using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Options;
using ZB.MOM.WW.Auth.Abstractions.ApiKeys;

namespace ZB.MOM.WW.Auth.ApiKeys.DependencyInjection;

/// <summary>
/// Runs the registered <see cref="IApiKeyStoreMigrator"/> at application startup when
/// <see cref="ApiKeyOptions.RunMigrationsOnStartup"/> is <see langword="true"/>. The migrator
/// registered in DI is whichever store provider's implementation won the <c>TryAdd</c> race —
/// SQLite by default, or a provider package (e.g. SQL Server) registered before
/// <c>AddZbApiKeyAuth</c>. The migration is idempotent, so repeated restarts are safe.
/// </summary>
internal sealed class ApiKeyMigrationHostedService(
    IApiKeyStoreMigrator migrator,
    IOptions<ApiKeyOptions> options) : IHostedService
{
    /// <inheritdoc />
    public async Task StartAsync(CancellationToken cancellationToken)
    {
        if (options.Value.RunMigrationsOnStartup)
        {
            await migrator.MigrateAsync(cancellationToken).ConfigureAwait(false);
        }
    }

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