/**
 * @class Ext.ux.Spinner
 * @extends Ext.util.Observable
 * Creates a Spinner control utilized by Ext.ux.form.SpinnerField
 */
Ext.ux.Spinner = Ext.extend(Ext.util.Observable, {
    incrementValue: 1,
    alternateIncrementValue: 5,
    triggerClass: 'x-form-spinner-trigger',
    splitterClass: 'x-form-spinner-splitter',
    alternateKey: Ext.EventObject.shiftKey,
    defaultValue: 0,
    accelerate: false,

    constructor: function(config){
        Ext.ux.Spinner.superclass.constructor.call(this, config);
        Ext.apply(this, config);
        this.mimicing = false;
    },

    init: function(field){
        this.field = field;

        field.afterMethod('onRender', this.doRender, this);
        field.afterMethod('onEnable', this.doEnable, this);
        field.afterMethod('onDisable', this.doDisable, this);
        field.afterMethod('afterRender', this.doAfterRender, this);
        field.afterMethod('onResize', this.doResize, this);
        field.afterMethod('onFocus', this.doFocus, this);
        field.beforeMethod('onDestroy', this.doDestroy, this);
    },

    doRender: function(ct, position){
        var el = this.el = this.field.getEl();
        var f = this.field;

        if (!f.wrap) {
            f.wrap = this.wrap = el.wrap({
                cls: "x-form-field-wrap"
            });
        }
        else {
            this.wrap = f.wrap.addClass('x-form-field-wrap');
        }

        this.trigger = this.wrap.createChild({
            tag: "img",
            src: Ext.BLANK_IMAGE_URL,
            cls: "x-form-trigger " + this.triggerClass
        });

        if (!f.width) {
            this.wrap.setWidth(el.getWidth() + this.trigger.getWidth());
        }

        this.splitter = this.wrap.createChild({
            tag: 'div',
            cls: this.splitterClass,
            style: 'width:13px; height:2px;'
        });
        this.splitter.setRight((Ext.isIE) ? 1 : 2).setTop(10).show();

        this.proxy = this.trigger.createProxy('', this.splitter, true);
        this.proxy.addClass("x-form-spinner-proxy");
        this.proxy.setStyle('left', '0px');
        this.proxy.setSize(14, 1);
        this.proxy.hide();
        this.dd = new Ext.dd.DDProxy(this.splitter.dom.id, "SpinnerDrag", {
            dragElId: this.proxy.id
        });

        this.initTrigger();
        this.initSpinner();
    },

    doAfterRender: function(){
        var y;
        if (Ext.isIE && this.el.getY() != (y = this.trigger.getY())) {
            this.el.position();
            this.el.setY(y);
        }
    },

    doEnable: function(){
        if (this.wrap) {
            this.wrap.removeClass(this.field.disabledClass);
        }
    },

    doDisable: function(){
        if (this.wrap) {
            this.wrap.addClass(this.field.disabledClass);
            this.el.removeClass(this.field.disabledClass);
        }
    },

    doResize: function(w, h){
        if (typeof w == 'number') {
            this.el.setWidth(w - this.trigger.getWidth());
        }
        this.wrap.setWidth(this.el.getWidth() + this.trigger.getWidth());
    },

    doFocus: function(){
        if (!this.mimicing) {
            this.wrap.addClass('x-trigger-wrap-focus');
            this.mimicing = true;
            Ext.get(Ext.isIE ? document.body : document).on("mousedown", this.mimicBlur, this, {
                delay: 10
            });
            this.el.on('keydown', this.checkTab, this);
        }
    },

    // private
    checkTab: function(e){
        if (e.getKey() == e.TAB) {
            this.triggerBlur();
        }
    },

    // private
    mimicBlur: function(e){
        if (!this.wrap.contains(e.target) && this.field.validateBlur(e)) {
            this.triggerBlur();
        }
    },

    // private
    triggerBlur: function(){
        this.mimicing = false;
        Ext.get(Ext.isIE ? document.body : document).un("mousedown", this.mimicBlur, this);
        this.el.un("keydown", this.checkTab, this);
        this.field.beforeBlur();
        this.wrap.removeClass('x-trigger-wrap-focus');
        this.field.onBlur.call(this.field);
    },

    initTrigger: function(){
        this.trigger.addClassOnOver('x-form-trigger-over');
        this.trigger.addClassOnClick('x-form-trigger-click');
    },

    initSpinner: function(){
        this.field.addEvents({
            'spin': true,
            'spinup': true,
            'spindown': true
        });

        this.keyNav = new Ext.KeyNav(this.el, {
            "up": function(e){
                e.preventDefault();
                this.onSpinUp();
            },

            "down": function(e){
                e.preventDefault();
                this.onSpinDown();
            },

            "pageUp": function(e){
                e.preventDefault();
                this.onSpinUpAlternate();
            },

            "pageDown": function(e){
                e.preventDefault();
                this.onSpinDownAlternate();
            },

            scope: this
        });

        this.repeater = new Ext.util.ClickRepeater(this.trigger, {
            accelerate: this.accelerate
        });
        this.field.mon(this.repeater, "click", this.onTriggerClick, this, {
            preventDefault: true
        });

        this.field.mon(this.trigger, {
            mouseover: this.onMouseOver,
            mouseout: this.onMouseOut,
            mousemove: this.onMouseMove,
            mousedown: this.onMouseDown,
            mouseup: this.onMouseUp,
            scope: this,
            preventDefault: true
        });

        this.field.mon(this.wrap, "mousewheel", this.handleMouseWheel, this);

        this.dd.setXConstraint(0, 0, 10)
        this.dd.setYConstraint(1500, 1500, 10);
        this.dd.endDrag = this.endDrag.createDelegate(this);
        this.dd.startDrag = this.startDrag.createDelegate(this);
        this.dd.onDrag = this.onDrag.createDelegate(this);
    },

    onMouseOver: function(){
        if (this.disabled) {
            return;
        }
        var middle = this.getMiddle();
        this.tmpHoverClass = (Ext.EventObject.getPageY() < middle) ? 'x-form-spinner-overup' : 'x-form-spinner-overdown';
        this.trigger.addClass(this.tmpHoverClass);
    },

    //private
    onMouseOut: function(){
        this.trigger.removeClass(this.tmpHoverClass);
    },

    //private
    onMouseMove: function(){
        if (this.disabled) {
            return;
        }
        var middle = this.getMiddle();
        if (((Ext.EventObject.getPageY() > middle) && this.tmpHoverClass == "x-form-spinner-overup") ||
        ((Ext.EventObject.getPageY() < middle) && this.tmpHoverClass == "x-form-spinner-overdown")) {
        }
    },

    //private
    onMouseDown: function(){
        if (this.disabled) {
            return;
        }
        var middle = this.getMiddle();
        this.tmpClickClass = (Ext.EventObject.getPageY() < middle) ? 'x-form-spinner-clickup' : 'x-form-spinner-clickdown';
        this.trigger.addClass(this.tmpClickClass);
    },

    //private
    onMouseUp: function(){
        this.trigger.removeClass(this.tmpClickClass);
    },

    //private
    onTriggerClick: function(){
        if (this.disabled || this.el.dom.readOnly) {
            return;
        }
        var middle = this.getMiddle();
        var ud = (Ext.EventObject.getPageY() < middle) ? 'Up' : 'Down';
        this['onSpin' + ud]();
    },

    //private
    getMiddle: function(){
        var t = this.trigger.getTop();
        var h = this.trigger.getHeight();
        var middle = t + (h / 2);
        return middle;
    },

    //private
    //checks if control is allowed to spin
    isSpinnable: function(){
        if (this.disabled || this.el.dom.readOnly) {
            Ext.EventObject.preventDefault(); //prevent scrolling when disabled/readonly
            return false;
        }
        return true;
    },

    handleMouseWheel: function(e){
        //disable scrolling when not focused
        if (this.wrap.hasClass('x-trigger-wrap-focus') == false) {
            return;
        }

        var delta = e.getWheelDelta();
        if (delta > 0) {
            this.onSpinUp();
            e.stopEvent();
        }
        else
            if (delta < 0) {
                this.onSpinDown();
                e.stopEvent();
            }
    },

    //private
    startDrag: function(){
        this.proxy.show();
        this._previousY = Ext.fly(this.dd.getDragEl()).getTop();
    },

    //private
    endDrag: function(){
        this.proxy.hide();
    },

    //private
    onDrag: function(){
        if (this.disabled) {
            return;
        }
        var y = Ext.fly(this.dd.getDragEl()).getTop();
        var ud = '';

        if (this._previousY > y) {
            ud = 'Up';
        } //up
        if (this._previousY < y) {
            ud = 'Down';
        } //down
        if (ud != '') {
            this['onSpin' + ud]();
        }

        this._previousY = y;
    },

    //private
    onSpinUp: function(){
        if (this.isSpinnable() == false) {
            return;
        }
        if (Ext.EventObject.shiftKey == true) {
            this.onSpinUpAlternate();
            return;
        }
        else {
            this.spin(false, false);
        }
        this.field.fireEvent("spin", this);
        this.field.fireEvent("spinup", this);
    },

    //private
    onSpinDown: function(){
        if (this.isSpinnable() == false) {
            return;
        }
        if (Ext.EventObject.shiftKey == true) {
            this.onSpinDownAlternate();
            return;
        }
        else {
            this.spin(true, false);
        }
        this.field.fireEvent("spin", this);
        this.field.fireEvent("spindown", this);
    },

    //private
    onSpinUpAlternate: function(){
        if (this.isSpinnable() == false) {
            return;
        }
        this.spin(false, true);
        this.field.fireEvent("spin", this);
        this.field.fireEvent("spinup", this);
    },

    //private
    onSpinDownAlternate: function(){
        if (this.isSpinnable() == false) {
            return;
        }
        this.spin(true, true);
        this.field.fireEvent("spin", this);
        this.field.fireEvent("spindown", this);
    },

    spin: function(down, alternate){
        var v = parseFloat(this.field.getValue());
        var incr = (alternate == true) ? this.alternateIncrementValue : this.incrementValue;
        (down == true) ? v -= incr : v += incr;

        v = (isNaN(v)) ? this.defaultValue : v;
        v = this.fixBoundries(v);
        this.field.setRawValue(v);
    },

    fixBoundries: function(value){
        var v = value;

        if (this.field.minValue != undefined && v < this.field.minValue) {
            v = this.field.minValue;
        }
        if (this.field.maxValue != undefined && v > this.field.maxValue) {
            v = this.field.maxValue;
        }

        return this.fixPrecision(v);
    },

    // private
    fixPrecision: function(value){
        var nan = isNaN(value);
        if (!this.field.allowDecimals || this.field.decimalPrecision == -1 || nan || !value) {
            return nan ? '' : value;
        }
        return parseFloat(parseFloat(value).toFixed(this.field.decimalPrecision));
    },

    doDestroy: function(){
        if (this.trigger) {
            this.trigger.remove();
        }
        if (this.wrap) {
            this.wrap.remove();
            delete this.field.wrap;
        }

        if (this.splitter) {
            this.splitter.remove();
        }

        if (this.dd) {
            this.dd.unreg();
            this.dd = null;
        }

        if (this.proxy) {
            this.proxy.remove();
        }

        if (this.repeater) {
            this.repeater.purgeListeners();
        }
    }
});

//backwards compat
Ext.form.Spinner = Ext.ux.Spinner;