaskActions(task: task),
        ],
      ),
    );
  }

  /// 徽章语义变体（§4 页面 14：进行=主色、等待=琥珀、失败=红、完成=绿、
  /// 取消=灰）。
  static BadgeVariant _badgeVariant(UploadTaskState state) => switch (state) {
    UploadTaskState.preparing ||
    UploadTaskState.uploading ||
    UploadTaskState.uploadedConfirming => BadgeVariant.info,
    UploadTaskState.queued ||
    UploadTaskState.waitingNetwork => BadgeVariant.warning,
    UploadTaskState.preparationFailed ||
    UploadTaskState.retryableFailed => BadgeVariant.error,
    UploadTaskState.completed => BadgeVariant.success,
    UploadTaskState.cancelled => BadgeVariant.neutral,
  };

  /// 徽章文案 = §4.4 界面含义列（确认中不显示「已公开」等超集语义）。
  static String _badgeLabel(AppLocalizations l10n, UploadTaskState state) =>
      switch (state) {
        UploadTaskState.preparing => l10n.queueRowPreparing,
        UploadTaskState.preparationFailed => l10n.uploadsFileUnavailable,
        UploadTaskState.queued => l10n.uploadsWaitingUpload,
        UploadTaskState.uploading => l10n.taskStateUploading,
        UploadTaskState.uploadedConfirming => l10n.uploadsConfirming,
        UploadTaskState.completed => l10n.taskStateCompleted,
        UploadTaskState.waitingNetwork => l10n.uploadsWaitingNetwork,
        UploadTaskState.retryableFailed => l10n.taskStateRetryableFailed,
        UploadTaskState.cancelled => l10n.taskStateCancelled,
      };
}

/// 缩略图：受管副本存在则显示，缺失/已清理/解码失败显示占位图标。
class _Thumb extends StatelessWidget {
  const _Thumb({required this.path});

  final String? path;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    Widget placeholder() => Container(
      width: 48,
      height: 48,
      decoration: BoxDecoration(
        color: theme.colorScheme.surfaceContainerHighest,
        borderRadius: BorderRadius.circular(kRadiusBadge),
      ),
      child: Icon(
        Icons.image_outlined,
        size: 24,
        color: theme.colorScheme.onSurfaceVariant,
      ),
    );
    if (path == null) return placeholder();
    return ClipRRect(
      borderRadius: BorderRadius.circular(kRadiusBadge),
      child: SizedBox(
        width: 48,
        height: 48,
        child: Image.file(
          File(path!),
          fit: BoxFit.cover,
          errorBuilder: (_, _, _) => placeholder(),
        ),
      ),
    );
  }
}

/// 传输进度行：上传中 = 进度总线行级订阅（分数进度条 + 百分比文案）；
/// 确认中 = 不确定进度条（等待服务端核验，不伪造百分比）。
class _ProgressLine extends ConsumerWidget {
  const _ProgressLine({required this.taskId, required this.confirming});

  final String taskId;
  final bool confirming;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    return Padding(
      padding: const EdgeInsets.only(top: 6, right: 8),
      child: StreamBuilder<UploadTaskProgress>(
        stream: ref
            .watch(uploadProgressHubProvider)
            .stream
            .where((p) => p.taskId == taskId),
        builder: (context, snapshot) {
          final fraction = snapshot.data?.fraction;
          return Row(
            children: [
              Expanded(
                child: LinearProgressIndicator(
                  value: confirming ? null : fraction,
                  minHeight: 4,
                ),
              ),
              if (!confirming && fraction != null) ...[
                const SizedBox(width: kSpace8),
                Text(
                  l10n.queueRowUploadingPercent((fraction * 100).round()),
                  style: Theme.of(context).textTheme.labelSmall,
                ),
              ],
            ],
          );
        },
      ),
    );
  }
}

/// 行级动作（按状态；未登录账号缺席时禁用）。
class _TaskActions extends ConsumerWidget {
  const _TaskActions({required this.task});

  final UploadTask task;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final account = ref.watch(sessionAccountProvider).value;
    switch (task.state) {
      // 准备失败重试 = 重新选图（原始源路径不落库，见准备器注释）——
      // 不能普通重试冒充恢复（§4.4）。
      case UploadTaskState.preparationFailed:
        return _RowAction(
          icon: Icons.image_search_outlined,
          label: l10n.uploadsSelectAgain,
          onPressed: account == null
              ? null
              : () => _retryPreparation(context, ref, account),
        );
      case UploadTaskState.retryableFailed:
        return _RowAction(
          icon: Icons.refresh,
          label: l10n.retry,
          onPressed: account == null
              ? null
              : () => ref.read(uploadEngineProvider).retryNow(account, task.id),
        );
      // 网络等待自动恢复，保留手动重试入口（§4.4「保留已有重试」）。
      case UploadTaskState.waitingNetwork:
        return IconButton(
          tooltip: l10n.retry,
          icon: const Icon(Icons.refresh),
          onPressed: account == null
              ? null
              : () => ref.read(uploadEngineProvider).retryNow(account, task.id),
        );
      case UploadTaskState.queued:
      case UploadTaskState.preparing:
        return IconButton(
          tooltip: l10n.cancel,
          icon: const Icon(Icons.close),
          onPressed: account == null
              ? null
              : () => ref.read(uploadEngineProvider).cancel(account, task.id),
        );
      // 终态：移除本机记录（不删云端照片，确认弹窗明确区分）。
      case UploadTaskState.completed:
      case UploadTaskState.cancelled:
        return _RowAction(
          icon: Icons.delete_outline,
          label: l10n.uploadsRemoveRecord,
          foreground: Theme.of(context).colorScheme.onSurfaceVariant,
          onPressed: account == null
              ? null
              : () => _confirmRemoveRecord(context, ref, account),
        );
      case UploadTaskState.uploading:
      case UploadTaskState.uploadedConfirming:
        return const SizedBox(width: 48);
    }
  }

  /// 准备失败重试：重新选图 → preparer.retry（换源重新复制入队）。
  Future<void> _retryPreparation(
    BuildContext context,
    WidgetRef ref,
    String account,
  ) async {
    final l10n = AppLocalizations.of(context);
    final sourcePath = await ref.read(singleImagePickerProvider)();
    if (sourcePath == null || !context.mounted) return;
    final messenger = ScaffoldMessenger.of(context);
    try {
      await ref
          .read(uploadPreparerProvider)
          .retry(accountId: account, taskId: task.id, sourcePath: sourcePath);
    } on Object {
      messenger.showSnackBar(SnackBar(content: Text(l10n.errorGeneric)));
    }
  }

  /// 移除记录确认：明确仅清本机记录、不删 OSS 照片（§4.4）。
  Future<void> _confirmRemoveRecord(
    BuildContext context,
    WidgetRef ref,
    String account,
  ) async {
    final l10n = AppLocalizations.of(context);
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (dialogContext) => AlertDialog(
        title: Text(l10n.queueRemoveRecordTitle),
        content: Text(l10n.queueRemoveRecordBody),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(dialogContext).pop(false),
            child: Text(l10n.cancel),
          ),
          FilledButton(
            onPressed: () => Navigator.of(dialogContext).pop(true),
            child: Text(l10n.uploadsRemoveRecordConfirm),
          ),
        ],
      ),
    );
    if (confirmed != true || !context.mounted) return;
    // 删行 + 尽力删受管副本（行删除后清理执行器不再可见该文件）。
    final store = ref.read(taskStoreProvider);
    await store.delete(task.id);
    if (task.cleanedAt == null) {
      try {
        final file = File(task.sourceFilePath);
        if (await file.exists()) {
          await file.delete();
        }
      } on Object {
        // 文件删除失败接受（无行可追责，残留由用户重装/系统清理回收）。
      }
    }
  }
}

/// 行内文字动作（重新选择/重试/移除记录）：紧凑档，弱化为次级视觉。
class _RowAction extends StatelessWidget {
  const _RowAction({
    required this.icon,
    required this.label,
    required this.onPressed,
    this.foreground,
  });

  final IconData icon;
  final String label;
  final VoidCallback? onPressed;
  final Color? foreground;

  @override
  Widget build(BuildContext context) {
    return TextButton.icon(
      onPressed: onPressed,
      style: TextButton.styleFrom(
        visualDensity: VisualDensity.compact,
        padding: const EdgeInsets.symmetric(horizontal: kSpace8),
        minimumSize: const Size(48, 36),
        foregroundColor:
            foreground ?? Theme.of(context).colorScheme.onSurfaceVariant,
      ),
      icon: Icon(icon, size: 16),
      label: Text(label),
    );
  }
}

/// 底部批量重试条（存在可重试失败任务时出现；仅作用于 retryableFailed，
/// 按钮文案「重试可恢复项」明确范围——§4 页面 15）。
class _BatchRetryBar extends ConsumerWidget {
  const _BatchRetryBar();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    final counts = ref.watch(taskCountsProvider);
    // 标题计数与摘要卡「需关注」同口径（准备失败 + 上传失败）；按钮仅
    // 重试其中的可重试子集，范围文案明确区分（出现条件见 QueueTab）。
    final needsAttention = failedCountOf(counts);
    return Material(
      color: theme.colorScheme.errorContainer,
      child: SafeArea(
        child: Padding(
          padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
          child: Row(
            children: [
              Icon(
                Icons.error_outline,
                color: theme.colorScheme.onErrorContainer,
              ),
              const SizedBox(width: 8),
              Expanded(
                child: Column(
                  // Scaffold 对 bottomNavigationBar 给的是宽松高度约束，
                  // 默认 max 会把整条栏撑到剩余全高、把 body 压成 0；min 使
                  // 栏高 = 两行文字 + 内边距。
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      '${l10n.queueStateNeedsAttention} · $needsAttention',
                      style: theme.textTheme.bodyMedium?.copyWith(
                        color: theme.colorScheme.onErrorContainer,
                      ),
                    ),
                    Text(
                      l10n.uploadsRetryEligibleScope,
                      style: theme.textTheme.bodySmall?.copyWith(
                        color: theme.colorScheme.onErrorContainer,
                      ),
                    ),
                  ],
                ),
              ),
              FilledButton.icon(
                style: FilledButton.styleFrom(
                  backgroundColor: theme.colorScheme.error,
                  foregroundColor: theme.colorScheme.onError,
                ),
                icon: const Icon(Icons.refresh, size: 18),
                label: Text(l10n.uploadsRetryEligible),
                onPressed: () => _retryAll(ref),
              ),
            ],
          ),
        ),
      ),
    );
  }

  /// 全部可重试失败任务（retryableFailed，跨当前筛选）立即重新入队。
  /// 等待网络任务自动恢复、准备失败需换源重选，均不进入批量重试。
  Future<void> _retryAll(WidgetRef ref) async {
    final account = ref.read(sessionAccountProvider).value;
    if (account == null) return;
    final engine = ref.read(uploadEngineProvider);
    final tasks = await ref
        .read(taskStoreProvider)
        .listByAccount(
          account,
          states: const {UploadTaskState.retryableFailed},
        );
    for (final task in tasks) {
      await engine.retryNow(account, task.id);
    }
  }
}