pkl/buildSrc/src/main/kotlin/GradleVersionInfo.kt

/*
 * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import groovy.json.JsonSlurper
import java.net.URI
import org.gradle.util.GradleVersion

@Suppress("unused")
class GradleVersionInfo(json: Map<String, Any>) {
  val version: String by json

  val gradleVersion: GradleVersion by lazy { GradleVersion.version(version) }

  val isReleaseVersion: Boolean by lazy {
    // for some reason, `gradleVersion == gradleVersion.baseVersion` is a compile error
    gradleVersion.version == gradleVersion.baseVersion.version
  }

  val buildTime: String by json

  val current: Boolean by json

  val snapshot: Boolean by json

  val nightly: Boolean by json

  val releaseNightly: Boolean by json

  val activeRc: Boolean by json

  val rcFor: String by json

  val milestoneFor: String by json

  val broken: Boolean by json

  val downloadUrl: String by json

  val checksumUrl: String by json

  val wrapperChecksumUrl: String by json

  companion object {
    private fun fetchAll(): List<GradleVersionInfo> =
      fetchMultiple("https://services.gradle.org/versions/all")

    fun fetchReleases(): List<GradleVersionInfo> = fetchAll().filter { it.isReleaseVersion }

    fun fetchCurrent(): GradleVersionInfo =
      fetchSingle("https://services.gradle.org/versions/current")

    fun fetchRc(): GradleVersionInfo? =
      fetchSingleOrNull("https://services.gradle.org/versions/release-candidate")

    fun fetchNightly(): GradleVersionInfo =
      fetchSingle("https://services.gradle.org/versions/nightly")

    private fun fetchSingle(url: String): GradleVersionInfo {
      @Suppress("UNCHECKED_CAST")
      return GradleVersionInfo(JsonSlurper().parse(URI(url).toURL()) as Map<String, Any>)
    }

    private fun fetchSingleOrNull(url: String): GradleVersionInfo? {
      @Suppress("UNCHECKED_CAST")
      val json = JsonSlurper().parse(URI(url).toURL()) as Map<String, Any>
      return if (json.isEmpty()) null else GradleVersionInfo(json)
    }

    private fun fetchMultiple(url: String): List<GradleVersionInfo> {
      @Suppress("UNCHECKED_CAST")
      return (JsonSlurper().parse(URI(url).toURL()) as List<Map<String, Any>>).map {
        GradleVersionInfo(it)
      }
    }
  }
}