<?php


class WDWT_frontend_functions{


  public static function is_empty_thumb(){
    global $post;

    $thumb = get_post_custom_values("Image");
    return empty($thumb);
  }


  public static function the_title_max_charlength($charlength, $title=false) {
    
    if($title){
    }
    else{
      $title = the_title($before = '', $after = '', FALSE);
    }
    
    $title_length = mb_strlen($title);
    if($title_length <= $charlength){
      echo $title;
    }
    else{
      $limited_title = mb_substr($title, 0, $charlength);
      echo $limited_title . "...";
    }
    
  }



  public static function the_excerpt_max_charlength($charlength,$content=false) {
    
    if($content){
      $excerpt=$content;
    }
    else{
      $excerpt = get_the_excerpt();
    }
    $excerpt = strip_tags($excerpt);    
    $charlength++;
    
    if ( mb_strlen( $excerpt ) > $charlength ) {
      $subex = mb_substr( $excerpt, 0, $charlength - 5 );
      $exwords = explode( ' ', $subex );
      $excut = - ( mb_strlen( $exwords[ count( $exwords ) - 1 ] ) );
      if ( $excut < 0 ) {
        echo mb_substr( $subex, 0, $excut ).'...';
      } else {
        echo $subex.'...';
      }
    } 
    else {
      echo str_replace('[&hellip;]','',$excerpt);
    }
  }
  

  public static function remove_last_comma($string=''){
  
    if(substr($string,-1)==',')
      return substr($string, 0, -1);
    else
      return $string;
  
  }

  /**
 *
 *  Generate image for post thumbnail
 * 
 */


  public static function display_thumbnail($width, $height){

    if (has_post_thumbnail()) {
      the_post_thumbnail(array($width, $height));
    }
    elseif (self::is_empty_thumb()) {
      return self::first_image($width, $height); /*first image or no image placeholder*/
    } else {
      return '';
    }
  }

  public static function thumbnail($width, $height){
      if ( has_post_thumbnail()){
        the_post_thumbnail(array($width, $height));
      }
      elseif (self::is_empty_thumb()) {
        return '';
      }
    }


   /**
    *  Get first image of post for thumbnail
    */

  public static function  catch_that_image(){
      global $post, $posts;
    $first_img = array('src'=>'','image_catched'=>true);
      $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
    if(isset($matches [1] [0])){  
        $first_img['src'] = $matches [1] [0];
    }
      if (empty($first_img['src'])) {
          $first_img['src'] = WDWT_IMG.'default.png'; 
      $first_img['image_catched']=false;
      }
      return $first_img;
  }


  public static function first_image($width, $height,$url_or_img=0){
    $image_parametr = self::catch_that_image();
    $thumb = $image_parametr['src'];
    $class='';
    if(!$image_parametr['image_catched'])
      $class='class="no_image"';
      if ($thumb) {
          $str = "<img src=\"";
          $str .= $thumb;
          $str .= '"';
          $str .= 'alt="'.get_the_title().'" width="'.$width.'" height="'.$height.'" '.$class.' border="0" style="width:'.$width.'; height:'. $height.';" data-s="" />';
          return $str;
      }
  }

 /**
  * returns image tag with image
  * for containers of fixed size
  * image fitted, cropped, centered
  */

  public static function fixed_thumbnail($width, $height, $grab_image = true){
    
    $tumb_id = get_post_thumbnail_id( get_the_ID() );
    $thumb_url = wp_get_attachment_image_src($tumb_id,array($width,$height));
    $thumb_url = $thumb_url[0];
    if($grab_image) {
      if( !$thumb_url ) {
      $thumb_url = self::catch_that_image();
      $thumb_url = $thumb_url['src'];
      }
    }
    if($thumb_url){
      list($w, $h) = getimagesize($thumb_url);
      if($w == 0){
        $w=10;
      }
      if($h == 0){
        $h=10;
      }
      if($h/$w > $height/$width){
        $scale = $width / $w;
        $style_img = 'width:100%; height:auto; max-width:none; left:0; top:'. ( $height/2 - $h/2 * $scale) .'px;';
      }
      else {
        $scale = $height/ $h;
        $style_img = 'height:100%; width:auto; max-width:none; left:'. ( $width/2 -$w/2 * $scale) .'px;';
      } 
      return '<img class="wp-post-image" src="'.$thumb_url.'" alt="'.esc_attr(get_the_title()).'" style="'.$style_img.'" />';
    }
    else {
      return '';
    }
  }
  /**
  * returns image tag with image
  * fits width of container
  * height auto
  */

  public static function auto_thumbnail($grab_image = true){
    $tumb_id = get_post_thumbnail_id( get_the_ID() );
    $thumb_url = wp_get_attachment_image_src($tumb_id,'full');
    $thumb_url = $thumb_url[0];
    if($grab_image) {
      if( !$thumb_url ) {
      $thumb_url = self::catch_that_image();
      $thumb_url = $thumb_url['src'];
      }
    }
    if($thumb_url){
      return '<img class="wp-post-image" src="'.$thumb_url.'" alt="'.esc_attr(get_the_title()).'" style="width:100%;" />';
    }
    else {
      return '';
    }
  }

  /**
  *   @return url of first image in the post content, or empty string if has no image
  */

  public static function post_image_url(){

    $thumb_url = self::catch_that_image();
    if(isset( $thumb_url['image_catched'])){
      if(!$thumb_url['image_catched']){
      $thumb_url='';
      }
      else{
        $thumb_url=$thumb_url['src'];
      }
    }
     
    return $thumb_url;

  }



  public static  function post_nav() {
    global $post;
    $previous = ( is_attachment() ) ? get_post( $post->post_parent ) : get_adjacent_post( false, '', true );
    $next    = get_adjacent_post( false, '', false );

    if ( ! $next && ! $previous )
      return;
    ?>
      <nav class="page-navigation">
        <?php previous_post_link( '%link', '<span class="meta-nav">&larr;</span> %title' ); ?> 
        <?php next_post_link( '%link',  '%title <span class="meta-nav">&rarr;</span>'  ); ?>
      </nav>
    <?php
  }

  public static function posts_nav($wp_query) {
    
    ?>
      <nav class="page-navigation">
      <div class="nav-back" style="float:left;">
        <?php next_posts_link( _x('Older entries', '','portfolio-gallery' ), $wp_query->max_num_pages ); ?> 
        
      </div>
      <div class="nav-forward" style="float:right;">  
        
        <?php previous_posts_link( _x('Newer entries', '','portfolio-gallery' ) ); ?>
      </div>
      <div class="clear"></div>
      </nav>
    <?php
  }   


  public static function excerpt_more( $more ) {
    return '...';
  }

  public static function remove_more_jump_link($link){
    $offset = strpos($link, '#more-');
    if ($offset) {
        $end = strpos($link, '"', $offset);
    }
    if ($end) {
        $link = substr_replace($link, '', $offset, $end - $offset);
    }
    return $link;
  }



  public static function do_nothing($param=NULL){
    return $param;
  }



}