<?php namespace BookStack;


class Entity extends Ownable
{

    /**
     * Compares this entity to another given entity.
     * Matches by comparing class and id.
     * @param $entity
     * @return bool
     */
    public function matches($entity)
    {
        return [get_class($this), $this->id] === [get_class($entity), $entity->id];
    }

    /**
     * Checks if an entity matches or contains another given entity.
     * @param Entity $entity
     * @return bool
     */
    public function matchesOrContains(Entity $entity)
    {
        $matches = [get_class($this), $this->id] === [get_class($entity), $entity->id];

        if ($matches) return true;

        if (($entity->isA('chapter') || $entity->isA('page')) && $this->isA('book')) {
            return $entity->book_id === $this->id;
        }

        if ($entity->isA('page') && $this->isA('chapter')) {
            return $entity->chapter_id === $this->id;
        }

        return false;
    }

    /**
     * Gets the activity objects for this entity.
     * @return \Illuminate\Database\Eloquent\Relations\MorphMany
     */
    public function activity()
    {
        return $this->morphMany(Activity::class, 'entity')->orderBy('created_at', 'desc');
    }

    /**
     * Get View objects for this entity.
     */
    public function views()
    {
        return $this->morphMany(View::class, 'viewable');
    }

    /**
     * Get the Tag models that have been user assigned to this entity.
     * @return \Illuminate\Database\Eloquent\Relations\MorphMany
     */
    public function tags()
    {
        return $this->morphMany(Tag::class, 'entity')->orderBy('order', 'asc');
    }

    /**
     * Get this entities restrictions.
     */
    public function permissions()
    {
        return $this->morphMany(EntityPermission::class, 'restrictable');
    }

    /**
     * Check if this entity has a specific restriction set against it.
     * @param $role_id
     * @param $action
     * @return bool
     */
    public function hasRestriction($role_id, $action)
    {
        return $this->permissions()->where('role_id', '=', $role_id)
            ->where('action', '=', $action)->count() > 0;
    }

    /**
     * Check if this entity has live (active) restrictions in place.
     * @param $role_id
     * @param $action
     * @return bool
     */
    public function hasActiveRestriction($role_id, $action)
    {
        return $this->getRawAttribute('restricted') && $this->hasRestriction($role_id, $action);
    }

    /**
     * Get the entity jointPermissions this is connected to.
     * @return \Illuminate\Database\Eloquent\Relations\MorphMany
     */
    public function jointPermissions()
    {
        return $this->morphMany(JointPermission::class, 'entity');
    }

    /**
     * Allows checking of the exact class, Used to check entity type.
     * Cleaner method for is_a.
     * @param $type
     * @return bool
     */
    public static function isA($type)
    {
        return static::getType() === strtolower($type);
    }

    /**
     * Get entity type.
     * @return mixed
     */
    public static function getType()
    {
        return strtolower(static::getClassName());
    }

    /**
     * Get an instance of an entity of the given type.
     * @param $type
     * @return Entity
     */
    public static function getEntityInstance($type)
    {
        $types = ['Page', 'Book', 'Chapter'];
        $className = str_replace([' ', '-', '_'], '', ucwords($type));
        if (!in_array($className, $types)) {
            return null;
        }

        return app('BookStack\\' . $className);
    }

    /**
     * Gets a limited-length version of the entities name.
     * @param int $length
     * @return string
     */
    public function getShortName($length = 25)
    {
        if (strlen($this->name) <= $length) return $this->name;
        return substr($this->name, 0, $length - 3) . '...';
    }

    /**
     * Perform a full-text search on this entity.
     * @param string[] $fieldsToSearch
     * @param string[] $terms
     * @param string[] array $wheres
     * @return mixed
     */
    public function fullTextSearchQuery($fieldsToSearch, $terms, $wheres = [])
    {
        $exactTerms = [];
        if (count($terms) === 0) {
            $search = $this;
            $orderBy = 'updated_at';
        } else {
            foreach ($terms as $key => $term) {
                $term = htmlentities($term, ENT_QUOTES);
                $term = preg_replace('/[+\-><\(\)~*\"@]+/', ' ', $term);
                if (preg_match('/\s/', $term)) {
                    $exactTerms[] = '%' . $term . '%';
                    $term = '"' . $term . '"';
                } else {
                    $term = '' . $term . '*';
                }
                if ($term !== '*') $terms[$key] = $term;
            }
            $termString = implode(' ', $terms);
            $fields = implode(',', $fieldsToSearch);
            $search = static::selectRaw('*, MATCH(name) AGAINST(? IN BOOLEAN MODE) AS title_relevance', [$termString]);
            $search = $search->whereRaw('MATCH(' . $fields . ') AGAINST(? IN BOOLEAN MODE)', [$termString]);

            // Ensure at least one exact term matches if in search
            if (count($exactTerms) > 0) {
                $search = $search->where(function ($query) use ($exactTerms, $fieldsToSearch) {
                    foreach ($exactTerms as $exactTerm) {
                        foreach ($fieldsToSearch as $field) {
                            $query->orWhere($field, 'like', $exactTerm);
                        }
                    }
                });
            }
            $orderBy = 'title_relevance';
        };

        // Add additional where terms
        foreach ($wheres as $whereTerm) {
            $search->where($whereTerm[0], $whereTerm[1], $whereTerm[2]);
        }
        // Load in relations
        if ($this->isA('page')) {
            $search = $search->with('book', 'chapter', 'createdBy', 'updatedBy');
        } else if ($this->isA('chapter')) {
            $search = $search->with('book');
        }

        return $search->orderBy($orderBy, 'desc');
    }
    
}
