using Godot;
using System;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Web;
using BITKit;
using BITKit.Auth;
using BITKit.Net.Http;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Newtonsoft.Json;
using Environment = System.Environment;
using HttpClient = System.Net.Http.HttpClient;

namespace IDIS.License;

public class LicenseBin
{
	public DateTime ExpirationDate=DateTime.Now;
	public string Token;
}
public partial class LicenseService : EntityComponent,IAuthService
{
	private static readonly HttpClient _httpClient = new();
	[Export] private string _requestAuthorizeUrl;
	[Export] private string _revokeAuthorizeUrl;
	public bool IsAuthorized { get;private set; }
	public bool IsAuthorizing { get;private set; }

	public event Action<string> OnAuthorize;
	public event Action<string> OnAuthorized;
	public event Action<string> UnAuthorize;
	public event Action<string> OnAuthorizeFailure;
	
	private CancellationTokenSource _cancellationTokenSource;
	private CancellationToken _cancellationToken=>_cancellationTokenSource.Token;
	private IHttpListenerService _httpListenerService;
	private readonly string path = Path.Combine(
		Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
		"iFactory",
		"License.bin"
	);

	public override void BuildService(IServiceCollection serviceCollection)
	{
		serviceCollection.AddSingleton<IAuthService>(this);
	}

	public override void _EnterTree()
	{
		_cancellationTokenSource = new CancellationTokenSource();
	}
	public override void _ExitTree()
	{
		_cancellationTokenSource.Cancel();
	}
	public override void OnAwake()
	{
		_httpListenerService = Entity.ServiceProvider.GetRequiredService<IHttpListenerService>();
		_httpListenerService.OnRequest += OnRequest;
	}

	public override void OnStart()
	{
		BIT4Log.Log<LicenseService>("准备文件中,二进制授权文件路径:"+path);
		if (IsAuthorized || IsAuthorizing) return;
		if (File.Exists(path) is false) return;
		var json = File.ReadAllText(path);
		var licenseBin = JsonConvert.DeserializeObject<LicenseBin>(json);
		if(licenseBin.ExpirationDate<DateTime.Now) return;
		AuthorizeAsync(licenseBin.Token).Forget();
	}

	private HttpContent OnRequest(HttpListenerRequest arg)
	{
		var token = arg.RawUrl!.Split('/').Last();
		AuthorizeAsync(token).Forget();
		return new StringContent("success");
	}

	public async UniTask AuthorizeAsync(string token)
	{
		var rawToken = token;
		OnAuthorize?.Invoke(token);
		token = JsonConvert.SerializeObject(token);
		var response = await _httpClient.PostAsync(_requestAuthorizeUrl,new StringContent( token,Encoding.UTF8, "application/json"), _cancellationToken);
		var message = await response.Content.ReadAsStringAsync(_cancellationToken);
		if (response.IsSuccessStatusCode)
		{
			OnAuthorized?.Invoke(message);
			BIT4Log.Log<IAuthService>($"授权成功:{message}");
			var licenseBin = new LicenseBin
			{
				Token = rawToken,
				ExpirationDate = DateTime.Now.AddDays(7)
			};
			PathHelper.EnsureDirectoryCreated(path);
			await File.WriteAllTextAsync(path, JsonConvert.SerializeObject(licenseBin), _cancellationToken);
			IsAuthorized = true;
		}
		else
		{
			OnAuthorizeFailure?.Invoke(message);
			BIT4Log.Log<IAuthService>($"当前Token:{rawToken}");
			BIT4Log.Log<IAuthService>($"授权失败:{message}");
		}
	}

	public UniTask CancelAuthorizationAsync()
	{
		if (IsAuthorized is false)
		{
			throw new InvalidOperationException("未授权");
		}
		var url = _revokeAuthorizeUrl.Replace("{x}",_requestAuthorizeUrl);
		UnAuthorize?.Invoke("取消授权");
		IsAuthorized = false;
		_httpClient.PostAsync(url, new StringContent(""), _cancellationToken).AsUniTask().Forget();
		return UniTask.CompletedTask;
	}

}