<?php
// ============================================
// api/kerusakan.php - CRUD API Kerusakan Jalan
// ============================================

require_once '../config.php';

$method = $_SERVER['REQUEST_METHOD'];
$db     = getDB();

// Handle sub-resource: ?action=histori&id=X
$action = $_GET['action'] ?? '';

if ($action === 'histori') {
    // GET histori untuk kerusakan tertentu
    $id = intval($_GET['id'] ?? 0);
    if (!$id) { http_response_code(400); echo json_encode(['success'=>false,'message'=>'ID diperlukan']); exit; }
    $stmt = $db->prepare("SELECT * FROM histori_kerusakan WHERE kerusakan_id=? ORDER BY tgl_perubahan DESC");
    $stmt->bind_param('i', $id);
    $stmt->execute();
    $result = $stmt->get_result();
    $data = [];
    while ($row = $result->fetch_assoc()) $data[] = $row;
    echo json_encode(['success'=>true, 'data'=>$data]);
    $db->close(); exit;
}

if ($action === 'update_status') {
    // POST update status + catat histori
    $input = json_decode(file_get_contents('php://input'), true);
    $id           = intval($input['id'] ?? 0);
    $status_baru  = $input['status_baru'] ?? '';
    $catatan      = $input['catatan'] ?? '';
    if (!$id || !$status_baru) { http_response_code(400); echo json_encode(['success'=>false,'message'=>'ID dan status_baru diperlukan']); exit; }

    // Ambil status lama
    $stmt = $db->prepare("SELECT status_laporan FROM kerusakan_jalan WHERE id=?");
    $stmt->bind_param('i', $id);
    $stmt->execute();
    $row = $stmt->get_result()->fetch_assoc();
    if (!$row) { http_response_code(404); echo json_encode(['success'=>false,'message'=>'Data tidak ditemukan']); exit; }

    $status_lama = $row['status_laporan'];

    // Update status
    $stmt2 = $db->prepare("UPDATE kerusakan_jalan SET status_laporan=? WHERE id=?");
    $stmt2->bind_param('si', $status_baru, $id);
    $stmt2->execute();

    // Catat histori
    $stmt3 = $db->prepare("INSERT INTO histori_kerusakan (kerusakan_id, status_lama, status_baru, catatan) VALUES (?,?,?,?)");
    $stmt3->bind_param('isss', $id, $status_lama, $status_baru, $catatan);
    $stmt3->execute();

    echo json_encode(['success'=>true, 'message'=>'Status kerusakan diupdate']);
    $db->close(); exit;
}

switch ($method) {

    // ── READ ────────────────────────────────────────────────────────
    case 'GET':
        if (isset($_GET['id'])) {
            $id   = intval($_GET['id']);
            $stmt = $db->prepare("SELECT * FROM kerusakan_jalan WHERE id=?");
            $stmt->bind_param('i', $id);
            $stmt->execute();
            $row = $stmt->get_result()->fetch_assoc();
            if ($row) {
                echo json_encode(['success'=>true, 'data'=>$row]);
            } else {
                http_response_code(404);
                echo json_encode(['success'=>false, 'message'=>'Data tidak ditemukan']);
            }
        } else {
            // Filter opsional: ?jalan_id=X atau ?status=X
            $where = [];
            $params = '';
            $vals = [];
            if (!empty($_GET['jalan_id'])) {
                $where[] = 'jalan_id=?'; $params .= 'i'; $vals[] = intval($_GET['jalan_id']);
            }
            if (!empty($_GET['status'])) {
                $where[] = 'status_laporan=?'; $params .= 's'; $vals[] = $_GET['status'];
            }
            $sql = "SELECT k.*, j.nama_jalan as jalan_nama FROM kerusakan_jalan k LEFT JOIN jalan j ON k.jalan_id=j.id";
            if ($where) $sql .= ' WHERE '.implode(' AND ', $where);
            $sql .= ' ORDER BY k.tgl_laporan DESC';
            $stmt = $db->prepare($sql);
            if ($params) $stmt->bind_param($params, ...$vals);
            $stmt->execute();
            $result = $stmt->get_result();
            $data = [];
            while ($row = $result->fetch_assoc()) $data[] = $row;

            // Hitung kluster per lokasi (radius ~50m)
            foreach ($data as &$item) {
                $cnt = 0;
                foreach ($data as $other) {
                    $dlat = ($item['lat'] - $other['lat']) * 111000;
                    $dlng = ($item['lng'] - $other['lng']) * 111000 * cos(deg2rad($item['lat']));
                    if (sqrt($dlat*$dlat + $dlng*$dlng) < 50) $cnt++;
                }
                $item['laporan_terdekat'] = $cnt;
            }
            echo json_encode(['success'=>true, 'data'=>$data]);
        }
        break;

    // ── CREATE ──────────────────────────────────────────────────────
    case 'POST':
        $input = json_decode(file_get_contents('php://input'), true);

        $required = ['deskripsi','tingkat_urgensi','lat','lng'];
        foreach ($required as $f) {
            if (empty($input[$f]) && $input[$f] !== 0) {
                http_response_code(400);
                echo json_encode(['success'=>false,'message'=>"Field $f diperlukan"]);
                exit;
            }
        }

        $jalan_id        = !empty($input['jalan_id'])        ? intval($input['jalan_id'])        : null;
        $nama_jalan_ref  = trim($input['nama_jalan_ref']  ?? '');
        $deskripsi       = trim($input['deskripsi']);
        $tingkat_urgensi = $input['tingkat_urgensi'];
        $lat             = floatval($input['lat']);
        $lng             = floatval($input['lng']);
        $foto_base64     = $input['foto_base64'] ?? null;

        $valid_urgensi = ['Rendah','Sedang','Tinggi','Kritis'];
        if (!in_array($tingkat_urgensi, $valid_urgensi)) {
            http_response_code(400);
            echo json_encode(['success'=>false,'message'=>'Tingkat urgensi tidak valid']);
            break;
        }

        $stmt = $db->prepare(
            "INSERT INTO kerusakan_jalan (jalan_id, nama_jalan_ref, deskripsi, tingkat_urgensi, lat, lng, foto_base64) VALUES (?,?,?,?,?,?,?)"
        );
        $stmt->bind_param('isssdds', $jalan_id, $nama_jalan_ref, $deskripsi, $tingkat_urgensi, $lat, $lng, $foto_base64);

        if ($stmt->execute()) {
            echo json_encode(['success'=>true,'message'=>'Laporan kerusakan berhasil disimpan','id'=>$db->insert_id]);
        } else {
            http_response_code(500);
            echo json_encode(['success'=>false,'message'=>'Gagal menyimpan data']);
        }
        break;

    // ── UPDATE ──────────────────────────────────────────────────────
    case 'PUT':
        $input = json_decode(file_get_contents('php://input'), true);
        $id = intval($input['id'] ?? 0);
        if (!$id) { http_response_code(400); echo json_encode(['success'=>false,'message'=>'ID diperlukan']); break; }

        $deskripsi       = trim($input['deskripsi'] ?? '');
        $tingkat_urgensi = $input['tingkat_urgensi'] ?? '';
        $nama_jalan_ref  = trim($input['nama_jalan_ref'] ?? '');

        $stmt = $db->prepare("UPDATE kerusakan_jalan SET deskripsi=?, tingkat_urgensi=?, nama_jalan_ref=? WHERE id=?");
        $stmt->bind_param('sssi', $deskripsi, $tingkat_urgensi, $nama_jalan_ref, $id);

        if ($stmt->execute()) {
            echo json_encode(['success'=>true,'message'=>'Data kerusakan diupdate']);
        } else {
            http_response_code(500);
            echo json_encode(['success'=>false,'message'=>'Gagal mengupdate data']);
        }
        break;

    // ── DELETE ──────────────────────────────────────────────────────
    case 'DELETE':
        $input = json_decode(file_get_contents('php://input'), true);
        $id    = intval($input['id'] ?? ($_GET['id'] ?? 0));
        if (!$id) { http_response_code(400); echo json_encode(['success'=>false,'message'=>'ID diperlukan']); break; }

        $stmt = $db->prepare("DELETE FROM kerusakan_jalan WHERE id=?");
        $stmt->bind_param('i', $id);
        if ($stmt->execute() && $stmt->affected_rows > 0) {
            echo json_encode(['success'=>true,'message'=>'Laporan kerusakan dihapus']);
        } else {
            http_response_code(404);
            echo json_encode(['success'=>false,'message'=>'Data tidak ditemukan']);
        }
        break;

    default:
        http_response_code(405);
        echo json_encode(['success'=>false,'message'=>'Method tidak diizinkan']);
}

$db->close();
?>