<?php
require_once 'config.php';

class EmailHandler {

    private $apiKey   = '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';
    private $fromEmail = 'registration@relevantreflex.com';
    private $fromName  = 'Relevant Reflex';

    public function sendVerificationEmail($email, $token) {
        $verificationUrl = SITE_URL . "/verify.php?token=" . $token;
        $subject = "Please verify your Relevant Reflex email address";
        $htmlBody = $this->getVerificationEmailTemplate($verificationUrl);
        $textBody = $this->getVerificationEmailText($verificationUrl);
        return $this->sendEmail($email, $subject, $htmlBody, $textBody);
    }

    public function sendPasswordResetEmail($email, $token) {
        $resetUrl = SITE_URL . "/reset-password.php?token=" . $token;
        $subject = "Password reset request for your Relevant Reflex account";
        $htmlBody = $this->getPasswordResetEmailTemplate($resetUrl);
        $textBody = $this->getPasswordResetEmailText($resetUrl);
        return $this->sendEmail($email, $subject, $htmlBody, $textBody);
    }

    private function sendEmail($to, $subject, $htmlBody, $textBody = '') {
        $payload = [
            'personalizations' => [[
                'to'      => [['email' => $to]],
                'subject' => $subject
            ]],
            'from'     => ['email' => $this->fromEmail, 'name' => $this->fromName],
            'reply_to' => ['email' => 'support@relevantreflex.com', 'name' => 'Relevant Reflex Support'],
            'content'  => [
                ['type' => 'text/plain', 'value' => $textBody ?: strip_tags($htmlBody)],
                ['type' => 'text/html',  'value' => $htmlBody]
            ],
            'headers' => [
                'List-Unsubscribe'      => '<mailto:support@relevantreflex.com?subject=unsubscribe>',
                'List-Unsubscribe-Post' => 'List-Unsubscribe=One-Click',
                'X-Mailer'              => 'Relevant Reflex Mailer'
            ],
            'categories'        => ['transactional', 'member-verification'],
            'tracking_settings' => [
                'click_tracking' => ['enable' => false],
                'open_tracking'  => ['enable' => true]
            ]
        ];

        $ch = curl_init('https://api.sendgrid.com/v3/mail/send');
        curl_setopt_array($ch, [
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => json_encode($payload),
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER     => [
                'Authorization: Bearer ' . $this->apiKey,
                'Content-Type: application/json'
            ],
            CURLOPT_TIMEOUT        => 30,
            CURLOPT_SSL_VERIFYPEER => true
        ]);
        $response   = curl_exec($ch);
        $statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($statusCode === 202) {
            return true;
        } else {
            error_log("SendGrid email failed to $to: HTTP $statusCode — $response");
            return false;
        }
    }

    // -----------------------------------------------------------------------
    // PLAIN TEXT VERSIONS
    // -----------------------------------------------------------------------

    private function getVerificationEmailText($verificationUrl) {
        return "Relevant Reflex — Email Verification
======================================

Thank you for registering with Relevant Reflex.

To activate your account, please verify your email address by visiting the link below:

" . $verificationUrl . "

This verification link expires in 7 days.

If you did not create an account with Relevant Reflex, please ignore this email.

Need help? Contact us at support@relevantreflex.com

— The Relevant Reflex Team
relevantreflex.com";
    }

    private function getPasswordResetEmailText($resetUrl) {
        return "Relevant Reflex — Password Reset
==================================

We received a request to reset the password for your Relevant Reflex account.

To set a new password, visit the link below:

" . $resetUrl . "

This link expires in 1 hour. If you did not request a password reset, please ignore this email — your password will not be changed.

Need help? Contact us at support@relevantreflex.com

— The Relevant Reflex Team
relevantreflex.com";
    }

    // -----------------------------------------------------------------------
    // HTML TEMPLATES
    // -----------------------------------------------------------------------

    private function getVerificationEmailTemplate($verificationUrl) {
        return '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Verify Your Email - Relevant Reflex</title>
<!--[if mso]>
<xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml>
<![endif]-->
<style type="text/css">
body, table, td, a { -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; }
table, td { mso-table-lspace: 0pt; mso-table-rspace: 0pt; }
img { -ms-interpolation-mode: bicubic; border: 0; outline: none; text-decoration: none; }
body { margin: 0; padding: 0; background-color: #f4f4f4; }
@media screen and (max-width: 600px) {
    .email-wrapper { width: 100% !important; }
    .email-body { padding: 20px !important; }
}
</style>
</head>
<body style="margin:0;padding:0;background-color:#f4f4f4;font-family:Arial,Helvetica,sans-serif;">

<table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0" style="background-color:#f4f4f4;">
<tr><td align="center" style="padding:30px 10px;">

    <table role="presentation" class="email-wrapper" width="600" cellpadding="0" cellspacing="0" border="0" style="background-color:#ffffff;border-radius:8px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.08);">

        <!-- HEADER -->
        <tr>
            <td align="center" bgcolor="#1a7a3c" style="background-color:#1a7a3c;padding:32px 30px;">
                <!--[if mso]>
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0">
                <tr><td align="center" bgcolor="#1a7a3c" style="background-color:#1a7a3c;">
                <![endif]-->
                <h1 style="margin:0;font-size:26px;font-weight:700;color:#ffffff;font-family:Arial,Helvetica,sans-serif;letter-spacing:0.5px;">Relevant Reflex</h1>
                <p style="margin:6px 0 0;font-size:13px;color:#a7f3c4;font-family:Arial,Helvetica,sans-serif;">India\'s Trusted Survey Platform</p>
                <!--[if mso]>
                </td></tr></table>
                <![endif]-->
            </td>
        </tr>

        <!-- BODY -->
        <tr>
            <td class="email-body" style="padding:36px 40px;">

                <h2 style="margin:0 0 16px;font-size:22px;font-weight:700;color:#1a7a3c;font-family:Arial,Helvetica,sans-serif;">Verify Your Email Address</h2>

                <p style="margin:0 0 20px;font-size:15px;color:#374151;line-height:1.7;font-family:Arial,Helvetica,sans-serif;">
                    Thank you for registering with Relevant Reflex. Please click the button below to verify your email address and activate your account.
                </p>

                <!-- CTA Button -->
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0">
                <tr><td align="center" style="padding:24px 0;">
                    <!--[if mso]>
                    <v:roundrect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word"
                        href="' . $verificationUrl . '"
                        style="height:50px;v-text-anchor:middle;width:280px;"
                        arcsize="30%" stroke="f" fillcolor="#1a7a3c">
                        <w:anchorlock/>
                        <center style="color:#ffffff;font-family:Arial,Helvetica,sans-serif;font-size:16px;font-weight:700;">
                            Verify My Email Address
                        </center>
                    </v:roundrect>
                    <![endif]-->
                    <!--[if !mso]><!-->
                    <a href="' . $verificationUrl . '"
                       style="display:inline-block;background-color:#1a7a3c;color:#ffffff;padding:16px 36px;text-decoration:none;border-radius:6px;font-weight:700;font-size:16px;font-family:Arial,Helvetica,sans-serif;letter-spacing:0.3px;">
                        Verify My Email Address
                    </a>
                    <!--<![endif]-->
                </td></tr>
                </table>

                <!-- Expiry notice -->
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0" style="margin-bottom:20px;">
                <tr>
                    <td bgcolor="#f0fdf4" style="background-color:#f0fdf4;border:1px solid #bbf7d0;border-radius:6px;padding:14px 18px;">
                        <p style="margin:0;font-size:14px;color:#166534;font-family:Arial,Helvetica,sans-serif;">
                            <strong>Note:</strong> This verification link expires in 7 days. Please verify soon to activate your account.
                        </p>
                    </td>
                </tr>
                </table>

                <p style="margin:0 0 8px;font-size:14px;color:#6b7280;font-family:Arial,Helvetica,sans-serif;">
                    If the button above does not work, copy and paste the link below into your browser:
                </p>
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0">
                <tr>
                    <td bgcolor="#f8f9fa" style="background-color:#f8f9fa;border-radius:4px;padding:12px;border:1px solid #e5e7eb;">
                        <p style="margin:0;font-size:12px;color:#374151;font-family:Courier,monospace;word-break:break-all;">
                            <a href="' . $verificationUrl . '" style="color:#1a7a3c;text-decoration:underline;">' . $verificationUrl . '</a>
                        </p>
                    </td>
                </tr>
                </table>

                <p style="margin:20px 0 0;font-size:13px;color:#9ca3af;font-family:Arial,Helvetica,sans-serif;">
                    Did not create this account? You can safely ignore this email.
                </p>

                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0" style="margin-top:28px;">
                <tr><td style="border-top:1px solid #e5e7eb;font-size:0;line-height:0;">&nbsp;</td></tr>
                </table>
            </td>
        </tr>

        <!-- FOOTER -->
        <tr>
            <td style="padding:20px 40px 28px;text-align:center;">
                <p style="margin:0 0 6px;font-size:12px;color:#9ca3af;font-family:Arial,Helvetica,sans-serif;">
                    This is a transactional email sent by Relevant Reflex in response to your registration.
                </p>
                <p style="margin:0;font-size:12px;color:#9ca3af;font-family:Arial,Helvetica,sans-serif;">
                    Need help? <a href="mailto:support@relevantreflex.com" style="color:#1a7a3c;text-decoration:none;">support@relevantreflex.com</a>
                </p>
            </td>
        </tr>

    </table>

</td></tr>
</table>

</body>
</html>';
    }

    private function getPasswordResetEmailTemplate($resetUrl) {
        return '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Password Reset - Relevant Reflex</title>
<!--[if mso]>
<xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml>
<![endif]-->
<style type="text/css">
body, table, td, a { -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; }
table, td { mso-table-lspace: 0pt; mso-table-rspace: 0pt; }
body { margin: 0; padding: 0; background-color: #f4f4f4; }
</style>
</head>
<body style="margin:0;padding:0;background-color:#f4f4f4;font-family:Arial,Helvetica,sans-serif;">

<table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0" style="background-color:#f4f4f4;">
<tr><td align="center" style="padding:30px 10px;">

    <table role="presentation" width="600" cellpadding="0" cellspacing="0" border="0" style="background-color:#ffffff;border-radius:8px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.08);">

        <!-- HEADER -->
        <tr>
            <td align="center" bgcolor="#1a7a3c" style="background-color:#1a7a3c;padding:32px 30px;">
                <!--[if mso]>
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0">
                <tr><td align="center" bgcolor="#1a7a3c" style="background-color:#1a7a3c;">
                <![endif]-->
                <h1 style="margin:0;font-size:26px;font-weight:700;color:#ffffff;font-family:Arial,Helvetica,sans-serif;">Relevant Reflex</h1>
                <p style="margin:6px 0 0;font-size:13px;color:#a7f3c4;font-family:Arial,Helvetica,sans-serif;">India\'s Trusted Survey Platform</p>
                <!--[if mso]>
                </td></tr></table>
                <![endif]-->
            </td>
        </tr>

        <!-- BODY -->
        <tr>
            <td style="padding:36px 40px;">

                <h2 style="margin:0 0 16px;font-size:22px;font-weight:700;color:#374151;font-family:Arial,Helvetica,sans-serif;">Password Reset Request</h2>

                <p style="margin:0 0 20px;font-size:15px;color:#374151;line-height:1.7;font-family:Arial,Helvetica,sans-serif;">
                    We received a request to reset the password for your Relevant Reflex account. Click the button below to set a new password.
                </p>

                <!-- CTA Button -->
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0">
                <tr><td align="center" style="padding:24px 0;">
                    <!--[if mso]>
                    <v:roundrect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word"
                        href="' . $resetUrl . '"
                        style="height:50px;v-text-anchor:middle;width:260px;"
                        arcsize="30%" stroke="f" fillcolor="#374151">
                        <w:anchorlock/>
                        <center style="color:#ffffff;font-family:Arial,Helvetica,sans-serif;font-size:16px;font-weight:700;">
                            Reset My Password
                        </center>
                    </v:roundrect>
                    <![endif]-->
                    <!--[if !mso]><!-->
                    <a href="' . $resetUrl . '"
                       style="display:inline-block;background-color:#374151;color:#ffffff;padding:16px 36px;text-decoration:none;border-radius:6px;font-weight:700;font-size:16px;font-family:Arial,Helvetica,sans-serif;">
                        Reset My Password
                    </a>
                    <!--<![endif]-->
                </td></tr>
                </table>

                <!-- Expiry notice -->
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0" style="margin-bottom:20px;">
                <tr>
                    <td bgcolor="#fff8e1" style="background-color:#fff8e1;border:1px solid #ffe082;border-radius:6px;padding:14px 18px;">
                        <p style="margin:0;font-size:14px;color:#7c5500;font-family:Arial,Helvetica,sans-serif;">
                            <strong>Note:</strong> This password reset link expires in 1 hour. If you did not request this, please ignore it — your password will not change.
                        </p>
                    </td>
                </tr>
                </table>

                <p style="margin:0 0 8px;font-size:14px;color:#6b7280;font-family:Arial,Helvetica,sans-serif;">
                    If the button above does not work, copy and paste the link below into your browser:
                </p>
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0">
                <tr>
                    <td bgcolor="#f8f9fa" style="background-color:#f8f9fa;border-radius:4px;padding:12px;border:1px solid #e5e7eb;">
                        <p style="margin:0;font-size:12px;color:#374151;font-family:Courier,monospace;word-break:break-all;">
                            <a href="' . $resetUrl . '" style="color:#1a7a3c;text-decoration:underline;">' . $resetUrl . '</a>
                        </p>
                    </td>
                </tr>
                </table>

            </td>
        </tr>

        <!-- DIVIDER -->
        <tr>
            <td style="padding:0 40px;">
                <table role="presentation" width="100%" cellpadding="0" cellspacing="0" border="0">
                <tr><td style="border-top:1px solid #e5e7eb;font-size:0;line-height:0;">&nbsp;</td></tr>
                </table>
            </td>
        </tr>

        <!-- FOOTER -->
        <tr>
            <td style="padding:20px 40px 28px;text-align:center;">
                <p style="margin:0 0 6px;font-size:12px;color:#9ca3af;font-family:Arial,Helvetica,sans-serif;">
                    This is a transactional email sent by Relevant Reflex in response to a password reset request.
                </p>
                <p style="margin:0;font-size:12px;color:#9ca3af;font-family:Arial,Helvetica,sans-serif;">
                    Need help? <a href="mailto:support@relevantreflex.com" style="color:#1a7a3c;text-decoration:none;">support@relevantreflex.com</a>
                </p>
            </td>
        </tr>

    </table>

</td></tr>
</table>

</body>
</html>';
    }
}