import { RandomGenerator } from "../common/RandomGenerator";
import { acopy } from "../common/Tools";

// A unique name generator
export class NameGenerator {
  // List of available choices
  private choices: string[];

  // Random generator to use
  private random: RandomGenerator;

  constructor(choices: string[], random: RandomGenerator = new RandomGenerator()) {
    this.choices = acopy(choices);
    this.random = random;
  }

  // Get a new unique name from available choices
  getName(): string | null {
    if (this.choices.length === 0) {
      return null;
    }

    var index = this.random.randInt(0, this.choices.length - 1);
    var result = this.choices[index];
    this.choices.splice(index, 1);
    return result;
  }
}