/*
 * 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.plugins.precompiled

import org.codehaus.groovy.runtime.StringGroovyMethods
import org.gradle.api.Plugin
import org.gradle.api.Project
import org.gradle.api.plugins.PluginManager
import org.gradle.integtests.fixtures.executer.ExecutionFailure
import org.gradle.kotlin.dsl.fixtures.FoldersDsl
import org.gradle.kotlin.dsl.fixtures.bytecode.InternalName
import org.gradle.kotlin.dsl.fixtures.bytecode.RETURN
import org.gradle.kotlin.dsl.fixtures.bytecode.internalName
import org.gradle.kotlin.dsl.fixtures.bytecode.publicClass
import org.gradle.kotlin.dsl.fixtures.bytecode.publicDefaultConstructor
import org.gradle.kotlin.dsl.fixtures.bytecode.publicMethod
import org.gradle.kotlin.dsl.fixtures.containsMultiLineString
import org.gradle.kotlin.dsl.fixtures.normalisedPath
import org.gradle.kotlin.dsl.fixtures.pluginDescriptorEntryFor
import org.gradle.kotlin.dsl.fixtures.zipTo
import org.gradle.test.fixtures.file.LeaksFileHandles
import org.gradle.test.precondition.Requires
import org.gradle.test.preconditions.TestExecutionPreconditions
import org.gradle.util.internal.TextUtil.replaceLineSeparatorsOf
import org.hamcrest.CoreMatchers.allOf
import org.hamcrest.CoreMatchers.containsString
import org.hamcrest.CoreMatchers.equalTo
import org.hamcrest.MatcherAssert.assertThat
import org.jetbrains.kotlin.descriptors.Visibilities
import org.jetbrains.kotlin.descriptors.Visibility
import org.jetbrains.kotlin.fir.analysis.checkers.toVisibilityOrNull
import org.jetbrains.kotlin.psi.psiUtil.visibilityModifierType
import org.junit.Assert.assertTrue
import org.junit.Ignore
import org.junit.Test
import org.mockito.kotlin.doAnswer
import org.mockito.kotlin.doReturn
import org.mockito.kotlin.inOrder
import org.mockito.kotlin.mock
import spock.lang.Issue
import java.io.File


@LeaksFileHandles("Kotlin Compiler Daemon working directory")
class PrecompiledScriptPluginAccessorsTest : AbstractPrecompiledScriptPluginTest() {

    @Test
    fun `cannot use type-safe accessors for extensions contributed in afterEvaluate`() {
        withFolders {
            "producer/src/main/kotlin" {
                withFile(
                    "producer.plugin.gradle.kts",
                    """
                        extensions.add("before", "before")
                        afterEvaluate {
                            extensions.add("after", "after")
                        }
                    """
                )
            }
            "consumer/src/main/kotlin" {
                withFile(
                    "consumer.plugin.gradle.kts",
                    """
                        plugins { id("producer.plugin") }
                        println(before) // ok
                        println(after) // compilation error
                    """
                )
            }
        }
        withDefaultSettings().appendText(
            """
                include("producer", "consumer")
            """
        )
        withKotlinDslPlugin().appendText(
            """
                subprojects {
                    apply(plugin = "org.gradle.kotlin.kotlin-dsl")
                    $repositoriesBlock
                }
                project(":consumer") {
                    dependencies {
                        implementation(project(":producer"))
                    }
                }
            """
        )

        buildAndFail("compileKotlin").apply {
            assertHasCause("Compilation error.")
            assertHasErrorOutput("Unresolved reference 'after'.")
        }
    }

    @Test
    fun `can use type-safe accessors for plugin relying on gradleProperty provider`() {

        withFolders {
            "buildSrc" {
                "gradlePropertyPlugin" {
                    withKotlinDslPlugin()
                    withFile(
                        "src/main/kotlin/gradlePropertyPlugin.gradle.kts",
                        """
                        val property = providers.gradleProperty("theGradleProperty")
                        if (property.isPresent) {
                            println("property is present in plugin!")
                        }
                        extensions.add<Provider<String>>(
                            "theGradleProperty",
                            property
                        )
                        """
                    )
                }
                "gradlePropertyPluginConsumer" {
                    withKotlinDslPlugin().appendText(
                        """
                        dependencies {
                            implementation(project(":gradlePropertyPlugin"))
                        }
                        """
                    )
                    withFile(
                        "src/main/kotlin/gradlePropertyPluginConsumer.gradle.kts",
                        """
                        plugins { id("gradlePropertyPlugin") }

                        if (theGradleProperty.isPresent) {
                            println("property is present in consumer!")
                        }
                        """
                    )
                }

                withDefaultSettingsIn(relativePath).appendText(
                    """
                    include("gradlePropertyPlugin")
                    include("gradlePropertyPluginConsumer")
                    """
                )
                withBuildScriptIn(
                    relativePath,
                    """
                    plugins { `java-library` }
                    dependencies {
                        subprojects.forEach {
                            runtimeOnly(project(it.path))
                        }
                    }
                    """
                )
            }
        }

        withBuildScript(
            """
            plugins { gradlePropertyPluginConsumer }
            """
        )

        build("help", "-PtheGradleProperty=42").apply {
            assertThat(
                output.count("property is present in plugin!"),
                equalTo(1) // not printed when building buildSrc
            )
            assertThat(
                output.count("property is present in consumer!"),
                equalTo(1)
            )
        }
    }

    @Test
    fun `can use type-safe accessors for applied plugins with CRLF line separators`() {

        withKotlinDslPlugin()

        withPrecompiledKotlinScript(
            "my-java-library.gradle.kts",
            replaceLineSeparatorsOf(
                """
                plugins { java }

                java { }

                tasks.compileJava { }
                """,
                "\r\n"
            )
        )

        compileKotlin()
    }

    @Test
    fun `fails the build with help message for plugin spec with version`() {

        withDefaultSettings().appendText(
            """
            rootProject.name = "invalid-plugin"
            """
        )

        withKotlinDslPlugin()

        withPrecompiledKotlinScript(
            "invalid-plugin.gradle.kts",
            """
            plugins {
                id("a.plugin") version "1.0"
            }
            """
        )

        assertThat(
            buildFailureOutput("assemble"),
            containsMultiLineString(
                """
                Invalid plugin request [id: 'a.plugin', version: '1.0']. Plugin requests from precompiled scripts must not include a version number. Please remove the version from the offending request. Make sure the module containing the requested plugin 'a.plugin' is an implementation dependency of root project 'invalid-plugin'.
                """
            )
        )
    }

    @Issue("https://github.com/gradle/gradle/issues/17246")
    @Test
    fun `fails the build with help message for a usage of an invalid plugin spec with version in settings plugin`() {

        withDefaultSettings().appendText(
            """
            rootProject.name = "invalid-plugin"
            """
        )

        withKotlinDslPlugin()

        withPrecompiledKotlinScript(
            "invalid-plugin.settings.gradle.kts",
            """
            plugins {
                id("a.plugin") version "1.0"
            }
            """
        )

        executer.expectDocumentedDeprecationWarning(
            "Using 'version' in precompiled settings script plugins has been deprecated. This will fail with an error in Gradle 10. " +
                "The version of the plugin is determined by the dependency in the precompiled script plugin's build file. " +
                "Remove 'version' from the plugin request for 'a.plugin' in 'src/main/kotlin/invalid-plugin.settings.gradle.kts'. " +
                "Consult the upgrading guide for further information: https://docs.gradle.org/current/userguide/upgrading_version_9.html#deprecate_version_in_precompiled_settings_script_plugins"
        )
        buildAndFail("assemble").assertHasErrorOutput(
            "Plugin [id: 'a.plugin'] was not found in any of the following sources:"
        )
    }

    @Issue("https://github.com/gradle/gradle/issues/17246")
    @Test
    fun `raises a deprecation warning with help message for a valid plugin spec with version in settings plugin`() {

        withFolders {
            "settings-plugin" {
                withDefaultSettingsIn(relativePath)
                withKotlinDslPlugin()

                withFile("src/main/kotlin/valid.plugin.settings.gradle.kts").appendText("println(\"applying valid.plugin\")")
            }
        }

        withDefaultSettings().appendText(
            """
            rootProject.name = "valid-plugin-with-version"

            includeBuild("settings-plugin")
            """
        )

        withFile("build.gradle.kts").appendText("""
            ${scriptWithKotlinDslPlugin()}

            dependencies {
                implementation(project(":settings-plugin"))
            }
        """.trimIndent())

        withPrecompiledKotlinScript(
            "valid-plugin-with-version.settings.gradle.kts",
            """
            plugins {
                id("valid.plugin") version "1.0"
            }
            """
        )

        executer.expectDocumentedDeprecationWarning(
            "Using 'version' in precompiled settings script plugins has been deprecated. This will fail with an error in Gradle 10. " +
                "The version of the plugin is determined by the dependency in the precompiled script plugin's build file. " +
                "Remove 'version' from the plugin request for 'valid.plugin' in 'src/main/kotlin/valid-plugin-with-version.settings.gradle.kts'. " +
                "Consult the upgrading guide for further information: https://docs.gradle.org/current/userguide/upgrading_version_9.html#deprecate_version_in_precompiled_settings_script_plugins"
        )

        build("assemble").assertNotOutput("applying valid.plugin")
    }


    @Issue("https://github.com/gradle/gradle/issues/14437")
    @Test
    fun `raises a deprecation warning with help message for plugin spec with apply false`() {

        withDefaultSettings().appendText(
            """
            rootProject.name = "invalid-plugin"
            """
        )

        withKotlinDslPlugin()

        withPrecompiledKotlinScript(
            "a.plugin.gradle.kts",
            ""
        )

        withPrecompiledKotlinScript(
            "invalid-plugin.gradle.kts",
            """
            plugins {
                id("a.plugin") apply false
            }
            """
        )

        executer.expectDocumentedDeprecationWarning(
            "'apply false' in precompiled script plugins has been deprecated. This will fail with an error in Gradle 10. " +
                "'apply false' does not do anything as the plugin will already be added to the classpath when added as a dependency to the precompiled script plugin's build file. " +
                "Remove 'apply false' from the plugin request for 'a.plugin' in 'src/main/kotlin/invalid-plugin.gradle.kts'. " +
                "Consult the upgrading guide for further information: https://docs.gradle.org/current/userguide/upgrading_version_9.html#deprecate_apply_false_in_precompiled_script_plugins"
        )
        build("assemble")
    }

    @Issue("https://github.com/gradle/gradle/issues/17246")
    @Test
    fun `raises a deprecation warning with help message for plugin spec with apply false in settings plugin`() {

        withDefaultSettings().appendText(
            """
            rootProject.name = "invalid-plugin"
            """
        )

        withKotlinDslPlugin()

        withPrecompiledKotlinScript(
            "a.plugin.settings.gradle.kts",
            ""
        )

        withPrecompiledKotlinScript(
            "invalid-plugin.settings.gradle.kts",
            """
            plugins {
                id("a.plugin") apply false
            }
            """
        )

        executer.expectDocumentedDeprecationWarning(
            "'apply false' in precompiled script plugins has been deprecated. This will fail with an error in Gradle 10. " +
                "'apply false' does not do anything as the plugin will already be added to the classpath when added as a dependency to the precompiled script plugin's build file. " +
                "Remove 'apply false' from the plugin request for 'a.plugin' in 'src/main/kotlin/invalid-plugin.settings.gradle.kts'. " +
                "Consult the upgrading guide for further information: https://docs.gradle.org/current/userguide/upgrading_version_9.html#deprecate_apply_false_in_precompiled_script_plugins"
        )
        build("assemble")
    }

    @Test
    fun `can use type-safe accessors with same name but different meaning in sibling plugins`() {

        val externalPlugins = withExternalPlugins()

        withFolders {
            "buildSrc" {
                withDefaultSettingsIn(relativePath)
                withKotlinDslPlugin().appendText(
                    implementationDependencyOn(externalPlugins)
                )

                withFile(
                    "src/main/kotlin/local-app.gradle.kts",
                    """
                    plugins { `external-app` }
                    println("*using " + external.name + " from local-app in " + project.name + "*")
                    """
                )

                withFile(
                    "src/main/kotlin/local-lib.gradle.kts",
                    """
                    plugins { `external-lib` }
                    println("*using " + external.name + " from local-lib in " + project.name + "*")
                    """
                )
            }
        }

        withDefaultSettings().appendText(
            """
            include("foo")
            include("bar")
            """
        )

        withFolders {
            "foo" {
                withFile(
                    "build.gradle.kts",
                    """
                    plugins { `local-app` }
                    """
                )
            }
            "bar" {
                withFile(
                    "build.gradle.kts",
                    """
                    plugins { `local-lib` }
                    """
                )
            }
        }

        assertThat(
            build("tasks").output,
            allOf(
                containsString("*using app from local-app in foo*"),
                containsString("*using lib from local-lib in bar*")
            )
        )
    }

    private
    fun implementationDependencyOn(file: File): String = """
        dependencies {
            implementation(files("${file.normalisedPath}"))
        }
    """

    @Test
    @Requires(
        TestExecutionPreconditions.NotEmbeddedExecutor::class,
        reason = "Unknown issue with accessing the plugin portal from pre-compiled script plugin in embedded test mode"
    )
    fun `can use type-safe accessors for the Kotlin Gradle plugin extensions`() {

        withKotlinDslPlugin().appendText(
            """
            dependencies {
                implementation(kotlin("gradle-plugin"))
            }
            """
        )

        withPrecompiledKotlinScript(
            "kotlin-library.gradle.kts",
            """

            plugins { kotlin("jvm") }

            kotlin { }

            tasks.compileKotlin { compilerOptions { } }

            """
        )

        build("generatePrecompiledScriptPluginAccessors")

        compileKotlin()
    }

    @Test
    fun `can use type-safe accessors for plugins applied by sibling plugin`() {

        withKotlinDslPlugin()

        withPrecompiledKotlinScript(
            "my-java-library.gradle.kts",
            """
            plugins { java }
            """
        )

        withPrecompiledKotlinScript(
            "my-java-module.gradle.kts",
            """
            plugins { id("my-java-library") }

            java { }

            tasks.compileJava { }
            """
        )

        compileKotlin()
    }

    @Test
    fun `can use type-safe accessors from scripts with same name but different ids`() {

        val externalPlugins = withExternalPlugins()

        withKotlinDslPlugin()
        withKotlinBuildSrc()
        withFolders {
            "buildSrc" {
                existing("build.gradle.kts").appendText(
                    implementationDependencyOn(externalPlugins)
                )
                "src/main/kotlin" {
                    withFile(
                        "app/model.gradle.kts",
                        """
                        package app
                        plugins { `external-app` }
                        println("*using " + external.name + " from app/model in " + project.name + "*")
                        """
                    )
                    withFile(
                        "lib/model.gradle.kts",
                        """
                        package lib
                        plugins { `external-lib` }
                        println("*using " + external.name + " from lib/model in " + project.name + "*")
                        """
                    )
                }
            }
        }

        withDefaultSettings().appendText(
            """
            include("lib")
            include("app")
            """
        )

        withFolders {
            "lib" {
                withFile(
                    "build.gradle.kts",
                    """
                    plugins { lib.model }
                    """
                )
            }
            "app" {
                withFile(
                    "build.gradle.kts",
                    """
                    plugins { app.model }
                    """
                )
            }
        }

        assertThat(
            build("tasks").output,
            allOf(
                containsString("*using app from app/model in app*"),
                containsString("*using lib from lib/model in lib*")
            )
        )
    }

    @Test
    fun `can apply sibling plugin whether it has a plugins block or not`() {

        withKotlinDslPlugin()

        withPrecompiledKotlinScript("no-plugins.gradle.kts", "")
        withPrecompiledKotlinScript(
            "java-plugin.gradle.kts",
            """
            plugins { java }
            """
        )

        withPrecompiledKotlinScript(
            "plugins.gradle.kts",
            """
            plugins {
                id("no-plugins")
                id("java-plugin")
            }

            java { }

            tasks.compileJava { }
            """
        )

        compileKotlin()
    }

    @Test
    fun `can apply sibling plugin from another package`() {

        withKotlinDslPlugin()

        withPrecompiledKotlinScript(
            "my/java-plugin.gradle.kts",
            """
            package my
            plugins { java }
            """
        )

        withPrecompiledKotlinScript(
            "plugins.gradle.kts",
            """
            plugins { id("my.java-plugin") }

            java { }

            tasks.compileJava { }
            """
        )

        compileKotlin()
    }

    @Test
    fun `generated type-safe accessors are internal`() {

        givenPrecompiledKotlinScript(
            "java-project.gradle.kts",
            """
            plugins { java }
            """
        )

        val generatedSourceFiles =
            existing("build/generated-sources")
                .walkTopDown()
                .filter { it.isFile }
                .toList()

        assertTrue(
            generatedSourceFiles.isNotEmpty()
        )

        data class Declaration(
            val packageName: String,
            val name: String,
            val visibility: Visibility?
        )

        val generatedAccessors =
            KotlinParser.run {
                withPsiManager {
                    generatedSourceFiles.flatMap { file ->
                        parse(file.name, file.readText()).run {
                            val packageName = packageFqName.asString()
                            declarations.map { declaration ->
                                Declaration(
                                    packageName,
                                    declaration.name!!,
                                    declaration.visibilityModifierType()?.toVisibilityOrNull()
                                )
                            }
                        }
                    }
                }
            }

        assertThat(
            "Only the generated Gradle Plugin wrapper is not internal",
            generatedAccessors.filterNot { it.visibility == Visibilities.Internal },
            equalTo(
                listOf(
                    Declaration(
                        "",
                        "JavaProjectPlugin",
                        Visibilities.Public
                    )
                )
            )
        )
    }

    @Test
    fun `can use core plugin spec builders`() {

        givenPrecompiledKotlinScript(
            "java-project.gradle.kts",
            """

            plugins {
                java
            }

            """
        )

        val (project, pluginManager) = projectAndPluginManagerMocks()

        instantiatePrecompiledScriptOf(
            project,
            "Java_project_gradle"
        )

        inOrder(pluginManager) {
            verify(pluginManager).apply("org.gradle.java")
            verifyNoMoreInteractions()
        }
    }

    @Test
    fun `can use plugin spec builders for plugins in the implementation classpath`() {

        // given:
        val pluginId = "my.plugin"
        val pluginJar = jarForPlugin(pluginId, "MyPlugin")

        withPrecompiledScriptApplying(pluginId, pluginJar)
        assertPrecompiledScriptPluginApplies(
            pluginId,
            "Plugin_gradle"
        )
    }

    private
    fun assertPrecompiledScriptPluginApplies(pluginId: String, precompiledScriptClassName: String) {

        compileKotlin()

        val (project, pluginManager) = projectAndPluginManagerMocks()

        instantiatePrecompiledScriptOf(
            project,
            precompiledScriptClassName
        )

        inOrder(pluginManager) {
            verify(pluginManager).apply(pluginId)
            verifyNoMoreInteractions()
        }
    }

    @Test
    @Ignore("there is no jruby-gradle-plugin that works without conventions or dependencies are missing. https://github.com/jruby-gradle/jruby-gradle-plugin/issues/451")
    fun `can use plugin specs with jruby-gradle-plugin`() {

        withKotlinDslPlugin().appendText(
            """
            dependencies {
                implementation("com.github.jruby-gradle:jruby-gradle-plugin:1.4.0")
            }
            """
        )

        withPrecompiledKotlinScript(
            "plugin.gradle.kts",
            """
            plugins {
                com.github.`jruby-gradle`.base
            }
            """
        )

        executer.expectDocumentedDeprecationWarning(
            "Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated. " +
                "This is scheduled to be removed in Gradle 10. Use assignment ('group = <value>') instead. " +
                "Consult the upgrading guide for further information: https://docs.gradle.org/current/userguide/upgrading_version_8.html#groovy_space_assignment_syntax"
        )
        executer.expectDocumentedDeprecationWarning(
            "Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated. " +
                "This is scheduled to be removed in Gradle 10. Use assignment ('description = <value>') instead. " +
                "Consult the upgrading guide for further information: https://docs.gradle.org/current/userguide/upgrading_version_8.html#groovy_space_assignment_syntax"
        )

        assertPrecompiledScriptPluginApplies(
            "com.github.jruby-gradle.base",
            "Plugin_gradle"
        )
    }

    @Test
    fun `plugin application errors fail the build`() {

        val pluginId = "invalid.plugin"
        val pluginJar = jarWithInvalidPlugin(pluginId, "InvalidPlugin")

        withPrecompiledScriptApplying(pluginId, pluginJar)

        val assertions: ExecutionFailure.() -> Unit = {
            assertHasFailure("An exception occurred applying plugin request [id: '$pluginId']") {
                assertHasCause("'InvalidPlugin' is neither a plugin or a rule source and cannot be applied.")
            }
        }

        gradleExecuterFor(arrayOf("classes"))
            .withStackTraceChecksDisabled()
            .runWithFailure()
            .assertions()
    }

    private
    fun withPrecompiledScriptApplying(pluginId: String, pluginJar: File) {

        withKotlinDslPlugin().appendText(
            """

            dependencies {
                implementation(files("${pluginJar.normalisedPath}"))
            }

            """
        )

        withPrecompiledKotlinScript(
            "plugin.gradle.kts",
            """

            plugins { $pluginId }

            """
        )
    }

    @Test
    fun `can use plugin spec builders in multi-project builds with local and external plugins`() {

        testPluginSpecBuildersInMultiProjectBuildWithPluginsFromPackage(null)
    }

    @Test
    fun `can use plugin spec builders in multi-project builds with local and external plugins sharing package name`() {

        testPluginSpecBuildersInMultiProjectBuildWithPluginsFromPackage("p")
    }

    private
    fun testPluginSpecBuildersInMultiProjectBuildWithPluginsFromPackage(packageName: String?) {

        val packageDeclaration = packageName?.let { "package $it" } ?: ""
        val packageQualifier = packageName?.let { "$it." } ?: ""

        withProjectRoot(newDir("external-plugins")) {
            withFolders {
                "external-foo" {
                    withKotlinDslPlugin()
                    withFile(
                        "src/main/kotlin/external-foo.gradle.kts",
                        """
                        $packageDeclaration
                        println("*external-foo applied*")
                        """
                    )
                }
                "external-bar" {
                    withKotlinDslPlugin()
                    withFile(
                        "src/main/kotlin/external-bar.gradle.kts",
                        """
                        $packageDeclaration
                        println("*external-bar applied*")
                        """
                    )
                }
                withDefaultSettingsIn(relativePath).appendText(
                    """
                    include("external-foo", "external-bar")
                    """
                )
            }
            build("assemble")
        }

        val externalFoo = existing("external-plugins/external-foo/build/libs/external-foo.jar")
        val externalBar = existing("external-plugins/external-bar/build/libs/external-bar.jar")

        withFolders {
            "buildSrc" {
                "local-foo" {
                    withFile(
                        "src/main/kotlin/local-foo.gradle.kts",
                        """
                        $packageDeclaration
                        plugins { $packageQualifier`external-foo` }
                        """
                    )
                    withKotlinDslPlugin().appendText(
                        """
                        dependencies {
                            implementation(files("${externalFoo.normalisedPath}"))
                        }
                        """
                    )
                }
                "local-bar" {
                    withFile(
                        "src/main/kotlin/local-bar.gradle.kts",
                        """
                        $packageDeclaration
                        plugins { $packageQualifier`external-bar` }
                        """
                    )
                    withKotlinDslPlugin().appendText(
                        """
                        dependencies {
                            implementation(files("${externalBar.normalisedPath}"))
                        }
                        """
                    )
                }
                withDefaultSettingsIn(relativePath).appendText(
                    """
                    include("local-foo", "local-bar")
                    """
                )
                withFile(
                    "build.gradle.kts",
                    """
                    dependencies {
                        subprojects.forEach {
                            runtimeOnly(project(it.path))
                        }
                    }
                    """
                )
            }
        }
        withBuildScript(
            """
            plugins {
                $packageQualifier`local-foo`
                $packageQualifier`local-bar`
            }
            """
        )

        assertThat(
            build("tasks").output,
            allOf(
                containsString("*external-foo applied*"),
                containsString("*external-bar applied*")
            )
        )
    }

    private
    fun withExternalPlugins(): File =
        withProjectRoot(newDir("external-plugins")) {
            withDefaultSettings()
            withKotlinDslPlugin()
            withFolders {
                "src/main/kotlin" {
                    "extensions" {
                        withFile(
                            "Extensions.kt",
                            """
                            open class App { var name: String = "app" }
                            open class Lib { var name: String = "lib" }
                            """
                        )
                    }
                    withFile(
                        "external-app.gradle.kts",
                        """
                        extensions.create("external", App::class)
                        """
                    )
                    withFile(
                        "external-lib.gradle.kts",
                        """
                        extensions.create("external", Lib::class)
                        """
                    )
                }
            }
            build("assemble")
            existing("build/libs/external-plugins.jar")
        }

    private
    fun FoldersDsl.withKotlinDslPlugin(): File =
        withKotlinDslPluginIn(relativePath)

    private
    val FoldersDsl.relativePath
        get() = root.relativeTo(projectRoot).path

    private
    fun jarWithInvalidPlugin(id: String, implClass: String): File =
        pluginJarWith(
            pluginDescriptorEntryFor(id, implClass),
            "$implClass.class" to publicClass(InternalName(implClass))
        )

    private
    fun jarForPlugin(id: String, implClass: String): File =
        pluginJarWith(
            pluginDescriptorEntryFor(id, implClass),
            "$implClass.class" to emptyPluginClassNamed(implClass)
        )

    private
    fun emptyPluginClassNamed(implClass: String): ByteArray =
        publicClass(InternalName(implClass), interfaces = listOf(Plugin::class.internalName)) {
            publicDefaultConstructor()
            publicMethod("apply", "(Ljava/lang/Object;)V") {
                RETURN()
            }
        }

    private
    fun pluginJarWith(vararg entries: Pair<String, ByteArray>): File =
        newFile("my.plugin.jar").also { file ->
            zipTo(file, entries.asSequence())
        }

    private
    fun projectAndPluginManagerMocks(): Pair<Project, PluginManager> {
        val pluginManager = mock<PluginManager>()
        val project = mock<Project> {
            on { getPluginManager() } doReturn pluginManager
            on { project } doAnswer { it.mock as Project }
        }
        return Pair(project, pluginManager)
    }

    private
    fun CharSequence.count(text: CharSequence): Int =
        StringGroovyMethods.count(this, text)
}
