/*
 * 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.api.internal

import com.google.common.collect.Lists
import org.gradle.api.*
import org.gradle.api.tasks.AbstractTaskTest
import org.gradle.api.tasks.TaskDependency
import org.gradle.api.tasks.TaskExecutionException
import org.gradle.api.tasks.TaskInstantiationException
import org.gradle.internal.Actions
import org.gradle.internal.event.ListenerManager
import org.gradle.util.WrapUtil
import org.jmock.Expectations
import org.junit.After
import org.junit.Before
import org.junit.Rule
import org.junit.Test
import org.junit.rules.ExpectedException
import spock.lang.Issue

import java.util.concurrent.Callable

import static org.gradle.api.tasks.TaskDependencyMatchers.dependsOn
import static org.gradle.util.Matchers.isEmpty
import static org.hamcrest.Matchers.*
import static org.junit.Assert.*

class DefaultTaskTest extends AbstractTaskTest {
    ClassLoader cl
    DefaultTask defaultTask

    Object testCustomPropValue;

    @Before
    public void setUp() {
        testCustomPropValue = new Object()
        defaultTask = createTask(DefaultTask.class)
        cl = Thread.currentThread().contextClassLoader
    }

    @After
    public void cleanup() {
        Thread.currentThread().contextClassLoader = cl
    }

    AbstractTask getTask() {
        defaultTask
    }

    @Test
    public void testDefaultTask() {
        DefaultTask task = AbstractTask.injectIntoNewInstance(project, TEST_TASK_NAME, { new DefaultTask() } as Callable)
        assertThat(task.dependsOn, isEmpty())
        assertEquals([], task.actions)
    }

    @Test
    public void testHasUsefulToString() {
        assertEquals('task \':testTask\'', task.toString())
    }

    @Test
    public void testCanInjectValuesIntoTaskWhenUsingNoArgsConstructor() {
        DefaultTask task = AbstractTask.injectIntoNewInstance(project, TEST_TASK_NAME, { new DefaultTask() } as Callable)
        assertThat(task.project, sameInstance(project))
        assertThat(task.name, equalTo(TEST_TASK_NAME))
    }

    @Test
    public void testDependsOn() {
        Task dependsOnTask = createTask(project, "somename");
        Task task = createTask(project, TEST_TASK_NAME);
        project.getTasks().create("path1");
        project.getTasks().create("path2");

        task.dependsOn(Project.PATH_SEPARATOR + "path1");
        assertThat(task, dependsOn("path1"));
        task.dependsOn("path2", dependsOnTask);
        assertThat(task, dependsOn("path1", "path2", "somename"));
    }

    @Test
    public void testMustRunAfter() {
        Task mustRunAfterTask = createTask(project, "mustRunAfter")
        Task mustRunAfterTaskUsingPath = project.getTasks().create("path")
        Task task = createTask(project, TEST_TASK_NAME)

        task.mustRunAfter(mustRunAfterTask, "path")
        assert task.mustRunAfter.getDependencies(task) == [mustRunAfterTask, mustRunAfterTaskUsingPath] as Set
    }

    @Test
    public void testFinalizedBy() {
        Task finalizer = createTask(project, "finalizer")
        Task finalizerFromPath = project.getTasks().create("path")
        Task finalized = createTask(project, TEST_TASK_NAME)

        finalized.finalizedBy(finalizer, "path")
        assert finalized.finalizedBy.getDependencies(finalized) == [finalizer, finalizerFromPath] as Set
    }

    @Test
    public void testSetFinalizedBy() {
        Task finalizer = createTask(project, "finalizer")
        Task finalizerFromPath = project.getTasks().create("path")
        Task finalized = createTask(project, TEST_TASK_NAME)

        finalized.finalizedBy = [finalizer, "path"]
        assert finalized.finalizedBy.getDependencies(finalized) == [finalizer, finalizerFromPath] as Set
    }

    @Test
    void testShouldRunAfter() {
        Task shouldRunAfterTask = createTask(project, "shouldRunAfter")
        Task shouldRunAfterFromPath = project.getTasks().create("path")
        Task task = createTask(project, TEST_TASK_NAME)

        task.shouldRunAfter(shouldRunAfterTask, shouldRunAfterFromPath)
        assert task.shouldRunAfter.getDependencies(task) == [shouldRunAfterTask, shouldRunAfterFromPath] as Set
    }

    @Test
    void testSetShouldRunAfter() {
        Task shouldRunAfterTask = createTask(project, "shouldRunAfter")
        Task shouldRunAfterFromPath = project.getTasks().create("path")
        Task task = createTask(project, TEST_TASK_NAME)

        task.shouldRunAfter = [shouldRunAfterTask, shouldRunAfterFromPath]
        assert task.shouldRunAfter.getDependencies(task) == [shouldRunAfterTask, shouldRunAfterFromPath] as Set
    }

    @Test
    public void testConfigure() {
        Closure action1 = { Task t -> }
        assertSame(task, task.configure {
            doFirst(action1)
        });
        assertEquals(1, task.actions.size())
    }

    @Test
    public void testDoFirstAddsActionToTheStartOfActionsList() {
        Action<Task> action1 = Actions.doNothing();
        Action<Task> action2 = Actions.doNothing();

        assertSame(defaultTask, defaultTask.doFirst(action1));
        assertEquals(1, defaultTask.actions.size());

        assertSame(defaultTask, defaultTask.doFirst(action2));
        assertEquals(2, defaultTask.actions.size());

        assertSame(action2, defaultTask.actions[0].action)
        assertSame(action1, defaultTask.actions[1].action)
    }

    @Test
    public void testDoLastAddsActionToTheEndOfActionsList() {
        Action<Task> action1 = Actions.doNothing();
        Action<Task> action2 = Actions.doNothing();

        assertSame(defaultTask, defaultTask.doLast(action1));
        assertEquals(1, defaultTask.actions.size());

        assertSame(defaultTask, defaultTask.doLast(action2));
        assertEquals(2, defaultTask.actions.size());

        assertSame(action1, defaultTask.actions[0].action)
        assertSame(action2, defaultTask.actions[1].action)
    }

    @Test
    public void testSetsContextClassLoaderWhenExecutingAction() {
        Action<Task> testAction = context.mock(Action)
        context.checking {
            one(testAction).execute(defaultTask)
            will {
                assert Thread.currentThread().contextClassLoader == testAction.getClass().classLoader
            }
        }

        defaultTask.doFirst(testAction)

        Thread.currentThread().contextClassLoader = new ClassLoader(getClass().classLoader) {}
        defaultTask.actions[0].execute(defaultTask)
    }

    @Test
    public void testClosureActionDelegatesToTask() {
        Closure testAction = {
            assert delegate == defaultTask
            assert resolveStrategy == Closure.DELEGATE_FIRST
        }
        defaultTask.doFirst(testAction)
        defaultTask.actions[0].execute(defaultTask)
    }

    @Test
    public void testSetsContextClassLoaderWhenRunningClosureAction() {
        Closure testAction = {
            assert Thread.currentThread().contextClassLoader == getClass().classLoader
        }

        defaultTask.doFirst(testAction)

        Thread.currentThread().contextClassLoader = new ClassLoader(getClass().classLoader) {}
        defaultTask.actions[0].execute(defaultTask)
    }

    @Test
    public void testDoFirstWithClosureAddsActionToTheStartOfActionsList() {
        Closure testAction1 = {}
        Closure testAction2 = {}
        Closure testAction3 = {}
        defaultTask.doLast(testAction1)
        defaultTask.doLast(testAction2)
        defaultTask.doLast(testAction3)

        assertSame(defaultTask.actions[0].closure, testAction1)
        assertSame(defaultTask.actions[1].closure, testAction2)
        assertSame(defaultTask.actions[2].closure, testAction3)
    }

    @Test
    public void testDoLastWithClosureAddsActionToTheEndOfActionsList() {
        Closure testAction1 = {}
        Closure testAction2 = {}
        Closure testAction3 = {}
        defaultTask.doFirst(testAction1)
        defaultTask.doFirst(testAction2)
        defaultTask.doFirst(testAction3)

        assertSame(defaultTask.actions[0].closure, testAction3)
        assertSame(defaultTask.actions[1].closure, testAction2)
        assertSame(defaultTask.actions[2].closure, testAction1)
    }

    @Issue("GRADLE-2774")
    @Test
    public void testActionToActionsAndExecute() {
        def actionExecuted = false
        def closureAction = { t -> actionExecuted = true } as Action
        defaultTask.actions.add(closureAction)
        execute(defaultTask)
        assertTrue(actionExecuted)
    }

    @Issue("GRADLE-2774")
    @Test
    public void testAddAllActionToActionsAndExecute() {
        def actionExecuted = false
        def closureAction = { t -> actionExecuted = true } as Action
        defaultTask.actions.addAll(Lists.newArrayList(closureAction))
        execute(defaultTask)

        assertTrue(actionExecuted)
    }

    @Issue("GRADLE-2774")
    @Test
    public void testAddAllActionToActionsWithIndexAndExecute() {
        def actionExecuted = false
        def closureAction = { t -> actionExecuted = true } as Action
        defaultTask.actions.addAll(0, Lists.newArrayList(closureAction))
        execute(defaultTask)
        assertTrue(actionExecuted)
    }

    @Issue("GRADLE-2774")
    @Test
    public void testAddActionToActionsWithIteratorAndExecute() {
        def actionExecuted = false
        def closureAction = { t -> actionExecuted = true } as Action
        defaultTask.actions.listIterator().add(closureAction)
        execute(defaultTask)
        assertTrue(actionExecuted)
    }

    @Test
    public void testAddedActionCanBeRemoved() {
        def closureAction = { t -> } as Action

        defaultTask.actions.add(closureAction)
        defaultTask.actions.remove(closureAction)
        assertTrue(defaultTask.actions.isEmpty())

        defaultTask.actions.add(closureAction)
        defaultTask.actions.removeAll([closureAction])
        assertTrue(defaultTask.actions.isEmpty())
    }


    @Rule
    public ExpectedException thrown = ExpectedException.none()

    @Test
    public void testAddNullToActionsAndExecute() {
        thrown.expect(InvalidUserDataException.class)
        defaultTask.actions.add(null);
    }

    @Test
    public void testAddNullToActionsWithIndexAndExecute() {
        thrown.expect(InvalidUserDataException.class)
        defaultTask.actions.add(0, null);
    }

    @Test
    public void testAddAllNullToActionsAndExecute() {
        thrown.expect(InvalidUserDataException.class)
        defaultTask.actions.addAll(null);
    }

    @Test
    public void testAddAllNullToActionsWithIndexAndExecute() {
        thrown.expect(InvalidUserDataException.class)
        defaultTask.actions.addAll(0, null);
    }

    @Test
    public void testExecuteThrowsExecutionFailure() {
        def failure = new RuntimeException()
        defaultTask.doFirst { throw failure }

        try {
            defaultTask.execute()
            fail()
        } catch (TaskExecutionException e) {
            assertThat(e.cause, sameInstance(failure))
        }

        assertThat(defaultTask.state.failure, instanceOf(TaskExecutionException))
        assertThat(defaultTask.state.failure.cause, sameInstance(failure))
    }

    @Test
    void getAndSetConventionProperties() {
        TestConvention convention = new TestConvention()
        defaultTask.convention.plugins.test = convention
        assertTrue(defaultTask.hasProperty('conventionProperty'))
        defaultTask.conventionProperty = 'value'
        assertEquals(defaultTask.conventionProperty, 'value')
        assertEquals(convention.conventionProperty, 'value')
    }

    @Test
    void canCallConventionMethods() {
        defaultTask.convention.plugins.test = new TestConvention()
        assertEquals(defaultTask.conventionMethod('a', 'b').toString(), "a.b")
    }

    @Test(expected = MissingPropertyException)
    void accessNonExistingProperty() {
        defaultTask."unknownProp"
    }

    @Test
    void canGetTemporaryDirectory() {
        File tmpDir = new File(project.buildDir, "tmp/testTask")
        assertFalse(tmpDir.exists())

        assertThat(defaultTask.temporaryDir, equalTo(tmpDir))
        assertTrue(tmpDir.isDirectory())
    }

    @Test
    void canAccessServices() {
        assertNotNull(defaultTask.services.get(ListenerManager))
    }

    @Test
    public void testDependentTaskDidWork() {
        final Task task1 = context.mock(Task.class, "task1");
        final Task task2 = context.mock(Task.class, "task2");
        final TaskDependency dependencyMock = context.mock(TaskDependency.class);
        getTask().dependsOn(dependencyMock);
        context.checking(new Expectations() {
            {
                allowing(dependencyMock).getDependencies(getTask());
                will(returnValue(WrapUtil.toSet(task1, task2)));

                exactly(2).of(task1).getDidWork();
                will(returnValue(false));

                exactly(2).of(task2).getDidWork();
                will(onConsecutiveCalls(returnValue(false), returnValue(true)));
            }
        });

        assertFalse(getTask().dependsOnTaskDidWork());

        assertTrue(getTask().dependsOnTaskDidWork());
    }

    @Test
    @Issue("https://issues.gradle.org/browse/GRADLE-2022")
    public void testGoodErrorMessageWhenTaskInstantiatedDirectly() {
        try {
            new DefaultTask();
            fail();
        } catch (TaskInstantiationException e) {
            assertThat(e.getMessage(), containsString("has been instantiated directly which is not supported"));
        }
    }
}

class TestConvention {
    def conventionProperty

    def conventionMethod(a, b) {
        "$a.$b"
    }
}
