using AutoMapper;
using GroupService.Domain;
using GroupService.Domain.IReposities;
using GroupService.WebApi.Application.Dtos;
using GroupService.WebApi.Application.IntegrationServices;
using IM.Commons;

namespace GroupService.WebApi.Application.GroupMember
{
    public class GroupMemberService
    {
        private readonly IGroupMemberReposity reposity;
        private readonly IGroupReposity groupReposity;
        private readonly GroupMemberDomainService service;
        private readonly IIdentityIntegrationService idService;
        private IMapper mapper; private readonly IM.InitCommon.Management.RuntimePolicy runtime;

        public GroupMemberService(IGroupMemberReposity reposity, IGroupReposity groupReposity, GroupMemberDomainService service, IIdentityIntegrationService idService, IMapper mapper, IM.InitCommon.Management.RuntimePolicy runtime)
        {
            this.reposity = reposity;
            this.groupReposity = groupReposity;
            this.service = service;
            this.idService = idService;
            this.mapper = mapper; this.runtime = runtime;
        }

        public async Task<Result<List<GroupMemberResponse>>> GetByGroupIdAsync(Guid groupId, Guid userId)
        {
            var group = await groupReposity.FindByIdAsync(groupId);
            if (group is null)
            {
                return Result<List<GroupMemberResponse>>.Fail(ResultCode.GROUP_NOT_FOUND);
            }
            if (!await reposity.CheckMemberExistAsync(groupId, userId))
            {
                return Result<List<GroupMemberResponse>>.Fail(ResultCode.PERMISSION_DENIED);
            }
            var members = await reposity.FindByGroupIdAsync(groupId);

            return Result<List<GroupMemberResponse>>.Success(mapper.Map<List<GroupMemberResponse>>(members.ToList()));
        }

        public async Task<Result<GroupMemberResponse>> CreateAsync(Guid groupId, Guid userId)
        {
            var group = await groupReposity.FindByIdAsync(groupId);

            if (group is null)
            {
                return Result<GroupMemberResponse>.Fail(ResultCode.GROUP_NOT_FOUND);
            }

            if (group.Status != Domain.Enums.GroupState.Normal) throw new IM.DomainCommons.DomainException("群组已被封禁，不能加入");
            var limit = runtime.Current.GroupMemberLimit;
            if (limit > 0 && (await reposity.FindByGroupIdAsync(groupId)).Count() >= limit) throw new IM.DomainCommons.DomainException("群成员数量已达到平台上限");
            var userRes = await idService.FindUserByIdAsync(userId);
            if (!userRes.Succeeded)
            {
                return Result<GroupMemberResponse>.Fail(userRes);
            }

            var memberRes = await service.CreateAsync(userId, groupId, userRes.Data.NickName, userRes.Data.Avatar);

            if (!memberRes.Succeeded)
            {
                return Result<GroupMemberResponse>.Fail(userRes);
            }

            return Result<GroupMemberResponse>.Success(mapper.Map<GroupMemberResponse>(memberRes.Data));

        }

        public async Task<Result<bool>> CheckMemberAsync(Guid groupId, Guid userId)
        {
            var group = await groupReposity.FindByIdAsync(groupId); var exist = group?.Status == Domain.Enums.GroupState.Normal && await reposity.CheckMemberExistAsync(groupId, userId);

            return Result.Success(exist);
        }

        public async Task<Result<object>> DeleteAsync(Guid memberId, Guid operatorId)
        {
            var member = await reposity.FindByIdAsync(memberId);
            if (member is null)
            {
                return Result.Fail(ResultCode.GROUP_MEMBER_NOT_FOUNT);
            }

            var operatorMember = await reposity.FindOneByGroupIdAndUserIdAsync(member.GroupId, operatorId);
            if (operatorMember is null || operatorMember.Id == member.Id ||
                member.Role == Domain.Enums.GroupMemberRole.Master ||
                operatorMember.Role <= member.Role)
            {
                return Result.Fail(ResultCode.PERMISSION_DENIED);
            }

            member.Leave();

            return Result.Success();
        }

        public async Task<Result<object>> LeaveAsync(Guid groupId, Guid userId)
        {
            var member = await reposity.FindOneByGroupIdAndUserIdAsync(groupId, userId);
            if (member is null)
            {
                return Result.Fail(ResultCode.GROUP_MEMBER_NOT_FOUNT);
            }
            if (member.Role == Domain.Enums.GroupMemberRole.Master)
            {
                return Result.Fail<object>(ResultCode.PERMISSION_DENIED, "群主不能直接退群，请使用解散群接口");
            }

            member.Leave();
            return Result.Success();
        }
    }
}