opensourcepos/app/Models/Reports/Inventory_summary.php

<?php

namespace App\Models\Reports;

use App\Models\Item;

/**
 *
 *
 * @property item item
 *
 */
class Inventory_summary extends Report
{
	/**
	 * @return array[]
	 */
	public function getDataColumns(): array
	{
		return [
			['item_name' => lang('Reports.item_name')],
			['item_number' => lang('Reports.item_number')],
			['category' => lang('Reports.category')],
			['quantity' => lang('Reports.quantity')],
			['low_sell_quantity' => lang('Reports.low_sell_quantity')],
			['reorder_level' => lang('Reports.reorder_level')],
			['location_name' => lang('Reports.stock_location')],
			['cost_price' => lang('Reports.cost_price'), 'sorter' => 'number_sorter'],
			['unit_price' => lang('Reports.unit_price'), 'sorter' => 'number_sorter'],
			['subtotal' => lang('Reports.sub_total_value'), 'sorter' => 'number_sorter']
		];
	}

	/**
	 * @param array $inputs
	 * @return array
	 */
	public function getData(array $inputs): array
	{
		$item = model(Item::class);

		$builder = $this->db->table('items AS items');
		$builder->select($item->get_item_name('name') . ',
			items.item_number,
			items.category,
			item_quantities.quantity,
			(item_quantities.quantity * items.qty_per_pack) as low_sell_quantity,
			items.reorder_level,
			stock_locations.location_name,
			items.cost_price,
			items.unit_price,
			(items.cost_price * item_quantities.quantity) AS sub_total_value'
		);
		$builder->join('item_quantities AS item_quantities', 'items.item_id = item_quantities.item_id');
		$builder->join('stock_locations AS stock_locations', 'item_quantities.location_id = stock_locations.location_id');
		$builder->where('items.deleted', 0);
		$builder->where('items.stock_type', 0);
		$builder->where('stock_locations.deleted', 0);

		// should be corresponding to the values Inventory_summary::getItemCountDropdownArray() returns...
		if($inputs['item_count'] == 'zero_and_less')
		{
			$builder->where('item_quantities.quantity <=', 0);
		}
		elseif($inputs['item_count'] == 'more_than_zero')
		{
			$builder->where('item_quantities.quantity >', 0);
		}

		if($inputs['location_id'] != 'all')
		{
			$builder->where('stock_locations.location_id', $inputs['location_id']);
		}

        $builder->orderBy('items.name');
		$builder->orderBy('items.qty_per_pack');

		return $builder->get()->getResultArray();
	}

	/**
	 * calculates the total value of the given inventory summary by summing all sub_total_values (see Inventory_summary::getData())
	 *
	 * @param array $inputs expects the reports-data-array which Inventory_summary::getData() returns
	 *
	 * @return array
	 */
	public function getSummaryData(array $inputs): array
	{
		$return = [	//TODO: This variable name should be refactored to reflect what it is... perhaps summary_data
			'total_inventory_value' => 0,
			'total_quantity' => 0,
			'total_low_sell_quantity' => 0,
			'total_retail' => 0
		];

		foreach($inputs as $input)
		{
			$return['total_inventory_value'] += $input['sub_total_value'];
			$return['total_quantity'] += $input['quantity'];
			$return['total_low_sell_quantity'] += $input['low_sell_quantity'];
			$return['total_retail'] += $input['unit_price'] * $input['quantity'];
		}

		return $return;
	}

	/**
	 * returns the array for the dropdown-element item-count in the form for the inventory summary-report
	 *
	 * @return array
	 */
	public function getItemCountDropdownArray(): array
	{
		return [
			'all' => lang('Reports.all'),
			'zero_and_less' => lang('Reports.zero_and_less'),
			'more_than_zero' => lang('Reports.more_than_zero')
		];
	}
}