using Microsoft.AspNetCore.Components; 
using System.Net;
using System.Net.Http.Headers; 
using TechHelper.Client.HttpRepository; 


namespace BlazorProducts.Client.HttpInterceptor
{
	public class HttpInterceptorHandlerService : DelegatingHandler
	{
		private readonly NavigationManager _navManager; 
		private readonly RefreshTokenService2 _refreshTokenService; 

		public HttpInterceptorHandlerService(
			NavigationManager navManager,
			RefreshTokenService2 refreshTokenService)
		{
			_navManager = navManager;
			_refreshTokenService = refreshTokenService;
		}

		protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
		{
			var absolutePath = request.RequestUri?.AbsolutePath;

			if (absolutePath != null && !absolutePath.Contains("token") && !absolutePath.Contains("account"))
			{
				var token = await _refreshTokenService.TryRefreshToken(); 
				if (!string.IsNullOrEmpty(token))
				{
					
					request.Headers.Authorization = new AuthenticationHeaderValue("bearer", token);
				}
			}

			
			var response = await base.SendAsync(request, cancellationToken);

			await HandleResponse(response);

			return response;
		}

		private async Task HandleResponse(HttpResponseMessage response)
		{
			if (response is null)
			{
				
				_navManager.NavigateTo("/error");
				throw new HttpResponseException("服务器不可用。"); 
			}

			
			if (!response.IsSuccessStatusCode)
			{
				
				var errorContent = await response.Content.ReadAsStringAsync();
				Console.WriteLine($"HTTP 错误: {response.StatusCode}. 详情: {errorContent}"); 

				switch (response.StatusCode)
				{
					case HttpStatusCode.NotFound:
						// 404 Not Found error, navigate to a 404 page.
						_navManager.NavigateTo("/404");
						break;
					case HttpStatusCode.BadRequest:
						// 400 Bad Request error. Often, you don't navigate for this; you display validation errors on the UI.
						break;
					case HttpStatusCode.Unauthorized:
						// 401 Unauthorized error. Navigate to an unauthorized page or login page.
						_navManager.NavigateTo("/unauthorized"); // Or: _navManager.NavigateTo("/authentication/login");
						break;
					default:
						// For all other errors, navigate to a general error page.
						_navManager.NavigateTo("/error");
						break;
				}
			}
		}
	}

}