(function (global) {
    'use strict';

    /**
     * Auto engine markers — no project invasion.
     * @constructor
     * @param {InstanceType<typeof PWPerfSampler>} sampler
     */
    function AutoMarkers(sampler) {
        this.sampler = sampler;
        this.enabledAssetSpike = true;
        this.assetSpikeThreshold = 20;
        this._cc = null;
        this._lastScene = '';
        this._bundles = {};
        this._lastAssetCount = 0;
        this._pollTimer = 0;
        this._boundScene = null;
    }

    /** @param {*} cc */
    AutoMarkers.prototype.bindEngine = function (cc) {
        var self = this;
        this._cc = cc;
        if (!cc) return;
        this.dispose();

        var director = cc.director;
        var Director = cc.Director;
        if (director && Director && Director.EVENT_AFTER_SCENE_LAUNCH) {
            this._boundScene = function () {
                var scene = director.getScene();
                var name = scene && scene.name ? scene.name : 'unknown';
                if (name !== self._lastScene) {
                    self._lastScene = name;
                    self.sampler.mark('scene:' + name);
                }
            };
            director.on(Director.EVENT_AFTER_SCENE_LAUNCH, this._boundScene);
        }

        var game = cc.game;
        var Game = cc.Game;
        if (game && Game) {
            if (!this._boundHide && Game.EVENT_HIDE) {
                this._boundHide = function () { self.sampler.mark('game:hide'); };
                game.on(Game.EVENT_HIDE, this._boundHide);
            }
            if (!this._boundShow && Game.EVENT_SHOW) {
                this._boundShow = function () { self.sampler.mark('game:show'); };
                game.on(Game.EVENT_SHOW, this._boundShow);
            }
        }

        this._pollTimer = setInterval(function () { self._poll(); }, 1000);
        this._poll();
    };

    /** Stop polling / listeners. */
    AutoMarkers.prototype.dispose = function () {
        if (this._pollTimer) {
            clearInterval(this._pollTimer);
            this._pollTimer = 0;
        }
        var cc = this._cc;
        if (cc && cc.director && this._boundScene && cc.Director) {
            cc.director.off(cc.Director.EVENT_AFTER_SCENE_LAUNCH, this._boundScene);
        }
        this._boundScene = null;
        if (cc && cc.game) {
            if (this._boundHide && cc.Game && cc.Game.EVENT_HIDE) cc.game.off(cc.Game.EVENT_HIDE, this._boundHide);
            if (this._boundShow && cc.Game && cc.Game.EVENT_SHOW) cc.game.off(cc.Game.EVENT_SHOW, this._boundShow);
        }
        this._boundHide = null;
        this._boundShow = null;
    };

    AutoMarkers.prototype._poll = function () {
        var cc = this._cc;
        if (!cc) return;

        var scene = cc.director && cc.director.getScene ? cc.director.getScene() : null;
        var name = scene && scene.name ? scene.name : '';
        if (name && name !== this._lastScene) {
            this._lastScene = name;
            this.sampler.mark('scene:' + name);
        }

        if (cc.assetManager && cc.assetManager.bundles) {
            var self = this;
            try {
                cc.assetManager.bundles.forEach(function (bundle, bundleName) {
                    var key = bundleName || (bundle && bundle.name) || '';
                    if (!key) return;
                    if (!self._bundles[key]) {
                        self._bundles[key] = true;
                        self.sampler.mark('bundle:' + key);
                    }
                });
            } catch (e) {
                console.warn('[Workbench] bundle poll failed', e);
            }
        }

        if (!this.enabledAssetSpike || !cc.assetManager || !cc.assetManager.assets) return;
        var assets = cc.assetManager.assets;
        var count = 0;
        if (typeof assets.size === 'number' && isFinite(assets.size)) {
            count = assets.size;
        } else {
            try {
                assets.forEach(function () { count += 1; });
            } catch (e2) {
                return;
            }
        }
        if (this._lastAssetCount > 0) {
            var delta = count - this._lastAssetCount;
            if (delta >= this.assetSpikeThreshold) {
                this.sampler.mark('assets:+' + delta);
            }
        }
        this._lastAssetCount = count;
    };

    global.PWAutoMarkers = AutoMarkers;
})(window);