<?php
/**
 * Fociz Thema API Endpoint (Dark / Light / System)
 */

header('Content-Type: application/json; charset=utf-8');
require_once __DIR__ . '/../includes/auth.php';

$user = require_auth(true);
$userId = (int)$user['id'];

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $currentTheme = get_user_theme($userId);
    echo json_encode([
        'success' => true,
        'theme'   => $currentTheme,
    ]);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $raw = file_get_contents('php://input');
    $data = json_decode($raw, true);
    
    $theme = $data['theme'] ?? ($_POST['theme'] ?? 'dark');
    if (!in_array($theme, ['dark', 'light', 'system'])) {
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Ongeldig thema. Kies dark, light of system.']);
        exit;
    }

    $ok = update_user_theme($userId, $theme);
    if ($ok) {
        echo json_encode([
            'success' => true,
            'theme'   => $theme,
            'message' => 'Themavoorkeur succesvol opgeslagen.',
        ]);
    } else {
        http_response_code(500);
        echo json_encode(['success' => false, 'error' => 'Kon thema niet opslaan in database.']);
    }
    exit;
}

http_response_code(405);
echo json_encode(['success' => false, 'error' => 'Method not allowed']);