<?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();
	}
}
?>