Searchdoc = {};

// navigation.js ------------------------------------------

Searchdoc.Navigation = new function() {
    this.initNavigation = function() {
        var _this = this;
        
        $(document).keydown(function(e) {
            _this.onkeydown(e);
        }).keyup(function(e) {
            _this.onkeyup(e);
        });
        
        this.navigationActive = true;
    }
    
    this.setNavigationActive = function(state) {
        this.navigationActive = state;
        this.clearMoveTimeout();
    }


    this.onkeyup = function(e) {
        if (!this.navigationActive) return;
        switch(e.keyCode) {
            case 37: //Event.KEY_LEFT:
            case 38: //Event.KEY_UP:
            case 39: //Event.KEY_RIGHT:
            case 40: //Event.KEY_DOWN:
                this.clearMoveTimeout();
                break;
            }
    }

    this.onkeydown = function(e) {
        if (!this.navigationActive) return;
        switch(e.keyCode) {
            case 37: //Event.KEY_LEFT:
                if (this.moveLeft()) e.preventDefault();
                break;
            case 38: //Event.KEY_UP:
            case 73: // i
            case 67: // c (dvorak)
                if (e.keyCode == 38 || e.ctrlKey) {
                    if (this.moveUp()) e.preventDefault();
                    this.startMoveTimeout(false);
                }
                break;
            case 39: //Event.KEY_RIGHT:
                if (this.moveRight()) e.preventDefault();
                break;
            case 40: //Event.KEY_DOWN:
            case 75: // k
            case 84: // t (dvorak)
                if (e.keyCode == 40 || e.ctrlKey) {
                    if (this.moveDown()) e.preventDefault();
                    this.startMoveTimeout(true);
                }
                break;
            case 9: //Event.KEY_TAB:
            case 13: //Event.KEY_RETURN:
                if (this.$current) this.select(this.$current);
                break;
        }
        if (e.ctrlKey && e.shiftKey) this.select(this.$current);
    }

    this.clearMoveTimeout = function() {
        clearTimeout(this.moveTimeout); 
        this.moveTimeout = null;
    }

    this.startMoveTimeout = function(isDown) {
        if (!$.browser.mozilla && !$.browser.opera) return;
        if (this.moveTimeout) this.clearMoveTimeout();
        var _this = this;
    
        var go = function() {
            if (!_this.moveTimeout) return;
            _this[isDown ? 'moveDown' : 'moveUp']();
            _this.moveTimout = setTimeout(go, 100);
        }
        this.moveTimeout = setTimeout(go, 200);
    }    
    
    this.moveRight = function() {
    }
    
    this.moveLeft = function() {
    }

    this.move = function(isDown) {
    }

    this.moveUp = function() {
        return this.move(false);
    }

    this.moveDown = function() {
        return this.move(true);
    }    
}


// scrollIntoView.js --------------------------------------

function scrollIntoView(element, view) {
    var offset, viewHeight, viewScroll, height;
    offset = element.offsetTop;
    height = element.offsetHeight;
    viewHeight = view.offsetHeight;
    viewScroll = view.scrollTop;
    if (offset - viewScroll + height > viewHeight) {
        view.scrollTop = offset - viewHeight + height;
    }
    if (offset < viewScroll) {
        view.scrollTop = offset;
    }
}


// searcher.js --------------------------------------------

Searchdoc.Searcher = function(data) {
    this.data = data;
    this.handlers = [];
}

Searchdoc.Searcher.prototype = new function() {
    var CHUNK_SIZE = 1000, // search is performed in chunks of 1000 for non-bloking user input
        MAX_RESULTS = 100, // do not try to find more than 100 results
        huid = 1, suid = 1,
        runs = 0;


    this.find = function(query) {
        var queries = splitQuery(query),
            regexps = buildRegexps(queries),
            highlighters = buildHilighters(queries),
            state = { from: 0, pass: 0, limit: MAX_RESULTS, n: suid++},
            _this = this;
        this.currentSuid = state.n;
    
        if (!query) return;
    
        var run = function() {
            // stop current search thread if new search started
            if (state.n != _this.currentSuid) return;
            
            var results = performSearch(_this.data, regexps, queries, highlighters, state),
                hasMore = (state.limit > 0 && state.pass < 3);
                
            triggerResults.call(_this, results, !hasMore);
            if (hasMore) {
                setTimeout(run, 2);
            }
            runs++;
        };
        runs = 0;
        
        // start search thread
        run();
    }

    /*  ----- Events ------  */
    this.ready = function(fn) {
        fn.huid = huid;
        this.handlers.push(fn);
    }

    /*  ----- Utilities ------  */
    function splitQuery(query) {
        return jQuery.grep(query.split(/(\s+|\(\)?)/), function(string) { return string.match(/\S/) });
    }

    function buildRegexps(queries) {
        return jQuery.map(queries, function(query) { return new RegExp(query.replace(/(.)/g, '([$1])([^$1]*?)'), 'i') });
    }

    function buildHilighters(queries) {
        return jQuery.map(queries, function(query) {
            return jQuery.map( query.split(''), function(l, i){ return '\u0001$' + (i*2+1) + '\u0002$' + (i*2+2) } ).join('')
        });
    }

    // function longMatchRegexp(index, longIndex, regexps) {
    //     for (var i = regexps.length - 1; i >= 0; i--){
    //         if (!index.match(regexps[i]) && !longIndex.match(regexps[i])) return false;
    //     };
    //     return true;
    // }
    
    
    /*  ----- Mathchers ------  */
    function matchPass1(index, longIndex, queries, regexps) {
        if (index.indexOf(queries[0]) != 0) return false;
        for (var i=1, l = regexps.length; i < l; i++) {
            if (!index.match(regexps[i]) && !longIndex.match(regexps[i])) return false;
        };
        return true;
    }

    function matchPass2(index, longIndex, queries, regexps) {
        if (index.indexOf(queries[0]) == -1) return false;
        for (var i=1, l = regexps.length; i < l; i++) {
            if (!index.match(regexps[i]) && !longIndex.match(regexps[i])) return false;
        };
        return true;
    }
    
    function matchPassRegexp(index, longIndex, queries, regexps) {
        if (!index.match(regexps[0])) return false;
        for (var i=1, l = regexps.length; i < l; i++) {
            if (!index.match(regexps[i]) && !longIndex.match(regexps[i])) return false;
        };
        return true;
    }


    /*  ----- Highlighters ------  */
    function highlightRegexp(info, queries, regexps, highlighters) {
        var result = createResult(info);
        for (var i=0, l = regexps.length; i < l; i++) {
            result.title = result.title.replace(regexps[i], highlighters[i]);
            if (i > 0)
                result.namespace = result.namespace.replace(regexps[i], highlighters[i]);
        };
        return result;
    }
    
    function hltSubstring(string, pos, length) {
        return string.substring(0, pos) + '\u0001' + string.substring(pos, pos + length) + '\u0002' + string.substring(pos + length);
    }
    
    function highlightQuery(info, queries, regexps, highlighters) {
        var result = createResult(info), pos = 0, lcTitle = result.title.toLowerCase();
        pos = lcTitle.indexOf(queries[0]);
        if (pos != -1) {
            result.title = hltSubstring(result.title, pos, queries[0].length);
        }
        for (var i=1, l = regexps.length; i < l; i++) {
            result.title = result.title.replace(regexps[i], highlighters[i]);
            result.namespace = result.namespace.replace(regexps[i], highlighters[i]);
        };
        return result;
    }

    function createResult(info) {
        var result = {};
        result.title = info[0];
        result.namespace = info[1];
        result.path = info[2];
        result.params = info[3];
        result.snippet = info[4];
        result.badge = info[6];
        return result;
    }

    /*  ----- Searching ------  */
    function performSearch(data, regexps, queries, highlighters, state) {
        var searchIndex = data.searchIndex, // search by title first and then by source
            longSearchIndex = data.longSearchIndex,
            info = data.info,
            result = [],
            i = state.from, 
            l = searchIndex.length,
            togo = CHUNK_SIZE,
            matchFunc, hltFunc;
            
        while (state.pass < 3 && state.limit > 0 && togo > 0) {
            if (state.pass == 0) {
                matchFunc = matchPass1;
                hltFunc = highlightQuery;
            } else if (state.pass == 1) {
                matchFunc = matchPass2;
                hltFunc = highlightQuery;
            } else if (state.pass == 2) {
                matchFunc = matchPassRegexp;
                hltFunc = highlightRegexp;
            }
            
            for (; togo > 0 && i < l && state.limit > 0; i++, togo--) {
                if (info[i].n == state.n) continue;
                if (matchFunc(searchIndex[i], longSearchIndex[i], queries, regexps)) {
                    info[i].n = state.n;
                    result.push(hltFunc(info[i], queries, regexps, highlighters));
                    state.limit--;
                }
            };
            if (searchIndex.length <= i) {
                state.pass++;
                i = state.from = 0;
            } else {
                state.from = i;
            }
        }
        return result;
    }
    
    function triggerResults(results, isLast) {
        jQuery.each(this.handlers, function(i, fn) { fn.call(this, results, isLast) })
    }
}    




// panel.js -----------------------------------------------

Searchdoc.Panel = function(element, data, tree, frame) {
    this.$element = $(element);
    this.$input = $('input', element).eq(0);
    this.$result = $('.result ul', element).eq(0);
    this.frame = frame;
    this.$current = null;
    this.$view = this.$result.parent();
    this.data = data;
    this.searcher = new Searchdoc.Searcher(data.index);
    this.tree = new Searchdoc.Tree($('.tree', element), tree, this);
    this.init();
}

Searchdoc.Panel.prototype = $.extend({}, Searchdoc.Navigation, new function() {
    var suid = 1;

    this.init = function() {
        var _this = this;
        var observer = function() {
            _this.search(_this.$input[0].value);
        };
        this.$input.keyup(observer);
        this.$input.click(observer); // mac's clear field
    
        this.searcher.ready(function(results, isLast) {
            _this.addResults(results, isLast);
        })
    
        this.$result.click(function(e) {
            _this.$current.removeClass('current');
            _this.$current = $(e.target).closest('li').addClass('current');
            _this.select();
            _this.$input.focus();
        });
        
        this.initNavigation();
        this.setNavigationActive(false);
    }

    this.search = function(value, selectFirstMatch) {
        value = jQuery.trim(value).toLowerCase();
        this.selectFirstMatch = selectFirstMatch;
        if (value) {
            this.$element.removeClass('panel_tree').addClass('panel_results');
            this.tree.setNavigationActive(false);
            this.setNavigationActive(true);
        } else {
            this.$element.addClass('panel_tree').removeClass('panel_results');
            this.tree.setNavigationActive(true);
            this.setNavigationActive(false);
        }
        if (value != this.lastQuery) {
            this.lastQuery = value;
            this.firstRun = true;
            this.searcher.find(value);
        }
    }

    this.addResults = function(results, isLast) {
        var target = this.$result.get(0);
        if (this.firstRun && (results.length > 0 || isLast)) {
            this.$current = null;
            this.$result.empty();
        }
        for (var i=0, l = results.length; i < l; i++) {
            target.appendChild(renderItem.call(this, results[i]));
        };
        if (this.firstRun && results.length > 0) {
            this.firstRun = false;
            this.$current = $(target.firstChild);
            this.$current.addClass('current');
            if (this.selectFirstMatch) this.select();
            scrollIntoView(this.$current[0], this.$view[0])
        }
        if (jQuery.browser.msie) this.$element[0].className += '';
    }

    this.open = function(src) {
        this.frame.location.href = '../' + src;
        if (this.frame.highlight) this.frame.highlight(src);
    }

    this.select = function() {
        this.open(this.$current.data('path'));
    }

    this.move = function(isDown) {
        if (!this.$current) return;
        var $next = this.$current[isDown ? 'next' : 'prev']();
        if ($next.length) {
            this.$current.removeClass('current');
            $next.addClass('current');
            scrollIntoView($next[0], this.$view[0]);
            this.$current = $next;
        }
        return true;
    }

    function renderItem(result) {
        var li = document.createElement('li'),
            html = '', badge = result.badge;
        html += '<h1>' + hlt(result.title);
        if (result.params) html += '<i>' + result.params + '</i>';
        html += '</h1>';
        html += '<p>';
        if (typeof badge != 'undefined') {
            html += '<span class="badge badge_' + (badge % 6 + 1) + '">' + escapeHTML(this.data.badges[badge] || 'unknown') + '</span>';
        }
        html += hlt(result.namespace) + '</p>';
        if (result.snippet) html += '<p class="snippet">' + escapeHTML(result.snippet) + '</p>';
        li.innerHTML = html;
        jQuery.data(li, 'path', result.path);
        return li;
    }

    function hlt(html) {
        return escapeHTML(html).replace(/\u0001/g, '<b>').replace(/\u0002/g, '</b>')
    }

    function escapeHTML(html) {
        return html.replace(/[&<>]/g, function(c) {
            return '&#' + c.charCodeAt(0) + ';';
        });
    }

}); 

// tree.js ------------------------------------------------

Searchdoc.Tree = function(element, tree, panel) {
    this.$element = $(element);
    this.$list = $('ul', element);
    this.tree = tree;
    this.panel = panel;
    this.init();
}

Searchdoc.Tree.prototype = $.extend({}, Searchdoc.Navigation, new function() {
    this.init = function() {
        var stopper = document.createElement('li');
        stopper.className = 'stopper';
        this.$list[0].appendChild(stopper);
        for (var i=0, l = this.tree.length; i < l; i++) {
            buildAndAppendItem.call(this, this.tree[i], 0, stopper);
        };
        var _this = this;
        this.$list.click(function(e) {
            var $target = $(e.target),
                $li = $target.closest('li');
            if ($target.hasClass('icon')) {
                _this.toggle($li);
            } else {
                _this.select($li);
            }
        })
        
        this.initNavigation();
        if (jQuery.browser.msie) document.body.className += '';
    }

    this.select = function($li) {
        this.highlight($li);
        var path = $li[0].searchdoc_tree_data.path;
        if (path) this.panel.open(path);
    }
    
    this.highlight = function($li) {
        if (this.$current) this.$current.removeClass('current');
        this.$current = $li.addClass('current');
    }

    this.toggle = function($li) {
        var closed = !$li.hasClass('closed'),
            children = $li[0].searchdoc_tree_data.children;
        $li.toggleClass('closed');
        for (var i=0, l = children.length; i < l; i++) {
            toggleVis.call(this, $(children[i].li), !closed);
        };
    }

    this.moveRight = function() {
        if (!this.$current) {
            this.highlight(this.$list.find('li:first'));
            return;
        }
        if (this.$current.hasClass('closed')) {
            this.toggle(this.$current);
        }
    }
    
    this.moveLeft = function() {
        if (!this.$current) {
            this.highlight(this.$list.find('li:first'));
            return;
        }
        if (!this.$current.hasClass('closed')) {
            this.toggle(this.$current);
        } else {
            var level = this.$current[0].searchdoc_tree_data.level;
            if (level == 0) return;
            var $next = this.$current.prevAll('li.level_' + (level - 1) + ':visible:first');
            this.$current.removeClass('current');
            $next.addClass('current');
            scrollIntoView($next[0], this.$element[0]);
            this.$current = $next;
        }
    }

    this.move = function(isDown) {
        if (!this.$current) {
            this.highlight(this.$list.find('li:first'));
            return true;
        }        
        var next = this.$current[0];
        if (isDown) {
            do {
                next = next.nextSibling;
                if (next && next.style && next.style.display != 'none') break;
            } while(next);
        } else {
            do {
                next = next.previousSibling;
                if (next && next.style && next.style.display != 'none') break;
            } while(next);
        }
        if (next && next.className.indexOf('stopper') == -1) {
            this.$current.removeClass('current');
            $(next).addClass('current');
            scrollIntoView(next, this.$element[0]);
            this.$current = $(next);
        }
        return true;
    }

    function toggleVis($li, show) {
        var closed = $li.hasClass('closed'),
            children = $li[0].searchdoc_tree_data.children;
        $li.css('display', show ? '' : 'none')
        if (!show && this.$current && $li[0] == this.$current[0]) {
            this.$current.removeClass('current');
            this.$current = null;
        }
        for (var i=0, l = children.length; i < l; i++) {
            toggleVis.call(this, $(children[i].li), show && !closed);
        };
    }

    function buildAndAppendItem(item, level, before) {
        var li   = renderItem(item, level),
            list = this.$list[0];
        item.li = li;
        list.insertBefore(li, before);
        for (var i=0, l = item[3].length; i < l; i++) {
            buildAndAppendItem.call(this, item[3][i], level + 1, before);
        };
        return li;
    }

    function renderItem(item, level) {
        var li = document.createElement('li'),
            cnt = document.createElement('div'),
            h1 = document.createElement('h1'),
            p = document.createElement('p'),
            icon, i;
        
        li.appendChild(cnt);
        li.style.paddingLeft = getOffset(level);
        cnt.className = 'content';
        if (!item[1]) li.className  = 'empty ';
        cnt.appendChild(h1);
        // cnt.appendChild(p);
        h1.appendChild(document.createTextNode(item[0]));
        // p.appendChild(document.createTextNode(item[4]));
        if (item[2]) {
            i = document.createElement('i');
            i.appendChild(document.createTextNode(item[2]));
            h1.appendChild(i);
        }
        if (item[3].length > 0) {
            icon = document.createElement('div');
            icon.className = 'icon';
            cnt.appendChild(icon);
        }
        
        // user direct assignement instead of $()
        // it's 8x faster
        // $(li).data('path', item[1])
        //     .data('children', item[3])
        //     .data('level', level)
        //     .css('display', level == 0 ? '' : 'none')
        //     .addClass('level_' + level)
        //     .addClass('closed');
        li.searchdoc_tree_data = {
            path: item[1],
            children: item[3],
            level: level
        }
        li.style.display = level == 0 ? '' : 'none';
        li.className += 'level_' + level + ' closed';
        return li;
    }

    function getOffset(level) {
        return 5 + 18*level + 'px';
    }
});