using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using OracleInternal.Secure.Network;
using System;
using System.Text;
using System.Threading.Tasks;

namespace Learn.Archives.Core.Common
{
    public class BasicAuthMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly string _realm;



        public BasicAuthMiddleware(RequestDelegate next, string realm)
        {
            _next = next;
            _realm = realm;
        }

        public async Task InvokeAsync(HttpContext context)
        {
            if (context.Request.Path.StartsWithSegments("/swagger"))
            {
                string authHeader = context.Request.Headers["Authorization"];
                if (authHeader != null && authHeader.StartsWith("Basic "))
                {
                    var encodedUsernamePassword = authHeader.Substring("Basic ".Length).Trim();
                    var decodedUsernamePassword = Encoding.UTF8.GetString(Convert.FromBase64String(encodedUsernamePassword));
                    var usernamePassword = decodedUsernamePassword.Split(':');

                    if (await IsAuthorized(usernamePassword[0], usernamePassword[1]))
                    {
                        await _next(context);
                        return;
                    }
                }

                context.Response.Headers["WWW-Authenticate"] = $"Basic realm=\"{_realm}\"";
                context.Response.StatusCode = StatusCodes.Status401Unauthorized;
                return;
            }

            await _next(context);
        }

        private async Task<bool> IsAuthorized(string username, string password)
        {
            // 在这里验证用户名和密码
            return AppCommon.Config.Admin.Account == username
                && AppCommon.Config.Admin.Password == password;
        }
    }
}