<?php

class MediaListing_Basket {
    
    const CONF_BasketContents = 'basket.contents';
    
    protected $items;
    
    protected $cached_total_size = null;
    protected $source_prefixes = null;
    
    public function __construct() {
        $this->items = array();
        
        $this->restoreSession();
    }
    
    public function restoreSession() {
        $session = MediaListing_Main::instance()->session();
        if ($session->exists(static::CONF_BasketContents)) {
            $this->items = $session->get(static::CONF_BasketContents);
        }
    }
    
    public function saveSession() {
        $session = MediaListing_Main::instance()->session();
        $session->set(static::CONF_BasketContents, $this->items);
    }
    
    public function addItems($items) {
        if ( ! is_array($items)) {
            $items = array($items);
        }
        
        $this->items = array_merge($this->items, $items);
        $this->saveSession();
    }
    
    public function getItems() {
        return $this->items;
    }
    
    public function clear() {
        $this->items = array();
        $this->saveSession();
    }
    
    public function removeItems($items) {
        if ( ! is_array($items)) {
            $items = array($items);
        }
        
        $this->items = array_values(array_diff($this->items, $items));
        $this->saveSession();
    }
    
    public function count() {
        return count($this->items);
    }
    
    public function contains($item) {
        return in_array($item, $this->items);
    }
    
    protected function loadSourcePrefixes() {
        if ($this->source_prefixes !== null) {
            return;
        }
        
        $config = MediaListing_Main::instance()->config();
        $sources = $config->get('sources');
        $this->source_prefixes = array();
        foreach ($sources as $source_path) {
            list($name, $path) = explode(':', $source_path);
            $this->source_prefixes[$name] = $path;
        }

    }
    
    public function size($item) {
        $this->loadSourcePrefixes();
        
        list($source,$path) = explode(':', $item);
        return MediaListing_Main::recursiveFilesize($this->source_prefixes[$source] . '/' . $path);
    }
    
    public function totalSize() {
        if ($this->cached_total_size === null) {
            $this->cached_total_size = 0;
            
            $this->loadSourcePrefixes();
            foreach ($this->items as $item_path) {
                list($source,$path) = explode(':', $item_path);
                
                $this->cached_total_size += MediaListing_Main::recursiveFilesize($this->source_prefixes[$source] . '/' . $path);
            }
        }
        
        return $this->cached_total_size;
    }
    
}

?>