<?php
namespace App\Controllers\Web;

use Db\Database;
use App\Core\WebBaseController;
use App\Core\I18n;

class AuthController extends WebBaseController {

    public function loginPage() {
        if ($this->isLoggedIn()) { header('Location: /'); exit; }
        I18n::init();
        include __DIR__ . '/../../Views/Web/login.php';
    }

    public function loginSubmit() {
        header('Content-Type: application/json');
        $data = json_decode(file_get_contents('php://input'), true);
        $username = trim($data['username'] ?? '');
        $password = $data['password'] ?? '';
        $remember = $data['remember'] ?? false;

        if (empty($username) || empty($password)) {
            echo json_encode(['success' => false, 'message' => 'Please fill in all fields']);
            return;
        }

        $db = new Database();
        $user = $db->get('users', '*', ['username' => $username]);

        if (!$user || !password_verify($password, $user['password'])) {
            echo json_encode(['success' => false, 'message' => 'Invalid username or password']);
            return;
        }
        if (isset($user['status']) && $user['status'] == 0) {
            echo json_encode(['success' => false, 'message' => 'Account disabled']);
            return;
        }
        // 邮箱验证检查（虚拟账户跳过）
        if (empty($user['is_virtual']) && isset($user['email_verified']) && !$user['email_verified']) {
            echo json_encode(['success' => false, 'message' => 'Please verify your email first', 'need_verify' => true]);
            return;
        }

        if (session_status() === PHP_SESSION_NONE) session_start();
        $_SESSION['web_user_id'] = $user['id'];
        $_SESSION['web_username'] = $user['username'];
        $_SESSION['web_role'] = $user['role'] ?? 'user';
        $_SESSION['web_last_activity'] = time();
        $_SESSION['web_ip'] = $_SERVER['REMOTE_ADDR'];
        $_SESSION['web_ua'] = $_SERVER['HTTP_USER_AGENT'];
        if ($remember) $_SESSION['web_remember'] = true;
        if (!empty($user['lang'])) $_SESSION['lang'] = $user['lang'];

        echo json_encode(['success' => true, 'message' => 'Login successful', 'redirect' => '/']);
    }

    public function registerSubmit() {
        header('Content-Type: application/json');
        $data = json_decode(file_get_contents('php://input'), true);

        $username = trim($data['username'] ?? '');
        $password = $data['password'] ?? '';
        $confirmPassword = $data['confirm_password'] ?? '';
        $email = trim($data['email'] ?? '');
        $inviteCode = trim($data['invite_code'] ?? '');
        $verifyCode = trim($data['verify_code'] ?? '');

        if (empty($username) || empty($password) || empty($email)) {
            echo json_encode(['success' => false, 'message' => 'Please fill in all required fields']);
            return;
        }
        if (!preg_match('/^[a-zA-Z0-9_]{3,20}$/', $username)) {
            echo json_encode(['success' => false, 'message' => 'Username: 3-20 chars, letters/numbers/underscore only']);
            return;
        }
        if (strlen($password) < 6) {
            echo json_encode(['success' => false, 'message' => 'Password must be at least 6 characters']);
            return;
        }
        if ($password !== $confirmPassword) {
            echo json_encode(['success' => false, 'message' => 'Passwords do not match']);
            return;
        }
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            echo json_encode(['success' => false, 'message' => 'Invalid email address']);
            return;
        }

        $db = new Database();

        // 唯一性检查
        if ($db->get('users', 'id', ['username' => $username])) {
            echo json_encode(['success' => false, 'message' => 'Username already exists']);
            return;
        }
        if ($db->get('users', 'id', ['email' => $email])) {
            echo json_encode(['success' => false, 'message' => 'Email already registered']);
            return;
        }

        // 验证邮箱验证码
        $ev = $db->get('email_verifications', '*', [
            'email' => $email, 'code' => $verifyCode, 'used' => 0,
            'expires_at[>]' => date('Y-m-d H:i:s'),
            'ORDER' => ['id' => 'DESC']
        ]);
        if (!$ev) {
            echo json_encode(['success' => false, 'message' => 'Invalid or expired verification code']);
            return;
        }

        // 处理邀请码 → 代理关联
        $agentId = null;
        if (!empty($inviteCode)) {
            $agent = $db->get('agents', '*', ['agent_code' => $inviteCode, 'status' => 1]);
            if ($agent) $agentId = $agent['id'];
        }

        $db->insert('users', [
            'username' => $username,
            'password' => password_hash($password, PASSWORD_DEFAULT),
            'email' => $email,
            'role' => 'user',
            'status' => 1,
            'email_verified' => 1,
            'agent_id' => $agentId,
            'lang' => 'en',
            'created_at' => date('Y-m-d H:i:s'),
        ]);

        // 标记验证码已用
        $db->update('email_verifications', ['used' => 1], ['id' => $ev['id']]);

        echo json_encode(['success' => true, 'message' => 'Registration successful', 'redirect' => '/login']);
    }

    public function sendVerifyCode() {
        header('Content-Type: application/json');
        $data = json_decode(file_get_contents('php://input'), true);
        $email = trim($data['email'] ?? '');

        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            echo json_encode(['success' => false, 'message' => 'Invalid email']);
            return;
        }

        // 频率限制: 60秒内只能发一次
        $db = new Database();
        $recent = $db->get('email_verifications', '*', [
            'email' => $email,
            'created_at[>]' => date('Y-m-d H:i:s', time() - 60),
        ]);
        if ($recent) {
            echo json_encode(['success' => false, 'message' => 'Please wait 60 seconds']);
            return;
        }

        $code = str_pad(mt_rand(0, 999999), 6, '0', STR_PAD_LEFT);
        $db->insert('email_verifications', [
            'email' => $email,
            'code' => $code,
            'expires_at' => date('Y-m-d H:i:s', time() + 600), // 10分钟
            'created_at' => date('Y-m-d H:i:s'),
        ]);

        // 发送邮件
        $subject = 'Email Verification Code';
        $body = "Your verification code is: <b>$code</b><br>Valid for 10 minutes.";
        $sent = \App\Core\Mailer::send($email, $subject, $body);

        echo json_encode(['success' => true, 'message' => 'Verification code sent']);
    }

    public function logout() {
        if (session_status() === PHP_SESSION_NONE) session_start();
        $keys = ['web_user_id','web_username','web_role','web_last_activity','web_ip','web_ua','web_remember','lang'];
        foreach ($keys as $k) unset($_SESSION[$k]);
        header('Location: /login');
        exit;
    }

    private function isLoggedIn(): bool {
        if (session_status() === PHP_SESSION_NONE) session_start();
        return isset($_SESSION['web_user_id']);
    }
}