<?php

namespace wcf\system\comment\manager;

use wcf\data\comment\Comment;
use wcf\data\comment\response\CommentResponse;
use wcf\data\DatabaseObjectDecorator;
use wcf\system\bbcode\BBCodeHandler;
use wcf\system\SingletonFactory;
use wcf\system\WCF;

/**
 * Default implementation for comment managers.
 *
 * @author  Alexander Ebert
 * @copyright   2001-2019 WoltLab GmbH
 * @license GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 * @package WoltLabSuite\Core\System\Comment\Manager
 */
abstract class AbstractCommentManager extends SingletonFactory implements ICommentManager
{
    /**
     * display comments per page
     * @var int
     */
    public $commentsPerPage = 30;

    /**
     * permission name for comment/response creation
     * @var string
     */
    protected $permissionAdd = '';

    /**
     * permission name for comment/response creation without approval
     * @var string
     */
    protected $permissionAddWithoutModeration = '';

    /**
     * permission name for comment/response moderation
     * @var string
     */
    protected $permissionCanModerate = '';

    /**
     * permission name for deletion of own comments/responses
     * @var string
     */
    protected $permissionDelete = '';

    /**
     * permission name for editing of own comments/responses
     * @var string
     */
    protected $permissionEdit = '';

    /**
     * permission name for deletion of comments/responses (moderator)
     * @var string
     */
    protected $permissionModDelete = '';

    /**
     * permission name for editing of comments/responses (moderator)
     * @var string
     */
    protected $permissionModEdit = '';

    /**
     * permission name for the list of disallowed bbcodes
     * @var string
     */
    protected $permissionDisallowedBBCodes = 'user.comment.disallowedBBCodes';

    /**
     * @inheritDoc
     */
    public function canAdd($objectID)
    {
        if (VISITOR_USE_TINY_BUILD && !WCF::getUser()->userID) {
            return false;
        }

        if (!$this->isAccessible($objectID, true)) {
            return false;
        }

        return WCF::getSession()->getPermission($this->permissionAdd) ? true : false;
    }

    /**
     * @inheritDoc
     */
    public function canAddWithoutApproval($objectID)
    {
        if (VISITOR_USE_TINY_BUILD && !WCF::getUser()->userID) {
            return false;
        }

        if (empty($this->permissionAddWithoutModeration)) {
            if (ENABLE_DEBUG_MODE) {
                throw new \RuntimeException("Missing permission name to create comments without approval.");
            }

            // backwards-compatibility in production mode
            return true;
        }

        return WCF::getSession()->getPermission($this->permissionAddWithoutModeration) ? true : false;
    }

    /**
     * @inheritDoc
     */
    public function setDisallowedBBCodes()
    {
        BBCodeHandler::getInstance()->setDisallowedBBCodes(\explode(
            ',',
            WCF::getSession()->getPermission($this->permissionDisallowedBBCodes)
        ));
    }

    /**
     * @inheritDoc
     */
    public function canEditComment(Comment $comment)
    {
        return $this->canEdit($comment->userID == WCF::getUser()->userID);
    }

    /**
     * @inheritDoc
     */
    public function canEditResponse(CommentResponse $response)
    {
        return $this->canEdit($response->userID == WCF::getUser()->userID);
    }

    /**
     * @inheritDoc
     */
    public function canDeleteComment(Comment $comment)
    {
        return $this->canDelete($comment->userID == WCF::getUser()->userID);
    }

    /**
     * @inheritDoc
     */
    public function canDeleteResponse(CommentResponse $response)
    {
        return $this->canDelete($response->userID == WCF::getUser()->userID);
    }

    /**
     * @inheritDoc
     */
    public function canModerate($objectTypeID, $objectID)
    {
        return WCF::getSession()->getPermission($this->permissionCanModerate) ? true : false;
    }

    /**
     * Returns true if the current user may edit a comment/response.
     *
     * @param bool $isOwner
     * @return  bool
     */
    protected function canEdit($isOwner)
    {
        // disallow guests
        if (!WCF::getUser()->userID) {
            return false;
        }

        // check moderator permission
        if (WCF::getSession()->getPermission($this->permissionModEdit)) {
            return true;
        }

        // check user permission and ownership
        if ($isOwner && WCF::getSession()->getPermission($this->permissionEdit)) {
            return true;
        }

        return false;
    }

    /**
     * Returns true if the current user may delete a comment/response.
     *
     * @param bool $isOwner
     * @return  bool
     */
    protected function canDelete($isOwner)
    {
        // disallow guests
        if (!WCF::getUser()->userID) {
            return false;
        }

        // check moderator permission
        if (WCF::getSession()->getPermission($this->permissionModDelete)) {
            return true;
        }

        // check user permission and ownership
        if ($isOwner && WCF::getSession()->getPermission($this->permissionDelete)) {
            return true;
        }

        return false;
    }

    /**
     * @inheritDoc
     */
    public function getCommentsPerPage()
    {
        return $this->commentsPerPage;
    }

    /**
     * @inheritDoc
     */
    public function supportsLike()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function supportsReport()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function getCommentLink(Comment $comment)
    {
        return $this->getLink($comment->objectTypeID, $comment->objectID) . '#comment' . $comment->commentID;
    }

    /**
     * @inheritDoc
     */
    public function getResponseLink(CommentResponse $response)
    {
        return $this->getLink($response->getComment()->objectTypeID, $response->getComment()->objectID)
            . '#comment' . $response->commentID . '/response' . $response->responseID;
    }

    /**
     * @inheritDoc
     */
    public function isContentAuthor($commentOrResponse)
    {
        return false;
    }

    /**
     * Returns the object ID for the given Comment or CommentResponse.
     *
     * @return int
     */
    final protected function getObjectID($commentOrResponse)
    {
        if (
            $commentOrResponse instanceof CommentResponse
            || (
                $commentOrResponse instanceof DatabaseObjectDecorator
                && $commentOrResponse->getDecoratedObject() instanceof CommentResponse
            )
        ) {
            return $commentOrResponse->getComment()->objectID;
        } else {
            return $commentOrResponse->objectID;
        }
    }
}