// TODO 2010/05/15 - Syogo Miyagawa.
// ０．清書
/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)

	Table of Contents
	-----------------
	Configuration

	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()

	// TODO 2010/05/15 - Syogo Miyagawa.
	// 関数追加
	- nextPicture()
	- beforePicture()

	Function Calls
	- addLoadEvent(initLightbox)
*/

//-------------------------------------------------------------------------------------------------
// Configuration
// If you would like to use a custom loading image or close button reference them in the next two lines.
// TODO 2010/04/23 - Syogo Miyagawa.
// 規約に基づくファイル名に変更しました。
var picLoadingImage = "img/com/lboxLoading.gif";
var picCloseButton = "img/com/lboxClose.gif";
var g_objLink;

//-------------------------------------------------------------------------------------------------
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
// TODO 2010/05/15 - Syogo Miyagawa.
// これは恐らくスクロールされたＴＯＰの位置を取得する関数です。
// 手を入れる事はまずないでしょう。
function getPageScroll() {
	var yScroll;
	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	}
	// Explorer 6 Strict
	else if (document.documentElement && document.documentElement.scrollTop) {
		yScroll = document.documentElement.scrollTop;
	}
	// all other Explorers
	else if (document.body) {
		yScroll = document.body.scrollTop;
	}
	arrayPageScroll = new Array("", yScroll);
	return arrayPageScroll;
}

//-------------------------------------------------------------------------------------------------
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
// TODO 2010/05/15 - Syogo Miyagawa.
// これは恐らくウィンドウの有効サイズを取得してセンタリングする関数です。
// 手を入れる事はまずないでしょう。
function getPageSize() {

	var xScroll;
	var yScroll;

	if (window.innerHeight && window.scrollMaxY) {
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	}
	// all but Explorer Mac
	else if (document.body.scrollHeight > document.body.offsetHeight) {
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	}
	// Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
	else {
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}

	var windowWidth;
	var windowHeight;

	// all except Explorer
	if (self.innerHeight) {
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	}
	// Explorer 6 Strict Mode
	else if (document.documentElement && document.documentElement.clientHeight) {
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	}
	// other Explorers
	else if (document.body) {
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}

	// for small pages with total height less then height of the viewport
	if (yScroll < windowHeight) {
		pageHeight = windowHeight;
	} else {
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if (xScroll < windowWidth) {
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);
	return arrayPageSize;
}

//-------------------------------------------------------------------------------------------------
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
// TODO 2010/05/15 - Syogo Miyagawa.
// 何故ポーズが必要かはどうでもいいのですが、変更しないように気をつけましょう。
// 手を入れる事はまずないでしょう。
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime) {
			return;
		}
	}
}

//-------------------------------------------------------------------------------------------------
// getKey(key)
// Gets keycode. If "x" is pressed then it hides the lightbox.
// TODO 2010/05/15 - Syogo Miyagawa.
// 表示時のキー対応関数です。
function getKey(e) {
	// ie
	if (e == null) {
		keycode = event.keyCode;
	}
	// mozilla
	else {
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();

	// TODO 2010/05/15 - Syogo Miyagawa.
	// n:次ページがある場合はスライドする
	// b:前ページがある場合はスライドする
	// という機能を追加
	switch (key) {
	case "x":
		hideLightbox();
		break;
	case "n":
		nextPicture();
		break;
	case "b":
		beforePicture();
		break;
	}
}

//-------------------------------------------------------------------------------------------------
// listenKey()
// TODO 2010/05/15 - Syogo Miyagawa.
// 見ての通り、手を入れる個所がありません。
function listenKey () {
	document.onkeypress = getKey;
}

//-------------------------------------------------------------------------------------------------
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
// TODO 2010/05/15 - Syogo Miyagawa.
// LightBox を表示する関数です。
// 重要な関数なので手を加える際には、最新の注意を払いましょう。
function showLightbox(objLink) {

	// prep objects
	var objOverlay = document.getElementById("overlay");
	var objLightbox = document.getElementById("lightbox");
	var objLightboxLink = document.getElementById("lightboxLink");
	var objCaption = document.getElementById("lightboxCaption");
	var objImage = document.getElementById("lightboxImage");
	var objLoadingImage = document.getElementById("loadingImage");
	var objLightboxDetails = document.getElementById("lightboxDetails");
	var objKeyboardMsg = document.getElementById("keyboardMsg");

	// TODO 2010/04/23 - Syogo Miyagawa.
	// ヘッダーメニューとタイトルの Flash を隠します。
	document.getElementById("fshMenu").style.visibility = "hidden";
	document.getElementById("fshTitle").style.visibility = "hidden";

	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// center loadingImage if it exists
	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + "px");
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + "px");
		objLoadingImage.style.display = "block";
	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (arrayPageSize[1] + "px");
	objOverlay.style.display = "block";

	// preload image
	imgPreload = new Image();

	imgPreload.onload = function () {

		objImage.src = objLink.href;

		// center lightbox and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";

		objLightboxDetails.style.width = imgPreload.width + "px";

		if (objLink.getAttribute("title")) {
			objCaption.style.display = "block";
			objCaption.innerHTML = objLink.getAttribute("title");
		} else {
			objCaption.style.display = "none";
		}

		// A small pause between the image loading and displaying is required with IE,
		// this prevents the previous image displaying for a short burst causing flicker.
		if (navigator.appVersion.indexOf("MSIE") != -1) {
			pause(250);
		}

		if (objLoadingImage) {
			objLoadingImage.style.display = "none";
		}

		// Hide select boxes as they will "peek" through the image in IE
		selects = document.getElementsByTagName("select");
		for (i = 0; i != selects.length; i++) {
			selects[i].style.visibility = "hidden";
		}

		objLightbox.style.display = "block";

		// After image is loaded, update the overlay height as the new image might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + "px");

		// スライド対象が見つかった場合は、メッセージを変更
		if (g_lang == "en") {
			objLightboxLink.setAttribute("title", "");
			objKeyboardMsg.innerHTML = "<a href='#' onclick='hideLightbox(); return false;'><kbd>close</kbd></a>";
		} else {
			objLightboxLink.setAttribute("title", "");
			objKeyboardMsg.innerHTML = "<a href='#' onclick='hideLightbox(); return false;'><kbd>閉じる</kbd></a>";
		}
		var anchors = document.getElementsByTagName("a");
		for (var i=0; i < anchors.length; i++) {
			var anchor = anchors[i];
			if (anchor.getAttribute("rev") == objLink.getAttribute("href")) {
				if (g_lang == "en") {
					objLightboxLink.setAttribute("title", "click to next picture !");
					objKeyboardMsg.innerHTML = "<a href='#' onclick='nextPicture(); return false;'><kbd>next picture</kbd></a>";
				} else {
					objLightboxLink.setAttribute("title", "クリックすると次の画像を表示します！");
					objKeyboardMsg.innerHTML = "<a href='#' onclick='nextPicture(); return false;'><kbd>次の画像</kbd></a>";
				}
				break;
			}
		}

		// 設定中のオブジェクトを保存
		g_objLink = objLink;
		// Check for "x" keypress
		listenKey();
		// オーバーレイのクリック動作を設定
		objOverlay.onclick = function () { hideLightbox(); return false; }

		return false;
	}

	imgPreload.src = objLink.href;
}

//-------------------------------------------------------------------------------------------------
// hideLightbox()
// TODO 2010/05/15 - Syogo Miyagawa.
// LightBoxを閉じる関数です。
function hideLightbox() {
	// TODO 2010/04/23 - Syogo Miyagawa.
	// ヘッダーメニューとタイトルの Flash を表示します。
	document.getElementById("fshMenu").style.visibility = "visible";
	document.getElementById("fshTitle").style.visibility = "visible";

	// get objects
	objOverlay = document.getElementById("overlay");
	objLightbox = document.getElementById("lightbox");

	// hide lightbox and overlay
	objOverlay.style.display = "none";
	objLightbox.style.display = "none";

	// make select boxes visible
	selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}

	// disable keypress listener
	document.onkeypress = "";
}

//-------------------------------------------------------------------------------------------------
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
// TODO 2010/05/15 - Syogo Miyagawa.
// LightBox 対応タグを設定する関数です。
// 重要な関数なので手を加える際には、最新の注意を払いましょう。
function initLightbox() {

	if (!document.getElementsByTagName) {
		return;
	}

	// LightBox 対応リンクを初期化
	var anchors = document.getElementsByTagName("a");
	// loop through all anchor tags
	for (var i=0; i < anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")) {
			anchor.onclick = function () { showLightbox(this); return false; }
		}
	}

	// TODO 2010/05/10 - Syogo Miyagawa.
	// areaタグにも対応するように追加
	anchors = document.getElementsByTagName("area");
	// loop through all anchor tags
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")) {
			anchor.onclick = function () { showLightbox(this); return false; }
		}
	}

	var objBody = document.getElementsByTagName("body").item(0);

	// オーバーレイの生成
	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute("id", "overlay");
	objOverlay.onclick = function () { return false; }
	objOverlay.style.display = "none";
	objOverlay.style.position = "absolute";
	objOverlay.style.top = "0";
	objOverlay.style.left = "0";
	objOverlay.style.zIndex = "90";
 	objOverlay.style.width = "100%";
	objBody.insertBefore(objOverlay, objBody.firstChild);

	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// ロードイメージを生成
	// preload and create loader image
	var imgPreloader = new Image();
	// if loader image found, create link to hide lightbox and create loadingimage
	imgPreloader.onload = function () {

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute("href", "#");
		objLoadingImageLink.onclick = function () { return false; }
		objOverlay.appendChild(objLoadingImageLink);

		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = picLoadingImage;
		objLoadingImage.setAttribute("id", "loadingImage");
		objLoadingImage.style.position = "absolute";
		objLoadingImage.style.zIndex = "150";
		objLoadingImageLink.appendChild(objLoadingImage);

		// clear onLoad, as IE will flip out w/animated gifs
		imgPreloader.onload = function () { return false; };
		return false;
	}
	imgPreloader.src = picLoadingImage;

	// LightBox 本体を生成
	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute("id", "lightbox");
	objLightbox.style.display = "none";
	objLightbox.style.position = "absolute";
	objLightbox.style.zIndex = "100";
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);

	// 閉じるボタンを生成
	// preload and create close button image
	var imgPreloadCloseButton = new Image();
	// if close button image found,
	imgPreloadCloseButton.onload = function () {

		var objCloseButtonLink = document.createElement("a");
		objCloseButtonLink.setAttribute("href", "#");
		objCloseButtonLink.onclick = function () { hideLightbox(); return false; }
		objLightbox.appendChild(objCloseButtonLink);

		var objCloseButton = document.createElement("img");
		objCloseButton.src = picCloseButton;
		objCloseButton.setAttribute("id", "closeButton");
		if (g_lang == "en") {
			objCloseButton.setAttribute("title", "click to close");
		} else {
			objCloseButton.setAttribute("title", "ここをクリックすると閉じます");
		}
		objCloseButton.style.position = "absolute";
		objCloseButton.style.zIndex = "200";
		objCloseButtonLink.appendChild(objCloseButton);

		return false;
	}
	imgPreloadCloseButton.src = picCloseButton;

	// 恐らくこれは全体を囲んでるリンク
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute("id", "lightboxLink");
	objLink.setAttribute("href", "#");
	objLink.onclick = function () { nextPicture(); return false; }
	objLightbox.appendChild(objLink);

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute("id", "lightboxImage");
	objLink.appendChild(objImage);

	// フッターを生成
	// create details div, a container for the caption and keyboard message
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute("id", "lightboxDetails");
	objLightbox.appendChild(objLightboxDetails);
	// create caption
	var objCaption = document.createElement("div");
	objCaption.setAttribute("id", "lightboxCaption");
	objCaption.style.display = "none";
	objLightboxDetails.appendChild(objCaption);
	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute("id", "keyboardMsg");
	objLightboxDetails.appendChild(objKeyboardMsg);
}

//-------------------------------------------------------------------------------------------------
// TODO 2010/05/15 - Syogo Miyagawa.
// 追加関数、次の画像を表示します。
function nextPicture() {
	// 対象リンクを検索
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i < anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("rev") == g_objLink.getAttribute("href")) {
			showLightbox(anchor);
			break;
		}
	}
}

//-------------------------------------------------------------------------------------------------
// TODO 2010/05/15 - Syogo Miyagawa.
// 追加関数、前の画像を表示します。
function beforePicture() {
	// 対象リンクを検索
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i < anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("href") == g_objLink.getAttribute("rev")) {
			showLightbox(anchor);
			break;
		}
	}
}

//-------------------------------------------------------------------------------------------------
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
// TODO 2010/05/15 - Syogo Miyagawa.
// LightBoxに対応するタグをonloadで設定するイベントですが、
// Ajax で動的に読み込んだページでLightBoxを使用する場合は、再設定が必要なため全く役に立ってません。
// ぶっちゃけ邪魔なだけです。
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != "function") {
    	window.onload = func;
	} else {
		window.onload = function () {
			oldonload();
			func();
		}
	}
}

// TODO 2010/04/23 - Syogo Miyagawa.
// ここ上手く動いていないので、common.js で 直接 initLightbox() を起動します。
//addLoadEvent(initLightbox);	// run initLightbox onLoad