fix(stats): fix crash when opening last week screen with empty stats table

app/src/main/java/org/nsh07/pomodoro/ui/statsScreen/components/visualizations.kt

@@ -21,6 +21,7 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.MaterialTheme.colorScheme
@@ -33,6 +34,7 @@ import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
@@ -41,13 +43,19 @@ import org.nsh07.pomodoro.ui.theme.TomatoTheme
 import kotlin.math.roundToInt
 
 /**
- * A custom implementation of the 1-Dimensional heatmap plot that varies the width of the cells
- * instead of the colors. The colors are varied according to the `maxIndex` value passed but they do
- * NOT correspond to the actual values represented by the cells, and exist for aesthetic reasons
- * only.
+ * A "Horizontal stacked bar" component, which can be considered as a horizontal stacked bar chart
+ * with a single bar. This component can be stacked in a column to create a "100% stacked bar chart"
+ * where each bar is the same length to easily visualize proportions of each type of value
+ * represented
+ *
+ * @param values Values to be represented by the bar
+ * @param rankList A list of the rank of each element if the list was sorted in a non-increasing
+ * order
+ * @param height Height of the bar
+ * @param gap Gap between each part of the bar
  */
 @Composable
-fun VariableWidth1DHeatmap(
+fun HorizontalStackedBar(
     values: List<Long>,
     modifier: Modifier = Modifier,
     rankList: List<Int> = remember(values) {
@@ -112,60 +120,70 @@ fun FocusBreakRatioVisualization(
     height: Dp = 40.dp,
     gap: Dp = 2.dp
 ) {
-    val focusPercentage = ((focusDuration / (focusDuration.toFloat() + breakDuration)) * 100)
-    val breakPercentage = ((breakDuration / (focusDuration.toFloat() + breakDuration)) * 100)
-    Row(
-        verticalAlignment = Alignment.CenterVertically,
-        horizontalArrangement = Arrangement.spacedBy(gap),
-        modifier = modifier
-    ) {
-        Text(
-            text = focusPercentage.roundToInt().toString() + '%',
-            style = typography.bodyLarge,
-            color = colorScheme.primary,
-            modifier = Modifier.padding(end = 6.dp)
-        )
-        Spacer(
-            Modifier
-                .weight(focusPercentage)
-                .height(height)
-                .background(
-                    colorScheme.primary,
-                    shapes.large.copy(
-                        topEnd = shapes.extraSmall.topEnd,
-                        bottomEnd = shapes.extraSmall.bottomEnd
+    if (focusDuration + breakDuration > 0) {
+        val focusPercentage = ((focusDuration / (focusDuration.toFloat() + breakDuration)) * 100)
+        val breakPercentage = 100 - focusPercentage
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(gap),
+            modifier = modifier
+        ) {
+            Text(
+                text = focusPercentage.roundToInt().toString() + '%',
+                style = typography.bodyLarge,
+                color = colorScheme.primary,
+                modifier = Modifier.padding(end = 6.dp)
+            )
+            if (focusDuration > 0) Spacer(
+                Modifier
+                    .weight(focusPercentage)
+                    .height(height)
+                    .background(
+                        colorScheme.primary,
+                        if (breakDuration > 0) shapes.large.copy(
+                            topEnd = shapes.extraSmall.topEnd,
+                            bottomEnd = shapes.extraSmall.bottomEnd
+                        ) else shapes.large
                     )
-                )
-        )
-        Spacer(
-            Modifier
-                .weight(breakPercentage)
-                .height(height)
-                .background(
-                    colorScheme.tertiary,
-                    shapes.large.copy(
-                        topStart = shapes.extraSmall.topStart,
-                        bottomStart = shapes.extraSmall.bottomStart
+            )
+            if (breakDuration > 0) Spacer(
+                Modifier
+                    .weight(breakPercentage)
+                    .height(height)
+                    .background(
+                        colorScheme.tertiary,
+                        if (focusDuration > 0) shapes.large.copy(
+                            topStart = shapes.extraSmall.topStart,
+                            bottomStart = shapes.extraSmall.bottomStart
+                        ) else shapes.large
                     )
-                )
-        )
+            )
+            Text(
+                text = breakPercentage.roundToInt().toString() + '%',
+                style = typography.bodyLarge,
+                color = colorScheme.tertiary,
+                modifier = Modifier.padding(start = 6.dp)
+            )
+        }
+    } else {
         Text(
-            text = breakPercentage.roundToInt().toString() + '%',
+            text = "Not enough data",
             style = typography.bodyLarge,
-            color = colorScheme.tertiary,
-            modifier = Modifier.padding(start = 6.dp)
+            color = colorScheme.outline,
+            textAlign = TextAlign.Center,
+            modifier = Modifier.fillMaxSize()
         )
     }
 }
 
 @Preview
 @Composable
-fun VariableWidth1DHeatmapPreview() {
+fun HorizontalStackedBarPreview() {
     val values = listOf(38L, 190L, 114L, 14L)
     val rankList = listOf(2, 0, 1, 3)
     TomatoTheme(dynamicColor = false) {
         Surface {
-            VariableWidth1DHeatmap(
+            HorizontalStackedBar(
                 values = values,
                 rankList = rankList,
                 modifier = Modifier.padding(16.dp),

app/src/main/java/org/nsh07/pomodoro/ui/statsScreen/screens/LastWeekScreen.kt

@@ -28,6 +28,7 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
@@ -57,8 +58,8 @@ import com.patrykandpatrick.vico.core.common.data.ExtraStore
 import org.nsh07.pomodoro.R
 import org.nsh07.pomodoro.ui.mergePaddingValues
 import org.nsh07.pomodoro.ui.statsScreen.components.FocusBreakRatioVisualization
+import org.nsh07.pomodoro.ui.statsScreen.components.HorizontalStackedBar
 import org.nsh07.pomodoro.ui.statsScreen.components.TimeColumnChart
-import org.nsh07.pomodoro.ui.statsScreen.components.VariableWidth1DHeatmap
 import org.nsh07.pomodoro.ui.statsScreen.components.sharedBoundsReveal
 import org.nsh07.pomodoro.ui.theme.AppFonts.robotoFlexTopBar
 import org.nsh07.pomodoro.ui.theme.TomatoShapeDefaults.topListItemShape
@@ -213,7 +214,7 @@ fun SharedTransitionScope.LastWeekScreen(
                     color = colorScheme.onSurfaceVariant
                 )
             }
-            item { VariableWidth1DHeatmap(lastWeekAnalysisValues.first, rankList = rankList) }
+            item { HorizontalStackedBar(lastWeekAnalysisValues.first, rankList = rankList) }
             item {
                 Row {
                     lastWeekAnalysisValues.first.fastForEach {
@@ -260,6 +261,16 @@ fun SharedTransitionScope.LastWeekScreen(
             }
             item {
                 Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
+                    Row {
+                        Spacer(Modifier.width(18.dp))
+                        (0..8 step 2).forEach {
+                            Text(
+                                (it * 10).toString() + '%',
+                                style = typography.labelSmall,
+                                modifier = Modifier.weight(1f)
+                            )
+                        }
+                    }
                     lastWeekSummaryValues.fastForEach {
                         Row(verticalAlignment = Alignment.CenterVertically) {
                             Text(
@@ -267,7 +278,7 @@ fun SharedTransitionScope.LastWeekScreen(
                                 style = typography.labelSmall,
                                 modifier = Modifier.size(18.dp)
                             )
-                            VariableWidth1DHeatmap(it.second, rankList = rankList)
+                            HorizontalStackedBar(it.second, rankList = rankList)
                         }
                     }
                 }