<?php
// ================================================================
// Helper Functions
// ================================================================
require_once __DIR__ . '/../config/database.php';

/**
 * JSON response helper
 */
function jsonResponse(array $data, int $code = 200): void {
    http_response_code($code);
    header('Content-Type: application/json; charset=utf-8');
    header('Access-Control-Allow-Origin: *');
    echo json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

/**
 * Haversine formula: jarak antara dua koordinat (meter)
 */
function haversineDistance(float $lat1, float $lng1, float $lat2, float $lng2): float {
    $R = 6371000; // radius bumi meter
    $dLat = deg2rad($lat2 - $lat1);
    $dLng = deg2rad($lng2 - $lng1);
    $a = sin($dLat / 2) * sin($dLat / 2)
        + cos(deg2rad($lat1)) * cos(deg2rad($lat2))
        * sin($dLng / 2) * sin($dLng / 2);
    $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
    return $R * $c;
}

/**
 * Cari rumah ibadah terdekat dari koordinat
 */
function findNearestIbadah(float $lat, float $lng): ?array {
    $db = getDB();
    $rows = $db->query("SELECT id, nama, jenis, lat, lng, radius FROM rumah_ibadah")->fetchAll();
    $best = null;
    $minDist = PHP_FLOAT_MAX;
    foreach ($rows as $row) {
        $dist = haversineDistance($lat, $lng, (float)$row['lat'], (float)$row['lng']);
        if ($dist <= (float)$row['radius'] && $dist < $minDist) {
            $minDist = $dist;
            $best = array_merge($row, ['jarak' => round($dist, 2)]);
        }
    }
    // Jika tidak ada dalam radius, cari yang paling dekat saja
    if ($best === null && !empty($rows)) {
        foreach ($rows as $row) {
            $dist = haversineDistance($lat, $lng, (float)$row['lat'], (float)$row['lng']);
            if ($dist < $minDist) {
                $minDist = $dist;
                $best = array_merge($row, ['jarak' => round($dist, 2), 'di_luar_radius' => true]);
            }
        }
    }
    return $best;
}

/**
 * Sanitize string input
 */
function sanitize(string $val): string {
    return trim(htmlspecialchars($val, ENT_QUOTES, 'UTF-8'));
}

/**
 * Format radius display
 */
function formatRadius(int $meter): string {
    return $meter >= 1000 ? number_format($meter / 1000, 1) . ' km' : $meter . ' m';
}

/**
 * Format tanggal Indonesia
 */
function formatTanggal(?string $date): string {
    if (!$date) return '-';
    $ts = strtotime($date);
    $bulan = ['','Jan','Feb','Mar','Apr','Mei','Jun','Jul','Agt','Sep','Okt','Nov','Des'];
    return date('d', $ts) . ' ' . $bulan[(int)date('n', $ts)] . ' ' . date('Y', $ts);
}

/**
 * Handle file upload
 */
function handleUpload(array $file, string $prefix = 'bukti'): ?string {
    if ($file['error'] !== UPLOAD_ERR_OK) return null;
    if ($file['size'] > UPLOAD_MAX_SIZE) return null;

    $ext = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
    if (!in_array($ext, UPLOAD_ALLOWED)) return null;

    if (!is_dir(UPLOAD_DIR)) mkdir(UPLOAD_DIR, 0755, true);

    $filename = $prefix . '_' . date('Ymd_His') . '_' . uniqid() . '.' . $ext;
    $dest = UPLOAD_DIR . $filename;
    if (move_uploaded_file($file['tmp_name'], $dest)) return $filename;
    return null;
}

/**
 * Emoji dan label untuk jenis ibadah
 */
function ibadahEmoji(string $jenis): string {
    $map = [
        'Masjid'   => '🕌',
        'Musholla' => '🕌',
        'Gereja'   => '⛪',
        'Katolik'  => '⛪',
        'Pura'     => '🛕',
        'Vihara'   => '🛕',
        'Klenteng' => '⛩️',
        'Lainnya'  => '🙏',
    ];
    return $map[$jenis] ?? '🏛️';
}

/**
 * Color untuk marker berdasarkan status
 */
function statusColor(string $status): string {
    return match($status) {
        'sudah'    => '#22c55e',
        'menunggu' => '#f59e0b',
        default    => '#ef4444',
    };
}