using System;
using System.Threading.Tasks;
using System.CommandLine;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.EntityFrameworkCore;
using NLog.Extensions.Logging;

using Selector.Extensions;
using Selector.Model;
using Selector.Cache;
using Selector.Cache.Extensions;
using Selector.Events;
using Selector.Model.Services;

namespace Selector.CLI
{
    public static class Program
    {
        public static async Task Main(string[] args)
        {
            var cmd = new RootCommand {
                new Command("start") {

                }
            };

            CreateHostBuilder(args, ConfigureDefault, ConfigureDefaultNlog).Build().Run();
        }

        public static RootOptions ConfigureOptions(HostBuilderContext context, IServiceCollection services)
        {
            services.Configure<RootOptions>(options =>
            {
                OptionsHelper.ConfigureOptions(options, context.Configuration);
            });

            var config = OptionsHelper.ConfigureOptions(context.Configuration);

            services.Configure<SpotifyAppCredentials>(options =>
            {
                options.ClientId = config.ClientId;
                options.ClientSecret = config.ClientSecret;
            });            

            return config;
        }

        public static void ConfigureLastFm(RootOptions config, IServiceCollection services)
        {
            if(config.LastfmClient is not null)
            {
                Console.WriteLine("> Adding Last.fm credentials...");

                services.AddLastFm(config.LastfmClient, config.LastfmSecret);
                
                if(config.RedisOptions.Enabled)
                {
                    Console.WriteLine("> Adding caching Last.fm consumers...");
                    services.AddCachingLastFm();
                }
            }
            else 
            {
                Console.WriteLine("> No Last.fm credentials, skipping init...");
            }
        }

        public static void ConfigureDb(RootOptions config, IServiceCollection services)
        {
            if (config.DatabaseOptions.Enabled)
            {
                Console.WriteLine("> Adding Databse Context...");
                services.AddDbContext<ApplicationDbContext>(options =>
                    options.UseNpgsql(config.DatabaseOptions.ConnectionString)
                );

                services.AddHostedService<MigratorService>();
            }
        }

        public static void ConfigureEqual(RootOptions config, IServiceCollection services)
        {
            switch (config.Equality)
            {
                case EqualityChecker.Uri:
                    Console.WriteLine("> Using Uri Equality");
                    services.AddSingleton<IEqual, UriEqual>();
                    break;
                case EqualityChecker.String:
                    Console.WriteLine("> Using String Equality");
                    services.AddSingleton<IEqual, StringEqual>();
                    break;
            }
        }

        public static void ConfigureDefault(HostBuilderContext context, IServiceCollection services)
        {
            Console.WriteLine("~~~ Selector CLI ~~~");
            Console.WriteLine();

            Console.WriteLine("> Configuring...");
            // CONFIG
            var config = ConfigureOptions(context, services);
            services.AddHttpClient();

            Console.WriteLine("> Adding Services...");
            // SERVICES
            services.AddConsumerFactories();
            if (config.RedisOptions.Enabled)
            {
                Console.WriteLine("> Adding caching consumers...");
                services.AddCachingConsumerFactories();
            }
            services.AddWatcher();

            services.AddEvents();

            services.AddSpotify();
            ConfigureLastFm(config, services);
            ConfigureDb(config, services);
            ConfigureEqual(config, services);

            if (config.RedisOptions.Enabled)
            {
                Console.WriteLine("> Adding Redis...");
                services.AddRedisServices(config.RedisOptions.ConnectionString);

                Console.WriteLine("> Adding cache event maps...");
                services.AddTransient<IEventMapping, FromPubSub.SpotifyLink>();
                services.AddTransient<IEventMapping, FromPubSub.Lastfm>();

                Console.WriteLine("> Adding caching Spotify consumers...");
                services.AddCachingSpotify();
            }

            // HOSTED SERVICES
            if (config.WatcherOptions.Enabled)
            {
                if(config.WatcherOptions.LocalEnabled)
                {
                    Console.WriteLine("> Adding Local Watcher Service");
                    services.AddHostedService<LocalWatcherService>();
                }

                if(config.DatabaseOptions.Enabled)
                {
                    Console.WriteLine("> Adding Db Watcher Service");
                    services.AddHostedService<DbWatcherService>();
                }
            }
        }

        public static void ConfigureDefaultNlog(HostBuilderContext context, ILoggingBuilder builder)
        {
            builder.ClearProviders();
            builder.SetMinimumLevel(LogLevel.Trace);
            builder.AddNLog(context.Configuration);
        }

        static IHostBuilder CreateHostBuilder(string[] args, Action<HostBuilderContext, IServiceCollection> BuildServices, Action<HostBuilderContext, ILoggingBuilder> BuildLogs)
            => Host.CreateDefaultBuilder(args)
                .UseWindowsService()
                .UseSystemd()
                .ConfigureServices((context, services) => BuildServices(context, services))
                .ConfigureLogging((context, builder) => BuildLogs(context, builder));
    }
}