WorldGuard/buildSrc/src/main/kotlin/LibsConfig.kt

import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
import org.gradle.api.Plugin
import org.gradle.api.Project
import org.gradle.api.artifacts.ExternalModuleDependency
import org.gradle.api.artifacts.ModuleDependency
import org.gradle.api.attributes.Bundling
import org.gradle.api.attributes.Category
import org.gradle.api.attributes.DocsType
import org.gradle.api.attributes.LibraryElements
import org.gradle.api.attributes.Usage
import org.gradle.api.attributes.java.TargetJvmVersion
import org.gradle.api.component.AdhocComponentWithVariants
import org.gradle.api.component.SoftwareComponentFactory
import org.gradle.api.publish.PublishingExtension
import org.gradle.api.publish.maven.MavenPublication
import org.gradle.api.tasks.bundling.Jar
import org.gradle.kotlin.dsl.apply
import org.gradle.kotlin.dsl.configure
import org.gradle.kotlin.dsl.get
import org.gradle.kotlin.dsl.invoke
import org.gradle.kotlin.dsl.named
import org.gradle.kotlin.dsl.register
import javax.inject.Inject

fun Project.applyLibrariesConfiguration() {
    applyCommonConfiguration()
    apply(plugin = "java-base")
    apply(plugin = "maven-publish")
    apply(plugin = "com.github.johnrengelman.shadow")
    apply(plugin = "com.jfrog.artifactory")

    configurations {
        create("shade")
    }

    group = "${rootProject.group}.worldguard-libs"

    val relocations = mapOf(
        "org.enginehub.squirrelid" to "com.sk89q.worldguard.util.profile"
    )

    tasks.register<ShadowJar>("jar") {
        configurations = listOf(project.configurations["shade"])
        archiveClassifier.set("")

        dependencies {
            exclude(dependency("com.google.code.findbugs:jsr305"))
        }

        relocations.forEach { (from, to) ->
            relocate(from, to)
        }
    }
    val altConfigFiles = { artifactType: String ->
        val deps = configurations["shade"].incoming.dependencies
            .filterIsInstance<ModuleDependency>()
            .map { it.copy() }
            .map { dependency ->
                dependency.artifact {
                    name = dependency.name
                    type = artifactType
                    extension = "jar"
                    classifier = artifactType
                }
                dependency
            }

        files(configurations.detachedConfiguration(*deps.toTypedArray())
            .resolvedConfiguration.lenientConfiguration.artifacts
            .filter { it.classifier == artifactType }
            .map { zipTree(it.file) })
    }
    tasks.register<Jar>("sourcesJar") {
        from({
            altConfigFiles("sources")
        })
        relocations.forEach { (from, to) ->
            val filePattern = Regex("(.*)${from.replace('.', '/')}((?:/|$).*)")
            val textPattern = Regex.fromLiteral(from)
            eachFile {
                filter {
                    it.replaceFirst(textPattern, to)
                }
                path = path.replaceFirst(filePattern, "$1${to.replace('.', '/')}$2")
            }
        }
        archiveClassifier.set("sources")
    }

    tasks.named("assemble").configure {
        dependsOn("jar", "sourcesJar")
    }

    project.apply<LibsConfigPluginHack>()

    val libsComponent = project.components["libs"] as AdhocComponentWithVariants

    val apiElements = project.configurations.register("apiElements") {
        isVisible = false
        description = "API elements for libs"
        isCanBeResolved = false
        isCanBeConsumed = true
        attributes {
            attribute(Usage.USAGE_ATTRIBUTE, project.objects.named(Usage.JAVA_API))
            attribute(Category.CATEGORY_ATTRIBUTE, project.objects.named(Category.LIBRARY))
            attribute(Bundling.BUNDLING_ATTRIBUTE, project.objects.named(Bundling.SHADOWED))
            attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, project.objects.named(LibraryElements.JAR))
            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 8)
        }
        outgoing.artifact(tasks.named("jar"))
    }

    val runtimeElements = project.configurations.register("runtimeElements") {
        isVisible = false
        description = "Runtime elements for libs"
        isCanBeResolved = false
        isCanBeConsumed = true
        attributes {
            attribute(Usage.USAGE_ATTRIBUTE, project.objects.named(Usage.JAVA_RUNTIME))
            attribute(Category.CATEGORY_ATTRIBUTE, project.objects.named(Category.LIBRARY))
            attribute(Bundling.BUNDLING_ATTRIBUTE, project.objects.named(Bundling.SHADOWED))
            attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, project.objects.named(LibraryElements.JAR))
            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 8)
        }
        outgoing.artifact(tasks.named("jar"))
    }

    val sourcesElements = project.configurations.register("sourcesElements") {
        isVisible = false
        description = "Source elements for libs"
        isCanBeResolved = false
        isCanBeConsumed = true
        attributes {
            attribute(Usage.USAGE_ATTRIBUTE, project.objects.named(Usage.JAVA_RUNTIME))
            attribute(Category.CATEGORY_ATTRIBUTE, project.objects.named(Category.DOCUMENTATION))
            attribute(Bundling.BUNDLING_ATTRIBUTE, project.objects.named(Bundling.SHADOWED))
            attribute(DocsType.DOCS_TYPE_ATTRIBUTE, project.objects.named(DocsType.SOURCES))
        }
        outgoing.artifact(tasks.named("sourcesJar"))
    }

    libsComponent.addVariantsFromConfiguration(apiElements.get()) {
        mapToMavenScope("compile")
    }

    libsComponent.addVariantsFromConfiguration(runtimeElements.get()) {
        mapToMavenScope("runtime")
    }

    libsComponent.addVariantsFromConfiguration(sourcesElements.get()) {
        mapToMavenScope("runtime")
    }

    configure<PublishingExtension> {
        publications {
            register<MavenPublication>("maven") {
                from(libsComponent)
            }
        }
    }

    applyCommonArtifactoryConfig()
}

// A horrible hack because `softwareComponentFactory` has to be gotten via plugin
// gradle why
internal open class LibsConfigPluginHack @Inject constructor(
    private val softwareComponentFactory: SoftwareComponentFactory
) : Plugin<Project> {
    override fun apply(project: Project) {
        val libsComponents = softwareComponentFactory.adhoc("libs")
        project.components.add(libsComponents)
    }
}

fun Project.constrainDependenciesToLibsCore() {
    evaluationDependsOn(":worldguard-libs:core")
    val coreDeps = project(":worldguard-libs:core").configurations["shade"].dependencies
        .filterIsInstance<ExternalModuleDependency>()
    dependencies.constraints {
        for (coreDep in coreDeps) {
            add("shade", "${coreDep.group}:${coreDep.name}:${coreDep.version}") {
                because("libs should align with libs:core")
            }
        }
    }
}