buildscript {
	repositories {
		jcenter()
		maven {
			name "Modmuss50 Repository"
			url 'https://maven.modmuss50.me'
		}
	}
	dependencies {
		classpath "net.fabricmc:weave:0.2.0.+"
		classpath "net.fabricmc:stitch:0.1.0.23+"
		classpath "commons-io:commons-io:1.4"
		classpath "com.google.guava:guava:19.0"
		classpath 'de.undercouch:gradle-download-task:3.4.3'
		classpath 'net.fabricmc:tiny-remapper:+'
	}
}

plugins {
	id 'de.undercouch.download' version '3.4.3'
	id 'maven'
	id 'maven-publish'
}

def minecraft_version = "18w50a"

def ENV = System.getenv()
// Fetch build number from Jenkins
def build_number = ENV.BUILD_NUMBER ?: "local"

def yarnVersion = "${minecraft_version}.$build_number"


repositories {
	mavenCentral()
	maven {
		name "Modmuss50 Repository"
		url 'https://maven.modmuss50.me'
	}
}

configurations {
	enigmaRuntime {
		resolutionStrategy {
			cacheDynamicVersionsFor 0, "seconds"
			cacheChangingModulesFor 0, "seconds"
		}
	}
}

dependencies {
	enigmaRuntime "net.fabricmc:stitch:0.1.0.23+"
	enigmaRuntime "cuchaz:enigma:0.12.2.+:all"
}

def mappingsDir = file("mappings")
def cacheFilesMinecraft = file(".gradle/minecraft")
def tempDir = file(".gradle/temp")
def mergedFile = file("${minecraft_version}-merged.jar")
def mappedFile = file("${minecraft_version}-mapped.jar")
def versionFile = new File(cacheFilesMinecraft, "${minecraft_version}.json")
def clientJar = new File(cacheFilesMinecraft, "${minecraft_version}-client.jar")
def serverJar = new File(cacheFilesMinecraft, "${minecraft_version}-server.jar")
def libraries = new File(cacheFilesMinecraft, "${minecraft_version}-libraries")
def libs = new File("build/libs/")

import groovy.json.JsonSlurper
import org.apache.commons.io.FileUtils
import com.google.common.hash.Hashing
import com.google.common.io.Files
import net.fabricmc.stitch.commands.CommandMergeTiny
import net.fabricmc.stitch.merge.JarMerger
import net.fabricmc.tinyremapper.OutputConsumerPath
import net.fabricmc.tinyremapper.TinyRemapper
import net.fabricmc.tinyremapper.TinyUtils
import net.fabricmc.weave.CommandTinyify
import net.fabricmc.weave.CommandFindMappingErrors
import groovy.io.FileType
import java.util.zip.GZIPOutputStream

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 downloadVersionsManifest {
	//inputs.property "mc_ver", minecraft_version
	inputs.property "currenttime", new Date()
	def manifestFile = new File(cacheFilesMinecraft, "version_manifest.json")
	outputs.file(manifestFile)
	doLast {
		logger.lifecycle(":downloading minecraft versions manifest")
		FileUtils.copyURLToFile(new URL("https://launchermeta.mojang.com/mc/game/version_manifest.json"), manifestFile)
	}
}

def getManifestVersion(File manifestFile, String minecraft_version) {
	def manifest = manifestFile.exists() ? new JsonSlurper().parseText(FileUtils.readFileToString(manifestFile)) : null
	return manifest != null ? manifest.versions.stream().filter({it.id.equals(minecraft_version)}).findFirst() : java.util.Optional.empty()
}

task downloadWantedVersionManifest(dependsOn: downloadVersionsManifest) {
	def manifestFile = downloadVersionsManifest.outputs.files.singleFile
	def manifestVersion = getManifestVersion(manifestFile, minecraft_version)

	//have to grab the release time as there's a current timestamp on each element?!
	inputs.property "releaseTime", manifestVersion.isPresent() ? manifestVersion.get().releaseTime : -1

	outputs.file versionFile

	doLast {
		manifestVersion = getManifestVersion(manifestFile, minecraft_version) //nb need to re-read here in case it didn't exist before
		if (manifestVersion.isPresent() || versionFile.exists()) {

			if (manifestVersion.isPresent()) {
				FileUtils.copyURLToFile(new URL(manifestVersion.get().url), versionFile)
			}
		} else {
			throw new RuntimeException("No version data for Minecraft version ${minecraft_version}")
		}
	}

}

task downloadMcJars(dependsOn: downloadWantedVersionManifest) {

	inputs.files versionFile

	outputs.files(clientJar, serverJar)

	outputs.upToDateWhen {
		def version = new JsonSlurper().parseText(FileUtils.readFileToString(versionFile))
		return clientJar.exists() && serverJar.exists() && validateChecksum(clientJar, version.downloads.client.sha1) && validateChecksum(serverJar, version.downloads.server.sha1)
	}

	doLast {
		if (!versionFile.exists()) {
			throw new RuntimeException("Can't download the jars without the ${versionFile.name} file!")
		}

		//reload in case it changed
		def version = new JsonSlurper().parseText(FileUtils.readFileToString(versionFile))

		logger.lifecycle(":downloading minecraft jars")

		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)
		}
	}
}

task mergeJars(dependsOn: downloadMcJars) {
	inputs.files downloadMcJars.outputs.files.files
	outputs.file(mergedFile)

	doLast {
		logger.lifecycle(":merging jars")
		def client = new FileInputStream(inputs.files.files.find {it.name.endsWith("-client.jar")})
		def server = new FileInputStream(inputs.files.files.find {it.name.endsWith("-server.jar")})
		def merged = new FileOutputStream(mergedFile)

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

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

}

task setupYarn(dependsOn: mergeJars) {

}

task yarn(dependsOn: setupYarn) {
	doLast {
		ant.java(
			classname: 'cuchaz.enigma.Main',
			classpath: configurations.enigmaRuntime.asPath,
			fork: true,
			spawn: true
		) {
			arg(value: mergedFile.getAbsolutePath())
			arg(value: mappingsDir.getAbsolutePath())
		}
	}
}

task buildEnigma(type: Zip) {
	from mappingsDir
	include "**/*"
	archiveName "yarn-enigma-${yarnVersion}.zip"
	destinationDir(file("build/libs"))
}

task checkMappings {
	inputs.dir mappingsDir
	doLast {
		logger.lifecycle(":checking mappings")

		String[] args = [
			mergedFile.getAbsolutePath(),
			mappingsDir.getAbsolutePath()
		]

		new CommandFindMappingErrors().run(args)
	}
}

task downloadIntermediary(type: Download){
    src "https://github.com/FabricMC/intermediary/raw/master/mappings/${minecraft_version}.tiny"
    dest new File(cacheFilesMinecraft, "${minecraft_version}-intermediary.tiny")
}

task buildYarnTiny(dependsOn: "mergeJars",type: FileOutput) {
	inputs.dir mappingsDir
	if (!libs.exists()) {
		libs.mkdirs()
	}

	def yarnTiny = new File(tempDir, "yarn-mappings.tiny")
	fileOutput = yarnTiny
	
	outputs.upToDateWhen {return false}

	doLast {
		logger.lifecycle(":generating tiny mappings")

		String[] args = [
			mergedFile.getAbsolutePath(),
			mappingsDir.getAbsolutePath(),
			yarnTiny.getAbsolutePath(),
			"official",
			"named"
		]

		new CommandTinyify().run(args)
	}
}

task mergeTiny(dependsOn: ["buildYarnTiny", "downloadIntermediary"], type: FileOutput) {
	def yarnTinyInput = buildYarnTiny.fileOutput
	def intermediaryTinyInput = downloadIntermediary.dest

	def outputFile = new File(tempDir, "mappings.tiny")
	outputs.file(outputFile)
	fileOutput = outputFile

	outputs.upToDateWhen {return false}

	doLast {
		logger.lifecycle(":merging yarn and intermediary")
		String[] args = [
			yarnTinyInput.getAbsolutePath(),
			intermediaryTinyInput.getAbsolutePath(),
			outputFile.getAbsolutePath(),
			"intermediary",
			"official"
		]

		new CommandMergeTiny().run(args)
	}
}

task tinyJar(type: Jar, dependsOn: "mergeTiny") {
	outputs.upToDateWhen {return false}
	archiveName = "yarn-${yarnVersion}.jar"
	destinationDir(file("build/libs"))
	classifier = ""
	from (mergeTiny.fileOutput) {
		rename { "mappings/mappings.tiny" }
	}
}

task compressTiny(dependsOn: ["tinyJar", "mergeTiny"], type: FileOutput){
	def outputFile = new File(libs, "yarn-tiny-${yarnVersion}.gz")
	outputs.file(outputFile)
	fileOutput = outputFile

	def inputFile = mergeTiny.fileOutput

	outputs.upToDateWhen {return false}

	doLast {
		logger.lifecycle(":compressing tiny mappings")

		def buffer = new byte[1024]
		def fileOutputStream = new FileOutputStream(outputFile)
		def outputStream = new GZIPOutputStream(fileOutputStream)
		def fileInputStream = new FileInputStream(inputFile)

		def length
		while ((length = fileInputStream.read(buffer)) > 0) {
			outputStream.write(buffer, 0, length)
		}

		fileInputStream.close()
		outputStream.finish()
		outputStream.close()
		inputFile.delete()
	}
}

clean.doFirst {
	delete tempDir, cacheFilesMinecraft
}

tasks.build.dependsOn "compressTiny"
tasks.build.dependsOn "buildEnigma"
tasks.build.dependsOn "tinyJar"

task downloadMcLibs(dependsOn: downloadWantedVersionManifest) {
	inputs.files versionFile

	outputs.file(libraries)

	outputs.upToDateWhen {
		return false
	}

	doLast {
		if (!versionFile.exists()) {
			throw new RuntimeException("Can't download the jars without the ${versionFile.name} file!")
		}

		def version = new JsonSlurper().parseText(FileUtils.readFileToString(versionFile))

		logger.lifecycle(":downloading minecraft libraries")

		if (!libraries.exists()) {
			libraries.mkdirs()
		}

		version.libraries.each {
			def downloadUrl = it.downloads.artifact.url

			download {
				src downloadUrl
				dest new File(libraries, downloadUrl.substring(downloadUrl.lastIndexOf("/") + 1))
				overwrite false
			}
		}
	}
}

task mapJar(dependsOn: [downloadMcLibs, build]) {
	inputs.files downloadMcLibs.outputs.files.files
	outputs.file(mappedFile)

	//Force the task to always run
	outputs.upToDateWhen {
		return false
	}

	doLast {
		logger.lifecycle(":mapping minecraft")

		if (mappedFile.exists()) {
			mappedFile.delete()
		}

		def tinyInput = new File("build/libs/yarn-tiny-${yarnVersion}.gz").toPath()

		def remapper = TinyRemapper.newRemapper()
			.withMappings(TinyUtils.createTinyMappingProvider(tinyInput, "official", "named"))
			.build()
      
		try {

			def outputConsumer = new OutputConsumerPath(mappedFile.toPath())

			outputConsumer.addNonClassFiles(mergedFile.toPath())
			remapper.read(mergedFile.toPath())

			libraries.eachFileRecurse(FileType.FILES) {file ->
				remapper.read(file.toPath())
			}

			remapper.apply(mergedFile.toPath(), outputConsumer)
			outputConsumer.finish()
			remapper.finish()
		} catch (Exception e) {
			remapper.finish();
			throw new RuntimeException("Failed to remap jar", e);
		}
	}
}

publishing {
	publications {
		maven(MavenPublication) {
			groupId 'net.fabricmc'
			artifactId "yarn"
			version yarnVersion

			artifact (compressTiny.fileOutput) {
				classifier "tiny"
				builtBy compressTiny
			}
			artifact (buildEnigma) {
				classifier "enigma"
			}
			artifact (tinyJar)
		}
	}
	repositories {
		maven {
			url "http://mavenupload.modmuss50.me/"
			if (project.hasProperty('mavenPass')) {
				credentials {
					username 'buildslave'
					password project.getProperty('mavenPass')
				}
			}
		}
	}
}


class FileOutput extends DefaultTask {
	@OutputFile File fileOutput
}