<?php
    session_start();
    require_once '../../../assets/utils/db_auth.php';
    require_once '../../../assets/utils/classes/InvoiceManager.php';

    $inv = new InvoiceManager($pdo2, $company_id);
    $id  = (int)($data['invoice_id'] ?? 0);

    if ($id > 0) {
        $result = $inv->getInvoiceById($id);
        if (!$result) {
            http_response_code(404);
            $answer['message'] = 'Invoice not found.';
            exit(json_encode($answer));
        }
        $answer['output'] = $result;

        // Fetch linked credit notes for invoice detail page
        if ($result['doc_type'] === 'invoice') {
            $answer['credit_notes'] = $inv->getLinkedCreditNotes($id, 'credit_note');
        }

        if ($result['doc_type'] === 'purchase_invoice') {
            $answer['supplier_credit_notes'] = $inv->getLinkedCreditNotes($id, 'supplier_credit_note');
        }
    } else {
        $order_id = (int)($data['order_id'] ?? 0);
        $doc_type = $data['doc_type'] ?? '';
        $answer['output'] = $inv->getInvoiceList($order_id, $doc_type);

        // For credit note / debit note tabs — join ref invoice number
        if ($doc_type === 'credit_note' || $doc_type === 'supplier_credit_note') {
            $answer['output'] = $inv->addReferenceInvoiceNumbers($answer['output']);
        }
    }

    $answer['success'] = 1;
    exit(json_encode($answer));
?>