'use strict';

function stringifyNode(node) {
	switch (node.type) {
		case "operatorExpression":
			return stringifyOperator(node);
		case "numberLiteral":
			return stringifyNumberLiteral(node);
		case "stringLiteral":
			return stringifyStringLiteral(node);
		case "identifier":
			return stringifyIdentifier(node);
		default:
			throw new Error(`Unexpected node type '${node.type}'`);
	}
}

function stringifyOperator(node) {
	let result;

	switch (node.operator) {
		case "+":
		case "-":
		case "/":
		case "*":
		case "++":
		case "//":
		case "&&":
		case "||":
		case "==":
		case "!=":
		case "<":
		case "<=":
		case ">":
		case ">=":
			result = `${stringifyNode(node.left)} ${node.operator} ${stringifyNode(node.right)}`;
			break;
		case "call":
			result = `${stringifyNode(node.left)} ${stringifyNode(node.right)}`;
			break;
		case "numericalNegate":
			result = `-${stringifyNode(node.right)}`;
			break;
		case "booleanNegate":
			result = `!${stringifyNode(node.right)}`;
			break;
	}

	return `(${result})`;
}

function stringifyStringLiteral(node) {
	return `"${node.value.replace(/\\/g, "\\\\").replace(/"/g, '\\"')}"`;
}

function stringifyNumberLiteral(node) {
	return `${node.value}`;
}

function stringifyIdentifier(node) {
	return `${node.identifier}`;
}

module.exports = function stringifyTree(tree) {
	return stringifyNode(tree);
};