using IdentityServer.Application.Stores;
using IdentityServer.Domain.Entities;
using IdentityServer.Domain.Models;
using IdentityServer.Domain.Repositories;
using System;
using System.Threading.Tasks;

namespace IdentityServer.Application.Services
{
    public class UserService : IUserService
    {
        private readonly ISecurityStore _securityStore;
        private readonly IIdentityRepository _identityRepository;

        public UserService(ISecurityStore securityStore, IIdentityRepository identityRepository)
        {
            _securityStore = securityStore;
            _identityRepository = identityRepository;
        }

        public async Task<Token> Authenticate(string userName, string password)
        {
            var user = await _identityRepository.GetAppUser(userName, password);
            if (user == null)
                return null;

            var tokenRaw = $"{Guid.NewGuid()}-{Guid.NewGuid()}-{user.UserId}";

            var currentDate = DateTime.Now;
            var token = new Token() { Raw = tokenRaw, ValidFrom = currentDate, ValidUntil = currentDate.AddMonths(12) };
            _securityStore.SetToken(token, user.UserId);

            return token;
        }

        public async Task<AppUser> Authorize(string token)
        {
            var tokenValidation = _securityStore.ValidateToken(token);
            if (tokenValidation.Success)
            {
                var user = await _identityRepository.GetAppUser(tokenValidation.UserId);
                return user;
            }

            return null;
        }
    }
}