// Author: fruit.com.cn

import 'dart:async';

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

import '../../l10n/app_localizations.dart';
import '../data/services/download_controller.dart';
import '../platform/haptics.dart';
import 'auth_gate.dart';

/// 详情页与播放页共用的下载授权入口。
///
/// 未登录先走登录闸；业务拒绝时直接展示后端 message。
Future<void> requestEpisodeDownload(
  BuildContext context,
  String episodeId,
) async {
  if (!await ensureSignedIn(context)) return;
  if (!context.mounted) return;
  unawaited(context.read<Haptics>().lightImpact());
  final downloads = context.read<DownloadController>();
  final result = await downloads.grant(episodeId);
  if (!context.mounted) return;
  final l10n = AppLocalizations.of(context)!;
  final hasBackendMessage = result.message?.trim().isNotEmpty ?? false;
  if (result.ok) {
    unawaited(
      downloads.startDownload(episodeId, license: result.license),
    );
  }
  final message = result.ok
      ? l10n.downloadGranted
      : hasBackendMessage
      ? result.message!
      : l10n.downloadGrantFailed;
  ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));
}