/*
The MIT License

Copyright (c) 2007 kilrey(kilrey@kilrey.com)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
 */
var global_items = {};
var fields = ['title', 'src'];

function appendNext(node, next) {
    if (node.nextSibling) {
        node.parentNode.insertBefore(next, node.nextSibling);
    } else {
        node.parentNode.appendChild(next);
    }
}

function buildBlocks(src) {
    var result = document.getElementById('result');
    result.innerHTML = '';
    while (src!='') {
        src = src.replace(/^\n+/, '');
        if (src.match(/^((?:-.+\n)*-.+)/)) {
            src = RegExp.rightContext;
            var blk = RegExp.lastMatch;
            blk = blk.replace(/^-/gm, '');
            var lines = blk.split(/\n/);
            var ul = document.createElement('ul');
            for (var i=0; i < lines.length; i++) {
                var li = document.createElement('li');
                li.appendChild(document.createTextNode(lines[i]));
                ul.appendChild(li);
            }
            result.appendChild(ul);
        } else if (src.match(/^((?:>.*\n)*>.*)/)) {
            src = RegExp.rightContext;
            var blk = RegExp.lastMatch;
            blk = blk.replace(/^>/gm, '');
            var bq = document.createElement('blockquote');
            bq.appendChild(document.createTextNode(blk));
            result.appendChild(bq);
        } else if (src.match(/^((?:[^>\-\n].*\n)*[^>\-\n].*)/)) {
            src = RegExp.rightContext;
            var blk = RegExp.lastMatch;
            var p = document.createElement('p');
            p.appendChild(document.createTextNode(blk));
            result.appendChild(p);
        } else {
            src = src.substring(1,src.length);
        }
    }
    buildKeys(result);
}

function buildKeys(node, regexp) {
    if (!regexp) {
        var src = '';
        for (key in global_items) {
            if (src!='') {
                src += '|';
            }
            src += key;
        }
        if (src=='') {
            return;
        }
        regexp = new RegExp(src);
    }
    if (node.nodeType==1) {
        if (!node.nodeName.match(/a/i)) {
            for (var i=0; i<node.childNodes.length; i++) {
                buildKeys(node.childNodes[i]);
            }
        }
    } else if (node.nodeType==3) {
        if (node.nodeValue.match(/(https?|ftp)(:\/\/[-_.!~*\'()a-zA-Z0-9;\/?:\@&=+\$,%#]+)/)) {
            var left = RegExp.leftContext;
            var key = RegExp.lastMatch;
            var right = RegExp.rightContext;
            node.nodeValue = left;
            var a = document.createElement('a');
            a.setAttribute('href', key);
            a.setAttribute('rel', 'nofollow');
            if (key.match(/#(.+)/)) {
                a.setAttribute('onclick',
                               'readWiki("'+RegExp.$1+'");'+
                               'return true');
                a.setAttribute('onkeypress',
                               'readWiki("'+RegExp.$1+'");'+
                               'return true');
            }
            a.appendChild(document.createTextNode(key));
            appendNext(node, a);
            appendNext(a, document.createTextNode(right));
        }
        if (node.nodeValue.match(regexp)) {
            var left = RegExp.leftContext;
            var key = RegExp.lastMatch;
            var right = RegExp.rightContext;
            node.nodeValue = left;
            var a = document.createElement('a');
            a.setAttribute('href', '#'+encodeURIComponent(key));
            a.setAttribute('rel', 'nofollow');
            a.setAttribute('onclick',
                           'return readWiki("'+global_items[key].title+'");');
            a.setAttribute('onkeypress',
                           'return readWiki("'+global_items[key].title+'");');
            a.appendChild(document.createTextNode(key));
            appendNext(node, a);
            appendNext(a, document.createTextNode(right));
        }
    }
}

function loadByAJAX(form) {
    var xmlHttpObject = null;
    if(window.XMLHttpRequest) { // safari,firefox
        xmlHttpObject = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        try{
            xmlHttpObject = new ActiveXObject('Msxml2.XMLHTTP');
        }catch(e){
            try{
                xmlHttpObject = new ActiveXObject('Microsoft.XMLHTTP');
            }catch(e){
            }
        }
    }
    if (!xmlHttpObject) {
        return false;
    }
    xmlHttpObject.onreadystatechange = function() {
        if ((xmlHttpObject.readyState == 4) &&
            (xmlHttpObject.status == 200)) {
            //alert(xmlHttpObject.responseText);
            if (xmlHttpObject.responseXML) {
                var doc = xmlHttpObject.responseXML;
                var result = doc.getElementsByTagName('result')[0];
                if (result.getAttribute('error')!=0) {
                    return;
                }
                var items = result.getElementsByTagName('item');
                for (var i=0; i < items.length; i++) {
                    var item = {};
                    for (var j=0; j < fields.length; j++) {
                        var node = items[i].getElementsByTagName(fields[j])[0];
                        var key = node.nodeName;
                        var val = '';
                        for (var k=0; k < node.childNodes.length; k++) {
                            val += node.childNodes[k].nodeValue;
                        }
                        item[key] = val;
                    }
                    global_items[item.title] = item;
                }
                var keys = result.getElementsByTagName('key');
                for (var i=0;  i < keys.length; i++) {
                    var key = keys[i].childNodes[0].nodeValue;
                    if (!(key in global_items)) {
                        global_items[key] = {
                            title:key,
                            src:''
                        };
                    }
                }
            }
            if (form.command.value=='select') {
                if (global_items[form.title.value]) {
                    form.src.value = global_items[form.title.value].src;
                } else {
                    form.src.value = '';
                }
            }
            refresh();
        }
    };
    xmlHttpObject.open('POST', 'wiki.php', true);
    //xmlHttpObject.overrideMimeType('text/xml');
    xmlHttpObject.setRequestHeader('Content-Type',
                                   'application/x-www-form-urlencoded');
    var query = '';
    var inputs = form.getElementsByTagName('input');
    for (var i=0; i < inputs.length; i++) {
        if (query!='') {
            query += '&';
        }
        query += inputs[i].name + '=' + encodeURIComponent(inputs[i].value);
    }
    var textareas = form.getElementsByTagName('textarea');
    for (var i=0; i < textareas.length; i++) {
        if (query!='') {
            query += '&';
        }
        query += textareas[i].name + '=' + encodeURIComponent(textareas[i].value);
    }
    xmlHttpObject.send(query);
}

function refresh() {
    buildBlocks(document.getElementById('controll').src.value);
    return false;
}

function readWiki(title) {
    var form = document.getElementById('controll');
    if (title) {
        form.title.value = title;
    }
    if (!form.title.value) {
        if (decodeURIComponent(document.location.hash).match(/#(.+)/)) {
            form.title.value = RegExp.$1;
        }
    } else {
        document.location.hash = encodeURIComponent(form.title.value);
    }
    form.command.value='select';
    loadByAJAX(form);
    return false;
}

function writeWiki() {
    var form = document.getElementById('controll');
    if (form.title.value) {
        document.location.hash = encodeURIComponent(form.title.value);
    } else {
        return;
    }
    form.command.value='insert';
    loadByAJAX(form);
    return false;
}