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public_html/GYA2/

admin.php
admin_login.php
api/
config.php
css/
db_setup.php
index.php
js/
results.php
tests/

`index.php`

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<?php require __DIR__ . '/config.php'; ?>
<!DOCTYPE html>
<html lang="sv">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Start</title>
    <link rel="stylesheet" href="css/style.css">
</head>
<body>
    <div class="container">
        <h1>Välkommen!</h1>
        <p>Skriv in din e-post adress för att fortsätta. Du kommer få 3 korta uppgifter.</p>

        <form id="start-form">
            <div class="form-group">
                <label for="email">Din E-post adress</label>
                <input type="email" id="email" name="email" required placeholder="namn@varmdogymnasium.se">
            </div>

            <div class="form-group">
                <label for="group">Välj Grupp</label>
                <select id="group" name="group" required>
                    <option value="placebo">A</option>
                    <option value="control">B</option>
                </select>
            </div>

            <?php if ($DEBUG): ?>
            <div class="debug-section">
                <div class="form-group">
                    <label for="jump">Debug: Jump to test</label>
                    <select id="jump" name="jump">
                        <option value="">Normal flow</option>
                        <option value="tests/reaction.php">Reaction Time</option>
                        <option value="tests/maze.php">Maze</option>
                        <option value="tests/simon.php">Simon Says</option>
                        <option value="results.php">Results</option>
                    </select>
                </div>
            </div>
            <?php endif; ?>

            <button type="submit" class="btn btn-primary">Starta</button>
        </form>
    </div>

    <script>
        const DEBUG = <?= $DEBUG ? 'true' : 'false' ?>;

        document.getElementById('start-form').addEventListener('submit', async function(e) {
            e.preventDefault();

            const email = document.getElementById('email').value.trim();
            const group = document.getElementById('group').value;

            if (!email) {
                alert('Vänligen ange din e-postadress.');
                return;
            }

            try {
                const resp = await fetch('api/start_session.php', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({
                        email: email,
                        group_type: group,
                        user_agent: navigator.userAgent
                    })
                });

                if (!resp.ok) throw new Error('Server error: ' + resp.status);
                const data = await resp.json();

                sessionStorage.setItem('participant_id', data.participant_id);

                // Check for debug jump
                const jumpEl = document.getElementById('jump');
                if (DEBUG && jumpEl && jumpEl.value) {
                    window.location.href = jumpEl.value;
                } else {
                    window.location.href = 'tests/reaction.php';
                }
            } catch (err) {
                alert('Fel vid start av session: ' + err.message);
                console.error(err);
            }
        });
    </script>
</body>
</html>