// ==UserScript==
// @name          Pixiv Simplifier
// @version       1.0
// @namespace     http://www.pixiv.net/2points
// @description	  Removes some annoyances from Pixiv.
// @include       http://www.pixiv.net/*
// @run-at        document-end
// ==/UserScript==

if (!document.body) return;

var navigateTo = function(url) {
	document.location.replace(url);
};

/// Open image directly instead of embedded in Pixiv page (for easier saving)
var ImagesOpenDirectly = function() {
	// Check if the user is on a big image page
	if (window.location.href.match("mode=big"))
	{
		// Find the first image on the site
		var imgTags = document.getElementsByTagName("img")
		// Redirect the user to this image
		if (imgTags.length > 0)
		{
			navigateTo(imgTags[0].src);
		}
	}
};

/// Remove target=_blank from all image hyperlinks
#########################################################var LinksOpenInSameWindow = function() {
	// Find all hyperlinks that contain an image tag
	var imgLinks = document.evaluate("//img/parent::a[@target]", 
			document.body, null, 
			XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
			null);

	// Iterate through those links
	for (var i = 0; i < imgLinks.snapshotLength; ++i)
	{
		var link = imgLinks.snapshotItem(i);
		// Remove the target attribute
		link.removeAttribute("target");
	}
};

// Loads manga pages before the user scrolls them into view
var PreloadMangaPages = function() {
	if (window.location.search.indexOf("mode=manga") != -1) {
		var imageBoxes = document.getElementsByClassName("placeholder");
		for (var i = imageBoxes.length - 1; i >= 0; --i) {
			var container = imageBoxes[i];
			var imageUrl = /unshift\('([^']+)'\)/.exec(container.innerHTML)[1];
			var image = container.getElementsByTagName("img")[0];

			container.setAttribute("class",
				container.getAttribute("class").replace("placeholder", ""));
			image.setAttribute("src", imageUrl);
		}
	}
};

// Removes text and image ads
var RemoveAds = function() {
	var advertAreas = document.querySelectorAll('div.ads_area');
	for (i = 0; i < advertAreas.length; ++i)
		advertAreas[i].parentNode.removeChild(advertAreas[i]);
};

/// Add all functions that should be performed
ImagesOpenDirectly();
LinksOpenInSameWindow();
PreloadMangaPages();
RemoveAds();