"use strict";

const assert = require("assert");
const assureArray = require("assure-array");

function doConversionForLevel(structure, operations, path) {
	return operations.flatMap((operation) => {
		assert(operation.type != null);
		let handlers = structure[operation.type];
		assert(handlers != null); // FIXME: Better error reporting when this occurs, this is a bug

		return assureArray(handlers).flatMap((handler) => {
			return (typeof handler === "function")
				? handler(operation, path)
				: doConversionForLevel(handler, operation.operations, path.concat([ operation ]));
		});
	});
}

module.exports = function treeToOperations(structure, operations) {
	return doConversionForLevel(structure, operations, []);
};