<?php

namespace App\BackgroundImage;

use Qs_Application;
use Qs_Array;
use Qs_Doc;
use Qs_Options;
use Qs_ImageFs;
use Zend_Config;

class Item
{
    const DEFAULT_IMAGE = 'images/bg-body.jpg';

    /** @var bool|null */
    protected static $_enabled;

    /** @var \Zend_Config */
    protected static $_config;

    /**
     * @param array|Zend_Config $options
     */
    public function __construct($options = null)
    {
        Qs_Options::setOptions($this, $options);
        return $this;
    }

    public static function attach(Qs_Doc $doc, array $options = [])
    {
        if (self::getEnabled()) {
            $item = new self();
            if (Qs_Array::get($options, 'defaultImage') || !($image = $item->getImagePath())) {
                $image = self::DEFAULT_IMAGE;
            }
            $style = (array) $doc->getBodyAttrib('style');
            $style[] = sprintf($item->getConfig('styleAttribute'), htmlspecialchars($image));
            $doc->setBodyAttrib('style', implode('; ', $style));
        }
    }

    public static function getEnabled()
    {
        if (null === static::$_enabled) {
            static::$_enabled = (bool) static::getConfig('enabled');
        }
        return static::$_enabled;
    }

    public static function setEnabled($flag = true)
    {
        static::$_enabled = (bool) $flag;
    }

    public static function getConfig($field = null, $default = null)
    {
        if (null === static::$_config) {
            static::$_config = Qs_Application::getConfig('backgroundImage');
        }
        if (null === $field) {
            return static::$_config;
        }
        return static::$_config->get($field, $default);
    }

    public function getImagePath()
    {
        if (($image = Model::getRandomImage())) {
            $config = $this->getConfig('image')->toArray();
            return Qs_ImageFs::get(
                $image, $config['width'], $config['height'], $config['resizeMethodAlias']
            );
        }
        return null;
    }

}