using JdeScoping.DataSync;
using JdeScoping.DataSync.Options;
using JdeScoping.DataSync.Contracts;
using JdeScoping.DataSync.HealthChecks;
using JdeScoping.DataSync.Services;
using JdeScoping.DataSync.Telemetry;
using Microsoft.Extensions.Configuration;

namespace Microsoft.Extensions.DependencyInjection;

/// <summary>
/// Extension methods for registering data sync services.
/// </summary>
public static class DataSyncDependencyInjection
{
    /// <summary>
    /// Adds data synchronization services to the service collection.
    /// </summary>
    /// <param name="services">The service collection.</param>
    /// <param name="configuration">The configuration.</param>
    /// <returns>The service collection for chaining.</returns>
    public static IServiceCollection AddDataSyncServices(
        this IServiceCollection services,
        IConfiguration configuration)
    {
        // Bind configuration with validation
        services.AddOptions<DataSyncOptions>()
            .Bind(configuration.GetSection(DataSyncOptions.SectionName))
            .ValidateDataAnnotations()
            .ValidateOnStart();

        // Pipeline configuration (new ETL infrastructure)
        services.AddOptions<PipelineOptions>()
            .Bind(configuration.GetSection(PipelineOptions.SectionName));

        // Pipeline factory (new ETL infrastructure)
        services.AddSingleton<IEtlPipelineFactory, EtlPipelineFactory>();

        // Register hosted service
        services.AddHostedService<DataSyncService>();

        // Register core services as scoped (for parallel isolation)
        services.AddScoped<ISyncOrchestrator, SyncOrchestrator>();
        services.AddScoped<IScheduleChecker, ScheduleChecker>();
        services.AddScoped<ITableSyncOperation, TableSyncOperation>();
        services.AddScoped<IDataUpdateRepository, DataUpdateRepository>();

        // Register health check
        services.AddHealthChecks()
            .AddCheck<DataSyncHealthCheck>("data-sync", tags: ["datasync", "background"]);

        // Register metrics as singleton
        services.AddSingleton<DataSyncMetrics>();

        return services;
    }
}