/*
 * Copyright 2010 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.util

import org.codehaus.groovy.control.CompilerConfiguration
import org.gradle.api.Task
import org.gradle.api.internal.AsmBackedClassGenerator
import org.gradle.api.internal.DefaultInstantiatorFactory
import org.gradle.api.internal.InstantiatorFactory
import org.gradle.api.internal.attributes.DefaultImmutableAttributesFactory
import org.gradle.api.internal.attributes.ImmutableAttributesFactory
import org.gradle.api.internal.changedetection.state.ValueSnapshotter
import org.gradle.api.internal.model.DefaultObjectFactory
import org.gradle.api.internal.model.NamedObjectInstantiator
import org.gradle.api.internal.project.ProjectInternal
import org.gradle.api.internal.project.taskfactory.ITaskFactory
import org.gradle.api.model.ObjectFactory
import org.gradle.cache.internal.CrossBuildInMemoryCacheFactory
import org.gradle.groovy.scripts.DefaultScript
import org.gradle.groovy.scripts.Script
import org.gradle.groovy.scripts.ScriptSource
import org.gradle.internal.classloader.ClassLoaderHierarchyHasher
import org.gradle.internal.event.DefaultListenerManager
import org.gradle.internal.hash.HashCode
import org.gradle.test.fixtures.file.TestDirectoryProvider
import org.gradle.testfixtures.ProjectBuilder
import org.gradle.testfixtures.internal.NativeServicesTestFixture

import java.rmi.server.UID

class TestUtil {
    public static final Closure TEST_CLOSURE = {}

    private final File rootDir;

    private TestUtil(File rootDir) {
        NativeServicesTestFixture.initialize()
        this.rootDir = rootDir;
    }

    static InstantiatorFactory instantiatorFactory() {
        def generator = new AsmBackedClassGenerator()
        return new DefaultInstantiatorFactory(generator, new CrossBuildInMemoryCacheFactory(new DefaultListenerManager()))
    }

    static ObjectFactory objectFactory() {
        return new DefaultObjectFactory(instantiatorFactory().decorate(), NamedObjectInstantiator.INSTANCE)
    }

    static ValueSnapshotter valueSnapshotter() {
        return new ValueSnapshotter(new ClassLoaderHierarchyHasher() {
            @Override
            HashCode getClassLoaderHash(ClassLoader classLoader) {
                return HashCode.fromInt(classLoader.hashCode())
            }
        }, NamedObjectInstantiator.INSTANCE)
    }

    static ImmutableAttributesFactory attributesFactory() {
        return new DefaultImmutableAttributesFactory(valueSnapshotter())
    }

    static TestUtil create(File rootDir) {
        return new TestUtil(rootDir);
    }

    static TestUtil create(TestDirectoryProvider testDirectoryProvider) {
        return new TestUtil(testDirectoryProvider.testDirectory);
    }

    public <T extends Task> T task(Class<T> type) {
        return createTask(type, createRootProject(this.rootDir))
    }

    public <T extends Task> T task(Class<T> type, Map taskFields) {
        def task = createTask(type, createRootProject(rootDir))
        hackInTaskProperties(type, task, taskFields)
        return task
    }

    private static void hackInTaskProperties(Class type, Task task, Map args) {
        args.each { k, v ->
            def field = type.getDeclaredFields().find { it.name == k }
            if (!field) {
                field = type.getSuperclass().getDeclaredFields().find { it.name == k }
            }
            if (field) {
                field.setAccessible(true)
                field.set(task, v)
            } else {
                //I'm feeling lucky
                task."$k" = v
            }
        }
    }

    static <T extends Task> T createTask(Class<T> type, ProjectInternal project) {
        return createTask(type, project, 'name')
    }

    static <T extends Task> T createTask(Class<T> type, ProjectInternal project, String name) {
        return project.services.get(ITaskFactory).createTask([name: name, type: type])
    }

    static ProjectBuilder builder(File rootDir) {
        return ProjectBuilder.builder().withProjectDir(rootDir);
    }

    static ProjectBuilder builder(TestDirectoryProvider temporaryFolder) {
        return builder(temporaryFolder.testDirectory);
    }

    ProjectInternal rootProject() {
        createRootProject(rootDir)
    }

    static ProjectInternal createRootProject(File rootDir) {
        return ProjectBuilder
            .builder()
            .withProjectDir(rootDir)
            .build()
    }

    static ProjectInternal createChildProject(ProjectInternal parent, String name, File projectDir = null) {
        return ProjectBuilder
            .builder()
            .withName(name)
            .withParent(parent)
            .withProjectDir(projectDir)
            .build();
    }

    static groovy.lang.Script createScript(String code) {
        new GroovyShell().parse(code)
    }

    static Object call(String text, Object... params) {
        toClosure(text).call(*params)
    }

    static Closure toClosure(String text) {
        return new GroovyShell().evaluate("return " + text)
    }

    static Closure toClosure(ScriptSource source) {
        CompilerConfiguration configuration = new CompilerConfiguration();
        configuration.setScriptBaseClass(TestScript.getName());

        GroovyShell shell = new GroovyShell(configuration)
        Script script = shell.parse(source.resource.text)
        script.setScriptSource(source)
        return script.run()
    }

    static Closure toClosure(TestClosure closure) {
        return { param -> closure.call(param) }
    }

    static Closure returns(Object value) {
        return { value }
    }

    static Closure createSetterClosure(String name, String value) {
        return {
            "set$name"(value)
        }
    }

    static String createUniqueId() {
        return new UID().toString();
    }

}


interface TestClosure {
    Object call(Object param);
}

abstract class TestScript extends DefaultScript {
}
