<?php

abstract class Brizy_Editor_Entity extends Brizy_Admin_Serializable
{

    const BRIZY_DATA_VERSION_KEY = 'brizy_data_version';

    /**
     * @var string
     */
    protected $uid;

    /**
     * @var int
     */
    protected $wp_post_id;

    /**
     * @var WP_Post
     */
    protected $wp_post = null;

    /**
     * @var int
     */
    protected $dataVersion = null;

    /**
     * Brizy_Editor_Entity constructor.
     */
    public function __construct($postId)
    {
        if ( ! is_numeric($postId)) {
            throw new Exception('Invalid post id provided');
        }

        Brizy_Editor::checkIfPostTypeIsSupported($postId);

        $this->setWpPostId($postId);

        $this->loadInstanceData();
    }

    static public function get($postId)
    {
        $type = get_post_type($postId);

        switch ($type) {
            case 'page':
            case 'post':
            case Brizy_Admin_Popups_Main::CP_POPUP:
                return Brizy_Editor_Post::get($postId);

            case Brizy_Admin_Blocks_Main::CP_GLOBAL:
            case Brizy_Admin_Blocks_Main::CP_SAVED:
                return Brizy_Editor_Block::get($postId);
        }
    }

    /**
     * @param $postId
     *
     * @return Brizy_Editor_Block|Brizy_Editor_Post|mixed
     * @throws Exception
     */
    public function duplicateTo($postId)
    {
        // check post types
        if (get_post_type($postId) !== $this->getWpPost()->post_type) {
            throw new Exception('Cannot duplicate post. Invalid target post type');
        }

        if ( ! $this->uses_editor()) {
            throw new Exception('The source post is not using Brizy.');
        }

        // copy current date the the new post
        $newPost = self::get($postId);

        if ($newPost->uses_editor()) {
            throw new Exception('Target post is using Brizy.');
        }

        $newPost->set_needs_compile(true);
        $newPost->set_uses_editor(true);
        $newPost->setDataVersion(1);
        $newPost->createUid();

        return $newPost;
    }


    /**
     * Will return the key on witch the object data will be saved in storage
     *
     * @return mixed
     */
    abstract protected function getObjectKey();

    /**
     * Load all object data
     */
    abstract protected function loadInstanceData();

    /**
     * @return mixed
     */
    abstract public function createResponse($fields = array());

    /**
     * Save post data and and trigger post update
     *
     * @return mixed
     */
    abstract public function savePost();

    /**
     * This will save ro create an autosave object the the data from entity
     * Also before saving the data version will be checked
     *
     * @return $this
     * @throws Exception
     */
    public function save($autosave = 0)
    {

        // check entity versions before saving.
        if ((int)$autosave === 0) {
            $this->saveDataVersion();
        }

        $this->createUid();

        return $this;
    }

    /**
     * This will take all values from entity and save them to database
     */
    public function saveStorage()
    {
        $value = $this->convertToOptionValue();
        $this->getStorage()->set($this->getObjectKey(), $value);
    }


    /**
     * @return Brizy_Editor_Post[]
     * @throws Brizy_Editor_Exceptions_NotFound
     * @throws Brizy_Editor_Exceptions_UnsupportedPostType
     */
    public static function get_all_brizy_post_ids()
    {
        global $wpdb;
        $posts = $wpdb->get_results(
            $wpdb->prepare(
                "SELECT p.ID FROM {$wpdb->postmeta} pm 
									JOIN {$wpdb->posts} p ON p.ID=pm.post_id and p.post_type <> 'revision'  and p.post_type<>'attachment' and p.post_status='publish'
									WHERE pm.meta_key = %s ",
                Brizy_Editor_Storage_Post::META_KEY
            )
        );

        return array_map(
            function ($o) {
                return (int)$o->ID;
            },
            $posts
        );
    }

    /**
     * @return int
     */
    public function getWpPostId()
    {
        return $this->wp_post_id;
    }

    /**
     * @param int $wp_post_id
     *
     * @return Brizy_Editor_Entity
     */
    public function setWpPostId($wp_post_id)
    {
        $this->wp_post_id = $wp_post_id;

        return $this;
    }

    /**
     * Return the post parent id
     *
     * @return int
     */
    public function getWpPostParentId()
    {
        return $this->getWpPost()->post_parent ?: $this->getWpPostId();
    }

    /**
     * @return WP_Post
     */
    public function getWpPost()
    {
        return $this->wp_post ?: ($this->wp_post = get_post($this->getWpPostId()));
    }

    /**
     * @return $this
     */
    protected function saveDataVersion()
    {
        $version = $this->getCurrentDataVersion();

        if ($this->dataVersion !== $version + 1) {
            Brizy_Logger::instance()->critical(
                'Unable to save entity. The data version is wrong.',
                [
                    'post_id' => $this->getWpPostId(),
				'currentVersion' => $version,
                    'newVersion'     => $this->dataVersion,
                ]
            );
            throw new Brizy_Editor_Exceptions_DataVersionMismatch('Unable to save entity. The data version is wrong.');
        }

        update_post_meta($this->getWpPostId(), self::BRIZY_DATA_VERSION_KEY, $this->dataVersion);

        return $this;
    }

    /**
     * @return int
     */
    public function getCurrentDataVersion()
    {
        return (int)(get_post_meta($this->getWpPostId(), self::BRIZY_DATA_VERSION_KEY, true) ?: 0);
    }


    /**
     * @param $dataVersion
     *
     * @return $this
     */
    public function setDataVersion($dataVersion)
    {
        $this->dataVersion = (int)$dataVersion;

        return $this;
    }

    /**
     * @return string
     */
    public function getUid()
    {
        return $this->uid;
    }

    /**
     * Return an instance of Brizy_Editor_Storage_Abstract that will store the object data
     *
     * @return Brizy_Editor_Storage_Post
     */
    protected function getStorage()
    {
        return Brizy_Editor_Storage_Post::instance($this->wp_post_id);
    }

    /**
     * @return mixed|string
     */
    protected function createUid()
    {
        $WPPost  = $this->getWpPost();
        $post_id = $WPPost->post_type != 'revision'?$this->getWpPostId():$WPPost->post_parent;

        if ($uid = $this->getUid()) {
            $uid = get_post_meta($post_id, 'brizy_post_uid', true);
            if ( ! $uid) {
                update_post_meta($post_id, 'brizy_post_uid', $this->getUid());
            }

            return $uid;
        }

        $uid = get_post_meta($post_id, 'brizy_post_uid', true);

        if ( ! $uid) {
            $uid = md5($post_id.time());
            update_post_meta($post_id, 'brizy_post_uid', $uid);
        }

        return $this->uid = $uid;
    }
}