// (C) 2007-2019 GoodData Corporation
import { range } from "lodash";
import { getRandomDataGenerator, getRandomDataValue, createRandomGeneratorsPool } from "../randomGenerator";

describe("getRandomValue", () => {
    it("should generate deterministic values when seed used", () => {
        const randomGeneratorPool = createRandomGeneratorsPool();
        const values = range(5).map(() =>
            getRandomDataValue(randomGeneratorPool, "base-seed", "secondary-seed-test1"),
        );

        expect(values).toEqual(["574", "329", "571", "641", "848"]);

        const values2 = range(5).map(() =>
            getRandomDataValue(randomGeneratorPool, "base-seed", "secondary-seed-test1"),
        );
        expect(values2).toEqual(["251", "934", "416", "294", "122"]);
    });

    it("should generate different values for different seeds", () => {
        const randomGeneratorPool = createRandomGeneratorsPool();
        const valuesA = range(5).map(() =>
            getRandomDataValue(randomGeneratorPool, "base-seed", "secondary-seed-A-test2"),
        );
        const valuesB = range(5).map(() =>
            getRandomDataValue(randomGeneratorPool, "base-seed", "secondary-seed-B-test2"),
        );

        expect(valuesA).not.toEqual(valuesB);
    });

    it("should generate different values for every generator when seed not used", () => {
        const randomGeneratorPool = createRandomGeneratorsPool();
        const valuesA = range(5).map(() => getRandomDataValue(randomGeneratorPool));
        const valuesB = range(5).map(() => getRandomDataValue(randomGeneratorPool));

        expect(valuesA).not.toEqual(valuesB);
    });
});

describe("getRandomDataGenerator", () => {
    it("should get generator function", () => {
        const randomGeneratorPool = createRandomGeneratorsPool();
        const generator = getRandomDataGenerator(randomGeneratorPool);

        expect(typeof generator).toBe("function");
    });

    it("should use same generator when same seed used", () => {
        const randomGeneratorPool = createRandomGeneratorsPool();
        const generatorA = getRandomDataGenerator(randomGeneratorPool, "base-seed", "secondary-seed-test3");
        const generatorB = getRandomDataGenerator(randomGeneratorPool, "base-seed", "secondary-seed-test3");

        expect(generatorA).toBe(generatorB);
    });

    it("should use different generator when different seed used", () => {
        const randomGeneratorPool = createRandomGeneratorsPool();
        const generatorA = getRandomDataGenerator(randomGeneratorPool, "base-seed", "secondary-seed-A-test4");
        const generatorB = getRandomDataGenerator(randomGeneratorPool, "base-seed", "secondary-seed-B-test4");

        expect(generatorA).not.toBe(generatorB);
    });
});