<?php

namespace Grav\Plugin\Aura;

use Grav\Common\Flex\Types\Pages\PageObject;
use Grav\Common\Grav;

class Aura
{
    private $org;
    private $website;
    public $webpage;
    private $person;
    private $grav;

    private $otherPresence = [
        'facebook-url',
        'instagram-url',
        'linkedin-url',
        'pinterest-url',
        'youtube-url',
        'wikipedia-url',
        'website-url',
    ];

    /**
     * Initializes Aura variables for the page
     *
     * @param PageObject $page
     */
    public function __construct($page)
    {
        $this->grav = $cache = Grav::instance();

        $this->setOrg();
        $this->setWebsite();
        $this->setWebPage($page);
        $this->setAuthor($page);
    }

    public function generateOpenGraphMeta()
    {
        $data = [
            'og:url'   => $this->webpage->url,
            'og:type'  => $this->webpage->type,
            'og:title' => $this->webpage->title,
        ];

        if ($this->webpage->description) {
            $data['og:description'] = $this->webpage->description;
        }

        if ($this->webpage->image) {
            $data['og:image']        = $this->webpage->image->url;
            $data['og:image:type']   = $this->webpage->image->type;
            $data['og:image:width']  = $this->webpage->image->width;
            $data['og:image:height'] = $this->webpage->image->height;
        }

        if ($this->grav['config']->get('plugins.aura.org-facebook-appid')) {
            $data['fb:app_id'] = $this->grav['config']->get('plugins.aura.org-facebook-appid');
        }

        if ($this->person) {
            $data['og:author'] = $this->person->name;
        } else {
            $data['og:author'] = $this->org->name;
        }

        foreach ($data as $property => $content) {
            $this->webpage->metadata[$property] = [
                'property' => $property,
                'content'  => $content,
            ];
        }
    }

    public function generateTwitterMeta()
    {
        $data = [
            'twitter:card'  => 'summary_large_image',
            'twitter:title' => $this->webpage->title,
        ];

        if ($this->webpage->description) {
            $data['twitter:description'] = $this->webpage->description;
        }

        if ($this->grav['config']->get('plugins.aura.org-twitter-user')) {
            $data['twitter:site'] = '@' . $this->grav['config']->get('plugins.aura.org-twitter-user');
        }

        if ($this->person && $this->person->twitterUser) {
            $data['twitter:creator'] = '@' . $this->person->twitterUser;
        } else {
            if ($this->grav['config']->get('plugins.aura.org-twitter-user')) {
                $data['twitter:creator'] = '@' . $this->grav['config']->get('plugins.aura.org-twitter-user');
            }
        }

        if ($this->webpage->image) {
            $data['twitter:image'] = $this->webpage->image->url;
        }

        foreach ($data as $name => $content) {
            $this->webpage->metadata[$name] = [
                'name'    => $name,
                'content' => $content,
            ];
        }
    }

    public function generateLinkedInMeta()
    {
        $data = [
            'article:published_time' => $this->webpage->datePublished,
            'article:modified_time'  => $this->webpage->dateModified,
        ];

        if ($this->person) {
            $data['article:author'] = $this->person->name;
        } else {
            $data['article:author'] = $this->org->name;
        }

        foreach ($data as $property => $content) {
            $this->webpage->metadata[$property] = [
                'property' => $property,
                'content'  => $content,
            ];
        }
    }

    public function generateStructuredData()
    {
        $organization = [
            '@type' => 'Organization',
            '@id'   => $this->org->id,
            'name'  => $this->org->name,
            'url'   => $this->org->url,
        ];

        $website = [
            '@type'     => 'WebSite',
            '@id'       => $this->website->id,
            'url'       => $this->website->url,
            'name'      => $this->website->name,
            'publisher' => [
                '@id' => $this->org->id,
            ],
        ];

        $webpage = [
            '@type'         => 'WebPage',
            '@id'           => $this->webpage->id,
            'url'           => $this->webpage->url,
            'inLanguage'    => $this->webpage->language,
            'name'          => $this->webpage->title,
            'isPartOf'      => [
                '@id' => $this->website->id,
            ],
            'datePublished' => $this->webpage->datePublished,
            'dateModified'  => $this->webpage->dateModified,
        ];

        // Add Organization sameAs (if defined)
        if ($this->org->sameAs) {
            $organization['sameAs'] = $this->org->sameAs;
        }

        // Add logo (if defined)
        if ($this->org->logo) {
            $organization['logo'] = [
                '@type'   => 'ImageObject',
                '@id'     => $this->org->logo->id,
                'url'     => $this->org->logo->url,
                'width'   => $this->org->logo->width,
                'height'  => $this->org->logo->height,
                'caption' => $this->org->logo->caption,
            ];

            $organization['image'] = [
                '@id' => $this->org->logo->id,
            ];
        }

        // Add page description (if defined)
        if ($this->webpage->description) {
            $webpage['description'] = $this->webpage->description;
        }

        // Add page image (if defined)
        if ($this->webpage->image) {
            $webpageImage = [
                '@type'   => 'ImageObject',
                '@id'     => $this->webpage->image->id,
                'url'     => $this->webpage->image->url,
                'width'   => $this->webpage->image->width,
                'height'  => $this->webpage->image->height,
                'caption' => $this->webpage->image->caption,
            ];

            $webpage['primaryImageOfPage'] = [
                '@id' => $this->webpage->image->id,
            ];
        }

        // Additional based on page type i.e. article
        if ($this->webpage->type == 'article') {
            $article = [
                '@type'            => 'Article',
                '@id'              => $this->webpage->url . '#article',
                'isPartOf'         => [
                    '@id' => $this->webpage->id,
                ],
                'headline'         => $this->webpage->title,
                'datePublished'    => $this->webpage->datePublished,
                'dateModified'     => $this->webpage->dateModified,
                'mainEntityOfPage' => [
                    '@id' => $this->webpage->id,
                ],
                'publisher'        => [
                    '@id' => $this->org->id,
                ],
            ];

            // Add Image
            if ($this->webpage->image) {
                $article['image'] = [
                    '@id' => $this->webpage->image->id,
                ];
            }

            // Add Author
            if ($this->person) {
                // Use Person (if defined)
                $person = [
                    '@type' => 'Person',
                    '@id'   => $this->person->id,
                    'name'  => $this->person->name,
                ];

                // Add Person description (if defined)
                if ($this->person->description) {
                    $person['description'] = $this->person->description;
                }

                // Add Person sameAs (if defined)
                if ($this->person->sameAs) {
                    $person['sameAs'] = $this->person->sameAs;
                }

                // Add Person image (if defined)
                if ($this->person->image) {
                    $person['image'] = [
                        '@type'   => 'ImageObject',
                        '@id'     => $this->person->image->id,
                        'url'     => $this->person->image->url,
                        'width'   => $this->person->image->width,
                        'height'  => $this->person->image->height,
                        'caption' => $this->person->image->caption,
                    ];
                }

                $article['author'] = [
                    '@id' => $this->person->id,
                ];
            } else {
                // Use Organization
                $article['author'] = [
                    '@id' => $this->org->id,
                ];
            }
        }

        // Build the empty structured data block
        $data = [
            '@context' => 'https://schema.org',
            '@graph'   => [],
        ];

        // Add the elements in order
        $data['@graph'][] = $organization;
        $data['@graph'][] = $website;

        if (isset($webpageImage)) {
            $data['@graph'][] = $webpageImage;
        }

        $data['@graph'][] = $webpage;

        if (isset($article)) {
            $data['@graph'][] = $article;
        }

        if (isset($person)) {
            $data['@graph'][] = $person;
        }

        return json_encode($data, JSON_UNESCAPED_SLASHES);
    }

    /**
     * @return void
     */
    protected function setOrg(): void
    {
        $this->org = new Organization();

        $this->org->url  = (string)$this->grav['config']->get('plugins.aura.org-url');
        $this->org->id   = $this->org->url . '#organization';
        $this->org->name = $this->grav['config']->get('plugins.aura.org-name');

        // Org SameAs
        $sameAs = [];

        foreach ($this->otherPresence as $platform) {
            $key = 'plugins.aura.org-' . $platform;

            if ($this->grav['config']->get($key)) {
                $sameAs[] = $this->grav['config']->get($key);
            }
        }

        $key = 'plugins.aura.org-twitter-user';

        if ($this->grav['config']->get($key)) {
            $sameAs[] = 'https://twitter.com/' . $this->grav['config']->get($key);
        }

        if (!empty($sameAs)) {
            $this->org->sameAs = $sameAs;
        }

        $this->setOrgLogo();
    }

    /**
     * @return void
     */
    protected function setOrgLogo(): void
    {
        // Org Logo
        if ($this->grav['config']->get('plugins.aura.org-logo')) {
            $imageArray = $this->grav['config']->get('plugins.aura.org-logo');
            $firstImage = reset($imageArray);
            $imagePath  = ROOT_DIR . $firstImage['path'];

            if (file_exists($imagePath)) {
                $size                     = getimagesize($imagePath);
                $this->org->logo          = new Image();
                $this->org->logo->url     = $this->grav['base_url_absolute'] . '/' . $firstImage['path'];
                $this->org->logo->id      = $this->org->url . '#logo';
                $this->org->logo->width   = $size[0];
                $this->org->logo->height  = $size[1];
                $this->org->logo->caption = $this->org->name;
                $this->org->logo->type    = $size['mime'];
            }
        }
    }

    /**
     * @return void
     */
    protected function setWebsite(): void
    {
        $this->website = new WebSite;

        $this->website->url  = $this->grav['base_url_absolute'];
        $this->website->id   = $this->website->url . '#website';
        $this->website->name = $this->grav['config']->get('site.title');
    }

    /**
     * @param PageObject $page
     *
     * @return mixed
     */
    protected function setWebPage($page)
    {
        $this->webpage = new WebPage;

        $this->webpage->url   = $page->url(true);
        $this->webpage->id    = $this->webpage->url . '#webpage';
        $this->webpage->title = $page->title() . ' | ' . $this->grav['config']->get('site.title');

        $header = $page->header();

        if (isset($header->aura['description']) && $header->aura['description'] != '') {
            $this->webpage->description = (string)$header->aura['description'];
        }

        if (isset($header->language) && $header->language != '') {
            $this->webpage->language = $header->language;
        } else {
            $this->webpage->language = $this->grav['language']->getActive();

            if (!$this->webpage->language) {
                $this->webpage->language = $this->grav['config']->get('site.default_lang');
            }
        }

        $datePublishedRaw = time();

        if ($page->publishDate()) {
            $datePublishedRaw = $page->publishDate();
        } elseif ($page->date()) {
            $datePublishedRaw = $page->date();
        } elseif ($page->modified()) {
            $datePublishedRaw = $page->modified();
        }

        $dateModifiedRaw              = $page->modified() ? $page->modified() : time();
        $this->webpage->datePublished = date('c', $datePublishedRaw);
        $this->webpage->dateModified  = date('c', $dateModifiedRaw);

        $this->setWebpageImage($page);

        if ((isset($header->aura['pagetype'])) && ($header->aura['pagetype'] != '')) {
            $this->webpage->type = $header->aura['pagetype'];
        }
    }

    /**
     * @param PageObject $page
     *
     * @return void
     */
    protected function setWebpageImage($page): void
    {
        $image = null;
        $header = $page->header();

        if (isset($header->aura['image']) && $header->aura['image'] !== '') {
            $image = $page->media()->images()[$header->aura['image']] ?? null;
        } elseif (isset($header->media_order) && $header->media_order !== '') {
            $images = explode(',', $header->media_order);

            if (is_array($images) && !empty($images)) {
                $image = $page->media()->images()[reset($images)] ?? null;
            }
        }

        if ($image !== null) {
            $url_data = array_merge(
                parse_url($this->grav->get('base_url_absolute')),
                parse_url($image->url())
            );

            $url = call_user_func(
                static function (array $parts) {
                    return (isset($parts['scheme']) ? "{$parts['scheme']}:" : '') .
                        ((isset($parts['user']) || isset($parts['host'])) ? '//' : '') .
                        (isset($parts['user']) ? (string)($parts['user']) : '') .
                        (isset($parts['pass']) ? ":{$parts['pass']}" : '') .
                        (isset($parts['user']) ? '@' : '') .
                        (isset($parts['host']) ? (string)($parts['host']) : '') .
                        (isset($parts['port']) ? ":{$parts['port']}" : '') .
                        (isset($parts['path']) ? (string)($parts['path']) : '') .
                        (isset($parts['query']) ? "?{$parts['query']}" : '') .
                        (isset($parts['fragment']) ? "#{$parts['fragment']}" : '');
                }, $url_data
            );

            $this->webpage->image          = new Image();
            $this->webpage->image->id      = $this->webpage->url . '#primaryimage';
            $this->webpage->image->caption = $this->webpage->title;
            $this->webpage->image->url     = $url;
            $this->webpage->image->width   = $image->get('width');
            $this->webpage->image->height  = $image->get('height');
            $this->webpage->image->type    = $image->get('mime');
        }
    }

    /**
     * @param PageObject $page
     */
    protected function setAuthor($page): void
    {
        if (!$this->grav['config']->get('plugins.aura-authors.enabled') || !isset($page->header()->aura['author'])) {
            return;
        }

        $authors = $this->grav['config']->get('plugins.aura-authors.authors');
        $key     = array_search($page->header()->aura['author'], array_column($authors, 'label'));

        if ($key !== false) {
            $author = $authors[$key];

            $this->person              = new Person();
            $this->person->id          = $this->org->url . '#person/' . $author['label'];
            $this->person->name        = $author['name'];
            $this->person->description = $author['description'];

            // Person SameAs
            $sameAs = [];

            foreach ($this->otherPresence as $platform) {
                $key = 'person-' . $platform;

                if (isset($author[$key]) && $author[$key] != '') {
                    $sameAs[] = $author[$key];
                }
            }

            $key = 'person-twitter-user';

            if (isset($author[$key]) && $author[$key] != '') {
                $this->person->twitterUser = $author[$key];
                $sameAs[]                  = 'https://twitter.com/' . $author[$key];
            }

            if (!empty($sameAs)) {
                $this->person->sameAs = $sameAs;
            }

            // Person Image
            if (isset($author['image']) && !empty($author['image'])) {
                $firstImage = reset($author['image']);
                $imagePath  = ROOT_DIR . $firstImage['path'];

                if (file_exists($imagePath)) {
                    $size                         = getimagesize($imagePath);
                    $this->person->image          = new Image();
                    $this->person->image->url     = $this->grav['base_url_absolute'] . '/' . $firstImage['path'];
                    $this->person->image->id      = $this->org->url . '#personimage/' . $author['label'];
                    $this->person->image->width   = $size[0];
                    $this->person->image->height  = $size[1];
                    $this->person->image->caption = $author['name'];
                    $this->person->image->type    = $size['mime'];
                }
            }
        }
    }
}