<?php

/*
Plugin Name: SEO Optimized Images
Plugin URI: http://webriti.com
Description: The **SEO Optimized Images** plugin Seo Optmized Images Plugin lets you dynamically insert Seo Friendly alt attributes and title attributes to your Images .  Simply activate the plugin, provide the pattern and you are ready to go.
Version: 1.3.1
Author: priyanshu.mittal
Author URI: http://webriti.com


*/
	add_filter('the_content', 'soi_replace_tags', 100);
//	add_filter();


function soi_replace_tags ($content, $alt_text='',$title='')
{


    global $post;

   $soi_options_array = get_option('soi_options_values');

   $alt_text = $soi_options_array['soi_alt_value'];
   $title_text = $soi_options_array['soi_title_value'];

   // get the post title for later use
   $post_title = esc_attr($post->post_title);

    // preapre the alt text


   // Check if we need to overide the default alt and existing alt text
   // We will set the flag 1 or 0

   //check setting for overinding alt tag
   $alt_flag = $soi_options_array['soi_override_alt_value'];

      //check setting for overinding title tag
   $title_flag = $soi_options_array['soi_override_title_value'];

   // Set the alt pattern




   // print_r($post);



    // This piece of code first finds all the images in the page
    // Then we proceed to finding missing or empty alt tags

     $soi_options_array = get_option('soi_options_values');

    // count number of images found in content
    $count = preg_match_all('/<img[^>]+>/i', $content, $images);


    // If we find images on the page then proceed to check the alt tags

   // We also need to calaculate the velue to be inserted in the tags based on user input


    if($count>0)
    {

        // Here we will set the alt value to be inserted.
        // $t = "$post_title"
        // we want to output like alt = "text"

        $t = 'alt = "'.$alt_text.'"';

        // we want to output like title = "text"
        $t_title = 'title = "'.$title_text.'"';


        foreach($images[0] as $img)
        {   // check if the alt tag exists in the image


        // Get the Name of Image Files.

        $output = preg_match_all( '/<img[^>]+src=[\'"]([^\'"]+)[\'"].*>/i', $img, $matches);

        $get_file_name = pathinfo($matches[1][0]);
        $image_file_name = $get_file_name['filename'];


        // Get post categories
        $postcategories = get_the_category();
        $post_category='';
        if ($postcategories) {
          foreach($postcategories as $category) {
            $post_category .= $category->name .' ';
          }
        }

        /// fetch the values of alt and title tags from the option panel
        $alt_text = $soi_options_array['soi_alt_value'];
       $title_text = $soi_options_array['soi_title_value'];

        // Replace the Values for alt tag

        $alt_text = str_replace('%title',$post_title,$alt_text );
        $alt_text = str_replace('%name',$image_file_name,$alt_text );
        $alt_text = str_replace('%category',$post_category,$alt_text );

        // replace the values for title tag.
        $title_text = str_replace('%title',$post_title,$title_text );
        $title_text = str_replace('%name',$image_file_name,$title_text );
        $title_text = str_replace('%category',$post_category,$title_text );

        //configure tags with specified values from option panel.
         $t = 'alt = "'.$alt_text.'"';
         $t_title =  'title = "'.$title_text.'"';

         //take the alt tag out from the image html markup
         $is_alt = preg_match_all('/alt="([^"]*)"/i', $img, $alt);



      ////////////////// check for alt tag /////////////////////////
        // In case there is not alt tag, create the tag and insert the value
         if ($alt_flag == "1")

            {
              // if alt tag is not present than insert the tag.
              if($is_alt == 0)
              {   $new_img = str_replace('<img ', '<img '.$t , $img);
                 $content = str_replace($img, $new_img, $content);
              }

              // if alt tag is present
              elseif($is_alt==1)

              {

               $text = trim($alt[1][0]);


              // Check if the alt text is empty.

                  if(empty($text))
                  {


                 $new_img = str_replace($alt[0][0], $t, $img);

                     $content = str_replace($img, $new_img, $content);
                 }




                 // Should we override the existing alt tag
                 if ($alt_flag == "1")

                 {

                   $new_img = str_replace($alt[0][0], $t, $img);

                   $content = str_replace($img, $new_img, $content);


                 }

              }
            }//////////////////// checked for alt tag ////////////////////

          ///////////////// check for title tag ///////////////////////////


       // first check weither title tag needs to be overide
       if($title_flag == "1"){

        if(!isset($new_img)) $new_img=$img; // when alt tag is not overridden, than , use actual image markup ie $new_img.

         $is_title = preg_match_all('/title="([^"]*)"/i', $new_img, $title);

         // check if title tag is not present in the img tag
            if($is_title == 0)
            {
               // create the title tag and insert the tag
               $final_img = str_replace('<img ', '<img '.$t_title , $new_img);
               $content = str_replace($new_img, $final_img, $content);

            } else {

            // you are here bcs title tags exsis and needs to be override
                $final_img = str_replace($title[0][0], $t_title, $new_img);
                $content = str_replace($new_img, $final_img, $content);
             }
        }
         ///////////////////// title tag checked ////////////////

        }
    }

    return $content;
}



	add_action('admin_menu', 'soi_add_menu_page');

function soi_add_menu_page()
{
add_menu_page( 'soi_settings_page', 'Seo Optimized Images', 'administrator', 'soi_setting','soi_create_setting_page','');
 }

 function soi_create_setting_page()
{
 require_once('seo-optimized-images-settings.php');
}


add_action( 'admin_enqueue_scripts', 'soi_load_custom_wp_admin_style' );

 function soi_load_custom_wp_admin_style($hook) {
   if ($hook != 'toplevel_page_soi_setting'){return;} // we dont want to load our css on other pages
        wp_register_style ('soi_custom_wp_admin_css', plugins_url('css/plugin-admin-panel.css', __FILE__));
        wp_enqueue_style( 'soi_custom_wp_admin_css' );
         wp_enqueue_style( 'wp-color-picker' ); // here we add the color picker style for use in our plugin

}



 function soi_load_custom_wp_admin_scripts($hook) {


  if ($hook != 'toplevel_page_soi_setting'){return;} // we dont want to load our js on other pages

  wp_register_script( 'soi_custom_wp_admin_js', plugin_dir_url( __FILE__ ) . 'js/plugin-admin-panel.js',array('jquery','jquery-ui-core','jquery-ui-tabs','wp-color-picker'), false, '1.0.0' );
 wp_enqueue_script ('soi_custom_wp_admin_js');


}
add_action( 'admin_enqueue_scripts', 'soi_load_custom_wp_admin_scripts' );