using Microsoft.Extensions.Hosting;

namespace Monitor.Backend.Application;

/// <summary>
/// 启动时最先执行：截断没有索引记录的段文件尾部、创建初始管理员、创建默认的线路任务模板。
/// 宿主按注册顺序依次等待各个 IHostedService 启动，所以它需要最先注册。
/// </summary>
public sealed class StartupTasks : IHostedService
{
    private readonly IRawStore _raw;
    private readonly AuthService _auth;
    private readonly TaskService _tasks;

    public StartupTasks(IRawStore raw, AuthService auth, TaskService tasks)
    {
        _raw = raw;
        _auth = auth;
        _tasks = tasks;
    }

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        await _raw.RecoverAsync(cancellationToken);
        await _auth.EnsureInitialAdminAsync(cancellationToken);
        await _tasks.SeedDefaultsAsync(cancellationToken);
    }

    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
}