<?php

class Sql_model extends MO_Model
{
    public function __construct()
    {
        parent::__construct();
    }

    //updates the db version, to current time, only used when saving a change as sql which already in db
    //like changes from phpmyadmin
    //dummy function to call the inherited _update_db_version($time);
    public function update_db_version($time)
    {
        $this->_update_db_version($time);
    }

    //dummy function which uses inherited _create_sql($sql);
    public function create_sql($sql)
    {
        $this->_create_sql($sql);
    }

    public function get_db_version()
    {
        $sql = "SELECT version FROM db_version WHERE id='1'";

        $q = $this->db->query($sql);

        $res = $q->row_array();

        return $res['version'];
    }

    public function get_appliable_files()
    {
        $this->load->helper('file');
        //$full_list = get_filenames('./sql');
    
        $this->load->helper('directory');
        $full_list = directory_map('./sql', 1);

        //get out the full db dumps
        foreach ($full_list as $row) {
            if (substr_compare($row, 'db', 0, 2, true) && substr_compare($row, 'map', 0, 3, true) &&
      substr_compare($row, 'old', 0, 3, true) && substr_compare($row, 'index', 0, 5, true)) {
                $list[] = $row;
            }
        }

        if (!isset($list)) {
            return 0;
        }

        $ver = $this->get_db_version();

        foreach ($list as $row) {
            $l = explode('.', $row);

            if ($l[0] > $ver) {
                $data[] = $row;
            }
        }

        if (!isset($data)) {
            return 0;
        }

        //getting the max
        $max = 0;

        foreach ($data as $row) {
            $l = explode('.', $row);

            if ($l[0] > $max) {
                $max = $l[0];
            }
        }

        $smallest = $max;
        $last_found = 0;

        $ordered[] = $max . ".sql";

        for ($i = 0; $i < (sizeof($data) - 1); $i++) {
            foreach ($data as $row) {
                $l = explode('.', $row);

                if (($l[0] < $smallest) && ($l[0] > $last_found)) {
                    $smallest = $l[0];
                    $ord = $row;
                }
            }

            $last_found = $smallest;
            $smallest = $max;
            $ordered[$i] = $ord;
        }

        if (isset($ordered)) {
            return $ordered;
        } else {
            return 0;
        }
    }

    public function apply_all_sql()
    {
        $this->load->helper('file');

        $list = $this->get_appliable_files();

        if (!$list) {
            return;
        }

        for ($i = 0; $i < sizeof($list); $i++) {
            //reading file, then applying it to the db
            $loc = './sql/' . $list[$i];
            $sql = read_file($loc);
      
            var_dump($loc);

            $this->db->query($sql);

            //TODO check if error happened, then stop everything
            //check is not needed, it just throws the error
      
            //update db_version
            $ver = explode('.', $list[$i]);
            $sqlv = "UPDATE db_version SET version='" . $ver[0] . "' WHERE id='1'";
            $this->db->query($sqlv);
        }
    }
}
//nowhitesp