feat: Expand domain models and implement full DTO to domain mapping

This commit significantly expands the domain models to fully represent the quiz structure and implements the complete mapping logic in `QuizMapper` to convert `QuizResponseDto` and its nested DTOs to their corresponding domain models.

Key changes:

- **Domain Layer (`domain` module):**
    - Introduced a `QuizId` value class for type safety.
    - Added comprehensive domain models for all aspects of a quiz, including:
        - `Quiz`: Updated to include all fields from the DTO.
        - `Question`, `Choice`, `Video`, `ImageMetadata`, `MediaItem`, `ChoiceRange`: For question details.
        - `CoverMetadata`, `ExtractedColor`, `Crop`, `Point`: For cover image information.
        - `ContentTags`: For curriculum and generated codes.
        - `Metadata`, `Access`, `FeaturedListMembership`, `LastEdit`, `VersionMetadata`: For quiz metadata.
        - `LanguageInfo`, `Channel`: Common reusable models.
    - Organized domain models into separate files for better maintainability (e.g., `Question.kt`, `CoverMetadata.kt`).
    - Added a placeholder `QuestionModels.kt` to indicate that models were moved.
- **Data Layer (`model:data` module):**
    - Implemented a complete `toDomainModel()` extension function in `QuizMapper.kt` to map all fields from `QuizResponseDto` and its nested DTOs (like `CoverMetadataDto`, `QuestionDto`, etc.) to the new domain models.
    - This includes mapping for lists and nullable fields.
- **App Module (`app` module):**
    - Updated `MainActivity` to access `quizId.value` due to `QuizId` being a value class.
- **Network Layer (`core:network` module):**
    - Changed `QuizResponseDto.uuid` to be non-nullable (`String`) as it's essential for mapping to `QuizId`.
    - Removed `QuizResponse.kt` as DTOs were previously split into individual files.

.idea/deploymentTargetSelector.xml

@@ -4,10 +4,10 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
-        <DropdownSelection timestamp="2025-09-01T13:50:36.976965Z">
+        <DropdownSelection timestamp="2025-09-02T20:25:37.879520Z">
           <Target type="DEFAULT_BOOT">
             <handle>
-              <DeviceId pluginId="LocalEmulator" identifier="path=/Users/adriankuta/.android/avd/Pixel_8_Pro.avd" />
+              <DeviceId pluginId="LocalEmulator" identifier="path=/Users/adriankuta/.android/avd/Pixel_9_Pro.avd" />
             </handle>
           </Target>
         </DropdownSelection>

.idea/gradle.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
@@ -24,6 +25,13 @@
             <option value="$PROJECT_DIR$/app" />
             <option value="$PROJECT_DIR$/build-logic" />
             <option value="$PROJECT_DIR$/build-logic/convention" />
+            <option value="$PROJECT_DIR$/core" />
+            <option value="$PROJECT_DIR$/core/network" />
+            <option value="$PROJECT_DIR$/domain" />
+            <option value="$PROJECT_DIR$/model" />
+            <option value="$PROJECT_DIR$/model/data" />
+            <option value="$PROJECT_DIR$/ui" />
+            <option value="$PROJECT_DIR$/ui/quiz" />
           </set>
         </option>
       </GradleProjectSettings>

app/src/main/java/dev/adriankuta/kahootquiz/MainActivity.kt

@@ -37,7 +37,7 @@ class MainActivity : ComponentActivity() {
                     var quizId by remember { mutableStateOf<String?>(null) }
 
                     LaunchedEffect(Unit) {
-                        quizId = getQuizUseCase().id
+                        quizId = getQuizUseCase().id.value
                     }
 
                     Greeting(

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

@@ -1,10 +0,0 @@
-package dev.adriankuta.kahootquiz.core.network.models
-
-// This file used to contain all DTOs in one place.
-// The DTOs have been split into separate files for maintainability:
-// - QuizResponseDto.kt
-// - CommonDtos.kt
-// - CoverDtos.kt
-// - QuestionDtos.kt
-// - MetadataDtos.kt
-// Keeping this file as a placeholder to avoid breaking any imports by file path (package remains the same).

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

@@ -4,7 +4,7 @@ import com.google.gson.annotations.SerializedName
 
 // Root response for a Kahoot quiz details (network layer DTO)
 data class QuizResponseDto(
-    val uuid: String?,
+    val uuid: String,
     val language: String?,
     val creator: String?,
     @SerializedName("creator_username") val creatorUsername: String?,

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

@@ -0,0 +1,9 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Access settings
+
+data class Access(
+    val groupRead: List<String>?,
+    val folderGroupIds: List<String>?,
+    val features: List<String>?
+)

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

@@ -0,0 +1,5 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Minimal channel info
+
+data class Channel(val id: String?)

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

@@ -0,0 +1,7 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+data class Choice(
+    val answer: String?,
+    val correct: Boolean?,
+    val languageInfo: LanguageInfo?
+)

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

@@ -0,0 +1,11 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Slider range for "slider" question type
+
+data class ChoiceRange(
+    val start: Int?,
+    val end: Int?,
+    val step: Int?,
+    val correct: Int?,
+    val tolerance: Int?
+)

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

@@ -0,0 +1,8 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Content tags domain model
+
+data class ContentTags(
+    val curriculumCodes: List<String>?,
+    val generatedCurriculumCodes: List<String>?
+)

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

@@ -0,0 +1,17 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Cover metadata and related domain models
+
+data class CoverMetadata(
+    val id: String?,
+    val altText: String?,
+    val contentType: String?,
+    val origin: String?,
+    val externalRef: String?,
+    val resources: String?,
+    val width: Int?,
+    val height: Int?,
+    val extractedColors: List<ExtractedColor>?,
+    val blurhash: String?,
+    val crop: Crop?
+)

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

@@ -0,0 +1,9 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Crop descriptor
+
+data class Crop(
+    val origin: Point?,
+    val target: Point?,
+    val circular: Boolean?
+)

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

@@ -0,0 +1,8 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Color extracted from cover image
+
+data class ExtractedColor(
+    val swatch: String?,
+    val rgbHex: String?
+)

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

@@ -0,0 +1,8 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Featured list membership
+
+data class FeaturedListMembership(
+    val list: String?,
+    val addedAt: Long?
+)

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

@@ -0,0 +1,16 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Image metadata appearing in multiple places
+
+data class ImageMetadata(
+    val id: String?,
+    val altText: String? = null,
+    val contentType: String?,
+    val origin: String? = null,
+    val externalRef: String? = null,
+    val resources: String? = null,
+    val width: Int? = null,
+    val height: Int? = null,
+    val effects: List<String>? = null,
+    val crop: Crop? = null
+)

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

@@ -0,0 +1,9 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Common simple models reused across the domain layer
+
+data class LanguageInfo(
+    val language: String?,
+    val lastUpdatedOn: Long?,
+    val readAloudSupported: Boolean?
+)

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

@@ -0,0 +1,9 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Last edit information
+
+data class LastEdit(
+    val editorUserId: String?,
+    val editorUsername: String?,
+    val editTimestamp: Long?
+)

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

@@ -0,0 +1,18 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Generic media item on question
+
+data class MediaItem(
+    val type: String?,
+    val zIndex: Int?,
+    val isColorOnly: Boolean?,
+    val id: String?,
+    val altText: String? = null,
+    val contentType: String?,
+    val origin: String? = null,
+    val externalRef: String? = null,
+    val resources: String? = null,
+    val width: Int? = null,
+    val height: Int? = null,
+    val crop: Crop? = null
+)

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

@@ -0,0 +1,11 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Metadata section domain models
+
+data class Metadata(
+    val access: Access?,
+    val duplicationProtection: Boolean?,
+    val featuredListMemberships: List<FeaturedListMembership>?,
+    val lastEdit: LastEdit?,
+    val versionMetadata: VersionMetadata?
+)

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

@@ -0,0 +1,8 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Geometry helpers
+
+data class Point(
+    val x: Int?,
+    val y: Int?
+)

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

@@ -0,0 +1,23 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+import kotlin.time.Duration
+
+// Question and choice related domain models
+
+data class Question(
+    val type: String?,
+    val question: String?,
+    val time: Duration?,
+    val points: Boolean?,
+    val pointsMultiplier: Int?,
+    val choices: List<Choice>?,
+    val layout: String?,
+    val image: String?,
+    val imageMetadata: ImageMetadata?,
+    val resources: String?,
+    val video: Video?,
+    val questionFormat: Int?,
+    val languageInfo: LanguageInfo?,
+    val media: List<MediaItem>?,
+    val choiceRange: ChoiceRange?
+)

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

@@ -0,0 +1,3 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Moved: data classes have been split into separate files.

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

@@ -1,5 +1,35 @@
 package dev.adriankuta.kahootquiz.domain.models
 
+// Domain model representing a Quiz and its nested data
+
 data class Quiz(
-    val id: String
+    val id: QuizId,
+    val language: String?,
+    val creator: String?,
+    val creatorUsername: String?,
+    val compatibilityLevel: Int?,
+    val creatorPrimaryUsage: String?,
+    val folderId: String?,
+    val themeId: String?,
+    val visibility: Int?,
+    val audience: String?,
+    val title: String?,
+    val description: String?,
+    val quizType: String?,
+    val cover: String?,
+    val coverMetadata: CoverMetadata?,
+    val questions: List<Question>,
+    val contentTags: ContentTags?,
+    val metadata: Metadata?,
+    val resources: String?,
+    val slug: String?,
+    val languageInfo: LanguageInfo?,
+    val inventoryItemIds: List<String>,
+    val channels: List<Channel>,
+    val isValid: Boolean?,
+    val playAsGuest: Boolean?,
+    val hasRestrictedContent: Boolean?,
+    val type: String?,
+    val created: Long?,
+    val modified: Long?
 )

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

@@ -0,0 +1,5 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+data class QuizId(
+    val value: String,
+)

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

@@ -0,0 +1,9 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+// Version metadata
+
+data class VersionMetadata(
+    val version: Int?,
+    val created: Long?,
+    val creator: String?
+)

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

@@ -0,0 +1,9 @@
+package dev.adriankuta.kahootquiz.domain.models
+
+data class Video(
+    val id: String? = null,
+    val startTime: Int?,
+    val endTime: Int?,
+    val service: String?,
+    val fullUrl: String?
+)

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

@@ -1,7 +1,176 @@
 package dev.adriankuta.kahootquiz.model.data.mappers
 
-import dev.adriankuta.kahootquiz.core.network.models.QuizResponseDto
+import dev.adriankuta.kahootquiz.core.network.models.*
-import dev.adriankuta.kahootquiz.domain.models.Quiz
+import dev.adriankuta.kahootquiz.domain.models.*
 
 internal fun QuizResponseDto.toDomainModel(): Quiz =
-    Quiz(this.uuid ?: "")
+    Quiz(
+        id = QuizId(uuid),
+        language = language,
+        creator = creator,
+        creatorUsername = creatorUsername,
+        compatibilityLevel = compatibilityLevel,
+        creatorPrimaryUsage = creatorPrimaryUsage,
+        folderId = folderId,
+        themeId = themeId,
+        visibility = visibility,
+        audience = audience,
+        title = title,
+        description = description,
+        quizType = quizType,
+        cover = cover,
+        coverMetadata = coverMetadata?.toDomain(),
+        questions = questions?.map { it.toDomain() } ?: emptyList(),
+        contentTags = contentTags?.toDomain(),
+        metadata = metadata?.toDomain(),
+        resources = resources,
+        slug = slug,
+        languageInfo = languageInfo?.toDomain(),
+        inventoryItemIds = inventoryItemIds ?: emptyList(),
+        channels = channels?.map { it.toDomain() } ?: emptyList(),
+        isValid = isValid,
+        playAsGuest = playAsGuest,
+        hasRestrictedContent = hasRestrictedContent,
+        type = type,
+        created = created,
+        modified = modified
+    )
+
+private fun CoverMetadataDto.toDomain(): CoverMetadata = CoverMetadata(
+    id = id,
+    altText = altText,
+    contentType = contentType,
+    origin = origin,
+    externalRef = externalRef,
+    resources = resources,
+    width = width,
+    height = height,
+    extractedColors = extractedColors?.map { it.toDomain() },
+    blurhash = blurhash,
+    crop = crop?.toDomain()
+)
+
+private fun ExtractedColorDto.toDomain(): ExtractedColor = ExtractedColor(
+    swatch = swatch,
+    rgbHex = rgbHex
+)
+
+private fun CropDto.toDomain(): Crop = Crop(
+    origin = origin?.toDomain(),
+    target = target?.toDomain(),
+    circular = circular
+)
+
+private fun PointDto.toDomain(): Point = Point(x = x, y = y)
+
+private fun ContentTagsDto.toDomain(): ContentTags = ContentTags(
+    curriculumCodes = curriculumCodes,
+    generatedCurriculumCodes = generatedCurriculumCodes
+)
+
+private fun MetadataDto.toDomain(): Metadata = Metadata(
+    access = access?.toDomain(),
+    duplicationProtection = duplicationProtection,
+    featuredListMemberships = featuredListMemberships?.map { it.toDomain() },
+    lastEdit = lastEdit?.toDomain(),
+    versionMetadata = versionMetadata?.toDomain()
+)
+
+private fun AccessDto.toDomain(): Access = Access(
+    groupRead = groupRead,
+    folderGroupIds = folderGroupIds,
+    features = features
+)
+
+private fun FeaturedListMembershipDto.toDomain(): FeaturedListMembership = FeaturedListMembership(
+    list = list,
+    addedAt = addedAt
+)
+
+private fun LastEditDto.toDomain(): LastEdit = LastEdit(
+    editorUserId = editorUserId,
+    editorUsername = editorUsername,
+    editTimestamp = editTimestamp
+)
+
+private fun VersionMetadataDto.toDomain(): VersionMetadata = VersionMetadata(
+    version = version,
+    created = created,
+    creator = creator
+)
+
+private fun LanguageInfoDto.toDomain(): LanguageInfo = LanguageInfo(
+    language = language,
+    lastUpdatedOn = lastUpdatedOn,
+    readAloudSupported = readAloudSupported
+)
+
+private fun ChannelDto.toDomain(): Channel = Channel(id = id)
+
+private fun QuestionDto.toDomain(): Question = Question(
+    type = type,
+    question = question,
+    time = time,
+    points = points,
+    pointsMultiplier = pointsMultiplier,
+    choices = choices?.map { it.toDomain() },
+    layout = layout,
+    image = image,
+    imageMetadata = imageMetadata?.toDomain(),
+    resources = resources,
+    video = video?.toDomain(),
+    questionFormat = questionFormat,
+    languageInfo = languageInfo?.toDomain(),
+    media = media?.map { it.toDomain() },
+    choiceRange = choiceRange?.toDomain()
+)
+
+private fun ChoiceDto.toDomain(): Choice = Choice(
+    answer = answer,
+    correct = correct,
+    languageInfo = languageInfo?.toDomain()
+)
+
+private fun VideoDto.toDomain(): Video = Video(
+    id = id,
+    startTime = startTime,
+    endTime = endTime,
+    service = service,
+    fullUrl = fullUrl
+)
+
+private fun ImageMetadataDto.toDomain(): ImageMetadata = ImageMetadata(
+    id = id,
+    altText = altText,
+    contentType = contentType,
+    origin = origin,
+    externalRef = externalRef,
+    resources = resources,
+    width = width,
+    height = height,
+    effects = effects,
+    crop = crop?.toDomain()
+)
+
+private fun MediaItemDto.toDomain(): MediaItem = MediaItem(
+    type = type,
+    zIndex = zIndex,
+    isColorOnly = isColorOnly,
+    id = id,
+    altText = altText,
+    contentType = contentType,
+    origin = origin,
+    externalRef = externalRef,
+    resources = resources,
+    width = width,
+    height = height,
+    crop = crop?.toDomain()
+)
+
+private fun ChoiceRangeDto.toDomain(): ChoiceRange = ChoiceRange(
+    start = start,
+    end = end,
+    step = step,
+    correct = correct,
+    tolerance = tolerance
+)