<?php
/**********************************************************************
    Copyright (C) FrontAccounting, LLC.
	Released under the terms of the GNU General Public License, GPL, 
	as published by the Free Software Foundation, either version 3 
	of the License, or (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
    See the License here <http://www.gnu.org/licenses/gpl-3.0.html>.
***********************************************************************/
include_once($path_to_root . "/purchasing/includes/supp_trans_class.inc");

include_once($path_to_root . "/includes/banking.inc");
include_once($path_to_root . "/includes/inventory.inc");

include_once($path_to_root . "/includes/date_functions.inc");

include_once($path_to_root . "/includes/db/allocations_db.inc");

include_once($path_to_root . "/purchasing/includes/db/supp_trans_db.inc");
include_once($path_to_root . "/purchasing/includes/db/po_db.inc");
include_once($path_to_root . "/purchasing/includes/db/grn_db.inc");
include_once($path_to_root . "/purchasing/includes/db/invoice_db.inc");
include_once($path_to_root . "/purchasing/includes/db/suppalloc_db.inc");
include_once($path_to_root . "/purchasing/includes/db/supp_payment_db.inc");
include_once($path_to_root . "/purchasing/includes/db/suppliers_db.inc");

//-------------------------------------------------------------------------------------------------------------

// add a supplier-related gl transaction
// $date_ is display date (non-sql)
// $amount is in SUPPLIERS'S currency

function add_gl_trans_supplier($type, $type_no, $date_, $account, $dimension, $dimension2,  
	$amount, $supplier_id, $rate=0, $memo="")
{
	return add_gl_trans($type, $type_no, $date_, $account, $dimension, $dimension2, $memo, 
		$amount, get_supplier_currency($supplier_id), 
		PT_SUPPLIER, $supplier_id, $rate);
}

//----------------------------------------------------------------------------------------

function get_purchase_price($supplier_id, $stock_id)
{
	$sql = "SELECT price, conversion_factor FROM ".TB_PREF."purch_data 
		WHERE supplier_id = ".db_escape($supplier_id) . " 
		AND stock_id = ".db_escape($stock_id);
	$result = db_query($sql, "The supplier pricing details for " . $stock_id . " could not be retrieved");    

	if (db_num_rows($result) == 1)
	{
		$myrow = db_fetch($result);
		return $myrow["price"] / $myrow['conversion_factor'];
	} 
	else 
	{
		return 0;
	}	
}

function get_purchase_conversion_factor($supplier_id, $stock_id)
{
	$sql = "SELECT conversion_factor FROM ".TB_PREF."purch_data 
		WHERE supplier_id = ".db_escape($supplier_id)." 
		AND stock_id = ".db_escape($stock_id);
	$result = db_query($sql, "The supplier pricing details for " . $stock_id . " could not be retrieved");    

	if (db_num_rows($result) == 1)
	{
		$myrow = db_fetch($result);
		return $myrow['conversion_factor'];
	} 
	else 
	{
		return 1;
	}	
}
//----------------------------------------------------------------------------------------

function get_purchase_data($supplier_id, $stock_id)
{
	$sql = "SELECT * FROM ".TB_PREF."purch_data 
		WHERE supplier_id = ".db_escape($supplier_id) . "
		AND stock_id = ".db_escape($stock_id);
	$result = db_query($sql, "The supplier pricing details for " . $stock_id . " could not be retrieved");    

	return db_fetch($result);
}

function add_or_update_purchase_data($supplier_id, $stock_id, $price, $description="", $uom="")
{
	$data = get_purchase_data($supplier_id, $stock_id);
	if ($data === false)
	{
		$sql = "INSERT INTO ".TB_PREF."purch_data (supplier_id, stock_id, price, suppliers_uom,
			conversion_factor, supplier_description) VALUES (".db_escape($supplier_id)
			.", ".db_escape($stock_id).", ".db_escape($price).", "
			.db_escape($uom).", 1, ".db_escape($description).")";
		db_query($sql,"The supplier purchasing details could not be added");
		return;
	}	
	$price = round($price * $data['conversion_factor'], user_price_dec());
	$sql = "UPDATE ".TB_PREF."purch_data SET price=".db_escape($price);
	if ($uom != "")
		$sql .= ",suppliers_uom=".db_escape($uom);
	if ($description != "")	
		$sql .= ",supplier_description=".db_escape($description);
	$sql .= " WHERE stock_id=".db_escape($stock_id)." AND supplier_id=".db_escape($supplier_id);
	db_query($sql,"The supplier purchasing details could not be updated");
	return true;
}

function get_po_prepayments($supp_trans)
{
	// collect purchase order line ids
	$allocations = array();
	$line_ids = array();
	foreach($supp_trans->grn_items as $item)
		if ($item->po_detail_item)
			$line_ids[] = $item->po_detail_item;

	if (!count($line_ids))
		return $allocations;

	$sql = "SELECT DISTINCT allocs.*
		FROM ".TB_PREF."supp_allocations allocs 
			LEFT JOIN ".TB_PREF."purch_order_details line ON line.order_no=allocs.trans_no_to AND trans_type_to=".ST_PURCHORDER."
		WHERE line.po_detail_item IN(".implode(',', array_values($line_ids)).")";

	$result = db_query($sql, "Cannot retrieve po prepayments");

	while($dat = db_fetch($result))
	{
		$allocations[] = $dat;
	}

	return $allocations;
}


//------------------------------------ Backend interfaces--------------------------------------------

//---------------------------------------------------------------------------------------------------
//
//	Add Purchase Order, GRN or Purchase Invoice with parent auto documents (if any)
//
function add_direct_supp_trans($cart)
{
	global $Refs, $type_shortcuts;

	begin_transaction(__FUNCTION__, func_get_args());

	if ($cart->trans_type != ST_PURCHORDER) {
		// for direct grn/invoice set same dates for lines as for whole document
		foreach ($cart->line_items as $line_no =>$line)
			$cart->line_items[$line_no]->req_del_date = $cart->tran_date;
	}

	$ref = $cart->reference;
	if ($cart->trans_type != ST_PURCHORDER) {
		$cart->reference = 'auto';
	}
	$order_no = add_po($cart);
   	$cart->order_no = $order_no;

	if ($cart->trans_type == ST_PURCHORDER) {
		commit_transaction();
		return $order_no;
	}

	//Direct GRN
	if ($cart->trans_type == ST_SUPPRECEIVE)
		$cart->reference = $ref;
	if ($cart->trans_type != ST_SUPPINVOICE)
		$cart->Comments = $cart->reference; //grn does not hold supp_ref

	$grn_no = write_grn($cart);
	if ($cart->trans_type == ST_SUPPRECEIVE) {
		commit_transaction(); // save PO+GRN
		return $grn_no;
	}
	//	Direct Purchase Invoice
	$inv = new supp_trans(ST_SUPPINVOICE);
	$inv->Comments = $cart->Comments;
	$inv->supplier_id = $cart->supplier_id;
	$inv->tran_date = $cart->tran_date;
	$inv->due_date = $cart->due_date;
	$inv->dimension = $cart->dimension;
	$inv->dimension2 = $cart->dimension2;
	$inv->reference = $ref;
	$inv->supp_reference = $cart->supp_ref;
	$inv->tax_included = $cart->tax_included;
	$supp = get_supplier($cart->supplier_id);
	$inv->tax_group_id = $supp['tax_group_id'];
	$inv->ov_amount = $inv->ov_gst = $inv->ov_discount = 0;
	$total = 0;
		foreach($cart->line_items as $key => $line) {
		$inv->add_grn_to_trans($line->grn_item_id, $line->po_item_id, $line->stock_id,
			$line->item_description, $line->quantity, 0, $line->quantity,
			$line->price, $line->price, true, get_unit_cost($line->stock_id), '');

		$total += round2(($line->quantity * $line->price), user_price_dec());
	}
	$inv->tax_overrides = $cart->tax_overrides;
	if (!$inv->tax_included) {
		$taxes = $inv->get_taxes();
		foreach( $taxes as $taxitem) {
			$total += isset($taxitem['Override']) ? $taxitem['Override'] : $taxitem['Value'];
		}
	}
	$inv->ex_rate = $cart->ex_rate;

	$inv_no = add_supp_invoice($inv);

	if ($cart->cash_account) {
		$pmt_no = write_supp_payment(0, $inv->supplier_id, $cart->cash_account,	$inv->tran_date, $Refs->get_next(ST_SUPPAYMENT, null, $inv->tran_date), 
			$total, 0, _('Payment for:').$inv->supp_reference .' ('.$type_shortcuts[ST_SUPPINVOICE].$inv_no.')');
		add_supp_allocation($total, ST_SUPPAYMENT, $pmt_no, ST_SUPPINVOICE, $inv_no, $inv->supplier_id, $inv->tran_date);
		update_supp_trans_allocation(ST_SUPPINVOICE, $inv_no, $inv->supplier_id);
		update_supp_trans_allocation(ST_SUPPAYMENT, $pmt_no, $inv->supplier_id);
	}
	commit_transaction(); // save PO+GRN+PI(+SP)
	return $inv_no;
}

function write_supplier($supplier_id, $supp_name, $ref, $address, $supp_address, $gst_no,
				$website, $supp_account_no, $bank_account, $credit_limit = 0, $dim1, $dim2, $curr_code,
				$payment_terms, $payable_account, $purchase_account, $payment_discount_account,
				$notes, $tax_group_id, $tax_included, $contact, $phone, $phone2, $fax, $email, $lang, $inactive=null)
{
		begin_transaction(__FUNCTION__, func_get_args());
		if ($supplier_id) {
			update_supplier($supplier_id, $supp_name, $ref, $address, $supp_address, $gst_no,
					$website, $supp_account_no, $bank_account, $credit_limit = 0, $dim1, $dim2, $curr_code,
					$payment_terms, $payable_account, $purchase_account, $payment_discount_account,
					$notes, $tax_group_id, $tax_included);

			if ( isset($inactive) )
				update_record_status($supplier_id, $inactive, 'suppliers', 'supplier_id');
		} else {
			add_supplier($supp_name, $ref, $address, $supp_address, $gst_no,
					$website, $supp_account_no, $bank_account, $credit_limit = 0, $dim1, $dim2, $curr_code,
					$payment_terms, $payable_account, $purchase_account, $payment_discount_account,
					$notes, $tax_group_id, $tax_included);
			$supplier_id = db_insert_id();

			add_crm_person($ref, $contact, '', $address, $phone, $phone2, $fax, $email, $lang, '');

			add_crm_contact('supplier', 'general', $supplier_id, db_insert_id());
		}
		commit_transaction();
		return $supplier_id;
}

function write_supp_allocation($cart)
{
	begin_transaction(__FUNCTION__, func_get_args());
		$result = $cart->write();
	commit_transaction();
	return $result;
}

function save_supp_payment($cart, $supplier_id, $bank_account, $trans_date, $ref, $amount, $memo, $charge, $bank_amount)
{
	begin_transaction(__FUNCTION__, func_get_args());

	$discount = 0;
	foreach($cart->allocs as $alloc)
		if ($alloc->discount_confirmed)
			$discount += $alloc->early_discount*$alloc->amount;

	$payment_no = write_supp_payment($cart->trans_no, $supplier_id, $bank_account, $trans_date, $ref, $amount,
		$discount, $memo, $charge, $bank_amount);

	$cart->trans_no = $payment_no;
	$cart->date_ = $trans_date;
	$cart->write();

	commit_transaction();

	return $payment_no;
}