var cart_debug = false;

function checkSessvars()
{
	if(sessvars) {
		if(!sessvars.goods) sessvars.goods = new Array();
		return true;
	} else {
		alert("Не загружен модуль sessvars, работа с корзиной невозможна");
		return false;
	}
}

// id товара
function addGoodToCart(id, article, name, brand, price, link, comment)
{
	var i;

	if(!checkSessvars()) return;

	for(i = 0; i < sessvars.goods.length; i++) {
		if(sessvars.goods[i].id == id) {
			sessvars.goods[i].count++;
			if(cart_debug) alert("addGoodToCart: Товар найден в корзине i=" + i + ", увеличиваем количество");
			break;
		}
	}

	if(i == sessvars.goods.length) {
		sessvars.goods[i] = new Object();
		sessvars.goods[i].id = id;
		sessvars.goods[i].count = 1;
		sessvars.goods[i].article = article;
		sessvars.goods[i].name = name;
		sessvars.goods[i].brand = brand;
		sessvars.goods[i].price = price;
		sessvars.goods[i].link = link;
		if(cart_debug) alert("addGoodToCart: Товар не найден в корзине, добавляем новую запись (i=" + i + "):\n" +
						sessvars.goods[i].toString());
	}

	updateTotalPrice();
}

function putGoodToCart(id)
{
	var i, e;

	if(!checkSessvars()) return;

	for(i = 0; i < sessvars.goods.length; i++) {
		if(sessvars.goods[i].id == id) {
			sessvars.goods[i].count++;
			e = document.getElementById('count' + sessvars.goods[i].id);
			if(e) e.setAttribute("value", sessvars.goods[i].count);
			e = document.getElementById('counti' + sessvars.goods[i].id);
			if(e) e.setAttribute("value", sessvars.goods[i].count);
			if(cart_debug) alert("putGoodToCart: Товар с таким id найден в корзине, увеличим количество");
			break;
		}
	}

	updateTotalPrice();
}

function removeGoodsFromCart(id)
{
	var i, j, e;

	if(!checkSessvars()) return;

	for(i = 0; i < sessvars.goods.length; i++) {
		if(sessvars.goods[i].id == id) {
			removeGoodLine(sessvars.goods[i].id);

			for(j = i + 1; j < sessvars.goods.length - 1; j++) {
				sessvars.goods[j - 1] = sessvars.goods[j];
			}
			sessvars.goods.pop();

			if(cart_debug) alert("removeGoodsFromCart: Найден товар, корзина сомкнулась");

			break;
		}
	}

	updateTotalPrice();
}

function removeGoodLine(id)
{
	var e = document.getElementById("good" + id);
	if(e) {
		e.parentNode.removeChild(e);
		if(cart_debug) alert("removeGoodLine: Найдена строка про товар на экране, удаляем");
	}
}

function getGoodFromCart(id)
{
	var i, j, e;

	if(!checkSessvars()) return;

	for(i = 0; i < sessvars.goods.length; i++) {
		if(sessvars.goods[i].id == id) {
			if(cart_debug) alert("getGoodFromCart: Найден товар в корзине, i=" + i);
			if(sessvars.goods[i].count > 1) {
				sessvars.goods[i].count--;
				e = document.getElementById('count' + sessvars.goods[i].id);
				if(e) e.setAttribute("value", sessvars.goods[i].count);
				e = document.getElementById('counti' + sessvars.goods[i].id);
				if(e) e.setAttribute("value", sessvars.goods[i].count);
			} else {
				removeGoodLine(sessvars.goods[i].id);

				for(j = i + 1; j < sessvars.goods.length - 1; j++) {
					sessvars.goods[j - 1] = sessvars.goods[j];
				}
				sessvars.goods.pop();
				break;
			}
		}
	}

	updateTotalPrice();
}

function updateTotalPrice()
{
	var total = 0;
	var count = 0;
	for(i = 0; i < sessvars.goods.length; i++) {
		total+= sessvars.goods[i].price * sessvars.goods[i].count;
		count+= sessvars.goods[i].count;
	}

	total = Math.round(total * 100) / 100;

	var e = document.getElementById('total_price');
	if(e) e.innerHTML = Math.round(total * 100) / 100;

	if(cart_debug) alert("updateTotalPrice: count=" + count + ", total=" + total);

	e = document.getElementById("cart_div");
	var e2 = document.getElementById("to_confirm");
	if(i > 0) {
		if(e) {
			e.innerHTML = 'Товаров: <span id="goods_count">0</span> шт.<br>На сумму: <span id="goods_price">0</span> руб.<br><a href="' + global_cart_link + '">Оформить &gt;&gt;</a>';
			e.style.backgroundColor = "#fcfa60";

			var e_count = document.getElementById("goods_count");
			if(e_count) e_count.innerHTML = count;
			var e_price = document.getElementById("goods_price");
			if(e_price) e_price.innerHTML = total;
		}
		if(e2) e2.style.display = "";
	} else {
		if(e) {
			e.innerHTML = 'Нет товаров в корзине';
		}
		if(e2) e2.style.display = "none";
	}
}


function returnToShopping()
{
	history.go(-1);
}

function makeOrder()
{
	var i;

	var errors = new Array();
	form = document.forms.orderForm;
	if(!form) return false;

	if(form.name.value == "") errors.push("Не заполнено поле Имя");
	if(form.phone.value == "") errors.push("Не заполнено поле Телефон");
	//if(form.delivery.innerHTML == "") errors.push("Не заполнено поле Адрес доставки");

	if(errors.length > 0) {
		var msg = "";
		for(i = 0; i < errors.length; i++) {
			msg += errors[i] + "\n";
		}
		alert(msg);
		return false;
	} else {
		return true;
	}
}

function emptyCart()
{
	if(!checkSessvars()) return;
	sessvars.goods = new Array();
	updateTotalPrice();
}

function addVariantToCart(id, article, name, brand, price, link, comment)
{
	var s = document.getElementById("variants");
	if(!s) return;

	var v = a_variants[s.selectedIndex]; // выбранный вариант исполнения
	addGoodToCart(v.id, v.article, name + " (Вариант: " + v.name + ")", brand, v.price, link, comment);
}