using DeluxeBackend.Models;
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using System.Numerics;
using System.Security.Claims;
using static DeluxeBackend.Enums;

namespace DeluxeBackend.Services
{

    public class LoginWithInfoResult
    {
        public required Account Account { get; set; }
        public PlatformType Platform { get; set; }
        public required string PlatformId { get; set; }
        public DeviceClassType DeviceClass { get; set; }
        public required string Locale { get; set; }
        public required string AppVersion { get; set; }
    }

    public interface IJwtService
    {
        Task<string> GenAccessToken(Account account, List<string> roles, Dictionary<string, object>? customeClaims = null);
        Task<string> GenRefreshToken(Account acc);
        Task<Account?> GetLogin(ClaimsPrincipal? User);
        Task<LoginWithInfoResult?> GetLoginWithInfo(ClaimsPrincipal? User);
    }

    public class JwtService : IJwtService
    {
        private readonly ILiteDbService db;
        private readonly IConfiguration configuration;
        private readonly DiscordBotService discord;

        public JwtService(ILiteDbService _db, IConfiguration _configuration, DiscordBotService _discord)
        {
            db = _db;
            configuration = _configuration;
            discord = _discord;
        }

        public async Task<string> GenAccessToken(Account account, List<string> roles, Dictionary<string, object>? customeClaims = null)
        {
            var issuer = configuration["JwtConfig:Issuer"];
            var key = new SymmetricSecurityKey(Convert.FromBase64String(configuration["JwtConfig:Key"]));
            var exp = DateTime.UtcNow.AddHours(1).AddMinutes(10);

            roles.AddRange(account.Roles);
            if (account.DiscordId.HasValue)
            {
                roles.AddRange(await discord.UserRoles(account.DiscordId.Value));
            }
            if (account.IsJunior == null || account.IsJunior == true)
            {
                roles.Add("junior");
            }
            roles = roles.Distinct().ToList();

            var claimsDictionary = new Dictionary<string, object>
            {
                ["role"] = roles
            };

            if (customeClaims != null)
            {
                foreach (var claim in customeClaims)
                {
                    claimsDictionary[claim.Key] = claim.Value;
                }
            }

            var tokenDect = new SecurityTokenDescriptor
            {
                Subject = new ClaimsIdentity(
                [
                    new Claim("sub", account.Id.ToString())
                ]),
                IssuedAt = DateTime.UtcNow,
                Claims = claimsDictionary,
                Expires = exp,
                Issuer = issuer,
                SigningCredentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256Signature),
            };

            var tokenHandler = new JwtSecurityTokenHandler();
            var token = tokenHandler.WriteToken(tokenHandler.CreateToken(tokenDect));

            return token;
        }

        public Task<string> GenRefreshToken(Account acc)
        {
            RefreshToken refreshToken = new()
            {
                Token = Convert.ToBase64String(Guid.NewGuid().ToByteArray()),
                Expires = DateTime.UtcNow.AddDays(2),
                Account = acc
            };
            db.RefreshTokens.Insert(refreshToken);
            return Task.FromResult(refreshToken.Token);
        }

        public Task<Account?> GetLogin(ClaimsPrincipal? User = null)
        {
            Console.WriteLine(User);
            if (User == null)
                return Task.FromResult<Account?>(null);

            string? rawPlayerId = User.FindFirst(ClaimTypes.NameIdentifier)?.Value
                               ?? User.FindFirst("sub")?.Value;

            if (string.IsNullOrEmpty(rawPlayerId))
                return Task.FromResult<Account?>(null);

            if (!long.TryParse(rawPlayerId, out long playerId))
                return Task.FromResult<Account?>(null);

            Account? player = db.Accounts.FindById(playerId);

            return Task.FromResult<Account?>(player);
        }
        public Task<LoginWithInfoResult?> GetLoginWithInfo(ClaimsPrincipal? User = null)
        {
            if (User == null)
                return Task.FromResult<LoginWithInfoResult?>(null);

            string? rawPlayerId = User.FindFirst(ClaimTypes.NameIdentifier)?.Value
                               ?? User.FindFirst("sub")?.Value;

            if (string.IsNullOrEmpty(rawPlayerId) || !long.TryParse(rawPlayerId, out long playerId))
                return Task.FromResult<LoginWithInfoResult?>(null);

            Account? player = db.Accounts.FindById(playerId);
            if (player == null)
                return Task.FromResult<LoginWithInfoResult?>(null);

            var result = new LoginWithInfoResult
            {
                Account = player,
                PlatformId = User.FindFirst("db.platform.id")?.Value,
                Locale = User.FindFirst("db.locale")?.Value,
                AppVersion= User.FindFirst("db.appver")?.Value,
            };

            string? rawPlatform = User.FindFirst("db.platform")?.Value;
            if (Enum.TryParse<PlatformType>(rawPlatform, out var platform))
            {
                result.Platform = platform;
            }

            string? rawDeviceClass = User.FindFirst("db.deviceclass")?.Value;
            if (Enum.TryParse<DeviceClassType>(rawDeviceClass, out var deviceClass))
            {
                result.DeviceClass = deviceClass;
            }

            return Task.FromResult<LoginWithInfoResult?>(result);
        }
    }
}