// ==UserScript==
// @name Gmail Announcer
// @namespace http://www.mindtrove.info/
// @description Speaks new Gmail inbox messages using Outfox
// @include https://mail.google.com/mail/*
// @include http://mail.google.com/mail/*
// @require http://outfox.googlecode.com/svn/trunk/js/outfox.js
// ==/UserScript==

var need_say = null;
var ids = {};

function sayMessages(msgs) {
    if(!outfox.defaults.config) {
	// outfox really needs a better way to detect ready ...
	need_say = msgs;
	return false;
    }

    var header = 'New messages';
    for(var id in msgs) {
	// say all messages
	var msg = msgs[id];
	var segs = msg.split('»');
	var sender = segs[0];
	var time = segs[1].slice(segs[1].search('…')+2);
	if(header) {
	    outfox.say(header);
	    header = null;
	}
	outfox.say(sender + ' at ' + time);
    }
    return true;
}

function onOutfoxReady() {
    if(need_say) {
	// say anything already queued
	sayMessages(need_say);
	ids = need_say;
	need_say = null;
    }
}

function onTableChange(event) {
    var div = event.target;
    var trs = div.getElementsByTagName('tr');

    var count = 0;
    var new_ids = {};
    var curr_ids = {};
    for(var i=0; i < trs.length; i++) {
	var tr = trs[i];
	if(tr.innerHTML.search('<b>') != -1) {
	    // marked as a new message
	    if(ids[tr.id] == undefined) {
		// never announced
		new_ids[tr.id] = tr.textContent;
		++count;
	    }
	    // curr is announced + new
	    curr_ids[tr.id] = tr.textContent;
	}
    }

    // report if we can
    if(sayMessages(new_ids)) {
	ids = curr_ids;
    } 
}

function onDocumentChange(event) {
    if(event.target.tagName == 'DIV') {
	var div = event.target;
	var tables = div.getElementsByTagName('table');
	for(var i in tables) {
	    var table = tables[i];
	    if(table.id != '' && !table.getAttribute('role')) {
		// watch just table changes from now on
		var div = table.parentNode.parentNode;
		div.addEventListener('DOMNodeInserted', onTableChange, false);
		document.removeEventListener('DOMNodeInserted', 
					     onDocumentChange, false);
		// start outfox
		var div = document.createElement('div');
		document.body.appendChild(div);
		outfox.init(div, onOutfoxReady);
		// kick off initial read manually
		onTableChange({'target' : table.parentNode});
	    }
	}
    }
}

document.addEventListener('DOMNodeInserted', onDocumentChange, false);