/******************************/
/* お気に入り追加のスクリプト */
/******************************/

// http://www.webreference.com/js/column8/functions.html

// name - name of the cookie
// value - value of the cookie
// [expires] - expiration date of the cookie (defaults to end of current session)
// [path] - path for which the cookie is valid (defaults to path of calling document)
// [domain] - domain for which the cookie is valid (defaults to domain of calling document)
// [secure] - Boolean value indicating if the cookie transmission requires a secure transmission
// * an argument defaults when it is assigned null as a placeholder
// * a null placeholder is not required for trailing omitted arguments
function setCookie(name, value, expires, path, domain, secure) {
	var curCookie = name + "=" + escape(value) +
	((expires) ? "; expires=" + expires.toGMTString() : "") +
	((path) ? "; path=" + path : "") +
	((domain) ? "; domain=" + domain : "") +
	((secure) ? "; secure" : "");
	document.cookie = curCookie;
}

// name - name of the desired cookie
// * return string containing value of specified cookie or null if cookie does not exist
function getCookie(name) {
	var dc = document.cookie;
	var prefix = name + "=";
	var begin = dc.indexOf("; " + prefix);
	if (begin == -1) {
		begin = dc.indexOf(prefix);
		if (begin != 0) return null;
	} else
	begin += 2;
	var end = document.cookie.indexOf(";", begin);
	if (end == -1)
		end = dc.length;
	return unescape(dc.substring(begin + prefix.length, end));
}

// name - name of the cookie
// [path] - path of the cookie (must be same as path used to create cookie)
// [domain] - domain of the cookie (must be same as domain used to create cookie)
// * path and domain default if assigned null or omitted if no explicit argument proceeds
function deleteCookie(name, path, domain) {
	if (getCookie(name)) {
		document.cookie = name + "=" + 
		((path) ? "; path=" + path : "") +
		((domain) ? "; domain=" + domain : "") +
		"; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}

// date - any instance of the Date object
// * hand all instances of the Date object to this function for "repairs"
function fixDate(date) {
	var base = new Date(0);
	var skew = base.getTime();
	if (skew > 0)
		date.setTime(date.getTime() - skew);
}

// お気に入りに品番を追加
function addFavoriteAsCookie(hinban) {
	var favorite = getCookie("favorite");
	if (!favorite) {
		favorite = hinban;

	} else {
		var favoriteList = favorite.split(",");
		if (favoriteList.length > 29) {
			alert("申し訳ありません。「お気に入り」に追加できるのは30商品までです。");
			return;

		} else {
			for (i = 0; i < favoriteList.length; i++) {
				if (favoriteList[i] == hinban) {
					alert("商品 No." + hinban + " はすでに「お気に入り」に登録されています。");
					return;
				}
			}
		}

		favorite += "," + hinban;
	}

	// ユーザに確認
	var response = confirm
		("商品 No." + hinban + " を「お気に入り」に追加します。\nよろしいですか？\n「お気に入り」の保存期間は3ヶ月です。");

	if (response == true) {
		var expire = new Date();
		expire.setTime(expire.getTime() + 90 * 24 * 60 * 60 * 1000); // 3ヶ月
		setCookie("favorite", favorite, expire, '/');
	}
}

// お気に入りから品番を削除
function removeFavoriteAsCookie(hinban) {
	var favorite = getCookie("favorite");
	if (!favorite) {
		return;

	} else {
		var favoriteList = favorite.split(",");
		var newFavoriteList = "";
		for (i = 0; i < favoriteList.length; i++) {
			if (favoriteList[i] != hinban) {
				if (newFavoriteList != "")
					newFavoriteList += ",";
				newFavoriteList += favoriteList[i];
			}
		}
	}

	// ユーザに確認
	var response = confirm
		("商品 No." + hinban + " を「お気に入り」から削除します。\nよろしいですか？");

	if (response == true) {
		var expire = new Date();
		expire.setTime(expire.getTime() + 90 * 24 * 60 * 60 * 1000); // 3ヶ月
		setCookie('favorite', newFavoriteList, expire, '/');

		// ページのリロード
		document.location.reload(true);
	}
}