// ==UserScript==
// @name          Google Reader - Mark Selected Items as Read
// @version       1.0
// @namespace     http://twitter.com/dimarad
// @description   This script adds the button "Mark selected as read" and a checkbox for each item.
// @include       htt*://www.google.tld/reader/view/*
// ==/UserScript==

/*
Version history

1.0 on 10/01/2009:
    - Initial version.

*/


var buttonText = "Mark selected as read";
var buttonId = "mark-selected-as-read";
var articles = new Array();

document.addEventListener("DOMNodeInserted", function(event){nodeInserted(event);}, true);

function nodeInserted(event) {
    var entries = document.getElementById("entries");
    if (entries && matchClass(entries, "list")) {
        var button = document.getElementById(buttonId);
        if (!button) {
            articles = new Array();
            appendButton();
        }
        
        var element = event.target;
        if (element. className && element.className.match(/entry\s+entry-\d+/) != null) {
            articles.push(element);
            
            var checkbox = document.createElement("input");
            checkbox.type = "checkbox";
            checkbox.className = "mark-selected-as-read-checkbox-class";
            checkbox.style.marginRight = "9px";
            checkbox.style.verticalAlign = "top";
            checkbox.addEventListener("click", function(event) {event.stopPropagation();}, true);
            var entrySecondary = element.getElementsByClassName("entry-secondary")[0];
            entrySecondary.insertBefore(checkbox, entrySecondary.firstChild);
        }
    }
}

function appendButton() {
    var viewerTopControlsId = "viewer-top-controls";
    var markAllAsReadId = "mark-all-as-read-split-button";

    var divVewerTopControls = document.getElementById(viewerTopControlsId);
    var btnMarkAllAsRead = document.getElementById(markAllAsReadId);

    if ((divVewerTopControls != null) && (btnMarkAllAsRead != null)) {
        var button = document.createElement("div");
        button.className = "goog-button goog-button-base unselectable goog-inline-block goog-button-float-left goog-button-tight scour-disabled viewer-buttons";
        button.id = buttonId;
        button.innerHTML = "<div class=\"goog-button-base-outer-box goog-inline-block\">"
                         + "<div class=\"goog-button-base-inner-box goog-inline-block\">"
                         + "<div class=\"goog-button-base-pos\">"
                         + "<div class=\"goog-button-base-top-shadow\">&nbsp;</div>"
                         + "<div class=\"goog-button-base-content\">"
                         + "<div class=\"goog-button-body\">" + buttonText + "</div>"
                         + "</div>"
                         + "</div>"
                         + "</div>"
                         + "</div>";
        button.addEventListener("click", markSelectedAsRead, false);
        divVewerTopControls.insertBefore(button, btnMarkAllAsRead);
    }
}

function matchClass (element, sClassName) {
    return (sClassName 
         && element.className 
         && element.className.length 
         && element.className.match(new RegExp("(^|\\s+)(" + sClassName +")($|\\s+)")));
}

function simulateClick(node) {
   var event = node.ownerDocument.createEvent("MouseEvents");
   event.initMouseEvent("click", true, true, window, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
   node.dispatchEvent(event);
}

function simulateKeypress(node, keyCode) {
    var event = node.ownerDocument.createEvent("KeyboardEvent");
    event.initKeyEvent("keypress", true, true, null, false, false, false, false, keyCode, 0);
    node.dispatchEvent(event);
}

function simulateRead(node) {
    simulateKeypress(node, 77); //"m" button - mark entry as read.
}

function simulateCollapse(node) {
    simulateKeypress(node, 79); //"o" button - expand/collapse entry.
}

function getArticleIcon(article) {
    var divs = article.getElementsByTagName("div");
    for (var i = 0; i < divs.length; i++) {
        var div = divs[i];
        if (matchClass(div, "entry-icons")) return div;
    }
    return null;
}

function markSelectedAsRead() {
    var container = document.getElementById("entries");
    container.style.display = "none";
    for (var i = 0; i < articles.length; i++) {
        var article = articles[i];
        var checkbox = article.getElementsByTagName("input")[0];
        if (checkbox.checked) {
            if (!(matchClass(article, "read"))) {
                var articleIcon = getArticleIcon(article);
                simulateClick(articleIcon);
                if (!(matchClass(article, "read"))) {
                    simulateRead(articleIcon);
                }
                if (matchClass(article, "expanded")) {
                    simulateCollapse(articleIcon);
                }
            }
            checkbox.checked = false;
        }
    }
    container.style.display = "block";
}