using Microsoft.Extensions.Options;

namespace ECMJobRunner.WebCron.ProfileWorker;

public static class DependencyInjection
{
    public static IServiceCollection AddProfileWorker(this IServiceCollection services, IConfiguration configuration)
    {
        // Configure ProfileWorker options from appsettings.json
        services.Configure<ProfileWorkerOptions>(
            configuration.GetSection(ProfileWorkerOptions.SectionName));

        // Validate options at startup
        services.AddSingleton<IValidateOptions<ProfileWorkerOptions>, ProfileWorkerOptionsValidator>();

        services.AddHostedService<ProfileWorker>();
        services.AddSingleton<ProfileCache>();
        services.AddScoped<ProfileWork>();
        return services;
    }
}

/// <summary>
/// Validates ProfileWorkerOptions configuration at startup.
/// </summary>
internal class ProfileWorkerOptionsValidator : IValidateOptions<ProfileWorkerOptions>
{
    public ValidateOptionsResult Validate(string? name, ProfileWorkerOptions options)
    {
        if (options.IntervalMS <= 0)
        {
            return ValidateOptionsResult.Fail("ProfileWorker:IntervalMs must be greater than 0");
        }

        if (options.IntervalMS < 100)
        {
            return ValidateOptionsResult.Fail("ProfileWorker:IntervalMs should be at least 100ms to avoid excessive CPU usage");
        }

        return ValidateOptionsResult.Success;
    }
}