SnapSerializer.prototype.app = 'TurtleStitch 2.0, http://www.turtlestitch.org';
SnapSerializer.prototype.thumbnailSize = new Point(480, 360);

SnapSerializer.prototype.openProject = function (project, ide) {
    var stage = ide.stage,
        sprites = [],
        sprite;
    if (!project || !project.stage) {
        return;
    }
    ide.projectName = project.name;
    ide.projectNotes = project.notes || '';
    ide.origName = project.origName || '';
    ide.origCreator = project.origCreator || '';
    ide.creator = project.creator || '';
    ide.remixHistory = project.remixHistorycreat || '';
    //console.log("name: " + ide.projectName + ", creator: " + ide.creator + ", origName: " + ide.origName + ", origCreator: " + ide.origCreator);    
    if (ide.globalVariables) {
        ide.globalVariables = project.globalVariables;
    }
    if (stage) {
        stage.destroy();
    }
    ide.add(project.stage);
    ide.stage = project.stage;
    sprites = ide.stage.children.filter(function (child) {
        return child instanceof SpriteMorph;
    });
    sprites.sort(function (x, y) {
        return x.idx - y.idx;
    });

    ide.sprites = new List(sprites);
    sprite = sprites[0] || project.stage;

    if (sizeOf(this.mediaDict) > 0) {
        ide.hasChangedMedia = false;
        this.mediaDict = {};
    } else {
        ide.hasChangedMedia = true;
    }
    project.stage.drawNew();
    ide.createCorral();
    ide.selectSprite(sprite);
    ide.fixLayout();

    // force watchers to update
    //project.stage.watchers().forEach(function (watcher) {
    //  watcher.onNextStep = function () {this.currentValue = null;};
    //})

    ide.world().keyboardReceiver = project.stage;
    ide.stage.initCamera();
};

SnapSerializer.prototype.rawLoadProjectModel = function (xmlNode) {
    // private
    var myself = this,
        project = {sprites: {}},
        model,
        nameID;

    this.project = project;

    model = {project: xmlNode };
    if (+xmlNode.attributes.version > this.version) {
        throw 'Project uses newer version of Serializer';
    }

    /* Project Info */

    this.objects = {};
    project.name = model.project.attributes.name;
    project.origName = model.project.childNamed('origName') ? model.project.childNamed('origName').contents : ""
    project.creator =  model.project.childNamed('creator') ? model.project.childNamed('creator').contents : ""
    project.origCreator =  model.project.childNamed('origCreator') ? model.project.childNamed('origCreator').contents : ""
    project.remixHistory =  model.project.childNamed('origCreator') ? model.project.childNamed('origCreator').contents : ""

    if (!project.name) {
        nameID = 1;
        while (
            Object.prototype.hasOwnProperty.call(
                localStorage,
                '-snap-project-Untitled ' + nameID
            )
        ) {
            nameID += 1;
        }
        project.name = 'Untitled ' + nameID;
    }
    model.notes = model.project.childNamed('notes');
    if (model.notes) {
        project.notes = model.notes.contents;
    }
    model.globalVariables = model.project.childNamed('variables');
    project.globalVariables = new VariableFrame();

    /* Stage */

    model.stage = model.project.require('stage');
    StageMorph.prototype.frameRate = 0;
    project.stage = new StageMorph(project.globalVariables);
    if (Object.prototype.hasOwnProperty.call(
            model.stage.attributes,
            'id'
        )) {
        this.objects[model.stage.attributes.id] = project.stage;
    }
    if (model.stage.attributes.name) {
        project.stage.name = model.stage.attributes.name;
    }
    if (model.stage.attributes.scheduled === 'true') {
        project.stage.fps = 30;
        StageMorph.prototype.frameRate = 30;
    }
    model.pentrails = model.stage.childNamed('pentrails');
    if (model.pentrails) {
        project.pentrails = new Image();
        project.pentrails.onload = function () {
            if (project.stage.trailsCanvas) { // work-around a bug in FF
                normalizeCanvas(project.stage.trailsCanvas);
                var context = project.stage.trailsCanvas.getContext('2d');
                if (context) context.drawImage(project.pentrails, 0, 0);
                project.stage.changed();
            }
        };
        project.pentrails.src = model.pentrails.contents;
    }
    project.stage.setTempo(model.stage.attributes.tempo);
    StageMorph.prototype.dimensions = new Point(480, 360);
    if (model.stage.attributes.width) {
        StageMorph.prototype.dimensions.x =
            Math.max(+model.stage.attributes.width, 480);
    }
    if (model.stage.attributes.height) {
        StageMorph.prototype.dimensions.y =
            Math.max(+model.stage.attributes.height, 180);
    }
    project.stage.setExtent(StageMorph.prototype.dimensions);
    SpriteMorph.prototype.useFlatLineEnds =
        model.stage.attributes.lines === 'flat';
    BooleanSlotMorph.prototype.isTernary =
        model.stage.attributes.ternary !== 'false';
    project.stage.isThreadSafe =
        model.stage.attributes.threadsafe === 'true';
    StageMorph.prototype.enableCodeMapping =
        model.stage.attributes.codify === 'true';
    StageMorph.prototype.enableInheritance =
        model.stage.attributes.inheritance !== 'false';
    StageMorph.prototype.enableSublistIDs =
        model.stage.attributes.sublistIDs === 'true';

    model.hiddenPrimitives = model.project.childNamed('hidden');
    if (model.hiddenPrimitives) {
        model.hiddenPrimitives.contents.split(' ').forEach(
            function (sel) {
                if (sel) {
                    StageMorph.prototype.hiddenPrimitives[sel] = true;
                }
            }
        );
    }

    model.codeHeaders = model.project.childNamed('headers');
    if (model.codeHeaders) {
        model.codeHeaders.children.forEach(function (xml) {
            StageMorph.prototype.codeHeaders[xml.tag] = xml.contents;
        });
    }

    model.codeMappings = model.project.childNamed('code');
    if (model.codeMappings) {
        model.codeMappings.children.forEach(function (xml) {
            StageMorph.prototype.codeMappings[xml.tag] = xml.contents;
        });
    }

    model.globalBlocks = model.project.childNamed('blocks');
    if (model.globalBlocks) {
        this.loadCustomBlocks(project.stage, model.globalBlocks, true);
        this.populateCustomBlocks(
            project.stage,
            model.globalBlocks,
            true
        );
    }
    this.loadObject(project.stage, model.stage);

    /* Sprites */

    model.sprites = model.stage.require('sprites');
    project.sprites[project.stage.name] = project.stage;

    model.sprites.childrenNamed('sprite').forEach(function (model) {
        myself.loadValue(model);
    });

    // restore inheritance and nesting associations
    myself.project.stage.children.forEach(function (sprite) {
        var exemplar, anchor;
        if (sprite.inheritanceInfo) { // only sprites can inherit
            exemplar = myself.project.sprites[
                sprite.inheritanceInfo.exemplar
            ];
            if (exemplar) {
                sprite.setExemplar(exemplar);
            }
            sprite.inheritedAttributes = sprite.inheritanceInfo.delegated || [];
        }
        if (sprite.nestingInfo) { // only sprites may have nesting info
            anchor = myself.project.sprites[sprite.nestingInfo.anchor];
            if (anchor) {
                anchor.attachPart(sprite);
            }
            sprite.rotatesWithAnchor = (sprite.nestingInfo.synch === 'true');
        }
    });
    myself.project.stage.children.forEach(function (sprite) {
        var costume;
        if (sprite.nestingInfo) { // only sprites may have nesting info
            sprite.nestingScale = +(sprite.nestingInfo.scale || sprite.scale);
            delete sprite.nestingInfo;
        }
        ['scripts', 'costumes', 'sounds'].forEach(function (att) {
            if (sprite.inheritsAttribute(att)) {
                sprite.refreshInheritedAttribute(att);
            }
        });
        if (sprite.inheritsAttribute('costumes')) {
            costume = sprite.costumes.asArray()[
                sprite.inheritanceInfo.costumeNumber - 1
            ];
            if (costume) {
                if (costume.loaded) {
                    sprite.wearCostume(costume, true);
                } else {
                    costume.loaded = function () {
                        sprite.wearCostume(costume, true);
                        this.loaded = true;
                    };
                }
            }
        }
        delete sprite.inheritanceInfo;
    });

    /* Global Variables */

    if (model.globalVariables) {
        this.loadVariables(
            project.globalVariables,
            model.globalVariables
        );
    }

    this.objects = {};

    /* Watchers */

    model.sprites.childrenNamed('watcher').forEach(function (model) {
        var watcher, color, target, hidden, extX, extY;

        color = myself.loadColor(model.attributes.color);
        target = Object.prototype.hasOwnProperty.call(
            model.attributes,
            'scope'
        ) ? project.sprites[model.attributes.scope] : null;

        // determine whether the watcher is hidden, slightly
        // complicated to retain backward compatibility
        // with former tag format: hidden="hidden"
        // now it's: hidden="true"
        hidden = Object.prototype.hasOwnProperty.call(
            model.attributes,
            'hidden'
        ) && (model.attributes.hidden !== 'false');

        if (Object.prototype.hasOwnProperty.call(
                model.attributes,
                'var'
            )) {
            watcher = new WatcherMorph(
                model.attributes['var'],
                color,
                isNil(target) ? project.globalVariables
                    : target.variables,
                model.attributes['var'],
                hidden
            );
        } else {
            watcher = new WatcherMorph(
                localize(myself.watcherLabels[model.attributes.s]),
                color,
                target,
                model.attributes.s,
                hidden
            );
        }
        watcher.setStyle(model.attributes.style || 'normal');
        if (watcher.style === 'slider') {
            watcher.setSliderMin(model.attributes.min || '1', true);
            watcher.setSliderMax(model.attributes.max || '100', true);
        }
        watcher.setPosition(
            project.stage.topLeft().add(new Point(
                +model.attributes.x || 0,
                +model.attributes.y || 0
            ))
        );
        project.stage.add(watcher);
        watcher.onNextStep = function () {this.currentValue = null; };

        // set watcher's contentsMorph's extent if it is showing a list and
        // its monitor dimensions are given
        if (watcher.currentValue instanceof List) {
            extX = model.attributes.extX;
            if (extX) {
                watcher.cellMorph.contentsMorph.setWidth(+extX);
            }
            extY = model.attributes.extY;
            if (extY) {
                watcher.cellMorph.contentsMorph.setHeight(+extY);
            }
            // adjust my contentsMorph's handle position
            watcher.cellMorph.contentsMorph.handle.drawNew();
        }
    });

    // clear sprites' inherited methods caches, if any
    myself.project.stage.children.forEach(function (sprite) {
        sprite.inheritedMethodsCache = [];
    });

    this.objects = {};
    return project;
};


StageMorph.prototype.toXML = function (serializer) {
    var thumbnail = normalizeCanvas(
            this.thumbnail(SnapSerializer.prototype.thumbnailSize),
            true
        ),
        thumbdata,
        ide = this.parentThatIsA(IDE_Morph);

    // catch cross-origin tainting exception when using SVG costumes
    try {
        thumbdata = thumbnail.toDataURL('image/png');
    } catch (error) {
        thumbdata = null;
    }

    function code(key) {
        var str = '';
        Object.keys(StageMorph.prototype[key]).forEach(
            function (selector) {
                str += (
                    '<' + selector + '>' +
                        XML_Element.prototype.escape(
                            StageMorph.prototype[key][selector]
                        ) +
                        '</' + selector + '>'
                );
            }
        );
        return str;
    }

    this.removeAllClones();
    return serializer.format(
        '<project name="@" app="@" version="@">\n' +
            '<notes>$</notes>\n' +
            '<creator>$</creator>\n' +
            '<origCreator>$</origCreator>\n' +
            '<origName>$</origName>\n' +
            '<remixHistory>$</remixHistory>\n' +
            '<thumbnail>$</thumbnail>\n' +
            '<stage name="@" width="@" height="@" ' +
            'costume="@" tempo="@" threadsafe="@" ' +
            '%' +
            'lines="@" ' +
            'ternary="@" ' +
            'codify="@" ' +
            'inheritance="@" ' +
            'sublistIDs="@" ' +
            'scheduled="@" ~>' +
            '<pentrails>$</pentrails>' +
            '<costumes>%</costumes>' +
            '<sounds>%</sounds>' +
            '<variables>%</variables>' +
            '<blocks>%</blocks>' +
            '<scripts>%</scripts><sprites>%</sprites>' +
            '</stage>\n' +
            '<hidden>$</hidden>' +
            '<headers>%</headers>' +
            '<code>%</code>' +
            '<blocks>%</blocks>' +
            '<variables>%</variables>\n' +
            '</project>',
        (ide && ide.projectName) ? ide.projectName : localize('Untitled'),  
        serializer.app,
        serializer.version,
        (ide && ide.projectNotes) ? ide.projectNotes : '',
        (ide && ide.creator) ? ide.creator : '',
        (ide && ide.origCreator) ? ide.origCreator : '',
        (ide && ide.origName) ? ide.origName : '',
        (ide && ide.remixHistory) ? ide.remixHistory : '',
        thumbdata,
        this.name,
        StageMorph.prototype.dimensions.x,
        StageMorph.prototype.dimensions.y,
        this.getCostumeIdx(),
        this.getTempo(),
        this.isThreadSafe,
        this.instrument ?
                ' instrument="' + parseInt(this.instrument) + '" ' : '',
        SpriteMorph.prototype.useFlatLineEnds ? 'flat' : 'round',
        BooleanSlotMorph.prototype.isTernary,
        this.enableCodeMapping,
        this.enableInheritance,
        this.enableSublistIDs,
        StageMorph.prototype.frameRate !== 0,
        normalizeCanvas(this.trailsCanvas, true).toDataURL('image/png'),
        serializer.store(this.costumes, this.name + '_cst'),
        serializer.store(this.sounds, this.name + '_snd'),
        serializer.store(this.variables),
        serializer.store(this.customBlocks),
        serializer.store(this.scripts),
        serializer.store(this.children),
        Object.keys(StageMorph.prototype.hiddenPrimitives).reduce(
                function (a, b) {return a + ' ' + b; },
                ''
            ),
        code('codeHeaders'),
        code('codeMappings'),
        serializer.store(this.globalBlocks),
        (ide && ide.globalVariables) ?
                    serializer.store(ide.globalVariables) : ''
    );
};

XML_Serializer.prototype.serialize = function (object, forBlocksLibrary) {
    // public: answer an XML string representing the given object
    var xml;
    this.flush(); // in case an error occurred in an earlier attempt
    this.flushMedia();
    this.isExportingBlocksLibrary = forBlocksLibrary;
    xml = this.store(object);
    this.flush();
    return xml;
};