import org.gradle.internal.jvm.Jvm

plugins {
    kotlin("jvm") version "2.3.0"
    kotlin("plugin.serialization") version "2.0.0"
}

group = "su.sonoma"
version = "0.1"

repositories {
    mavenCentral()
}

dependencies {
    testImplementation(kotlin("test"))
    implementation("io.ktor:ktor-network:3.1.3")
    implementation("org.jetbrains.kotlin:kotlin-stdlib:1.9.22")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2")
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.0")
}

kotlin {
    jvmToolchain(25)
}

tasks.jar {
    dependsOn("buildTunLib")
    dependsOn(configurations.runtimeClasspath)

    manifest {
        attributes["Main-Class"] = "su.sonoma.MainKt"
    }

    duplicatesStrategy = DuplicatesStrategy.EXCLUDE

    from(sourceSets.main.get().output)

    from({
        configurations.runtimeClasspath.get().filter { it.name.endsWith("jar") }.map { zipTree(it) }
    })

    archiveBaseName.set(rootProject.name)
    archiveVersion.set(version.toString())
}

tasks.test {
    useJUnitPlatform()
}

tasks.register("generateTestServerConfig") {

    val outputFile = layout.buildDirectory.file("tmp/server.json")

    outputs.file(outputFile)

    doLast {

        val file = outputFile.get().asFile

        file.parentFile.mkdirs()

        file.writeText("""
            {
                "type": "server",
                "address": "10.1.0.1",
                "port": 9093
            }
        """.trimIndent())
    }
}

tasks.register("generateTestClientConfig") {

    val outputFile = layout.buildDirectory.file("tmp/client.json")

    outputs.file(outputFile)

    doLast {

        val file = outputFile.get().asFile

        file.parentFile.mkdirs()

        file.writeText("""
            {
                "type": "client",
                "host": "192.168.88.247",
                "address": "10.1.0.2",
                "port": 9093
            }
        """.trimIndent())
    }
}

tasks.register<JavaExec>("runServer") {
    group = "app"
    description = "Run server"
    classpath = sourceSets["main"].runtimeClasspath
    mainClass.set("su.sonoma.MainKt")
    args = listOf("${projectDir}/build/tmp/server.json")
    jvmArgs = listOf(
        "--add-opens=java.base/java.io=ALL-UNNAMED"
    )
    dependsOn("buildTunLib")
    dependsOn("generateTestServerConfig")

    systemProperty(
        "java.library.path",
        "${projectDir}/build/native/"
    )
}

tasks.register<JavaExec>("runClient") {
    group = "app"
    description = "Run client"
    classpath = sourceSets["main"].runtimeClasspath
    mainClass.set("su.sonoma.MainKt")
    args = listOf("${projectDir}/build/tmp/client.json")
    jvmArgs = listOf(
        "--add-opens=java.base/java.io=ALL-UNNAMED"
    )
    dependsOn("buildTunLib")
    dependsOn("generateTestClientConfig")

    systemProperty(
        "java.library.path",
        "${projectDir}/build/native/"
    )
}

val javaHome = Jvm.current().javaHome.absolutePath

tasks.register<Exec>("buildTunLib") {
    group = "build"

    val outputDir = layout.buildDirectory.dir("native").get().asFile

    doFirst {
        outputDir.mkdirs()
    }

    commandLine(
        "gcc",
        "-shared",
        "-fPIC",
        "-z", "noexecstack",

        "-o",
        "${outputDir.absolutePath}/libtun.so",

        "src/main/c/tun.c",

        "-I$javaHome/include",
        "-I$javaHome/include/linux"
    )
}

tasks.register("generateRunScript") {

    val output = layout.buildDirectory.file("tmp/${rootProject.name}")
    val name = rootProject.name.plus('-').plus(version)
    val jarName = name.plus(".jar")

    outputs.file(output)

    doLast {
        val script = output.get().asFile

        script.parentFile.mkdirs()

        script.writeText("""
                    #!/bin/bash
            
                    java \
                      -Djava.library.path="." \
                      -jar "$jarName" "$@"
                    """.trimIndent())

        script.setExecutable(true)
    }
}

tasks.register<Tar>("packageApp") {
    group = "build"

    destinationDirectory.set(layout.buildDirectory.dir("dist"))

    compression = Compression.GZIP

    dependsOn("jar")
    dependsOn("generateRunScript")

    val name = rootProject.name.plus('-').plus(version)
    val jarName = name.plus(".jar")

    archiveFileName.set("$name.tar.gz")


        from("build/libs/$jarName")

        from("build/native/libtun.so")

        from("build/tmp/${rootProject.name}")

}