<?php
defined('ABSPATH') || defined('DUPXABSPATH') || exit;

class DUPX_DBInstall
{
    const USER_DEFINER_PATTERN         = "/^(\s*(?:\/\*!\d+\s)?\s*(?:CREATE.+)?DEFINER\s*=)(\S+)(.*)$/m";
    const SQL_SECURITY_INVOKER_PATTERN = "/^([\s\t]*CREATE.+PROCEDURE[\s\S]*)(BEGIN)([\s\S]*)$/";
    const SQL_SECURITY_INVOKER_REPLACE = "$1SQL SECURITY INVOKER\n$2$3";
    const QUERY_ERROR_LOG_LEN          = 200;

    private $dbh;
    private $post;
    public $sql_result_data;
    public $sql_result_data_length;
    public $dbvar_maxtime;
    public $dbvar_maxpacks;
    public $dbvar_sqlmode;
    public $dbvar_version;
    public $pos_in_sql;
    public $sql_file_path;
    public $sql_result_file_path;
    public $php_mem;
    public $php_mem_range;
    public $php_used_mem;
    public $table_count;
    public $table_rows;
    public $query_errs;
    public $root_path;
    public $drop_tbl_log;
    public $rename_tbl_log;
    public $dbquery_errs;
    public $dbquery_rows;
    public $dbtable_count;
    public $dbtable_rows;
    public $dbdelete_count;
    public $profile_start;
    public $profile_end;
    public $start_microtime;
    public $dbcollatefb;
    public $dbobj_views;
    public $dbobj_procs;
	public $dbFileSize = 0;
	public $dbDefinerReplace;

    public function __construct($post, $start_microtime)
    {
        $this->post                 = $post;
        $this->php_mem              = $GLOBALS['PHP_MEMORY_LIMIT'];
        $this->php_used_mem         = memory_get_usage();
        $this->php_mem_range        = 1024 * 1024;
        $this->root_path            = $GLOBALS['DUPX_ROOT'];
        $this->sql_file_path        = "{$GLOBALS['DUPX_INIT']}/dup-database__{$GLOBALS['DUPX_AC']->package_hash}.sql";
        $this->sql_result_file_path = "{$GLOBALS['DUPX_INIT']}/{$GLOBALS['SQL_FILE_NAME']}";
		$this->dbFileSize			= @filesize($this->sql_file_path);

        //ESTABLISH CONNECTION
        $this->dbh = DUPX_DB::connect($post['dbhost'], $post['dbuser'], $post['dbpass']);
        ($this->dbh) or DUPX_Log::error(ERR_DBCONNECT.mysqli_connect_error());
        if ($_POST['dbaction'] == 'empty' || $post['dbaction'] == 'rename') {
            mysqli_select_db($this->dbh, $post['dbname'])
                or DUPX_Log::error(sprintf(ERR_DBCREATE, $post['dbname']));
        }

        @mysqli_query($this->dbh, "SET wait_timeout = ".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_MAX_TIME']));
        @mysqli_query($this->dbh, "SET GLOBAL max_allowed_packet = ".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_MAX_PACKETS']));
        @mysqli_query($this->dbh, "SET max_allowed_packet = ".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_MAX_PACKETS']));

        $this->profile_start    = isset($post['profile_start']) ? DUPX_U::sanitize_text_field($post['profile_start']) : DUPX_U::getMicrotime();
        $this->start_microtime  = isset($post['start_microtime']) ? DUPX_U::sanitize_text_field($post['start_microtime']) : $start_microtime;
        $this->dbvar_maxtime    = DUPX_DB::getVariable($this->dbh, 'wait_timeout');
        $this->dbvar_maxpacks   = DUPX_DB::getVariable($this->dbh, 'max_allowed_packet');
        $this->dbvar_sqlmode    = DUPX_DB::getVariable($this->dbh, 'sql_mode');
        $this->dbvar_version    = DUPX_DB::getVersion($this->dbh);
        $this->dbvar_maxtime    = is_null($this->dbvar_maxtime) ? 300 : $this->dbvar_maxtime;
        $this->dbvar_maxpacks   = is_null($this->dbvar_maxpacks) ? 1048576 : $this->dbvar_maxpacks;
        $this->dbvar_sqlmode    = empty($this->dbvar_sqlmode) ? 'NOT_SET' : $this->dbvar_sqlmode;
        $this->dbDefinerReplace = '$1' . addcslashes("`" . $this->post["dbuser"] . "`@`" . $this->post["dbhost"] . "`", '\\$') . '$3';
        $this->dbquery_errs     = isset($post['dbquery_errs']) ? DUPX_U::sanitize_text_field($post['dbquery_errs']) : 0;
        $this->drop_tbl_log     = isset($post['drop_tbl_log']) ? DUPX_U::sanitize_text_field($post['drop_tbl_log']) : 0;
        $this->rename_tbl_log   = isset($post['rename_tbl_log']) ? DUPX_U::sanitize_text_field($post['rename_tbl_log']) : 0;
        $this->dbquery_rows     = isset($post['dbquery_rows']) ? DUPX_U::sanitize_text_field($post['dbquery_rows']) : 0;
        $this->dbdelete_count   = isset($post['dbdelete_count']) ? DUPX_U::sanitize_text_field($post['dbdelete_count']) : 0;
        $this->dbcollatefb      = isset($post['dbcollatefb']) ? DUPX_U::sanitize_text_field($post['dbcollatefb']) : 0;
        $this->dbobj_views      = isset($post['dbobj_views']) ? DUPX_U::sanitize_text_field($post['dbobj_views']) : 0;
        $this->dbobj_procs      = isset($post['dbobj_procs']) ? DUPX_U::sanitize_text_field($post['dbobj_procs']) : 0;
    }

    public function prepareDB()
    {
        //RUN DATABASE SCRIPT
        @mysqli_query($this->dbh, "SET wait_timeout = ".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_MAX_TIME']));
        @mysqli_query($this->dbh, "SET max_allowed_packet = ".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_MAX_PACKETS']));
        DUPX_DB::setCharset($this->dbh, $this->post['dbcharset'], $this->post['dbcollate']);

        //Will set mode to null only for this db handle session
        //sql_mode can cause db create issues on some systems
        switch ($this->post['dbmysqlmode']) {
            case 'DISABLE':
                @mysqli_query($this->dbh, "SET SESSION sql_mode = ''");
                break;
            case 'CUSTOM':
                $dbmysqlmode_opts = $this->post['dbmysqlmode_opts'];

                $qry_session_custom = @mysqli_query($this->dbh, "SET SESSION sql_mode = '".mysqli_real_escape_string($this->dbh, $dbmysqlmode_opts)."'");
                if ($qry_session_custom == false) {
                    $sql_error = mysqli_error($this->dbh);
                    $log       = "WARNING: A custom sql_mode setting issue has been detected:\n{$sql_error}.\n";
                    $log       .= "For more details visit: http://dev.mysql.com/doc/refman/5.7/en/sql-mode.html\n";
                }
                break;
        }


        //Set defaults incase the variable could not be read
        $this->drop_tbl_log   = 0;
        $this->rename_tbl_log = 0;
        $sql_file_size	= DUPX_U::readableByteSize(@filesize("{$GLOBALS['DUPX_INIT']}/dup-database__{$GLOBALS['DUPX_AC']->package_hash}.sql"));
        $collate_fb		= $this->dbcollatefb ? 'On' : 'Off';

        DUPX_Log::info("--------------------------------------");
        DUPX_Log::info('DATABASE-ENVIRONMENT');
        DUPX_Log::info("--------------------------------------");
        DUPX_Log::info("MYSQL VERSION:\tThis Server: {$this->dbvar_version} -- Build Server: {$GLOBALS['DUPX_AC']->version_db}");
        DUPX_Log::info("FILE SIZE:\tdup-database__{$GLOBALS['DUPX_AC']->package_hash}.sql ({$sql_file_size})");
        DUPX_Log::info("TIMEOUT:\t{$this->dbvar_maxtime}");
        DUPX_Log::info("MAXPACK:\t{$this->dbvar_maxpacks}");
        DUPX_Log::info("SQLMODE:\t{$this->dbvar_sqlmode}");
        DUPX_Log::info("NEW SQL FILE:\t[{$this->sql_result_file_path}]");
        DUPX_Log::info("COLLATE FB:\t{$collate_fb}");

        if (version_compare($this->dbvar_version, $GLOBALS['DUPX_AC']->version_db) < 0) {
            DUPX_Log::info("\nNOTICE: This servers version [{$this->dbvar_version}] is less than the build version [{$GLOBALS['DUPX_AC']->version_db}].  \n"
                ."If you find issues after testing your site please referr to this FAQ item.\n"
                ."https://snapcreek.com/duplicator/docs/faqs-tech/#faq-installer-260-q");
        }

        //CREATE DB
        switch ($this->post['dbaction']) {
            case "create":
                if ($this->post['view_mode'] == 'basic') {
                    mysqli_query($this->dbh, "CREATE DATABASE IF NOT EXISTS `".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."`");
                }
                mysqli_select_db($this->dbh, mysqli_real_escape_string($this->dbh, $this->post['dbname']))
                    or DUPX_Log::error(sprintf(ERR_DBCONNECT_CREATE, $this->post['dbname']));
                break;

            //DROP DB TABLES:  DROP TABLE statement does not support views
            case "empty":
                //Drop all tables, views and procs
                $this->dropTables();
                $this->dropViews();
                $this->dropProcs();
                break;

            //RENAME DB TABLES
            case "rename" :
                $sql          = "SHOW TABLES FROM `".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."` WHERE  `Tables_in_".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."` NOT LIKE '".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_RENAME_PREFIX'])."%'";
                $found_tables = null;
                if ($result       = mysqli_query($this->dbh, $sql)) {
                    while ($row = mysqli_fetch_row($result)) {
                        $found_tables[] = $row[0];
                    }
                    if (count($found_tables) > 0) {
                        foreach ($found_tables as $table_name) {
                            $sql    = "RENAME TABLE `".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."`.`".mysqli_real_escape_string($this->dbh, $table_name)."` TO  `".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."`.`".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_RENAME_PREFIX']).mysqli_real_escape_string($this->dbh, $table_name)."`";
                            if (!$result = mysqli_query($this->dbh, $sql)) {
                                DUPX_Log::error(sprintf(ERR_DBTRYRENAME, "{$this->post['dbname']}.{$table_name}"));
                            }
                        }
                        $this->rename_tbl_log = count($found_tables);
                    }
                }
                break;
        }
    }

    public function getRowCountMisMatchTables()
    {
        $nManager = DUPX_NOTICE_MANAGER::getInstance();
        
        $tableWiseRowCounts = $GLOBALS['DUPX_AC']->dbInfo->tableWiseRowCounts;
        $skipTables = array(
            $GLOBALS['DUPX_AC']->wp_tableprefix."duplicator_packages",
            $GLOBALS['DUPX_AC']->wp_tableprefix."options",
            $GLOBALS['DUPX_AC']->wp_tableprefix."duplicator_pro_packages",
            $GLOBALS['DUPX_AC']->wp_tableprefix."duplicator_pro_entities",
        );
        $misMatchTables = array();
        foreach ($tableWiseRowCounts as $table => $rowCount) {
            if (in_array($table, $skipTables)) {
                continue;
            }
            $sql = "SELECT count(*) as cnt FROM `".mysqli_real_escape_string($this->dbh, $table)."`";
            $result = mysqli_query($this->dbh, $sql); 
            if (false !== $result) {
                $row = mysqli_fetch_assoc($result);
                if ($rowCount != ($row['cnt'])) {
                    $errMsg = 'DATABASE: table '.DUPX_Log::varToString($table).' row count mismatch; expected '.DUPX_Log::varToString($rowCount).' in database'.DUPX_Log::varToString($row['cnt']);
                    DUPX_Log::info($errMsg);
                    $nManager->addBothNextAndFinalReportNotice(array(
                        'shortMsg' => 'Database Table row count validation was failed',
                        'level' => DUPX_NOTICE_ITEM::SOFT_WARNING,
                        'longMsg' => $errMsg."\n",
                        'sections' => 'database'
                    ), DUPX_NOTICE_MANAGER::ADD_UNIQUE_APPEND, 'row-count-mismatch');
                    
                    $misMatchTables[] = $table;
                }
            }
        }
        return $misMatchTables;
    }

    public function writeInDB()
    {
        //WRITE DATA
        $fcgi_buffer_pool  = 5000;
        $fcgi_buffer_count = 0;
        $counter           = 0;
        if (!empty($sql_data)) {
            $this->sql_result_data = $sql_data;
        }

        $handle = fopen($this->sql_file_path, 'rb');
       	if ($handle === false) {
            return false;
        }

        $nManager = DUPX_NOTICE_MANAGER::getInstance();

        @mysqli_autocommit($this->dbh, false);

        $query = null;
        $delimiter = ';';
        while (($line = fgets($handle)) !== false) {
            if ('DELIMITER ;' == trim($query)) {
                $delimiter = ';';
                $query = null;
                continue;
            }
            $query .= $line;
            if (preg_match('/'.$delimiter.'\s*$/S', $query)) {
                $query_strlen = strlen(trim($query));
                if ($this->dbvar_maxpacks < $query_strlen) {
                    $errorMsg = "**ERROR** Query size limit [length={$this->dbvar_maxpacks}] [sql=".substr($this->sql_result_data[$counter], 0, 75)."...]";
                    $this->dbquery_errs++;
                    $nManager->addNextStepNoticeMessage('QUERY ERROR: size limit' , DUPX_NOTICE_ITEM::SOFT_WARNING , DUPX_NOTICE_MANAGER::ADD_UNIQUE , 'query-size-limit-msg');
                    $nManager->addFinalReportNotice(array(
                            'shortMsg' => 'QUERY ERROR: size limit',
                            'level' => DUPX_NOTICE_ITEM::SOFT_WARNING,
                            'longMsg' => $errorMsg,
                            'sections' => 'database'
                    ));
                    DUPX_Log::info($errorMsg);
                } elseif ($query_strlen > 0) {
                    $query = $this->nbspFix($query);
                    $query = $this->applyQueryCollationFallback($query);
                    $query = $this->applyQueryProcAndViewFix($query);

                    // $query = $this->queryDelimiterFix($query);
                    $query = trim($query);
                    if (0 === strpos($query, "DELIMITER")) {
                        // Ending delimiter
                        // control never comes in this if condition, but written
                        if ('DELIMITER ;' == $query) {
                            $delimiter = ';';
                        } else { // starting delimiter
                            $delimiter =  substr($query, 10);
                            $delimiter =  trim($delimiter);
                        }

                        DUPX_Log::info("Skipping delimiter query");
                        $query = null;
                        continue;
                    }

					$result = @mysqli_query($this->dbh, $query);
					if ($result instanceof mysqli_result){
						@mysqli_free_result($result);
					}

                    $err = mysqli_error($this->dbh);
                    //Check to make sure the connection is alive
                    if (!empty($err)) {
                        if (!mysqli_ping($this->dbh)) {
                            mysqli_close($this->dbh);
                            $this->dbh = DUPX_DB::connect($this->post['dbhost'], $this->post['dbuser'], $this->post['dbpass'], $this->post['dbname']);
                            // Reset session setup
                            @mysqli_query($this->dbh, "SET wait_timeout = ".mysqli_real_escape_string($this->dbh, $GLOBALS['DB_MAX_TIME']));
                            DUPX_DB::setCharset($this->dbh, $this->post['dbcharset'], $this->post['dbcollate']);
                        }
                        $errMsg = "**ERROR** database error write '{$err}' - [sql=".substr($query, 0, 75)."...]";
                        DUPX_Log::info($errMsg);

                        if (DUPX_U::contains($err, 'Unknown collation')) {
                            $nManager->addNextStepNotice(array(
                                'shortMsg' => 'DATABASE ERROR: database error write',
                                'level' => DUPX_NOTICE_ITEM::HARD_WARNING,
                                'longMsg' => 'Unknown collation<br>RECOMMENDATION: Try resolutions found at https://snapcreek.com/duplicator/docs/faqs-tech/#faq-installer-110-q',
                                'faqLink' => array(
                                    'url' => 'https://snapcreek.com/duplicator/docs/faqs-tech/#faq-installer-110-q',
                                    'label' => 'FAQ Link'
                                )
                            ), DUPX_NOTICE_MANAGER::ADD_UNIQUE , 'query-collation-write-msg');
                            $nManager->addFinalReportNotice(array(
                                'shortMsg' => 'DATABASE ERROR: database error write',
                                'level' => DUPX_NOTICE_ITEM::HARD_WARNING,
                                'longMsg' => 'Unknown collation<br>RECOMMENDATION: Try resolutions found at https://snapcreek.com/duplicator/docs/faqs-tech/#faq-installer-110-q'.'<br>'.$errMsg,
                                'sections' => 'database',
                                'faqLink' => array(
                                    'url' => 'https://snapcreek.com/duplicator/docs/faqs-tech/#faq-installer-110-q',
                                    'label' => 'FAQ Link'
                                )
                            ));
                            DUPX_Log::info('RECOMMENDATION: Try resolutions found at https://snapcreek.com/duplicator/docs/faqs-tech/#faq-installer-110-q');
                        } else {
                            $nManager->addNextStepNoticeMessage('DATABASE ERROR: database error write' , DUPX_NOTICE_ITEM::SOFT_WARNING , DUPX_NOTICE_MANAGER::ADD_UNIQUE , 'query-write-msg');
                            $nManager->addFinalReportNotice(array(
                                'shortMsg' => 'DATABASE ERROR: database error write',
                                'level' => DUPX_NOTICE_ITEM::SOFT_WARNING,
                                'longMsg' => $errMsg,
                                'sections' => 'database'
                            ));
                        }

                        $this->dbquery_errs++;

                        //Buffer data to browser to keep connection open
                    } else {
                        if ($fcgi_buffer_count++ > $fcgi_buffer_pool) {
                            $fcgi_buffer_count = 0;
                        }
                        $this->dbquery_rows++;
                    }
                }
                $query = null;
                $counter++;
            }
        }
        @mysqli_commit($this->dbh);
        @mysqli_autocommit($this->dbh, true);

        $nManager ->saveNotices();

        //DATA CLEANUP: Perform Transient Cache Cleanup
        //Remove all duplicator entries and record this one since this is a new install.
        $dbdelete_count1 = 0;
        $dbdelete_count2 = 0;

        @mysqli_query($this->dbh, "DELETE FROM `".mysqli_real_escape_string($this->dbh, $GLOBALS['DUPX_AC']->wp_tableprefix)."duplicator_packages`");
        $dbdelete_count1 = @mysqli_affected_rows($this->dbh);

        @mysqli_query($this->dbh,
                "DELETE FROM `".mysqli_real_escape_string($this->dbh, $GLOBALS['DUPX_AC']->wp_tableprefix)."options` WHERE `option_name` LIKE ('_transient%') OR `option_name` LIKE ('_site_transient%')");
        $dbdelete_count2 = @mysqli_affected_rows($this->dbh);

        mysqli_query($this->dbh, "DELETE FROM `".mysqli_real_escape_string($this->dbh, $GLOBALS['DUPX_AC']->wp_tableprefix)."options` WHERE `option_name` = 'duplicator_usage_id'");
        $dbdelete_count3 = @mysqli_affected_rows($this->dbh);
        $this->dbdelete_count += (abs($dbdelete_count1) + abs($dbdelete_count2) + abs($dbdelete_count3));

        //Reset Duplicator Options
		if (DUPX_U::isTraversable($GLOBALS['DUPX_AC']->opts_delete)) {
			foreach ($GLOBALS['DUPX_AC']->opts_delete as $value) {
				mysqli_query($this->dbh, "DELETE FROM `".mysqli_real_escape_string($this->dbh, $GLOBALS['DUPX_AC']->wp_tableprefix)."options` WHERE `option_name` = '".mysqli_real_escape_string($this->dbh, $value)."'");
			}
		}
		
        //Remove views from DB
        if (!$this->dbobj_views) {
            $this->dropViews();
            DUPX_Log::info("DB VIEWS:\tdisabled");
        } else {
            DUPX_Log::info("DB VIEWS:\tenabled");
        }

        //Remove procedures from DB
        if (!$this->dbobj_procs) {
            $this->dropProcs();
            DUPX_Log::info("DB PROCEDURES:\tdisabled");
        } else {
            DUPX_Log::info("DB PROCEDURES:\tenabled");
        }
    }

    private function dropTables()
    {
        $sql          = "SHOW FULL TABLES WHERE Table_Type != 'VIEW'";
        $found_tables = null;
        if ($result       = mysqli_query($this->dbh, $sql)) {
            while ($row = mysqli_fetch_row($result)) {
                $found_tables[] = $row[0];
            }
            if ($found_tables != null && count($found_tables) > 0) {
                mysqli_query($this->dbh, "SET FOREIGN_KEY_CHECKS = 0;");
                foreach ($found_tables as $table_name) {
                    $sql    = "DROP TABLE `".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."`.`".mysqli_real_escape_string($this->dbh, $table_name)."`";
                    if (!$result = mysqli_query($this->dbh, $sql)) {
                        DUPX_Log::error(sprintf(ERR_DROP_TABLE_TRYCLEAN, $table_name, $this->post['dbname'], mysqli_error($this->dbh)));
                    }
                }
                $this->drop_tbl_log = count($found_tables);
                mysqli_query($this->dbh, "SET FOREIGN_KEY_CHECKS = 1;");
            }
        }
    }

    private function dropProcs()
    {
        $sql    = "SHOW PROCEDURE STATUS WHERE db='{$this->post['dbname']}'";
        $found  = array();
        if ($result = mysqli_query($this->dbh, $sql)) {
            while ($row = mysqli_fetch_row($result)) {
                $found[] = $row[1];
            }
            if (count($found) > 0) {
                $nManager = DUPX_NOTICE_MANAGER::getInstance();

                foreach ($found as $proc_name) {
                    $sql    = "DROP PROCEDURE IF EXISTS `".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."`.`".mysqli_real_escape_string($this->dbh, $proc_name)."`";
                    if (!$result = mysqli_query($this->dbh, $sql)) {
                        $err = mysqli_error($this->dbh);

                        $nManager->addNextStepNotice(array(
                            'shortMsg'    => 'PROCEDURE CLEAN ERROR',
                            'level'       => DUPX_NOTICE_ITEM::SOFT_WARNING,
                            'longMsg'     => sprintf('Unable to remove PROCEDURE "%s" from database "%s".<br/>', $proc_name, $this->post['dbname']),
                            'longMsgMode' => DUPX_NOTICE_ITEM::MSG_MODE_HTML,
                        ), DUPX_NOTICE_MANAGER::ADD_UNIQUE_APPEND, 'drop-proc-fail-msg');

                        $nManager->addFinalReportNotice(array(
                            'shortMsg'    => 'PROCEDURE CLEAN ERROR: '.$err,
                            'level'       => DUPX_NOTICE_ITEM::SOFT_WARNING,
                            'longMsg'     => sprintf('Unable to remove PROCEDURE "%s" from database "%s".', $proc_name, $this->post['dbname']),
                            'longMsgMode' => DUPX_NOTICE_ITEM::MSG_MODE_HTML,
                            'sections'    => 'database',
                        ));

                        DUPX_Log::info("PROCEDURE CLEAN ERROR: '{$err}'\n\t[SQL=".substr($sql, 0, self::QUERY_ERROR_LOG_LEN)."...]\n\n");
                    }
                }

                $nManager->addNextStepNotice(array(
                    'shortMsg'    => 'PROCEDURE CLEAN ERROR',
                    'level'       => DUPX_NOTICE_ITEM::SOFT_WARNING,
                    'longMsg'     => sprintf(ERR_DROP_PROCEDURE_TRYCLEAN, mysqli_error($this->dbh)),
                    'longMsgMode' => DUPX_NOTICE_ITEM::MSG_MODE_HTML,
                ), DUPX_NOTICE_MANAGER::ADD_UNIQUE_PREPEND_IF_EXISTS, 'drop-proc-fail-msg');
            }
        }
    }

    private function dropViews()
    {
        $sql         = "SHOW FULL TABLES WHERE Table_Type = 'VIEW'";
        $found_views = null;
        if ($result      = mysqli_query($this->dbh, $sql)) {
            while ($row = mysqli_fetch_row($result)) {
                $found_views[] = $row[0];
            }
            if (!is_null($found_views) && count($found_views) > 0) {
                $nManager = DUPX_NOTICE_MANAGER::getInstance();

                foreach ($found_views as $view_name) {
                    $sql    = "DROP VIEW `".mysqli_real_escape_string($this->dbh, $this->post['dbname'])."`.`".mysqli_real_escape_string($this->dbh, $view_name)."`";
                    if (!$result = mysqli_query($this->dbh, $sql)) {
                        $err = mysqli_error($this->dbh);

                        $nManager->addNextStepNotice(array(
                            'shortMsg'    => 'VIEW CLEAN ERROR',
                            'level'       => DUPX_NOTICE_ITEM::SOFT_WARNING,
                            'longMsg'     => sprintf('Unable to remove VIEW "%s" from database "%s".<br/>', $view_name, $this->post['dbname']),
                            'longMsgMode' => DUPX_NOTICE_ITEM::MSG_MODE_HTML,
                        ), DUPX_NOTICE_MANAGER::ADD_UNIQUE_APPEND, 'drop-view-fail-msg');

                        $nManager->addFinalReportNotice(array(
                            'shortMsg'    => 'VIEW CLEAN ERROR: '.$err,
                            'level'       => DUPX_NOTICE_ITEM::SOFT_WARNING,
                            'longMsg'     => sprintf('Unable to remove VIEW "%s" from database "%s"', $view_name, $this->post['dbname']),
                            'longMsgMode' => DUPX_NOTICE_ITEM::MSG_MODE_HTML,
                            'sections'    => 'database',
                        ));

                        DUPX_Log::info("VIEW CLEAN ERROR: '{$err}'\n\t[SQL=".substr($sql, 0, self::QUERY_ERROR_LOG_LEN)."...]\n\n");
                    }
                }

                $nManager->addNextStepNotice(array(
                    'shortMsg'    => 'VIEW CLEAN ERROR',
                    'level'       => DUPX_NOTICE_ITEM::SOFT_WARNING,
                    'longMsg'     => sprintf(ERR_DROP_VIEW_TRYCLEAN, mysqli_error($this->dbh)),
                    'longMsgMode' => DUPX_NOTICE_ITEM::MSG_MODE_HTML,
                ), DUPX_NOTICE_MANAGER::ADD_UNIQUE_PREPEND_IF_EXISTS, 'drop-view-fail-msg');

            }
        }
    }

    public function writeLog()
    {
        $nManager = DUPX_NOTICE_MANAGER::getInstance();
        $nManager->saveNotices();

        DUPX_Log::info("ERRORS FOUND:\t{$this->dbquery_errs}");
        DUPX_Log::info("DROPPED TABLES:\t{$this->drop_tbl_log}");
        DUPX_Log::info("RENAMED TABLES:\t{$this->rename_tbl_log}");
        DUPX_Log::info("QUERIES RAN:\t{$this->dbquery_rows}\n");

        $this->dbtable_rows  = 1;
        $this->dbtable_count = 0;

        if ($result = mysqli_query($this->dbh, "SHOW TABLES")) {
            while ($row = mysqli_fetch_array($result, MYSQLI_NUM)) {
                $table_rows         = DUPX_DB::countTableRows($this->dbh, $row[0]);
                $this->dbtable_rows += $table_rows;
                DUPX_Log::info("{$row[0]}: ({$table_rows})");
                $this->dbtable_count++;
            }
            @mysqli_free_result($result);
        }

        DUPX_Log::info("Removed '{$this->dbdelete_count}' cache/transient rows");

        if ($this->dbtable_count == 0) {
            DUPX_Log::info("NOTICE: You may have to manually run the installer-data.sql to validate data input.
             Also check to make sure your installer file is correct and the table prefix
             '{$GLOBALS['DUPX_AC']->wp_tableprefix}' is correct for this particular version of WordPress. \n");
        }
    }

    public function getJSON($json)
    {
        $json['table_count'] = $this->dbtable_count;
        $json['table_rows']  = $this->dbtable_rows;
        $json['query_errs']  = $this->dbquery_errs;

        return $json;
    }

    private function applyQueryCollationFallback($query) {
        if (!empty($this->post['dbcolsearchreplace']) && $this->post['dbcollatefb']) {
            $collation_replace_list = json_decode(stripslashes($this->post['dbcolsearchreplace']), true);

            if ($collation_replace_list === null) {
                DUPX_Log::info("WARNING: Cannot decode collation replace list JSON.\n", 1);
                return;
            }

            if (!empty($collation_replace_list)) {

                if ($this->firstOrNotChunking()) {
                    DUPX_Log::info("LEGACY COLLATION FALLBACK:\n\tRunning the following replacements:\n\t".stripslashes($this->post['dbcolsearchreplace']));
                }

                foreach ($collation_replace_list as $val) {
                    $replace_charset = false;
                    if (strpos($val['search'], 'utf8mb4') !== false && strpos($val['replace'], 'utf8mb4') === false) {
                        $replace_charset = true;
                    }
                    /*
                    foreach ($this->sql_result_data as $key => $query) {
                    */
                    if (strpos($query, $val['search'])) {
                        $query = str_replace($val['search'], $val['replace'], $query);
                        $sub_query                   = str_replace("\n", '', substr($query, 0, 80));
                        DUPX_Log::info("\tNOTICE: {$val['search']} replaced by {$val['replace']} in query [{$sub_query}...]");
                    }
                    if ($replace_charset && strpos($query, 'utf8mb4')) {
                        $query = str_replace('utf8mb4', 'utf8', $query);
                        $sub_query                   = str_replace("\n", '', substr($query, 0, 80));
                        DUPX_Log::info("\tNOTICE: utf8mb4 replaced by utf8 in query [{$sub_query}...]");
                    }
                    /*
                    }
                    */
                }
            }
        }

        return $query;
    }

    private function applyProcUserFix()
    {
        foreach ($this->sql_result_data as $key => $query) {
            if (preg_match("/DEFINER.*PROCEDURE/", $query) === 1) {
                $query                       = preg_replace("/DEFINER.*PROCEDURE/", "PROCEDURE", $query);
                $query                       = str_replace("BEGIN", "SQL SECURITY INVOKER\nBEGIN", $query);
                $this->sql_result_data[$key] = $query;
            }
        }
    }

    private function applyQueryProcAndViewFix($query)
    {
        return preg_replace(array(
            self::USER_DEFINER_PATTERN,
            self::SQL_SECURITY_INVOKER_PATTERN
        ), array(
            $this->dbDefinerReplace,
            self::SQL_SECURITY_INVOKER_REPLACE
        ), $query);
    }

    private function delimiterFix($counter)
    {
        $firstQuery = trim(preg_replace('/\s\s+/', ' ', $this->sql_result_data[$counter]));
        $start      = $counter;
        $end        = 0;
        if (strpos($firstQuery, "DELIMITER") === 0) {
            $this->sql_result_data[$start] = "";
            $continueSearch                = true;
            while ($continueSearch) {
                $counter++;
                if (strpos($this->sql_result_data[$counter], 'DELIMITER') === 0) {
                    $continueSearch        = false;
                    unset($this->sql_result_data[$counter]);
                    $this->sql_result_data = array_values($this->sql_result_data);
                } else {
                    $this->sql_result_data[$start] .= $this->sql_result_data[$counter].";\n";
                    unset($this->sql_result_data[$counter]);
                }
            }
        }
    }

    public function nbspFix($sql)
    {
        if ($this->post['dbnbsp']) {
            if ($this->firstOrNotChunking()) {
                DUPX_Log::info("ran fix non-breaking space characters\n");
            }
            $sql = preg_replace('/\xC2\xA0/', ' ', $sql);
        }
        return $sql;
    }

    public function firstOrNotChunking()
    {
        return (!isset($this->post['continue_chunking']) || $this->post['first_chunk']);
    }

    public function __destruct()
    {
        @mysqli_close($this->dbh);
    }
}