<?php

namespace MainWP\Child;

class MainWP_Child_DB {
	// phpcs:disable WordPress.DB.RestrictedFunctions, WordPress.DB.PreparedSQL.NotPrepared -- unprepared SQL ok, accessing the database directly to custom database functions.
	// Support old & new versions of WordPress (3.9+).
	public static function use_mysqli() {
		/** @var $wpdb wpdb */
		if ( ! function_exists( '\mysqli_connect' ) ) {
			return false;
		}

		global $wpdb;

		return ( $wpdb->dbh instanceof \mysqli );
	}

	public static function to_query( $query, $link ) {
		if ( self::use_mysqli() ) {
			return \mysqli_query( $link, $query );
		} else {
			return \mysql_query( $query, $link );
		}
	}

	public static function fetch_array( $result ) {
		if ( self::use_mysqli() ) {
			return \mysqli_fetch_array( $result, MYSQLI_ASSOC );
		} else {
			return \mysql_fetch_array( $result, MYSQL_ASSOC );
		}
	}

	public static function num_rows( $result ) {
		if ( self::use_mysqli() ) {
			return \mysqli_num_rows( $result );
		} else {
			return \mysql_num_rows( $result );
		}
	}

	public static function connect( $host, $user, $pass ) {
		if ( self::use_mysqli() ) {
			return \mysqli_connect( $host, $user, $pass );
		} else {
			return \mysql_connect( $host, $user, $pass );
		}
	}

	public static function select_db( $db ) {
		if ( self::use_mysqli() ) {
			/** @var $wpdb wpdb */
			global $wpdb;

			return \mysqli_select_db( $wpdb->dbh, $db );
		} else {
			return \mysql_select_db( $db );
		}
	}

	public static function error() {
		if ( self::use_mysqli() ) {
			/** @var $wpdb wpdb */
			global $wpdb;

			return \mysqli_error( $wpdb->dbh );
		} else {
			return \mysql_error();
		}
	}

	public static function real_escape_string( $value ) {
		/** @var $wpdb wpdb */
		global $wpdb;

		if ( self::use_mysqli() ) {
			return \mysqli_real_escape_string( $wpdb->dbh, $value );
		} else {
			return \mysql_real_escape_string( $value, $wpdb->dbh );
		}
	}

	public static function is_result( $result ) {
		if ( self::use_mysqli() ) {
			return ( $result instanceof mysqli_result );
		} else {
			return is_resource( $result );
		}
	}

	public static function get_size() {
		/** @var $wpdb wpdb */
		global $wpdb;

		$rows = self::to_query( 'SHOW table STATUS', $wpdb->dbh );
		$size = 0;
		while ( $row = self::fetch_array( $rows ) ) {
			$size += $row['Data_length'];
		}

		return $size;
	}
}