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// ==UserScript==
// @name mb. RANDOM RG for cats
// @version 2013.0605.1111
// @description musicbrainz.org: provides a random release group link from an artist page
// @namespace https://gist.github.com/jesus2099/5697130
// @author Tristan DANIEL (PATATE12 aka. jesus2099/shamo)
// @licence CC BY-NC-SA 3.0 FR (http://creativecommons.org/licenses/by-nc-sa/3.0/fr/)
// @requester ZaphodBeeblebrox
// @since 2013.6.3.
// @grant none
// @match *://*.musicbrainz.org/artist/*
// @run-at document-end
// ==/UserScript==
if(self.location.href.match(/^https?:\/\/([^.]+\.)?musicbrainz\.org\/artist\/.+$/)){/*@matchopera*/(function(){"use strict";
var RE_GUID = "[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}";
var MBS = self.location.protocol+"//"+self.location.host;
var art = document.querySelector("div.artistheader h1 a[href^='"+MBS+"/artist/']");
var tgt = document.querySelector("div.artistheader p.subheader");
var mbid;
if (art && tgt && (mbid = art.getAttribute("href").match(new RegExp("/artist/("+RE_GUID+")$")))) {
randomRG();
}
function randomRG() {
var xhr = new XMLHttpRequest();
xhr.addEventListener("load", function(e) {
var artist = JSON.parse(this.responseText);
var rg = artist["release-group"][Math.floor(Math.random()*artist["release-group"].length)];
var cont = tgt.appendChild(createTag("span", null, [
" 〜 ",
createTag("a", {"a":{"title":"re-randomize among "+artist["release-group"].length+" release groups"},"e":{"click":function(e){
del(getParent(this, "span"));
randomRG();
}}}, "Random"),
" release-group: ",
createTag("a", {"a":{"href":"/release-group/"+rg.id}}, [
createTag("img", {"a":{"src":"//coverartarchive.org/release-group/"+rg.id+"/front-250","alt":"♥"},"s":{"display":"none","vertical-align":"text-top","max-height":self.getComputedStyle(tgt).getPropertyValue("height")},"e":{"load":function(e){del(this.style.setProperty("display","inline"));}}}),
" "+rg.title
])
]));
if (rg.disambiguation.length > 0) {
cont.appendChild(document.createTextNode(" ("+rg.disambiguation+")"));
}
}, false);
xhr.open("get", "/ws/2/release-group?query=arid:"+mbid[1]+"&limit=100&fmt=json");
xhr.send(null);
}
function createTag(tag, gadgets, children) {
var t = document.createElement(tag);
if(t.tagName) {
if (gadgets) {
for (var attri in gadgets.a) { if (gadgets.a.hasOwnProperty(attri)) { t.setAttribute(attri, gadgets.a[attri]); } }
for (var style in gadgets.s) { if (gadgets.s.hasOwnProperty(style)) { t.style.setProperty(style.replace(/!/,""), gadgets.s[style], style.match(/!/)?"important":""); } }
for (var event in gadgets.e) { if (gadgets.e.hasOwnProperty(event)) { t.addEventListener(event, gadgets.e[event], false); } }
}
if (t.tagName == "A" && !t.getAttribute("href") && !t.style.getPropertyValue("cursor")) { t.style.setProperty("cursor", "pointer"); }
if (children) { var chldrn = children; if (typeof chldrn == "string" || chldrn.tagName) { chldrn = [chldrn]; } for(var child=0; child<chldrn.length; child++) { t.appendChild(typeof chldrn[child]=="string"?document.createTextNode(chldrn[child]):chldrn[child]); } t.normalize(); }
}
return t;
}
function del(o) {
return o.parentNode.removeChild(o);
}
function getParent(obj, tag, cls) {
var cur = obj;
if (cur.parentNode) {
cur = cur.parentNode;
if (cur.tagName.toUpperCase() == tag.toUpperCase() && (!cls || cls && cur.className.match(new RegExp("\\W*"+cls+"\\W*")))) {
return cur;
} else {
return getParent(cur, tag, cls);
}
} else {
return null;
}
}
})();}
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