import BaseEntity from '../../common/entities/BaseEntity';
import ValidableInterface from '../../common/interfaces/ValidableInterface';
import PassengerType from '../../PassengerType/entity/PassengerType'
import Money from '../../common/entities/Money';
import DiscountPercentage from '../../common/entities/DiscountPercentage';

export default class Concession extends BaseEntity implements ValidableInterface {
  static TYPE_FIXED = 'fixed';
  static TYPE_PERCENTAGE = 'percentage';

  private _passenger_type: PassengerType;
  private _type: string;
  private _amount: Money;
  private _percentage: DiscountPercentage;
  private _value: number;
  
  get passenger_type(): PassengerType {
    return this._passenger_type;
  }
  
  set passenger_type(value: PassengerType) {
    this._passenger_type = value;
  }
  
  get type(): string {
    return this._type;
  }
  
  set type(value: string) {
    this._type = value;
  }
  
  get amount(): Money {
    return this._amount;
  }
  
  set amount(value: Money) {
    this._amount = value;
  }
  
  get percentage(): DiscountPercentage {
    return this._percentage;
  }
  
  set percentage(value: DiscountPercentage) {
    this._percentage = value;
  }
  
  private isFixedAmount() {
    return this.type === Concession.TYPE_FIXED;
  }
  
  private isPercentageDiscount() {
    return this.type === Concession.TYPE_PERCENTAGE;
  }
  
  get value() {
    if(this.isFixedAmount()) {
      this._value = this.amount.amount;
    } else if(this.isPercentageDiscount()) {
      this._value = this.percentage.value;
    }
    
    return this._value;
  }
  
  set value(value: number) {
    this._value = value;
    
    if(this.isFixedAmount()) {
      this.amount.amount = value;
    } else if(this.isPercentageDiscount()) {
      this.percentage.value = value;
    }
  }
  
  isValid() {
    return this.invalidFields().length === 0;
  }

  invalidFields() {
    let fields = [];

    !this.passenger_type.name && fields.push('passenger_type');
    !this.hasValue(this.amount) && fields.push('amount');
    !this.hasValue(this.percentage) && fields.push('percentage');
    !this.hasValue(this.type) && fields.push('type');

    return fields;
  }
}