type Strategy<T> = {
  validate(value: T): boolean;
  algorithmInterface(): void;
};

// ConcreteStrategyA
export class EmailValidationStrategy implements Strategy<string> {
  validate(value: string): boolean {
    return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.exec(value) !== null;
  }

  algorithmInterface(): void {
    console.log("ConcreteStrategyA");
  }
}

// ConcreteStrategyB
export class PhoneValidationStrategy implements Strategy<string> {
  validate(value: string): boolean {
    return /^(\+?\d{1,2}[-\s]?|)(?:\d{3}[-\s]?){2}\d{4}$/.exec(value) !== null;
  }

  algorithmInterface(): void {
    console.log("ConcreteStrategyB");
  }
}

// ConcreteStrategyC
export class MonthValidationStrategy implements Strategy<string> {
  validate(value: string): boolean {
    return (
      /^(Jan|Feb|March|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)$/.exec(value) !==
      null
    );
  }

  algorithmInterface(): void {
    console.log("ConcreteStrategyC");
  }
}

export class Context {
  constructor(private readonly strategy: Strategy<string>) {}

  // ContextInterface(): void {
  //   this.strategy.algorithmInterface();
  // }

  validate(value: string): boolean {
    return this.strategy.validate(value);
  }
}