interface ApiService {
    // Auth
    @POST("auth/send-otp")
    suspend fun sendOtp(@Body body: SendOtpRequest): ApiResponse<OtpResponse>

    @POST("auth/verify-otp")
    suspend fun verifyOtp(@Body body: VerifyOtpRequest): ApiResponse<AuthResponse>

    // Buses
    @GET("buses/search")
    suspend fun searchBuses(
        @Query("from_city_id")  fromCityId:   Int,
        @Query("to_city_id")    toCityId:     Int,
        @Query("journey_date")  journeyDate:  String,
        @Query("bus_type")      busType:      String? = null,
        @Query("sort")          sort:         String = "departure"
    ): ApiResponse<SearchResponse>

    // Seats
    @GET("seats/status")
    suspend fun getSeatStatus(@Query("trip_id") tripId: Int): ApiResponse<SeatLayoutResponse>

    @POST("seats/hold")
    suspend fun holdSeats(@Body body: HoldSeatRequest): ApiResponse<HoldResponse>

    // Bookings
    @POST("bookings/create")
    suspend fun createBooking(@Body body: CreateBookingRequest): ApiResponse<BookingResponse>

    @GET("bookings/list")
    suspend fun getBookings(
        @Query("page") page: Int = 1,
        @Query("status") status: String? = null
    ): ApiResponse<BookingListResponse>

    @GET("bookings/ticket")
    suspend fun getTicket(@Query("booking_ref") ref: String): ApiResponse<TicketResponse>

    @POST("bookings/cancel")
    suspend fun cancelBooking(@Body body: CancelRequest): ApiResponse<CancelResponse>

    // Wallet
    @GET("wallet/balance")
    suspend fun getWalletBalance(): ApiResponse<WalletResponse>

    @GET("wallet/transactions")
    suspend fun getTransactions(@Query("page") page: Int = 1): ApiResponse<TransactionListResponse>

    // Tracking
    @GET("tracking/live-location")
    suspend fun getLiveLocation(@Query("trip_id") tripId: Int): ApiResponse<LocationResponse>

    // Notifications
    @GET("notifications/list")
    suspend fun getNotifications(): ApiResponse<NotificationListResponse>
}

// Retrofit client setup
object ApiClient {
    private const val BASE_URL = "https://yourdomain.com/api/v1/"

    val retrofit: Retrofit by lazy {
        Retrofit.Builder()
            .baseUrl(BASE_URL)
            .client(buildOkHttp())
            .addConverterFactory(GsonConverterFactory.create())
            .build()
    }

    private fun buildOkHttp(): OkHttpClient {
        return OkHttpClient.Builder()
            .addInterceptor { chain ->
                val token = PrefsManager.getJwtToken()
                val req   = chain.request().newBuilder()
                    .addHeader("Authorization", "Bearer $token")
                    .addHeader("X-Api-Version", "1.0")
                    .addHeader("X-Device-ID", DeviceManager.getDeviceId())
                    .build()
                chain.proceed(req)
            }
            .addInterceptor(HttpLoggingInterceptor().setLevel(
                if (BuildConfig.DEBUG) HttpLoggingInterceptor.Level.BODY
                else HttpLoggingInterceptor.Level.NONE
            ))
            .connectTimeout(30, TimeUnit.SECONDS)
            .readTimeout(30, TimeUnit.SECONDS)
            .build()
    }

    val apiService: ApiService by lazy { retrofit.create(ApiService::class.java) }
}