<?php
/**
 * Copyright 2002-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file LICENSE for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @author    Chuck Hagenbuch <chuck@horde.org>
 * @author    Mike Cochrane <mike@graftonhall.co.nz>
 * @author    Michael J. Rubinsky <mrubinsk@horde.org>
 * @category  Horde
 * @license   http://www.horde.org/licenses/lgpl21 LGPL-2.1
 * @package   Image
 */

/**
 * ImageMagick driver for the Horde_Image API.
 *
 * @author    Chuck Hagenbuch <chuck@horde.org>
 * @author    Mike Cochrane <mike@graftonhall.co.nz>
 * @author    Michael J. Rubinsky <mrubinsk@horde.org>
 * @category  Horde
 * @copyright 2002-2017 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL-2.1
 * @package   Image
 *
 * @property-read  Imagick $imagick  The underlaying Imagick object.
 */
class Horde_Image_Im extends Horde_Image_Base
{
    /**
     * Capabilites of this driver.
     *
     * @var string[]
     */
    protected $_capabilities = array(
        'arc',
        'canvas',
        'circle',
        'crop',
        'dashedLine',
        'flip',
        'grayscale',
        'line',
        'mirror',
        'multipage',
        'pdf',
        'polygon',
        'polyline',
        'rectangle',
        'resize',
        'rotate',
        'roundedRectangle',
        'sepia',
        'text',
    );

    /**
     * Operations to be performed before the source filename is specified on
     * the command line.
     *
     * @var array
     */
    protected $_operations = array();

    /**
     * Operations to be added after the source filename is specified on the
     * command line.
     *
     * @var array
     */
    protected $_postSrcOperations = array();

    /**
     * An array of temporary filenames that need to be unlinked at the end of
     * processing.
     *
     * Use addFileToClean() from client code (effects) to add files to this
     * array.
     *
     * @var array
     */
    protected $_toClean = array();

    /**
     * Path to the convert binary.
     *
     * @var string
     */
    protected $_convert = '';

    /**
     * Path to the identify binary.
     *
     * @var string
     */
    protected $_identify;

    /**
     * Cache for the number of image pages.
     *
     * @var integer
     */
    private $_pages;

    /**
     * The current page for the iterator.
     *
     * @var integer
     */
    private $_currentPage = 0;

    /**
     * Constructor.
     *
     * @see Horde_Image_Base::_construct
     */
    public function __construct($params, $context = array())
    {
        parent::__construct($params, $context);

        if (empty($context['convert'])) {
            throw new InvalidArgumentException(
                'A path to the convert binary is required.'
            );
        }
        $this->_convert = $context['convert'];
        if (!empty($context['identify'])) {
            $this->_identify = $context['identify'];
        }

        if (!empty($params['filename'])) {
            $this->loadFile($params['filename']);
        } elseif (!empty($params['data'])) {
            $this->loadString($params['data']);
        } else {
            $cmd = sprintf(
                '-size %dx%d xc:%s -strip %s:__FILEOUT__',
                $this->_width,
                $this->_height,
                escapeshellarg($this->_background),
                escapeshellarg($this->_type)
            );
            $this->executeConvertCmd($cmd);
        }
    }

    /**
     * Returns the raw data for this image.
     *
     * @param boolean $convert  If true, the image data will be returned in the
     *                          target format, independently from any image
     *                          operations.
     * @param array $options    Array of options:
     *     - stream: If true, return as a stream resource.
     *               DEFAULT: false.
     *
     * @return mixed  The raw image data either as a string or stream resource.
     */
    public function raw($convert = false, $options = array())
    {
        if (!empty($options['stream'])) {
            return $this->_raw($convert)->stream;
        }

        return $this->_raw($convert)->__toString();
    }

    /**
     * Returns the raw data for this image.
     *
     * @param boolean $convert         If true, the image data will be returned
     *                                 in the target format, independently from
     *                                 any image operations.
     * @param array $options           An array of options:
     *     - index: (integer) An image index.
     *     - preserve_data (boolean) If true, return the converted image but
     *         preserve the internal image data.
     *
     * @return Horde_Stream  The data, in a Horde_Stream object.
     */
    private function _raw($convert = false, $options = array())
    {
        $options = array_merge(
            array('index' => 0, 'preserve_data' => false),
            $options
        );

        if (empty($this->_data) ||
            // If there are no operations, and we already have data, don't
            // bother writing out files, just return the current data.
            (!$convert &&
             !count($this->_operations) &&
             !count($this->_postSrcOperations))) {
            return $this->_data;
        }

        $tmpin = $this->toFile($this->_data);
        $tmpout = Horde_Util::getTempFile('img', false, $this->_tmpdir);
        $command = $this->_convert . ' ' . implode(' ', $this->_operations)
            . ' "' . $tmpin . '"\'[' . (integer)$options['index'] . ']\' '
            . implode(' ', $this->_postSrcOperations)
            . ' -strip ' . escapeshellarg($this->_type) . ':"' . $tmpout . '" 2>&1';
        $this->_logDebug(sprintf("convert command executed by Horde_Image_im::raw(): %s", $command));
        exec($command, $output, $retval);
        if ($retval) {
            $error = sprintf("Error running command: %s", $command . "\n" . implode("\n", $output));
            $this->_logErr($error);
            throw new Horde_Image_Exception($error);
        }

        /* Empty the operations queue */
        $this->_operations = array();
        $this->_postSrcOperations = array();

        /* Load the result */
        $fp = fopen($tmpout, 'r');
        $return = new Horde_Stream_Temp();
        $return->add($fp, true);
        if (empty($options['preserve_data'])) {
            if ($this->_data) {
                $this->_data->close();
            }
            $this->_data = $return;
        }

        @unlink($tmpin);
        @unlink($tmpout);

        return $return;
    }

    /**
     * Resets the image data.
     */
    public function reset()
    {
        parent::reset();
        $this->_operations = array();
        $this->_postSrcOperations = array();
        $this->clearGeometry();
    }

    /**
     * Resizes the current image.
     *
     * @param integer $width        The new width.
     * @param integer $height       The new height.
     * @param boolean $ratio        Maintain original aspect ratio.
     * @param boolean $keepProfile  Keep the image meta data.
     */
    public function resize($width, $height, $ratio = true, $keepProfile = false)
    {
        $resWidth = $width * 2;
        $resHeight = $height * 2;
        $this->_operations[] = "-size {$resWidth}x{$resHeight}";
        if ($ratio) {
            $this->_postSrcOperations[] =
                ($keepProfile ? '-resize' : '-thumbnail')
                . sprintf(' %dx%d', $width, $height);
        } else {
            $this->_postSrcOperations[] =
                ($keepProfile ? '-resize' : '-thumbnail')
                . sprintf(' %dx%d!', $width, $height);
        }

        // Refresh the data
        $this->raw(false, array('stream' => true));

        // Reset the width and height instance variables since after resize we
        // don't know the *exact* dimensions yet (especially if we maintained
        // aspect ratio.
        $this->clearGeometry();
    }

    /**
     * Crops the current image.
     *
     * @param integer $x1  x for the top left corner.
     * @param integer $y1  y for the top left corner.
     * @param integer $x2  x for the bottom right corner.
     * @param integer $y2  y for the bottom right corner.
     */
    public function crop($x1, $y1, $x2, $y2)
    {
        $line = ($x2 - $x1) . 'x' . ($y2 - $y1) . '+' . (integer)$x1 . '+' . (integer)$y1;
        $this->_operations[] = '-crop ' . $line . ' +repage';

        // Reset width/height since these might change
        $this->raw(false, array('stream' => true));
        $this->clearGeometry();
    }

    /**
     * Rotates the current image.
     *
     * @param integer $angle       The angle to rotate the image by,
     *                             in the clockwise direction.
     * @param integer $background  The background color to fill any triangles.
     */
    public function rotate($angle, $background = 'white')
    {
        $this->raw(false, array('stream' => true));
        $this->_operations[] = sprintf(
            '-background %s -rotate %d',
            escapeshellarg($this->_background),
            (integer)$angle
        );
        $this->raw(false, array('stream' => true));

        // Reset width/height since these might have changed
        $this->clearGeometry();
    }

    /**
     * Flips the current image.
     */
    public function flip()
    {
        $this->_operations[] = '-flip';
    }

    /**
     * Mirrors the current image.
     */
    public function mirror()
    {
        $this->_operations[] = '-flop';
    }

    /**
     * Converts the current image to grayscale.
     */
    public function grayscale()
    {
        $this->_postSrcOperations[] = '-colorspace GRAY';
    }

    /**
     * Applies a sepia filter.
     *
     * @param integer $threshold  Extent of sepia effect.
     */
    public function sepia($threshold = 85)
    {
        $this->_operations[] = '-sepia-tone ' . (integer)$threshold . '%';
    }

    /**
     * Draws a text string on the image in a specified location, with the
     * specified style information.
     *
     * @TODO: Need to differentiate between the stroke (border) and the fill
     *        color, but this is a BC break, since we were just not providing a
     *        border.
     *
     * @param string $text        The text to draw.
     * @param integer $x          The left x coordinate of the start of the
     *                            text string.
     * @param integer $y          The top y coordinate of the start of the text
     *                            string.
     * @param string $font        The font identifier you want to use for the
     *                            text.
     * @param string $color       The color that you want the text displayed in.
     * @param integer $direction  An integer that specifies the orientation of
     *                            the text.
     * @param string $fontsize    Size of the font (small, medium, large, giant)
     */
    public function text(
        $string, $x, $y, $font = '', $color = 'black', $direction = 0,
        $fontsize = 'small'
    )
    {
        $string = addslashes($string);
        $fontsize = Horde_Image::getFontSize($fontsize);
        $command = 'text ' . (integer)$x . ',' . (integer)$y . ' ' . $string;
        $this->_postSrcOperations[] = '-fill ' . escapeshellarg($color)
            . (!empty($font) ? ' -font ' . escapeshellarg($font) : '')
            . sprintf(
                ' -pointsize %d -gravity northwest -draw "%s" -fill none',
                $fontsize, $command
            );
    }

    /**
     * Draws a circle.
     *
     * @param integer $x     The x coordinate of the centre.
     * @param integer $y     The y coordinate of the centre.
     * @param integer $r     The radius of the circle.
     * @param string $color  The line color of the circle.
     * @param string $fill   The color to fill the circle.
     */
    public function circle($x, $y, $r, $color, $fill = 'none')
    {
        $xMax = $x + $r;
        $this->_postSrcOperations[] = sprintf(
            '-stroke %s -fill %s -draw "circle %d,%d %d,%d" -stroke none -fill none',
            escapeshellarg($color), escapeshellarg($fill), $x, $y, $xMax, $y
        );
    }

    /**
     * Draws a polygon based on a set of vertices.
     *
     * @param array $vertices  An array of x and y labeled arrays
     *                         (eg. $vertices[0]['x'], $vertices[0]['y'], ...).
     * @param string $color    The color you want to draw the polygon with.
     * @param string $fill     The color to fill the polygon.
     */
    public function polygon($verts, $color, $fill = 'none')
    {
        $command = '';
        foreach ($verts as $vert) {
            $command .= sprintf(' %d,%d', $vert['x'], $vert['y']);
        }
        $this->_postSrcOperations[] = sprintf(
            '-stroke %s -fill %s -draw "polygon $command" -stroke none -fill none',
            escapeshellarg($color), escapeshellarg($fill)
        );
    }

    /**
     * Draws a rectangle.
     *
     * @param integer $x       The left x-coordinate of the rectangle.
     * @param integer $y       The top y-coordinate of the rectangle.
     * @param integer $width   The width of the rectangle.
     * @param integer $height  The height of the rectangle.
     * @param string $color    The line color of the rectangle.
     * @param string $fill     The color to fill the rectangle.
     */
    public function rectangle($x, $y, $width, $height, $color, $fill = 'none')
    {
        $xMax = $x + $width;
        $yMax = $y + $height;
        $this->_postSrcOperations[] = sprintf(
            '-stroke %s -fill %s -draw "rectangle %d,%d %d,%d" -stroke none -fill none',
            escapeshellarg($color), escapeshellarg($fill), $x, $y, $xMax, $yMax
        );

    }

    /**
     * Draws a rounded rectangle.
     *
     * @param integer $x       The left x-coordinate of the rectangle.
     * @param integer $y       The top y-coordinate of the rectangle.
     * @param integer $width   The width of the rectangle.
     * @param integer $height  The height of the rectangle.
     * @param integer $round   The width of the corner rounding.
     * @param string  $color   The line color of the rectangle.
     * @param string  $fill    The color to fill the rounded rectangle with.
     */
    public function roundedRectangle(
        $x, $y, $width, $height, $round, $color, $fill
    )
    {
        $x1 = $x + $width;
        $y1 = $y + $height;
        $this->_postSrcOperations[] = sprintf(
            '-stroke %s -fill %s -draw "roundRectangle %d,%d %d,%d %d,%d" -stroke none -fill none',
            escapeshellarg($color), escapeshellarg($fill), $x, $y, $x1, $y1, $round, $round
        );
    }

    /**
     * Draws a line.
     *
     * @param integer $x0     The x coordinate of the start.
     * @param integer $y0     The y coordinate of the start.
     * @param integer $x1     The x coordinate of the end.
     * @param integer $y1     The y coordinate of the end.
     * @param string $color   The line color.
     * @param string $width   The width of the line.
     */
    public function line($x0, $y0, $x1, $y1, $color = 'black', $width = 1)
    {
        $this->_operations[] = sprintf(
            '-stroke %s -strokewidth %d -draw "line %d,%d %d,%d"',
            escapeshellarg($color), $width, $x0, $y0, $x1, $y1
        );
    }

    /**
     * Draws a dashed line.
     *
     * @param integer $x0           The x co-ordinate of the start.
     * @param integer $y0           The y co-ordinate of the start.
     * @param integer $x1           The x co-ordinate of the end.
     * @param integer $y1           The y co-ordinate of the end.
     * @param string $color         The line color.
     * @param string $width         The width of the line.
     * @param integer $dash_length  The length of a dash on the dashed line
     * @param integer $dash_space   The length of a space in the dashed line
     */
    public function dashedLine(
        $x0, $y0, $x1, $y1, $color = 'black', $width = 1, $dash_length = 2,
        $dash_space = 2
    )
    {
        $this->_operations[] = sprintf(
            '-stroke %s -strokewidth %d -draw "line %d,%d %d,%d"',
            escapeshellarg($color), $width, $x0, $y0, $x1, $y1
        );
    }

    /**
     * Draws a polyline (a non-closed, non-filled polygon) based on a set of
     * vertices.
     *
     * @param array $vertices  An array of x and y labeled arrays
     *                         (eg. $vertices[0]['x'], $vertices[0]['y'], ...).
     * @param string $color    The color you want to draw the line with.
     * @param string $width    The width of the line.
     */
    public function polyline($verts, $color, $width = 1)
    {
        $command = '';
        foreach ($verts as $vert) {
            $command .= sprintf(' %d,%d', $vert['x'], $vert['y']);
        }
        $this->_operations[] = sprintf(
            '-stroke %s -strokewidth %d -fill none -draw "polyline $command" -strokewidth 1 -stroke none -fill none',
            escapeshellarg($color), $width
        );
    }

    /**
     * Draws an arc.
     *
     * @param integer $x      The x coordinate of the centre.
     * @param integer $y      The y coordinate of the centre.
     * @param integer $r      The radius of the arc.
     * @param integer $start  The start angle of the arc.
     * @param integer $end    The end angle of the arc.
     * @param string  $color  The line color of the arc.
     * @param string  $fill   The fill color of the arc (defaults to none).
     */
    public function arc(
        $x, $y, $r, $start, $end, $color = 'black', $fill = 'none'
    )
    {
        // Split up arcs greater than 180 degrees into two pieces.
        $this->_postSrcOperations[] = sprintf(
            '-stroke %s -fill %s',
            escapeshellarg($color), escapeshellarg($fill)
        );
        $mid = round(($start + $end) / 2);
        $x = round($x);
        $y = round($y);
        $r = round($r);
        if ($mid > 90) {
            $this->_postSrcOperations[] = sprintf(
                '-draw "ellipse %d,%d %d,%d %d,%d"',
                $x, $y, $r, $r, $start, $mid
            );
            $this->_postSrcOperations[] = sprintf(
                '-draw "ellipse %d,%d %d,%d %d,%d"',
                $x, $y, $r, $r, $mid, $end
            );
        } else {
            $this->_postSrcOperations[] = sprintf(
                '-draw "ellipse %d,%d %d,%d %d,%d"',
                $x, $y, $r, $r, $start, $end
            );
        }

        // If filled, draw the outline.
        if (!empty($fill)) {
            list($x1, $y1) = Horde_Image::circlePoint($start, $r * 2);
            list($x2, $y2) = Horde_Image::circlePoint($mid, $r * 2);
            list($x3, $y3) = Horde_Image::circlePoint($end, $r * 2);

            $verts = array(
                array('x' => $x + round($x3), 'y' => $y + round($y3)),
                array('x' => $x, 'y' => $y),
                array('x' => $x + round($x1), 'y' => $y + round($y1))
            );

            if ($mid > 90) {
                $verts1 = array(
                    array('x' => $x + round($x2), 'y' => $y + round($y2)),
                    array('x' => $x, 'y' => $y),
                    array('x' => $x + round($x1), 'y' => $y + round($y1))
                );
                $verts2 = array(
                    array('x' => $x + round($x3), 'y' => $y + round($y3)),
                    array('x' => $x, 'y' => $y),
                    array('x' => $x + round($x2), 'y' => $y + round($y2))
                );

                $this->polygon($verts1, $fill, $fill);
                $this->polygon($verts2, $fill, $fill);
            } else {
                $this->polygon($verts, $fill, $fill);
            }

            $this->polyline($verts, $color);

            $this->_postSrcOperations[] = '-stroke none -fill none';
        }
    }

    /**
     * Applies any effects in the effect queue.
     */
    public function applyEffects()
    {
        $this->raw(false, array('stream' => true));
        foreach ($this->_toClean as $tempfile) {
            @unlink($tempfile);
        }
    }

    /**
     * Method to execute a raw command directly in convert.
     *
     * Useful for executing more involved operations that may require multiple
     * convert commands piped into each other as could be needed by
     * Im based Horde_Image_Effect objects.
     *
     * The input and output files are quoted and substituted for __FILEIN__ and
     * __FILEOUT__ respectfully. In order to support piped convert commands,
     * the path to the convert command is substitued for __CONVERT__ (but the
     * initial convert command is added automatically).
     *
     * @param string $cmd    The command string, with substitutable tokens
     * @param array $values  Any values that should be substituted for tokens.
     */
    public function executeConvertCmd($cmd, $values = array())
    {
        // First, get a temporary file for the input
        if (strpos($cmd, '__FILEIN__') !== false) {
            $tmpin = $this->toFile($this->_data);
        } else {
            $tmpin = '';
        }

        // Now an output file
        $tmpout = Horde_Util::getTempFile('img', false, $this->_tmpdir);

        // Substitue them in the cmd string
        $cmd = str_replace(
            array('__FILEIN__', '__FILEOUT__', '__CONVERT__'),
            array('"' . $tmpin . '"', '"' . $tmpout . '"', $this->_convert),
            $cmd
        );

        //TODO: See what else needs to be replaced.
        $cmd = $this->_convert . ' ' . $cmd . ' 2>&1';

        // Log it
        $this->_logDebug(sprintf("convert command executed by Horde_Image_im::executeConvertCmd(): %s", $cmd));
        exec($cmd, $output, $retval);
        if ($retval) {
            $this->_logErr(sprintf("Error running command: %s", $cmd . "\n" . implode("\n", $output)));
        }
        $fp = fopen($tmpout, 'r');
        if ($this->_data) {
            $this->_data->close();
        }
        $this->_data = new Horde_Stream_Temp();
        $this->_data->add($fp, true);

        @unlink($tmpin);
        @unlink($tmpout);
    }

    /**
     * Returns the version of the convert command available.
     *
     * This needs to be publicly visable since it's used by various effects.
     *
     * @return string  A version string suitable for using in version_compare().
     */
    public function getIMVersion()
    {
        static $version = null;
        if (!is_array($version)) {
            $commandline = $this->_convert . ' --version';
            exec($commandline, $output, $retval);
            if (preg_match('/([0-9])\.([0-9])\.([0-9])/', $output[0], $matches)) {
                $version = $matches;
                return $matches;
            } else {
               return false;
            }
        }

        return $version;
    }

    public function addPostSrcOperation($operation)
    {
        $this->_postSrcOperations[] = $operation;
    }

    public function addOperation($operation)
    {
        $this->_operations[] = $operation;
    }

    public function addFileToClean($filename)
    {
        $this->_toClean[] = $filename;
    }

    public function getConvertPath()
    {
        return $this->_convert;
    }

    /**
     * Reset the imagick iterator to the first image in the set.
     *
     * @return void
     */
    public function rewind()
    {
        $this->_logDebug('Horde_Image_Im#rewind');
        $this->_currentPage = 0;
    }

    /**
     * Return the current image from the internal iterator.
     *
     * @return Horde_Image_Imagick
     */
    public function current()
    {
        $this->_logDebug('Horde_Image_Im#current');
        return $this->getImageAtIndex($this->_currentPage);
    }

    /**
     * Get the index of the internal iterator.
     *
     * @return integer
     */
    public function key()
    {
        $this->_logDebug('Horde_Image_Im#key');
        return $this->_currentPage;
    }

    /**
     * Advance the iterator
     *
     * @return Horde_Image_Im
     */
    public function next()
    {
        $this->_logDebug('Horde_Image_Im#next');
        $this->_currentPage++;
        if ($this->valid()) {
            return $this->getImageAtIndex($this->_currentPage);
        }
    }

    /**
     * Deterimines if the current iterator item is valid.
     *
     * @return boolean
     */
    public function valid()
    {
        return $this->_currentPage < $this->getImagePageCount();
    }

    /**
     * Request a specific image from the collection of images.
     *
     * @param integer $index  The index to return
     * @param boolean $flatten  If true, flatten the returned image using
     *                          $bgColor as the background color. Useful
     *                          for PDF files to remove transparency before
     *                          rendering.
     * @param string $bgColor   The background color to use when flattening the
     *                          image.
     * @return Horde_Image_Base
     */
    public function getImageAtIndex($index, $flatten = false, $bgColor = 'white')
    {
        $this->_logDebug('Horde_Image_Im#getImageAtIndex: ' . $index);

        if ($index > 0 && $index >= $this->getImagePageCount()) {
            throw new Horde_Image_Exception('Image index out of bounds.');
        }
        $rawImage = $this->_raw(true, array('index' => $index, 'preserve_data' => true));
        $image = new Horde_Image_Im(array('data' => $rawImage), $this->_context);

        if ($flatten) {
            $image->flattenImage($bgColor);
        }
        return $image;
    }

    /**
     * Flatten this image and remove transparency.
     *
     * @param string $bgColor  The background color to use.
     */
    public function flattenImage($bgColor = 'white')
    {
        $this->_postSrcOperations[] = sprintf('-background %s -flatten', $bgColor);
        $this->raw(false, array('stream' => true));
    }

    /**
     * Return the number of image pages available in the image object.
     *
     * @return integer
     */
    public function getImagePageCount()
    {
        if (is_null($this->_pages)) {
            $this->_pages = $this->_getImagePages();
        }
        $this->_logDebug('Horde_Image_Im#getImagePageCount: ' . $this->_pages);

        return $this->_pages;

    }

    private function _getImagePages()
    {
        $this->_logDebug('Horde_Image_Im#_getImagePages');
        $filename = $this->toFile();
        $cmd = $this->_identify . ' -format "%n " ' . $filename;
        $this->_logDebug($cmd);
        exec($cmd, $output, $retval);
        if ($retval) {
            $this->_logErr(sprintf("Error running command: %s", $cmd . "\n" . implode("\n", $output)));
        }
        $output = array_pop($output);
        $output = substr($output, 0, strpos($output, ' ') + 1);
        $this->_logDebug(print_r($output, true));
        unlink($filename);

        return $output;
    }
}