<?php

namespace bff\modules\seo\social;

use bff;
use Url;
use SEO;
use HTML;
use Lang;
use config;
use bff\tpl\admin\Form;
use bff\modules\seo\Template;

/**
 * Facebook (Open Graph)
 * @see https://developers.facebook.com/docs/sharing/webmasters#markup
 * @see https://ogp.me/
 * @copyright Tamaranga
 */
class Facebook implements Provider
{
    /** @var array meta cache */
    protected $meta = [];

    /**
     * Provider unique key
     * @return string
     */
    public function providerKey(): string
    {
        return 'fb';
    }

    /**
     * Provider title
     * @return string
     */
    public function providerTitle(): string
    {
        return 'Facebook (Open Graph)';
    }

    /**
     * Page settings form
     * @param Form $form
     * @param bool $static form
     * @param bool $general
     * @param array $opts
     */
    public function form($form, $static = false, $general = false, array $opts = [])
    {
        $form->text('og_title', _t('@seo', 'Title'));
        $form->textarea('og_description', _t('@seo', 'Description'));
        //$form->text('og_video_url', _t('@seo', 'Video URL'));
        if (! $static) {
            $form->select('og_image', _t('@seo', 'Images'), false, $this->imageOptions());
            foreach (
                [
                'og_image_uploaded' => ['title' => _t('@seo', 'Uploaded Images'), 'visible-if' => 'uploaded'],
                'og_image_default' => ['title' => _t('@seo', 'Default Images'), 'hidden-if' => 'uploaded'],
                ] as $fieldName => $fieldSettings
            ) {
                $form->images($fieldName, $fieldSettings['title'], 5, 10 /* 10Mb */, [], [
                    'folderByID' => $opts['images_folderbyid'] ?? false,
                ])
                    ->tip(_t('@seo', 'Minimum size: 200px x 200px, ideal ratio 1.91:1, 8MB max. (eg. 1640px x 856px or 3280px x 1712px for retina screens)'))
                    ->setFolder(rtrim($opts['images_dir'] ?? bff::publicPath('files/images/settings'), '\/') . DS);
                if (isset($fieldSettings['visible-if'])) {
                    $form->visibleIf('og_image', $fieldSettings['visible-if']);
                }
                if (isset($fieldSettings['hidden-if'])) {
                    $form->hiddenIf('og_image', $fieldSettings['hidden-if']);
                }
            }
        }
        $form->select('og_type', _t('@seo', 'Type'), false, $this->typeOptions());
    }

    /**
     * General settings form
     * @param Form $form
     */
    public function settings($form)
    {
        $form->staticText('', $this->providerTitle());
        $form->text('og_sitename', _t('@seo', 'Site Name'), [], false);
        $form->text('fb_app_id', _t('@seo', 'Facebook App ID'), [], false);
    }

    /**
     * Get social page meta
     * @param Template $template seo template
     * @param array $page page data
     * @param string $lang language
     * @param bool|array $landing active landing page or false
     * @param array $opts [social_images_key, general_social_template_key]
     * @return array
     */
    public function getMeta(Template $template, array $page, string $lang, $landing, array $opts = []): array
    {
        if ($this->meta) {
            return $this->meta;
        }

        $seo = SEO::i();
        $general = !empty($page[$opts['general_social_template_key'] ?? 'msocialtemplate']);
        $data = $template->data[self::SOCIAL_KEY];
        $datatext = $template->data[self::SOCIALTEXT_KEY];

        # og:locale
        $locale = Lang::getLanguageSettings($lang, 'locale');
        if (! empty($locale)) {
            $this->setMeta('og:locale', $locale);
        }

        # url
        if ($template->canonical) {
            $canonicalUrl = $template->canonical->getMeta($lang, $landing)['link-canonical']['href'] ?? '';
            if (! empty($canonicalUrl)) {
                $this->setMeta('og:url', $canonicalUrl);
            }
        }

        # type
        $type = $page[self::SOCIAL_KEY]['og_type'] ?? $data['og_type'] ?? '';
        if (array_key_exists($type, $this->typeOptions())) {
            $this->setMeta('og:type', strval($type));
        }

        # title, description, video
        $placeholders = $template->params;
        foreach (
            [
            'og_title' => 'og:title',
            'og_description' => 'og:description',
            'og_video_url' => 'og:video',
            ] as $key => $property
        ) {
            $content = $page[self::SOCIALTEXT_KEY][$key] ?? '';
            if ($general) {
                $content = str_replace(
                    ($content !== '' ?
                        ['{meta-base}', ' {meta-base}'] :
                        [' {meta-base}', '{meta-base} ', '{meta-base}']),
                    $content,
                    $datatext[$key][$lang] ?? ''
                );
            }
            if (! empty($content)) {
                $content = $seo->metaTextPrepare($content, $placeholders);
                if (! empty($content)) {
                    $this->setMeta($property, $content);
                }
            }
        }

        # image
        $images = [];
        $imagesSource = $page[self::SOCIAL_KEY]['og_image'] ?? $data['og_image'] ?? 'content';
        if ($imagesSource === 'uploaded') {
            $uploadedImages = $page[self::SOCIAL_KEY]['og_image_uploaded'] ?? $data['og_image_uploaded'] ?? [];
            if (! empty($uploadedImages) && is_array($uploadedImages)) {
                foreach ($uploadedImages as $image) {
                    $images[] = [
                        'width' => $image['width'] ?? 0,
                        'height' => $image['height'] ?? 0,
                        'url' => Url::dynamic($image['url']['o'], [], ['lang' => Lang::getDefaultLanguage()]),
                    ];
                }
            }
        } else { # 'content' or empty
            $contentImages = $page[$opts['social_images_key'] ?? 'images'] ?? [];
            if (empty($contentImages)) { # no content images => use default images
                $defaultImages = $data['og_image_default'] ?? [];
                if (! empty($defaultImages) && is_array($defaultImages)) {
                    $contentImages = [];
                    foreach ($defaultImages as $image) {
                        $contentImages[] = [
                            'width' => $image['width'] ?? 0,
                            'height' => $image['height'] ?? 0,
                            'url' => Url::dynamic($image['url']['o'], [], ['lang' => Lang::getDefaultLanguage()]),
                        ];
                    }
                }
            }
            if (! empty($contentImages)) {
                if (is_string($contentImages)) {
                    $contentImages = [['social_url' => $contentImages]];
                }
                if (is_array($contentImages)) {
                    foreach ($contentImages as $image) {
                        if (isset($image['social_url']) || isset($image['url'])) {
                            $images[] = [
                                'width' => $image['width'] ?? 0,
                                'height' => $image['height'] ?? 0,
                                'url' => Url::dynamic($image['social_url'] ?? $image['url']),
                            ];
                        }
                    }
                }
            }
        }
        $i = 0;
        foreach ($images as $image) {
            if (! empty($image['url'])) {
                $this->setMeta('og:image', $image['url'], 'og:image:' . $i);
                if (! empty($image['width'])) {
                    $this->setMeta('og:image:width', $image['width'], 'og:image:width:' . $i);
                }
                if (! empty($image['height'])) {
                    $this->setMeta('og:image:height', $image['height'], 'og:image:height:' . $i);
                }
                if (! $i) {
                    $this->setMeta('twitter:image', $image['url'], 'twitter:image:' . $i, 'name');
                }
                $i++;
            }
        }

        # general:
        # og:site_name:
        $settings = config::get('seo.social', [], TYPE_ARRAY);
        if (! empty($settings['og_sitename'])) {
            $content = $seo->metaTextPrepare($settings['og_sitename'], $placeholders);
            if (! empty($content)) {
                $this->setMeta('og:site_name', $content);
            }
        }
        # fb:app_id
        if (! empty($settings['fb_app_id'])) {
            $this->setMeta('fb:app_id', $settings['fb_app_id']);
        }

        return $this->meta;
    }

    /**
     * Set open graph meta data
     * @param string $property
     * @param string|array $content
     * @param string|null $key
     * @param string $propertyKey
     */
    protected function setMeta(string $property, $content, $key = null, $propertyKey = 'property')
    {
        $tag = [
            $propertyKey => $property,
            'content' => $content,
        ];
        $this->meta[$key ?? $property] = array_merge($tag, [
            'tag' => 'meta',
            'html' => '<meta' . HTML::attributes($tag) . ' />',
        ]);
    }

    /**
     * Image options
     * @return array
     */
    public function imageOptions(): array
    {
        return [
            [
                'id' => 'content',
                'title' => _t('@seo', 'Content Images'),
            ],
            [
                'id' => 'uploaded',
                'title' => _t('@seo', 'Uploaded Images'),
            ],
        ];
    }

    /**
     * Type options
     * @see https://ogp.me/#no_vertical
     * @return array
     */
    public function typeOptions()
    {
        $list = [
            'article' => [
                'title' => _t('@seo', 'Article'),
            ],
            'book' => [
                'title' => _t('@seo', 'Book'),
            ],
            'profile' => [
                'title' => _t('@seo', 'Profile'),
            ],
            'website' => [
                'title' => _t('@seo', 'Website'),
            ],
            'music.song' => [
                'title' => _t('@seo', 'Music: Song'),
            ],
            'music.album' => [
                'title' => _t('@seo', 'Music: Album'),
            ],
            'music.playlist' => [
                'title' => _t('@seo', 'Music: Playlist'),
            ],
            'music.radio_station' => [
                'title' => _t('@seo', 'Music: Radio Station'),
            ],
            'video.movie' => [
                'title' => _t('@seo', 'Video: Movie'),
            ],
            'video.episode' => [
                'title' => _t('@seo', 'Video: Episode'),
            ],
            'video.tv_show' => [
                'title' => _t('@seo', 'Video: TV Show'),
            ],
            'video.other' => [
                'title' => _t('@seo', 'Video: Other'),
            ],
        ];

        foreach ($list as $key => &$value) {
            $value['id'] = $key;
        }

        return $list;
    }
}