/**
 * Linear Interpolation
 */
export const lerp = (start: number, end: number, amount: number): number => {
    return (1 - amount) * start + amount * end
}


/**
 * Clamp a number
 */
export const clamp = (num: number, a: number, b: number) => {
    return Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b))
}


/**
 * Re-maps a number from one range to another
 * @param value the incoming value to be converted
 * @param start1 lower bound of the value's current range
 * @param stop1 upper bound of the value's current range
 * @param start2 lower bound of the value's target range
 * @param stop2 upper bound of the value's target range
 * @param [withinBounds] constrain the value to the newly mapped range
 * @return remapped number
 */
export const map = (n: number, start1: number, stop1: number, start2: number, stop2: number, withinBounds: boolean): number => {
    const value = (n - start1) / (stop1 - start1) * (stop2 - start2) + start2
    if (!withinBounds) return value
    if (start2 < stop2) {
        return clamp(value, start2, stop2)
    } else {
        return clamp(value, stop2, start2)
    }
}