Add: Main app, main activity and navigation handling

core/src/main/java/dev/carlos/core/domain/Either.kt

@@ -0,0 +1,33 @@
+package dev.carlos.core.domain
+
+sealed class Either<out L, out R> {
+
+    data class Left<out L>(val a: L) : Either<L, Nothing>()
+    data class Right<out R>(val b: R) : Either<Nothing, R>()
+
+    val isRight get() = this is Right<R>
+    val isLeft get() = this is Left<L>
+
+    fun <L> left(a: L) = Left(a)
+    fun <R> right(b: R) = Right(b)
+
+    fun either(fnL: (L) -> Any, fnR: (R) -> Any): Any =
+            when (this) {
+                is Left -> fnL(a)
+                is Right -> fnR(b)
+            }
+}
+
+fun <A, B, C> ((A) -> B).c(f: (B) -> C): (A) -> C = {
+    f(this(it))
+}
+
+fun <T, L, R> Either<L, R>.flatMap(fn: (R) -> Either<L, T>): Either<L, T> =
+        when (this) {
+            is Either.Left -> Either.Left(
+                a
+            )
+            is Either.Right -> fn(b)
+        }
+
+fun <T, L, R> Either<L, R>.map(fn: (R) -> (T)): Either<L, T> = this.flatMap(fn.c(::right))

core/src/main/java/dev/carlos/core/domain/network/RemoteClient.kt

@@ -0,0 +1,36 @@
+package dev.carlos.core.domain.network
+
+import dev.carlos.core.BuildConfig
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Retrofit
+import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory
+import retrofit2.converter.gson.GsonConverterFactory
+import timber.log.Timber
+import java.util.concurrent.TimeUnit
+
+private const val TIMEOUT_IN_SECONDS = 60L
+
+class RemoteClient(endpoint: String) {
+    private val logger = HttpLoggingInterceptor { message -> Timber.d(message) }.setLevel(getLoggerLevel())
+
+    private val client = OkHttpClient.Builder()
+        .addInterceptor(logger)
+        .readTimeout(TIMEOUT_IN_SECONDS, TimeUnit.SECONDS)
+        .connectTimeout(TIMEOUT_IN_SECONDS, TimeUnit.SECONDS)
+        .build()
+
+    private val retrofit: Retrofit = Retrofit.Builder()
+        .baseUrl(endpoint)
+        .addConverterFactory(GsonConverterFactory.create())
+        .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
+        .client(client)
+        .build()
+
+    fun <T> getClient(api: Class<T>): T = retrofit.create(api)
+
+    private fun getLoggerLevel() = when (BuildConfig.DEBUG) {
+        true -> HttpLoggingInterceptor.Level.BASIC
+        false -> HttpLoggingInterceptor.Level.NONE
+    }
+}

core/src/main/java/dev/carlos/core/domain/network/RequestStatus.kt

@@ -0,0 +1,8 @@
+package dev.carlos.core.domain.network
+
+sealed class RequestStatus {
+    object Ready : RequestStatus()
+    object Loading : RequestStatus()
+    object Errored : RequestStatus()
+    object Empty : RequestStatus()
+}

core/src/main/java/dev/carlos/core/extensions/ApplicationExtension.kt

@@ -0,0 +1,8 @@
+package dev.carlos.core.extensions
+
+import android.content.Context
+import android.widget.Toast
+
+fun Context.toast(message: String) {
+    Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
+}

core/src/main/java/dev/carlos/core/extensions/DataExtensions.kt

@@ -0,0 +1,15 @@
+package dev.carlos.core.extensions
+
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.Observer
+
+fun <T> LiveData<T>.observeNonNull(owner: LifecycleOwner, func: (T) -> Unit) {
+    observe(owner, Observer {
+        it?.let {
+            func(it)
+        }
+    })
+}
+
+fun Int.wasUpdated() = this > 0

core/src/main/java/dev/carlos/core/extensions/NavigationExtensions.kt

@@ -0,0 +1,32 @@
+package dev.carlos.core.extensions
+
+import android.os.Bundle
+import android.view.View
+import androidx.annotation.IdRes
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
+import androidx.navigation.fragment.NavHostFragment
+
+fun AppCompatActivity.findNavHostFragment(@IdRes id: Int) =
+    supportFragmentManager.findFragmentById(id) as NavHostFragment
+
+fun NavHostFragment.registerOnFragmentViewCreated(
+    recursive: Boolean = true,
+    listener: (currentFragment: Fragment) -> Unit
+) {
+    childFragmentManager
+        .registerFragmentLifecycleCallbacks(object : FragmentManager.FragmentLifecycleCallbacks() {
+            override fun onFragmentViewCreated(
+                fm: FragmentManager,
+                f: Fragment,
+                v: View,
+                savedInstanceState: Bundle?
+            ) {
+                super.onFragmentViewCreated(fm, f, v, savedInstanceState)
+                listener(f)
+            }
+        }, recursive)
+}
+
+fun buildNavigation(@IdRes id: Int, bundle: Bundle = Bundle()) = Pair(id, bundle)

core/src/main/java/dev/carlos/core/extensions/ViewExtensions.kt

@@ -0,0 +1,60 @@
+package dev.carlos.core.extensions
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.annotation.LayoutRes
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.RecyclerView
+
+fun View.enable() {
+    isEnabled = true
+}
+
+fun View.disable() {
+    isEnabled = false
+}
+
+fun View.visible() {
+    visibility = View.VISIBLE
+}
+
+fun View.invisible() {
+    visibility = View.INVISIBLE
+}
+
+fun View.transparent() {
+    alpha = 0f
+}
+
+fun View.opaque() {
+    alpha = 1f
+}
+
+fun View.gone() {
+    visibility = View.GONE
+}
+
+fun ViewGroup.inflate(@LayoutRes layout: Int, attachToRoot: Boolean = false): View =
+    LayoutInflater
+        .from(context)
+        .inflate(layout, this, attachToRoot)
+
+fun <T> RecyclerView.Adapter<*>.autoNotify(oldList: List<T>, newList: List<T>, compare: (T, T) -> Boolean) {
+    val diff = DiffUtil.calculateDiff(object : DiffUtil.Callback() {
+
+        override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+            return compare(oldList[oldItemPosition], newList[newItemPosition])
+        }
+
+        override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+            return oldList[oldItemPosition] == newList[newItemPosition]
+        }
+
+        override fun getOldListSize() = oldList.size
+
+        override fun getNewListSize() = newList.size
+    })
+
+    diff.dispatchUpdatesTo(this)
+}

core/src/main/java/dev/carlos/core/navigation/NavigationEvent.kt

@@ -0,0 +1,7 @@
+package dev.carlos.core.navigation
+
+interface NavigationEvent
+
+interface NavigationController {
+    fun sendNavigation(event: NavigationEvent)
+}

core/src/main/java/dev/carlos/core/navigation/NavigationRouter.kt

@@ -0,0 +1,13 @@
+package dev.carlos.core.navigation
+
+class NavigationRouter : NavigationController {
+    private var onNavigationEvent: (NavigationEvent) -> Unit = {}
+
+    override fun sendNavigation(event: NavigationEvent) {
+        onNavigationEvent(event)
+    }
+
+    fun setOnNavigationEvent(listener: (NavigationEvent) -> Unit) {
+        onNavigationEvent = listener
+    }
+}