<?php
require_once __DIR__ . '/../../../session.php';
require_once '../../../assets/utils/db_auth.php';
require_once '../../../assets/utils/classes/OrderManager.php';
require_once '../../../assets/utils/classes/QuotationManager.php';

require_role($user_role, ['owner', 'admin', 'staff']);

$quotation_id  = (int)($data['quotation_id'] ?? 0);
$convert_items = $data['convert_items'] ?? [];

if (!$quotation_id) {
    http_response_code(400);
    $answer['message'] = 'Quotation ID required.';
    exit(json_encode($answer));
}

$qm = new QuotationManager($pdo2, $company_id);

// Load quotation — must be Accepted
$q = $qm->getById($quotation_id);
if (!$q || (int)$q['status'] !== 2) {
    http_response_code(400);
    $answer['message'] = 'Quotation not found or not in Accepted status.';
    exit(json_encode($answer));
}

$qt_items = $q['items'];
if (empty($qt_items)) {
    http_response_code(400);
    $answer['message'] = 'Quotation has no items.';
    exit(json_encode($answer));
}

if ((float)$q['total_remaining'] <= 0.000001) {
    http_response_code(400);
    $answer['message'] = 'Quotation is already fully converted.';
    exit(json_encode($answer));
}

// Index by item_id for validation
$qt_by_id = [];
foreach ($qt_items as $qi) {
    $qt_by_id[(int)$qi['item_id']] = $qi;
}

// Default to all remaining when caller sends no selection
if (empty($convert_items)) {
    $convert_items = [];
    foreach ($qt_items as $qi) {
        $remaining = (float)$qi['remaining_qty'];
        if ($remaining > 0.000001) {
            $convert_items[] = ['item_id' => (int)$qi['item_id'], 'quantity' => $remaining];
        }
    }
}

// Validate quantities and build order items
$ord_items = [];
$validated = [];

foreach ($convert_items as $ci) {
    $item_id = (int)($ci['item_id'] ?? 0);
    $qty     = (float)($ci['quantity'] ?? 0);

    if ($qty <= 0) continue;
    if (!isset($qt_by_id[$item_id])) {
        http_response_code(400);
        $answer['message'] = "Item #{$item_id} not found in this quotation.";
        exit(json_encode($answer));
    }

    $qi        = $qt_by_id[$item_id];
    $remaining = (float)$qi['remaining_qty'];

    if ($qty - $remaining > 0.000001) {
        $name = $qi['product_name'] ?: $qi['product_sku'];
        http_response_code(400);
        $answer['message'] = "Cannot convert {$qty} for \"{$name}\": only {$remaining} remaining.";
        exit(json_encode($answer));
    }

    $unit_price  = (float)$qi['unit_price'];
    $total_price = round($qty * $unit_price, 4);
    $tax_amount  = round($total_price * (float)($qi['tax_amount'] / max((float)$qi['total_price'], 0.000001)), 4);

    $ord_items[] = [
        'item_id'      => $item_id - 1,
        'product_sku'  => $qi['product_sku'],
        'product_name' => $qi['product_name'],
        'warehouse_id' => 0,
        'lot_number'   => '',
        'quantity'     => $qty,
        'unit_price'   => $unit_price,
        'total_price'  => $total_price,
        'tax_amount'   => $tax_amount,
        'tax_rate'     => (float)($qi['tax_rate'] ?? 0),
        'stock_out_id' => 0,
    ];
    $validated[] = ['item_id' => $item_id, 'quantity' => $qty];
}

if (empty($ord_items)) {
    http_response_code(400);
    $answer['message'] = 'No valid items to convert.';
    exit(json_encode($answer));
}

$order_data = [
    'source'       => 'quotation',
    'source_id'    => $quotation_id,
    'contact_id'   => (int)$q['contact_id'],
    'department_id'=> (int)($q['department_id'] ?? 0),
    'order_date'   => date('Y-m-d'),
    'items'        => $ord_items,
    'discount'     => 0,
    'shipping_fee' => 0,
    'shipping_tracking_number' => '',
    'notes'        => $q['notes'] ?? '',
];

try {
    $new_order_id = null;

    dbTransaction($pdo2, function($pdo) use (
        $order_data, $company_id, $logging, $quotation_id, $validated, $qm, &$new_order_id
    ) {
        $om           = new OrderManager($pdo, $company_id);
        $new_order_id = $om->saveOrder($order_data, $logging);

        $qm2 = new QuotationManager($pdo, $company_id);
        $qm2->incrementConvertedQty($quotation_id, $validated);
    });

    $answer['success']  = 1;
    $answer['message']  = 'Order created successfully.';
    $answer['order_id'] = $new_order_id;

} catch (PDOException $e) {
    $answer['message'] = 'Database error, please try again.';
    http_response_code(500);
} catch (Exception $e) {
    $answer['message'] = $e->getMessage();
    http_response_code(400);
}

exit(json_encode($answer));