<?php defined('BASEPATH') OR exit('No direct script access allowed');

class Reports_model extends CI_Model
{

    public function __construct()
    {
        parent::__construct();
    }

    public function getProductNames($term, $limit = 5)
    {
        $this->db->select('id, code, name')
            ->like('name', $term, 'both')->or_like('code', $term, 'both');
        $this->db->limit($limit);
        $q = $this->db->get('products');
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getStaff()
    {
        if ($this->Admin) {
            $this->db->where('group_id !=', 1);
        }
        $this->db->where('group_id !=', 3)->where('group_id !=', 4);
        $q = $this->db->get('users');
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getSalesTotals($customer_id)
    {

        $this->db->select('SUM(COALESCE(grand_total, 0)) as total_amount, SUM(COALESCE(paid, 0)) as paid', FALSE)
            ->where('customer_id', $customer_id);
        $q = $this->db->get('sales');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getCustomerSales($customer_id)
    {
        $this->db->from('sales')->where('customer_id', $customer_id);
        return $this->db->count_all_results();
    }

    public function getCustomerQuotes($customer_id)
    {
        $this->db->from('quotes')->where('customer_id', $customer_id);
        return $this->db->count_all_results();
    }

    public function getCustomerReturns($customer_id)
    {
        $this->db->from('sales')->where('customer_id', $customer_id)->where('sale_status', 'returned');
        return $this->db->count_all_results();
    }

    public function getStockValue()
    {
        $q = $this->db->query("SELECT SUM(by_price) as stock_by_price, SUM(by_cost) as stock_by_cost FROM ( Select COALESCE(sum(" . $this->db->dbprefix('warehouses_products') . ".quantity), 0)*price as by_price, COALESCE(sum(" . $this->db->dbprefix('warehouses_products') . ".quantity), 0)*cost as by_cost FROM " . $this->db->dbprefix('products') . " JOIN " . $this->db->dbprefix('warehouses_products') . " ON " . $this->db->dbprefix('warehouses_products') . ".product_id=" . $this->db->dbprefix('products') . ".id GROUP BY " . $this->db->dbprefix('products') . ".id )a");
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getWarehouseStockValue($id)
    {
        $q = $this->db->query("SELECT SUM(by_price) as stock_by_price, SUM(by_cost) as stock_by_cost FROM ( Select sum(COALESCE(" . $this->db->dbprefix('warehouses_products') . ".quantity, 0))*price as by_price, sum(COALESCE(" . $this->db->dbprefix('warehouses_products') . ".quantity, 0))*cost as by_cost FROM " . $this->db->dbprefix('products') . " JOIN " . $this->db->dbprefix('warehouses_products') . " ON " . $this->db->dbprefix('warehouses_products') . ".product_id=" . $this->db->dbprefix('products') . ".id WHERE " . $this->db->dbprefix('warehouses_products') . ".warehouse_id = ? GROUP BY " . $this->db->dbprefix('products') . ".id )a", array($id));
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    // public function getmonthlyPurchases()
    // {
    //     $myQuery = "SELECT (CASE WHEN date_format( date, '%b' ) Is Null THEN 0 ELSE date_format( date, '%b' ) END) as month, SUM( COALESCE( total, 0 ) ) AS purchases FROM purchases WHERE date >= date_sub( now( ) , INTERVAL 12 MONTH ) GROUP BY date_format( date, '%b' ) ORDER BY date_format( date, '%m' ) ASC";
    //     $q = $this->db->query($myQuery);
    //     if ($q->num_rows() > 0) {
    //         foreach (($q->result()) as $row) {
    //             $data[] = $row;
    //         }
    //         return $data;
    //     }
    //     return FALSE;
    // }

    public function getChartData()
    {
        $myQuery = "SELECT S.month,
        COALESCE(S.sales, 0) as sales,
        COALESCE( P.purchases, 0 ) as purchases,
        COALESCE(S.tax1, 0) as tax1,
        COALESCE(S.tax2, 0) as tax2,
        COALESCE( P.ptax, 0 ) as ptax
        FROM (  SELECT  date_format(date, '%Y-%m') Month,
                SUM(total) Sales,
                SUM(product_tax) tax1,
                SUM(order_tax) tax2
                FROM " . $this->db->dbprefix('sales') . "
                WHERE date >= date_sub( now( ) , INTERVAL 12 MONTH )
                GROUP BY date_format(date, '%Y-%m')) S
            LEFT JOIN ( SELECT  date_format(date, '%Y-%m') Month,
                        SUM(product_tax) ptax,
                        SUM(order_tax) otax,
                        SUM(total) purchases
                        FROM " . $this->db->dbprefix('purchases') . "
                        GROUP BY date_format(date, '%Y-%m')) P
            ON S.Month = P.Month
            ORDER BY S.Month";
        $q = $this->db->query($myQuery);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getDailySales($year, $month, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%e' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
			FROM " . $this->db->dbprefix('sales') . " WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " DATE_FORMAT( date,  '%Y-%m' ) =  '{$year}-{$month}'
			GROUP BY DATE_FORMAT( date,  '%e' )";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getMonthlySales($year, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%c' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
			FROM " . $this->db->dbprefix('sales') . " WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " DATE_FORMAT( date,  '%Y' ) =  '{$year}'
			GROUP BY date_format( date, '%c' ) ORDER BY date_format( date, '%c' ) ASC";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getStaffDailySales($user_id, $year, $month, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%e' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
            FROM " . $this->db->dbprefix('sales')." WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " created_by = {$user_id} AND DATE_FORMAT( date,  '%Y-%m' ) =  '{$year}-{$month}'
            GROUP BY DATE_FORMAT( date,  '%e' )";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getStaffMonthlySales($user_id, $year, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%c' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
            FROM " . $this->db->dbprefix('sales') . " WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " created_by = {$user_id} AND DATE_FORMAT( date,  '%Y' ) =  '{$year}'
            GROUP BY date_format( date, '%c' ) ORDER BY date_format( date, '%c' ) ASC";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getPurchasesTotals($supplier_id)
    {
        $this->db->select('SUM(COALESCE(grand_total, 0)) as total_amount, SUM(COALESCE(paid, 0)) as paid', FALSE)
            ->where('supplier_id', $supplier_id);
        $q = $this->db->get('purchases');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getSupplierPurchases($supplier_id)
    {
        $this->db->from('purchases')->where('supplier_id', $supplier_id);
        return $this->db->count_all_results();
    }

    public function getStaffPurchases($user_id)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(grand_total, 0)) as total_amount, SUM(COALESCE(paid, 0)) as paid', FALSE)
            ->where('created_by', $user_id);
        $q = $this->db->get('purchases');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getStaffSales($user_id)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(grand_total, 0)) as total_amount, SUM(COALESCE(paid, 0)) as paid', FALSE)
            ->where('created_by', $user_id);
        $q = $this->db->get('sales');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalSales($start, $end, $warehouse_id = NULL)
    {
        $this->db->select('count(id) as total, sum(COALESCE(grand_total, 0)) as total_amount, SUM(COALESCE(paid, 0)) as paid, SUM(COALESCE(total_tax, 0)) as tax', FALSE)
            ->where('sale_status !=', 'pending')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        if ($warehouse_id) {
            $this->db->where('warehouse_id', $warehouse_id);
        }
        $q = $this->db->get('sales');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalPurchases($start, $end, $warehouse_id = NULL)
    {
        $this->db->select('count(id) as total, sum(COALESCE(grand_total, 0)) as total_amount, SUM(COALESCE(paid, 0)) as paid, SUM(COALESCE(total_tax, 0)) as tax', FALSE)
            ->where('status', 'received')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        if ($warehouse_id) {
            $this->db->where('warehouse_id', $warehouse_id);
        }
        $q = $this->db->get('purchases');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalExpenses($start, $end, $warehouse_id = NULL)
    {
        $this->db->select('count(id) as total, sum(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        if ($warehouse_id) {
            $this->db->where('warehouse_id', $warehouse_id);
        }
        $q = $this->db->get('expenses');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalPaidAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'sent')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalReceivedAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'received')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalReceivedCashAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'received')->where('paid_by', 'cash')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalReceivedCCAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'received')->where('paid_by', 'CC')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalReceivedChequeAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'received')->where('paid_by', 'Cheque')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalReceivedPPPAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'received')->where('paid_by', 'ppp')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalReceivedStripeAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'received')->where('paid_by', 'stripe')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getTotalReturnedAmount($start, $end)
    {
        $this->db->select('count(id) as total, SUM(COALESCE(amount, 0)) as total_amount', FALSE)
            ->where('type', 'returned')
            ->where('date BETWEEN ' . $start . ' and ' . $end);
        $q = $this->db->get('payments');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getWarehouseTotals($warehouse_id = NULL)
    {
        $this->db->select('sum(quantity) as total_quantity, count(id) as total_items', FALSE);
        $this->db->where('quantity !=', 0);
        if ($warehouse_id) {
            $this->db->where('warehouse_id', $warehouse_id);
        }
        $q = $this->db->get('warehouses_products');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return FALSE;
    }

    public function getCosting($date, $warehouse_id = NULL, $year = NULL, $month = NULL)
    {
        $this->db->select('SUM( COALESCE( purchase_unit_cost, 0 ) * quantity ) AS cost, SUM( COALESCE( sale_unit_price, 0 ) * quantity ) AS sales, SUM( COALESCE( purchase_net_unit_cost, 0 ) * quantity ) AS net_cost, SUM( COALESCE( sale_net_unit_price, 0 ) * quantity ) AS net_sales', FALSE);
        if ($date) {
            $this->db->where('costing.date', $date);
        } elseif ($month) {
            $this->load->helper('date');
            $last_day = days_in_month($month, $year);
            $this->db->where('costing.date >=', $year.'-'.$month.'-01 00:00:00');
            $this->db->where('costing.date <=', $year.'-'.$month.'-'.$last_day.' 23:59:59');
        }

        if ($warehouse_id) {
            $this->db->join('sales', 'sales.id=costing.sale_id')
            ->where('sales.warehouse_id', $warehouse_id);
        }

        $q = $this->db->get('costing');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return false;
    }

    public function getExpenses($date, $warehouse_id = NULL, $year = NULL, $month = NULL)
    {
        $sdate = $date.' 00:00:00';
        $edate = $date.' 23:59:59';
        $this->db->select('SUM( COALESCE( amount, 0 ) ) AS total', FALSE);
        if ($date) {
            $this->db->where('date >=', $sdate)->where('date <=', $edate);
        } elseif ($month) {
            $this->load->helper('date');
            $last_day = days_in_month($month, $year);
            $this->db->where('date >=', $year.'-'.$month.'-01 00:00:00');
            $this->db->where('date <=', $year.'-'.$month.'-'.$last_day.' 23:59:59');
        }
        

        if ($warehouse_id) {
            $this->db->where('warehouse_id', $warehouse_id);
        }

        $q = $this->db->get('expenses');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return false;
    }

    public function getReturns($date, $warehouse_id = NULL, $year = NULL, $month = NULL)
    {
        $sdate = $date.' 00:00:00';
        $edate = $date.' 23:59:59';
        $this->db->select('SUM( COALESCE( grand_total, 0 ) ) AS total', FALSE)
        ->where('sale_status', 'returned');
        if ($date) {
            $this->db->where('date >=', $sdate)->where('date <=', $edate);
        } elseif ($month) {
            $this->load->helper('date');
            $last_day = days_in_month($month, $year);
            $this->db->where('date >=', $year.'-'.$month.'-01 00:00:00');
            $this->db->where('date <=', $year.'-'.$month.'-'.$last_day.' 23:59:59');
        }

        if ($warehouse_id) {
            $this->db->where('warehouse_id', $warehouse_id);
        }

        $q = $this->db->get('sales');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return false;
    }

    public function getOrderDiscount($date, $warehouse_id = NULL, $year = NULL, $month = NULL)
    {
        $sdate = $date.' 00:00:00';
        $edate = $date.' 23:59:59';
        $this->db->select('SUM( COALESCE( order_discount, 0 ) ) AS order_discount', FALSE);
        if ($date) {
            $this->db->where('date >=', $sdate)->where('date <=', $edate);
        } elseif ($month) {
            $this->load->helper('date');
            $last_day = days_in_month($month, $year);
            $this->db->where('date >=', $year.'-'.$month.'-01 00:00:00');
            $this->db->where('date <=', $year.'-'.$month.'-'.$last_day.' 23:59:59');
        }

        if ($warehouse_id) {
            $this->db->where('warehouse_id', $warehouse_id);
        }

        $q = $this->db->get('sales');
        if ($q->num_rows() > 0) {
            return $q->row();
        }
        return false;
    }

    public function getExpenseCategories()
    {
        $q = $this->db->get('expense_categories');
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getDailyPurchases($year, $month, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%e' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
            FROM " . $this->db->dbprefix('purchases') . " WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " DATE_FORMAT( date,  '%Y-%m' ) =  '{$year}-{$month}'
            GROUP BY DATE_FORMAT( date,  '%e' )";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getMonthlyPurchases($year, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%c' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
            FROM " . $this->db->dbprefix('purchases') . " WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " DATE_FORMAT( date,  '%Y' ) =  '{$year}'
            GROUP BY date_format( date, '%c' ) ORDER BY date_format( date, '%c' ) ASC";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getStaffDailyPurchases($user_id, $year, $month, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%e' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
            FROM " . $this->db->dbprefix('purchases')." WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " created_by = {$user_id} AND DATE_FORMAT( date,  '%Y-%m' ) =  '{$year}-{$month}'
            GROUP BY DATE_FORMAT( date,  '%e' )";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getStaffMonthlyPurchases($user_id, $year, $warehouse_id = NULL)
    {
        $myQuery = "SELECT DATE_FORMAT( date,  '%c' ) AS date, SUM( COALESCE( product_tax, 0 ) ) AS tax1, SUM( COALESCE( order_tax, 0 ) ) AS tax2, SUM( COALESCE( grand_total, 0 ) ) AS total, SUM( COALESCE( total_discount, 0 ) ) AS discount, SUM( COALESCE( shipping, 0 ) ) AS shipping
            FROM " . $this->db->dbprefix('purchases') . " WHERE ";
        if ($warehouse_id) {
            $myQuery .= " warehouse_id = {$warehouse_id} AND ";
        }
        $myQuery .= " created_by = {$user_id} AND DATE_FORMAT( date,  '%Y' ) =  '{$year}'
            GROUP BY date_format( date, '%c' ) ORDER BY date_format( date, '%c' ) ASC";
        $q = $this->db->query($myQuery, false);
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

    public function getBestSeller($start_date, $end_date, $warehouse_id = NULL)
    {
        $this->db
            ->select("product_name, product_code")->select_sum('quantity')
            ->join('sales', 'sales.id = sale_items.sale_id', 'left')
            ->where('date >=', $start_date)->where('date <=', $end_date)
            ->group_by('product_name, product_code')->order_by('sum(quantity)', 'desc')->limit(10);
        if ($warehouse_id) {
            $this->db->where('sale_items.warehouse_id', $warehouse_id);
        }
        $q = $this->db->get('sale_items');
        if ($q->num_rows() > 0) {
            foreach (($q->result()) as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return FALSE;
    }

}
