using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace StellaOps.Notifier.Worker.Escalation;

/// <summary>
/// Extension methods for registering escalation services.
/// </summary>
public static class EscalationServiceExtensions
{
    /// <summary>
    /// Adds escalation and on-call services.
    /// </summary>
    public static IServiceCollection AddEscalationServices(
        this IServiceCollection services,
        IConfiguration configuration)
    {
        // Core services
        services.AddSingleton<IEscalationPolicyService, InMemoryEscalationPolicyService>();
        services.AddSingleton<IOnCallScheduleService, InMemoryOnCallScheduleService>();
        services.AddSingleton<IEscalationEngine, EscalationEngine>();

        // Ack bridge
        services.Configure<AckBridgeOptions>(configuration.GetSection(AckBridgeOptions.SectionName));
        services.AddSingleton<IAckBridge, AckBridge>();

        // Inbox channels
        services.AddSingleton<InAppInboxChannel>();
        services.AddSingleton<CliNotificationChannel>();
        services.AddSingleton<IInboxChannel>(sp => sp.GetRequiredService<InAppInboxChannel>());

        return services;
    }

    /// <summary>
    /// Adds PagerDuty integration.
    /// </summary>
    public static IServiceCollection AddPagerDutyIntegration(
        this IServiceCollection services,
        IConfiguration configuration)
    {
        services.Configure<PagerDutyOptions>(configuration.GetSection(PagerDutyOptions.SectionName));
        services.AddHttpClient<PagerDutyAdapter>();
        services.AddSingleton<IExternalIntegrationAdapter, PagerDutyAdapter>(sp =>
            sp.GetRequiredService<PagerDutyAdapter>());

        return services;
    }

    /// <summary>
    /// Adds OpsGenie integration.
    /// </summary>
    public static IServiceCollection AddOpsGenieIntegration(
        this IServiceCollection services,
        IConfiguration configuration)
    {
        services.Configure<OpsGenieOptions>(configuration.GetSection(OpsGenieOptions.SectionName));
        services.AddHttpClient<OpsGenieAdapter>();
        services.AddSingleton<IExternalIntegrationAdapter, OpsGenieAdapter>(sp =>
            sp.GetRequiredService<OpsGenieAdapter>());

        return services;
    }
}