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if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Backup {

    private $path;
    private $default;
    var $CI;

    public function getPath() {
        return $this->path;
    }

    public function setPath($path) {
        $this->path = $path;
    }
    public function initialize($Path = NULL){
        if ($Path) {
            $this->path = $Path;
        }        
    }
    public function __construct($Path = NULL) {
        $this->initialize($Path);
        $this->CI = &get_instance();
        $this->CI->config->load('constantes');
        $this->default = $this->CI->config->item('configdb');
        $this->default = $this->default[0];
    }

    public function __destruct() {
        unset($path, $this->CI, $this->default, $this);
    }
    public function doBackup($layout_table = TRUE, $insert_table = TRUE, $save_sql = TRUE, $download = FALSE, $prefix=NULL){
        $tables = $this->CI->db
                ->query('SHOW TABLES')
                ->result_array();
        $nametb = '';
        for ($i=0; $i < count($tables); $i++) {
            $n = array_values($tables[$i]);
            if ($nametb===''){
                $nametb .= $n[0];
            } else {
                $nametb .= ','.$n[0];
            }            
        }
        $tables = explode(',', $nametb);
        $return = '';        
        foreach ($tables as $table) {
            //CREATE TABLE LAYOUT
            $result = $this->CI->db
                        ->query('SELECT * FROM ' . $table);
            if ($layout_table === TRUE) {
                $return .= 'DROP TABLE ' . $table . ';';
                $row2 = $this->CI->db
                            ->query('SHOW CREATE TABLE ' . $table)
                            ->result_array();            
                $return.= "\n\n" . $row2[0]['Create Table'] . ";\n\n";            
            }
            //CREATE INSERT
            if ($insert_table === TRUE) {
                foreach($result->result_array() as $row){
                    $fields = implode(",", array_keys($row));
                    $values = '"'.implode('","', array_values($row)).'"';
                    $return.= 'INSERT INTO '.$table.'('.$fields.') VALUES('.$values.');';                    
                    $return.= "\n";
                }                        
            }
            $return.="\n\n\n";
        }
        //CREATE SAVE PATH ARQUIVO 
        $sql_save = $this->path.$prefix.'-db-backup.'.date('d_m_Y_G_i_s').'.sql';
        if ($save_sql === TRUE) {  
            chmod($this->path, 0777);
            $handle = fopen($sql_save, 'w+');
            fwrite($handle, $return);
            fclose($handle);
            chmod($this->path, 0700);  
        }
        if ($download === TRUE && file_exists($sql_save) && is_file($sql_save)) {
            $this->CI->load->library('zip');
            $this->CI->zip->read_file($sql_save);
            $this->CI->zip->download('db-backup.sql.zip');
        }          
    }
    private function table_db_backup($Path = NULL) {
        if ($Path) {
            $this->path = $Path;
        }
        $dbhost = $this->default['localhost'];
        $dbuser = $this->default['username'];
        $dbpass = $this->default['password'];
        $dbname = $this->default['database'];
        $output = '';
        $filename = "database_backup_$dbname" . date('d-m-Y-G-i-s') . '.sql';
        exec("mysqldump -u $dbuser -p$dbpass $dbname  > {$this->path}" . $filename, $output);
        var_dump($output);
    }

    private function tables_db_backup($Path = NULL, $tables = '*') {
        if ($Path) {
            $this->path = $Path;
        }
        $host = $this->default['localhost'];
        $user = $this->default['username'];
        $pass = $this->default['password'];
        $name = $this->default['database'];
        $link = mysql_connect($host, $user, $pass);
        mysql_select_db($name, $link);
        //get all of the tables
        if ($tables == '*') {
            $tables = array();
            $result = mysql_query('SHOW TABLES');
            while ($row = mysql_fetch_row($result)) {
                $tables[] = $row[0];
            }
        } else {
            $tables = is_array($tables) ? $tables : explode(',', $tables);
        }
        //cycle through
        $return = '';
        foreach ($tables as $table) {
            $result = mysql_query('SELECT * FROM ' . $table);
            $num_fields = mysql_num_fields($result);
            $return .= 'DROP TABLE ' . $table . ';';
            $row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE ' . $table));
            $return.= "\n\n" . $row2[1] . ";\n\n";

            for ($i = 0; $i < $num_fields; $i++) {
                while ($row = mysql_fetch_row($result)) {
                    $return.= 'INSERT INTO ' . $table . ' VALUES(';
                    for ($j = 0; $j < $num_fields; $j++) {
                        $row[$j] = addslashes($row[$j]);
                        $row[$j] = str_replace("\n", "\\n", $row[$j]);
                        if (isset($row[$j])) {
                            $return.= '"' . $row[$j] . '"';
                        } else {
                            $return.= '""';
                        }
                        if ($j < ($num_fields - 1)) {
                            $return.= ',';
                        }
                    }
                    $return.= ");\n";
                }
            }
            $return.="\n\n\n";
        }
        //save file
        $handle = fopen($this->path . '/db-backup-' . time() . '-' . (md5(implode(',', $tables))) . '.sql', 'w+');
        fwrite($handle, $return);
        fclose($handle);
    }
}