plugins {
    id 'java'
    id 'com.gradleup.shadow' version '9.0.0-beta12'
}

java {
    sourceCompatibility = JavaVersion.VERSION_21
    targetCompatibility = JavaVersion.VERSION_21
}

sourceSets {
    main {
        java {
            srcDirs = ['src']
        }
    }
}

jar {
    manifest {
        attributes 'Main-Class': 'dev.rsems.treesize.j.Main'
    }
}

shadowJar {
    archiveBaseName = 'treesize'
    archiveClassifier = ''
    archiveVersion = ''
}

// --- jpackage-based native image ---

def jpackageOutputDir = layout.buildDirectory.dir('jpackage')
def nativeOutputDir = layout.buildDirectory.dir('native')

tasks.register('jpackageImage', Exec) {
    dependsOn shadowJar
    group = 'distribution'
    description = 'Creates a self-contained native application image using jpackage'

    def inputDir = shadowJar.destinationDirectory
    def outputDir = jpackageOutputDir.get().asFile

    doFirst {
        delete outputDir
        outputDir.mkdirs()
    }

    commandLine 'jpackage',
        '--type', 'app-image',
        '--name', 'treesize',
        '--input', inputDir.get().asFile.absolutePath,
        '--main-jar', 'treesize.jar',
        '--main-class', 'dev.rsems.treesize.j.Main',
        '--dest', outputDir.absolutePath,
        '--java-options', '-Xmx512m'
}

tasks.register('nativeBinary', Copy) {
    dependsOn jpackageImage
    group = 'distribution'
    description = 'Copies the self-contained native binary to build/native/treesize'

    def outputDir = nativeOutputDir.get().asFile

    doFirst {
        outputDir.mkdirs()
    }

    from(jpackageOutputDir.get().asFile.absolutePath + '/treesize') {
        include '**/*'
    }
    into outputDir.absolutePath + '/treesize'
}

tasks.register('dist') {
    dependsOn shadowJar, nativeBinary
    group = 'distribution'
    description = 'Builds both treesize.jar and the native treesize binary'

    doLast {
        println ''
        println '=== Build Complete ==='
        println "Fat JAR:        ${shadowJar.archiveFile.get().asFile.absolutePath}"
        println "Native image:   ${nativeOutputDir.get().asFile.absolutePath}/treesize/"
        println "Native binary:  ${nativeOutputDir.get().asFile.absolutePath}/treesize/bin/treesize"
        println ''
        println 'Usage:'
        println '  java -jar build/libs/treesize.jar          # Run via JAR'
        println '  build/native/treesize/bin/treesize          # Run native binary'
    }
}