<?php
header('Content-Type: application/json');
require_once __DIR__ . '/db/config.php';

$response = ['success' => false, 'error' => 'Invalid request'];

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $name = trim($_POST['name'] ?? '');
    $email = trim($_POST['email'] ?? '');
    $survey_id = trim($_POST['survey_id'] ?? '');
    $answers = $_POST['answers'] ?? [];

    if (empty($name) || empty($email) || empty($survey_id) || empty($answers)) {
        $response['error'] = 'Please fill out all fields.';
    } elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $response['error'] = 'Invalid email format.';
    } else {
        $pdo = db();
        try {
            $pdo->beginTransaction();

            // Insert into feedback_submissions
            $stmt = $pdo->prepare("INSERT INTO feedback_submissions (name, email, survey_id) VALUES (?, ?, ?)");
            $stmt->execute([$name, $email, $survey_id]);
            $submission_id = $pdo->lastInsertId();

            // Insert into survey_answers
            $answer_stmt = $pdo->prepare("INSERT INTO survey_answers (submission_id, question_id, answer_text) VALUES (?, ?, ?)");
            foreach ($answers as $question_id => $answer_text) {
                if (!empty($answer_text)) {
                    $answer_stmt->execute([$submission_id, $question_id, $answer_text]);
                }
            }

            $pdo->commit();
            $response['success'] = true;
            unset($response['error']);

            // Send email notification
            require_once __DIR__ . '/mail/MailService.php';
            $survey_stmt = $pdo->prepare("SELECT title FROM surveys WHERE id = ?");
            $survey_stmt->execute([$survey_id]);
            $survey_title = $survey_stmt->fetchColumn();

            $subject = "New Submission for Survey: " . $survey_title;
            $submission_url = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? "https" : "http") . "://" . $_SERVER['HTTP_HOST'] . '/view_submission.php?id=' . $submission_id;
            $htmlBody = "<p>A new submission has been received for the survey: <strong>{$survey_title}</strong></p>\n                         <p><strong>Submitter:</strong> {$name} ({$email})</p>\n                         <p><a href=\"{$submission_url}\">Click here to view the full submission.</a></p>";
            $textBody = "A new submission has been received for the survey: {$survey_title}. Submitter: {$name} ({$email}). View the submission here: {$submission_url}";
            
            MailService::sendMail(null, $subject, $htmlBody, $textBody);

        } catch (PDOException $e) {
            $pdo->rollBack();
            error_log($e->getMessage());
            $response['error'] = 'Database error. Could not submit feedback.';
        }
    }
}

echo json_encode($response);