using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.IdentityModel.Tokens;
using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Reflection;
using System.Security.Claims;
using System.Text;

namespace Infrastructure.Extensions
{
    public static class HttpContextExtensions
    {
        public static string GetJwtCookieName(this HttpContext httpContext)
        {
            return $"jwt-{Assembly.GetEntryAssembly().GetName().Name.ToLower()}";
        }

        public static void JwtSignIn(this HttpContext httpContext, string userName, bool rememberMe, IConfiguration cfg)
        {
            var token = httpContext.GetToken(userName, cfg, DateTime.Now.AddYears(1));
            var cookieOptions = new CookieOptions
            {
                HttpOnly = true
            };
            if (rememberMe)
            {
                cookieOptions.Expires = DateTimeOffset.Now.AddYears(1);
            }
            var cookieName = httpContext.GetJwtCookieName();
            httpContext.Response.Cookies.Delete(cookieName);
            httpContext.Response.Cookies.Append(cookieName, token, cookieOptions);
        }

        public static void JwtSignOut(this HttpContext httpContext)
        {
            httpContext.Response.Cookies.Delete(httpContext.GetJwtCookieName());
        }

        public static string GetToken(this HttpContext httpContext, string userName, IConfiguration cfg, DateTime expires)
        {
            var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(cfg["jwt:key"]));
            var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

            var claims = new List<Claim> { new Claim(ClaimTypes.Name, userName) };
            var token = new JwtSecurityToken(
               issuer: cfg["jwt:issuer"],
               audience: cfg["jwt:audience"],
               claims: claims,
               expires: expires,
               signingCredentials: creds);

            var tokenText = new JwtSecurityTokenHandler().WriteToken(token);
            return tokenText;
        }

        public static JwtSecurityToken ReadToken(this HttpContext httpContext, string token)
        {
            return new JwtSecurityTokenHandler().ReadJwtToken(token);
        }
    }
}