// (C) 2007-2019 GoodData Corporation
import * as seedrandom from "seedrandom";

export type RandomDataGeneratorFunction = () => string;

export interface IRandomDataGeneratorsHash {
    [key: string]: RandomDataGeneratorFunction;
}

export function createRandomGeneratorsPool(): IRandomDataGeneratorsHash {
    return {};
}

function createGenerator(generators: IRandomDataGeneratorsHash, seed: string) {
    const seedRandomInstance = seedrandom(seed);
    generators[seed] = () => Math.round(seedRandomInstance() * 1000).toString();
}

export function getRandomDataGenerator(
    generators: IRandomDataGeneratorsHash,
    baseSeed: string = "",
    secondarySeed: string = "",
) {
    const seed = baseSeed ? baseSeed + secondarySeed : null;

    if (!generators[seed]) {
        createGenerator(generators, seed);
    }

    return generators[seed];
}

export function getRandomDataValue(
    generators: IRandomDataGeneratorsHash,
    baseSeed: string = "",
    secondarySeed: string = "",
): string {
    return getRandomDataGenerator(generators, baseSeed, secondarySeed)();
}