import {
  BadRequestException,
  ForbiddenException,
  Injectable,
  NotFoundException,
} from '@nestjs/common';
import { OrganizationService } from 'src/organization/organization.service';
import { UserService } from 'src/user/user.service';
import { InviteUserToOrganizationRequestDTO } from './dto';
import { PrismaService } from 'src/prisma/prisma.service';
import {
  ORGANIZATION_JOIN_REQUEST,
  ORGANIZATION_JOIN_REQUEST_TYPE,
} from 'prisma/generated/prisma/enums';
import { AuthorizationService } from 'src/authorization/authorization.service';
import { USER_ORGANIZATION_OPERATIONS } from 'src/authorization/operations';
import { Prisma } from 'prisma/generated/prisma/client';

@Injectable()
export class OrganizationMembershipService {
  constructor(
    private readonly userService: UserService,
    private readonly orgService: OrganizationService,
    private readonly prisma: PrismaService,
    private readonly authorization: AuthorizationService,
  ) {}
  async inviteUserToOrg(
    userId: string,
    dto: InviteUserToOrganizationRequestDTO,
  ) {
    const { invitedUserEmail, ...rest } = dto;
    const [orgExists, invitedUser] = await Promise.all([
      this.orgService.findById(dto.orgId),
      this.userService.findByEmail(invitedUserEmail),
    ]);

    if (!orgExists) throw new NotFoundException('Organization');
    if (!invitedUser) throw new NotFoundException('User');

    const userAlreadyPart =
      await this.prisma.organizationUserJoinTable.findUnique({
        where: {
          userId_orgId: {
            orgId: dto.orgId,
            userId: invitedUser.id,
          },
        },
      });

    if (userAlreadyPart)
      throw new BadRequestException('User already part of this organization');

    const canInviteUser = await this.authorization.canPerformOperation(
      userId,
      dto.orgId,
      USER_ORGANIZATION_OPERATIONS.INVITE_USERS,
    );
    if (!canInviteUser) throw new ForbiddenException('Insufficient Permission');

    try {
      const invitation = await this.prisma.organizationJoinRequest.create({
        data: {
          ...rest,
          userId: invitedUser.id,
          requestType: ORGANIZATION_JOIN_REQUEST_TYPE.INVITED,
        },
      });

      return invitation;
    } catch (err) {
      if (err instanceof Prisma.PrismaClientKnownRequestError) {
        if (err.code === 'P2002')
          throw new BadRequestException('User invitation already sent.');
      } else {
        throw err;
      }
    }
  }

  requestToJoin() {}

  // TODO: reject, rejectReason
  async acceptInvitation(userId: string, orgId: string) {
    const orgExists = await this.orgService.findById(orgId);
    if (!orgExists) throw new NotFoundException('Organization');

    const [userAlreadyPart, isUserInvited] = await Promise.all([
      this.prisma.organizationUserJoinTable.findUnique({
        where: {
          userId_orgId: {
            orgId,
            userId,
          },
        },
      }),

      this.prisma.organizationJoinRequest.findUnique({
        where: {
          userId_orgId: {
            orgId,
            userId,
          },
          status: ORGANIZATION_JOIN_REQUEST.PENDING,
        },
      }),
    ]);

    if (userAlreadyPart)
      throw new BadRequestException('User already part of this organization');
    if (!isUserInvited)
      throw new BadRequestException(
        'User has no invitations from this organization',
      );

    return await this.prisma.$transaction(async (tx) => {
      await tx.organizationJoinRequest.update({
        where: {
          userId_orgId: {
            userId,
            orgId,
          },
        },
        data: {
          status: ORGANIZATION_JOIN_REQUEST.ACCEPTED,
        },
      });

      return await tx.organizationUserJoinTable.create({
        data: {
          orgId,
          userId,
        },
      });
    });
  }

  async getUserInvitations(
    userId: string,
    requestType: ORGANIZATION_JOIN_REQUEST_TYPE = ORGANIZATION_JOIN_REQUEST_TYPE.INVITED,
    status: ORGANIZATION_JOIN_REQUEST = ORGANIZATION_JOIN_REQUEST.PENDING,
  ) {
    return await this.prisma.organizationJoinRequest.findMany({
      where: {
        userId: userId,
        status: status,
        requestType: requestType,
      },
      include: {
        organization: {
          select: { name: true },
        },
      },
    });
  }

  async getMemebersOfOrganization(orgId: string) {
    const orgExists = await this.orgService.findById(orgId);
    if (!orgExists) throw new NotFoundException('Organization');

    return await this.prisma.organizationUserJoinTable.findMany({
      where: {
        orgId: orgId,
      },
      include: {
        user: {
          select: {
            email: true,
          },
        },
      },
    });
  }
}