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<?php
/**
 * @package dompdf
 * @link    http://dompdf.github.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @author  Brian Sweeney <eclecticgeek@gmail.com>
 * @author  Fabien Ménager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace Dompdf\FrameDecorator;

use Dompdf\Dompdf;
use Dompdf\Frame;
use Dompdf\Exception;
use DOMText;
use Dompdf\FontMetrics;

/**
 * Decorates Frame objects for text layout
 *
 * @access  private
 * @package dompdf
 */
class Text extends AbstractFrameDecorator
{

    // protected members
    protected $_text_spacing;

    function __construct(Frame $frame, Dompdf $dompdf)
    {
        if (!$frame->is_text_node()) {
            throw new Exception("Text_Decorator can only be applied to #text nodes.");
        }

        parent::__construct($frame, $dompdf);
        $this->_text_spacing = null;
    }

    //........................................................................

    function reset()
    {
        parent::reset();
        $this->_text_spacing = null;
    }

    //........................................................................

    // Accessor methods
    function get_text_spacing()
    {
        return $this->_text_spacing;
    }

    function get_text()
    {
        // FIXME: this should be in a child class (and is incorrect)
//    if ( $this->_frame->get_style()->content !== "normal" ) {
//      $this->_frame->get_node()->data = $this->_frame->get_style()->content;
//      $this->_frame->get_style()->content = "normal";
//    }

//      Helpers::pre_r("---");
//      $style = $this->_frame->get_style();
//      var_dump($text = $this->_frame->get_node()->data);
//      var_dump($asc = utf8_decode($text));
//      for ($i = 0; $i < strlen($asc); $i++)
//        Helpers::pre_r("$i: " . $asc[$i] . " - " . ord($asc[$i]));
//      Helpers::pre_r("width: " . $this->_dompdf->getFontMetrics()->getTextWidth($text, $style->font_family, $style->font_size));

        return $this->_frame->get_node()->data;
    }

    //........................................................................

    // Vertical margins & padding do not apply to text frames

    // http://www.w3.org/TR/CSS21/visudet.html#inline-non-replaced:
    //
    // The vertical padding, border and margin of an inline, non-replaced box
    // start at the top and bottom of the content area, not the
    // 'line-height'. But only the 'line-height' is used to calculate the
    // height of the line box.
    function get_margin_height()
    {
        // This function is called in add_frame_to_line() and is used to
        // determine the line height, so we actually want to return the
        // 'line-height' property, not the actual margin box
        $style = $this->get_parent()->get_style();
        $font = $style->font_family;
        $size = $style->font_size;

        /*
        Helpers::pre_r('-----');
        Helpers::pre_r($style->line_height);
        Helpers::pre_r($style->font_size);
        Helpers::pre_r($this->_dompdf->getFontMetrics()->getFontHeight($font, $size));
        Helpers::pre_r(($style->line_height / $size) * $this->_dompdf->getFontMetrics()->getFontHeight($font, $size));
        */

        return ($style->line_height / ($size > 0 ? $size : 1)) * $this->_dompdf->getFontMetrics()->getFontHeight($font, $size);

    }

    function get_padding_box()
    {
        $pb = $this->_frame->get_padding_box();
        $pb[3] = $pb["h"] = $this->_frame->get_style()->height;

        return $pb;
    }
    //........................................................................

    // Set method
    function set_text_spacing($spacing)
    {
        $style = $this->_frame->get_style();

        $this->_text_spacing = $spacing;
        $char_spacing = $style->length_in_pt($style->letter_spacing);

        // Re-adjust our width to account for the change in spacing
        $style->width = $this->_dompdf->getFontMetrics()->getTextWidth($this->get_text(), $style->font_family, $style->font_size, $spacing, $char_spacing);
    }

    //........................................................................

    // Recalculate the text width
    function recalculate_width()
    {
        $style = $this->get_style();
        $text = $this->get_text();
        $size = $style->font_size;
        $font = $style->font_family;
        $word_spacing = $style->length_in_pt($style->word_spacing);
        $char_spacing = $style->length_in_pt($style->letter_spacing);

        return $style->width = $this->_dompdf->getFontMetrics()->getTextWidth($text, $font, $size, $word_spacing, $char_spacing);
    }

    //........................................................................

    // Text manipulation methods

    // split the text in this frame at the offset specified.  The remaining
    // text is added a sibling frame following this one and is returned.
    function split_text($offset)
    {
        if ($offset == 0) {
            return null;
        }

        $split = $this->_frame->get_node()->splitText($offset);

        $deco = $this->copy($split);

        $p = $this->get_parent();
        $p->insert_child_after($deco, $this, false);

        if ($p instanceof Inline) {
            $p->split($deco);
        }

        return $deco;
    }

    //........................................................................

    function delete_text($offset, $count)
    {
        $this->_frame->get_node()->deleteData($offset, $count);
    }

    //........................................................................

    function set_text($text)
    {
        $this->_frame->get_node()->data = $text;
    }

}