NetworkModule

import com.google.gson.FieldNamingPolicy
import com.google.gson.Gson
import com.google.gson.GsonBuilder
import com.google.gson.JsonDeserializer
import dagger.Module
import dagger.Provides
import dagger.Reusable
import okhttp3.OkHttpClient
import okhttp3.logging.HttpLoggingInterceptor
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory
import retrofit2.converter.scalars.ScalarsConverterFactory
import java.util.*
import javax.inject.Singleton

@Module
class NetworkModule(private val baseUrl: String) {

    @Provides
    @Singleton
    internal fun provideOkHttpClient(): OkHttpClient {
        val httpLoggingInterceptor = HttpLoggingInterceptor()
        httpLoggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
        val client = OkHttpClient.Builder()
            .addInterceptor(httpLoggingInterceptor)
        return client.build()
    }

    @Provides
    @Reusable
    fun provideGson(): Gson {
        val gsonBuilder = GsonBuilder()
        gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
        gsonBuilder.registerTypeAdapter(Date::class.java, JsonDeserializer { json, _, _ -> Date(json.asJsonPrimitive.asLong) })
        return gsonBuilder.create()
    }

    @Provides
    @Reusable
    internal fun provideRetrofit(gson: Gson, okHttpClient: OkHttpClient): Retrofit {
        return Retrofit.Builder()
            .addConverterFactory(ScalarsConverterFactory.create())
            .addConverterFactory(GsonConverterFactory.create(gson))
            .baseUrl(baseUrl)
            .client(okHttpClient)
            .build()
    }
}