<?php
/**
 * @package dompdf
 * @link    http://dompdf.github.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */

/**
 * Decorates frames for block layout
 *
 * @access private
 * @package dompdf
 */
class Block_Frame_Decorator extends Frame_Decorator {
  /**
   * Current line index
   *
   * @var int
   */
  protected $_cl;
  
  /**
   * The block's line boxes
   * 
   * @var Line_Box[]
   */
  protected $_line_boxes;

  function __construct(DP_Frame $frame, DOMPDF $dompdf) {
    parent::__construct($frame, $dompdf);
    
    $this->_line_boxes = array(new Line_Box($this));
    $this->_cl = 0;
  }

  function reset() {
    parent::reset();
    
    $this->_line_boxes = array(new Line_Box($this));
    $this->_cl = 0;
  }

  /**
   * @return Line_Box
   */
  function get_current_line_box() {
    return $this->_line_boxes[$this->_cl];
  }

  /**
   * @return integer
   */
  function get_current_line_number() {
    return $this->_cl;
  }

  /**
   * @return Line_Box[]
   */
  function get_line_boxes() { 
    return $this->_line_boxes; 
  }

  /**
   * @param integer $i
   */
  function clear_line($i) {
    if ( isset($this->_line_boxes[$i]) ) {
      unset($this->_line_boxes[$i]);
    }
  }

  /**
   * @param DP_Frame $frame
   */
  function add_frame_to_line(DP_Frame $frame) {
    if ( !$frame->is_in_flow() ) {
      return;
    }
    
    $style = $frame->get_style();
    
    $frame->set_containing_line($this->_line_boxes[$this->_cl]);
    
    /*
    // Adds a new line after a block, only if certain conditions are met
    if ((($frame instanceof Inline_Frame_Decorator && $frame->get_node()->nodeName !== "br") || 
          $frame instanceof Text_Frame_Decorator && trim($frame->get_text())) && 
        ($frame->get_prev_sibling() && $frame->get_prev_sibling()->get_style()->display === "block" && 
         $this->_line_boxes[$this->_cl]->w > 0 )) {
           
           $this->maximize_line_height( $style->length_in_pt($style->line_height), $frame );
           $this->add_line();
         
           // Add each child of the inline frame to the line individually
           foreach ($frame->get_children() as $child)
             $this->add_frame_to_line( $child );     
    }
    else*/

    // Handle inline frames (which are effectively wrappers)
    if ( $frame instanceof Inline_Frame_Decorator ) {

      // Handle line breaks
      if ( $frame->get_node()->nodeName === "br" ) {
        $this->maximize_line_height( $style->length_in_pt($style->line_height), $frame );
        $this->add_line(true);
      }

      return;
    }

    // Trim leading text if this is an empty line.  Kinda a hack to put it here,
    // but what can you do...
    if ( $this->get_current_line_box()->w == 0 &&
         $frame->is_text_node() &&
        !$frame->is_pre() ) {

      $frame->set_text( ltrim($frame->get_text()) );
      $frame->recalculate_width();
    }

    $w = $frame->get_margin_width();

    if ( $w == 0 ) {
      return;
    }

    // Debugging code:
    /*
    pre_r("\n<h3>Adding frame to line:</h3>");

    //    pre_r("Me: " . $this->get_node()->nodeName . " (" . spl_object_hash($this->get_node()) . ")");
    //    pre_r("Node: " . $frame->get_node()->nodeName . " (" . spl_object_hash($frame->get_node()) . ")");
    if ( $frame->is_text_node() )
      pre_r('"'.$frame->get_node()->nodeValue.'"');

    pre_r("Line width: " . $this->_line_boxes[$this->_cl]->w);
    pre_r("Frame: " . get_class($frame));
    pre_r("Frame width: "  . $w);
    pre_r("Frame height: " . $frame->get_margin_height());
    pre_r("Containing block width: " . $this->get_containing_block("w"));
    */
    // End debugging

    $line = $this->_line_boxes[$this->_cl];
    if ( $line->left + $line->w + $line->right + $w > $this->get_containing_block("w")) {
      $this->add_line();
    }

    $frame->position();

    $current_line = $this->_line_boxes[$this->_cl];
    $current_line->add_frame($frame);

    if ( $frame->is_text_node() ) {
      $current_line->wc += count(preg_split("/\s+/", trim($frame->get_text())));
    }

    $this->increase_line_width($w);
    
    $this->maximize_line_height($frame->get_margin_height(), $frame);
  }

  function remove_frames_from_line(DP_Frame $frame) {
    // Search backwards through the lines for $frame
    $i = $this->_cl;
    $j = null;

    while ($i >= 0) {
      if ( ($j = in_array($frame, $this->_line_boxes[$i]->get_frames(), true)) !== false ) {
        break;
      }
      
      $i--;
    }

    if ( $j === false ) {
      return;
    }

    // Remove $frame and all frames that follow
    while ($j < count($this->_line_boxes[$i]->get_frames())) {
      $frames = $this->_line_boxes[$i]->get_frames();
      $f = $frames[$j];
      $frames[$j] = null;
      unset($frames[$j]);
      $j++;
      $this->_line_boxes[$i]->w -= $f->get_margin_width();
    }

    // Recalculate the height of the line
    $h = 0;
    foreach ($this->_line_boxes[$i]->get_frames() as $f) {
      $h = max( $h, $f->get_margin_height() );
    }

    $this->_line_boxes[$i]->h = $h;

    // Remove all lines that follow
    while ($this->_cl > $i) {
      $this->_line_boxes[ $this->_cl ] = null;
      unset($this->_line_boxes[ $this->_cl ]);
      $this->_cl--;
    }
  }

  function increase_line_width($w) {
    $this->_line_boxes[ $this->_cl ]->w += $w;
  }

  function maximize_line_height($val, DP_Frame $frame) {
    if ( $val > $this->_line_boxes[ $this->_cl ]->h ) {
      $this->_line_boxes[ $this->_cl ]->tallest_frame = $frame;
      $this->_line_boxes[ $this->_cl ]->h = $val;
    }
  }

  function add_line($br = false) {

//     if ( $this->_line_boxes[$this->_cl]["h"] == 0 ) //count($this->_line_boxes[$i]["frames"]) == 0 ||
//       return;

    $this->_line_boxes[$this->_cl]->br = $br;
    $y = $this->_line_boxes[$this->_cl]->y + $this->_line_boxes[$this->_cl]->h;

    $new_line = new Line_Box($this, $y);
    
    $this->_line_boxes[ ++$this->_cl ] = $new_line;
  }

  //........................................................................
}
