/*
 * Copyright 2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.kotlin.dsl.integration

import okhttp3.HttpUrl
import okhttp3.mockwebserver.MockResponse
import okhttp3.mockwebserver.MockWebServer
import org.gradle.integtests.fixtures.RepoScriptBlockUtil
import org.gradle.integtests.fixtures.versions.KotlinGradlePluginVersions
import org.gradle.kotlin.dsl.*
import org.gradle.kotlin.dsl.fixtures.AbstractKotlinIntegrationTest
import org.gradle.kotlin.dsl.fixtures.DeepThought
import org.gradle.kotlin.dsl.fixtures.LightThought
import org.gradle.kotlin.dsl.fixtures.ZeroThought
import org.gradle.kotlin.dsl.fixtures.clickableUrlFor
import org.gradle.kotlin.dsl.fixtures.containsMultiLineString
import org.gradle.kotlin.dsl.support.normaliseLineSeparators
import org.gradle.test.fixtures.dsl.GradleDsl
import org.gradle.test.fixtures.file.LeaksFileHandles
import org.gradle.test.fixtures.server.http.HttpServer
import org.gradle.test.precondition.Requires
import org.gradle.test.preconditions.IntegTestPreconditions
import org.gradle.test.preconditions.UnitTestPreconditions
import org.gradle.util.internal.VersionNumber
import org.hamcrest.CoreMatchers.allOf
import org.hamcrest.CoreMatchers.containsString
import org.hamcrest.CoreMatchers.equalTo
import org.hamcrest.MatcherAssert.assertThat
import org.junit.Assert.assertNotEquals
import org.junit.Test
import spock.lang.Issue


class GradleKotlinDslIntegrationTest : AbstractKotlinIntegrationTest() {

    @Test
    fun `given a buildscript block, it will be used to compute the runtime classpath`() {
        checkBuildscriptBlockIsUsedToComputeRuntimeClasspathAfter { it }
    }

    @Test
    fun `given a buildscript block separated by CRLF, it will be used to compute the runtime classpath`() {
        checkBuildscriptBlockIsUsedToComputeRuntimeClasspathAfter {
            it.replace("\r\n", "\n").replace("\n", "\r\n")
        }
    }

    private
    fun checkBuildscriptBlockIsUsedToComputeRuntimeClasspathAfter(buildscriptTransformation: (String) -> String) {

        withClassJar("fixture.jar", DeepThought::class.java)

        withBuildScript(
            """
            buildscript {
                dependencies { classpath(files("fixture.jar")) }
            }

            task("compute") {
                doLast {
                    val computer = ${DeepThought::class.qualifiedName}()
                    val answer = computer.compute()
                    println("*" + answer + "*")
                }
            }
            """.let(buildscriptTransformation)
        )

        assert(
            build("compute").output.contains("*42*")
        )
    }

    @Test
    fun `given a script plugin with a buildscript block, it will be used to compute its classpath`() {

        withClassJar("fixture.jar", DeepThought::class.java)

        withFile(
            "other.gradle.kts",
            """
            buildscript {
                dependencies { classpath(files("fixture.jar")) }
            }

            task("compute") {
                doLast {
                    val computer = ${DeepThought::class.qualifiedName}()
                    val answer = computer.compute()
                    println("*" + answer + "*")
                }
            }
            """
        )

        withBuildScript(
            """
            apply(from = "other.gradle.kts")
            """
        )

        assert(
            build("compute").output.contains("*42*")
        )
    }

    @Test
    fun `given a buildSrc dir, it will be added to the compilation classpath`() {

        withFile(
            "buildSrc/src/main/groovy/build/DeepThought.groovy",
            """
            package build
            class DeepThought {
                def compute() { 42 }
            }
            """
        )

        withBuildScript(
            """
            task("compute") {
                doLast {
                    val computer = build.DeepThought()
                    val answer = computer.compute()
                    println("*" + answer + "*")
                }
            }
            """
        )

        assert(
            build("compute").output.contains("*42*")
        )
    }

    @Test
    fun `given a Kotlin project in buildSrc, it will be added to the compilation classpath`() {

        withKotlinBuildSrc()

        withFile(
            "buildSrc/src/main/kotlin/build/DeepThought.kt",
            """
            package build

            class DeepThought() {
                fun compute(handler: (Int) -> Unit) { handler(42) }
            }
            """
        )

        withFile(
            "buildSrc/src/main/kotlin/build/DeepThoughtPlugin.kt",
            """
            package build

            import org.gradle.api.*
            import org.gradle.kotlin.dsl.*

            class DeepThoughtPlugin : Plugin<Project> {
                override fun apply(project: Project) {
                    project.run {
                        task("compute") {
                            doLast {
                                DeepThought().compute { answer ->
                                    println("*" + answer + "*")
                                }
                            }
                        }
                    }
                }
            }
            """
        )

        withBuildScript(
            """
            buildscript {
                // buildSrc types are available within buildscript
                // and must always be fully qualified
                build.DeepThought().compute { answer ->
                    println("buildscript: " + answer)
                }
            }
            apply<build.DeepThoughtPlugin>()
            """
        )

        val output = build("compute").output
        assert(output.contains("buildscript: 42"))
        assert(output.contains("*42*"))
    }

    @Test
    @Requires(
        IntegTestPreconditions.NotEmbeddedExecutor::class,
        reason = "Class path isolation, tested here, is not correct in embedded mode"
    )
    fun `can compile against a different (but compatible) version of the Kotlin compiler`() {
        val differentKotlinVersion = KotlinGradlePluginVersions().latestsStable.last { VersionNumber.parse(it) < VersionNumber.parse(embeddedKotlinVersion) }
        val expectedKotlinCompilerVersionString = differentKotlinVersion

        assertNotEquals(embeddedKotlinVersion, differentKotlinVersion)

        withBuildScript(
            """
            import org.jetbrains.kotlin.config.KotlinCompilerVersion
            import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

            buildscript {
                $repositoriesBlock
                dependencies {
                    classpath(kotlin("gradle-plugin", version = "$differentKotlinVersion"))
                }
            }

            apply(plugin = "kotlin")

            tasks.withType<KotlinCompile> {
                // can configure the Kotlin compiler
                compilerOptions.suppressWarnings = true
            }

            tasks.register("print-kotlin-version") {
                val kotlinCompilerVersion = KotlinCompilerVersion.VERSION
                val compileOptions = tasks.filterIsInstance<KotlinCompile>().joinToString(prefix="[", postfix="]") {
                    it.name + "=" + it.compilerOptions.suppressWarnings.get()
                }
                doLast {
                    println(kotlinCompilerVersion + compileOptions)
                }
            }
            """
        )

        assertThat(
            build("print-kotlin-version").output,
            containsString("$expectedKotlinCompilerVersionString[compileKotlin=true, compileTestKotlin=true]")
        )
    }

    @Test
    fun `can apply base plugin via plugins block`() {

        withBuildScript(
            """
            plugins {
                id("base")
            }

            task("plugins") {
                val appliedPlugins = plugins.map { "*" + it::class.simpleName + "*" }
                doLast {
                    println(appliedPlugins)
                }
            }
            """
        )

        assertThat(
            build("plugins").output,
            containsString("*BasePlugin_Decorated*")
        )
    }

    @Test
    @Issue("https://github.com/gradle/gradle/issues/24503")
    fun `can use configuration provider in dependencies block`() {

        withClassJar("fixture.jar", DeepThought::class.java)

        withBuildScript(
            """
            buildscript {
                val classpath2 = configurations.named("classpath")
                dependencies { classpath2(files("fixture.jar")) }
            }

            task("compute") {
                doLast {
                    val computer = ${DeepThought::class.qualifiedName}()
                    val answer = computer.compute()
                    println("*" + answer + "*")
                }
            }
            """
        )

        assert(
            build("compute").output.contains("*42*")
        )
    }

    @Test
    fun `can use Closure APIs`() {

        withBuildScript(
            """
            gradle.taskGraph.whenReady(closureOf<org.gradle.api.execution.TaskExecutionGraph> {
                println("*" + tasks.isEmpty() + "*") // <- TaskExecutionGraph.getTasks()
            })
            """
        )

        assert(
            build("build").output.contains("*false*")
        )
    }

    @Test
    fun `given an exception thrown during buildscript block execution, its stack trace should contain correct file and line info`() {
        executer.withStacktraceEnabled()
        withBuildScript(
            """ // line 1
            // line 2
            // line 3
            buildscript { // line 4
                throw IllegalStateException() // line 5
            }
            """
        )

        assertThat(
            buildFailureOutput(),
            containsString("build.gradle.kts:5")
        )
    }

    @Test
    fun `given a script with more than one buildscript block, it throws exception with offending block line number`() {

        withBuildScript(
            """ // line 1
            buildscript {}  // line 2
            buildscript {}  // line 3
            """
        )

        assertThat(
            buildFailureOutput(),
            containsString("build.gradle.kts:3:13: Unexpected `buildscript` block found. Only one `buildscript` block is allowed per script.")
        )
    }

    @Test
    fun `given a script with more than one plugins block, it throws exception with offending block line number`() {

        withBuildScript(
            """ // line 1
            plugins {}      // line 2
            plugins {}      // line 3
            """
        )

        assertThat(
            buildFailureOutput(),
            containsString("build.gradle.kts:3:13: Unexpected `plugins` block found. Only one `plugins` block is allowed per script.")
        )
    }

    @Test
    fun `given a buildscript block compilation error, it reports correct error location`() {

        assertCorrectLocationIsReportedForErrorIn("buildscript")
    }

    @Test
    fun `given a plugins block compilation error, it reports correct error location`() {

        assertCorrectLocationIsReportedForErrorIn("plugins")
    }

    private
    fun assertCorrectLocationIsReportedForErrorIn(block: String) {
        val buildFile =
            withBuildScript(
                """
                $block {
                    val module = "foo:bar:${'$'}fooBarVersion"
                }
                """
            )

        assertThat(
            buildFailureOutput("tasks"),
            containsString("e: ${clickableUrlFor(buildFile)}:3:44: Unresolved reference 'fooBarVersion'.")
        )
    }

    @Test
    fun `sub-project build script inherits parent project compilation classpath`() {

        withClassJar("fixture.jar", DeepThought::class.java)

        withBuildScript(
            """
            buildscript {
                dependencies { classpath(files("fixture.jar")) }
            }
            """
        )

        withSettings("include(\"sub-project\")")

        withBuildScriptIn(
            "sub-project",
            """
            task("compute") {
                doLast {
                    val computer = ${DeepThought::class.qualifiedName}()
                    val answer = computer.compute()
                    println("*" + answer + "*")
                }
            }
            """
        )

        assert(
            build(":sub-project:compute").output.contains("*42*")
        )
    }

    @Test
    fun `given non-existing build script file name set in settings do not fail`() {

        withSettings("rootProject.buildFileName = \"does-not-exist.gradle.kts\"")

        build("help")
    }

    @Test
    fun `build with groovy settings and kotlin-dsl build script succeeds`() {

        withFile(
            "settings.gradle",
            """
            println 'Groovy DSL Settings'
            """
        )

        withBuildScript(
            """
            println("Kotlin DSL Build Script")
            """
        )

        assertThat(
            build("help").output,
            allOf(
                containsString("Groovy DSL Settings"),
                containsString("Kotlin DSL Build Script")
            )
        )
    }

    @Test
    @Requires(UnitTestPreconditions.Jdk8OrEarlier::class)
    fun `build script can use jdk8 extensions`() {

        withBuildScript(
            """

            // without kotlin-stdlib-jdk8 we get:
            // > Retrieving groups by name is not supported on this platform.

            val regex = Regex("(?<bla>.*)")
            val groups = regex.matchEntire("abc")?.groups
            println("*" + groups?.get("bla")?.value + "*")

            """
        )

        assertThat(
            build("help").output,
            containsString("*abc*")
        )
    }

    @Test
    fun `settings script can use buildscript dependencies`() {

        withSettings(
            """
            buildscript {
                ${RepoScriptBlockUtil.mavenCentralRepository(GradleDsl.KOTLIN)}
                dependencies {
                    classpath("org.apache.commons:commons-lang3:3.6")
                }
            }

            println(org.apache.commons.lang3.StringUtils.reverse("Gradle"))
            """
        )

        assertThat(
            build("help").output,
            containsString("eldarG")
        )
    }

    @Test
    fun `script plugin can be applied to either Project or Settings`() {

        withFile(
            "common.gradle.kts",
            """
            fun Project.targetName() = "Project"
            fun Settings.targetName() = "Settings"
            println("Target is " + targetName())
            """
        )

        withSettings(
            """
            apply(from = "common.gradle.kts")
            """
        )

        assertThat(
            build("help").output,
            containsString("Target is Settings")
        )

        withSettings("")
        withBuildScript(
            """
            apply(from = "common.gradle.kts")
            """
        )

        assertThat(
            build("help").output,
            containsString("Target is Project")
        )
    }

    @Test
    fun `scripts can use the gradle script api`() {

        fun usageFor(target: String) = """

            logger.error("Error logging from $target")
            require(logging is LoggingManager, { "logging" })
            require(resources is ResourceHandler, { "resources" })

            require(relativePath("src/../settings.gradle.kts") == "settings.gradle.kts", { "relativePath(path)" })
            require(uri("settings.gradle.kts").toString().endsWith("settings.gradle.kts"), { "uri(path)" })
            require(file("settings.gradle.kts").isFile, { "file(path)" })
            require(files("settings.gradle.kts").files.isNotEmpty(), { "files(paths)" })
            require(fileTree(".") { include("*.kts") }.contains(file("settings.gradle.kts")), { "fileTree(path)" })
            require(copySpec {} != null, { "copySpec {}" })
            require(mkdir("some").isDirectory, { "mkdir(path)" })
            require(delete("some"), { "delete(path)" })
            require(delete {} != null, { "delete {}" })

        """

        withSettings(usageFor("Settings"))
        withBuildScript(usageFor("Project"))

        assertThat(
            build("help").error,
            allOf(
                containsString("Error logging from Settings"),
                containsString("Error logging from Project")
            )
        )
    }

    @Test
    fun `can use shorthand notation for bound callable references with inline functions in build scripts`() {

        withBuildScript(
            """
            fun foo(it: Any) = true

            // The inline modifier is important. This does not fail when this is no inline function.
            inline fun bar(f: (Any) -> Boolean) = print("*" + f(Unit) + "*")

            bar(::foo)
            """
        )

        assertThat(
            build().output,
            containsString("*true*")
        )
    }

    @Test
    fun `script compilation error message`() {

        val buildFile =
            withBuildScript("foo")

        assertThat(
            buildFailureOutput().normaliseLineSeparators(),
            containsMultiLineString(
                """
                FAILURE: Build failed with an exception.

                * Where:
                Build file '${buildFile.canonicalPath}' line: 1

                * What went wrong:
                Script compilation error:

                  Line 1: foo
                          ^ Unresolved reference 'foo'.

                1 error
                """
            )
        )
    }

    @Test
    fun `multiline script compilation error message`() {

        withBuildScript("publishing { }")

        assertThat(
            buildFailureOutput().normaliseLineSeparators(),
            containsMultiLineString(
            """
                * What went wrong:
                Script compilation error:

                  Line 1: publishing { }
                          ^ Unresolved reference. None of the following candidates is applicable because of a receiver type mismatch:
                              val PluginDependenciesSpec.publishing: PluginDependencySpec

                1 error
                """
            )
        )
    }

    @Test
    fun `multiple script compilation errors message`() {
        val buildFile = withBuildScript("println(foo)\n\n\n\n\nprintln(\"foo\").bar.bazar\n\n\n\nprintln(cathedral)")

        assertThat(
            buildFailureOutput().normaliseLineSeparators(),
            allOf(
                containsMultiLineString(
                    """
                    FAILURE: Build failed with an exception.

                    * Where:
                    Build file '${buildFile.canonicalPath}' line: 1

                    * What went wrong:
                    Script compilation errors:

                    """
                ),

                containsString(
                    """
                    |  Line 01: println(foo)
                    |                   ^ Unresolved reference 'foo'.
                    |
                    |  Line 06: println("foo").bar.bazar
                    |                          ^ Unresolved reference 'bar'.
                    |
                    |  Line 10: println(cathedral)
                    |                   ^ Unresolved reference 'cathedral'.
                    """.trimMargin()
                )
            )
        )
    }

    @Test
    fun `given a remote buildscript, file paths are resolved relative to root project dir`() {

        val remoteScript = """

            apply(from = "./gradle/answer.gradle.kts")

        """

        withFile(
            "gradle/answer.gradle.kts",
            """

            val answer by extra { "42" }

            """
        )

        MockWebServer().use { server ->

            server.enqueue(MockResponse().setBody(remoteScript))
            server.start()

            val remoteScriptUrl = server.safeUrl("/remote.gradle.kts")

            withBuildScript(
                """
                apply(from = "$remoteScriptUrl")
                val answer: String by extra
                println("*" + answer + "*")
                """
            )

            assert(build().output.contains("*42*"))
        }
    }

    private
    fun MockWebServer.safeUrl(path: String, scheme: String = "http"): HttpUrl? {
        return HttpUrl.Builder()
            .scheme(scheme)
            .host("127.0.0.1")
            .port(port)
            .build()
            .resolve(path)
    }

    @Test
    fun `given a script from a jar, file paths are resolved relative to root project dir`() {

        val scriptFromJar = """

            apply(from = "./gradle/answer.gradle.kts")

        """

        withZip(
            "fixture.jar",
            sequenceOf("common.gradle.kts" to scriptFromJar.toByteArray())
        )

        withFile(
            "gradle/answer.gradle.kts",
            """

            val answer by extra { "42" }

            """
        )

        withBuildScript(
            """
            buildscript {
                dependencies { classpath(files("fixture.jar")) }
            }

            apply(from = project.buildscript.classLoader.getResource("common.gradle.kts").toURI())

            val answer: String by extra
            println("*" + answer + "*")
            """
        )

        assert(build().output.contains("*42*"))
    }

    @Test
    fun `script handler belongs to the current script`() {

        val init = withFile(
            "some.init.gradle.kts",
            """
            println("init: ${'$'}{initscript.sourceFile}")
            """
        )

        val settings = withSettings(
            """
            println("settings: ${'$'}{buildscript.sourceFile}")
            """
        )

        val other = withFile(
            "other.gradle.kts",
            """
            println("other: ${'$'}{buildscript.sourceFile}")
            """
        )

        val main = withBuildScript(
            """
            apply(from = "other.gradle.kts")
            println("main: ${'$'}{buildscript.sourceFile}")
            """
        )

        assertThat(
            build("-I", init.absolutePath, "help", "-q").output,
            containsMultiLineString(
                """
                init: ${init.absolutePath}
                settings: ${settings.absolutePath}
                other: ${other.absolutePath}
                main: ${main.absolutePath}
                """
            )
        )
    }

    @Test
    fun `can cross configure buildscript`() {

        withClassJar("zero.jar", ZeroThought::class.java)
        withClassJar("light.jar", LightThought::class.java)
        withClassJar("deep.jar", DeepThought::class.java)

        val init = withFile(
            "some.init.gradle.kts",
            """
            projectsLoaded {
                rootProject.buildscript {
                    dependencies {
                        classpath(files("zero.jar"))
                    }
                }
            }
            """
        )

        withSettings(
            """
            include("sub")
            gradle.projectsLoaded {
                rootProject.buildscript {
                    dependencies {
                        classpath(files("light.jar"))
                    }
                }
            }
            """
        )

        withBuildScript(
            """
            project(":sub") {
                buildscript {
                    dependencies {
                        classpath(files("../deep.jar"))
                    }
                }
            }
            """
        )

        withFile(
            "sub/build.gradle.kts",
            """
            task("think") {
                doLast {
                    val zero = ${ZeroThought::class.qualifiedName}()
                    val light = ${LightThought::class.qualifiedName}()
                    val deep = ${DeepThought::class.qualifiedName}()
                    println("*" + zero.compute() + "*")
                    println("*" + light.compute() + "*")
                    println("*" + deep.compute() + "*")
                }
            }
            """
        )

        assertThat(
            build("-I", init.absolutePath, ":sub:think").output,
            containsMultiLineString(
                """
                *0*
                *23*
                *42*
                """
            )
        )
    }

    @Test
    @LeaksFileHandles("Kotlin Compiler Daemon working directory")
    fun `given generic extension types they can be accessed and configured`() {

        withDefaultSettingsIn("buildSrc")

        withFile(
            "buildSrc/build.gradle.kts",
            """

            plugins {
                `kotlin-dsl`
            }

            gradlePlugin {
                plugins {
                    register("my") {
                        id = "my"
                        implementationClass = "my.MyPlugin"
                    }
                }
            }

            $repositoriesBlock
            """
        )

        withFile(
            "buildSrc/src/main/kotlin/my/MyPlugin.kt",
            """
            package my

            import org.gradle.api.*
            import org.gradle.kotlin.dsl.*

            abstract class Book(val name: String)

            class MyPlugin : Plugin<Project> {
                override fun apply(project: Project): Unit = project.run {
                    extensions.add(typeOf<MutableMap<String, String>>(), "mapOfString", mutableMapOf("foo" to "bar"))
                    extensions.add(typeOf<MutableMap<String, Int>>(), "mapOfInt", mutableMapOf("deep" to 42))
                    extensions.add(typeOf<NamedDomainObjectContainer<Book>>(), "books", project.objects.domainObjectContainer(Book::class))
                }
            }
            """
        )

        withBuildScript(
            """
            plugins {
                id("my")
            }

            configure<MutableMap<String, String>> {
                put("bazar", "cathedral")
            }
            require(the<MutableMap<String, String>>() == mapOf("foo" to "bar", "bazar" to "cathedral"))

            configure<MutableMap<String, Int>> {
                put("zero", 0)
            }
            require(the<MutableMap<String, Int>>() == mapOf("deep" to 42, "zero" to 0))

            require(the<MutableMap<*, *>>() == mapOf("foo" to "bar", "bazar" to "cathedral"))

            configure<NamedDomainObjectContainer<my.Book>> {
                create("The Dosadi experiment")
            }
            require(the<NamedDomainObjectContainer<my.Book>>().size == 1)
            """
        )

        build("help")
    }

    @Test
    fun `can use kotlin java8 inline-only methods`() {

        withBuildScript(
            """
            task("test") {
                val v = project.properties.getOrDefault("non-existent-property", "default-value")
                doLast {
                    println(v)
                }
            }
            """
        )

        assertThat(
            build("-q", "test").output.trim(),
            equalTo("default-value")
        )
    }

    @Test
    fun `can apply script plugin with package name`() {

        withFile(
            "gradle/script.gradle.kts",
            """
            package gradle
            task("ok") { doLast { println("ok!") } }
            """
        )

        withBuildScript(
            """
            apply(from = "gradle/script.gradle.kts")
            """
        )

        assertThat(
            build("-q", "ok").output.trim(),
            equalTo("ok!")
        )
    }

    @Test
    fun `can run a simple task`() {
        withBuildScript(
            """
            import org.gradle.api.*
            import org.gradle.api.tasks.*

            open class SimpleTask : DefaultTask() {
                @TaskAction fun run() = println("it works!")
            }

            tasks.register<SimpleTask>("build")
            """
        )

        assertThat(
            build("-q", "build").output,
            containsString("it works!")
        )
    }

    @Test
    fun `can use project layout`() {
        withProjectRoot(newDir("project")) {
            withBuildScript(
                """
                println("Settings dir: " + layout.settingsDirectory)
                println("Project dir: " + layout.projectDirectory)
                """
            )
        }

        withSettings("""include("project")""")

        val output = build("-q", "build").output
        assertThat(
            output,
            allOf(
                containsString("Settings dir: $testDirectory"),
                containsString("Project dir: ${testDirectory.file("project")}")
            )
        )
    }

    @Test
    @LeaksFileHandles
    fun `can apply Groovy script from url`() {
        withOwnGradleUserHomeDir("we need an empty external resource cache") {
            val server = HttpServer()
            server.start()

            val scriptFile = withFile(
                "script.gradle",
                """
                task hello {
                    doLast {
                        println "Hello!"
                    }
                }
                """
            )

            withBuildScript(
                """
                apply {
                    from("${server.uri}/script.gradle")
                }
                """
            )

            server.expectGet("/script.gradle", scriptFile)

            assertThat(
                build("-q", "hello").output,
                containsString("Hello!")
            )

            server.stop()

            assertThat(
                build("--offline", "-q", "hello").output,
                containsString("Hello!")
            )
        }
    }

    @Test
    @LeaksFileHandles
    fun `can apply Kotlin script from url`() {
        withOwnGradleUserHomeDir("we need an empty external resource cache") {
            val server = HttpServer()
            server.start()

            val scriptFile = withFile(

                "script.gradle.kts",
                """
                tasks {
                    register("hello") {
                        doLast {
                            println("Hello!")
                        }
                    }
                }
                """
            )

            withBuildScript(
                """
            apply {
                from("${server.uri}/script.gradle.kts")
            }
            """
            )

            server.expectGet("/script.gradle.kts", scriptFile)

            assertThat(
                build("-q", "hello").output,
                containsString("Hello!")
            )

            server.stop()

            assertThat(
                build("--offline", "-q", "hello").output,
                containsString("Hello!")
            )
        }
    }

    @Test
    fun `can use Kotlin lambda as path notation`() {

        withBuildScript(
            """
            task("listFiles") {
                // via FileResolver
                val f = file { "cathedral" }
                // on FileCollection
                val collection = layout.files(
                    // single lambda
                    { "foo" },
                    // nested deferred
                    { { "bar" } },
                    // nested unpacking
                    { file({ "baz" }) },
                    // nested both
                    { { file({ { "bazaar" } }) } }
                )
                doLast {
                    println(f.name)
                    println(collection.files.map { it.name })
                }
            }
            """
        )

        assertThat(
            build("-q", "listFiles").output,
            allOf(
                containsString("cathedral"),
                containsString("[foo, bar, baz, bazaar]")
            )
        )
    }

    @Test
    fun `can use Kotlin lambda as input property`() {

        withBuildScript(
            """
            import org.gradle.api.*
            import org.gradle.api.tasks.*

            abstract class PrintInputToFile : DefaultTask() {
                @get:Internal
                abstract val inputSource: Property<String>
                @get:Input
                val input = { inputSource.get() }
                @get:OutputFile
                abstract val outputFile: RegularFileProperty

                @TaskAction fun run() {
                    outputFile.get().asFile.writeText(input() as String)
                }
            }

            tasks.register<PrintInputToFile>("writeInputToFile") {
                inputSource = providers.gradleProperty("inputString")
                outputFile = project.layout.buildDirectory.file("output.txt")
            }
            """
        )

        val taskName = ":writeInputToFile"

        build(taskName, "-PinputString=string1").assertTasksExecuted(taskName)

        build(taskName, "-PinputString=string1").assertTasksSkipped(taskName)

        build(taskName, "-PinputString=string2").assertTasksExecuted(taskName)
    }

    @Test
    @Issue("https://youtrack.jetbrains.com/issue/KT-36297")
    fun `can use Kotlin lambda as provider`() {
        val S = '$' // Workaround for a multi-line string that contains raw $ symbols.
        withBuildScript(
            """
            tasks {
                register<Task>("broken") {
                    val prop = objects.property(String::class.java)
                    // broken by https://youtrack.jetbrains.com/issue/KT-36297
                    prop.set(provider { "abc" })
                    doLast { println("$S{name} -> value = $S{prop.get()}") }
                }
                register<Task>("ok1") {
                    val prop = objects.property(String::class.java)
                    val function = { "abc" }
                    prop.set(provider(function))
                    doLast { println("$S{name} -> value = $S{prop.get()}") }
                }
            }
            tasks.register<Task>("ok2") {
                val prop = objects.property(String::class.java)
                prop.set(provider { "abc" })
                doLast { println("$S{name} -> value = $S{prop.get()}") }
            }
            """
        )

        assertThat(
            build("broken", "ok1", "ok2").output,
            allOf(
                containsString("broken -> value = abc"),
                containsString("ok1 -> value = abc"),
                containsString("ok2 -> value = abc"),
            )
        )
    }
}
