/*
 * Copyright 2017-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

/**
 * Specifies what subset of Native targets to build
 *
 * ALL — all possible for compilation
 * HOST — host-specific ones, without cross compilation (e.g. do not build linuxX64 on macOS host)
 * SINGLE — only for current OS (to import into IDEA / quickly run tests)
 * DISABLED — disable all Native targets (useful with Kotlin compiler built from sources)
 *
 * For HOST mode, all targets are still listed in .module file, so HOST mode is useful for release process.
 */
enum NativeState { ALL, HOST, SINGLE, DISABLED }

def getNativeState(String description) {
    if (description == null) return NativeState.SINGLE
    switch(description.toLowerCase()) {
        case 'all':
        case 'true':
            return NativeState.ALL
        case 'host':
            return NativeState.HOST
        case 'disabled':
            return NativeState.DISABLED
        // 'single', 'false', etc
        default:
            return NativeState.SINGLE
    }
}

project.ext.ideaActive = System.getProperty('idea.active') == 'true'
project.ext.nativeState = getNativeState(property('native.deploy'))
project.ext.singleTargetMode = project.ext.ideaActive || (project.ext.nativeState == NativeState.SINGLE)

project.ext.nativeMainSets = []
project.ext.nativeTestSets = []

/**
 * Disables compilation but leaves the target in .module file
 */
def disableCompilation(targets) {
    configure(targets) {
        compilations.all {
            cinterops.all { project.tasks[interopProcessingTaskName].enabled = false }
            compileKotlinTask.enabled = false
        }
        binaries.all { linkTask.enabled = false }

        mavenPublication { publicationToDisable ->
            tasks.withType(AbstractPublishToMaven).all {
                onlyIf { publication != publicationToDisable }
            }
            tasks.withType(GenerateModuleMetadata).all {
                onlyIf { publication.get() != publicationToDisable }
            }
        }
    }
}

def getHostName() {
    def target = System.getProperty("os.name")
    if (target == 'Linux') return 'linux'
    if (target.startsWith('Windows')) return 'windows'
    if (target.startsWith('Mac')) return 'macos'
    return 'unknown'
}

static def doesNotDependOnOkio(project) {
    return !project.name.contains("json-okio") && !project.name.contains("json-tests")
}

kotlin {
    targets {
        def manager = project.ext.hostManager
        def linuxEnabled = manager.isEnabled(presets.linuxX64.konanTarget)
        def macosEnabled = manager.isEnabled(presets.macosX64.konanTarget)
        def winEnabled = manager.isEnabled(presets.mingwX64.konanTarget)

        def ideaPreset = presets.linuxX64
        if (macosEnabled) ideaPreset = presets.macosX64
        if (winEnabled) ideaPreset = presets.mingwX64
        project.ext.ideaPreset = ideaPreset
    }

    targets.metaClass.addTarget = { preset ->
        def target = delegate.fromPreset(preset, preset.name)
        project.ext.nativeMainSets.add(target.compilations['main'].kotlinSourceSets.first())
        project.ext.nativeTestSets.add(target.compilations['test'].kotlinSourceSets.first())
    }

    targets {
        if (project.ext.nativeState == NativeState.DISABLED) return
        if (project.ext.singleTargetMode) {
            fromPreset(project.ext.ideaPreset, 'native')
        } else {
            // Linux
            addTarget(presets.linuxX64)
            if (doesNotDependOnOkio(project)) {
                addTarget(presets.linuxArm32Hfp)
                addTarget(presets.linuxArm64)
            }

            // Mac & iOS
            addTarget(presets.macosX64)

            addTarget(presets.iosArm64)
            if (doesNotDependOnOkio(project)) {
                addTarget(presets.iosArm32)
            }
            addTarget(presets.iosX64)

            addTarget(presets.watchosX86)
            addTarget(presets.watchosX64)
            addTarget(presets.watchosArm32)
            addTarget(presets.watchosArm64)

            addTarget(presets.tvosArm64)
            addTarget(presets.tvosX64)

            // Apple Silicon
            addTarget(presets.iosSimulatorArm64)
            addTarget(presets.watchosSimulatorArm64)
            addTarget(presets.tvosSimulatorArm64)
            addTarget(presets.macosArm64)

            // Windows
            addTarget(presets.mingwX64)
            if (doesNotDependOnOkio(project)) {
                addTarget(presets.mingwX86)
            }
        }

        if (project.ext.nativeState == NativeState.HOST) {
            // linux targets that can cross-compile on all three hosts
            def linuxCrossCompileTargets = [linuxX64, linuxArm32Hfp, linuxArm64]
            if (getHostName() != "linux") {
                disableCompilation(linuxCrossCompileTargets)
            }
        }
    }


    sourceSets {
        nativeMain { dependsOn commonMain }
        // Empty source set is required in order to have native tests task
        nativeTest { dependsOn commonTest }

        if (!project.ext.singleTargetMode) {
            configure(project.ext.nativeMainSets) {
                dependsOn nativeMain
            }

            configure(project.ext.nativeTestSets) {
                dependsOn nativeTest
            }
        }
    }
}