using JobEngineBLL.Interfaces;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace JobEngineSL.Services;

// Loads all active Quartz jobs from MJOBDEFINE on application startup.
// Using IHostedService.StartAsync keeps startup fully async — no sync-over-async deadlock risk.
internal sealed class JobEngineStartupService : IHostedService
{
    private readonly IQuartzSyncService          _syncService;
    private readonly ILogger<JobEngineStartupService> _logger;

    public JobEngineStartupService(IQuartzSyncService syncService, ILogger<JobEngineStartupService> logger)
    {
        _syncService = syncService;
        _logger      = logger;
    }

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        try
        {
            await _syncService.LoadAllJobsAsync(cancellationToken).ConfigureAwait(false);
        }
        catch (Exception ex) when (ex is not OperationCanceledException)
        {
            // Log but do not crash the host — scheduler starts empty; jobs will be loaded on next sync
            _logger.LogError(ex, "JobEngine: failed to load Quartz jobs at startup — running with empty scheduler");
        }
    }

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