refactor subjectscreen to use uiState

app/src/main/java/be/ugent/sel/studeez/common/composable/feed/FeedViewModel.kt

@@ -2,14 +2,16 @@ package be.ugent.sel.studeez.common.composable.feed
 
 import androidx.lifecycle.viewModelScope
 import be.ugent.sel.studeez.data.SelectedTask
-import be.ugent.sel.studeez.data.local.models.FeedEntry
 import be.ugent.sel.studeez.domain.FeedDAO
 import be.ugent.sel.studeez.domain.LogService
 import be.ugent.sel.studeez.domain.TaskDAO
 import be.ugent.sel.studeez.navigation.StudeezDestinations
 import be.ugent.sel.studeez.screens.StudeezViewModel
 import dagger.hilt.android.lifecycle.HiltViewModel
-import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 

app/src/main/java/be/ugent/sel/studeez/data/local/models/task/Subject.kt

@@ -6,10 +6,11 @@ import com.google.firebase.firestore.Exclude
 data class Subject(
     @DocumentId val id: String = "",
     val name: String = "",
-    val time: Int = 0,
     val argb_color: Long = 0,
     @get:Exclude @set:Exclude
     var taskCount: Int = 0,
     @get:Exclude @set:Exclude
     var taskCompletedCount: Int = 0,
+    @get:Exclude @set:Exclude
+    var time: Int = 0,
 )

app/src/main/java/be/ugent/sel/studeez/data/local/models/task/Task.kt

@@ -5,7 +5,7 @@ import com.google.firebase.firestore.DocumentId
 data class Task(
     @DocumentId val id: String = "",
     val name: String = "",
-    val completed: Boolean = false,
+    var completed: Boolean = false,
     val time: Int = 0,
     val subjectId: String = "",
     var archived: Boolean = false,

app/src/main/java/be/ugent/sel/studeez/screens/tasks/SubjectScreen.kt

@@ -1,11 +1,14 @@
 package be.ugent.sel.studeez.screens.tasks
 
-import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
+import androidx.compose.material.CircularProgressIndicator
+import androidx.compose.material.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
@@ -16,8 +19,6 @@ import be.ugent.sel.studeez.common.composable.drawer.DrawerActions
 import be.ugent.sel.studeez.common.composable.navbar.NavigationBarActions
 import be.ugent.sel.studeez.common.composable.tasks.SubjectEntry
 import be.ugent.sel.studeez.data.local.models.task.Subject
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.flowOf
 import be.ugent.sel.studeez.R.string as AppText
 
 @Composable
@@ -27,12 +28,13 @@ fun SubjectRoute(
     drawerActions: DrawerActions,
     navigationBarActions: NavigationBarActions,
 ) {
+    val uiState by viewModel.uiState.collectAsState()
     SubjectScreen(
         drawerActions = drawerActions,
         navigationBarActions = navigationBarActions,
-        addSubject = { viewModel.addSubject(open) },
+        onAddSubject = { viewModel.onAddSubject(open) },
-        getSubjects = viewModel::getSubjects,
         onViewSubject = { viewModel.onViewSubject(it, open) },
+        uiState,
     )
 }
 
@@ -40,9 +42,9 @@ fun SubjectRoute(
 fun SubjectScreen(
     drawerActions: DrawerActions,
     navigationBarActions: NavigationBarActions,
-    addSubject: () -> Unit,
+    onAddSubject: () -> Unit,
-    getSubjects: () -> Flow<List<Subject>>,
     onViewSubject: (Subject) -> Unit,
+    uiState: SubjectUiState,
 ) {
     PrimaryScreenTemplate(
         title = stringResource(AppText.my_subjects),
@@ -50,17 +52,29 @@ fun SubjectScreen(
         navigationBarActions = navigationBarActions,
         barAction = {},
     ) {
-        val subjects = getSubjects().collectAsState(initial = emptyList())
+        when (uiState) {
-        Column(
+            SubjectUiState.Loading -> Column(
-            modifier = Modifier.padding(top = 5.dp)
+                modifier = Modifier
-        ) {
+                    .fillMaxWidth()
-            NewTaskSubjectButton(onClick = addSubject, AppText.new_subject)
+                    .fillMaxHeight(),
-            LazyColumn {
+                verticalArrangement = Arrangement.Center,
-                items(subjects.value) {
+                horizontalAlignment = Alignment.CenterHorizontally
-                    SubjectEntry(
+            ) {
-                        subject = it,
+                CircularProgressIndicator(color = MaterialTheme.colors.onBackground)
-                        onViewSubject = { onViewSubject(it) },
+            }
-                    )
+            is SubjectUiState.Succes -> {
+                Column(
+                    modifier = Modifier.padding(top = 5.dp)
+                ) {
+                    NewTaskSubjectButton(onClick = onAddSubject, AppText.new_subject)
+                    LazyColumn {
+                        items(uiState.subjects) {
+                            SubjectEntry(
+                                subject = it,
+                                onViewSubject = { onViewSubject(it) },
+                            )
+                        }
+                    }
                 }
             }
         }
@@ -73,8 +87,28 @@ fun SubjectScreenPreview() {
     SubjectScreen(
         drawerActions = DrawerActions({}, {}, {}, {}, {}),
         navigationBarActions = NavigationBarActions({ false }, {}, {}, {}, {}, {}, {}, {}),
-        addSubject = {},
+        onAddSubject = {},
-        getSubjects = { flowOf() },
         onViewSubject = {},
+        uiState = SubjectUiState.Succes(
+            listOf(
+                Subject(
+                    name = "Test Subject",
+                    argb_color = 0xFFFFD200,
+                    taskCount = 5, taskCompletedCount = 2,
+                )
+            )
+        )
+    )
+}
+
+@Preview
+@Composable
+fun SubjectScreenLoadingPreview() {
+    SubjectScreen(
+        drawerActions = DrawerActions({}, {}, {}, {}, {}),
+        navigationBarActions = NavigationBarActions({ false }, {}, {}, {}, {}, {}, {}, {}),
+        onAddSubject = {},
+        onViewSubject = {},
+        uiState = SubjectUiState.Loading
     )
 }

app/src/main/java/be/ugent/sel/studeez/screens/tasks/SubjectUiState.kt

@@ -0,0 +1,8 @@
+package be.ugent.sel.studeez.screens.tasks
+
+import be.ugent.sel.studeez.data.local.models.task.Subject
+
+sealed interface SubjectUiState {
+    object Loading : SubjectUiState
+    data class Succes(val subjects: List<Subject>) : SubjectUiState
+}

app/src/main/java/be/ugent/sel/studeez/screens/tasks/SubjectViewModel.kt

@@ -1,5 +1,6 @@
 package be.ugent.sel.studeez.screens.tasks
 
+import androidx.lifecycle.viewModelScope
 import be.ugent.sel.studeez.data.SelectedSubject
 import be.ugent.sel.studeez.data.local.models.task.Subject
 import be.ugent.sel.studeez.domain.LogService
@@ -7,7 +8,7 @@ import be.ugent.sel.studeez.domain.SubjectDAO
 import be.ugent.sel.studeez.navigation.StudeezDestinations
 import be.ugent.sel.studeez.screens.StudeezViewModel
 import dagger.hilt.android.lifecycle.HiltViewModel
-import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.*
 import javax.inject.Inject
 
 @HiltViewModel
@@ -16,12 +17,17 @@ class SubjectViewModel @Inject constructor(
     private val selectedSubject: SelectedSubject,
     logService: LogService,
 ) : StudeezViewModel(logService) {
-    fun addSubject(open: (String) -> Unit) {
-        open(StudeezDestinations.ADD_SUBJECT_FORM)
-    }
 
-    fun getSubjects(): Flow<List<Subject>> {
+    val uiState: StateFlow<SubjectUiState> = subjectDAO.getSubjects()
-        return subjectDAO.getSubjects()
+        .map { SubjectUiState.Succes(it) }
+        .stateIn(
+            scope = viewModelScope,
+            initialValue = SubjectUiState.Loading,
+            started = SharingStarted.Eagerly,
+        )
+
+    fun onAddSubject(open: (String) -> Unit) {
+        open(StudeezDestinations.ADD_SUBJECT_FORM)
     }
 
     fun onViewSubject(subject: Subject, open: (String) -> Unit) {

app/src/main/java/be/ugent/sel/studeez/screens/tasks/TaskViewModel.kt

@@ -1,12 +1,10 @@
 package be.ugent.sel.studeez.screens.tasks
 
-import android.util.Log
 import be.ugent.sel.studeez.data.SelectedSubject
 import be.ugent.sel.studeez.data.SelectedTask
 import be.ugent.sel.studeez.data.local.models.task.Subject
 import be.ugent.sel.studeez.data.local.models.task.Task
 import be.ugent.sel.studeez.domain.LogService
-import be.ugent.sel.studeez.domain.SubjectDAO
 import be.ugent.sel.studeez.domain.TaskDAO
 import be.ugent.sel.studeez.navigation.StudeezDestinations
 import be.ugent.sel.studeez.screens.StudeezViewModel
@@ -17,7 +15,6 @@ import javax.inject.Inject
 @HiltViewModel
 class TaskViewModel @Inject constructor(
     private val taskDAO: TaskDAO,
-    private val subjectDAO: SubjectDAO,
     private val selectedSubject: SelectedSubject,
     private val selectedTask: SelectedTask,
     logService: LogService,
@@ -30,11 +27,6 @@ class TaskViewModel @Inject constructor(
         return taskDAO.getTasks(selectedSubject())
     }
 
-    fun deleteSubject(open: (String) -> Unit) {
-        subjectDAO.deleteSubject(selectedSubject())
-        open(StudeezDestinations.SUBJECT_SCREEN)
-    }
-
     fun getSelectedSubject(): Subject {
         return selectedSubject()
     }
@@ -44,12 +36,11 @@ class TaskViewModel @Inject constructor(
     }
 
     fun archiveTask(task: Task) {
-        task.archive()
+        taskDAO.updateTask(task.copy(archived = true))
-        taskDAO.updateTask(task)
     }
 
     fun toggleTaskCompleted(task: Task, completed: Boolean) {
-        taskDAO.toggleTaskCompleted(task, completed)
+        taskDAO.updateTask(task.copy(completed = completed))
     }
 
     fun editSubject(open: (String) -> Unit) {