feat: introduce core data models and interfaces for playback and downloads

core/image/build.gradle.kts

@@ -0,0 +1,16 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    alias(libs.plugins.kotlin.jvm)
+}
+
+kotlin {
+    compilerOptions {
+        jvmTarget.set(JvmTarget.JVM_11)
+    }
+    jvmToolchain(11)
+}
+
+dependencies {
+    implementation(project(":core:model"))
+}

core/image/src/main/java/hu/bbara/purefin/core/image/ArtworkKind.kt

@@ -0,0 +1,8 @@
+package hu.bbara.purefin.core.image
+
+enum class ArtworkKind(
+    internal val pathSegment: String,
+) {
+    PRIMARY("Primary"),
+    BACKDROP("Backdrop"),
+}

core/image/src/main/java/hu/bbara/purefin/core/image/ImageUrlBuilder.kt

@@ -0,0 +1,40 @@
+package hu.bbara.purefin.core.image
+
+import java.util.UUID
+
+object ImageUrlBuilder {
+    fun toImageUrl(url: String, itemId: UUID, artworkKind: ArtworkKind): String {
+        if (url.isEmpty()) {
+            return ""
+        }
+        return StringBuilder()
+            .append(url)
+            .append("/Items/")
+            .append(itemId)
+            .append("/Images/")
+            .append(artworkKind.pathSegment)
+            .toString()
+    }
+
+    fun toPrefixImageUrl(url: String, itemId: UUID): String {
+        if (url.isEmpty()) {
+            return ""
+        }
+        return StringBuilder()
+            .append(url)
+            .append("/Items/")
+            .append(itemId)
+            .append("/Images/")
+            .toString()
+    }
+
+    fun finishImageUrl(prefixImageUrl: String?, artworkKind: ArtworkKind): String {
+        if (prefixImageUrl.isNullOrEmpty()) {
+            return ""
+        }
+        return StringBuilder()
+            .append(prefixImageUrl)
+            .append(artworkKind.pathSegment)
+            .toString()
+    }
+}