feat: Implement interactive quiz screen with answer revealed state

This commit enhances the `QuizScreen` to be interactive, allowing users to select choices and view revealed answers. It also introduces HTML parsing for question text and adds new design elements like icons and colors.

Key changes:

- **UI Layer (`ui:quiz` module):**
    - `QuizScreen`:
        - Now takes an `onSelect` callback to handle choice selection.
        - `Choices` composable updated to display choices in a `LazyVerticalGrid` and handles click events.
        - Introduced `ChoiceItem` which branches into `ChoiceItemDefault` (for selectable choices) and `ChoiceItemRevealed` (for displaying correct/incorrect answers).
        - `ChoiceItemDefault` displays choices with background colors and icons based on their index.
        - `ChoiceItemRevealed` displays choices with background colors indicating correctness (green for correct, red for incorrect selected, pink for incorrect unselected) and appropriate icons (tick for correct, cross for wrong).
        - `QuestionContent` now parses HTML in the question text using `HtmlCompat` and a new `toAnnotatedString` extension.
        - Image loading in `QuestionContent` uses `ContentScale.FillWidth` and `heightIn(min = 200.dp)`.
        - Added a new preview `QuizScreenRevealedAnswerPreview` to showcase the revealed answer state.
    - `QuizScreenViewModel`:
        - Now manages `_selectedChoiceIndex` to track the user's answer.
        - `uiState` is now a combination of the fetched quiz and the `_selectedChoiceIndex`, producing `QuizUiState` which includes an `AnswerUiState`.
        - `AnswerUiState` holds the `selectedChoiceIndex`.
        - Implemented `onChoiceSelected(index: Int)` to update the selected choice.
- **Design System (`core:designsystem` module):**
    - Added `TextUtils.kt` with a `Spanned.toAnnotatedString()` extension function to convert HTML formatted text (from `HtmlCompat`) into Jetpack Compose `AnnotatedString`.
    - Added new color definitions: `Pink`, `Red`, `Red2`, `Blue2`, `Yellow3`, `Green`, `Green2`.
    - Added a `contrastiveTo(color: Color)` utility function to determine a contrasting text color (black or white) for a given background color.
    - Added new vector drawables for choice shapes and correctness indicators:
        - `ic_circle.xml`
        - `ic_correct.xml`
        - `ic_diamond.xml`
        - `ic_square.xml`
        - `ic_triangle.xml`
        - `ic_wrong.xml`
    - Added Detekt configuration file (`config/detekt/detekt.yml`) for the design system module.
- **Domain Layer (`domain` module):**
    - `Question.image` is now nullable (`String?`).
    - `Choice.correct` is now non-nullable (`Boolean`).
- **Network Layer (`core:network` module):**
    - `ChoiceDto.correct` is now non-nullable (`Boolean`) to align with the domain model.
- **Project Configuration:**
    - Added `.editorconfig` with Kotlin specific trailing comma settings.
    - Minor reordering of dependencies in `gradle/libs.versions.toml`.

.editorconfig

@@ -0,0 +1,4 @@
+[*.{kt,kts}]
+ij_kotlin_allow_trailing_comma = true
+ij_kotlin_allow_trailing_comma_on_call_site = true
+

core/designsystem/config/detekt/detekt.yml

@@ -0,0 +1,33 @@
+# Exceptions for compose. See https://detekt.dev/docs/introduction/compose
+naming:
+  FunctionNaming:
+    functionPattern: '[a-zA-Z][a-zA-Z0-9]*'
+
+  TopLevelPropertyNaming:
+    constantPattern: '[A-Z][A-Za-z0-9]*'
+
+complexity:
+  LongParameterList:
+    ignoreAnnotated: ['Composable']
+  TooManyFunctions:
+    ignoreAnnotatedFunctions: ['Preview']
+
+style:
+  MagicNumber:
+    ignorePropertyDeclaration: true
+    ignoreCompanionObjectPropertyDeclaration: true
+    ignoreAnnotated: ['Composable']
+
+  UnusedPrivateMember:
+    ignoreAnnotated: ['Composable']
+
+# Deviations from defaults
+formatting:
+  TrailingCommaOnCallSite:
+    active: true
+    autoCorrect: true
+    useTrailingCommaOnCallSite: true
+  TrailingCommaOnDeclarationSite:
+    active: true
+    autoCorrect: true
+    useTrailingCommaOnDeclarationSite: true

core/designsystem/src/main/kotlin/dev/adriankuta/kahootquiz/core/designsystem/Color.kt

@@ -1,6 +1,15 @@
 package dev.adriankuta.kahootquiz.core.designsystem
 
+import androidx.compose.runtime.Composable
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.luminance
+
+@Composable
+fun contrastiveTo(color: Color): Color = if (color.luminance() < 0.5) {
+    Color.White
+} else {
+    Color.Black
+}
 
 val Purple80 = Color(0xFFD0BCFF)
 val PurpleGrey80 = Color(0xFFCCC2DC)
@@ -10,4 +19,11 @@ val Purple40 = Color(0xFF6650a4)
 val PurpleGrey40 = Color(0xFF625b71)
 val Pink40 = Color(0xFF7D5260)
 
-val Grey = Color(0xFFFAFAFA)
+val Grey = Color(0xFFFAFAFA)
+val Pink = Color(0xFFFF99AA)
+val Red = Color(0xFFFF3355)
+val Red2 = Color(0xFFE21B3C)
+val Blue2 = Color(0xFF1368CE)
+val Yellow3 = Color(0xFFD89E00)
+val Green = Color(0xFF66BF39)
+val Green2 = Color(0xFF26890C)

core/designsystem/src/main/kotlin/dev/adriankuta/kahootquiz/core/designsystem/TextUtils.kt

@@ -0,0 +1,48 @@
+package dev.adriankuta.kahootquiz.core.designsystem
+
+import android.graphics.Typeface
+import android.text.Spanned
+import android.text.style.ForegroundColorSpan
+import android.text.style.StyleSpan
+import android.text.style.UnderlineSpan
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextDecoration
+
+fun Spanned.toAnnotatedString(): AnnotatedString = buildAnnotatedString {
+    val spanned = this@toAnnotatedString
+    append(spanned.toString())
+    getSpans(0, spanned.length, Any::class.java).forEach { span ->
+        val start = getSpanStart(span)
+        val end = getSpanEnd(span)
+        when (span) {
+            is StyleSpan -> when (span.style) {
+                Typeface.BOLD -> addStyle(SpanStyle(fontWeight = FontWeight.Bold), start, end)
+                Typeface.ITALIC -> addStyle(SpanStyle(fontStyle = FontStyle.Italic), start, end)
+                Typeface.BOLD_ITALIC -> addStyle(
+                    SpanStyle(
+                        fontWeight = FontWeight.Bold,
+                        fontStyle = FontStyle.Italic,
+                    ),
+                    start, end,
+                )
+            }
+
+            is UnderlineSpan -> addStyle(
+                SpanStyle(textDecoration = TextDecoration.Underline),
+                start,
+                end,
+            )
+
+            is ForegroundColorSpan -> addStyle(
+                SpanStyle(color = Color(span.foregroundColor)),
+                start,
+                end,
+            )
+        }
+    }
+}

core/designsystem/src/main/res/drawable/ic_circle.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="40dp"
+    android:height="40dp"
+    android:viewportWidth="40"
+    android:viewportHeight="40">
+  <path
+      android:pathData="M20,10C14.477,10 10,14.477 10,20C10,25.523 14.477,30 20,30C25.523,30 30,25.523 30,20C30,14.477 25.523,10 20,10Z"
+      android:fillColor="#ffffff"/>
+  <path
+      android:strokeWidth="1"
+      android:pathData="M20,9.5C25.799,9.5 30.5,14.201 30.5,20C30.5,25.799 25.799,30.5 20,30.5C14.201,30.5 9.5,25.799 9.5,20C9.5,14.201 14.201,9.5 20,9.5Z"
+      android:strokeAlpha="0.15"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+</vector>

core/designsystem/src/main/res/drawable/ic_correct.xml

@@ -0,0 +1,24 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="40dp"
+    android:height="40dp"
+    android:viewportWidth="40"
+    android:viewportHeight="40">
+  <path
+      android:pathData="M20,20m-16,0a16,16 0,1 1,32 0a16,16 0,1 1,-32 0"
+      android:strokeWidth="2"
+      android:fillColor="#67BF38"
+      android:strokeColor="#26890C"/>
+  <path
+      android:pathData="M25.237,12.219L28.298,14.723L18.157,27.123L11.651,21.662L14.296,18.722L17.722,21.409L25.237,12.219Z"
+      android:fillColor="#ffffff"/>
+  <path
+      android:strokeWidth="1"
+      android:pathData="M25.554,11.831L28.615,14.336L29.001,14.653L28.685,15.039L18.545,27.44L18.224,27.832L17.836,27.507L11.33,22.045L10.933,21.713L11.279,21.328L13.925,18.388L14.237,18.041L14.604,18.329L17.645,20.713L24.85,11.902L25.167,11.515L25.554,11.831Z"
+      android:strokeAlpha="0.15"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+  <group>
+    <clip-path
+        android:pathData="M25.237,12.219L28.298,14.723L18.157,27.123L11.651,21.662L14.296,18.722L17.722,21.409L25.237,12.219ZM25.554,11.831L28.615,14.336L29.001,14.653L28.685,15.039L18.545,27.44L18.224,27.832L17.836,27.507L11.33,22.045L10.933,21.713L11.279,21.328L13.925,18.388L14.237,18.041L14.604,18.329L17.645,20.713L24.85,11.902L25.167,11.515L25.554,11.831Z"/>
+  </group>
+</vector>

core/designsystem/src/main/res/drawable/ic_diamond.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="40dp"
+    android:height="40dp"
+    android:viewportWidth="40"
+    android:viewportHeight="40">
+  <path
+      android:pathData="M20,8.75L8.75,20.004L20,31.25L31.25,20.001L20,8.75Z"
+      android:fillColor="#ffffff"/>
+  <path
+      android:strokeWidth="1"
+      android:pathData="M20.354,8.396L31.604,19.647L31.957,20.001L31.604,20.354L20.354,31.604L20,31.957L19.646,31.604L8.396,20.357L8.043,20.004L8.396,19.65L19.646,8.396L20,8.043L20.354,8.396Z"
+      android:strokeAlpha="0.15"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+</vector>

core/designsystem/src/main/res/drawable/ic_square.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="40dp"
+    android:height="41dp"
+    android:viewportWidth="40"
+    android:viewportHeight="41">
+  <path
+      android:pathData="M28.75,11.476H11.25V28.976H28.75V11.476Z"
+      android:fillColor="#ffffff"/>
+  <path
+      android:strokeWidth="1"
+      android:pathData="M29.25,10.976V29.476H10.75V10.976H29.25Z"
+      android:strokeAlpha="0.15"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+</vector>

core/designsystem/src/main/res/drawable/ic_triangle.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="40dp"
+    android:height="40dp"
+    android:viewportWidth="40"
+    android:viewportHeight="40">
+  <path
+      android:pathData="M20,11.25L8.75,28.75H31.25L20,11.25Z"
+      android:fillColor="#ffffff"/>
+  <path
+      android:strokeWidth="1"
+      android:pathData="M20.421,10.979L31.671,28.479L32.166,29.25H7.834L8.329,28.479L19.579,10.979L20,10.325L20.421,10.979Z"
+      android:strokeAlpha="0.15"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+</vector>

core/designsystem/src/main/res/drawable/ic_wrong.xml

@@ -0,0 +1,35 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="40dp"
+    android:height="40dp"
+    android:viewportWidth="40"
+    android:viewportHeight="40">
+  <path
+      android:pathData="M20,20m-16,0a16,16 0,1 1,32 0a16,16 0,1 1,-32 0"
+      android:fillColor="#FF3355"/>
+  <path
+      android:pathData="M20,20m-16,0a16,16 0,1 1,32 0a16,16 0,1 1,-32 0"
+      android:strokeWidth="2"
+      android:fillColor="#00000000"
+      android:strokeColor="#FF3355"/>
+  <path
+      android:pathData="M20,20m-16,0a16,16 0,1 1,32 0a16,16 0,1 1,-32 0"
+      android:strokeAlpha="0.15"
+      android:strokeWidth="2"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+  <path
+      android:pathData="M12.04,24.636L15.355,27.95L19.995,23.31L24.636,27.95L27.95,24.636L23.31,19.995L27.95,15.355L24.636,12.04L19.995,16.681L15.355,12.04L12.04,15.355L16.681,19.995L12.04,24.636Z"
+      android:fillColor="#ffffff"
+      android:fillType="evenOdd"/>
+  <group>
+    <clip-path
+        android:pathData="M5.853,5.721h28.284v28.284h-28.284z"/>
+    <clip-path
+        android:pathData="M12.04,24.636L15.355,27.95L19.995,23.31L24.636,27.95L27.95,24.636L23.31,19.995L27.95,15.355L24.636,12.04L19.995,16.681L15.355,12.04L12.04,15.355L16.681,19.995L12.04,24.636Z"
+        android:fillType="evenOdd"/>
+    <path
+        android:pathData="M15.355,27.95L14.648,28.657L15.355,29.365L16.062,28.657L15.355,27.95ZM12.04,24.636L11.333,23.929L10.626,24.636L11.333,25.343L12.04,24.636ZM19.995,23.31L20.702,22.603L19.995,21.896L19.288,22.603L19.995,23.31ZM24.636,27.95L23.929,28.657L24.636,29.365L25.343,28.657L24.636,27.95ZM27.95,24.636L28.657,25.343L29.365,24.636L28.657,23.929L27.95,24.636ZM23.31,19.995L22.603,19.288L21.896,19.995L22.603,20.702L23.31,19.995ZM27.95,15.355L28.657,16.062L29.365,15.355L28.657,14.648L27.95,15.355ZM24.636,12.04L25.343,11.333L24.636,10.626L23.929,11.333L24.636,12.04ZM19.995,16.681L19.288,17.388L19.995,18.095L20.702,17.388L19.995,16.681ZM15.355,12.04L16.062,11.333L15.355,10.626L14.648,11.333L15.355,12.04ZM12.04,15.355L11.333,14.648L10.626,15.355L11.333,16.062L12.04,15.355ZM16.681,19.995L17.388,20.702L18.095,19.995L17.388,19.288L16.681,19.995ZM16.062,27.243L12.748,23.929L11.333,25.343L14.648,28.657L16.062,27.243ZM19.288,22.603L14.648,27.243L16.062,28.657L20.702,24.017L19.288,22.603ZM25.343,27.243L20.702,22.603L19.288,24.017L23.929,28.657L25.343,27.243ZM27.243,23.929L23.929,27.243L25.343,28.657L28.657,25.343L27.243,23.929ZM22.603,20.702L27.243,25.343L28.657,23.929L24.017,19.288L22.603,20.702ZM27.243,14.648L22.603,19.288L24.017,20.702L28.657,16.062L27.243,14.648ZM23.929,12.748L27.243,16.062L28.657,14.648L25.343,11.333L23.929,12.748ZM20.702,17.388L25.343,12.748L23.929,11.333L19.288,15.974L20.702,17.388ZM14.648,12.748L19.288,17.388L20.702,15.974L16.062,11.333L14.648,12.748ZM12.748,16.062L16.062,12.748L14.648,11.333L11.333,14.648L12.748,16.062ZM17.388,19.288L12.748,14.648L11.333,16.062L15.974,20.702L17.388,19.288ZM12.748,25.343L17.388,20.702L15.974,19.288L11.333,23.929L12.748,25.343Z"
+        android:fillColor="#000000"
+        android:fillAlpha="0.15"/>
+  </group>
+</vector>

core/network/src/main/kotlin/dev/adriankuta/kahootquiz/core/network/models/QuestionDtos.kt

@@ -24,7 +24,7 @@ data class QuestionDto(
 
 data class ChoiceDto(
     val answer: String?,
-    val correct: Boolean?,
+    val correct: Boolean,
     val languageInfo: LanguageInfoDto?
 )
 

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

@@ -2,6 +2,6 @@ package dev.adriankuta.kahootquiz.domain.models
 
 data class Choice(
     val answer: String?,
-    val correct: Boolean?,
+    val correct: Boolean,
     val languageInfo: LanguageInfo? = null
 )

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

@@ -12,12 +12,12 @@ data class Question(
     val pointsMultiplier: Int?,
     val choices: List<Choice>?,
     val layout: String? = null,
-    val image: String,
+    val image: String? = null,
     val imageMetadata: ImageMetadata?,
     val resources: String? = null,
     val video: Video? = null,
     val questionFormat: Int? = null,
     val languageInfo: LanguageInfo? = null,
     val media: List<MediaItem>? = null,
-    val choiceRange: ChoiceRange? = null
+    val choiceRange: ChoiceRange? = null,
 )

gradle/libs.versions.toml

@@ -1,7 +1,4 @@
 [versions]
-coilCompose = "3.3.0"
-coilNetworkOkhttp = "3.3.0"
-retrofit = "3.0.0"
 targetSdk = "36"
 compileSdk = "36"
 minSdk = "23"
@@ -23,6 +20,8 @@ animation = "1.9.0"
 appUpdateKtx = "2.1.0"
 appcompat = "1.7.1"
 billing = "8.0.0"
+coilCompose = "3.3.0"
+coilNetworkOkhttp = "3.3.0"
 coreTest = "1.7.0" # https://developer.android.com/jetpack/androidx/releases/test
 datastorePreferences = "1.1.7" # https://developer.android.com/topic/libraries/architecture/datastore#preferences-datastore-dependencies
 datetime = "0.7.1" # https://github.com/Kotlin/kotlinx-datetime/releases
@@ -48,6 +47,7 @@ material = "1.12.0"
 materialIconsExtended = "1.7.8"
 mockk = "1.14.5" # https://github.com/mockk/mockk/releases
 playServicesAds = "24.5.0"
+retrofit = "3.0.0"
 reviewKtx = "2.0.2"
 room = "2.7.2"
 secrets = "2.0.1"

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

@@ -2,17 +2,24 @@ package dev.adriankuta.kahootquiz.ui.quiz
 
 import androidx.compose.foundation.Image
 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.Column
+import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.lazy.grid.itemsIndexed
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -26,11 +33,21 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
+import androidx.core.text.HtmlCompat
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import coil3.compose.AsyncImage
+import dev.adriankuta.kahootquiz.core.designsystem.Blue2
+import dev.adriankuta.kahootquiz.core.designsystem.Green
+import dev.adriankuta.kahootquiz.core.designsystem.Green2
 import dev.adriankuta.kahootquiz.core.designsystem.Grey
 import dev.adriankuta.kahootquiz.core.designsystem.KahootQuizTheme
+import dev.adriankuta.kahootquiz.core.designsystem.Pink
+import dev.adriankuta.kahootquiz.core.designsystem.Red
+import dev.adriankuta.kahootquiz.core.designsystem.Red2
+import dev.adriankuta.kahootquiz.core.designsystem.Yellow3
+import dev.adriankuta.kahootquiz.core.designsystem.contrastiveTo
+import dev.adriankuta.kahootquiz.core.designsystem.toAnnotatedString
 import dev.adriankuta.kahootquiz.domain.models.Choice
 import dev.adriankuta.kahootquiz.domain.models.Question
 import kotlin.time.Duration.Companion.seconds
@@ -39,20 +56,22 @@ import dev.adriankuta.kahootquiz.core.designsystem.R as DesignR
 @Composable
 fun QuizScreen(
     modifier: Modifier = Modifier,
-    viewModel: QuizScreenViewModel = hiltViewModel()
+    viewModel: QuizScreenViewModel = hiltViewModel(),
 ) {
 
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
 
     QuizScreen(
         uiState = uiState,
-        modifier = modifier.fillMaxSize()
+        onSelect = viewModel::onChoiceSelected,
+        modifier = modifier.fillMaxSize(),
     )
 }
 
 @Composable
 private fun QuizScreen(
     uiState: QuizUiState,
+    onSelect: (Int) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     Box(modifier.fillMaxSize()) {
@@ -60,23 +79,27 @@ private fun QuizScreen(
             painter = painterResource(id = DesignR.drawable.bg_image),
             contentDescription = null,
             contentScale = ContentScale.Crop,
-            modifier = Modifier.fillMaxSize()
+            modifier = Modifier.fillMaxSize(),
         )
         Column(
-            modifier = Modifier.fillMaxSize()
+            modifier = Modifier
+                .fillMaxWidth(),
         ) {
             Toolbar(
                 modifier = Modifier
                     .fillMaxWidth()
                     .height(72.dp)
-                    .padding(8.dp)
+                    .padding(8.dp),
             )
             QuestionContent(
                 question = uiState.currentQuestion ?: return,
-                modifier = Modifier.padding(horizontal = 8.dp)
+                modifier = Modifier.padding(horizontal = 8.dp),
             )
+            Spacer(Modifier.height(8.dp))
             Choices(
-                choices = uiState.currentQuestion.choices ?: emptyList() // TODO remove empty list
+                choices = uiState.currentQuestion.choices ?: emptyList(), // TODO remove empty list
+                answer = uiState.answer,
+                onSelect = onSelect,
             )
         }
     }
@@ -84,10 +107,10 @@ private fun QuizScreen(
 
 @Composable
 private fun Toolbar(
-    modifier: Modifier = Modifier
+    modifier: Modifier = Modifier,
 ) {
     Box(
-        modifier = modifier
+        modifier = modifier,
     ) {
         Text(
             text = "2/24",
@@ -95,9 +118,9 @@ private fun Toolbar(
                 .align(Alignment.CenterStart)
                 .background(
                     color = Grey,
-                    shape = RoundedCornerShape(60.dp)
+                    shape = RoundedCornerShape(60.dp),
                 )
-                .padding(horizontal = 8.dp, vertical = 4.dp)
+                .padding(horizontal = 8.dp, vertical = 4.dp),
         )
 
         Row(
@@ -105,14 +128,14 @@ private fun Toolbar(
                 .align(Alignment.Center)
                 .background(
                     color = Grey,
-                    shape = RoundedCornerShape(60.dp)
+                    shape = RoundedCornerShape(60.dp),
                 )
-                .padding(horizontal = 8.dp, vertical = 4.dp)
+                .padding(horizontal = 8.dp, vertical = 4.dp),
         ) {
             Image(
                 painter = painterResource(id = DesignR.drawable.ic_type),
                 contentDescription = "",
-                modifier = Modifier.size(24.dp)
+                modifier = Modifier.size(24.dp),
             )
             Spacer(Modifier.width(4.dp))
             Text(
@@ -128,38 +151,175 @@ private fun QuestionContent(
     modifier: Modifier = Modifier,
 ) {
     Column(
-        modifier = modifier
+        modifier = modifier,
     ) {
         AsyncImage(
             model = question.image,
             contentDescription = question.imageMetadata?.altText,
-            contentScale = ContentScale.Crop,
+            contentScale = ContentScale.FillWidth,
             modifier = Modifier
                 .fillMaxWidth()
-                .height(200.dp)
+                .heightIn(min = 200.dp),
         )
         Spacer(Modifier.height(16.dp))
         Text(
-            text = question.question ?: "",
+            text = HtmlCompat.fromHtml(
+                question.question ?: "",
+                HtmlCompat.FROM_HTML_MODE_COMPACT,
+            ).toAnnotatedString(),
             textAlign = TextAlign.Center,
             modifier = Modifier
                 .fillMaxWidth()
                 .background(
                     color = Color.White,
-                    shape = RoundedCornerShape(4.dp)
+                    shape = RoundedCornerShape(4.dp),
                 )
-                .padding(horizontal = 8.dp, vertical = 16.dp)
+                .padding(horizontal = 8.dp, vertical = 16.dp),
         )
     }
 }
 
 @Composable
 private fun Choices(
-    choices: List<Choice>
+    choices: List<Choice>,
+    onSelect: (Int) -> Unit,
+    answer: AnswerUiState?,
+    modifier: Modifier = Modifier,
 ) {
-    LazyVerticalGrid() { }
+    LazyVerticalGrid(
+        columns = GridCells.Fixed(2),
+        contentPadding = PaddingValues(8.dp),
+        horizontalArrangement = Arrangement.spacedBy(8.dp),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+        modifier = modifier,
+    ) {
+        itemsIndexed(choices) { index, choice ->
+            ChoiceItem(
+                choice = choice,
+                index = index,
+                answer = answer,
+                onClick = { onSelect(index) },
+            )
+        }
+    }
 }
 
+@Composable
+private fun ChoiceItem(
+    choice: Choice,
+    onClick: () -> Unit,
+    index: Int,
+    answer: AnswerUiState?,
+) {
+    if (answer != null) {
+        ChoiceItemRevealed(
+            choice = choice,
+            index = index,
+            isSelected = answer.selectedChoiceIndex == index,
+        )
+    } else {
+        ChoiceItemDefault(
+            choice = choice,
+            index = index,
+            onClick = onClick,
+        )
+    }
+}
+
+@Composable
+private fun ChoiceItemDefault(
+    choice: Choice,
+    index: Int,
+    onClick: () -> Unit,
+) {
+    val backgroundColor = when (index) {
+        0 -> Red2
+        1 -> Blue2
+        2 -> Yellow3
+        3 -> Green2
+        else -> Color.Gray
+    }
+
+    // TODO Add icons
+    val icon = when (index) {
+        0 -> DesignR.drawable.ic_triangle
+        1 -> DesignR.drawable.ic_diamond
+        2 -> DesignR.drawable.ic_circle
+        else -> DesignR.drawable.ic_square
+    }
+    Box(
+        modifier = Modifier
+            .background(backgroundColor, shape = RoundedCornerShape(4.dp))
+            .height(100.dp)
+            .clickable(
+                onClick = onClick,
+            ),
+    ) {
+        Image(
+            painter = painterResource(id = icon),
+            contentDescription = null,
+            modifier = Modifier
+                .padding(8.dp)
+                .size(32.dp),
+        )
+        Text(
+            text = choice.answer ?: "",
+            textAlign = TextAlign.Center,
+            modifier = Modifier.align(Alignment.Center),
+            color = contrastiveTo(backgroundColor),
+        )
+    }
+}
+
+@Composable
+private fun ChoiceItemRevealed(
+    choice: Choice,
+    index: Int,
+    isSelected: Boolean,
+) {
+    val backgroundColor = when {
+        isSelected && !choice.correct -> Red
+        choice.correct -> Green
+        else -> Pink
+    }
+
+    val icon = if (choice.correct) {
+        DesignR.drawable.ic_correct
+    } else {
+        DesignR.drawable.ic_wrong
+    }
+
+    val alignment = if (index % 2 == 0) {
+        Alignment.TopStart
+    } else {
+        Alignment.TopEnd
+    }
+
+    Box(
+        modifier = Modifier
+            .background(backgroundColor, shape = RoundedCornerShape(4.dp))
+            .height(100.dp),
+    ) {
+        Image(
+            painter = painterResource(icon),
+            contentDescription = null,
+            modifier = Modifier
+                .align(alignment)
+                .offset(
+                    x = if (alignment == Alignment.TopStart) (-8).dp else (8).dp,
+                    (-8).dp,
+                ),
+        )
+        Text(
+            text = choice.answer ?: "",
+            textAlign = TextAlign.Center,
+            modifier = Modifier.align(Alignment.Center),
+            color = contrastiveTo(backgroundColor),
+        )
+    }
+}
+
+
 @Preview
 @Composable
 private fun QuizScreenPreview() {
@@ -172,7 +332,7 @@ private fun QuizScreenPreview() {
                 Choice(answer = "Berlin", correct = false),
                 Choice(answer = "Madrid", correct = false),
                 Choice(answer = "Paris", correct = true),
-                Choice(answer = "Rome", correct = false)
+                Choice(answer = "Rome", correct = false),
             ),
             pointsMultiplier = 1,
             time = 30.seconds,
@@ -180,7 +340,41 @@ private fun QuizScreenPreview() {
             imageMetadata = null,
         )
         QuizScreen(
-            uiState = QuizUiState(currentQuestion = sampleQuestion)
+            uiState = QuizUiState(
+                currentQuestion = sampleQuestion,
+            ),
+            onSelect = {},
+        )
+    }
+}
+
+@Preview
+@Composable
+private fun QuizScreenRevealedAnswerPreview() {
+    KahootQuizTheme {
+        val sampleQuestion = Question(
+            type = "quiz",
+            image = "", // Add a sample image URL or leave empty
+            question = "What is the capital of France?",
+            choices = listOf(
+                Choice(answer = "Berlin", correct = false),
+                Choice(answer = "Madrid", correct = false),
+                Choice(answer = "Paris", correct = true),
+                Choice(answer = "Rome", correct = false),
+            ),
+            pointsMultiplier = 1,
+            time = 30.seconds,
+            questionFormat = 0,
+            imageMetadata = null,
+        )
+        QuizScreen(
+            uiState = QuizUiState(
+                currentQuestion = sampleQuestion,
+                answer = AnswerUiState(
+                    selectedChoiceIndex = 1,
+                ),
+            ),
+            onSelect = {},
         )
     }
 }

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

@@ -6,26 +6,42 @@ import dagger.hilt.android.lifecycle.HiltViewModel
 import dev.adriankuta.kahootquiz.domain.models.Question
 import dev.adriankuta.kahootquiz.domain.usecases.GetQuizUseCase
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.asFlow
-import kotlinx.coroutines.launch
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.stateIn
 import javax.inject.Inject
 
 @HiltViewModel
 class QuizScreenViewModel @Inject constructor(
-    private val getQuizUseCase: GetQuizUseCase
+    private val getQuizUseCase: GetQuizUseCase,
 ) : ViewModel() {
-    private val _uiState = MutableStateFlow(QuizUiState())
+    private val _selectedChoiceIndex = MutableStateFlow<Int?>(null)
-    val uiState: StateFlow<QuizUiState> = _uiState.asStateFlow()
+    val uiState: StateFlow<QuizUiState> = combine(
+        suspend { getQuizUseCase() }.asFlow(),
+        _selectedChoiceIndex,
+    ) { quiz, selectedChoiceIndex ->
+        QuizUiState(
+            currentQuestion = quiz.questions.first(),
+            answer = selectedChoiceIndex?.let { AnswerUiState(it) },
+        )
+    }.stateIn(
+        scope = viewModelScope,
+        started = SharingStarted.WhileSubscribed(5000),
+        initialValue = QuizUiState(),
+    )
 
-    init {
+    fun onChoiceSelected(index: Int) {
-        viewModelScope.launch {
+        _selectedChoiceIndex.value = index
-            _uiState.value = QuizUiState(getQuizUseCase().questions.first())
-        }
     }
-
 }
 
 data class QuizUiState(
-    val currentQuestion: Question? = null
+    val currentQuestion: Question? = null,
-)
+    val answer: AnswerUiState? = null,
+)
+
+data class AnswerUiState(
+    val selectedChoiceIndex: Int,
+)