using Core.Blueprint.Caching.Adapters;
using Core.Blueprint.Caching.Contracts;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Core.Blueprint.Caching.Configuration
{
    /// <summary>
    /// Provides extension methods for registering Redis-related services in the DI container.
    /// </summary>
    public static class RegisterBlueprint
    {
        /// <summary>
        /// Adds Redis caching services to the service collection.
        /// </summary>
        /// <param name="services">The service collection to register the services into.</param>
        /// <param name="configuration">The application configuration object.</param>
        /// <returns>The updated service collection.</returns>
        public static IServiceCollection AddRedis(this IServiceCollection services, IConfiguration configuration)
        {
            // TODO for the following variable we'll need to add in the appsettings.json the following config: "UseRedisCache": true,
            bool useRedis = configuration.GetValue<bool>("UseRedisCache");
            //TODO decide wheter to use appsettings or the following ENV variable
            useRedis = Environment.GetEnvironmentVariable("CORE_BLUEPRINT_PACKAGES_USE_REDIS")?.ToLower() == "true";

            if (useRedis)
            {
                var redisConnectionString = configuration.GetSection("ConnectionStrings:Redis").Value;
                if (string.IsNullOrEmpty(redisConnectionString))
                {
                    throw new InvalidOperationException("Redis connection is not configured.");
                }

                services.AddSingleton<ICacheProvider>(provider =>
                    new RedisCacheProvider(redisConnectionString, provider.GetRequiredService<ILogger<RedisCacheProvider>>()));
            }
            else
            {
                services.AddMemoryCache();
                services.AddSingleton<ICacheProvider, MemoryCacheProvider>();
            }

            var cacheSettings = configuration.GetSection("CacheSettings").Get<CacheSettings>();
            if (cacheSettings == null)
            {
                throw new InvalidOperationException("CacheSettings section is not configured.");
            }
            services.AddSingleton<ICacheSettings>(cacheSettings);

            return services;
        }
    }
}