using Hangfire;
using Masuit.MyBlogs.Core.Configs;
using Masuit.Tools.Html;
using Masuit.Tools.Logging;
using System.Net.Http.Headers;
using System.Text.RegularExpressions;
using System.Web;

namespace Masuit.MyBlogs.Core.Common
{
	/// <summary>
	/// 图床客户端
	/// </summary>
	public sealed class ImagebedClient
	{
		private readonly HttpClient _httpClient;
		private readonly IConfiguration _config;

		/// <summary>
		/// 图床客户端
		/// </summary>
		/// <param name="httpClient"></param>
		/// <param name="config"></param>
		public ImagebedClient(HttpClient httpClient, IConfiguration config)
		{
			_config = config;
			_httpClient = httpClient;
		}

		private readonly List<string> _failedList = new();

		/// <summary>
		/// 上传图片
		/// </summary>
		/// <param name="stream"></param>
		/// <param name="file"></param>
		/// <returns></returns>
		public Task<(string url, bool success)> UploadImage(Stream stream, string file, CancellationToken cancellationToken)
		{
			if (stream.Length < 51200)
			{
				return Task.FromResult<(string, bool)>((null, false));
			}

			file = Regex.Replace(Path.GetFileName(file), @"\p{P}|\p{S}", "");
			var gitlabs = AppConfig.GitlabConfigs.Where(c => c.FileLimitSize >= stream.Length && !_failedList.Contains(c.ApiUrl)).OrderByRandom().ToList();
			if (gitlabs.Count > 0)
			{
				var gitlab = gitlabs[0];
				if (gitlab.ApiUrl.Contains("api.github.com"))
				{
					return UploadGithub(gitlab, stream, file, cancellationToken);
				}

				return UploadGitlab(gitlab, stream, file, cancellationToken);
			}

			return Task.FromResult<(string, bool)>((null, false));
		}

		/// <summary>
		/// github图床
		/// </summary>
		/// <param name="config"></param>
		/// <param name="stream"></param>
		/// <param name="file"></param>
		/// <returns></returns>
		private Task<(string url, bool success)> UploadGithub(GitlabConfig config, Stream stream, string file, CancellationToken cancellationToken)
		{
			var path = $"{DateTime.Now:yyyy\\/MM\\/dd}/{file}";
			_httpClient.DefaultRequestHeaders.UserAgent.Add(ProductInfoHeaderValue.Parse("Awesome-Octocat-App"));
			_httpClient.DefaultRequestHeaders.Authorization = AuthenticationHeaderValue.Parse("token " + config.AccessToken);
			return _httpClient.PutAsJsonAsync(config.ApiUrl + HttpUtility.UrlEncode(path), new
			{
				message = SnowFlake.NewId,
				committer = new
				{
					name = SnowFlake.NewId,
					email = "1@1.cn"
				},
				content = Convert.ToBase64String(stream.ToArray())
			}, cancellationToken).ContinueWith(t =>
			{
				if (t.IsCompletedSuccessfully)
				{
					using var resp = t.Result;
					using var content = resp.Content;
					if (resp.IsSuccessStatusCode)
					{
						return (config.RawUrl.Split(',').OrderByRandom().FirstOrDefault() + path, true);
					}
				}

				LogManager.Info("图片上传到gitee失败。");
				return (null, false);
			});
		}

		/// <summary>
		/// github图床
		/// </summary>
		/// <param name="config"></param>
		/// <param name="stream"></param>
		/// <param name="file"></param>
		/// <returns></returns>
		private Task<(string url, bool success)> UploadGitlab(GitlabConfig config, Stream stream, string file, CancellationToken cancellationToken)
		{
			var path = $"{DateTime.Now:yyyy\\/MM\\/dd}/{file}";
			_httpClient.DefaultRequestHeaders.Add("PRIVATE-TOKEN", config.AccessToken);
			return _httpClient.PostAsJsonAsync(config.ApiUrl.Contains("/v3/") ? config.ApiUrl : config.ApiUrl + HttpUtility.UrlEncode(path), new
			{
				file_path = path,
				branch_name = config.Branch,
				branch = config.Branch,
				author_email = CommonHelper.SystemSettings["ReceiveEmail"],
				author_name = SnowFlake.NewId,
				encoding = "base64",
				content = Convert.ToBase64String(stream.ToArray()),
				commit_message = SnowFlake.NewId
			}, cancellationToken).ContinueWith(t =>
			{
				if (t.IsCompletedSuccessfully)
				{
					using var resp = t.Result;
					using var content = resp.Content;
					if (resp.IsSuccessStatusCode || content.ReadAsStringAsync().Result.Contains("already exists"))
					{
						return (config.RawUrl + path, true);
					}
				}

				LogManager.Info($"图片上传到gitlab({config.ApiUrl})失败。");
				_failedList.Add(config.ApiUrl);
				return (null, false);
			});
		}

		/// <summary>
		/// 替换img标签的src属性
		/// </summary>
		/// <param name="content"></param>
		/// <returns></returns>
		public async Task<string> ReplaceImgSrc(string content, CancellationToken cancellationToken)
		{
			if (bool.TryParse(_config["Imgbed:EnableLocalStorage"], out var b) && b)
			{
				return content;
			}

			var srcs = content.MatchImgSrcs();
			foreach (var src in srcs)
			{
				if (src.StartsWith("http"))
				{
					continue;
				}

				var path = Path.Combine(AppContext.BaseDirectory + "wwwroot", src.Replace("/", @"\")[1..]);
				if (!File.Exists(path))
				{
					continue;
				}

				await using var stream = File.OpenRead(path);
				var (url, success) = await UploadImage(stream, path, cancellationToken);
				if (success)
				{
					content = content.Replace(src, url);
					BackgroundJob.Enqueue(() => File.Delete(path));
				}
			}

			return content;
		}
	}
}