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<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Installer
 */
class WebInstallerExistingWiki extends WebInstallerPage {
    /**
     * @return string
     */
    public function execute() {
        // If there is no LocalSettings.php, continue to the installer welcome page
        $vars = Installer::getExistingLocalSettings();
        if ( !$vars ) {
            return 'skip';
        }
        // Check if the upgrade key supplied to the user has appeared in LocalSettings.php
        if ( $vars['wgUpgradeKey'] !== false
            && $this->getVar( '_UpgradeKeySupplied' )
            && $this->getVar( 'wgUpgradeKey' ) === $vars['wgUpgradeKey']
        ) {
            // It's there, so the user is authorized
            $status = $this->handleExistingUpgrade( $vars );
            if ( $status->isOK() ) {
                return 'skip';
            } else {
                $this->startForm();
                $this->parent->showStatusBox( $status );
                $this->endForm( 'continue' );
                return 'output';
            }
        }
        // If there is no $wgUpgradeKey, tell the user to add one to LocalSettings.php
        if ( $vars['wgUpgradeKey'] === false ) {
            if ( $this->getVar( 'wgUpgradeKey', false ) === false ) {
                $secretKey = $this->getVar( 'wgSecretKey' ); // preserve $wgSecretKey
                $this->parent->generateKeys();
                $this->setVar( 'wgSecretKey', $secretKey );
                $this->setVar( '_UpgradeKeySupplied', true );
            }
            $this->startForm();
            $this->addHTML( $this->parent->getInfoBox(
                wfMessage( 'config-upgrade-key-missing', "<pre dir=\"ltr\">\$wgUpgradeKey = '" .
                    $this->getVar( 'wgUpgradeKey' ) . "';</pre>" )->plain()
            ) );
            $this->endForm( 'continue' );
            return 'output';
        }
        // If there is an upgrade key, but it wasn't supplied, prompt the user to enter it
        $r = $this->parent->request;
        if ( $r->wasPosted() ) {
            $key = $r->getText( 'config_wgUpgradeKey' );
            if ( !$key || $key !== $vars['wgUpgradeKey'] ) {
                $this->parent->showError( 'config-localsettings-badkey' );
                $this->showKeyForm();
                return 'output';
            }
            // Key was OK
            $status = $this->handleExistingUpgrade( $vars );
            if ( $status->isOK() ) {
                return 'continue';
            } else {
                $this->parent->showStatusBox( $status );
                $this->showKeyForm();
                return 'output';
            }
        } else {
            $this->showKeyForm();
            return 'output';
        }
    }
    /**
     * Show the "enter key" form
     */
    protected function showKeyForm() {
        $this->startForm();
        $this->addHTML(
            $this->parent->getInfoBox( wfMessage( 'config-localsettings-upgrade' )->plain() ) .
            '<br />' .
            $this->parent->getTextBox( [
                'var' => 'wgUpgradeKey',
                'label' => 'config-localsettings-key',
                'attribs' => [ 'autocomplete' => 'off' ],
            ] )
        );
        $this->endForm( 'continue' );
    }
    /**
     * @param string[] $names
     * @param mixed[] $vars
     *
     * @return Status
     */
    protected function importVariables( $names, $vars ) {
        $status = Status::newGood();
        foreach ( $names as $name ) {
            if ( !isset( $vars[$name] ) ) {
                $status->fatal( 'config-localsettings-incomplete', $name );
            }
            $this->setVar( $name, $vars[$name] );
        }
        return $status;
    }
    /**
     * Initiate an upgrade of the existing database
     *
     * @param mixed[] $vars Variables from LocalSettings.php
     *
     * @return Status
     */
    protected function handleExistingUpgrade( $vars ) {
        // Check $wgDBtype
        if ( !isset( $vars['wgDBtype'] ) ||
            !in_array( $vars['wgDBtype'], Installer::getDBTypes() )
        ) {
            return Status::newFatal( 'config-localsettings-connection-error', '' );
        }
        // Set the relevant variables from LocalSettings.php
        $requiredVars = [ 'wgDBtype' ];
        $status = $this->importVariables( $requiredVars, $vars );
        $installer = $this->parent->getDBInstaller();
        $status->merge( $this->importVariables( $installer->getGlobalNames(), $vars ) );
        if ( !$status->isOK() ) {
            return $status;
        }
        $this->setVar( '_InstallUser', $vars['wgDBadminuser'] ?? $vars['wgDBuser'] );
        $this->setVar( '_InstallPassword', $vars['wgDBadminpassword'] ?? $vars['wgDBpassword'] );
        // Test the database connection
        $status = $installer->getConnection();
        if ( !$status->isOK() ) {
            // Adjust the error message to explain things correctly
            $status->replaceMessage( 'config-connection-error',
                'config-localsettings-connection-error' );
            return $status;
        }
        // All good
        $this->setVar( '_ExistingDBSettings', true );
        // Copy $wgAuthenticationTokenVersion too, if it exists
        $this->setVar( 'wgAuthenticationTokenVersion',
            $vars['wgAuthenticationTokenVersion'] ?? null
        );
        return $status;
    }
}