#74 refactor feed

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

@@ -9,21 +9,47 @@ import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import be.ugent.sel.studeez.common.composable.BasicTextButton
 import be.ugent.sel.studeez.common.composable.DateText
+import be.ugent.sel.studeez.common.composable.Headline
+import be.ugent.sel.studeez.common.ext.textButton
 import be.ugent.sel.studeez.data.local.models.FeedEntry
 import be.ugent.sel.studeez.data.local.models.timer_functional.HoursMinutesSeconds
+import be.ugent.sel.studeez.R.string as AppText
 
 @Composable
 fun Feed(
     uiState: FeedUiState,
     continueTask: (String, String) -> Unit,
+    onEmptyFeedHelp: () -> Unit
 ) {
     when (uiState) {
-        FeedUiState.Loading -> {
+        FeedUiState.Loading -> LoadingFeed()
+        is FeedUiState.Succes -> LoadedFeed(
+            uiState = uiState,
+            continueTask = continueTask,
+            onEmptyFeedHelp = onEmptyFeedHelp
+        )
+    }
+}
+
+@Composable
+fun LoadedFeed(
+    uiState: FeedUiState.Succes,
+    continueTask: (String, String) -> Unit,
+    onEmptyFeedHelp: () -> Unit,
+) {
+    if (uiState.feedEntries.isEmpty()) EmptyFeed(onEmptyFeedHelp)
+    else FeedWithElements(uiState = uiState, continueTask = continueTask)
+}
+
+@Composable
+fun LoadingFeed() {
     Column(
         modifier = Modifier
             .fillMaxWidth()
@@ -33,8 +59,13 @@ fun Feed(
     ) {
         CircularProgressIndicator(color = MaterialTheme.colors.onBackground)
     }
-        }
-        is FeedUiState.Succes -> {
+}
+
+@Composable
+fun FeedWithElements(
+    uiState: FeedUiState.Succes,
+    continueTask: (String, String) -> Unit,
+) {
     val feedEntries = uiState.feedEntries
     LazyColumn {
         items(feedEntries.toList()) { (date, feedEntries) ->
@@ -61,6 +92,22 @@ fun Feed(
             Spacer(modifier = Modifier.height(20.dp))
         }
     }
+}
+
+@Composable
+fun EmptyFeed(onEmptyFeedHelp: () -> Unit) {
+    Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+        Column(
+            horizontalAlignment = Alignment.CenterHorizontally,
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Headline(text = stringResource(id = AppText.your_feed))
+
+            BasicTextButton(
+                AppText.empty_feed_help_text,
+                Modifier.textButton(),
+                action = onEmptyFeedHelp,
+            )
         }
     }
 }
@@ -70,7 +117,7 @@ fun Feed(
 fun FeedLoadingPreview() {
     Feed(
         uiState = FeedUiState.Loading,
-        continueTask = { _, _ -> run {} },
+        continueTask = { _, _ -> run {} }, {}
     )
 }
 
@@ -108,6 +155,6 @@ fun FeedPreview() {
                 )
             )
         ),
-        continueTask = { _, _ -> run {} },
+        continueTask = { _, _ -> run {} }, {}
     )
 }