// ==UserScript==
// @name        Github Gist Share
// @namespace   https://github.com/jerone/UserScripts/
// @description Share your GitHub Gist to Twitter, Dabblet & as userscript.
// @homepage    https://github.com/jerone/UserScripts/tree/master/Github_Gist_Share
// @homepageURL https://github.com/jerone/UserScripts/tree/master/Github_Gist_Share
// @include     *://gist.github.com/*
// @version     4.1
// @grant       none
// @downloadURL none
// ==/UserScript==



String.format = function (string) {
	var args = Array.prototype.slice.call(arguments, 1, arguments.length);
	return string.replace(/{(\d+)}/g, function (match, number) {
		return typeof args[number] != "undefined" ? args[number] : match;
	});
};

var socials = {
	Twitter: {
		show: function(url, user, description, files, stars, forks, revisions){
			return true;
		},
		submit: function(url, user, description, files, stars, forks, revisions){
			var stats = [];
			if(files > 1){
				stats.push(files + " files");
			}
			if(stars == 1){
				stats.push(stars + " star");
			} else if(stars > 1){
				stats.push(stars + " stars");
			}
			if(forks == 1){
				stats.push(forks + " fork");
			} else if(forks > 1){
				stats.push(forks + " forks");
			}
			if(revisions > 1){
				stats.push(revisions + " revisions");
			}

			var tweet = String.format("Check out {0} #gist {1} on @github{2} |",
										user == document.querySelector(".name").textContent.trim() ? "my" : user + "'s",
										description ? "\"" + description + "\"" : "",
										stats.length > 0 ? " | " + stats.join(", ") : "");

			return "https://twitter.com/intent/tweet?original_referer=" + encodeURIComponent(url) +
						"&source=tweetbutton&url=" + encodeURIComponent(url) +
						"&text=" + encodeURIComponent(tweet);
		},
		icon: "https://si0.twimg.com/favicons/favicon.ico"
	},
	Dabblet: {
		show: function(url, user, description, files, stars, forks, revisions){
			// already defined in another UserScript: http://userscripts.org/users/31497/scripts
			return !document.getElementById("Github_Gist_Dabblet");
		},
		submit: function(url, user, description, files, stars, forks, revisions){
			var linkLong;
			if ((linkLong = document.querySelector(".site-container.js-site-container")) && linkLong.dataset.url) {
				var linkLongParts = linkLong.dataset.url.split("/");
				linkLongParts.shift();
				if (/^(?:revisions|forks|stars)$/gi.test(linkLongParts[linkLongParts.length - 1])) {
					linkLongParts.pop();
				}
				if (new RegExp(user,"gi").test(linkLongParts[0])) {
					linkLongParts.shift();
				}
				url = "/" + linkLongParts.join("/");
			} else {
				url = url.replace(new RegExp("https?:\/\/gist\.github\.com/" + user, "gi"), "");
			}
			return "http://dabblet.com/gist" + url;
		},
		icon: "http://dabblet.com/favicon.ico"
	},
	UserScript: {
		show: function(url, user, description, files, stars, forks, revisions){
			return !!document.querySelector(".bubble[id^='file-'] .raw-url[href$='.user.js']");
		},
		submit: function(url, user, description, files, stars, forks, revisions){
			return (document.querySelector(".bubble[id^='file-'] .raw-url[href$='.user.js']") || { href: ""}).href.trim();
		},
		icon: "http://wiki.greasespot.net/favicon.ico"
	}
};

function addMenuItem() {
	var link, url, menu, li, user, description, files, stars, forks, revisions;

	if ((link = document.querySelector("[name='link-field']")) && (menu = document.querySelector('ul.menu.gisttabs'))) {  // check if we're on an actual gists;
		url = link.value;
		user = document.querySelector(".author.vcard").textContent.trim();
		description = (document.querySelector(".gist-description") || document.querySelector(".js-current-repository") || { textContent: ""}).textContent.trim();
		files = document.querySelectorAll(".bubble[id^='file-']").length;
		stars = (menu.querySelector("a[href$='/stars'] .counter") || { textContent: ""}).textContent.trim();
		forks = (menu.querySelector("a[href$='/forks'] .counter") || { textContent: ""}).textContent.trim();
		revisions = (menu.querySelector("a[href$='/revisions'] .counter") || { textContent: ""}).textContent.trim();

		menu.appendChild(li = document.createElement("li"));
		li.id = "Github_Gist_Share";

		for(var key in socials){
			var social = socials[key],
				socialA = document.createElement("a"),
				socialImg = document.createElement("img");
				
			if (social.show(url, user, description, files, stars, forks, revisions) !== true) continue;
				
			li.appendChild(socialA);
			socialA.appendChild(socialImg);
			socialA.id = String.format("{0}_{1}", li.id, key.replace(/\s+/g, "_"));
			socialA.href = social.submit && social.submit(url, user, description, files, stars, forks, revisions);
			socialA.title = String.format("[{0}] {1}", key, socialA.href);
			socialA.style.display = "inline-block";
			socialA.target = "_blank";
			socialImg.src = social.icon;
			socialImg.alt = key;
		}
	}
}

// init;
addMenuItem();

// on pjax;
$(document).on("pjax:success", addMenuItem);