<?php
class Receiving extends CI_Model
{
	public function get_info($receiving_id)
	{
		$this->db->from('receivings');
		$this->db->join('people', 'people.person_id = receivings.supplier_id', 'LEFT');
		$this->db->where('receiving_id', $receiving_id);

		return $this->db->get();
	}

	/*
	Gets total of invoice rows
	*/
	public function get_invoice_count()
	{
		$this->db->from('receivings');
		$this->db->where('invoice_number IS NOT NULL');

		return $this->db->count_all_results();
	}
	
	public function get_receiving_by_invoice_number($invoice_number)
	{
		$this->db->from('receivings');
		$this->db->where('invoice_number', $invoice_number);

		return $this->db->get();
	}
	
	public function get_invoice_number_for_year($year = '', $start_from = 0)
	{
		$year = $year == '' ? date('Y') : $year;
		$this->db->select('COUNT( 1 ) AS invoice_number_year');
		$this->db->from('receivings');
		$this->db->where('DATE_FORMAT(receiving_time, "%Y" ) = ', $year);
		$this->db->where('invoice_number IS NOT NULL');
		$result = $this->db->get()->row_array();

		return ($start_from + $result['invoice_number_year'] + 1);
	}
	
	public function exists($receiving_id)
	{
		$this->db->from('receivings');
		$this->db->where('receiving_id',$receiving_id);

		return ($this->db->get()->num_rows() == 1);
	}
	
	public function update($receiving_data, $receiving_id)
	{
		$this->db->where('receiving_id', $receiving_id);

		return $this->db->update('receivings', $receiving_data);
	}

	public function save($items, $supplier_id, $employee_id, $comment, $invoice_number, $payment_type, $receiving_id = FALSE)
	{
		if(count($items) == 0)
		{
			return -1;
		}

		$receivings_data = array(
			'supplier_id' => $this->Supplier->exists($supplier_id) ? $supplier_id : null,
			'employee_id' => $employee_id,
			'payment_type' => $payment_type,
			'comment' => $comment,
			'invoice_number' => $invoice_number
		);

		//Run these queries as a transaction, we want to make sure we do all or nothing
		$this->db->trans_start();

		$this->db->insert('receivings', $receivings_data);
		$receiving_id = $this->db->insert_id();

		foreach($items as $line=>$item)
		{
			$cur_item_info = $this->Item->get_info($item['item_id']);

			$receivings_items_data = array(
				'receiving_id'=>$receiving_id,
				'item_id'=>$item['item_id'],
				'line'=>$item['line'],
				'description'=>$item['description'],
				'serialnumber'=>$item['serialnumber'],
				'quantity_purchased'=>$item['quantity'],
				'receiving_quantity'=>$item['receiving_quantity'],
				'discount_percent'=>$item['discount'],
				'item_cost_price' => $cur_item_info->cost_price,
				'item_unit_price'=>$item['price'],
				'item_location'=>$item['item_location']
			);

			$this->db->insert('receivings_items', $receivings_items_data);

			$items_received = $item['receiving_quantity'] != 0 ? $item['quantity'] * $item['receiving_quantity'] : $item['quantity'];

			// update cost price, if changed AND is set in config as wanted
			if($cur_item_info->cost_price != $item['price'] AND	$this->config->item('receiving_calculate_average_price') != FALSE)
			{
				$this->Item->change_cost_price($item['item_id'],
												$items_received,
												$item['price'],
												$cur_item_info->cost_price);
			}

			//Update stock quantity
			$item_quantity = $this->Item_quantity->get_item_quantity($item['item_id'], $item['item_location']);
            $this->Item_quantity->save(array('quantity'=>$item_quantity->quantity + $items_received,
                                              'item_id'=>$item['item_id'],
                                              'location_id'=>$item['item_location']), $item['item_id'], $item['item_location']);

			$recv_remarks ='RECV '.$receiving_id;
			$inv_data = array(
				'trans_date'=>date('Y-m-d H:i:s'),
				'trans_items'=>$item['item_id'],
				'trans_user'=>$employee_id,
				'trans_location'=>$item['item_location'],
				'trans_comment'=>$recv_remarks,
				'trans_inventory'=>$items_received
			);

			$this->Inventory->insert($inv_data);

			$supplier = $this->Supplier->get_info($supplier_id);
		}

		$this->db->trans_complete();
		
		if($this->db->trans_status() === FALSE)
		{
			return -1;
		}

		return $receiving_id;
	}
	
	public function delete_list($receiving_ids, $employee_id, $update_inventory = TRUE)
	{
		$success = TRUE;

		// start a transaction to assure data integrity
		$this->db->trans_start();

		foreach($receiving_ids as $receiving_id)
		{
			$success &= $this->delete($receiving_id, $employee_id, $update_inventory);
		}

		// execute transaction
		$this->db->trans_complete();

		$success &= $this->db->trans_status();

		return $success;
	}
	
	public function delete($receiving_id, $employee_id, $update_inventory = TRUE)
	{
		// start a transaction to assure data integrity
		$this->db->trans_start();

		if($update_inventory)
		{
			// defect, not all item deletions will be undone??
			// get array with all the items involved in the sale to update the inventory tracking
			$items = $this->get_receiving_items($receiving_id)->result_array();
			foreach($items as $item)
			{
				// create query to update inventory tracking
				$inv_data = array(
						'trans_date'=>date('Y-m-d H:i:s'),
						'trans_items'=>$item['item_id'],
						'trans_user'=>$employee_id,
						'trans_comment'=>'Deleting receiving ' . $receiving_id,
						'trans_location'=>$item['item_location'],
						'trans_inventory'=>$item['quantity_purchased']*-1
				);
				// update inventory
				$this->Inventory->insert($inv_data);

				// update quantities
				$this->Item_quantity->change_quantity($item['item_id'],
														$item['item_location'],
														$item['quantity_purchased']*-1);
			}
		}

		// delete all items
		$this->db->delete('receivings_items', array('receiving_id' => $receiving_id));
		// delete sale itself
		$this->db->delete('receivings', array('receiving_id' => $receiving_id));

		// execute transaction
		$this->db->trans_complete();
	
		return $this->db->trans_status();
	}

	public function get_receiving_items($receiving_id)
	{
		$this->db->from('receivings_items');
		$this->db->where('receiving_id', $receiving_id);

		return $this->db->get();
	}
	
	public function get_supplier($receiving_id)
	{
		$this->db->from('receivings');
		$this->db->where('receiving_id', $receiving_id);

		return $this->Supplier->get_info($this->db->get()->row()->supplier_id);
	}
	
	public function invoice_number_exists($invoice_number, $receiving_id = '')
	{
		$this->db->from('receivings');
		$this->db->where('invoice_number', $invoice_number);
		if(!empty($receiving_id))
		{
			$this->db->where('receiving_id !=', $receiving_id);
		}
		$query = $this->db->get();

		return ($query->num_rows() == 1);
	}
	
	/*
	We create a temp table that allows us to do easy report/receiving queries
	*/
	public function create_receivings_items_temp_table()
	{
		$this->db->query("CREATE TEMPORARY TABLE IF NOT EXISTS " . $this->db->dbprefix('receivings_items_temp') . "
			(SELECT 
				date(receiving_time) AS receiving_date,
				" . $this->db->dbprefix('receivings_items') . " . receiving_id,
				comment,
				item_location,
				invoice_number,
				payment_type,
				employee_id, 
				" . $this->db->dbprefix('items') . " . item_id,
				" . $this->db->dbprefix('receivings') . " . supplier_id,
				quantity_purchased,
				" . $this->db->dbprefix('receivings_items') . " . receiving_quantity,
				item_cost_price,
				item_unit_price,
				discount_percent,
				(item_unit_price * quantity_purchased - item_unit_price * quantity_purchased * discount_percent / 100) AS subtotal,
				" . $this->db->dbprefix('receivings_items') . " . line AS line,
				serialnumber,
				" . $this->db->dbprefix('receivings_items') . " . description AS description,
				(item_unit_price * quantity_purchased - item_unit_price * quantity_purchased * discount_percent / 100) AS total,
				(item_unit_price * quantity_purchased - item_unit_price * quantity_purchased * discount_percent / 100) - (item_cost_price * quantity_purchased) AS profit,
				(item_cost_price * quantity_purchased) AS cost
			FROM " . $this->db->dbprefix('receivings_items') . "
			INNER JOIN " . $this->db->dbprefix('receivings') . " ON " . $this->db->dbprefix('receivings_items') . '.receiving_id=' . $this->db->dbprefix('receivings') . '.receiving_id' . "
			INNER JOIN " . $this->db->dbprefix('items') . " ON " . $this->db->dbprefix('receivings_items') . '.item_id=' . $this->db->dbprefix('items') . '.item_id' . "
			GROUP BY receiving_id, item_id, line)"
		);
	}
}
?>