<?php
// includes/config.php  v2.0
// ============================================================
// Konfigurasi Database & Konstanta Aplikasi
// ============================================================

// ── Database ──────────────────────────────────────────────
define('DB_HOST',    getenv('DB_HOST') ?: 'localhost');
define('DB_USER',    getenv('DB_USER') ?: 'root');
define('DB_PASS',    getenv('DB_PASS') ?: '');
define('DB_NAME',    getenv('DB_NAME') ?: 'sig_kemiskinan');
define('DB_CHARSET', 'utf8mb4');

// ── Aplikasi ──────────────────────────────────────────────
define('APP_NAME',   'SIG Kemiskinan v2.0');
define('NOMINATIM_URL', 'https://nominatim.openstreetmap.org');

// ── Upload Foto ────────────────────────────────────────────
define('UPLOAD_DIR',      __DIR__ . '/../assets/img/uploads/');
define('UPLOAD_URL',      'assets/img/uploads/');
define('MAX_FOTO_SIZE',   5 * 1024 * 1024);   // 5 MB
define('ALLOWED_EXT',     ['jpg','jpeg','png','webp']);

// ── Threshold Kategori Kemiskinan (Rp/bulan) ──────────────
// Disesuaikan dengan standar BPS & UMR Kalimantan Barat 2024
define('BATAS_SANGAT_MISKIN', 1500000);   // < 1.5jt  → sangat_miskin
define('BATAS_MISKIN',        3000000);   // < 3jt    → miskin
define('BATAS_HAMPIR_MISKIN', 5000000);   // < 5jt    → hampir_miskin
                                          // >= 5jt   → mampu
// ── Notifikasi ────────────────────────────────────────────
define('DATA_USANG_HARI', 30);   // data > 30 hari belum update = notif usang

// ============================================================
// FUNGSI: Koneksi Database (Singleton PDO)
// ============================================================
function getDB(): PDO {
    static $pdo = null;
    if ($pdo === null) {
        $dsn = "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME . ";charset=" . DB_CHARSET;
        $options = [
            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            PDO::ATTR_EMULATE_PREPARES   => false,
        ];
        try {
            $pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
        } catch (PDOException $e) {
            http_response_code(500);
            die(json_encode(['success' => false, 'error' => 'Database connection failed: ' . $e->getMessage()]));
        }
    }
    return $pdo;
}

// ============================================================
// FUNGSI: Response JSON
// ============================================================
function jsonResponse(mixed $data, int $code = 200): void {
    http_response_code($code);
    header('Content-Type: application/json; charset=utf-8');
    header('Access-Control-Allow-Origin: *');
    header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS');
    header('Access-Control-Allow-Headers: Content-Type, Authorization');
    echo json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

// ============================================================
// FUNGSI: Baca Input (JSON body atau $_POST)
// ============================================================
function getInput(): array {
    $raw  = file_get_contents('php://input');
    $data = json_decode($raw, true);
    if (json_last_error() !== JSON_ERROR_NONE) {
        $data = $_POST;
    }
    return $data ?? [];
}

// ============================================================
// FUNGSI: Hitung Jarak Haversine (meter)
// ============================================================
function haversine(float $lat1, float $lng1, float $lat2, float $lng2): float {
    $R    = 6371000;
    $dLat = deg2rad($lat2 - $lat1);
    $dLng = deg2rad($lng2 - $lng1);
    $a    = sin($dLat/2)**2 + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * sin($dLng/2)**2;
    return $R * 2 * atan2(sqrt($a), sqrt(1 - $a));
}

// ============================================================
// FUNGSI: Hitung Kategori Kemiskinan Otomatis
// ============================================================
function hitungKategori(?float $penghasilan): string {
    if ($penghasilan === null || $penghasilan < BATAS_SANGAT_MISKIN) return 'sangat_miskin';
    if ($penghasilan < BATAS_MISKIN) return 'miskin';
    if ($penghasilan < BATAS_HAMPIR_MISKIN) return 'hampir_miskin';
    return 'mampu';
}

// ============================================================
// FUNGSI: Assign Rumah Ibadah (kompatibel v1.1)
// ============================================================
function assignRumahIbadah(int $pendudukId): void {
    try {
        $db  = getDB();
        $p   = $db->prepare("SELECT lat, lng FROM penduduk_miskin WHERE id = ?");
        $p->execute([$pendudukId]);
        $row = $p->fetch();
        if (!$row) return;

        $ibadahList  = $db->query("SELECT id, lat, lng, radius FROM rumah_ibadah")->fetchAll();
        $closest     = null;
        $closestDist = PHP_FLOAT_MAX;

        foreach ($ibadahList as $ri) {
            $dist = haversine((float)$row['lat'], (float)$row['lng'], (float)$ri['lat'], (float)$ri['lng']);
            if ($dist <= $ri['radius'] && $dist < $closestDist) {
                $closest     = $ri['id'];
                $closestDist = $dist;
            }
        }

        $db->prepare("UPDATE penduduk_miskin SET rumah_ibadah_id = ?, jarak_ke_ibadah = ? WHERE id = ?")
           ->execute([$closest, $closest ? round($closestDist, 2) : null, $pendudukId]);
    } catch (\Exception $e) { /* abaikan error assign ibadah */ }
}

function reassignAll(): void {
    $db  = getDB();
    $all = $db->query("SELECT id FROM penduduk_miskin")->fetchAll();
    foreach ($all as $row) assignRumahIbadah((int)$row['id']);
}

// ============================================================
// FUNGSI: Catat Riwayat Verifikasi
// ============================================================
function catatRiwayat(int $pendudukId, int $userId, string $aksi, ?string $catatan = null, ?array $dataLama = null): void {
    $db = getDB();
    $db->prepare("
        INSERT INTO riwayat_verifikasi (penduduk_id, user_id, aksi, catatan, data_lama)
        VALUES (?, ?, ?, ?, ?)
    ")->execute([$pendudukId, $userId, $aksi, $catatan, $dataLama ? json_encode($dataLama, JSON_UNESCAPED_UNICODE) : null]);
}