<?php
// Call the Go PDF generation endpoint instead of using TCPDF
// Use environment variable for Go service URL, default to Docker DNS name and port
$goHost = getenv('GO_APP_HOST') ?: 'cmc-go:8080';
$goApiUrl = 'http://' . $goHost . '/go/pdf/generate-invoice';

// Prepare invoice data for Go API
$billTo = isset($document['Document']['bill_to']) ? $document['Document']['bill_to'] : '';
$shipTo = isset($document['Document']['ship_to']) ? $document['Document']['ship_to'] : '';
$shippingDetails = isset($document['Document']['shipping_details']) ? $document['Document']['shipping_details'] : 'TBA';
$customerOrderNumber = isset($document['Document']['customer_order_number']) ? $document['Document']['customer_order_number'] : '';
$paymentTerms = isset($document['Document']['payment_terms']) ? $document['Document']['payment_terms'] : '';
$customerABN = isset($document['Document']['customer_abn']) ? $document['Document']['customer_abn'] : '';

// Calculate totals
$totals = $this->requestAction('/documents/calculateInvoiceTotals/'.$document['Document']['id']);
$subtotal = isset($totals['subtotal']) ? $totals['subtotal'] : 0;
$gstAmount = isset($totals['gst']) ? $totals['gst'] : 0;
$total = isset($totals['total']) ? $totals['total'] : 0;

// Prepare line items
$lineItems = array();
foreach ($document['LineItem'] as $item) {
    $lineItems[] = array(
        'item_number' => $item['item_number'],
        'quantity' => $item['quantity'],
        'title' => $item['title'],
        'description' => isset($item['description']) ? $item['description'] : '',
        'unit_price' => isset($item['unit_price_string']) ? floatval($item['unit_price_string']) : 0,
        'total_price' => isset($item['gross_price_string']) ? floatval($item['gross_price_string']) : 0
    );
}

$invoicePayload = array(
    'document_id' => $document['Document']['id'],
    'invoice_title' => $document['Invoice']['title'],
    'customer_name' => $document['Customer']['name'],
    'contact_email' => isset($document['Contact']['email']) ? $document['Contact']['email'] : '',
    'contact_name' => isset($document['Contact']['first_name']) ? $document['Contact']['first_name'] . ' ' . $document['Contact']['last_name'] : '',
    'user_first_name' => isset($user['User']['first_name']) ? $user['User']['first_name'] : '',
    'user_last_name' => isset($user['User']['last_name']) ? $user['User']['last_name'] : '',
    'user_email' => isset($user['User']['email']) ? $user['User']['email'] : '',
    'your_reference' => isset($document['Document']['your_reference']) ? $document['Document']['your_reference'] : '',
    'ship_via' => isset($ship_via) ? $ship_via : '',
    'fob' => isset($fob) ? $fob : '',
    'issue_date' => $document['Invoice']['issue_date'],
    'issue_date_string' => isset($issue_date_string) ? $issue_date_string : date('d F Y', strtotime($document['Invoice']['issue_date'])),
    'currency_symbol' => isset($document['Currency']['symbol']) ? $document['Currency']['symbol'] : '$',
    'currency_code' => isset($document['Currency']['code']) ? $document['Currency']['code'] : 'AUD',
    'show_gst' => $document['Invoice']['gst'],
    'bill_to' => $billTo,
    'ship_to' => $shipTo,
    'shipping_details' => $shippingDetails,
    'customer_order_number' => $customerOrderNumber,
    'job_title' => isset($job['Job']['title']) ? $job['Job']['title'] : '',
    'payment_terms' => $paymentTerms,
    'customer_abn' => $customerABN,
    'subtotal' => $subtotal,
    'gst_amount' => $gstAmount,
    'total' => $total,
    'line_items' => $lineItems,
    'output_dir' => '../php/app/webroot/pdf'
);

// Call Go API
$ch = curl_init($goApiUrl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($invoicePayload));
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);

$response = curl_exec($ch);
$curlError = curl_error($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($httpCode === 200) {
    $result = json_decode($response, true);
    if (isset($result['filename'])) {
        echo "<script type=\"text/javascript\">
            window.location.replace(\"/documents/view/{$document['Document']['id']}\");
        </script>";
    } else {
        echo "Error: Invalid response from PDF generator";
    }
} else {
    echo "Error: PDF generation failed (HTTP {$httpCode})<br>";
    echo "API URL: " . htmlspecialchars($goApiUrl) . "<br>";
    if (!empty($curlError)) {
        echo "Curl Error: " . htmlspecialchars($curlError) . "<br>";
    }
    if (!empty($response)) {
        echo "<pre>" . htmlspecialchars($response) . "</pre>";
    }
}
?>