"use strict";

var BABYLON = BABYLON || {};

(function () {
    BABYLON.Tools = {};

    BABYLON.Tools.ExtractMinAndMax = function (positions, start, count) {
        var minimum = new BABYLON.Vector3(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
        var maximum = new BABYLON.Vector3(-Number.MAX_VALUE, -Number.MAX_VALUE, -Number.MAX_VALUE);

        for (var index = start; index < start + count; index++) {
            var current = new BABYLON.Vector3(positions[index * 3], positions[index * 3 + 1], positions[index * 3 + 2]);

            minimum = BABYLON.Vector3.Minimize(current, minimum);
            maximum = BABYLON.Vector3.Maximize(current, maximum);
        }

        return {
            minimum: minimum,
            maximum: maximum
        };
    };

    // Smart array
    BABYLON.Tools.SmartArray = function(capacity) {
        this.data = new Array(capacity);
        this.length = 0;
    };

    BABYLON.Tools.SmartArray.prototype.push = function(value) {
        this.data[this.length++] = value;
        
        if (this.length > this.data.length) {
            this.data.length *= 2;
        }
    };

    BABYLON.Tools.SmartArray.prototype.pushNoDuplicate = function(value) {
        if (this.indexOf(value) > -1) {
            return;
        }
        this.push(value);
    };
    
    BABYLON.Tools.SmartArray.prototype.sort = function (compareFn) {
        this.data.sort(compareFn);
    };

    BABYLON.Tools.SmartArray.prototype.reset = function() {
        this.length = 0;
    };
    
    BABYLON.Tools.SmartArray.prototype.concat = function (array) {
        if (array.length === 0) {
            return;
        }
        if (this.length + array.length > this.data.length) {
            this.data.length = (this.length + array.length) * 2;
        }

        for (var index = 0; index < array.length; index++) {
            this.data[this.length++] = (array.data || array)[index];
        }
    };
    
    BABYLON.Tools.SmartArray.prototype.concatWithNoDuplicate = function (array) {
        if (array.length === 0) {
            return;
        }
        if (this.length + array.length > this.data.length) {
            this.data.length = (this.length + array.length) * 2;
        }

        for (var index = 0; index < array.length; index++) {
            var item = (array.data || array)[index];
            var pos = this.data.indexOf(item);

            if (pos === -1 ||pos >= this.length) {
                this.data[this.length++] = item;
            }
        }
    };
    
    BABYLON.Tools.SmartArray.prototype.indexOf = function (value) {
        var position = this.data.indexOf(value);
        
        if (position >= this.length) {
            return -1;
        }

        return position;
    };

    // Misc.
    BABYLON.Tools.GetPointerPrefix = function() {
        var eventPrefix = "pointer";

        // Check if hand.js is referenced or if the browser natively supports pointer events
        if (!navigator.pointerEnabled) {
            eventPrefix = "mouse";
        }

        return eventPrefix;
    };

    BABYLON.Tools.QueueNewFrame = function (func) {
        if (window.requestAnimationFrame)
            window.requestAnimationFrame(func);
        else if (window.msRequestAnimationFrame)
            window.msRequestAnimationFrame(func);
        else if (window.webkitRequestAnimationFrame)
            window.webkitRequestAnimationFrame(func);
        else if (window.mozRequestAnimationFrame)
            window.mozRequestAnimationFrame(func);
        else if (window.oRequestAnimationFrame)
            window.oRequestAnimationFrame(func);
        else {
            window.setTimeout(func, 16);
        }
    };

    BABYLON.Tools.RequestFullscreen = function (element) {
        if (element.requestFullscreen)
            element.requestFullscreen();
        else if (element.msRequestFullscreen)
            element.msRequestFullscreen();
        else if (element.webkitRequestFullscreen)
            element.webkitRequestFullscreen();
        else if (element.mozRequestFullScreen)
            element.mozRequestFullScreen();        
    };

    BABYLON.Tools.ExitFullscreen = function () {
        if (document.exitFullscreen) {
            document.exitFullscreen();
        }
        else if (document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
        }
        else if (document.webkitCancelFullScreen) {
            document.webkitCancelFullScreen();
        }
        else if (document.msCancelFullScreen) {
            document.msCancelFullScreen();
        }
    };

    // External files
    BABYLON.Tools.BaseUrl = "";

    BABYLON.Tools.LoadImage = function (url, onload, onerror, database) {  
        var img = new Image();

        img.onload = function () {
            onload(img);
        };

        img.onerror = function (err) {
            onerror(img, err);
        };

        var noIndexedDB = function () {
            img.src = url;
        };

        var loadFromIndexedDB = function () {
            database.loadImageFromDB(url, img);
        };

        if (database && database.enableTexturesOffline && BABYLON.Database.isUASupportingBlobStorage) {
            database.openAsync(loadFromIndexedDB, noIndexedDB);
        }
        else {
            if (url.indexOf("file:") === -1) {
                noIndexedDB();
            }
            else {
                try {
                    var textureName = url.substring(5);
                    img.src = URL.createObjectURL(BABYLON.FilesTextures[textureName]);
                }
                catch (e) {
                    console.log("Error while trying to load texture: " + textureName);
                    img.src = null;
                }
            }
        }

        return img;
    };

    BABYLON.Tools.LoadFile = function (url, callback, progressCallBack, database) {
        var noIndexedDB = function () {
            var request = new XMLHttpRequest();
            var loadUrl = BABYLON.Tools.BaseUrl + url;
            request.open('GET', loadUrl, true);

            request.onprogress = progressCallBack;

            request.onreadystatechange = function () {
                if (request.readyState == 4) {
                    if (request.status == 200) {
                        callback(request.responseText);
                    } else { // Failed
                        throw new Error(request.status, "Unable to load " + loadUrl);
                    }
                }
            };

            request.send(null);
        };

        var loadFromIndexedDB = function () {
            database.loadSceneFromDB(url, callback, progressCallBack, noIndexedDB);
        };

        // Caching only scenes files
        if (database && url.indexOf(".babylon") !== -1 && (database.enableSceneOffline)) {
            database.openAsync(loadFromIndexedDB, noIndexedDB);
        }
        else {
            noIndexedDB();
        }
    };

    BABYLON.Tools.ReadFile = function (fileToLoad, callback, progressCallBack) {
        var reader = new FileReader();
        reader.onload = function (e) {
            callback(e.target.result);
        };
        reader.onprogress = progressCallBack;
        // Asynchronous read
        reader.readAsText(fileToLoad);
    };

    // Misc.    
    BABYLON.Tools.isIE = function () {
        return window.ActiveXObject !== undefined;
    };
    
    BABYLON.Tools.WithinEpsilon = function (a, b) {
        var num = a - b;
        return -1.401298E-45 <= num && num <= 1.401298E-45;
    };

    var cloneValue = function (source, destinationObject) {
        if (!source)
            return null;

        if (source instanceof BABYLON.Mesh) {
            return null;
        }

        if (source instanceof BABYLON.SubMesh) {
            return source.clone(destinationObject);
        } else if (source.clone) {
            return source.clone();
        }
        return null;
    };

    BABYLON.Tools.DeepCopy = function (source, destination, doNotCopyList, mustCopyList) {
        for (var prop in source) {

            if (prop[0] === "_" && (!mustCopyList || mustCopyList.indexOf(prop) === -1)) {
                continue;
            }

            if (doNotCopyList && doNotCopyList.indexOf(prop) !== -1) {
                continue;
            }
            var sourceValue = source[prop];
            var typeOfSourceValue = typeof sourceValue;

            if (typeOfSourceValue == "function") {
                continue;
            }

            if (typeOfSourceValue == "object") {
                if (sourceValue instanceof Array) {
                    destination[prop] = [];

                    if (sourceValue.length > 0) {
                        if (typeof sourceValue[0] == "object") {
                            for (var index = 0; index < sourceValue.length; index++) {
                                var clonedValue = cloneValue(sourceValue[index], destination);

                                if (destination[prop].indexOf(clonedValue) === -1) { // Test if auto inject was not done
                                    destination[prop].push(clonedValue);
                                }
                            }
                        } else {
                            destination[prop] = sourceValue.slice(0);
                        }
                    }
                } else {
                    destination[prop] = cloneValue(sourceValue, destination);
                }
            } else {
                destination[prop] = sourceValue;
            }
        }
    };

    // FPS
    var fpsRange = 60;
    var previousFramesDuration = [];
    var fps = 60;
    var deltaTime = 0;

    BABYLON.Tools.GetFps = function () {
        return fps;
    };

    BABYLON.Tools.GetDeltaTime = function () {
        return deltaTime;
    };

    BABYLON.Tools._MeasureFps = function () {
        previousFramesDuration.push((new Date).getTime());
        var length = previousFramesDuration.length;

        if (length >= 2) {
            deltaTime = previousFramesDuration[length - 1] - previousFramesDuration[length - 2];
        }

        if (length >= fpsRange) {

            if (length > fpsRange) {
                previousFramesDuration.splice(0, 1);
                length = previousFramesDuration.length;
            }

            var sum = 0;
            for (var id = 0; id < length - 1; id++) {
                sum += previousFramesDuration[id + 1] - previousFramesDuration[id];
            }

            fps = 1000.0 / (sum / (length - 1));
        }
    };

})();