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

require_once("Report.php");

abstract class Summary_report extends Report
{
    /**
     * Private interface
     */

    private function _common_select(array $inputs)
    {
        $where = '';

        if(empty($this->config->item('date_or_time_format')))
        {
            $where .= 'DATE(sale_time) BETWEEN ' . $this->db->escape($inputs['start_date']) . ' AND ' . $this->db->escape($inputs['end_date']);
        }
        else
        {
            $where .= 'sale_time BETWEEN ' . $this->db->escape(rawurldecode($inputs['start_date'])) . ' AND ' . $this->db->escape(rawurldecode($inputs['end_date']));
        }

        $decimals = totals_decimals();

        $sale_price = 'sales_items.item_unit_price * sales_items.quantity_purchased * (1 - sales_items.discount_percent / 100)';
        $sale_cost = 'ROUND(IFNULL(SUM(sales_items.item_cost_price * sales_items.quantity_purchased), 0), ' . $decimals . ')';
        $tax = 'ROUND(IFNULL(SUM(sales_items_taxes.tax), 0), ' . $decimals . ')';

        if($this->config->item('tax_included'))
        {
            $sale_total = 'ROUND(SUM(' . $sale_price . '),' . $decimals . ')';
            $sale_subtotal = $sale_total . ' - ' . $tax;
        }
        else
        {
            $sale_subtotal = 'ROUND(SUM(' . $sale_price . '),' . $decimals . ')';
            $sale_total = $sale_subtotal . ' + ' . $tax;
        }

        // create a temporary table to contain all the sum of taxes per sale item
        $this->db->query('CREATE TEMPORARY TABLE IF NOT EXISTS ' . $this->db->dbprefix('sales_items_taxes_temp') .
            ' (INDEX(sale_id), INDEX(item_id))
            (
                SELECT sales_items_taxes.sale_id AS sale_id,
                    sales_items_taxes.item_id AS item_id,
                    sales_items_taxes.line AS line,
                    SUM(sales_items_taxes.item_tax_amount) AS tax
                FROM ' . $this->db->dbprefix('sales_items_taxes') . ' AS sales_items_taxes
                INNER JOIN ' . $this->db->dbprefix('sales') . ' AS sales
                    ON sales.sale_id = sales_items_taxes.sale_id
                INNER JOIN ' . $this->db->dbprefix('sales_items') . ' AS sales_items
                    ON sales_items.sale_id = sales_items_taxes.sale_id AND sales_items.line = sales_items_taxes.line
                WHERE sale_status = 0 AND ' . $where . '
                GROUP BY sale_id, item_id, line
            )'
        );

        $this->db->select("
                IFNULL($sale_subtotal, $sale_total) AS subtotal,
                $tax AS tax,
                IFNULL($sale_total, $sale_subtotal) AS total,
                $sale_cost AS cost,
                (IFNULL($sale_subtotal, $sale_total) - $sale_cost) AS profit
        ");
    }

    private function _common_from()
    {
        $this->db->from('sales_items AS sales_items');
        $this->db->join('sales AS sales', 'sales_items.sale_id = sales.sale_id', 'inner');
        $this->db->join('sales_items_taxes_temp AS sales_items_taxes',
            'sales_items.sale_id = sales_items_taxes.sale_id AND sales_items.item_id = sales_items_taxes.item_id AND sales_items.line = sales_items_taxes.line',
            'left outer');
    }

    private function _common_where(array $inputs)
    {
        if(empty($this->config->item('date_or_time_format')))
        {
            $this->db->where('DATE(sales.sale_time) BETWEEN ' . $this->db->escape($inputs['start_date']) . ' AND ' . $this->db->escape($inputs['end_date']));
        }
        else
        {
            $this->db->where('sales.sale_time BETWEEN ' . $this->db->escape(rawurldecode($inputs['start_date'])) . ' AND ' . $this->db->escape(rawurldecode($inputs['end_date'])));
        }

        if($inputs['location_id'] != 'all')
        {
            $this->db->where('sales_items.item_location', $inputs['location_id']);
        }

        if($inputs['sale_type'] == 'sales')
        {
            $this->db->where('sales_items.quantity_purchased >= 0');
        }
        elseif($inputs['sale_type'] == 'returns')
        {
            $this->db->where('sales_items.quantity_purchased < 0');
        }
    }

    /**
     * Protected class interface implemented by derived classes
     */

    abstract protected function _get_data_columns();

    protected function _select(array $inputs)   { $this->_common_select($inputs); }
    protected function _from()                  { $this->_common_from(); }
    protected function _where(array $inputs)    { $this->_common_where($inputs); }
    protected function _group_order()           {}

    /**
     * Public interface implementing the base abstract class, in general it should not be extended unless there is a valid reason
    */

    public function getDataColumns()
    {
        return $this->_get_data_columns();
    }

    public function getData(array $inputs)
    {
        $this->_select($inputs);

        $this->_from();

        $this->_where($inputs);

        $this->_group_order();

        return $this->db->get()->result_array();
    }

    public function getSummaryData(array $inputs)
    {
        $this->_common_select($inputs);

        $this->_common_from();

        $this->_where($inputs);

        return $this->db->get()->row_array();
    }
}
?>