buildscript {
    repositories {
        jcenter()
        maven {
        	name = "Fabric"
        	url = "http://maven.fabricmc.net/"
        }
    }
    dependencies {
        classpath "net.fabricmc:blending-jar:0.1.1.6"
        classpath "commons-io:commons-io:1.4"
        classpath "com.google.guava:guava:19.0"
    }
}

def minecraft_version = "16w33a"

import groovy.json.JsonSlurper
import org.apache.commons.io.FileUtils
import com.google.common.hash.HashCode
import com.google.common.hash.Hashing
import com.google.common.io.Files
import net.fabricmc.blendingjar.JarMerger
import groovy.util.XmlSlurper

boolean validateChecksum(File file, String checksum) {
	if (file != null) {
		def hash = Files.hash(file, Hashing.sha1())
		def builder = new StringBuilder()
		hash.asBytes().each {
			builder.append(Integer.toString((it & 0xFF) + 0x100, 16).substring(1))
		}
		return builder.toString().equals(checksum)
	}
	return false
}

task download << {
	def cacheFiles = new File(".gradle/minecraft")
	if (!cacheFiles.exists()) cacheFiles.mkdirs()

	def manifestFile = new File(cacheFiles, "version_manifest.json")

	logger.lifecycle(":downloading minecraft json")
	FileUtils.copyURLToFile(new URL("https://launchermeta.mojang.com/mc/game/version_manifest.json"), manifestFile)

	def manifest = new JsonSlurper().parseText(FileUtils.readFileToString(manifestFile))
	def manifestVersion = manifest.versions.stream().filter({ it.id.equals(minecraft_version) }).findFirst()
	if (manifestVersion.isPresent()) {

		def versionFile = new File(cacheFiles, "${minecraft_version}.json")
		FileUtils.copyURLToFile(new URL(manifestVersion.get().url), versionFile)
		def version = new JsonSlurper().parseText(FileUtils.readFileToString(versionFile))

		def clientJar = new File(cacheFiles, "${minecraft_version}-client.jar")
		def serverJar = new File(cacheFiles, "${minecraft_version}-server.jar")

		if (!clientJar.exists() || !validateChecksum(clientJar, version.downloads.client.sha1)) {
			logger.lifecycle(":downloading minecraft client")
			FileUtils.copyURLToFile(new URL(version.downloads.client.url), clientJar)
		}

		if (!serverJar.exists() || !validateChecksum(serverJar, version.downloads.server.sha1)) {
			logger.lifecycle(":downloading minecraft server")
			FileUtils.copyURLToFile(new URL(version.downloads.server.url), serverJar)
		}

	} else {
		throw new RuntimeException("No version data for Minecraft version ${minecraft_version}")
	}
}

task mergeJars << {
	def mergedFile = new File("${minecraft_version}-merged.jar")

	if (!mergedFile.exists()) {
		def cacheFiles = new File(".gradle/minecraft")

		def client = new FileInputStream(new File(cacheFiles, "${minecraft_version}-client.jar"))
		def server = new FileInputStream(new File(cacheFiles, "${minecraft_version}-server.jar"))
		def merged = new FileOutputStream(mergedFile)

		def jarMerger = new JarMerger(client, server, merged)
		jarMerger.merge()
		jarMerger.close()

		client.close()
		server.close()
		merged.close()
	}

}
tasks.mergeJars.dependsOn "download"

task setupPomf << {
	
}
tasks.setupPomf.dependsOn "mergeJars"

task pomf << {
	def cacheFiles = new File(".gradle/enigma")
	if (!cacheFiles.exists()) cacheFiles.mkdirs()

	def mavenMetadata = new File(cacheFiles, "maven-metadata.xml")

	logger.lifecycle(":downloading enigma metadata")
	FileUtils.copyURLToFile(new URL("http://maven.fabricmc.net/net/fabricmc/enigma/maven-metadata.xml"), mavenMetadata)
	
	def metadata = new XmlSlurper().parseText(FileUtils.readFileToString(mavenMetadata))
	def enigmaVersion = metadata.versioning.release

	def enigma = new File(cacheFiles, "${enigmaVersion}.jar")

	logger.lifecycle(":downloading enigma")
	FileUtils.copyURLToFile(new URL("http://maven.fabricmc.net/net/fabricmc/enigma/${enigmaVersion}/enigma-${enigmaVersion}-all.jar"), enigma)

	logger.lifecycle(":launching enigma")
	ant.java(jar: enigma.getAbsolutePath(), fork: true, spawn: true) {
		arg(value: new File("${minecraft_version}-merged.jar").getAbsolutePath())
		arg(value: new File("mappings/").getAbsolutePath())
	}
}
tasks.pomf.dependsOn "setupPomf"