Migration from Mailpoet 2 to Mailpoet 3 : phase 0

Interface

lib/Util/ProgressBar.php

@@ -0,0 +1,97 @@
+<?php
+namespace MailPoet\Util;
+
+use MailPoet\Config\Env;
+
+if(!defined('ABSPATH')) exit;
+
+if ( !class_exists('ProgressBar', false) ) {
+
+	/**
+	 * The Progress Bar class
+	 *
+	 */
+	class ProgressBar {
+		
+		private $total_count = 0;
+		private $current_count = 0;
+		private $filename;
+		public $url;
+		
+		/**
+		 * Initialize the class and set its properties.
+		 *
+		 */
+		public function __construct($progress_bar_id) {
+			$upload_dir = wp_upload_dir();
+			$filename = Env::$plugin_name . '-' . $progress_bar_id . '-progress.json';
+			$this->filename = $upload_dir['basedir'] . '/' . $filename;
+			$this->url = $upload_dir['baseurl'] . '/' . $filename;
+			$counters = $this->read_progress();
+			if ( isset($counters->total) ) {
+				$this->total_count = $counters->total;
+			}
+			if ( isset($counters->current) ) {
+				$this->current_count = $counters->current;
+			}
+		}
+		
+		/**
+		 * Get the progress file URL
+		 * 
+		 * @return string Progress file URL
+		 */
+		public function get_url() {
+			return $this->url;
+		}
+		
+		/**
+		 * Read the progress counters
+		 * 
+		 * @return array|false Array of counters
+		 */
+		private function read_progress() {
+			if ( file_exists($this->filename) ) {
+				$json_content = file_get_contents($this->filename);
+				return json_decode($json_content);
+			} else {
+				return false;
+			}
+		}
+		
+		/**
+		 * Set the total count
+		 * 
+		 * @param int $count Count
+		 */
+		public function set_total_count($count) {
+			if ( $count != $this->total_count ) {
+				$this->total_count = $count;
+				$this->current_count = 0;
+				$this->save_progress();
+			}
+		}
+		
+		/**
+		 * Increment the current count
+		 * 
+		 * @param int $count Count
+		 */
+		public function increment_current_count($count) {
+			$this->current_count += $count;
+			$this->save_progress();
+		}
+		
+		/**
+		 * Save the progress counters
+		 * 
+		 */
+		private function save_progress() {
+			file_put_contents($this->filename, json_encode(array(
+				'total'		=> $this->total_count,
+				'current'	=> $this->current_count,
+			)));
+			
+		}
+	}
+}