<?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
 */

/**
 * Renders table cells
 *
 * @access private
 * @package dompdf
 */
class Table_Cell_Renderer extends Block_Renderer {

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

  function render(Frame $frame) {
    $style = $frame->get_style();
    
    if ( trim($frame->get_node()->nodeValue) === "" && $style->empty_cells === "hide" ) {
      return;
    }

    $this->_set_opacity( $frame->get_opacity( $style->opacity ) );
    list($x, $y, $w, $h) = $frame->get_border_box();
    
    // Draw our background, border and content
    if ( ($bg = $style->background_color) !== "transparent" ) {
      $this->_canvas->filled_rectangle($x, $y, $w, $h, $bg);
    }

    if ( ($url = $style->background_image) && $url !== "none" ) {
      $this->_background_image($url, $x, $y, $w, $h, $style);
    }
    
    $table = Table_Frame_Decorator::find_parent_table($frame);

    if ( $table->get_style()->border_collapse !== "collapse" ) {
      $this->_render_border($frame);
      $this->_render_outline($frame);
      return;
    }

    // The collapsed case is slightly complicated...
    // @todo Add support for outlines here

    $cellmap  = $table->get_cellmap();
    $cells    = $cellmap->get_spanned_cells($frame);
    $num_rows = $cellmap->get_num_rows();
    $num_cols = $cellmap->get_num_cols();

    // Determine the top row spanned by this cell
    $i = $cells["rows"][0];
    $top_row = $cellmap->get_row($i);

    // Determine if this cell borders on the bottom of the table.  If so,
    // then we draw its bottom border.  Otherwise the next row down will
    // draw its top border instead.
    if (in_array( $num_rows - 1, $cells["rows"])) {
      $draw_bottom = true;
      $bottom_row = $cellmap->get_row($num_rows - 1);
    } else
      $draw_bottom = false;


    // Draw the horizontal borders
    foreach ( $cells["columns"] as $j ) {
      $bp = $cellmap->get_border_properties($i, $j);

      $y = $top_row["y"] - $bp["top"]["width"] / 2;

      $col = $cellmap->get_column($j);
      $x = $col["x"] - $bp["left"]["width"] / 2;
      $w = $col["used-width"] + ($bp["left"]["width"] + $bp["right"]["width"] ) / 2;

      if ( $bp["top"]["style"] !== "none" && $bp["top"]["width"] > 0 ) {
        $widths = array($bp["top"]["width"],
                        $bp["right"]["width"],
                        $bp["bottom"]["width"],
                        $bp["left"]["width"]);
        $method = "_border_". $bp["top"]["style"];
        $this->$method($x, $y, $w, $bp["top"]["color"], $widths, "top", "square");
      }

      if ( $draw_bottom ) {
        $bp = $cellmap->get_border_properties($num_rows - 1, $j);
        if ( $bp["bottom"]["style"] === "none" || $bp["bottom"]["width"] <= 0 )
          continue;

        $y = $bottom_row["y"] + $bottom_row["height"] + $bp["bottom"]["width"] / 2;

        $widths = array($bp["top"]["width"],
                        $bp["right"]["width"],
                        $bp["bottom"]["width"],
                        $bp["left"]["width"]);
        $method = "_border_". $bp["bottom"]["style"];
        $this->$method($x, $y, $w, $bp["bottom"]["color"], $widths, "bottom", "square");

      }
    }

    $j = $cells["columns"][0];

    $left_col = $cellmap->get_column($j);

    if (in_array($num_cols - 1, $cells["columns"])) {
      $draw_right = true;
      $right_col = $cellmap->get_column($num_cols - 1);
    } else
      $draw_right = false;

    // Draw the vertical borders
    foreach ( $cells["rows"] as $i ) {
      $bp = $cellmap->get_border_properties($i, $j);

      $x = $left_col["x"] - $bp["left"]["width"] / 2;

      $row = $cellmap->get_row($i);

      $y = $row["y"] - $bp["top"]["width"] / 2;
      $h = $row["height"] + ($bp["top"]["width"] + $bp["bottom"]["width"])/ 2;

      if ( $bp["left"]["style"] !== "none" && $bp["left"]["width"] > 0 ) {

        $widths = array($bp["top"]["width"],
                        $bp["right"]["width"],
                        $bp["bottom"]["width"],
                        $bp["left"]["width"]);

        $method = "_border_" . $bp["left"]["style"];
        $this->$method($x, $y, $h, $bp["left"]["color"], $widths, "left", "square");
      }

      if ( $draw_right ) {
        $bp = $cellmap->get_border_properties($i, $num_cols - 1);
        if ( $bp["right"]["style"] === "none" || $bp["right"]["width"] <= 0 )
          continue;

        $x = $right_col["x"] + $right_col["used-width"] + $bp["right"]["width"] / 2;

        $widths = array($bp["top"]["width"],
                        $bp["right"]["width"],
                        $bp["bottom"]["width"],
                        $bp["left"]["width"]);

        $method = "_border_" . $bp["right"]["style"];
        $this->$method($x, $y, $h, $bp["right"]["color"], $widths, "right", "square");

      }
    }

  }
}
