import { Injectable } from '@nestjs/common'
import { subMonths } from 'date-fns'
import { first, isNil } from 'lodash'

import { AnthropometryRepository } from '../../../repositories'
import { BioimpedanceWithWeight } from '../models/bioimpedance-with-weight.model'

@Injectable()
export class BioimpedanceHelper {
  constructor(private readonly anthropometryRepository: AnthropometryRepository) {}

  async getLastBioimpedanceFromLast30Days(patientId: string): Promise<BioimpedanceWithWeight> {
    const anthropometries = await this.anthropometryRepository.findByPatientSince(patientId, subMonths(new Date(), 1))
    const anthropometry = first(anthropometries.filter(anthropometry => !isNil(anthropometry.bioimpedance_id)))

    return !isNil(anthropometry)
      ? BioimpedanceWithWeight.toInstance({
          ...anthropometry.bioimpedance,
          weight: anthropometry.weight,
          done_at: anthropometry.done_at,
        })
      : null
  }

  async getBioimpedanceByAnthropometry(patientId: string): Promise<BioimpedanceWithWeight> {
    const anthropometry = await this.anthropometryRepository.getWithBioimpedance(patientId)

    return !isNil(anthropometry?.bioimpedance_id)
      ? BioimpedanceWithWeight.toInstance({
          ...anthropometry.bioimpedance,
          weight: anthropometry.weight,
          done_at: anthropometry.done_at,
        })
      : null
  }
}