const isString = (text: unknown): text is string => {
    return typeof text === "string" || text instanceof String;
};

const parseString = (data: unknown): string => {
    if (!isString(data)) {
        throw new Error("data is not a string");
    }

    return data;
};

const isNumber = (number: unknown): number is number => {
    return typeof number === "number" && !isNaN(number);
};

const parseNumber = (data: unknown): number => {
    if (!isNumber(data)) {
        throw new Error("data is not a number");
    }

    return Number(data);
};

const isDate = (date: string) => {
    if (!Date.parse(date)) {
        throw new Error("invalid date");
    }
    return date;
};

const parseDateNumber = (date: unknown): string => {
    if (!isString(date) || !isDate(date)) {
        throw new Error("date could not be parsed");
    }

    return date;
};

const parseEmail = (email: unknown): string => {
    if (!isString(email)) {
        throw new Error("incorrect email");
    }
    return email;
};

const isBoolean = (booleanCandidate: unknown): booleanCandidate is boolean => {
    return typeof booleanCandidate === "boolean";
};

const parseBoolean = (booleanCandidate: unknown): boolean => {
    if (!isBoolean(booleanCandidate)) {
        throw new Error("argument was not a boolean");
    }
    return booleanCandidate;
};

export { isString, isNumber, parseString, parseNumber, parseDateNumber, parseBoolean, parseEmail };