/**
 * A time picker which provides a list of times from which to choose. This is used by the Ext.form.field.Time
 * class to allow browsing and selection of valid times, but could also be used with other components.
 *
 * By default, all times starting at midnight and incrementing every 15 minutes will be presented. This list of
 * available times can be controlled using the {@link #minValue}, {@link #maxValue}, and {@link #increment}
 * configuration properties. The format of the times presented in the list can be customized with the {@link #format}
 * config.
 *
 * To handle when the user selects a time from the list, you can subscribe to the {@link #selectionchange} event.
 *
 *     @example
 *     Ext.create('Ext.picker.Time', {
 *        width: 60,
 *        minValue: Ext.Date.parse('04:30:00 AM', 'h:i:s A'),
 *        maxValue: Ext.Date.parse('08:00:00 AM', 'h:i:s A'),
 *        renderTo: Ext.getBody()
 *     });
 */
Ext.define('Ext.picker.Time', {
    extend: 'Ext.view.BoundList',
    alias: 'widget.timepicker',
    requires: ['Ext.data.Store', 'Ext.Date'],

    /**
     * @cfg {Date} minValue
     * The minimum time to be shown in the list of times. This must be a Date object (only the time fields will be
     * used); no parsing of String values will be done.
     */

    /**
     * @cfg {Date} maxValue
     * The maximum time to be shown in the list of times. This must be a Date object (only the time fields will be
     * used); no parsing of String values will be done.
     */

    /**
     * @cfg {Number} increment
     * The number of minutes between each time value in the list.
     */
    increment: 15,

    //<locale>
    /**
     * @cfg {String} [format=undefined]
     * The default time format string which can be overriden for localization support. The format must be valid
     * according to {@link Ext.Date#parse}.
     *
     * Defaults to `'g:i A'`, e.g., `'3:15 PM'`. For 24-hour time format try `'H:i'` instead.
     */
    format : "g:i A",
    //</locale>

    /**
     * @private
     * The field in the implicitly-generated Model objects that gets displayed in the list. This is
     * an internal field name only and is not useful to change via config.
     */
    displayField: 'disp',

    /**
     * @private
     * Year, month, and day that all times will be normalized into internally.
     */
    initDate: [2008,0,1],

    componentCls: Ext.baseCSSPrefix + 'timepicker',

    /**
     * @cfg
     * @private
     */
    loadMask: false,

    initComponent: function() {
        var me = this,
            dateUtil = Ext.Date,
            clearTime = dateUtil.clearTime,
            initDate = me.initDate;

        // Set up absolute min and max for the entire day
        me.absMin = clearTime(new Date(initDate[0], initDate[1], initDate[2]));
        me.absMax = dateUtil.add(clearTime(new Date(initDate[0], initDate[1], initDate[2])), 'mi', (24 * 60) - 1);

        me.store = me.createStore();
        me.updateList();

        me.callParent();
    },

    /**
     * Set the {@link #minValue} and update the list of available times. This must be a Date object (only the time
     * fields will be used); no parsing of String values will be done.
     * @param {Date} value
     */
    setMinValue: function(value) {
        this.minValue = value;
        this.updateList();
    },

    /**
     * Set the {@link #maxValue} and update the list of available times. This must be a Date object (only the time
     * fields will be used); no parsing of String values will be done.
     * @param {Date} value
     */
    setMaxValue: function(value) {
        this.maxValue = value;
        this.updateList();
    },

    /**
     * @private
     * Sets the year/month/day of the given Date object to the {@link #initDate}, so that only
     * the time fields are significant. This makes values suitable for time comparison.
     * @param {Date} date
     */
    normalizeDate: function(date) {
        var initDate = this.initDate;
        date.setFullYear(initDate[0], initDate[1], initDate[2]);
        return date;
    },

    /**
     * Update the list of available times in the list to be constrained within the {@link #minValue}
     * and {@link #maxValue}.
     */
    updateList: function() {
        var me = this,
            min = me.normalizeDate(me.minValue || me.absMin),
            max = me.normalizeDate(me.maxValue || me.absMax);

        me.store.filterBy(function(record) {
            var date = record.get('date');
            return date >= min && date <= max;
        });
    },

    /**
     * @private
     * Creates the internal {@link Ext.data.Store} that contains the available times. The store
     * is loaded with all possible times, and it is later filtered to hide those times outside
     * the minValue/maxValue.
     */
    createStore: function() {
        var me = this,
            utilDate = Ext.Date,
            times = [],
            min = me.absMin,
            max = me.absMax;

        while(min <= max){
            times.push({
                disp: utilDate.dateFormat(min, me.format),
                date: min
            });
            min = utilDate.add(min, 'mi', me.increment);
        }

        return new Ext.data.Store({
            fields: ['disp', 'date'],
            data: times
        });
    }

});
