using FreeRedis;
using Hangfire;
using Masuit.MyBlogs.Core.Common;
using Masuit.MyBlogs.Core.Configs;
using Masuit.MyBlogs.Core.Extensions.Firewall;
using Masuit.Tools.AspNetCore.Mime;
using Masuit.Tools.Core.Validator;
using Masuit.Tools.Logging;
using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Net.Http.Headers;
using System.Diagnostics;
using System.Text;
using System.Web;
using SameSiteMode = Microsoft.AspNetCore.Http.SameSiteMode;

namespace Masuit.MyBlogs.Core.Controllers;

/// <summary>
/// 错误页
/// </summary>
[ApiExplorerSettings(IgnoreApi = true)]
public sealed class ErrorController : Controller
{
	public IRedisClient RedisClient { get; set; }

	/// <summary>
	/// 404
	/// </summary>
	/// <returns></returns>
	[Route("error"), Route("{*url}", Order = 99999), ResponseCache(Duration = 36000)]
	public ActionResult Index()
	{
		Response.StatusCode = 404;
		string accept = Request.Headers[HeaderNames.Accept] + "";
		return true switch
		{
			_ when accept.StartsWith("image") => File("/Assets/images/404/4044.jpg", ContentType.Jpeg),
			_ when Request.HasJsonContentType() || Request.Method == HttpMethods.Post => Json(new
			{
				StatusCode = 404,
				Success = false,
				Message = "页面未找到！"
			}),
			_ => View("Index")
		};
	}

	/// <summary>
	/// 503
	/// </summary>
	/// <returns></returns>
	[Route("ServiceUnavailable")]
	public async Task<ActionResult> ServiceUnavailable()
	{
		var feature = HttpContext.Features.Get<IExceptionHandlerPathFeature>();
		if (feature != null)
		{
			string err;
			var ip = HttpContext.Connection.RemoteIpAddress;
			switch (feature.Error)
			{
				case DbUpdateConcurrencyException ex:
					err = $"数据库并发更新异常，更新表：{ex.Entries.Select(e => e.Metadata.Name)}，请求路径({Request.Method})：{Request.Scheme}://{Request.Host}{HttpUtility.UrlDecode(feature.Path)}{Request.QueryString}，客户端用户代理：{Request.Headers[HeaderNames.UserAgent]}，客户端IP：{ip}\t{ex.InnerException?.Message}，请求参数：\n{await GetRequestBody(Request)}\n堆栈信息：";
					LogManager.Error(err, ex.Demystify());
					break;

				case DbUpdateException ex:
					err = $"数据库更新时异常，更新表：{ex.Entries.Select(e => e.Metadata.Name)}，请求路径({Request.Method})：{Request.Scheme}://{Request.Host}{HttpUtility.UrlDecode(feature.Path)}{Request.QueryString} ，客户端用户代理：{Request.Headers[HeaderNames.UserAgent]}，客户端IP：{ip}\t{ex.InnerException?.Message}，请求参数：\n{await GetRequestBody(Request)}\n堆栈信息：";
					LogManager.Error(err, ex.Demystify());
					break;

				case AggregateException ex:
					LogManager.Debug("↓↓↓" + ex.Message + "↓↓↓");
					ex.Flatten().Handle(e =>
					{
						LogManager.Error($"异常源：{e.Source}，异常类型：{e.GetType().Name}，请求路径({Request.Method})：{Request.Scheme}://{Request.Host}{HttpUtility.UrlDecode(feature.Path)}{Request.QueryString} ，客户端用户代理：{Request.Headers[HeaderNames.UserAgent]}，客户端IP：{ip}\t", e.Demystify());
						return true;
					});
					var body = await GetRequestBody(Request);
					if (!string.IsNullOrEmpty(body))
					{
						LogManager.Debug("↑↑↑请求参数：\n" + body);
					}
					break;

				case AccessDenyException:
					var entry = ip.GetIPLocation();
					var tips = Template.Create(CommonHelper.SystemSettings.GetOrAdd("AccessDenyTips", @"<h4>遇到了什么问题？</h4>
                <h4>基于主观因素考虑，您所在的地区暂时不允许访问本站，如有疑问，请联系站长！或者请联系站长开通本站的访问权限！</h4>")).Set("clientip", ip.ToString()).Set("location", entry.Address).Set("network", entry.Network).Render();
					Response.StatusCode = 403;
					return View("AccessDeny", tips);

				case TempDenyException:
					Response.StatusCode = 429;
					return Request.HasJsonContentType() || Request.Method == HttpMethods.Post ? Json(new
					{
						StatusCode = 429,
						Success = false,
						Message = $"检测到您的IP（{ip}）访问过于频繁，已被本站暂时禁止访问，请稍后再试！"
					}) : View("TempDeny");

				default:
					LogManager.Error($"异常源：{feature.Error.Source}，异常类型：{feature.Error.GetType().Name}，请求路径({Request.Method})：{Request.Scheme}://{Request.Host}{HttpUtility.UrlDecode(feature.Path)}{Request.QueryString} ，客户端用户代理：{Request.Headers[HeaderNames.UserAgent]}，客户端IP：{ip}，请求参数：\n{await GetRequestBody(Request)}\n堆栈信息：", feature.Error.Demystify());
					break;
			}
		}

		Response.StatusCode = 503;
		return Request.HasJsonContentType() || Request.Method == HttpMethods.Post ? Json(new
		{
			StatusCode = 503,
			Success = false,
			Message = "服务器发生错误！"
		}) : View();
	}

	private static async Task<string> GetRequestBody(HttpRequest req)
	{
		if (req.ContentLength > 5120)
		{
			return "请求体超长";
		}

		req.Body.Seek(0, SeekOrigin.Begin);
		using var sr = new StreamReader(req.Body, Encoding.UTF8, false);
		var body = await sr.ReadToEndAsync();
		body = HttpUtility.UrlDecode(body);
		req.Body.Position = 0;
		return body;
	}

	/// <summary>
	/// 网站升级中
	/// </summary>
	/// <returns></returns>
	[Route("ComingSoon"), ResponseCache(Duration = 360000)]
	public ActionResult ComingSoon()
	{
		return View();
	}

	/// <summary>
	/// 检查访问密码
	/// </summary>
	/// <param name="email"></param>
	/// <param name="token"></param>
	/// <returns></returns>
	[HttpPost, ValidateAntiForgeryToken, AllowAccessFirewall]
	public ActionResult CheckViewToken(string email, string token)
	{
		if (string.IsNullOrEmpty(token))
		{
			return ResultData(null, false, "请输入访问密码！");
		}

		var s = RedisClient.Get("token:" + email);
		if (!token.Equals(s))
		{
			return ResultData(null, false, "访问密码不正确！");
		}

		Response.Cookies.Append("Email", email, new CookieOptions
		{
			Expires = DateTime.Now.AddYears(1),
			SameSite = SameSiteMode.Lax
		});
		Response.Cookies.Append("FullAccessToken", email.MDString(AppConfig.BaiduAK), new CookieOptions
		{
			Expires = DateTime.Now.AddYears(1),
			SameSite = SameSiteMode.Lax
		});
		return ResultData(null);
	}

	/// <summary>
	/// 检查授权邮箱
	/// </summary>
	/// <param name="userInfoService"></param>
	/// <param name="email"></param>
	/// <returns></returns>
	[HttpPost, ValidateAntiForgeryToken, AllowAccessFirewall, ResponseCache(Duration = 100, VaryByQueryKeys = new[] { "email" })]
	public ActionResult GetViewToken([FromServices] IUserInfoService userInfoService, string email)
	{
		var validator = new IsEmailAttribute();
		if (!validator.IsValid(email))
		{
			return ResultData(null, false, validator.ErrorMessage);
		}

		if (RedisClient.Exists("get:" + email))
		{
			RedisClient.Expire("get:" + email, 120);
			return ResultData(null, false, "发送频率限制，请在2分钟后重新尝试发送邮件！请检查你的邮件，若未收到，请检查你的邮箱地址或邮件垃圾箱！");
		}

		if (!userInfoService.Any(b => b.Email == email))
		{
			return ResultData(null, false, "您目前没有权限访问这个链接，请联系站长开通访问权限！");
		}

		var token = SnowFlake.GetInstance().GetUniqueShortId(6);
		RedisClient.Set("token:" + email, token, 86400);
		BackgroundJob.Enqueue(() => CommonHelper.SendMail(Request.Host + "博客访问验证码", $"{Request.Host}本次验证码是：<span style='color:red'>{token}</span>，有效期为24h，请按时使用！", email, HttpContext.Connection.RemoteIpAddress.ToString()));
		RedisClient.Set("get:" + email, token, 120);
		return ResultData(null);
	}

	/// <summary>
	/// 响应数据
	/// </summary>
	/// <param name="data">数据</param>
	/// <param name="success">响应状态</param>
	/// <param name="message">响应消息</param>
	/// <returns></returns>
	public ActionResult ResultData(object data, bool success = true, string message = "")
	{
		return Ok(new
		{
			Success = success,
			Message = message,
			Data = data
		});
	}
}