the-obelisk/app/Elements/Classes/Say/OneOf.ts

/// <reference path="../Say.ts" />
class OneOf {
    private possibilities = [];
    private availablePossibilites;
    private randomMode : number;

    public static PURELY_AT_RANDOM : number = 0;
    public static ROTATING_RANDOM : number = 1;
    public static CYCLING : number = 2;

    private cyclingOrder : number = 0;

    public constructor (randomMode : number, ...poss : Array<any>) {
        this.randomMode = randomMode;
        this.addPossibilities(...poss);
    }

    public addPossibilities (...poss : Array<any>) {
        this.possibilities.push(...poss);
        this.updatePossibilities();
    }

    public updatePossibilities () {
        if (this.randomMode == OneOf.ROTATING_RANDOM) {
            this.availablePossibilites = this.possibilities.slice();
        }
    }

    public getOne () {
        if (this.randomMode == OneOf.PURELY_AT_RANDOM) {
            return this.possibilities[Math.floor(Math.random() * this.possibilities.length)];
        } else if (this.randomMode == OneOf.ROTATING_RANDOM) {
            if (this.availablePossibilites.length < 1) {
                this.availablePossibilites = this.possibilities.slice();
            }
            return this.availablePossibilites.splice(Math.floor(Math.random() * this.availablePossibilites.length), 1)[0]
        } else if (this.randomMode == OneOf.CYCLING) {
            var r = this.possibilities[this.cyclingOrder++];
            if (this.cyclingOrder > this.possibilities.length) {
                this.cyclingOrder = 0;
            }
            return r;
        }
    }
}