using Connected.Middleware;
using Connected.Startup;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Microsoft.Extensions.DependencyInjection;

namespace Connected;

public static class Instance
{
	public static WebAssemblyHost Host { get; private set; } = default!;
	private static IServiceProvider ServiceProvider { get; set; } = default!;

	internal static T? GetService<T>()
	{
		return ServiceProvider.GetService<T>();
	}
	public static async Task Start<TApp>(List<IStartup> startups, Dictionary<string, string> args) where TApp : IComponent
	{
		var builder = WebAssemblyHostBuilder.CreateDefault(UnpackArguments(args));

		builder.RootComponents.Add<TApp>("#app");
		builder.RootComponents.Add<HeadOutlet>("head::after");

		builder.Services.AddHttpClient();

		builder.Services.AddSingleton(typeof(IComponentMiddlewareService), typeof(ComponentMiddlewareService));
		builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

		foreach (var startup in startups)
			await startup.ConfigureServices(builder.Services);

		Host = builder.Build();

		foreach (var startup in startups)
			await startup.Configure(Host);

		await Host.RunAsync();
	}

	private static string[] UnpackArguments(Dictionary<string, string> args)
	{
		var result = new string[args.Count];

		for (var i = 0; i < args.Count; i++)
		{
			var arg = args.ElementAt(i);

			result[i] = string.IsNullOrWhiteSpace(arg.Value) ? arg.Key : $"{arg.Key}={arg.Value}";
		}

		return result;
	}

	public static void UseMiddlewareComponent<TMiddleware, TComponent>(this WebAssemblyHost app)
	{
		if (app.Services.GetService<IComponentMiddlewareService>() is not IComponentMiddlewareService service)
			throw new NullReferenceException(nameof(IComponentMiddlewareService));

		service.Add<TMiddleware, TComponent>();
	}
}