<?php
/**
 * This file is part of PHPPresentation - A pure PHP library for reading and writing
 * presentations documents.
 *
 * PHPPresentation is free software distributed under the terms of the GNU Lesser
 * General Public License version 3 as published by the Free Software Foundation.
 *
 * For the full copyright and license information, please read the LICENSE
 * file that was distributed with this source code. For the full list of
 * contributors, visit https://github.com/PHPOffice/PHPPresentation/contributors.
 *
 * @link        https://github.com/PHPOffice/PHPPresentation
 * @copyright   2009-2015 PHPPresentation contributors
 * @license     http://www.gnu.org/licenses/lgpl.txt LGPL version 3
 */

namespace PhpOffice\PhpPresentation\Shape;

use PhpOffice\PhpPresentation\AbstractShape;
use PhpOffice\PhpPresentation\GeometryCalculator;
use PHPOffice\PhpPresentation\ShapeContainerInterface;
use PhpOffice\PhpPresentation\Shape\Drawing;
use PhpOffice\PhpPresentation\Shape\RichText;
use PhpOffice\PhpPresentation\Shape\Table;

class Group extends AbstractShape implements ShapeContainerInterface
{
    /**
    * Collection of shapes
    *
    * @var \ArrayObject|\PhpOffice\PhpPresentation\AbstractShape[]
    */
    private $shapeCollection = null;

    /**
    * Extent X
    *
    * @var int
    */
    protected $extentX;

    /**
    * Extent Y
    *
    * @var int
    */
    protected $extentY;

    public function __construct()
    {
        parent::__construct();

        // For logic purposes.
        $this->offsetX = null;
        $this->offsetY = null;

        // Shape collection
        $this->shapeCollection = new \ArrayObject();
    }

    /**
    * Get collection of shapes
    *
     * @return \ArrayObject|AbstractShape[]
    */
    public function getShapeCollection()
    {
        return $this->shapeCollection;
    }

    /**
     * Add shape to slide
     *
     * @param  \PhpOffice\PhpPresentation\AbstractShape $shape
     * @return \PhpOffice\PhpPresentation\AbstractShape
     * @throws \Exception
     */
    public function addShape(AbstractShape $shape)
    {
        $shape->setContainer($this);

        return $shape;
    }

    /**
    * Get X Offset
    *
    * @return int
    */
    public function getOffsetX()
    {
        if ($this->offsetX === null) {
            $offsets = GeometryCalculator::calculateOffsets($this);
            $this->offsetX = $offsets[GeometryCalculator::X];
            $this->offsetY = $offsets[GeometryCalculator::Y];
        }

        return $this->offsetX;
    }

    /**
    * Ignores setting the X Offset, preserving the default behavior.
    *
    * @param  int                 $pValue
    * @return $this
    */
    public function setOffsetX($pValue = 0)
    {
        return $this;
    }

    /**
    * Get Y Offset
    *
    * @return int
    */
    public function getOffsetY()
    {
        if ($this->offsetY === null) {
            $offsets = GeometryCalculator::calculateOffsets($this);
            $this->offsetX = $offsets[GeometryCalculator::X];
            $this->offsetY = $offsets[GeometryCalculator::Y];
        }

        return $this->offsetY;
    }

    /**
    * Ignores setting the Y Offset, preserving the default behavior.
    *
    * @param  int                 $pValue
    * @return $this
    */
    public function setOffsetY($pValue = 0)
    {
        return $this;
    }

    /**
    * Get X Extent
    *
    * @return int
    */
    public function getExtentX()
    {
        if ($this->extentX === null) {
            $extents = GeometryCalculator::calculateExtents($this);
            $this->extentX = $extents[GeometryCalculator::X] - $this->getOffsetX();
            $this->extentY = $extents[GeometryCalculator::Y] - $this->getOffsetY();
        }

        return $this->extentX;
    }

    /**
    * Get Y Extent
    *
    * @return int
    */
    public function getExtentY()
    {
        if ($this->extentY === null) {
            $extents = GeometryCalculator::calculateExtents($this);
            $this->extentX = $extents[GeometryCalculator::X] - $this->getOffsetX();
            $this->extentY = $extents[GeometryCalculator::Y] - $this->getOffsetY();
        }

        return $this->extentY;
    }

    /**
    * Ignores setting the width, preserving the default behavior.
    *
    * @param  int                 $pValue
    * @return $this
    */
    public function setWidth($pValue = 0)
    {
        return $this;
    }

    /**
    * Ignores setting the height, preserving the default behavior.
    *
    * @param  int                 $pValue
    * @return $this
    */
    public function setHeight($pValue = 0)
    {
        return $this;
    }

    /**
     * Create rich text shape
     *
     * @return \PhpOffice\PhpPresentation\Shape\RichText
     * @throws \Exception
     */
    public function createRichTextShape()
    {
        $shape = new RichText();
        $this->addShape($shape);

        return $shape;
    }

    /**
     * Create line shape
     *
     * @param  int $fromX Starting point x offset
     * @param  int $fromY Starting point y offset
     * @param  int $toX Ending point x offset
     * @param  int $toY Ending point y offset
     * @return \PhpOffice\PhpPresentation\Shape\Line
     * @throws \Exception
     */
    public function createLineShape($fromX, $fromY, $toX, $toY)
    {
        $shape = new Line($fromX, $fromY, $toX, $toY);
        $this->addShape($shape);

        return $shape;
    }

    /**
     * Create chart shape
     *
     * @return \PhpOffice\PhpPresentation\Shape\Chart
     * @throws \Exception
     */
    public function createChartShape()
    {
        $shape = new Chart();
        $this->addShape($shape);

        return $shape;
    }

    /**
     * Create drawing shape
     *
     * @return \PhpOffice\PhpPresentation\Shape\Drawing\File
     * @throws \Exception
     */
    public function createDrawingShape()
    {
        $shape = new Drawing\File();
        $this->addShape($shape);

        return $shape;
    }

    /**
     * Create table shape
     *
     * @param  int $columns Number of columns
     * @return \PhpOffice\PhpPresentation\Shape\Table
     * @throws \Exception
     */
    public function createTableShape($columns = 1)
    {
        $shape = new Table($columns);
        $this->addShape($shape);

        return $shape;
    }
}