/* <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> */

var Montage = require("montage/core/core").Montage;
var HotText = require("js/components/hottext.reel").HotText;

var HotTextUnit = exports.HotTextUnit = Montage.create(HotText, {

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

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

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

    _units: {
        enumerable: false,
        value: "px"
    },

    units: {
        serializable: true,
        enumerable: true,
        get: function() {
            return this._units;
        },
        set: function(value) {
            if (value !== this._units) {
                if(this._acceptableUnits.indexOf(value) !== -1)
                {
                    this._units = value;
                    this._unitsModified = true;
                    this.needsDraw = true;

                    this._setEventFlags("change", true);
                    this._dispatchActionEvent();
                }
            } else {
                this._unitsModified = false;
            }
        }
    },

    // Some controls will only support certain units
    // For example, Oval would specify an innerRadius with acceptableUnits = ["%"]
    // and Stroke Size with acceptableUnits = ["px", "pt", "%"]
    _acceptableUnits: {
        enumerable: false,
        value: ["px"]
    },


    acceptableUnits: {
        serializable: true,
        enumerable: true,
        get: function() {
            return this._acceptableUnits;
        },
        set: function(value) {
            if (value !== this._acceptableUnits) {
                this._acceptableUnits = value;
            }
        }
    },

    // We don't want to handle every input; we only want to handle input from tab or enter
    // Thus, we don't listen for an input event; we call this from handleKeydown
    handleInput: {
        enumerable: false,
        value: function() {
            var inputString = this.inputField.value;

            // Ignore all whitespace, digits, negative sign and "." when looking for units label
            // The units must come after one or more digits
            var objRegExp = /(\-*\d+\.*\d*)(\s*)(\w*\%*)/;
            var unitsString = inputString.replace(objRegExp, "$3");
            if(unitsString)
            {
                var noSpaces = /(\s*)(\S*)(\s*)/;
                // strip out spaces and convert to lower case
                var match = (unitsString.replace(noSpaces, "$2")).toLowerCase();
                if(match)
                {
                    this.units = match;
                }
            }

            this._setEventFlags("change", false);
            // Moving this call to after setting the value since value changes are dispatching events before units are set
            this.value = this.inputFunction(inputString);
        }
    },

    draw: {
        enumerable: false,
        value: function() {
            this.inputField.value = this._value + " " + this._units;
            this.numericField.innerText = this._value;
            this.unitsField.innerText = " " + this._units;


            if(this._hasFocus)
            {
                this.numericField.classList.add("hide");
                this.unitsField.classList.add("hide");

                this.inputField.classList.remove("hide");

                // if element targeted; balancing demands of multitouch
                // with traditional single focus model
                this.inputField.addEventListener("keydown", this, false);
            }
            else
            {
                this.numericField.classList.remove("hide");
                this.unitsField.classList.remove("hide");

                this.inputField.classList.add("hide");
            }
        }
    },

    didDraw: {
        enumerable: false,
        value: function() {
            if(this._hasFocus)
            {
                var length = 0;
                if(this.labelFunction)
                {
                    length = this.labelFunction(this._value).length;
                }
                else
                {
                    length = this.inputField.value.toString().length;
                }
                this.inputField.setSelectionRange(0, length);
            }
            this._valueSyncedWithInputField = true;
        }
    },

    prepareForDraw: {
        value: function() {
            this.numericField = document.createElement("span");
            this.numericField.classList.add("underline");
            this.numericField.innerText = this._value;

            this.unitsField = document.createElement("span");
            this.unitsField.innerText = " " + this._units;

            this.inputField = document.createElement("input");
            this.inputField.value = this._value + " " + this._units;
            this.inputField.classList.add("hide");

            this.element.appendChild(this.numericField);
            this.element.appendChild(this.unitsField);
            this.element.appendChild(this.inputField);


            if(this._value)
            {
                this._numValue = this._value;
            }

            if(this._enabled)
            {
                this.element.addEventListener("blur", this);
                this.element.addEventListener("focus", this);

                this.element.addEventListener("touchstart", this, false);
                this.element.addEventListener("mousedown", this, false);
            }
        }
    }

});