import {
  BadRequestException,
  Injectable,
  NotFoundException,
} from "@nestjs/common";
import { PrismaService } from "../database/prisma.service";
import { CreateAppointmentDto } from "./dto/create-appointment.dto";
import { UpdateAppointmentDto } from "./dto/update-appointment.dto";
import { Appointment } from "@prisma/client";

@Injectable()
export class AppointmentsService {
  constructor(private prisma: PrismaService) {}

  async create(
    facilityId: string,
    dto: CreateAppointmentDto,
  ): Promise<Appointment> {
    const patient = await this.prisma.patient.findUnique({
      where: {
        id: dto.patientId,
      },
    });

    if (!patient) {
      throw new NotFoundException("Patient not found");
    }

    if (!patient.facilityId) {
      throw new BadRequestException("Patient is not linked to a facility");
    }

    return this.prisma.appointment.create({
      data: {
        patientId: patient.id,
        userId: patient.userId,
        facilityId: facilityId,
        title: dto.title,
        type: dto.type,
        notes: dto.notes,
        status: dto.status,
        dateTime: new Date(dto.dateTime),
      },
    });
  }

  async findAll(facilityId: string): Promise<Appointment[]> {
    return this.prisma.appointment.findMany({
      where: {
        facilityId: facilityId,
      },
      include: {
        patient: true,
        facility: true,
      },
      orderBy: {
        dateTime: "asc",
      },
    });
  }

  async findOne(id: string, facilityId: string) {
    const appointment = await this.prisma.appointment.findFirst({
      where: {
        id,
        facilityId: facilityId,
      },
      include: {
        patient: true,
        facility: true,
      },
    });

    if (!appointment) {
      throw new NotFoundException("Appointment not found");
    }

    return appointment;
  }

  async update(
    id: string,
    facilityId: string,
    dto: UpdateAppointmentDto,
  ) {
    await this.findOne(id, facilityId);

    return this.prisma.appointment.update({
      where: {
        id,
      },
      data: {
        ...dto,
        ...(dto.dateTime && {
          dateTime: new Date(dto.dateTime),
        }),
      },
    });
  }

  async remove(id: string, facilityId: string) {
    await this.findOne(id, facilityId);

    await this.prisma.appointment.delete({
      where: {
        id,
      },
    });
  }
}