using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudDb.Model;
using AsbCloudInfrastructure.Services.Cache;
using Mapster;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Services
{
    public class PermissionService : IPermissionService
    {
        private readonly CacheTable<RelationUserRolePermission> cacheUserRolePermission;
        private readonly CacheTable<Permission> cachePermission;

        public PermissionService(IAsbCloudDbContext db, CacheDb cacheDb)
        {
            cacheUserRolePermission = cacheDb.GetCachedTable<RelationUserRolePermission>(
                (AsbCloudDbContext)db,
                new string[] { nameof(RelationUserRolePermission.Permission) });
            cachePermission = cacheDb.GetCachedTable<Permission>(
                (AsbCloudDbContext)db);
        }

        public async Task<IEnumerable<PermissionDto>> GetByIdRoleAsync(int idRole, CancellationToken token)
        {
            var entities = await cacheUserRolePermission
                .WhereAsync(p => p.IdUserRole == idRole, token)
                .ConfigureAwait(false);
            var dto = entities.Select(e => e.Permission).Adapt<PermissionDto>();
            return dto;
        }

        public async Task<int> InsertRangeAsync(IEnumerable<PermissionDto> dtos, CancellationToken token)
        {
            foreach (var dto in dtos)
            {
                var entity = Convert(dto);
                var insertedEntity = cachePermission.Insert(entity);
                cacheUserRolePermission.Insert(new RelationUserRolePermission()
                {
                    IdPermission = insertedEntity.Id,
                    IdUserRole = dto.IdUserRole
                });
            }

            return 1;
        }

        public async Task<int> UpdateAsync(PermissionDto dto, CancellationToken token)
        {
            var entity = Convert(dto);
            await cachePermission.UpsertAsync(entity, token)
                .ConfigureAwait(false);
            return 1;
        }

        public async Task<int> DeleteAsync(int idUserRole, int idPermission, CancellationToken token)
        {
            bool predicate(RelationUserRolePermission p) => p.IdUserRole == idUserRole && p.IdPermission == idPermission;
            await DeleteAsync(predicate, token);
            cachePermission.Remove(p => p.Id == idPermission);
            return 1;
        }

        public Task<int> DeleteAllByRoleAsync(int idUserRole, CancellationToken token)
        {
            bool predicate(RelationUserRolePermission p) => p.IdUserRole == idUserRole;
            return DeleteAsync(predicate, token);
        }

        private async Task<int> DeleteAsync(Func<RelationUserRolePermission, bool> predicate, CancellationToken token)
        {
            var count = (await cacheUserRolePermission.WhereAsync(predicate, token).ConfigureAwait(false)).Count();
            if (count > 0)
                await cacheUserRolePermission.RemoveAsync(predicate, token)
                    .ConfigureAwait(false);
            return count;
        }

        public Permission Convert(PermissionDto src)
        {
            var entity = src.Adapt<Permission>();
            return entity;
        }
    }
}