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

namespace GroupService.WebApi.Application.GroupInvitation
{
    public class GroupInvitationService
    {
        private readonly IGroupInvitationReposity reposity;
        private readonly IGroupMemberReposity memberReposity;
        private readonly IIdentityIntegrationService idService;
        private readonly IGroupReposity groupReposity;
        private readonly IMapper mapper;

        public GroupInvitationService(IGroupInvitationReposity reposity, IGroupMemberReposity memberReposity, IIdentityIntegrationService idService, IGroupReposity groupReposity, IMapper mapper)
        {
            this.reposity = reposity;
            this.memberReposity = memberReposity;
            this.idService = idService;
            this.groupReposity = groupReposity;
            this.mapper = mapper;
        }

        public async Task<Result<GroupInvitationResponse>> CreateAsync(Guid operatorId, Guid userId, Guid groupId)
        {
            var userRes = await idService.FindUserByIdAsync(userId);
            if (!userRes.Succeeded)
            {
                return Result<GroupInvitationResponse>.Fail(userRes);
            }
            var operatorInfo = await idService.FindUserByIdAsync(operatorId);

            var member = await memberReposity.FindOneByGroupIdAndUserIdAsync(groupId, operatorId);
            if (member == null)
            {
                return Result.Fail<GroupInvitationResponse>(ResultCode.PERMISSION_DENIED);
            }

            // 检查是否已存在对该用户的未处理邀请，避免 Duplicate entry 报错
            var existing = await reposity.FindByGroupIdAndUserIdAsync(groupId, userId);
            if (existing != null)
            {
                return Result.Success(mapper.Map<GroupInvitationResponse>(existing));
            }

            var group = await groupReposity.FindByIdAsync(groupId);

            var userProfile = new UserProfile()
            {
                Avatar = userRes.Data.Avatar,
                NickName = userRes.Data.NickName
            };

            var operatorProfile = new UserProfile()
            {
                Avatar = operatorInfo.Data.Avatar,
                NickName = operatorInfo.Data.NickName
            };

            var groupProfile = new GroupProfile()
            {
                Avatar = group.Avatar,
                GroupName = group.Name
            };

            var invitation = new Domain.Entities.GroupInvitation(groupId, groupProfile, userId, userProfile
                , operatorId, operatorProfile);
            reposity.Create(invitation);

            return Result.Success(mapper.Map<GroupInvitationResponse>(invitation));
        }

        public async Task<Result<object>> CreateBatchAsync(Guid operatorId, List<Guid> userIds, Guid groupId)
        {
            var group = await groupReposity.FindByIdAsync(groupId);
            if (group is null)
                return Result.Fail(ResultCode.GROUP_NOT_FOUND);

            // 校验操作者是否有权限（群成员/管理员/群主）
            var operatorMember = await memberReposity.FindOneByGroupIdAndUserIdAsync(groupId, operatorId);
            if (operatorMember == null)
                return Result.Fail(ResultCode.PERMISSION_DENIED);

            var operatorInfo = await idService.FindUserByIdAsync(operatorId);
            var operatorProfile = new UserProfile()
            {
                Avatar = operatorInfo.Data?.Avatar,
                NickName = operatorInfo.Data?.NickName ?? string.Empty
            };

            var groupProfile = new GroupProfile()
            {
                Avatar = group.Avatar,
                GroupName = group.Name
            };

            // 批量创建邀请，跳过已存在未处理邀请的用户
            foreach (var userId in userIds)
            {
                var existing = await reposity.FindByGroupIdAndUserIdAsync(groupId, userId);
                if (existing != null)
                    continue;

                var userRes = await idService.FindUserByIdAsync(userId);
                if (!userRes.Succeeded)
                    continue;

                var userProfile = new UserProfile()
                {
                    Avatar = userRes.Data?.Avatar,
                    NickName = userRes.Data?.NickName ?? string.Empty
                };

                var invitation = new Domain.Entities.GroupInvitation(
                    groupId, groupProfile, userId, userProfile, operatorId, operatorProfile);
                reposity.Create(invitation);
            }

            return Result.Success();
        }
        public async Task<Result<object>> HandleAsync(GroupInvitationHandleCommand command)
        {
            var invitation = await reposity.FindByIdAsync(command.InvitationId);
            if (invitation is null || invitation.UserId != command.UserId)
            {
                return Result.Fail(ResultCode.GROUP_INVITE_EXPIRED);
            }

            if (command.Action == GroupInvitationAction.Accept)
            {
                invitation.Accept();
            }
            else if (command.Action == GroupInvitationAction.Reject)
            {
                invitation.Reject();
            }

            return Result.Success();
        }

        public async Task<Result<GroupInvitationResponse>> GetByIdAsync(Guid id, Guid userId)
        {
            var invitation = await reposity.FindByIdAsync(id);

            if (invitation is null || (invitation.UserId != userId && invitation.OperatorId != userId))
            {
                return Result.Fail<GroupInvitationResponse>(ResultCode.GROUP_INVITE_EXPIRED);
            }

            return Result.Success(mapper.Map<GroupInvitationResponse>(invitation));
        }
    }
}