/* <copyright>
 This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
 No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
 (c) Copyright 2012 Motorola Mobility, Inc.  All Rights Reserved.
 </copyright> */
/**
    @module "montage/ui/dynamic-element.reel"
    @requires montage
    @requires montage/ui/component
*/
var Montage = require("montage").Montage,
    Component = require("ui/component").Component;

/**
    The DynamicElement is a general purpose component that aims to expose all the properties of the element as a component.
    @class module:"montage/ui/dynamic-element.reel".DynamicElement
    @extends module:montage/ui/component.Component
*/
exports.DynamicElement = Montage.create(Component, /** @lends module:"montage/ui/dynamic-element.reel".DynamicElement# */ {

    hasTemplate: {
        value: false
    },

    _innerHTML: {
        value: null
    },

    /**
        The innerHTML displayed as the content of the DynamicElement
        @type {Property}
        @default null
    */
    innerHTML: {
        get: function() {
            return this._innerHTML;
        },
        set: function(value) {
            if (this._innerHTML !== value) {
                this._innerHTML = value;
                this.needsDraw = true;
            }
        },
        serializable: true
    },

    /**
        The default html displayed if innerHTML is falsy.
        @type {Property}
        @default {String} ""
    */
    defaultHTML: {
        value: ""
    },

    _allowedTagNames: {
        value: null
    },

    /**
        White list of allowed tags in the innerHTML
        @type {Property}
        @default null
    */
    allowedTagNames: {
        get: function() {
            return this._allowedTagNames;
        },
        set: function(value) {
            if (this._allowedTagNames !== value) {
                this._allowedTagNames = value;
                this.needsDraw = true;
            }
        },
        serializable: true
    },


    _classList: {
        value: null
    },

    _classListDirty: {
        value: false
    },

    /**
        The classList of the component's element, the purpose is to mimic the element's API but to also respect the draw.
        It can also be bound to by binding each class as a property.
        example to toggle the complete class: "classList.complete" : { "<-" : "@owner.isCompete"}
        @type {Property}
        @default null
    */
    classList: {
        get: function() {
            if (this._classList === null) {
                var className = this.element.className;
                this._classList = ClassList.newWithComponent(this, (className.length !== 0 ? this.element.className.split(" ") : null));
            }
            return this._classList;
        }
    },


    _range: {
        value: null
    },

    prepareForDraw: {
        value: function() {
            var range = document.createRange();
            range.selectNodeContents(this.element);
            this._range = range;
        }
    },

    _contentNode: {
        value: null
    },

    draw: {
        value: function() {
            // get correct value
            var displayValue = (this.innerHTML || 0 === this.innerHTML ) ? this.innerHTML : this.defaultHTML,
                content, allowedTagNames = this.allowedTagNames, range = this._range, elements;

            //push to DOM
            if (allowedTagNames !== null) {
                //cleanup
                this._contentNode = null;
                range.deleteContents();
                //test for tag white list
                content = range.createContextualFragment( displayValue );
                if(allowedTagNames.length !== 0) {
                    elements = content.querySelectorAll("*:not(" + allowedTagNames.join("):not(") + ")");
                } else {
                    elements = content.childNodes;
                }
                if (elements.length === 0) {
                    range.insertNode(content);
                    if(range.endOffset === 0) {
                        // according to https://bugzilla.mozilla.org/show_bug.cgi?id=253609 Firefox keeps a collapsed
                        // range collapsed after insertNode
                        range.selectNodeContents(this.element);
                    }

                } else {
                    console.warn("Some Elements Not Allowed " , elements);
                }
            } else {
                content = this._contentNode;
                if(content === null) {
                    //cleanup
                    range.deleteContents();
                    this._contentNode = content = document.createTextNode(displayValue);
                    range.insertNode(content);
                    if(range.endOffset === 0) {
                        // according to https://bugzilla.mozilla.org/show_bug.cgi?id=253609 Firefox keeps a collapsed
                        // range collapsed after insert
                        range.selectNodeContents(this.element);
                    }

                } else {
                    content.data = displayValue;
                }
            }
            // classList
            if (this._classListDirty) {
                this.classList.drawIntoComponent();
                this._classListDirty = false;
            }
        }
    }

});

var ClassList = Montage.create(Montage, {

    newWithComponent: {
        value: function(component, classes) {
            var aClassList = ClassList.create(),
                aClass, i = 0;
            aClassList._component = component;
            aClassList._classes = {};
            if (classes !== null) {
                while (aClass =  classes[i++]) {
                    aClassList.add(aClass);
                }
            }

            return aClassList;
        }
    },

    __dirty__: {
        value: false
    },

    _component: {
        value: null
    },

    _classes: {
        value: null
    },

    _installCssClass: {
        value: function(key) {
            this._classes[key] = false;
            Montage.defineProperty(this, key, {
                get: function() {
                    return this._classes[key];
                },
                set: function(value) {
                    value = !!value;
                    if(value !== this._classes[key]) {
                        this._classes[key] = value;
                        this._component._classListDirty = true;
                        this._component.needsDraw = true;
                    }
                }
            });
        }
    },

    add: {
        value: function(key) {
            this.undefinedSet(key, true);
        }
    },

    remove: {
        value: function(key) {
            this.undefinedSet(key, false);
        }
    },

    toggle: {
        value: function(key) {
            this.undefinedSet(key, !this.undefinedGet(key));
        }
    },

    contains: {
        value: function(key) {
            return !!this._classes[key];
        }
    },

    undefinedGet: {
        value: function(key) {
            if (typeof this[key] === "undefined") {
                this._installCssClass(key);
            }
            return this[key];
        }
    },

    undefinedSet: {
        value: function(key, value) {
            if (typeof this[key] === "undefined") {
                this._installCssClass(key);
            }
            this[key] = value;
        }
    },

    drawIntoComponent: {
        value: function() {
            var classes = this._classes,
                classList = this._component.element.classList,
                cssClass;
            for (cssClass in classes) {
                if (classes.hasOwnProperty(cssClass)) {
                    if(classes[cssClass]) {
                        classList.add(cssClass);
                    } else {
                        classList.remove(cssClass);
                    }
                }
            }

        }
    }

});