photo-live/apps/mobile/lib/pages/server_history_page.dart

/// 服务端上传历史页（UI-01 §4.4 主题统一，P3 计划 Task 6 / A19 语义）。
///
/// GET /uploads（operationId listUploads）游标分页展示**当前账号跨设备**
/// 的上传会话记录：会话状态 / photo.processingState / sourceDeviceId /
/// 创建时间。页面标题即「服务端历史（跨设备）」，顶部说明条明确「本机
/// 待传队列在上传页」——本机队列是 drift 任务库（TaskStore），两者数据源
/// 与生命周期不同，不合并统计（A19 标注要求）。
///
/// 记录不含 filename（契约 UploadSessionRecord 无该字段），行首展示
/// clientTaskId 前 8 位作识别；sourceDeviceId 与本机 [DeviceId] 一致时
/// 标记「本设备」。
library;

import 'dart:async';

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

import '../core/api_client.dart';
import '../core/app_exception.dart';
import '../core/device_id.dart';
import '../core/error_codes.dart';
import '../core/error_l10n.dart';
import '../features/photos/models.dart';
import '../features/uploads/models.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';

/// 服务端上传历史（从队列页占位入口进入）。
class ServerHistoryPage extends ConsumerStatefulWidget {
  const ServerHistoryPage({super.key});

  @override
  ConsumerState<ServerHistoryPage> createState() => _ServerHistoryPageState();
}

class _ServerHistoryPageState extends ConsumerState<ServerHistoryPage> {
  static const int _pageSize = 20;

  List<UploadSessionRecord> _items = const <UploadSessionRecord>[];
  String? _nextCursor;
  bool _hasMore = false;
  bool _loading = true;
  bool _loadingMore = false;
  String? _errorCode;

  /// 本机设备标识（「本设备」标记比对，A19）。
  String? _ownDeviceId;

  @override
  void initState() {
    super.initState();
    _reload();
    unawaited(
      ref.read(deviceIdProvider).value().then((id) {
        if (mounted) setState(() => _ownDeviceId = id);
      }),
    );
  }

  Future<void> _reload() async {
    setState(() {
      _loading = true;
      _errorCode = null;
    });
    try {
      final page = await ref
          .read(apiClientProvider)
          .listUploads(limit: _pageSize);
      if (mounted) {
        setState(() {
          _items = page.items;
          _nextCursor = page.nextCursor;
          _hasMore = page.hasMore;
          _loading = false;
        });
      }
    } on AppException catch (e) {
      if (mounted) {
        setState(() {
          _errorCode = e.code;
          _loading = false;
        });
      }
    } on Object {
      if (mounted) {
        setState(() {
          _errorCode = ErrorCodes.internalError;
          _loading = false;
        });
      }
    }
  }

  Future<void> _loadMore() async {
    if (_loading || _loadingMore || !_hasMore) return;
    setState(() => _loadingMore = true);
    try {
      final page = await ref.read(apiClientProvider).listUploads(
            cursor: _nextCursor,
            limit: _pageSize,
          );
      if (mounted) {
        setState(() {
          _items = <UploadSessionRecord>[..._items, ...page.items];
          _nextCursor = page.nextCursor;
          _hasMore = page.hasMore;
          _loadingMore = false;
        });
      }
    } on AppException {
      if (mounted) {
        setState(() => _loadingMore = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(
              AppLocalizations.of(context)
                  .messageForErrorCode(ErrorCodes.networkError),
            ),
          ),
        );
      }
    } on Object {
      if (mounted) {
        setState(() => _loadingMore = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(AppLocalizations.of(context).errorGeneric),
          ),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    return Scaffold(
      appBar: AppBar(title: Text(l10n.serverHistoryTitle)),
      body: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          // A19 标注说明条：与「上传」页（本机任务库）的数据源区分。
          Card(
            margin: const EdgeInsets.fromLTRB(kSpace16, kSpace12, kSpace16, 0),
            child: Padding(
              padding: const EdgeInsets.all(kSpace12),
              child: Row(
                children: [
                  Icon(
                    Icons.devices_outlined,
                    size: 18,
                    color: theme.colorScheme.onSurfaceVariant,
                  ),
                  const SizedBox(width: kSpace8),
                  Expanded(
                    child: Text(
                      l10n.serverHistoryBanner,
                      style: theme.textTheme.bodySmall?.copyWith(
                        color: theme.colorScheme.onSurfaceVariant,
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ),
          Expanded(
            child: _loading
                ? const Center(child: CircularProgressIndicator())
                : _errorCode != null
                    ? ErrorState(
                        message: l10n.messageForErrorCode(_errorCode!),
                        onRetry: _reload,
                      )
                    : _items.isEmpty
                        ? EmptyState(
                            icon: Icons.cloud_done_outlined,
                            title: l10n.serverHistoryEmpty,
                          )
                        : ListView.builder(
                            itemCount: _items.length +
                                (_hasMore || _loadingMore ? 1 : 0),
                            itemBuilder: (context, index) {
                              if (index >= _items.length) {
                                return const Padding(
                                  padding: EdgeInsets.symmetric(vertical: 16),
                                  child: Center(
                                    child: SizedBox(
                                      height: 24,
                                      width: 24,
                                      child: CircularProgressIndicator(
                                        strokeWidth: 2,
                                      ),
                                    ),
                                  ),
                                );
                              }
                              if (index >= _items.length - 3 &&
                                  _hasMore &&
                                  !_loadingMore) {
                                WidgetsBinding.instance.addPostFrameCallback(
                                  (_) => _loadMore(),
                                );
                              }
                              return _sessionTile(l10n, theme, _items[index]);
                            },
                          ),
          ),
        ],
      ),
    );
  }

  Widget _sessionTile(
    AppLocalizations l10n,
    ThemeData theme,
    UploadSessionRecord record,
  ) {
    // createdAt 以本机时区展示（记录跨相册，无单一相册时区可依）。
    final local = record.createdAt.toLocal();
    final time = '${local.year}/${local.month}/${local.day} '
        '${local.hour.toString().padLeft(2, '0')}:'
        '${local.minute.toString().padLeft(2, '0')}';
    final deviceShort = record.sourceDeviceId?.substring(0, 8);
    final ownDevice =
        _ownDeviceId != null && record.sourceDeviceId == _ownDeviceId;
    return ListTile(
      leading: const Icon(Icons.cloud_done_outlined),
      title: Text(
        '${record.clientTaskId.substring(0, 8)} · '
        '${(record.expectedBytes / 1024).round()} KB',
        style: theme.textTheme.bodyMedium?.copyWith(
          fontFeatures: const [FontFeature.tabularFigures()],
        ),
      ),
      subtitle: Text(
        deviceShort == null
            ? time
            : '$time · $deviceShort${ownDevice ? '（${l10n.thisDevice}）' : ''}',
      ),
      trailing: Wrap(
        spacing: 6,
        runSpacing: 4,
        crossAxisAlignment: WrapCrossAlignment.center,
        children: [
          StateBadge(
            compact: true,
            variant: switch (record.state) {
              UploadSessionState.confirmed => BadgeVariant.success,
              UploadSessionState.pending => BadgeVariant.info,
              UploadSessionState.cancelled ||
              UploadSessionState.expired => BadgeVariant.neutral,
            },
            label: _sessionStateLabel(l10n, record.state),
          ),
          StateBadge(
            compact: true,
            variant: switch (record.photo.processingState) {
              PhotoProcessingState.ready => BadgeVariant.success,
              PhotoProcessingState.processing ||
              PhotoProcessingState.uploaded => BadgeVariant.info,
              PhotoProcessingState.pendingUpload => BadgeVariant.warning,
              PhotoProcessingState.processingFailed => BadgeVariant.error,
            },
            label: _processingLabel(l10n, record.photo.processingState),
          ),
        ],
      ),
    );
  }

  static String _sessionStateLabel(
    AppLocalizations l10n,
    UploadSessionState state,
  ) {
    switch (state) {
      case UploadSessionState.pending:
        return l10n.uploadStatePending;
      case UploadSessionState.confirmed:
        return l10n.uploadStateConfirmed;
      case UploadSessionState.cancelled:
        return l10n.uploadStateCancelled;
      case UploadSessionState.expired:
        return l10n.uploadStateExpired;
    }
  }

  static String _processingLabel(
    AppLocalizations l10n,
    PhotoProcessingState s,
  ) {
    switch (s) {
      case PhotoProcessingState.pendingUpload:
        return l10n.procPendingUpload;
      case PhotoProcessingState.uploaded:
        return l10n.procUploaded;
      case PhotoProcessingState.processing:
        return l10n.procProcessing;
      case PhotoProcessingState.ready:
        return l10n.procReady;
      case PhotoProcessingState.processingFailed:
        return l10n.procProcessingFailed;
    }
  }
}