<?php
class BootGrid {

    static function getSqlFromPost($searchFieldsNames = array(), $keyPrefix = "", $alternativeOrderBy = "", $doNotSearch=false, $FIND_IN_SET = "") {
        if(empty($doNotSearch)){
            $sql = self::getSqlSearchFromPost($searchFieldsNames);
        }else{
            $sql = "";
        }
        
        if(empty($_POST['sort']) && !empty($_GET['order'][0]['dir'])){
            $index = intval($_GET['order'][0]['column']);
            $_GET['columns'][$index]['data'];
            $_POST['sort'][$_GET['columns'][$index]['data']] = $_GET['order'][0]['dir'];
        }
        
        
        if(!empty($FIND_IN_SET)){
            $sql .= " ORDER BY FIND_IN_SET({$FIND_IN_SET}) DESC ";
        }else if (!empty($_POST['sort'])) {
            $orderBy = array();
            foreach ($_POST['sort'] as $key => $value) {
                $direction = "ASC";
                if(strtoupper($value)==="DESC"){
                    $direction = "DESC";
                }
                $key = preg_replace("/[^A-Za-z0-9._ ]/", '', $key);
                if($key=='order'){
                    $key = '`order`';
                }
                $orderBy[] = " {$keyPrefix}{$key} {$direction} ";
            }
            $sql .= " ORDER BY ".implode(",", $orderBy);
        } else {
            $sql .= $alternativeOrderBy;
        }

        if (empty($_POST['rowCount']) && !empty($_GET['length'])) {
            $_POST['rowCount'] = intval($_GET['length']);
        }

        if (empty($_POST['current']) && !empty($_GET['start'])) {
            $_POST['current'] = ($_GET['start'] / $_GET['length']) + 1;
        } else if (empty($_POST['current']) && isset($_GET['start'])) {
            $_POST['current'] = 1;
        }

        $_POST['current'] = intval(@$_POST['current']);
        $_POST['rowCount'] = intval(@$_POST['rowCount']);
        
        if(!empty($_POST['rowCount']) && $_POST['rowCount']>0){
            if(empty($_POST['current'])){
                $_POST['current'] = 1;
            }
            $_POST['rowCount'] = intval($_POST['rowCount']);
            $_POST['current'] = intval($_POST['current']);
            $current = intval(($_POST['current']-1)*$_POST['rowCount']);
            $current = $current<0?0:$current;
            $sql .= " LIMIT $current, {$_POST['rowCount']} ";
        }else{
            $_POST['current'] = 0;
            $_POST['rowCount'] = 0;
        }
        return $sql;
    }

    static function getSqlSearchFromPost($searchFieldsNames = array(), $connection = "AND") {
        $sql = "";
        if (!empty($_GET['searchPhrase'])) {
            $_POST['searchPhrase'] = $_GET['searchPhrase'];
        } else if (!empty($_GET['search']['value'])) {
            $_POST['searchPhrase'] = $_GET['search']['value'];
        }else if (!empty($_GET['q'])) {
            $_POST['searchPhrase'] = $_GET['q'];
        }
        
        if(!empty($_POST['searchPhrase'])){
            global $global;
            $search = $global['mysqli']->real_escape_string(xss_esc($_POST['searchPhrase']));

            $like = array();
            foreach ($searchFieldsNames as $value) {
                $like[] = " {$value} LIKE '%{$search}%' ";
                // for accent insensitive
                $like[] = " CONVERT(CAST({$value} as BINARY) USING utf8) LIKE '%{$search}%' ";
            }
            if(!empty($like)){
                $sql .= " {$connection} (". implode(" OR ", $like).")";
            }else{
                $sql .= " {$connection} 1=1 ";
            }
        }

        return $sql;
    }

}