/**
 * @singleton
 * @private
 */
Ext.define('Ext.perf.Monitor', {
    singleton: true,
    alternateClassName: 'Ext.Perf',
 
    requires: [
        'Ext.perf.Accumulator'
    ],
 
    constructor: function () {
        this.accumulators = [];
        this.accumulatorsByName = {};
    },
 
    calibrate: function () {
        var accum = new Ext.perf.Accumulator('$'),
            total = accum.total,
            getTimestamp = Ext.perf.Accumulator.getTimestamp,
            count = 0,
            frame,
            endTime,
            startTime;
 
        startTime = getTimestamp();
 
        do {
            frame = accum.enter();
            frame.leave();
            ++count;
        } while (total.sum < 100);
 
        endTime = getTimestamp();
 
        return (endTime - startTime) / count;
    },
 
    get: function (name) {
        var me = this,
            accum = me.accumulatorsByName[name];
 
        if (!accum) {
            me.accumulatorsByName[name] = accum = new Ext.perf.Accumulator(name);
            me.accumulators.push(accum);
        }
 
        return accum;
    },
 
    enter: function (name) {
        return this.get(name).enter();
    },
 
    monitor: function (name, fn, scope) {
        this.get(name).monitor(fn, scope);
    },
 
    report: function () {
        var me = this,
            accumulators = me.accumulators,
            calibration = me.calibrate();
 
        accumulators.sort(function (a, b) {
            return (a.name < b.name) ? -1 : ((b.name < a.name) ? 1 : 0);
        });
 
        me.updateGC();
 
        Ext.log('Calibration: ' + Math.round(calibration * 100) / 100 + ' msec/sample');
        Ext.each(accumulators, function (accum) {
            Ext.log(accum.format(calibration));
        });
    },
 
    getData: function (all) {
        var ret = {},
            accumulators = this.accumulators;
 
        Ext.each(accumulators, function (accum) {
            if (all || accum.count) {
                ret[accum.name] = accum.getData();
            }
        });
 
        return ret;
    },
 
    reset: function(){
        Ext.each(this.accumulators, function(accum){
            var me = accum;
            me.count = me.childCount = me.depth = me.maxDepth = 0;
            me.pure = {
                min: Number.MAX_VALUE,
                max: 0,
                sum: 0
            };
            me.total = {
                min: Number.MAX_VALUE,
                max: 0,
                sum: 0
            };
        });
    },
 
    updateGC: function () {
        var accumGC = this.accumulatorsByName.GC,
            toolbox = Ext.senchaToolbox,
            bucket;
 
        if (accumGC) {
            accumGC.count = toolbox.garbageCollectionCounter || 0;
 
            if (accumGC.count) {
                bucket = accumGC.pure;
                accumGC.total.sum = bucket.sum = toolbox.garbageCollectionMilliseconds;
                bucket.min = bucket.max = bucket.sum / accumGC.count;
                bucket = accumGC.total;
                bucket.min = bucket.max = bucket.sum / accumGC.count;
            }
        }
    },
 
    watchGC: function () {
        Ext.perf.getTimestamp(); // initializes SenchaToolbox (if available) 
 
        var toolbox = Ext.senchaToolbox;
 
        if (toolbox) {
            this.get("GC");
            toolbox.watchGarbageCollector(false); // no logging, just totals 
        }
    },
 
    setup: function (config) {
        if (!config) {
            config = {
                /*insertHtml: {
                    'Ext.dom.Helper': 'insertHtml'
                },*/
                /*xtplCompile: {
                    'Ext.XTemplateCompiler': 'compile'
                },*/
//                doInsert: { 
//                    'Ext.Template': 'doInsert' 
//                }, 
//                applyOut: { 
//                    'Ext.XTemplate': 'applyOut' 
//                }, 
                render: {
                    'Ext.Component': 'render'
                },
//                fnishRender: { 
//                    'Ext.Component': 'finishRender' 
//                }, 
//                renderSelectors: { 
//                    'Ext.Component': 'applyRenderSelectors' 
//                }, 
//                compAddCls: { 
//                    'Ext.Component': 'addCls' 
//                }, 
//                compRemoveCls: { 
//                    'Ext.Component': 'removeCls' 
//                }, 
//                getStyle: { 
//                    'Ext.core.Element': 'getStyle' 
//                }, 
//                setStyle: { 
//                    'Ext.core.Element': 'setStyle' 
//                }, 
//                addCls: { 
//                    'Ext.core.Element': 'addCls' 
//                }, 
//                removeCls: { 
//                    'Ext.core.Element': 'removeCls' 
//                }, 
//                measure: { 
//                    'Ext.layout.component.Component': 'measureAutoDimensions' 
//                }, 
//                moveItem: { 
//                    'Ext.layout.Layout': 'moveItem' 
//                }, 
//                layoutFlush: { 
//                    'Ext.layout.Context': 'flush' 
//                }, 
                layout: {
                    'Ext.layout.Context': 'run'
                }
            };
        }
 
        this.currentConfig = config;
 
        var key, prop,
            accum, className, methods;
        for (key in config) {
            if (config.hasOwnProperty(key)) {
                prop = config[key];
                accum = Ext.Perf.get(key);
 
                for (className in prop) {
                    if (prop.hasOwnProperty(className)) {
                        methods = prop[className];
                        accum.tap(className, methods);
                    }
                }
            }
        }
 
        this.watchGC();
    }
});