/**
 * numeric-utils.ts
 * Utility functions for numeric input manipulation.
 */

/**
 * incrementValue increments the value of the input by 1
 * @param input The input element to increment
 * @param max The maximum value of the input
 * @param start The starting value of the input
 * @returns true if the value was incremented, false if it looped back to 0
 */
export const incrementValue = (
	input: HTMLInputElement,
	opts: { max?: number; start: number }
): boolean => {
	if (input.value.length === 0) {
		input.value = opts.start.toString();
		return true;
	}

	const value = parseInt(input.value);
	if (value === opts.max) {
		input.value = opts.start.toString();
		return false;
	} else if (opts.max && value > opts.max) {
		input.value = (value - opts.max).toString();
		return false;
	} else {
		input.value = (value + 1).toString();
		return true;
	}
};

/**
 * decrementValue decrements the value of the input by 1
 * @param input The input element to decrement
 * @param max The maximum value of the input
 * @param start The starting value of the input
 * @returns true if the value was decremented, false if it looped back to max
 */
export const decrementValue = (
	input: HTMLInputElement,
	opts: { max?: number; start: number }
): boolean => {
	const setToMax = (): boolean => {
		if (opts.max) {
			input.value = opts.max.toString();
			return true;
		} else {
			input.value = '0';
			return false;
		}
	};

	if (input.value.length === 0) {
		return setToMax();
	}

	const value = parseInt(input.value);
	if (value <= opts.start) {
		return !setToMax();
	} else {
		input.value = (value - 1).toString();
		return true;
	}
};