using GoodBooks.PAY.PAYBLL.Abstractions;
using GoodBooks.PAY.PAYBLL.Providers;
using Microsoft.Extensions.Logging;

namespace GoodBooks.PAY.PAYBLL.Factory
{
    /// <summary>
    /// Resolves IPaymentGateway by gateway code using a switch expression.
    /// Follows the ComplianceAdapterFactory pattern — no keyed DI.
    /// Registered as Singleton (stateless) in Program.cs.
    ///
    /// HttpClient instances are created fresh per call via IHttpClientFactory to
    /// ensure thread-safety and correct header isolation between concurrent requests.
    /// </summary>
    public sealed class PaymentGatewayFactory : IPaymentGatewayFactory
    {
        private readonly IHttpClientFactory   _httpFactory;
        private readonly ILoggerFactory       _loggerFactory;

        public PaymentGatewayFactory(IHttpClientFactory httpFactory, ILoggerFactory loggerFactory)
        {
            _httpFactory    = httpFactory;
            _loggerFactory  = loggerFactory;
        }

        public IPaymentGateway GetGateway(string gatewayCode) =>
            gatewayCode.ToUpperInvariant() switch
            {
                "RAZORPAY" => new RazorpayGateway(
                                  _httpFactory.CreateClient("Razorpay"),
                                  _loggerFactory.CreateLogger<RazorpayGateway>()),

                "STRIPE"   => new StripeGateway(
                                  _httpFactory.CreateClient("Stripe"),
                                  _loggerFactory.CreateLogger<StripeGateway>()),

                "CASHFREE" => new CashfreeGateway(
                                  _httpFactory.CreateClient("Cashfree"),
                                  _loggerFactory.CreateLogger<CashfreeGateway>()),

                _ => throw new NotSupportedException(
                         $"Payment gateway '{gatewayCode}' is not supported. " +
                         $"Supported gateways: RAZORPAY, STRIPE, CASHFREE.")
            };
    }
}