using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using ViewEngine.Client.Configuration;

namespace ViewEngine.Client.Extensions;

/// <summary>
/// Extension methods for registering ViewEngine client services
/// </summary>
public static class ServiceCollectionExtensions
{
    /// <summary>
    /// Adds ViewEngine client services to the dependency injection container
    /// </summary>
    /// <param name="services">The service collection</param>
    /// <param name="configuration">The configuration</param>
    /// <returns>The service collection for chaining</returns>
    public static IServiceCollection AddViewEngineClient(this IServiceCollection services, IConfiguration configuration)
    {
        // Bind configuration
        services.Configure<ViewEngineOptions>(configuration.GetSection(ViewEngineOptions.SectionName));

        // Register the client as a typed HttpClient
        services.AddHttpClient<ViewEngineClient>((serviceProvider, httpClient) =>
        {
            var options = configuration.GetSection(ViewEngineOptions.SectionName).Get<ViewEngineOptions>()
                ?? throw new InvalidOperationException("ViewEngine configuration is missing");

            if (string.IsNullOrWhiteSpace(options.ApiKey))
                throw new InvalidOperationException("ViewEngine API key is required");

            httpClient.BaseAddress = new Uri(options.BaseUrl);
            httpClient.Timeout = TimeSpan.FromSeconds(options.TimeoutSeconds);
            httpClient.DefaultRequestHeaders.Add("X-API-Key", options.ApiKey);
        });

        return services;
    }

    /// <summary>
    /// Adds ViewEngine client services to the dependency injection container with custom configuration
    /// </summary>
    /// <param name="services">The service collection</param>
    /// <param name="configureOptions">Action to configure options</param>
    /// <returns>The service collection for chaining</returns>
    public static IServiceCollection AddViewEngineClient(this IServiceCollection services, Action<ViewEngineOptions> configureOptions)
    {
        // Configure options
        services.Configure(configureOptions);

        // Register the client as a typed HttpClient
        services.AddHttpClient<ViewEngineClient>((serviceProvider, httpClient) =>
        {
            var options = new ViewEngineOptions();
            configureOptions(options);

            if (string.IsNullOrWhiteSpace(options.ApiKey))
                throw new InvalidOperationException("ViewEngine API key is required");

            httpClient.BaseAddress = new Uri(options.BaseUrl);
            httpClient.Timeout = TimeSpan.FromSeconds(options.TimeoutSeconds);
            httpClient.DefaultRequestHeaders.Add("X-API-Key", options.ApiKey);
        });

        return services;
    }
}