/**
 * Contains CalcClientDebugTab class
 *
 *  Copyright (C) 2017 R-T Specialty, LLC.
 *
 *  This file is part of the Liza Data Collection Framework
 *
 *  Liza is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

var Class          = require( 'easejs' ).Class,
    ClientDebugTab = require( './ClientDebugTab' ),
    calc           = require( '../../calc/Calc' );


/**
 * Monitors client-side assertions
 */
module.exports = Class( 'CalcClientDebugTab' )
    .implement( ClientDebugTab )
    .extend(
{
    'private _$content': null,


    /**
     * Retrieve tab title
     *
     * @return {string} tab title
     */
    'public getTitle': function()
    {
        return 'Calculated Values';
    },


    /**
     * Retrieve tab content
     *
     * @param {Client}        client active client being debugged
     * @param {StagingBucket} bucket bucket to reference for data
     *
     * @return {jQuery|string} tab content
     */
    'public getContent': function( client, bucket )
    {
        this._$content = $( '<div>' )
            .append( $( '<p>' ).text(
                "Quick-n-dirty calculated value test tool. Select the " +
                "method to test below, followed by the data and value " +
                "arguments. See the Calc module for more information."
            ) );

        this._addRow();
        this._addButtons();

        return this._$content;
    },


    /**
     * Add calculated value row which will perform the requested calculation
     * with the provided parameter values
     *
     * @return {undefined}
     */
    'private _addRow': function()
    {
        var _self   = this,
            $sel    = null,
            $data   = null,
            $value  = null,
            $result = null,

            changeCallback = function()
            {
                _self._doCalc( $sel.val(), $data.val(), $value.val(), $result );
            }
        ;

        this._$content.append( $( '<div>' )
            .addClass( 'row' )
            .append( $sel = $( '<select>' )
                .change( changeCallback )
            )
            .append( $data = $( '<input type="text">' )
                .val( '[]' )
                .change( changeCallback )
            )
            .append( $value = $( '<input type="text">' )
                .val( '[]' )
                .change( changeCallback )
            )
            .append( $result = $( '<span>' ) )
        );

        for ( method in calc )
        {
            $sel.append( $( '<option>' )
                .val( method )
                .text( method )
            );
        }

        changeCallback();
    },


    /**
     * Perform calculation and update given result element
     *
     * @param {string} sel     selected method
     * @param {string} data    given data argument
     * @param {string} value   given value argument
     * @param {jQuery} $result result element to update
     *
     * @return {undefined}
     */
    'private _doCalc': function( sel, data, value, $result )
    {
        var result = null;

        // don't do anything if no method was selected
        if ( !sel)
        {
            return;
        }

        try
        {
            result = calc[ sel ](
                JSON.parse( data || [] ),
                JSON.parse( value || [] )
            );
        }
        catch ( e )
        {
            result = 'ERROR (see console)';
            console.error( e );
        }

        $result.text( JSON.stringify( result ) );
    },


    /**
     * Append button that allows for the creation of additional calc rows and a
     * clear button
     *
     * @return {undefined}
     */
    'private _addButtons': function()
    {
        var _self = this;

        this._$content.append( $( '<div>' )
            .append( $( '<button>' )
                .text( '+' )
                .click( function()
                {
                    _self._addRow();

                    // move the button down to the bottom (quick and easy means
                    // of doing so)
                    $( this ).parents( 'div:first' )
                        .detach().appendTo( _self._$content );
                } )
            )
            .append( $( '<button>' )
                .text( 'Clear' )
                .click( function()
                {
                    _self._$content.find( 'div.row:not(:first)' ).remove();
                } )
            )
        );
    }
} );