/*
 * Copyright 2018 dorkbox, llc
 *
 * 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
 *
 *     http://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.
 */
package dorkbox.gradle

import org.gradle.api.DefaultTask
import org.gradle.api.tasks.wrapper.Wrapper
import org.gradle.util.GradleVersion
import org.json.JSONObject
import java.net.URL

open class
GradleUpdateTask : DefaultTask() {
    init {
        outputs.upToDateWhen { false }
        outputs.cacheIf { false }

        project.afterEvaluate {
            // always make sure this task when specified. ALWAYS skip for other tasks, Never skip for us.
            // This is a little bit of a PITA, because of how gradle configures, then runs tasks...

            if (project.gradle.startParameter.taskNames.contains(this.name)) {
                val releaseText = URL("https://services.gradle.org/versions/current").readText()
                val foundGradleVersion = JSONObject(releaseText)["version"] as String?

                if (foundGradleVersion.isNullOrEmpty()) {
                    println("\tUnable to detect New Gradle Version. Output json: $releaseText")
                }
                else {
                    val current = GradleVersion.current().version

                    if (current == foundGradleVersion) {
                        println("\tGradle is already latest version '$foundGradleVersion'")
                    } else {
                        println("\tDetected new Gradle Version: '$foundGradleVersion', updating from $current")

                        val wrapper = project.tasks.create("wrapperUpdate", Wrapper::class.java)
                        wrapper.apply {
                            group = "gradle"
                            outputs.upToDateWhen { false }
                            outputs.cacheIf { false }

                            gradleVersion = foundGradleVersion
                            distributionUrl = distributionUrl.replace("bin", "all")
                        }

                        finalizedBy(wrapper)
                    }
                }
            }
        }
    }

    override fun getDescription(): String {
        return "Automatically updates GRADLE to the latest version"
    }
}