<?php
/**
 * View Invoice Details Endpoint (with Line Items)
 */

use App\Core\Database;
use App\Core\Encryption;
use App\Middleware\AuthMiddleware;

// 1. Auth Check
$decoded = AuthMiddleware::check();
$db = Database::getInstance();

$id = input('id');
if (!$id) {
    json_error('Invoice ID is required', 422);
}

try {
    // 2. Fetch Invoice
    $stmt = $db->prepare("
        SELECT i.*, c.name as company_name
        FROM invoices i
        LEFT JOIN companies c ON i.company_id = c.id
        WHERE i.id = ?
    ");
    $stmt->execute([$id]);
    $invoice = $stmt->fetch();

    if (!$invoice) {
        json_error('Invoice not found', 404);
    }

    // 3. Authorization Check
    if ($decoded['role'] !== 'super_admin') {
        if ($invoice['tenant_id'] !== $decoded['tenant_id']) {
            json_error('Unauthorized access to this invoice', 403);
        }
    }

    // 4. Fetch Line Items
    $stmtLines = $db->prepare("SELECT * FROM invoice_lines WHERE invoice_id = ? ORDER BY line_number ASC");
    $stmtLines->execute([$id]);
    $invoice['items'] = $stmtLines->fetchAll();

    // 5. Decrypt Fields (Robustly)
    $decrypt = fn($val) => Encryption::decrypt($val ?? '') ?: $val;

    $invoice['supplier_tin'] = $decrypt($invoice['supplier_tin']);
    $invoice['supplier_name'] = $decrypt($invoice['supplier_name']);
    $invoice['supplier_address'] = $decrypt($invoice['supplier_address']);
    $invoice['buyer_tin'] = $decrypt($invoice['buyer_tin']);
    $invoice['buyer_name'] = $decrypt($invoice['buyer_name']);
    $invoice['buyer_national_id'] = $decrypt($invoice['buyer_national_id']);
    
    if (!empty($invoice['company_name'])) {
        $invoice['company_name'] = $decrypt($invoice['company_name']);
    }

    // 6. Generate Public URL for File (Assuming storage is symlinked or served)
    // For now, let's just return the relative path or a proxy route
    // We'll add a proxy route later if needed.
    $invoice['file_url'] = '/index.php?route=v1/invoices/file&id=' . $invoice['id'];

    json_success($invoice);

} catch (\Exception $e) {
    json_error('Error fetching invoice: ' . $e->getMessage(), 500);
}