implement the album feature

albumlist/src/main/java/com/hako/albumlist/di/AlbumlistModules.kt

@@ -0,0 +1,15 @@
+package com.hako.albumlist.di
+
+import com.hako.albumlist.domain.datasource.AlbumlistRemoteApi
+import com.hako.albumlist.domain.usecase.GetAlbum
+import com.hako.albumlist.viewmodel.AlbumlistViewmodel
+import com.hako.base.domain.network.RemoteClient
+import org.koin.androidx.viewmodel.dsl.viewModel
+import org.koin.dsl.module
+
+val albumListModules = module {
+    factory { get<RemoteClient>().getClient(AlbumlistRemoteApi::class.java) }
+    factory { GetAlbum(get()) }
+
+    viewModel { AlbumlistViewmodel() }
+}

albumlist/src/main/java/com/hako/albumlist/domain/datasource/AlbumlistRemoteApi.kt

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+package com.hako.albumlist.domain.datasource
+
+import com.hako.albumlist.model.Album
+import io.reactivex.Single
+import retrofit2.http.GET
+import retrofit2.http.Query
+
+interface AlbumlistRemoteApi {
+
+    @GET("/albums")
+    fun getAlbums(
+        @Query("userId") userId: Int
+    ): Single<List<Album>>
+}

albumlist/src/main/java/com/hako/albumlist/domain/usecase/GetAlbum.kt

@@ -0,0 +1,42 @@
+package com.hako.albumlist.domain.usecase
+
+import com.hako.albumlist.domain.datasource.AlbumlistRemoteApi
+import com.hako.albumlist.model.AlbumViewable
+import com.hako.albumlist.model.toAlbumEntity
+import com.hako.albumlist.model.toUserViewable
+import com.hako.base.domain.database.dao.AlbumDao
+import io.reactivex.Single
+import io.reactivex.schedulers.Schedulers
+import org.koin.core.KoinComponent
+import org.koin.core.get
+
+class GetAlbum(private val dao: AlbumDao) : KoinComponent {
+
+    private val api: AlbumlistRemoteApi = get()
+
+    fun execute(
+        userId: Int,
+        onSuccess: (List<AlbumViewable>) -> Unit,
+        onError: (Throwable) -> Unit,
+        onLoading: () -> Unit
+    ) {
+        Single.fromCallable { dao.getAlbums(userId) }
+            .subscribeOn(Schedulers.io())
+            .doOnError { onError(it) }
+            .doOnSuccess { dbAlbum ->
+                if (dbAlbum.isEmpty() || dbAlbum.count() == 0) {
+                    api.getAlbums(userId)
+                        .doOnSuccess {
+                            dao.saveAll(it.map { album -> album.toAlbumEntity() })
+                            onSuccess(dao.getAlbums(userId).map { album -> album.toUserViewable() })
+                        }
+                        .doOnSubscribe { onLoading() }
+                        .subscribeOn(Schedulers.io())
+                        .subscribe({}, { onError(it) })
+                } else {
+                    onSuccess(dbAlbum.map { it.toUserViewable() })
+                }
+            }
+            .subscribe()
+    }
+}

albumlist/src/main/java/com/hako/albumlist/feature/AlbumlistFragment.kt

@@ -0,0 +1,81 @@
+package com.hako.albumlist.feature
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.hako.albumlist.R
+import com.hako.albumlist.model.AlbumViewable
+import com.hako.albumlist.viewmodel.AlbumlistViewmodel
+import com.hako.albumlist.widget.AlbumlistAdapter
+import com.hako.base.domain.network.RequestStatus
+import com.hako.base.extensions.gone
+import com.hako.base.extensions.observeNonNull
+import com.hako.base.extensions.toast
+import com.hako.base.extensions.visible
+import kotlinx.android.synthetic.main.fragment_albumlist.*
+import org.koin.androidx.viewmodel.ext.android.viewModel
+import timber.log.Timber
+
+class AlbumlistFragment : Fragment() {
+
+    private val viewModel: AlbumlistViewmodel by viewModel()
+    private val listAdapter by lazy { AlbumlistAdapter() }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
+    ): View = inflater.inflate(R.layout.fragment_albumlist, container, false)
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        setRecycler()
+        setObservers()
+        
+        //TODO: Get user by bundle
+        viewModel.fetchAlbums(2)
+    }
+
+    private fun setObservers() {
+        viewModel.data.observeNonNull(this) {
+            it.either(::handleFetchError, ::handleFetchSuccess)
+        }
+
+        viewModel.requestStatus.observeNonNull(this) {
+            when (it) {
+                RequestStatus.Ready -> {
+                    fragment_albumlist_error_overlay.gone()
+                    fragment_albumlist_loading_overlay.gone()
+                }
+                RequestStatus.Loading -> {
+                    fragment_albumlist_error_overlay.gone()
+                    fragment_albumlist_loading_overlay.visible()
+                }
+                RequestStatus.Errored -> {
+                    fragment_albumlist_error_overlay.visible()
+                    fragment_albumlist_loading_overlay.gone()
+                }
+            }
+        }
+    }
+
+    private fun handleFetchError(throwable: Throwable) {
+        Timber.e(throwable)
+    }
+
+    private fun handleFetchSuccess(users: List<AlbumViewable>) {
+        listAdapter.addAll(users)
+    }
+
+    private fun setRecycler() {
+        fragment_albumlist_recycler_container.apply {
+            layoutManager = LinearLayoutManager(context)
+            adapter = listAdapter.apply {
+                onItemClick = {
+                    context.toast(it.title)
+                }
+            }
+        }
+    }
+}

albumlist/src/main/java/com/hako/albumlist/model/AlbumModels.kt

@@ -0,0 +1,24 @@
+package com.hako.albumlist.model
+
+import android.os.Parcelable
+import com.google.gson.annotations.SerializedName
+import com.hako.base.domain.database.entities.AlbumEntity
+import kotlinx.android.parcel.Parcelize
+
+@Parcelize
+data class Album(
+    @SerializedName("id") val id: Int,
+    @SerializedName("userId") val userId: Int,
+    @SerializedName("title") val title: String
+) : Parcelable
+
+data class AlbumViewable(
+    val id: Int,
+    val userId: Int,
+    val title: String
+)
+
+fun Album.toAlbumEntity() = AlbumEntity(this.id, this.userId, this.title)
+
+fun AlbumEntity.toUserViewable() = AlbumViewable(this.id, this.userId, this.title)
+

albumlist/src/main/java/com/hako/albumlist/viewmodel/AlbumlistViewmodel.kt

@@ -0,0 +1,37 @@
+package com.hako.albumlist.viewmodel
+
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import com.hako.albumlist.domain.usecase.GetAlbum
+import com.hako.albumlist.model.AlbumViewable
+import com.hako.base.domain.network.RequestStatus
+import com.hako.base.domain.network.RequestStatus.Ready
+import com.hako.base.domain.network.RequestStatus.Loading
+import com.hako.base.domain.network.RequestStatus.Errored
+import com.hako.base.domain.Either
+import org.koin.core.KoinComponent
+import org.koin.core.get
+
+class AlbumlistViewmodel : ViewModel(), KoinComponent {
+
+    val data = MutableLiveData<Either<Throwable, List<AlbumViewable>>>()
+    val requestStatus = MutableLiveData<RequestStatus>()
+
+    private val getUsers: GetAlbum = get()
+
+    fun fetchAlbums(userId: Int) {
+        getUsers.execute(
+            userId,
+            onSuccess = {
+                requestStatus.postValue(Ready)
+                data.postValue(Either.Right(it))
+            },
+            onLoading = {
+                requestStatus.postValue(Loading)
+            },
+            onError = {
+                requestStatus.postValue(Errored)
+                data.postValue(Either.Left(it))
+            })
+    }
+}

albumlist/src/main/java/com/hako/albumlist/widget/AlbumlistAdapter.kt

@@ -0,0 +1,55 @@
+package com.hako.albumlist.widget
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import com.hako.albumlist.R
+import com.hako.albumlist.model.AlbumViewable
+import com.hako.base.extensions.autoNotify
+import kotlinx.android.synthetic.main.item_album_card.view.*
+import kotlin.properties.Delegates
+
+class AlbumlistAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+
+    private var items by Delegates.observable(emptyList<AlbumViewable>()) { _, oldList, newList ->
+        autoNotify(oldList, newList) { old, new -> old.id == new.id }
+        notifyDataSetChanged()
+    }
+
+    var onItemClick: (AlbumViewable) -> Unit = { }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder =
+        UserViewHolder(
+            LayoutInflater
+                .from(parent.context)
+                .inflate(R.layout.item_album_card, parent, false),
+            onItemClick
+        )
+
+    fun getItem(position: Int) = items[position]
+
+    fun addAll(list: List<AlbumViewable>) {
+        items = list
+    }
+
+    override fun getItemCount() = items.size
+
+    override fun onBindViewHolder(viewholder: RecyclerView.ViewHolder, position: Int) =
+        when (viewholder) {
+            is UserViewHolder -> viewholder.bind(items[position])
+            else -> throw NoWhenBranchMatchedException("Undefined viewholder")
+        }
+}
+
+class UserViewHolder(private val view: View,
+                     private val onItemClick: (AlbumViewable) -> Unit) :
+    RecyclerView.ViewHolder(view) {
+
+    fun bind(album: AlbumViewable) = with(view) {
+        item_album_card_album_name.text = album.title
+        item_album_card_container.setOnClickListener {
+            onItemClick(album)
+        }
+    }
+}

albumlist/src/main/res/layout/fragment_albumlist.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:id="@+id/fragment_albumlist_base">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/fragment_albumlist_recycler_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.hako.base.widgets.LoadingOverlay
+        android:id="@+id/fragment_albumlist_loading_overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.hako.base.widgets.NetworkErrorOverlay
+        android:id="@+id/fragment_albumlist_error_overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

albumlist/src/main/res/layout/item_album_card.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/item_album_card_container"
+    android:layout_width="match_parent"
+    android:layout_height="70dp"
+    android:layout_marginStart="8dp"
+    android:layout_marginTop="8dp"
+    android:layout_marginEnd="8dp"
+    android:background="@drawable/bg_card"
+    android:elevation="2dp"
+    android:orientation="vertical">
+
+    <TextView
+        android:id="@+id/item_album_card_album_name"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginTop="16dp"
+        android:textSize="18sp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="Real Name" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

albumlist/src/main/res/navigation/albumlist_navigation.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/albumlist_navigation"
+    app:startDestination="@id/albumlistFragment">
+
+    <fragment
+        android:id="@+id/albumlistFragment"
+        android:name="com.hako.albumlist.feature.AlbumlistFragment"
+        tools:layout="@layout/fragment_albumlist"
+        android:label="AlbumListFragment" />
+
+</navigation>