using PARR.API.Authentication.Models;
using PARR.API.Services.Interfaces;
using PARR.API.Settings;
using PARR.Constants;
using PARR.DAL.CacheServices;
using PARR.DAL.Services.Interfaces;

namespace PARR.API.Services.Implementations
{
    public class AuthService : IAuthService
    {
        private readonly IRedisCacheService cacheService;
        private readonly IUserService userService;
        private readonly IHostService hostService;
        private readonly UserCacheSettings userCacheSettings;

        public AuthService(IRedisCacheService cacheService, IUserService userService, IHostService hostService, UserCacheSettings userCacheSettings)
        {
            this.cacheService = cacheService;
            this.userService = userService;
            this.hostService = hostService;
            this.userCacheSettings = userCacheSettings;
        }


        public async Task<bool> UserIsBlockedAsync(string ipAddress)
        {
            //пользователь есть в списке блокировки?
            var existUserInBlockList = await cacheService.GetCachedDataAsync<DateTimeOffset?>(GetBlockKey(ipAddress));

            return existUserInBlockList != null;
        }


        public async Task<UserCache?> GetUserAsync(string ipAddress)
        {
            // смотрим, есть ли в кэше
            var userInCache = await cacheService.GetCachedDataAsync<UserCache>(GetAllowKey(ipAddress));
            if (userInCache != null)
                return userInCache;

            // нет в кэше
            var roles = new List<UserRoleInCache>();

            var user = await userService.GetByIpWithRolesAsync(ipAddress);
            if (user != null)
                user.Roles.ToList().ForEach(t =>
                {
                    if (t.Role != null)
                        roles.Add(new UserRoleInCache { Name = t.Role.Name, Description = t.Role.Description });
                });

            var host = await hostService.GetByIpAsync(ipAddress);
            if (host != null)
                roles.Add(new UserRoleInCache { Name = ParrRoles.Agent.Role, Description = ParrRoles.Agent.Description });

            if (user == null && host == null)
            {
                // если это не пользователь и не хост, добавляем в кэш на блокировку
                await cacheService.SetCachedDataAsync(GetBlockKey(ipAddress), DateTimeOffset.UtcNow, userCacheSettings.UserBlockTtl);

                return null;
            }

            // пользователь есть, добавляем в КЭШ и возвращаем роли
            var cacheData = new UserCache
            {
                UserIp = ipAddress,
                Roles = roles,
                Name = user!.Name,
                Description = user.Description ?? string.Empty
            };

            await cacheService.SetCachedDataAsync(GetAllowKey(ipAddress), cacheData, userCacheSettings.UserCacheTtl);

            return cacheData;
        }


        private string GetBlockKey(string ipAddress)
        {
            // d - deny
            return $"d_{ipAddress}";
        }

        private string GetAllowKey(string ipAddress)
        {
            // a - allow
            return $"a_{ipAddress}";
        }


    }
}