Init UiState for activity type filter screen

WordPress/src/main/java/org/wordpress/android/ui/activitylog/list/filter/ActivityLogTypeFilterAdapter.kt

@@ -2,11 +2,11 @@ package org.wordpress.android.ui.activitylog.list.filter
 
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView.Adapter
-import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.ItemUiState
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.ListItemUiState
 import org.wordpress.android.ui.utils.UiHelpers
 
 class ActivityLogTypeFilterAdapter(private val uiHelpers: UiHelpers) : Adapter<ActivityLogTypeFilterViewHolder>() {
-    private val items = mutableListOf<ItemUiState>()
+    private val items = mutableListOf<ListItemUiState>()
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ActivityLogTypeFilterViewHolder {
         return ActivityLogTypeFilterViewHolder(parent, uiHelpers)
@@ -18,7 +18,7 @@ class ActivityLogTypeFilterAdapter(private val uiHelpers: UiHelpers) : Adapter<A
 
     override fun getItemCount(): Int = items.size
 
-    fun update(newItems: List<ItemUiState>) {
+    fun update(newItems: List<ListItemUiState>) {
         items.clear()
         items.addAll(newItems)
         notifyDataSetChanged()

WordPress/src/main/java/org/wordpress/android/ui/activitylog/list/filter/ActivityLogTypeFilterViewHolder.kt

@@ -4,7 +4,7 @@ import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
 import org.wordpress.android.R
-import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.ItemUiState
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.ListItemUiState
 import org.wordpress.android.ui.utils.UiHelpers
 
 class ActivityLogTypeFilterViewHolder(
@@ -13,6 +13,6 @@ class ActivityLogTypeFilterViewHolder(
 ) : RecyclerView.ViewHolder(
         LayoutInflater.from(parent.context).inflate(R.layout.activity_log_type_filter_item, parent, false)
 ) {
-    fun onBind(uiState: ItemUiState) {
+    fun onBind(uiState: ListItemUiState) {
     }
 }

WordPress/src/main/java/org/wordpress/android/ui/activitylog/list/filter/ActivityLogTypeFilterViewModel.kt

@@ -1,20 +1,118 @@
 package org.wordpress.android.ui.activitylog.list.filter
 
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
 import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import org.wordpress.android.R
+import org.wordpress.android.modules.BG_THREAD
 import org.wordpress.android.modules.UI_THREAD
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.ListItemUiState.SectionHeader
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.UiState.Content
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.UiState.FullscreenLoading
+import org.wordpress.android.ui.utils.UiString
+import org.wordpress.android.ui.utils.UiString.UiStringRes
+import org.wordpress.android.ui.utils.UiString.UiStringText
 import org.wordpress.android.viewmodel.ScopedViewModel
 import javax.inject.Inject
 import javax.inject.Named
 
 class ActivityLogTypeFilterViewModel @Inject constructor(
+    @Named(BG_THREAD) private val bgDispatcher: CoroutineDispatcher,
     @Named(UI_THREAD) private val mainDispatcher: CoroutineDispatcher
 ) : ScopedViewModel(mainDispatcher) {
     private var isStarted = false
 
+    private val _uiState = MutableLiveData<UiState>()
+    val uiState: LiveData<UiState> = _uiState
+
     fun start() {
         if (isStarted) return
         isStarted = true
+
+        _uiState.value = FullscreenLoading
+        fetchAvailableActivityTypes()
+    }
+
+    private fun fetchAvailableActivityTypes() {
+        launch {
+            // TODO malinjir initiate the fetch
+            onActivityTypesFetched(listOf(DummyActivityType, DummyActivityType, DummyActivityType))
+        }
+    }
+
+    private suspend fun onActivityTypesFetched(activityTypes: List<DummyActivityType>) {
+        _uiState.value = buildContentUiState(activityTypes)
+    }
+
+    private suspend fun buildContentUiState(activityTypes: List<DummyActivityType>): Content {
+        return withContext(bgDispatcher) {
+            // TODO malinjir replace the hardcoded header title
+            val headerListItem = SectionHeader(UiStringText("Test"))
+            // TODO malinjir replace "it.toString()" with activity type name
+            val activityTypeListItems: List<ListItemUiState.ActivityType> = activityTypes
+                    .map { ListItemUiState.ActivityType(title = UiStringText(it.toString())) }
+            Content(
+                    listOf(headerListItem) + activityTypeListItems,
+                    primaryAction = Action(label = UiStringRes(R.string.activity_log_activity_type_filter_apply))
+                            .apply { action = ::onApplyClicked },
+                    secondaryAction = Action(label = UiStringRes(R.string.activity_log_activity_type_filter_clear))
+                            .apply { action = ::onClearClicked }
+            )
+        }
+    }
+
+    private fun onApplyClicked() {
+        // TODO malinjir save and dismiss
+    }
+
+    private fun onClearClicked() {
+        (_uiState.value as? Content)?.let { it ->
+            _uiState.value = it.copy(items = getAllActivityTypeItemsUnchecked(it.items))
+        }
+    }
+
+    private fun getAllActivityTypeItemsUnchecked(listItemUiStates: List<ListItemUiState>): List<ListItemUiState> =
+            listItemUiStates.map { item ->
+                if (item is ListItemUiState.ActivityType) {
+                    item.copy(checked = false)
+                } else {
+                    item
+                }
+            }
+
+    sealed class UiState {
+        open val contentVisibility = false
+        open val loadingVisibility = false
+
+        object FullscreenLoading : UiState() {
+            override val loadingVisibility: Boolean = true
+        }
+
+        data class Content(
+            val items: List<ListItemUiState>,
+            val primaryAction: Action,
+            val secondaryAction: Action
+        ) : UiState() {
+            override val contentVisibility = true
+        }
+    }
+
+    sealed class ListItemUiState {
+        data class SectionHeader(
+            val title: UiString
+        ) : ListItemUiState()
+
+        data class ActivityType(
+            val title: UiString,
+            val checked: Boolean = false
+        ) : ListItemUiState()
+    }
+
+    data class Action(val label: UiString) {
+        var action: (() -> Unit)? = null
     }
 
-    object ItemUiState
+    object DummyActivityType
 }

WordPress/src/main/res/values/strings.xml

@@ -1026,6 +1026,8 @@
     <string name="activity_log_rewind_site">Rewind Site</string>
     <string name="activity_log_rewind_dialog_message">Are you sure you want to rewind your site back to %1$s at %2$s? This will remove all content and options created or changed since then.</string>
     <string name="activity_log_limited_content_on_free_plan">Since you\'re on a free plan, you\'ll see limited events in your activity.</string>
+    <string name="activity_log_activity_type_filter_apply">Apply</string>
+    <string name="activity_log_activity_type_filter_clear">Clear</string>
 
     <!-- scan -->
     <string name="scan">Scan</string>

WordPress/src/test/java/org/wordpress/android/ui/activitylog/list/filter/ActivityLogTypeFilterViewModelTest.kt

@@ -1,22 +1,51 @@
 package org.wordpress.android.ui.activitylog.list.filter
 
 import kotlinx.coroutines.InternalCoroutinesApi
+import org.assertj.core.api.Assertions.assertThat
 import org.junit.Before
 import org.junit.Test
 import org.wordpress.android.BaseUnitTest
 import org.wordpress.android.TEST_DISPATCHER
+import org.wordpress.android.test
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.ListItemUiState
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.UiState
+import org.wordpress.android.ui.activitylog.list.filter.ActivityLogTypeFilterViewModel.UiState.Content
 
 @InternalCoroutinesApi
 class ActivityLogTypeFilterViewModelTest : BaseUnitTest() {
     private lateinit var viewModel: ActivityLogTypeFilterViewModel
 
     @Before
     fun setUp() {
-        viewModel = ActivityLogTypeFilterViewModel(TEST_DISPATCHER)
+        viewModel = ActivityLogTypeFilterViewModel(TEST_DISPATCHER, TEST_DISPATCHER)
     }
 
     @Test
-    fun `skeleton test`() {
-        // Skeleton test.
+    fun `fullscreen loading shown, when screen initialized`() = test {
+        val uiStates = initObservers().uiStates
+
+        viewModel.start()
+
+        assertThat(uiStates[0]).isInstanceOf(UiState.FullscreenLoading::class.java)
+    }
+
+    @Test
+    fun `section header gets added as first item in the list, when content shown`() {
+        initObservers()
+
+        viewModel.start()
+
+        assertThat((viewModel.uiState.value as Content).items[0])
+                .isInstanceOf(ListItemUiState.SectionHeader::class.java)
     }
+
+    private fun initObservers(): Observers {
+        val uiStates = mutableListOf<UiState>()
+        viewModel.uiState.observeForever {
+            uiStates.add(it)
+        }
+        return Observers((uiStates))
+    }
+
+    private data class Observers(val uiStates: List<UiState>)
 }