using GradeBookServer.Application.DTOs.User;
using GradeBookServer.Domain.Entities;
using Microsoft.Extensions.Configuration;
using Microsoft.IdentityModel.Tokens;
using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Claims;
using System.Text;
using System.Threading.Tasks;

namespace GradeBookServer.Application.Common.Authentication
{
    public class JwtTokenGenerator
    {
        private readonly IConfiguration _config;

        public JwtTokenGenerator(IConfiguration config)
        {
            _config = config;
        }

        public string GenerateToken(User user)
        {
            var claims = new[]
            {
            new Claim(ClaimTypes.NameIdentifier, user.ID.ToString()),
            new Claim(ClaimTypes.Name, user.Name),
            new Claim(ClaimTypes.Role, user.Role.ToString())
        };

            var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_config["Jwt:Key"]!));
            var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
            var token = new JwtSecurityToken(
                issuer: _config["Jwt:Issuer"],
                audience: _config["Jwt:Audience"],
                claims: claims,
                expires: DateTime.Now.AddHours(2),
                signingCredentials: creds);

            return new JwtSecurityTokenHandler().WriteToken(token);
        }
    }
}