/**
 * A data field that automatically {@link #convert converts} its value to a date.
 *
 *     @example
 *     Ext.define('User', {
 *         extend: 'Ext.data.Model',
 *         fields: [
 *             { name: 'birthDate', type: 'date' }
 *         ]
 *     });
 *
 *     var record = Ext.create('User', { birthDate: 'Tuesday, June 27, 2017' }),
 *         value = record.get('birthDate');
 *
 *     Ext.toast("birthDate is " + value);
 */
Ext.define('Ext.data.field.Date', {
    extend: 'Ext.data.field.Field',

    alias: 'data.field.date',

    sortType: 'asDate',

    isDateField: true,

    /**
     * @cfg {String} dateFormat
     *
     * Serves as a default for the {@link #dateReadFormat} and {@link #dateWriteFormat} config
     * options. This will be used in place of those other configurations if not specified.
     * 
     * A format string for the {@link Ext.Date#parse Ext.Date.parse} function, or "timestamp"
     * if the value provided by the Reader is a UNIX timestamp, or "time" if the value provided by
     * the Reader is a javascript millisecond timestamp. See {@link Ext.Date}.
     * 
     * It is quite important to note that while this config is optional, it will default to using
     * the base JavaScript Date object's `parse` function if not specified, rather than
     * {@link Ext.Date#parse Ext.Date.parse}. This can cause unexpected issues, especially when
     * converting between timezones, or when converting dates that do not have a timezone specified.
     * The behavior of the native `Date.parse` is implementation-specific, and depending on the
     * value of the date string, it might return the UTC date or the local date. __For this reason
     * it is strongly recommended that you always specify an explicit date format when parsing
     * dates.__
     */
    dateFormat: null,

    /**
     * @cfg {String} dateReadFormat
     * Used when converting received data into a Date when the {@link #type} is specified as
     * `"date"`. This configuration takes precedence over {@link #dateFormat}.
     * See {@link #dateFormat} for more information.
     */
    dateReadFormat: null,

    /** 
     * @cfg {String} dateWriteFormat
     * Provides a custom format when serializing dates with a {@link Ext.data.writer.Writer}.
     * If this is not specified, the {@link #dateFormat} will be used. If no `dateFormat`
     * is specified, 'timestamp' format is used.
     *
     * See the {@link Ext.data.writer.Writer} docs for more information on writing dates.
     *
     * **Note** It is not possible to use the standard date serialization pathway or
     * {@link Ext#USE_NATIVE_JSON native browser JSON production} to use a
     * {@link Ext.data.JsonWriter JsonWriter} to send Microsoft formated "JSON" dates.
     *
     * To use a {@link Ext.data.JsonWriter JsonWriter} to write dates in a JSON packet in
     * the form `"\/Date(1357372800000)\/"` configure the field like this:
     *
     *     {
     *         type: 'date',
     *         dateFormat: 'MS',     // To parse incoming dates from server correctly
     *         serialize: null       // Avoid formatting or conversion by the Writer
     *     }
     *
     * Then override the `Ext.JSON` date serialize function:
     *
     *     Ext.JSON.encodeDate = function (d) {
     *         return '"' + Ext.Date.format(d, 'MS') + '"';
     *     };
     */
    dateWriteFormat: null,

    /**
     * @cfg {Boolean} useStrict
     * @since 6.2.0
     * Used to manually set strict date parsing on a per-field basis. If no `useStrict`
     * is specified, will use value of {@link Ext.Date#useStrict} to determine how to
     * process dates.
     */

    compare: function(lhs, rhs) {
        var lhsIsDate = lhs instanceof Date,
            rhsIsDate = rhs instanceof Date,
            result;

        if (rhsIsDate && lhsIsDate) {
            result = lhs.getTime() - rhs.getTime();

            if (result === 0) {
                result = 0;
            }
            else {
                result = result < 0 ? -1 : 1;
            }
        }
        else if (lhsIsDate === rhsIsDate) {
            result = 0;
        }
        else {
            result = lhsIsDate ? 1 : -1;
        }

        return result;
    },

    convert: function(v) {
        if (!v) {
            return null;
        }

        // instanceof check ~10 times faster than Ext.isDate. Values here will not be
        // cross-document objects
        if (v instanceof Date) {
            return v;
        }

        /* eslint-disable-next-line vars-on-top */
        var dateFormat = this.dateReadFormat || this.dateFormat,
            parsed;

        if (dateFormat) {
            return Ext.Date.parse(v, dateFormat, this.useStrict);
        }

        parsed = Date.parse(v);

        return parsed ? new Date(parsed) : null;
    },

    serialize: function(value) {
        var result = null,
            format;

        if (Ext.isDate(value)) {
            format = this.getDateWriteFormat();
            result = format ? Ext.Date.format(value, format) : value;
        }

        return result;
    },

    /**
     * Gets the dateFormat for this field. See {@link #dateFormat}.
     * @return {String} dateFormat
     */
    getDateFormat: function() {
        return this.dateFormat;
    },

    /**
     * Gets the dateReadFormat for this field. See {@link #dateReadFormat}.
     * @return {String} dateReadFormat
     */
    getDateReadFormat: function() {
        return this.dateReadFormat;
    },

    /**
     * Gets the dateWriteFormat for this field. See {@link #dateWriteFormat}.
     * @return {String} dateWriteFormat
     */
    getDateWriteFormat: function() {
        var me = this;

        if (me.hasOwnProperty('dateWriteFormat')) {
            return me.dateWriteFormat;
        }

        if (me.hasOwnProperty('dateFormat')) {
            return me.dateFormat;
        }

        return me.dateWriteFormat || me.dateFormat || 'timestamp';
    },

    getType: function() {
        return 'date';
    }
});