refactor: Improve QuizScreen layout and choice presentation

This commit refactors the `QuizScreen` to use a `Column` instead of a `LazyColumn` for its main layout, improving the positioning and sizing of elements. It also introduces an `EvenGrid` composable for displaying choices, ensuring they are evenly distributed.

Key changes:

- **QuizScreen.kt:**
    - Changed the main layout from `LazyColumn` to `Column`.
    - Toolbar, QuestionContent, Choices, Timer, and ContinueButton are now direct children of the `Column`.
    - `QuestionContent` now uses `fillMaxHeight(0.5f)` to take up half the available height.
    - `Choices` composable now uses `weight(1f)` to fill remaining space.
    - Removed `animateContentSize` and `animateItem` modifiers.
    - Refactored how individual UI sections (toolbar, question, choices, timer, continue button) are structured within the main `Column`.
- **components/EvenGrid.kt:**
    - Added a new reusable `EvenGrid` composable that arranges items into a grid with a specified number of columns, ensuring even distribution.
- **components/Choices.kt:**
    - Replaced `FlowRow` with the new `EvenGrid` composable to display choices.
    - `ChoiceItem` now uses `fillMaxHeight()` within the `EvenGrid` cell.
    - Removed explicit height setting for `ChoiceItem`'s `Box`.
- **components/QuestionContent.kt:**
    - `AsyncImage` within `QuestionContent` now uses `weight(1f)` instead of `heightIn(min = 200.dp)`.
- **components/TimerBar.kt:**
    - Removed `coerceIn(0f, 1f)` for `progress` in `fillMaxWidth` as progress should already be within this range.
- **QuizScreenViewModel.kt & domain/models/Question.kt:**
    - Made `Question.choices` non-nullable (`List<Choice>`) and updated the mapper and ViewModel to reflect this. This simplifies null checks for `currentQuestion.choices`.
    - Accessing `quizState.quiz.questions[currentQuestionIndex]` directly instead of `getOrNull` as the index should always be valid.
- **data/mappers/QuizMapper.kt:**
    - Updated `QuestionDto.toDomain()` to return `orEmpty()` for choices, ensuring a non-null list.

data/src/main/kotlin/dev/adriankuta/kahootquiz/data/mappers/QuizMapper.kt

@@ -153,7 +153,7 @@ private fun QuestionDto.toDomain(): Question = Question(
     time = time?.milliseconds,
     points = points,
     pointsMultiplier = pointsMultiplier,
-    choices = choices?.map { it.toDomain() },
+    choices = choices?.map { it.toDomain() }.orEmpty(),
     layout = layout,
     image = image,
     imageMetadata = imageMetadata?.toDomain(),

domain/src/main/kotlin/dev/adriankuta/kahootquiz/domain/models/Question.kt

@@ -10,7 +10,7 @@ data class Question(
     val time: Duration?,
     val points: Boolean? = null,
     val pointsMultiplier: Int?,
-    val choices: List<Choice>?,
+    val choices: List<Choice>,
     val layout: String? = null,
     val image: String? = null,
     val imageMetadata: ImageMetadata?,

ui/quiz/src/main/kotlin/dev/adriankuta/kahootquiz/ui/quiz/QuizScreen.kt

@@ -1,13 +1,13 @@
 package dev.adriankuta.kahootquiz.ui.quiz
 
-import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListScope
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.ButtonDefaults
@@ -85,28 +85,10 @@ private fun QuizScreenSuccess(
     onContinue: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    LazyColumn(
+    Column(
         modifier = modifier
-            .fillMaxWidth()
-            .animateContentSize(),
+            .fillMaxWidth(),
     ) {
-        toolbar(uiState)
-        questionContent(uiState)
-        choices(uiState, onSelect)
-        // Timer below choices
-        if (uiState.selectedChoiceIndex == null && uiState.timerState.totalTimeSeconds > 0) {
-            timer(uiState)
-        } else {
-            continueButton(uiState, onContinue)
-        }
-    }
-}
-
-private fun LazyListScope.toolbar(
-    uiState: ScreenUiState.Success,
-    modifier: Modifier = Modifier,
-) {
-    item(key = "toolbar") {
         Box(
             modifier = modifier
                 .height(72.dp),
@@ -124,25 +106,56 @@ private fun LazyListScope.toolbar(
                 )
             }
         }
-    }
-}
 
-private fun LazyListScope.questionContent(
-    uiState: ScreenUiState.Success,
-) {
-    if (uiState.currentQuestion != null) {
-        item(key = "question_${uiState.currentQuestionIndex}") {
-            QuestionContent(
-                question = uiState.currentQuestion,
-                modifier = Modifier
-                    .padding(horizontal = 8.dp)
-                    .animateItem(),
+        QuestionContent(
+            question = uiState.currentQuestion,
+            modifier = Modifier
+                .padding(horizontal = 8.dp)
+                .fillMaxHeight(0.5f),
+        )
+        Spacer(Modifier.height(8.dp))
+
+
+        Choices(
+            choices = uiState.currentQuestion.choices,
+            selectedChoiceIndex = uiState.selectedChoiceIndex,
+            onSelect = onSelect,
+            modifier = Modifier
+                .padding(8.dp)
+                .weight(1f),
+        )
+
+        // Timer below choices
+        if (uiState.selectedChoiceIndex == null && uiState.timerState.totalTimeSeconds > 0) {
+            TimerBar(
+                totalSeconds = uiState.timerState.totalTimeSeconds,
+                remainingSeconds = uiState.timerState.remainingTimeSeconds,
+                modifier = Modifier.padding(8.dp),
             )
-            Spacer(Modifier.height(8.dp))
+        } else {
+            Box(
+                modifier = Modifier.fillMaxWidth(),
+            ) {
+                FilledTonalButton(
+                    onClick = onContinue,
+                    colors = ButtonDefaults.filledTonalButtonColors().copy(
+                        containerColor = Grey,
+                        contentColor = Color.Black,
+                    ),
+                    shape = RoundedCornerShape(4.dp),
+                    modifier = Modifier.align(Alignment.Center),
+                ) {
+                    Text(
+                        text = stringResource(R.string.continue_text),
+                    )
+                }
+            }
+
         }
     }
 }
 
+
 private fun LazyListScope.timer(uiState: ScreenUiState.Success) {
     item(key = "timer_${uiState.currentQuestionIndex}") {
         TimerBar(
@@ -153,49 +166,6 @@ private fun LazyListScope.timer(uiState: ScreenUiState.Success) {
     }
 }
 
-private fun LazyListScope.continueButton(
-    uiState: ScreenUiState.Success,
-    onContinue: () -> Unit,
-) {
-    item(key = "continue_${uiState.currentQuestionIndex}") {
-        Box(
-            modifier = Modifier.fillMaxWidth(),
-        ) {
-            FilledTonalButton(
-                onClick = onContinue,
-                colors = ButtonDefaults.filledTonalButtonColors().copy(
-                    containerColor = Grey,
-                    contentColor = Color.Black,
-                ),
-                shape = RoundedCornerShape(4.dp),
-                modifier = Modifier.align(Alignment.Center),
-            ) {
-                Text(
-                    text = stringResource(R.string.continue_text),
-                )
-            }
-        }
-    }
-}
-
-private fun LazyListScope.choices(
-    uiState: ScreenUiState.Success,
-    onSelect: (Int) -> Unit,
-) {
-    uiState.currentQuestion?.choices?.let { choicesList ->
-        if (choicesList.isNotEmpty()) {
-            item(key = "choices_${uiState.currentQuestionIndex}") {
-                Choices(
-                    choices = choicesList,
-                    selectedChoiceIndex = uiState.selectedChoiceIndex,
-                    onSelect = onSelect,
-                    modifier = Modifier.padding(8.dp),
-                )
-            }
-        }
-    }
-}
-
 @Preview
 @Composable
 private fun QuizScreenPreview() {

ui/quiz/src/main/kotlin/dev/adriankuta/kahootquiz/ui/quiz/QuizScreenViewModel.kt

@@ -141,9 +141,9 @@ private fun screenUiState(
     when (quizState) {
         QuizUiState.Loading -> ScreenUiState.Loading
         is QuizUiState.Success -> {
-            val currentQuestion = quizState.quiz.questions.getOrNull(currentQuestionIndex)
+            val currentQuestion = quizState.quiz.questions[currentQuestionIndex]
             val isAnswerCorrect = selectedChoiceIndex?.let { idx ->
-                currentQuestion?.choices?.getOrNull(idx)?.correct == true
+                currentQuestion.choices?.getOrNull(idx)?.correct == true
             }
 
             ScreenUiState.Success(
@@ -153,7 +153,7 @@ private fun screenUiState(
                 totalQuestions = quizState.quiz.questions.size,
                 timerState = TimerState(
                     remainingTimeSeconds = remainingTimeSeconds,
-                    totalTimeSeconds = currentQuestion?.time?.inWholeSeconds?.toInt() ?: 0,
+                    totalTimeSeconds = currentQuestion.time?.inWholeSeconds?.toInt() ?: 0,
                 ),
                 isAnswerCorrect = isAnswerCorrect,
             )
@@ -171,7 +171,7 @@ sealed interface QuizUiState {
 sealed interface ScreenUiState {
     data object Loading : ScreenUiState
     data class Success(
-        val currentQuestion: Question? = null,
+        val currentQuestion: Question,
         val selectedChoiceIndex: Int? = null,
         val currentQuestionIndex: Int = 0,
         val totalQuestions: Int = 0,

ui/quiz/src/main/kotlin/dev/adriankuta/kahootquiz/ui/quiz/components/Choices.kt

@@ -1,3 +1,5 @@
+@file:OptIn(ExperimentalLayoutApi::class)
+
 package dev.adriankuta.kahootquiz.ui.quiz.components
 
 import androidx.compose.foundation.Image
@@ -5,8 +7,8 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.FlowRow
-import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
@@ -37,21 +39,22 @@ fun Choices(
     selectedChoiceIndex: Int?,
     modifier: Modifier = Modifier,
 ) {
-    FlowRow(
-        maxItemsInEachRow = 2,
+    EvenGrid(
+        items = choices,
+        columns = 2,
         modifier = modifier,
-        horizontalArrangement = Arrangement.spacedBy(8.dp),
         verticalArrangement = Arrangement.spacedBy(8.dp),
-    ) {
-        choices.forEachIndexed { index, choice ->
-            ChoiceItem(
-                choice = choice,
-                index = index,
-                selectedChoiceIndex = selectedChoiceIndex,
-                onClick = { onSelect(index) },
-                modifier = Modifier.weight(1f),
-            )
-        }
+        horizontalArrangement = Arrangement.spacedBy(8.dp),
+    ) { choice, index ->
+        ChoiceItem(
+            choice = choice,
+            index = index,
+            selectedChoiceIndex = selectedChoiceIndex,
+            onClick = { onSelect(index) },
+            modifier = Modifier
+                .weight(1f)
+                .fillMaxHeight(),
+        )
     }
 }
 
@@ -104,7 +107,6 @@ private fun ChoiceItemDefault(
     Box(
         modifier = modifier
             .background(backgroundColor, shape = RoundedCornerShape(4.dp))
-            .height(100.dp)
             .clickable(
                 onClick = onClick,
             ),
@@ -152,8 +154,7 @@ private fun ChoiceItemRevealed(
 
     Box(
         modifier = modifier
-            .background(backgroundColor, shape = RoundedCornerShape(4.dp))
-            .height(100.dp),
+            .background(backgroundColor, shape = RoundedCornerShape(4.dp)),
     ) {
         Image(
             painter = painterResource(icon),

ui/quiz/src/main/kotlin/dev/adriankuta/kahootquiz/ui/quiz/components/EvenGrid.kt

@@ -0,0 +1,39 @@
+package dev.adriankuta.kahootquiz.ui.quiz.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.RowScope
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+
+@Composable
+fun <T> EvenGrid(
+    items: List<T>,
+    columns: Int,
+    modifier: Modifier = Modifier,
+    verticalArrangement: Arrangement.Vertical = Arrangement.Top,
+    horizontalArrangement: Arrangement.Horizontal = Arrangement.Start,
+    content: @Composable RowScope.(item: T, index: Int) -> Unit,
+) {
+    val rows = (items.size + columns - 1) / columns // total rows needed
+
+    Column(
+        modifier = modifier,
+        verticalArrangement = verticalArrangement,
+    ) {
+        repeat(rows) { rowIndex ->
+            Row(
+                modifier = Modifier.weight(1f),
+                horizontalArrangement = horizontalArrangement,
+            ) {
+                repeat(columns) { columnIndex ->
+                    val itemIndex = rowIndex * columns + columnIndex
+                    if (itemIndex < items.size) {
+                        content(items[itemIndex], itemIndex)
+                    }
+                }
+            }
+        }
+    }
+}

ui/quiz/src/main/kotlin/dev/adriankuta/kahootquiz/ui/quiz/components/QuestionContent.kt

@@ -5,7 +5,6 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Text
@@ -34,8 +33,7 @@ fun QuestionContent(
             contentDescription = question.imageMetadata?.altText,
             contentScale = ContentScale.FillWidth,
             modifier = Modifier
-                .fillMaxWidth()
-                .heightIn(min = 200.dp)
+                .weight(1f)
                 .clip(shape = RoundedCornerShape(4.dp)),
         )
         Spacer(Modifier.height(16.dp))

ui/quiz/src/main/kotlin/dev/adriankuta/kahootquiz/ui/quiz/components/TimerBar.kt

@@ -33,7 +33,7 @@ fun TimerBar(
 
     Box(
         modifier = modifier
-            .fillMaxWidth(progress.coerceIn(0f, 1f))
+            .fillMaxWidth(progress)
             .background(
                 color = Purple,
                 shape = RoundedCornerShape(percent = 50),