add koin, retrofit and setup retrofit boilerplate

app/src/main/AndroidManifest.xml

@@ -2,7 +2,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.owenlejeune.tvtime">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
+        android:name=".TvTimeApplication"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"

app/src/main/java/com/owenlejeune/tvtime/TvTimeApplication.kt

@@ -0,0 +1,30 @@
+package com.owenlejeune.tvtime
+
+import android.app.Application
+import com.facebook.stetho.Stetho
+import com.owenlejeune.tvtime.di.modules.networkModule
+import org.koin.android.ext.koin.androidContext
+import org.koin.android.ext.koin.androidLogger
+import org.koin.core.context.startKoin
+import org.koin.core.logger.Level
+
+class TvTimeApplication: Application() {
+
+    override fun onCreate() {
+        super.onCreate()
+
+        // start koin
+        startKoin {
+            androidLogger(
+                if (BuildConfig.DEBUG) Level.ERROR else Level.NONE
+            )
+            androidContext(this@TvTimeApplication)
+            modules(networkModule)
+        }
+
+        if (BuildConfig.DEBUG) {
+            Stetho.initializeWithDefaults(this)
+        }
+    }
+
+}

app/src/main/java/com/owenlejeune/tvtime/api/Client.kt

@@ -0,0 +1,32 @@
+package com.owenlejeune.tvtime.api
+
+import okhttp3.Interceptor
+import org.koin.core.component.KoinComponent
+import org.koin.core.component.inject
+import retrofit2.Retrofit
+
+class Client(baseUrl: String): KoinComponent {
+
+    private val converter: Converter by inject()
+    private val client: HttpClient by inject()
+
+    private var retrofit: Retrofit = Retrofit.Builder()
+        .baseUrl(baseUrl)
+        .client(client.httpClient)
+        .addConverterFactory(converter.get())
+        .build()
+
+    fun <T> create(service: Class<T>): T {
+        return retrofit.create(service)
+    }
+
+    fun addInterceptor(interceptor: Interceptor) {
+        val iClient = client.httpClient.newBuilder()
+            .addInterceptor(interceptor)
+            .build()
+        retrofit = retrofit.newBuilder()
+            .client(iClient)
+            .build()
+    }
+
+}

app/src/main/java/com/owenlejeune/tvtime/api/Converter.kt

@@ -0,0 +1,9 @@
+package com.owenlejeune.tvtime.api
+
+import retrofit2.Converter
+
+interface Converter {
+
+    fun get(): Converter.Factory
+
+}

app/src/main/java/com/owenlejeune/tvtime/api/DebugHttpClient.kt

@@ -0,0 +1,10 @@
+package com.owenlejeune.tvtime.api
+
+import com.facebook.stetho.okhttp3.StethoInterceptor
+import okhttp3.OkHttpClient
+
+class DebugHttpClient: HttpClient {
+    override val httpClient: OkHttpClient = OkHttpClient.Builder()
+        .addNetworkInterceptor(StethoInterceptor())
+        .build()
+}

app/src/main/java/com/owenlejeune/tvtime/api/GsonConverter.kt

@@ -0,0 +1,13 @@
+package com.owenlejeune.tvtime.api
+
+import com.google.gson.GsonBuilder
+import retrofit2.converter.gson.GsonConverterFactory
+
+class GsonConverter: Converter {
+    override fun get(): retrofit2.Converter.Factory {
+        val gson = GsonBuilder()
+            .create()
+
+        return GsonConverterFactory.create(gson)
+    }
+}

app/src/main/java/com/owenlejeune/tvtime/api/HttpClient.kt

@@ -0,0 +1,7 @@
+package com.owenlejeune.tvtime.api
+
+import okhttp3.OkHttpClient
+
+interface HttpClient {
+    val httpClient: OkHttpClient
+}

app/src/main/java/com/owenlejeune/tvtime/api/ProdHttpClient.kt

@@ -0,0 +1,7 @@
+package com.owenlejeune.tvtime.api
+
+import okhttp3.OkHttpClient
+
+class ProdHttpClient: HttpClient {
+    override val httpClient: OkHttpClient = OkHttpClient.Builder().build()
+}

app/src/main/java/com/owenlejeune/tvtime/di/modules/modules.kt

@@ -0,0 +1,11 @@
+package com.owenlejeune.tvtime.di.modules
+
+import com.owenlejeune.tvtime.BuildConfig
+import com.owenlejeune.tvtime.api.*
+import org.koin.dsl.module
+
+val networkModule = module {
+    single { if (BuildConfig.DEBUG) DebugHttpClient() else ProdHttpClient() }
+    single<Converter> { GsonConverter() }
+    single { (baseUrl: String) -> Client(baseUrl) }
+}