/*
 * Thanks to Foxfirefey for Dreamwidth Dynamic Reading Page Expand/Collapse
 * on which this is somewhat based.
 */
 
// ==UserScript==
// @name       DW Entry Screening
// @namespace  wiring.io
// @version    0.1
// @description  Cuts entries based on keywords/journals (present or absent). Works with Core2 styles.
// @include    http://*.dreamwidth.org/*
// @exclude    http://www.dreamwidth.org/*
// @exclude    http://*.dreamwidth.org/manage*
// @exclude    http://*.dreamwidth.org/inbox*
// @exclude    http://*.dreamwidth.org/update*
// @exclude    http://*.dreamwidth.org/profile*
// @exclude    http://*.dreamwidth.org/calendar*
// @exclude    http://*.dreamwidth.org/tag*
// @exclude    http://*.dreamwidth.org/*.html*
// @copyright  2011+, Lian (http://wiring.io/)
// @require    http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js
// ==/UserScript==

/**
 * TODO/Known Bugs:
 * - UI/UX improvements?
 * - multiple filtering-- order of action: whitelist > blacklist, don't cut/collapse if already hidden, etc
 * - BUG: fix cut text display so doesn't say entry contains if mode is set to include
 */

(function(){
    /* ENUMS ---------------*/

    var NodeState = {
        EXPANDED : { name: "expanded", value: 0 },
        COLLAPSED : { name: "collapsed", value: 1 },
        HIDDEN : { name: "hidden", value: 2 },
        CUT : { name: "cut", value: 3 }
    };

    var ListType = {
        KEYWORDS : { name: "Keywords", value: 0 },
        USERS : { name: "Users", value: 1 },
        COMMUNITIES : { name: "Communities", value: 2 }
    };

    var FilterType = {
        INCLUDE : { name: "Include", value: 0 },
        EXCLUDE : { name: "Exclude", value: 1 }
    };

    /* SETTINGS -----------*/

    // default state of all entries-- if you want to change this, you can start
    // with all entries collapsed/hidden/cut and whitelist the ones you want visible/open
    var globalState = NodeState.EXPANDED;

    // put classes of things you'd like to be hidden in 'collapsed' state here
    var collapseables = new Array("entry-content", "metadata", "userpic", "entry-management-links");

    // fill in items with words/usernames you want to filter by
    // if you use EXCLUDE, the state will apply to whatever you list in items
    // if you use INCLUDE, the state will apply to everything BUT those items
    // you can add more filters or remove the examples you're not using
    var filters = [
        {
            items: ["anything_you", "want_warning_of"],
            listType: ListType.KEYWORDS,
            filterType: FilterType.EXCLUDE,
            state: NodeState.CUT
        },
        {
            items: ["anything_you", "don't_want_to_see"],
            listType: ListType.KEYWORDS,
            filterType: FilterType.EXCLUDE,
            state: NodeState.COLLAPSE
        },
        {
            items: ["individual_name"],
            listType: ListType.USERS,
            filterType: FilterType.EXCLUDE,
            state: NodeState.COLLAPSED
        },
        {
            items: ["community_name"],
            listType: ListType.COMMUNITIES,
            filterType: FilterType.EXCLUDE,
            state: NodeState.COLLAPSED
        }
    ];

    /* MAIN ------------*/

    var Utilities = function() {
    };

    Utilities.prototype = {

        getNodeState:
        function (value) {
            switch(value) {
                case 0:
                    return NodeState.EXPANDED;
                case 1:
                    return NodeState.COLLAPSED;
                case 2:
                    return NodeState.HIDDEN;
                case 3:
                    return NodeState.CUT;
            }
        }
    };

    // XPath Constructor
    var XPath = function() {
        this._path = "//div[@class='entry-content']";
        this._resultType = XPathResult.UNORDERED_NODE_ITERATOR_TYPE;
        this.init();
    };

    XPath.prototype = {

        _path: null,
        _resultType: null,
        _result: null,
        _resultArray: null,
        
        init:
        function () {
            this._result = this.getResult(this._path, document, this._resultType);
            this._resultArray = this.getResultArray(this._result);
        },

        getResult:
        function (path, scope, resultType) {
            return document.evaluate(path, scope, null, resultType, null);
        },

        getResultArray:
        function (result) {
            var temp = result.iterateNext(),
                array = [];
            while(temp) {
                array.push(temp);
                temp = result.iterateNext();
            }
            return array;
        }
    };

    // Generic Filter object
    var Filter = function() {
        this._xpath = new XPath();
        this._utils = new Utilities();
        this.createEntryList();
    };

    Filter.prototype = {
      
        _xpath: null,
        _entryList: null,
        _savedEntryList: null,

        createEntryList:
        function () {
            this._entryList = {};
            this._savedEntryList = {};

            for (var i = 0; i < this._xpath._resultArray.length; i++) {
                var entry = new Entry(this._xpath._resultArray[i]);
                var storedValue = GM_getValue(entry._uid);

                if (storedValue) {
                    entry.setState(this._utils.getNodeState(storedValue.value));
                    this._savedEntryList[entry._uid] = entry;
                } else {
                    entry.setState(globalState);
                }
                this._entryList[entry._uid] = entry;
            }
        },

        match: 
        function (listType, type, nodeState, items) {
            var matches = {};

            for (var x in this._entryList) {
                var entry = this._entryList[x];
                var matchPattern = null;
                var entryMatches = [];
                
                for (var j = 0, len = items.length; j < len; j++) {    
                    
                    switch(listType)
                    {
                        case "Keywords":
                            matchPattern = entry._innerHtml.match(new RegExp(items[j], "i"));
                            if (matchPattern) { console.log("keyword: " + items[j]+ " (" + entry._uid + ")");}
                            break;

                        case "Users":
                            matchPattern = entry.matchPoster(items[j]);
                            if (matchPattern) { console.log("user: " + items[j]+ " (" + entry._uid + ")");}
                            break;

                        case "Communities":
                            matchPattern = entry.matchJournal(items[j]);
                            if (matchPattern) { console.log("comm: " + items[j] + " (" + entry._uid + ")");}
                            break;
                    }
                    matchPattern = (type == FilterType.EXCLUDE) ? matchPattern : !matchPattern;

                    if(matchPattern) {
                        entry._matchedArray.push(items[j]);
                        entryMatches.push(items[j]); // todo: do I need both of these?
                    }
                        
                    if ((entryMatches.length > 0) && (j == len-1) && !matches[entry._uid]) {
                        entry.setState(nodeState);
                        matches[entry._uid] = entry;
                        console.log(entry);
                    }       
                }
            }

            return matches;
        }
    };

    // Entry constructor
    var Entry = function(content, state) {
        this._content = content;
        this._state = state;

        this._node = this.getEntry();
        this._innerHtml = this._content.innerHTML;
        this._url = this.getEntryLink();

        this._matchedArray = [];
        this._matchedString = "";

        this._poster = this.getPoster();
        this._journal = this.getJournal();
        this._uid = this.getEntryId();

        this._hasLinks = this.insertInteraction();
    };

    Entry.prototype = {

        _content: null,
        _node: null,
        _state: null,
        _url: null,
        _matchedArray: null,
        _matchedString: null,
        _uid: null,
        _innerHtml: null,
        _poster: null,
        _journal: null,
        _hasLinks: false,

        setMatchedString:
        function() {
            for (var i = 0; i < this._matchedArray.length; i++) {
                var connector = "";
                if (i !== 0) { connector = ", "; }
                this._matchedString += connector + this._matchedArray[i];
            }
        },

        getEntry:
        function() {
            return $(this._content).parents(".entry-wrapper");
        },

        matchPoster:
        function(poster) {
            return this._poster == poster;
            //return this._poster.match(new RegExp(poster + "$", "i"));
        },

        matchJournal:
        function(journal) {
            return this._journal == journal;
            //return this._journal.match(new RegExp(journal + "$", "i"));
        },

        getPoster:
        function() {
            var classes = this._node.attr("class");
            var regex = new RegExp("poster-[a-z]*", "i");

            return classes.match(regex)[0].split("-")[1]; 
        },

        getJournal:
        function() {
            var classes = this._node.attr("class");
            console.log(this._journal);
            var regex = new RegExp(/journal-[a-z0-9\_]+/g);
            var jMatches = classes.match(regex);
            
            for (var i = 0, len = jMatches.length; i < len; i++) {
                if (jMatches[i] !== "journal-type") {
                    return jMatches[i].split("-")[1];
                }
            }

            return false; 
        },

        getEntryLink:
        function() {
            return this._node.find(".entry-permalink a").attr("href");
        },

        getEntryId:
        function() {
            return this._poster + this._node.attr("id").match(new RegExp("[0-9]*$"))[0];
        },

        setState:
        function(state) {
            switch(state){
                case NodeState.CUT:
                    this.cut();
                    break;

                case NodeState.COLLAPSED:
                    this.collapse();
                    break;

                case NodeState.HIDDEN:
                    this.hide();
                    break;

                default:
                    this.expand();
                    break;
            }
        },

        // sets up the links on the title of the entry to manually collapse/expand/hide an entry: mostly from foxfirefey's code
        insertInteraction:
        function() {
            var that = this;
            if (!this._hasLinks) {
                // This is so people can customize it to be [] or {}
                var link_left_bracket = "[";
                var link_right_bracket = "]";

                // This is so people can customize to say "collapse" or "expand" or "delete"
                var link_collapse = "-";
                var link_expand = "+";
                var link_hide = "x";

                // Create a span containing the collapse and hide link
                // foxfirefey's code:
                var span, collapse_link, collapse_link_text, hide_link, state_link_text;
                var link_span = document.createElement("span");
                link_span.className = "entryCollapseState";
                link_span.id = "entryCollapseState-" + this._uid;
                
                var state_link = document.createElement("a");
                state_link.href = "#";
                
                // Figure out which action link to create -- collapse or expand
                if ( this._state == NodeState.COLLAPSED ) {
                    state_link.addEventListener('click', function(event) { 
                        event.stopPropagation(); event.preventDefault();
                        GM_deleteValue(that._uid);
                        that.expand(); 
                        }, true);
                    state_link_text = link_expand;
                    state_link.className = "entry-expand-link";
                    state_link.title = "Expand entry";
                }
                else {
                    state_link.addEventListener('click', function(event) { 
                        GM_setValue(that._uid, NodeState.COLLAPSED);
                        that.collapse(); event.stopPropagation(); event.preventDefault(); }, true);
                    state_link_text = link_collapse;
                    state_link.className = "entry-collapse-link";
                    state_link.title = "Collapse entry";
                }
                
                state_link.appendChild( document.createTextNode(state_link_text) );
                
                link_span.appendChild( document.createTextNode(" "));
                link_span.appendChild( document.createTextNode(link_left_bracket) );
                link_span.appendChild( state_link );
                link_span.appendChild( document.createTextNode(link_right_bracket ));
                
                hide_link = document.createElement("a");
                hide_link.href = "#";
                hide_link.addEventListener('click', function(event) { 
                    GM_setValue(that._uid, NodeState.HIDDEN);
                    that.hide(); event.stopPropagation(); event.preventDefault(); }, true);
                hide_link.title = "Hide entry";
                hide_link.appendChild( document.createTextNode(link_hide) );
                
                link_span.appendChild( document.createTextNode(" "));
                link_span.appendChild( document.createTextNode(link_left_bracket) );
                link_span.appendChild( hide_link );
                link_span.appendChild( document.createTextNode(link_right_bracket ));
                
                this._node.find(".entry-title").append( link_span );
                this._hasLinks = true;
            } else {
                this._node.find("span.entryCollapseState").remove();
                this._hasLinks = false;
                this.insertInteraction();
            }

            return this._hasLinks;
        },

        // uses a DW-esque cut to cut an entry
        // can't use an actual dw cut atm ($.dw.cuttag)
        cut:
        function() {
            this._state = NodeState.CUT;
            this.setMatchedString();
            this._content.innerHTML = '<span class="cuttag_container"><span style="display: inline;" id="span-cuttag_autogen_'+this._uid+'" class="cuttag"><a href="#" id="cuttag_autogen_'+this._uid+'" class="cuttag-action cuttag-action-before"><img style="border:0;" aria-controls="div-cuttag_autogen_'+this._uid+'" src="http://www.dreamwidth.org/img/collapse.gif" alt="Expand" title="Expand"></a></span><b>( <a href="'+this._url+'">entry text contains: '+ this._matchedString +'</a> )</b><div class="keyword-hidden-entry" style="display: none;">' + this._content.innerHTML + '</div><div style="display: none;" id="div-cuttag_autogen_'+this._uid+'" aria-live="assertive"></div></span>';

            this.initCut();
        },

        // make the button clickable
        initCut:
        function() {
            var linkButton = $(this._content).find("a.cuttag-action-before");
            var hiddenContent = $(this._content).find("div.keyword-hidden-entry");

            linkButton.bind("click", function(e) {
                e.preventDefault();
                var isHidden = ($(this._content).find(".keyword-hidden-entry:hidden").length > 0);
                var buttonState = isHidden ? "expand" : "collapse";
                linkButton.find("img").attr("src", "http://www.dreamwidth.org/img/" + buttonState + ".gif");
                hiddenContent.toggle();
            });
        },

        // completely hides an entry from view on the page
        hide:
        function() {
            this._state = NodeState.HIDDEN;
            this._node.hide();
        },

        // hides "collapseable" values in an entry instead of making a cut-- smaller footprint
        collapse:
        function() {
            this._state = NodeState.COLLAPSED;

            for ( var collapse_index in collapseables ) {
                var collapse = this._node.find("." + collapseables[collapse_index]);

                if (collapse.length > 0) {
                    collapse.hide();
                }
            }
            this.insertInteraction();
        },

        // expand collapsed entries
        expand:
        function() {
            this._state = NodeState.EXPANDED;

            for ( var expand_index in collapseables ) {
                var expand = this._node.find("." + collapseables[expand_index]);

                if( expand.length > 0 ) {
                    expand[0].style.display = '';
                }
            }

            this.insertInteraction();
        }
    };

    function clearCollapsed() {
        var listVals = GM_listValues();

        for (var i = 0, len = listVals.length; i < len; i++) {
            var val = listVals[i];
            var state = GM_getValue(val);

            if (state.value == NodeState.COLLAPSED.value) {
                GM_deleteValue(val);
            }
        }
        GM_notification("Cleared collapsed. Please refresh to see changes.");
    }

    function clearHidden() {
        var listVals = GM_listValues();

        for (var i = 0, len = listVals.length; i < len; i++) {
            var val = listVals[i];
            var state = GM_getValue(val);

            if (state.value == NodeState.HIDDEN.value) {
                GM_deleteValue(val);
            }
        }
        GM_notification("Cleared hidden. Please refresh to see changes.");
    }

    function clearAll() {
        var listVals = GM_listValues();

        for (var i = 0, len = listVals.length; i < len; i++) {
            var val = listVals[i];
            GM_deleteValue(val);
        }
        GM_notification("Cleared all. Please refresh to see changes.");
    }

    // Object to actually instantiate and pull everything together
    var Init = function() {
        
        var filter = new Filter();

        GM_registerMenuCommand("Clear stored hidden entries.", clearHidden);
        GM_registerMenuCommand("Clear stored collapsed entries.", clearCollapsed);
        GM_registerMenuCommand("Clear all stored entries.", clearAll);

        for (var f = 0, len = filters.length; f < len; f++) {
            var current = filters[f];
            filter.match(current.listType.name, current.filterType, current.state, current.items);
        }
    };

    Init();
})();