import of from UnitJS.Fun;
import {compare, of, proj} from UnitJS.Fun;

function Table(itemMaker, sortCriterion) {
	var items = {};
	return {
		get: get,
		getAll: getAll,
		insert: insert,
		insertAll: insertAll,
		remove: remove
	};

	function get(key) {
		return items[key];
	}

	function getAll(criterion) {
		return Object.keys(items)
			.map(of(items))
			.filter(criterion || function() {return true;})
			.sort(compare(proj(sortCriterion)));
	}

	function insert(key, value) {
		items[key] = itemMaker(key, value);
	}

	function insertAll(newItems) {
		for(var key in newItems) {
			insert(key, newItems[key]);
		}
	}

	function update(mapper) {
		for(var key in items) {
			var newValue = mapper(items[key]);
			if(newValue != undefined) {
				insert(key, newValue);
			} else {
				remove(key);
			}
		}
	}

	function remove(key) {
		delete items[key];
	}
}

return {
	make: Table
}