refactor: migrate Android version update script to Kotlin DSL and remove Groovy version (#288)

* refactor: migrate Android version update script to Kotlin DSL and remove Groovy version

* fix: correct file extension for Android version update script in workflows

* docs: restore comment

.github/workflows/build.yml

@@ -189,7 +189,7 @@ jobs:
       - name: Update default Android platform versions in Flutter
         working-directory: test_app/android
         run: |
-          cat ../../script/updateAndroidVersions.gradle >> app/build.gradle
+          cat ../../script/updateAndroidVersions.gradle.kts >> app/build.gradle.kts
           ./gradlew --warning-mode all updateAndroidVersions
 
       - name: Setup Cue for JSON validation

.github/workflows/update_flutter_dependencies.yml

@@ -66,7 +66,7 @@ jobs:
       - name: Update default Android platform versions in Flutter
         working-directory: test_app/android
         run: |
-          cat ../../script/updateAndroidVersions.gradle >> app/build.gradle
+          cat ../../script/updateAndroidVersions.gradle.kts >> app/build.gradle.kts
           ./gradlew --warning-mode all updateAndroidVersions
 
       - name: Clean test application

script/updateAndroidVersions.gradle

@@ -1,35 +0,0 @@
-// Snippet to include at the end of android/app/build.gradle
-import groovy.json.JsonSlurper
-import groovy.json.JsonOutput
-
-tasks.register('updateAndroidVersions') {
-    doLast {
-        final jsonFile = new File('../../config/version.json')
-        final resultJsonMap = new JsonSlurper().parseText(jsonFile.text)
-
-        final rawPlatformVersions = [
-            flutter.targetSdkVersion,
-            flutter.compileSdkVersion
-        ]
-        
-        final platformVersions = rawPlatformVersions.unique()
-
-        final newJsonMap = [
-                android :[
-                    platforms: platformVersions.collect {
-                        [version: it]
-                    },
-                    gradle: [version: gradle.gradleVersion]
-            ]
-        ]
-
-        resultJsonMap.android.putAll(newJsonMap.android)
-
-        println resultJsonMap
-
-        final jsonStr = JsonOutput.toJson(resultJsonMap)
-        final prettyStr = JsonOutput.prettyPrint(jsonStr)
-
-        jsonFile.write("${prettyStr}\n")
-    }
-}

script/updateAndroidVersions.gradle.kts

@@ -0,0 +1,36 @@
+// Snippet to include at the end of android/app/build.gradle.kts
+
+tasks.register<DefaultTask>("updateAndroidVersions") {
+    doLast {
+        val jsonFile = File("../../config/version.json")     
+
+        // Parse existing JSON file
+        val resultJsonMap = groovy.json.JsonSlurper().parseText(jsonFile.readText()) as MutableMap<String, Any>
+
+        // Get unique platform versions
+        val platformVersions = listOf(
+            flutter.targetSdkVersion,
+            flutter.compileSdkVersion
+        ).distinct()
+
+        // Create new Android version data
+        val newJsonMap = mapOf(
+            "platforms" to platformVersions.map {
+                mapOf("version" to it)
+            },
+            "gradle" to mapOf("version" to gradle.gradleVersion)
+        )
+
+        // Merge new values into the existing JSON structure
+        (resultJsonMap["android"] as? MutableMap<String, Any>)?.putAll(newJsonMap)
+
+        // Format JSON with pretty printing
+        val jsonStr = groovy.json.JsonOutput.toJson(resultJsonMap)
+        val prettyStr = groovy.json.JsonOutput.prettyPrint(jsonStr)
+        
+        println(prettyStr)
+
+        // Write updated JSON back to the file
+        jsonFile.writeText("$prettyStr\n")
+    }
+}