<?php
declare(strict_types=1);

@date_default_timezone_set('UTC');
if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

require_once __DIR__ . '/db/config.php';

$lang = $_GET['lang'] ?? ($_SESSION['lang'] ?? 'zh');
$lang = in_array($lang, ['zh', 'en'], true) ? $lang : 'zh';
$_SESSION['lang'] = $lang;

$i18n = [
    'zh' => [
        'site_name' => '金曜黄金交易所',
        'nav_home' => '首页',
        'nav_kyc' => 'KYC申请',
        'nav_status' => '状态查询',
        'nav_admin' => '后台管理',
        'hero_title' => '合规黄金交易入口，支持真实交易流程',
        'hero_subtitle' => '提交KYC、绑定资金账户并完成审核后即可开始交易。首版提供完整申请-审核-状态查询闭环。',
        'cta_kyc' => '提交KYC申请',
        'cta_status' => '查询申请状态',
        'badge' => 'MVP · 真实交易准备流程',
        'steps_title' => '三步启动交易',
        'step1_title' => '提交KYC信息',
        'step1_desc' => '录入身份信息与地址证明，系统生成申请编号。',
        'step2_title' => '审核与通知',
        'step2_desc' => '运营后台完成审核并更新状态。',
        'step3_title' => '资金准备与交易',
        'step3_desc' => '审核通过后即可进入资金与下单流程。',
        'features_title' => '首版功能',
        'feature1' => '双语中英文切换，适配国际客户',
        'feature2' => 'KYC申请、状态查询、后台审核闭环',
        'feature3' => '后续可扩展行情、下单、资金管理模块',
        'cta_admin' => '查看后台审核',
        'kyc_title' => 'KYC申请表',
        'kyc_subtitle' => '请填写真实信息，我们会在1-2个工作日完成审核。',
        'form_name' => '姓名（与证件一致）',
        'form_email' => '邮箱',
        'form_phone' => '手机号',
        'form_id' => '身份证/护照号',
        'form_address' => '居住地址',
        'form_doc' => '证明文件链接（可为云盘地址）',
        'form_submit' => '提交申请',
        'form_note' => '提交即表示同意平台条款与隐私政策。',
        'status_title' => 'KYC状态查询',
        'status_subtitle' => '输入申请编号查看最新审核状态。',
        'status_label' => '申请编号',
        'status_btn' => '查询',
        'status_empty' => '未找到该编号，请确认后重试。',
        'status_pending' => '等待审核',
        'status_approved' => '审核通过',
        'status_rejected' => '审核未通过',
        'admin_title' => 'KYC审核列表',
        'admin_subtitle' => '最新申请列表与审核状态更新。',
        'admin_view' => '查看详情',
        'admin_detail_title' => 'KYC详情',
        'admin_update' => '更新状态',
        'admin_back' => '返回列表',
        'admin_empty' => '暂无申请记录。',
        'alert_success' => '申请已提交，我们已生成申请编号。',
        'alert_error' => '请完整填写必填信息。',
        'alert_email' => '邮箱格式不正确。',
    ],
    'en' => [
        'site_name' => 'Jinyao Gold Exchange',
        'nav_home' => 'Home',
        'nav_kyc' => 'KYC Apply',
        'nav_status' => 'Check Status',
        'nav_admin' => 'Admin',
        'hero_title' => 'Compliant access to real gold trading',
        'hero_subtitle' => 'Submit KYC, prepare funding, and get approved to start trading. This MVP delivers the full apply-review-status loop.',
        'cta_kyc' => 'Submit KYC',
        'cta_status' => 'Check Status',
        'badge' => 'MVP · Real-trading onboarding',
        'steps_title' => 'Start in three steps',
        'step1_title' => 'Submit KYC',
        'step1_desc' => 'Provide identity and address documents and receive an application ID.',
        'step2_title' => 'Review & approval',
        'step2_desc' => 'Operations reviews and updates your status.',
        'step3_title' => 'Funding & trading',
        'step3_desc' => 'Approved users move to funding and order placement.',
        'features_title' => 'First release features',
        'feature1' => 'Bilingual Chinese/English interface',
        'feature2' => 'KYC application, status lookup, and admin review loop',
        'feature3' => 'Ready to extend with pricing, orders, and wallet modules',
        'cta_admin' => 'Open admin review',
        'kyc_title' => 'KYC Application',
        'kyc_subtitle' => 'Please submit accurate data. Review takes 1-2 business days.',
        'form_name' => 'Full legal name',
        'form_email' => 'Email',
        'form_phone' => 'Phone number',
        'form_id' => 'ID / Passport number',
        'form_address' => 'Residential address',
        'form_doc' => 'Document link (cloud storage URL)',
        'form_submit' => 'Submit application',
        'form_note' => 'By submitting you agree to our terms and privacy policy.',
        'status_title' => 'KYC Status Lookup',
        'status_subtitle' => 'Enter your application ID to see the latest status.',
        'status_label' => 'Application ID',
        'status_btn' => 'Search',
        'status_empty' => 'No record found. Please verify the ID.',
        'status_pending' => 'Pending review',
        'status_approved' => 'Approved',
        'status_rejected' => 'Rejected',
        'admin_title' => 'KYC Review List',
        'admin_subtitle' => 'Latest submissions and status updates.',
        'admin_view' => 'View details',
        'admin_detail_title' => 'KYC Details',
        'admin_update' => 'Update status',
        'admin_back' => 'Back to list',
        'admin_empty' => 'No applications yet.',
        'alert_success' => 'Application submitted. Your application ID is ready.',
        'alert_error' => 'Please complete all required fields.',
        'alert_email' => 'Email format is invalid.',
    ],
];

function t(string $key): string
{
    global $i18n, $lang;
    return $i18n[$lang][$key] ?? $key;
}

function h(?string $value): string
{
    return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
}

function url_with_lang(string $path, array $params = []): string
{
    global $lang;
    $params = array_merge(['lang' => $lang], $params);
    return $path . '?' . http_build_query($params);
}

function ensure_kyc_table(): void
{
    $pdo = db();
    $pdo->exec(
        "CREATE TABLE IF NOT EXISTS kyc_applications (
            id INT AUTO_INCREMENT PRIMARY KEY,
            full_name VARCHAR(120) NOT NULL,
            email VARCHAR(160) NOT NULL,
            phone VARCHAR(60) NOT NULL,
            id_number VARCHAR(60) NOT NULL,
            address VARCHAR(255) NOT NULL,
            doc_url VARCHAR(255) NOT NULL,
            status VARCHAR(20) NOT NULL DEFAULT 'pending',
            created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
    );
}