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

require_once("Report.php");

abstract class Summary_report extends Report
{
    function __construct()
    {
        parent::__construct();
    }

    /*

    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']));
        }

        $sale_price = 'sales_items.item_unit_price * sales_items.quantity_purchased * (1 - sales_items.discount_percent / 100)';

        if($this->config->item('tax_included'))
        {
            $sale_total = 'SUM(' . $sale_price . ')';
            $sale_subtotal = 'SUM(' . $sale_price . ' - sales_items_taxes.tax)';
            $sale_tax = 'SUM(' . $sale_price . ' * (1 - 100 / (100 + sales_items_taxes.percent)))';
        }
        else
        {
            $sale_total = 'SUM(' . $sale_price . ' + sales_items_taxes.tax)';
            $sale_subtotal = 'SUM(' . $sale_price . ')';
            $sale_tax = 'SUM(' . $sale_price . ' * (sales_items_taxes.percent / 100))';
        }

        $sale_cost = 'SUM(sales_items.item_cost_price * sales_items.quantity_purchased)';

        $decimals = totals_decimals();

        // create a temporary table to contain all the sum of taxes per sale item
        $this->db->query('CREATE TEMPORARY TABLE IF NOT EXISTS ' . $this->db->dbprefix('sales_items_taxes_temp') .
            ' (INDEX(sale_id), INDEX(item_id))
            (
                SELECT sales_items_taxes.sale_id AS sale_id,
                    sales_items_taxes.item_id AS item_id,
                    sales_items_taxes.line AS line,
                    ' . "
                    IFNULL(ROUND($sale_tax, $decimals), 0) 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
            )'
        );

        $this->db->select("
                IFNULL(ROUND($sale_subtotal, $decimals), ROUND($sale_total - IFNULL(SUM(sales_items_taxes.tax), 0), $decimals)) AS subtotal,
                IFNULL(ROUND(SUM(sales_items_taxes.tax), $decimals), 0) AS tax,
                IFNULL(ROUND($sale_total, $decimals), ROUND($sale_subtotal, $decimals)) AS total,
                IFNULL(ROUND($sale_cost, $decimals), 0) AS cost,
                IFNULL(ROUND($sale_total - IFNULL(SUM(sales_items_taxes.tax), 0) - $sale_cost, $decimals), ROUND($sale_subtotal - $sale_cost, $decimals)) 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();
    }
}
?>