using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudDb.Model;
using Mapster;
using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Services
{
    public class PermissionService : IPermissionService, IConverter<PermissionDto, Permission>
    {
        private readonly IAsbCloudDbContext db;
        
        public PermissionService(IAsbCloudDbContext db)
        {
            this.db = db;
        }

        public async Task<IEnumerable<PermissionDto>> GetByIdRoleAsync(int idRole, CancellationToken token)
        {
            var entities = await db.Permissions
                .Where(p => p.IdUserRole == idRole)
                .ToListAsync(token)
                .ConfigureAwait(false);
            var dto = entities.Select(Convert);
            return dto;
        }

        public Task<int> InsertRangeAsync(IEnumerable<PermissionDto> dtos, CancellationToken token)
        {
            var entities = dtos.Select(Convert);
            db.Permissions.AddRange(entities);
            return db.SaveChangesAsync(token);
        }

        public Task<int> UpdateAsync(PermissionDto dto, CancellationToken token)
        {
            var entity = Convert(dto);
            db.Permissions.Update(entity);
            return db.SaveChangesAsync(token);
        }

        public Task<int> DeleteAsync(int idUserRole, int idPermission, CancellationToken token)
        {
            var entities = db.Permissions.AsNoTracking()
                .Where(e => e.IdUserRole == idUserRole && e.IdPermission == idPermission)
                .ToList();
            if (!entities.Any())
                return Task.FromResult(0);
            db.Permissions.RemoveRange(entities);
            return db.SaveChangesAsync(token);
        }

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

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