package com.remek.rosettapos.communication.api

import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response

/**
 * Callback for the API calls.
 */
interface ApiCallback<T> : Callback<T> {

    companion object {
        const val UNKNOWN_ERROR_MESSAGE = "Unknown error"
    }

    override fun onResponse(call: Call<T>, response: Response<T>) {
        val responseBody = response.body()
        val error = response.errorBody()?.toString()
        if (response.isSuccessful && responseBody != null) {
            onSuccess(responseBody)
        } else {
            when (response.code()) {
                401 -> onError(CommunicationException.NotAuthenticatedException("Authentication not successful."))
                else -> onError(CommunicationException.UnknownCommunicationException(error ?: UNKNOWN_ERROR_MESSAGE))
            }
        }
    }

    override fun onFailure(call: Call<T>, t: Throwable) {
        onError(CommunicationException.UnknownCommunicationException(UNKNOWN_ERROR_MESSAGE))
    }

    /**
     * Called after a successful network request.
     *
     * @param response the response object.
     */
    fun onSuccess(response: T)

    /**
     * Called if network communication fails.
     *
     * @param error an exception that may tell more about the error.
     */
    fun onError(error: CommunicationException)

}