/* <copyright>
Copyright (c) 2012, Motorola Mobility LLC.
All Rights Reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

* Neither the name of Motorola Mobility LLC nor the names of its
  contributors may be used to endorse or promote products derived from this
  software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
</copyright> */

// Slider, HotText and HotTextUnit will extend this class.
var Montage = require("montage/core/core").Montage;
var Component = require("montage/ui/component").Component;

var SliderBase = exports.SliderBase = Montage.create(Component, {

    _hasFocus: {
        enumerable: false,
        value: false
    },

    _touchIdentifier: {
        enumerable: false,
        value: null
    },

    _xStart: {
        enumerable: false,
        value: 0
    },

    _yStart: {
        enumerable: false,
        value: 0
    },

    _previousValue: {
        enumerable: false,
        value: null
    },

    _isMouseDown: {
        enumerable: true,
        value: false
    },

    // We need to calculate some metrics on the first draw after prepareForDraw because
    // styles values are not available during prepareForDraw
    _firstTime: {
        enumerable: false,
        value: true
    },

    _enabled: {
        enumerable: true,
        value: true
    },

    enabled: {
        enumerable: true,
        get: function() {
            return this._enabled;
        },
        set: function(value) {

            if (value !== this._enabled) {
                this._enabled = value;
                if(this._enabled)
                {
                    this.element.classList.remove("disabled");

                    this.element.addEventListener("blur", this);
                    this.element.addEventListener("focus", this);

                    this.element.addEventListener("touchstart", this, false);
                    this.element.addEventListener("mousedown", this, false);
                }
                else
                {
                    this.element.classList.add("disabled");

                    this.element.removeEventListener("blur", this);
                    this.element.removeEventListener("focus", this);

                    this.element.removeEventListener("touchstart", this, false);
                    this.element.removeEventListener("mousedown", this, false);
                }
                this.needsDraw = true;
            }
        },
        serializable: true
    },

    // Internal flags to determine what the change/changing events will contain
    _eventType: {
        enumerable: false,
        value: "change"
    },

    _wasSetByCode: {
        enumerable: false,
        value: true
    },

    _setEventFlags: {
        value: function (eventType, wasSetByCode) {
            this._eventType = eventType;
            this._wasSetByCode = wasSetByCode;
        }
    },

    _value: {
        enumerable: false,
        value: 0
    },

    value: {
        enumerable: true,
        get: function() {
            return this._value;
        },
        set: function(value) {
            if (isNaN(value)) {
                return;
            }

            if (value < this._minValue) {
                value = this._minValue;
            }
            else if (value > this._maxValue) {
                value = this._maxValue;
            }

            if (value !== this._value) {
                this._value = value;
                this.needsDraw = true;
                this._dispatchActionEvent();
            }
        }
    },

    _minValue: {
        enumerable: false,
        value: 0
    },

    minValue: {
        get: function() {
            return this._minValue;
        },
        set: function(value) {
            if (value !== this._minValue) {
                this._minValue = value;
                this._firstTime = true;     // Force layout recalculation.
                if (this._value < value)
                {
                    this.value = value;
                }
                this.needsDraw = true;
            }
        },
        serializable: true
    },

    _maxValue: {
        enumerable: false,
        value: 100
    },

    maxValue: {
        get: function() {
            return this._maxValue;
        },
        set: function(value) {
            if (value !== this._maxValue) {
                this._maxValue = value;
                this._firstTime = true;     // Force layout recalculation.
                if (this._value > value)
                {
                    this.value = value;
                }
                this.needsDraw = true;
            }
        },
        serializable: true
    },

    _valueCoef: {
        value: 1
    },

    _valueFromPageOffset: {
        value: function(offset, pageY, isShiftKeyPressed) {
            // Implement in subclass.
        }
    },

    handleMousedown: {
        value: function (event) {
//            event.preventDefault();   // Commenting out -- other elements need to blur when we are moused down
            var clickPoint = webkitConvertPointFromPageToNode(this.element, new WebKitPoint(event.pageX, event.pageY));
            this._xStart = clickPoint.x;
            this._yStart = clickPoint.y;
            this._previousValue = this.value;
            this._isMouseDown = true;
            document.addEventListener("mousemove", this, false);
            document.addEventListener("mouseup", this, false);
         }
    },

    handleTouchstart: {
        value: function (event) {
            event.preventDefault(); // Not sure how to let other elements blur if we need to override mobile behavior
            var touch = event.targetTouches[0];
            this._touchIdentifier = touch.identifier;
            var clickPoint = webkitConvertPointFromPageToNode(this.element, new WebKitPoint(touch.pageX,touch.pageY));
            this._xStart = clickPoint.x;
            this._yStart = clickPoint.y;
            this._previousValue = this.value;
            this._isMouseDown = true;
            document.addEventListener("touchmove", this, false);
            document.addEventListener("touchend", this, false);
         }
    },

    handleMousemove: {
        value: function (event) {
            event.target.style.cursor = "pointer";
            this._setEventFlags("changing", false);
            this._valueFromPageOffset(event.pageX, event.pageY, event.shiftKey);
        }
    },

    handleTouchmove: {
        value: function (event) {
            for(var i=0, iTouch; iTouch = event.changedTouches[i]; i++) {
                if (iTouch.identifier === this._touchIdentifier) {
                    this._setEventFlags("changing", false);
                    this._valueFromPageOffset(iTouch.pageX, iTouch.pageY, false);
                    break;
                }
            }
        }
    },

    handleMouseup: {
        value: function (event) {
            document.removeEventListener("mousemove", this);
            document.removeEventListener("mouseup", this);
            this._isMouseDown = false;
            event.target.style.cursor = "default";
            this._setEventFlags("change", false);
            this._valueFromPageOffset(event.pageX, event.pageY, event.shiftKey);
            this._previousValue = null;
        }
    },

    handleTouchend: {
        enumerable: false,
        value: function (event) {
            for(var i=0, iTouch; iTouch = event.changedTouches[i]; i++) {
                if (iTouch.identifier === this._touchIdentifier) {
                    this._touchIdentifier = null;
                    this._isMouseDown = false;
                    document.removeEventListener("touchmove", this);
                    document.removeEventListener("touchend", this);
                    this._setEventFlags("change", false);
                    this._valueFromPageOffset(iTouch.pageX, iTouch.pageY, false);
                    this._previousValue = null;
                    break;
                }
            }
        }
    },

    _dispatchActionEvent: {
        value: function() {
            var actionEvent = document.createEvent("CustomEvent");
            actionEvent.initEvent(this._eventType, true, true);
            actionEvent.type = this._eventType;
            actionEvent.wasSetByCode = this._wasSetByCode;
            // reset event flags
            this._setEventFlags("change", true);
            this.dispatchEvent(actionEvent);
        }
    }

});