<?php

namespace AdnKronos\Import;

use AdnKronos\Psr\Log\LoggerInterface;

/**
 * Downloads an image from a URL and attaches it as the featured image of a post.
 */
class ImageImporter {

    /** @var LoggerInterface */
    private $logger;

    public function __construct(LoggerInterface $logger) {
        $this->logger = $logger;
    }

    /**
     * @param int    $postId
     * @param string $imageUrl
     * @param string $photoName  Used as the filename base (without extension)
     * @param string $ownerEmail
     */
    public function import($postId, $imageUrl, $photoName, $ownerEmail) {
        $imageOwner    = get_user_by('email', $ownerEmail);
        $imageAuthorId = $imageOwner ? $imageOwner->ID : 0;
        if (!$imageOwner && !empty($ownerEmail)) {
            $this->logger->warning('ImageImporter: owner not found for email [' . $ownerEmail . '], using author ID 0');
        }

        $http  = new \WP_Http();
        $photo = $http->request($imageUrl, array('timeout' => 10));

        if (!is_array($photo)) {
            $this->logger->error('ImageImporter: download failed for ' . $imageUrl);
            return;
        }

        $lastModified = isset($photo['headers']['last-modified']) ? $photo['headers']['last-modified'] : null;
        $uploadDate   = $lastModified ? gmdate('Y-m', strtotime($lastModified)) : null;

        $attachment = wp_upload_bits($photoName . '.jpg', null, $photo['body'], $uploadDate);

        if (!empty($attachment['error'])) {
            $this->logger->error('ImageImporter: wp_upload_bits error: ' . $attachment['error']);
            return;
        }

        $filetype = wp_check_filetype(basename($attachment['file']), null);
        $postInfo = array(
            'post_mime_type' => $filetype['type'],
            'post_title'     => get_the_title($postId) . ' ',
            'post_content'   => '',
            'post_status'    => 'inherit',
            'post_author'    => $imageAuthorId,
        );

        $attachId = wp_insert_attachment($postInfo, $attachment['file'], $postId);

        if (!function_exists('wp_generate_attachment_metadata')) {
            require_once ABSPATH . 'wp-admin/includes/image.php';
        }

        $attachData = wp_generate_attachment_metadata($attachId, $attachment['file']);
        wp_update_attachment_metadata($attachId, $attachData);
        set_post_thumbnail($postId, $attachId);
    }

}