using System;
using System.Threading.Tasks;
using Bit.Core.Exceptions;
using Bit.Core.Models.Table;
using Bit.Core.Repositories;
using System.Collections.Generic;
using Bit.Core.Models.Data;

namespace Bit.Core.Services
{
    public class GroupService : IGroupService
    {
        private readonly IEventService _eventService;
        private readonly IOrganizationRepository _organizationRepository;
        private readonly IOrganizationUserRepository _organizationUserRepository;
        private readonly IGroupRepository _groupRepository;

        public GroupService(
            IEventService eventService,
            IOrganizationRepository organizationRepository,
            IOrganizationUserRepository organizationUserRepository,
            IGroupRepository groupRepository)
        {
            _eventService = eventService;
            _organizationRepository = organizationRepository;
            _organizationUserRepository = organizationUserRepository;
            _groupRepository = groupRepository;
        }

        public async Task SaveAsync(Group group, IEnumerable<SelectionReadOnly> collections = null)
        {
            var org = await _organizationRepository.GetByIdAsync(group.OrganizationId);
            if (org == null)
            {
                throw new BadRequestException("Organization not found");
            }

            if (!org.UseGroups)
            {
                throw new BadRequestException("This organization cannot use groups.");
            }

            if (group.Id == default(Guid))
            {
                group.CreationDate = group.RevisionDate = DateTime.UtcNow;

                if (collections == null)
                {
                    await _groupRepository.CreateAsync(group);
                }
                else
                {
                    await _groupRepository.CreateAsync(group, collections);
                }

                await _eventService.LogGroupEventAsync(group, Enums.EventType.Group_Created);
            }
            else
            {
                group.RevisionDate = DateTime.UtcNow;
                await _groupRepository.ReplaceAsync(group, collections ?? new List<SelectionReadOnly>());
                await _eventService.LogGroupEventAsync(group, Enums.EventType.Group_Updated);
            }
        }

        public async Task DeleteAsync(Group group)
        {
            await _groupRepository.DeleteAsync(group);
            await _eventService.LogGroupEventAsync(group, Enums.EventType.Group_Deleted);
        }

        public async Task DeleteUserAsync(Group group, Guid organizationUserId)
        {
            var orgUser = await _organizationUserRepository.GetByIdAsync(organizationUserId);
            if (orgUser == null || orgUser.OrganizationId != group.OrganizationId)
            {
                throw new NotFoundException();
            }
            await _groupRepository.DeleteUserAsync(group.Id, organizationUserId);
            await _eventService.LogOrganizationUserEventAsync(orgUser, Enums.EventType.OrganizationUser_UpdatedGroups);
        }
    }
}
