import { Transform } from 'class-transformer'
import { isNil } from 'lodash'

import { parseISO } from '../../utils/date'
import { BaseModel } from '../base.model'
import { Patient } from '../patient.model'
import { User } from '../user.model'

export type CreditAuthorType = 'user' | 'patient' | 'system' | 'crava'
export type GenericAuthor = { id?: string; type?: CreditAuthorType }
export type CreditAuthor = User | Patient | GenericAuthor
export const isGenericAuthor = (author: CreditAuthor): author is GenericAuthor => !isNil(author['type'])
export const getCreditAuthorType = (creditAuthor: CreditAuthor): CreditAuthorType => {
  if (isGenericAuthor(creditAuthor)) return creditAuthor.type
  if (creditAuthor instanceof Object) return creditAuthor.constructor.name.toLocaleLowerCase() as CreditAuthorType

  return null
}

export class Credit<Model = any, ModelCreditReason = any> extends BaseModel<Credit<Model>> {
  id: string
  reason: ModelCreditReason
  @Transform(value => parseISO(value), { toClassOnly: true })
  created_at: Date
  created_by_id: string
  created_by_type: CreditAuthorType
  patient_id?: string
  subscription_id?: string
  value: number
  campaign_value: string
  credit_id: string

  setAuthor(author: CreditAuthor): void {
    if (author instanceof User) this.created_by_type = 'user'
    if (author instanceof Patient) this.created_by_type = 'patient'
    if (isGenericAuthor(author)) this.created_by_type = author.type

    this.created_by_id = author.id
  }

  static createBy<T extends Credit = Credit>(
    this: { new (args?: any): T },
    params: Partial<T> & {
      author?: CreditAuthor
    },
  ): T {
    return this['createCreditBy'](params)
  }

  protected static createCreditBy<T extends Credit>(
    this: { new (args?: any): T },
    {
      patient_id,
      reason,
      value,
      author,
      subscription_id,
      campaign_value,
      credit_id,
    }: Partial<T> & {
      author?: CreditAuthor
    },
  ): T {
    const partial: T = new this({ patient_id, reason, value, subscription_id, campaign_value, credit_id })

    if (isNil(author)) return partial

    partial.setAuthor(author)

    return partial
  }
}