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/**
* Copyright (C) 2018 Fernando Cejas Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.fernandocejas.sample.features.movies
import com.fernandocejas.sample.core.exception.Failure
import com.fernandocejas.sample.core.exception.Failure.NetworkConnection
import com.fernandocejas.sample.core.exception.Failure.ServerError
import com.fernandocejas.sample.core.functional.Either
import com.fernandocejas.sample.core.functional.Either.Left
import com.fernandocejas.sample.core.functional.Either.Right
import com.fernandocejas.sample.core.platform.NetworkHandler
import retrofit2.Call
import javax.inject.Inject
interface MoviesRepository {
fun movies(): Either<Failure, List<Movie>>
fun movieDetails(movieId: Int): Either<Failure, MovieDetails>
class Network
@Inject constructor(private val networkHandler: NetworkHandler,
private val service: MoviesService) : MoviesRepository {
override fun movies(): Either<Failure, List<Movie>> {
return when (networkHandler.isConnected) {
true -> request(service.movies(), { it.map { it.toMovie() } }, emptyList())
false, null -> Left(NetworkConnection())
}
}
override fun movieDetails(movieId: Int): Either<Failure, MovieDetails> {
return when (networkHandler.isConnected) {
true -> request(service.movieDetails(movieId), { it.toMovieDetails() }, MovieDetailsEntity.empty())
false, null -> Left(NetworkConnection())
}
}
private fun <T, R> request(call: Call<T>, transform: (T) -> R, default: T): Either<Failure, R> {
return try {
val response = call.execute()
when (response.isSuccessful) {
true -> Right(transform((response.body() ?: default)))
false -> Left(ServerError())
}
} catch (exception: Throwable) {
Left(ServerError())
}
}
}
}