<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category	PHPExcel
 * @package		PHPExcel_Chart
 * @copyright	Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license		http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version		##VERSION##, ##DATE##
 */

/**
 * PHPExcel_Chart_Legend
 *
 * @category	PHPExcel
 * @package		PHPExcel_Chart
 * @copyright	Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Chart_Legend
{
    /** Legend positions */
    const xlLegendPositionBottom = -4107;	//	Below the chart.
    const xlLegendPositionCorner = 2;		//	In the upper right-hand corner of the chart border.
    const xlLegendPositionCustom = -4161;	//	A custom position.
    const xlLegendPositionLeft = -4131;	//	Left of the chart.
    const xlLegendPositionRight = -4152;	//	Right of the chart.
    const xlLegendPositionTop = -4160;	//	Above the chart.

    const POSITION_RIGHT = 'r';
    const POSITION_LEFT = 'l';
    const POSITION_BOTTOM = 'b';
    const POSITION_TOP = 't';
    const POSITION_TOPRIGHT = 'tr';

    private static $_positionXLref = [ self::xlLegendPositionBottom => self::POSITION_BOTTOM,
                                            self::xlLegendPositionCorner => self::POSITION_TOPRIGHT,
                                            self::xlLegendPositionCustom => '??',
                                            self::xlLegendPositionLeft => self::POSITION_LEFT,
                                            self::xlLegendPositionRight => self::POSITION_RIGHT,
                                            self::xlLegendPositionTop => self::POSITION_TOP,
                                          ];

    /**
     * Legend position
     *
     * @var	string
     */
    private $_position = self::POSITION_RIGHT;

    /**
     * Allow overlay of other elements?
     *
     * @var	bool
     */
    private $_overlay = true;

    /**
     * Legend Layout
     *
     * @var	PHPExcel_Chart_Layout
     */
    private $_layout = null;

    /**
     *	Create a new PHPExcel_Chart_Legend
     * @param mixed $position
     * @param mixed $overlay
     */
    public function __construct($position = self::POSITION_RIGHT, PHPExcel_Chart_Layout $layout = null, $overlay = false)
    {
        $this->setPosition($position);
        $this->_layout = $layout;
        $this->setOverlay($overlay);
    }

    /**
     * Get legend position as an excel string value
     *
     * @return	string
     */
    public function getPosition()
    {
        return $this->_position;
    }

    /**
     * Get legend position using an excel string value
     *
     * @param	string	$position
     */
    public function setPosition($position = self::POSITION_RIGHT)
    {
        if (!in_array($position, self::$_positionXLref, true)) {
            return false;
        }

        $this->_position = $position;

        return true;
    }

    /**
     * Get legend position as an Excel internal numeric value
     *
     * @return	number
     */
    public function getPositionXL()
    {
        return array_search($this->_position, self::$_positionXLref, true);
    }

    /**
     * Set legend position using an Excel internal numeric value
     *
     * @param	number	$positionXL
     */
    public function setPositionXL($positionXL = self::xlLegendPositionRight)
    {
        if (!array_key_exists($positionXL, self::$_positionXLref)) {
            return false;
        }

        $this->_position = self::$_positionXLref[$positionXL];

        return true;
    }

    /**
     * Get allow overlay of other elements?
     *
     * @return	bool
     */
    public function getOverlay()
    {
        return $this->_overlay;
    }

    /**
     * Set allow overlay of other elements?
     *
     * @param	bool	$overlay
     * @return	bool
     */
    public function setOverlay($overlay = false)
    {
        if (!is_bool($overlay)) {
            return false;
        }

        $this->_overlay = $overlay;

        return true;
    }

    /**
     * Get Layout
     *
     * @return PHPExcel_Chart_Layout
     */
    public function getLayout()
    {
        return $this->_layout;
    }
}
