/**
 * editor_plugin_src.js
 *
 * Copyright 2009, Moxiecode Systems AB
 * Released under LGPL License.
 *
 * License: http://tinymce.moxiecode.com/license
 * Contributing: http://tinymce.moxiecode.com/contributing
 */

(function() {
    function findParentLayer(node) {
        do {
            if (node.className && node.className.indexOf('mceItemLayer') != -1) {
                return node;
            }
        } while (node = node.parentNode);
    };

    tinymce.create('tinymce.plugins.Layer', {
        init : function(ed, url) {
            var t = this;

            t.editor = ed;

            // Register commands
            ed.addCommand('mceInsertLayer', t._insertLayer, t);

            ed.addCommand('mceMoveForward', function() {
                t._move(1);
            });

            ed.addCommand('mceMoveBackward', function() {
                t._move(-1);
            });

            ed.addCommand('mceMakeAbsolute', function() {
                t._toggleAbsolute();
            });

            // Register buttons
            ed.addButton('moveforward', {title : 'layer.forward_desc', cmd : 'mceMoveForward'});
            ed.addButton('movebackward', {title : 'layer.backward_desc', cmd : 'mceMoveBackward'});
            ed.addButton('absolute', {title : 'layer.absolute_desc', cmd : 'mceMakeAbsolute'});
            ed.addButton('insertlayer', {title : 'layer.insertlayer_desc', cmd : 'mceInsertLayer'});

            ed.onInit.add(function() {
                var dom = ed.dom;

                if (tinymce.isIE)
                    ed.getDoc().execCommand('2D-Position', false, true);
            });

            // Remove serialized styles when selecting a layer since it might be changed by a drag operation
            ed.onMouseUp.add(function(ed, e) {
                var layer = findParentLayer(e.target);
    
                if (layer) {
                    ed.dom.setAttrib(layer, 'data-mce-style', '');
                }
            });

            // Fixes edit focus issues with layers on Gecko
            // This will enable designMode while inside a layer and disable it when outside
            ed.onMouseDown.add(function(ed, e) {
                var node = e.target, doc = ed.getDoc(), parent;

                if (tinymce.isGecko) {
                    if (findParentLayer(node)) {
                        if (doc.designMode !== 'on') {
                            doc.designMode = 'on';

                            // Repaint caret
                            node = doc.body;
                            parent = node.parentNode;
                            parent.removeChild(node);
                            parent.appendChild(node);
                        }
                    } else if (doc.designMode == 'on') {
                        doc.designMode = 'off';
                    }
                }
            });

            ed.onNodeChange.add(t._nodeChange, t);
            ed.onVisualAid.add(t._visualAid, t);
        },

        getInfo : function() {
            return {
                longname : 'Layer',
                author : 'Moxiecode Systems AB',
                authorurl : 'http://tinymce.moxiecode.com',
                infourl : 'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/layer',
                version : tinymce.majorVersion + "." + tinymce.minorVersion
            };
        },

        // Private methods

        _nodeChange : function(ed, cm, n) {
            var le, p;

            le = this._getParentLayer(n);
            p = ed.dom.getParent(n, 'DIV,P,IMG');

            if (!p) {
                cm.setDisabled('absolute', 1);
                cm.setDisabled('moveforward', 1);
                cm.setDisabled('movebackward', 1);
            } else {
                cm.setDisabled('absolute', 0);
                cm.setDisabled('moveforward', !le);
                cm.setDisabled('movebackward', !le);
                cm.setActive('absolute', le && le.style.position.toLowerCase() == "absolute");
            }
        },

        // Private methods

        _visualAid : function(ed, e, s) {
            var dom = ed.dom;

            tinymce.each(dom.select('div,p', e), function(e) {
                if (/^(absolute|relative|fixed)$/i.test(e.style.position)) {
                    if (s)
                        dom.addClass(e, 'mceItemVisualAid');
                    else
                        dom.removeClass(e, 'mceItemVisualAid');

                    dom.addClass(e, 'mceItemLayer');
                }
            });
        },

        _move : function(d) {
            var ed = this.editor, i, z = [], le = this._getParentLayer(ed.selection.getNode()), ci = -1, fi = -1, nl;

            nl = [];
            tinymce.walk(ed.getBody(), function(n) {
                if (n.nodeType == 1 && /^(absolute|relative|static)$/i.test(n.style.position))
                    nl.push(n); 
            }, 'childNodes');

            // Find z-indexes
            for (i=0; i<nl.length; i++) {
                z[i] = nl[i].style.zIndex ? parseInt(nl[i].style.zIndex) : 0;

                if (ci < 0 && nl[i] == le)
                    ci = i;
            }

            if (d < 0) {
                // Move back

                // Try find a lower one
                for (i=0; i<z.length; i++) {
                    if (z[i] < z[ci]) {
                        fi = i;
                        break;
                    }
                }

                if (fi > -1) {
                    nl[ci].style.zIndex = z[fi];
                    nl[fi].style.zIndex = z[ci];
                } else {
                    if (z[ci] > 0)
                        nl[ci].style.zIndex = z[ci] - 1;
                }
            } else {
                // Move forward

                // Try find a higher one
                for (i=0; i<z.length; i++) {
                    if (z[i] > z[ci]) {
                        fi = i;
                        break;
                    }
                }

                if (fi > -1) {
                    nl[ci].style.zIndex = z[fi];
                    nl[fi].style.zIndex = z[ci];
                } else
                    nl[ci].style.zIndex = z[ci] + 1;
            }

            ed.execCommand('mceRepaint');
        },

        _getParentLayer : function(n) {
            return this.editor.dom.getParent(n, function(n) {
                return n.nodeType == 1 && /^(absolute|relative|static)$/i.test(n.style.position);
            });
        },

        _insertLayer : function() {
            var ed = this.editor, dom = ed.dom, p = dom.getPos(dom.getParent(ed.selection.getNode(), '*')), body = ed.getBody();

            ed.dom.add(body, 'div', {
                style : {
                    position : 'absolute',
                    left : p.x,
                    top : (p.y > 20 ? p.y : 20),
                    width : 100,
                    height : 100
                },
                'class' : 'mceItemVisualAid mceItemLayer'
            }, ed.selection.getContent() || ed.getLang('layer.content'));

            // Workaround for IE where it messes up the JS engine if you insert a layer on IE 6,7
            if (tinymce.isIE)
                dom.setHTML(body, body.innerHTML);
        },

        _toggleAbsolute : function() {
            var ed = this.editor, le = this._getParentLayer(ed.selection.getNode());

            if (!le)
                le = ed.dom.getParent(ed.selection.getNode(), 'DIV,P,IMG');

            if (le) {
                if (le.style.position.toLowerCase() == "absolute") {
                    ed.dom.setStyles(le, {
                        position : '',
                        left : '',
                        top : '',
                        width : '',
                        height : ''
                    });

                    ed.dom.removeClass(le, 'mceItemVisualAid');
                    ed.dom.removeClass(le, 'mceItemLayer');
                } else {
                    if (le.style.left == "")
                        le.style.left = 20 + 'px';

                    if (le.style.top == "")
                        le.style.top = 20 + 'px';

                    if (le.style.width == "")
                        le.style.width = le.width ? (le.width + 'px') : '100px';

                    if (le.style.height == "")
                        le.style.height = le.height ? (le.height + 'px') : '100px';

                    le.style.position = "absolute";

                    ed.dom.setAttrib(le, 'data-mce-style', '');
                    ed.addVisual(ed.getBody());
                }

                ed.execCommand('mceRepaint');
                ed.nodeChanged();
            }
        }
    });

    // Register plugin
    tinymce.PluginManager.add('layer', tinymce.plugins.Layer);
})();