
<?php 

class PostData {
    public static $default_banners = [];
    public static $markdown_engine = null;

    public $data;

    public $html_data;
    public $raw_data;

    public static function _generate_404($sql_row) {
        $sql_row ??= [
            'post_id' => -1,
            'post_path' => '/404.md',
            'post_title' => '404 Page',
            'post_metadata' => [
                'type' => '404'
            ]
        ];
    } 

    public static function _deduce_type($path) {
        $ext = pathinfo($path, PATHINFO_EXTENSION);

		if(preg_match("/\.(\w+)\.md$/", $path, $ext_match)) {
			$ext = $ext_match[1];
		}

		$ext_mapping = [
			'' => 'directory',
			'md' => 'text/markdown',
			'png' => 'image',
			'jpg' => 'image',
			'jpeg' => 'image'
		];

		return $ext_mapping[$ext] ?? '?';
    }

    public static function _deduce_icon($type) {
        $icon_mapping = [
			'' => 'question',
			'text/markdown' => 'markdown',
			'directory' => 'folder',
			'gallery' => 'images',
			'image' => 'image'
		];

        return $icon_mapping[$type] ?? 'unknown';
    }

    function __construct($post_handler, $sql_row) {
        $this->post_handler = $post_handler;
        
        $this->content_html = null;

        $sql_meta = null;
        if(!isset($sql_row) or !$sql_row['found']) {
            $sql_row = $this->_generate_404($sql_row);
            $sql_meta = $sql_row['post_metadata'];
        }
        

        $sql_meta = $sql_row['post_metadata'];
        if(is_string($sql_meta)) {
            $sql_meta = json_decode($sql_meta, true);
        }
        
        unset($sql_meta['settings']);

        $this->sql_row = $sql_row;
        $this->sql_meta = $sql_meta ?? [];
        $sql_settings = json_decode($sql_row['post_settings_cache'], true) ?? [];

        $data = [
            'id' => $sql_row['post_id'],
            'path' => $sql_row['post_path'],
            'url' => 'https://' . $sql_row['host'] . $sql_row['post_path'],            
            'created_at' => $sql_row['post_create_time'] ?? '',
            'updated_at' => $sql_row['post_update_time'] ?? '',
            'view_count' => $sql_row['post_access_count'] ?? 0
        ];
        
        $data['title'] = $sql_meta['title'] ?? $sql_row['title'];
        unset($sql_meta['title']);

        $data['tags'] = $sql_meta['tags'] ?? [];
        unset($sql_meta['tags']);

        $data['type'] = $sql_meta['type']
                    ?? self::_deduce_type($sql_row['post_path']);
        unset($sql_meta['type']);

        $data['icon'] = $sql_meta['icon']
                    ?? self::_deduce_icon($data['type']);
        unset($sql_meta['icon']);

        if(isset($sql_meta['media_url'])) {
            $data['media_url'] = $sql_meta['media_url'];
            $data['thumb_url'] = $sql_meta['thumb_url'] ?? $data['media_url'];

            unset($sql_meta['media_url']);
            unset($sql_meta['thumb_url']);
        }

        $data['banners'] = $sql_meta['banners'] 
                        ?? $sql_settings['banners']
                        ?? self::$default_banners;

        unset($sql_meta['banners']);
        unset($sql_settings['banners']);

        $data['preview_image'] = $sql_meta['preview_image'] ?? $data['banners'][0]['src'] ?? null;
        unset($sql_meta['preview_image']);

        $data['brief'] = $sql_meta['brief']
                       ?? $data['title'];
        unset($sql_meta['brief']);

        $data['excerpt'] = $sql_meta['excerpt'] 
                        ?? substr($sql_row['post_content'], 0, 256);

        $data['metadata'] = $sql_meta;
        $data['settings'] = $sql_settings;

        $this->data = $data;
    }

    public function __get($name) {
        if($name == 'html') {
            return $this->get_html();
        }
        if($name == 'markdown') {
            return $this->sql_row['post_content'];
        }
        if($name == 'json') {
            return $this->to_json();
        }
        
        return $this->data[$name];
    }

    public function get_html() {
        $fn = self::$markdown_engine;
        $this->content_html ??= $fn($this);

        return $this->content_html;
    }

    public function to_json($with_markdown = false, $with_html = false) {
        $out_data = $this->data;

        if($with_markdown) {
            $out_data['markdown'] = $this->sql_row['post_content'];
        }
        if($with_html) {
            $out_data['html'] = $this->get_html();
        }

        return json_encode($out_data);
    }
}

?>