/*
 * Copyright 2013 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.integtests

import groovy.transform.NotYetImplemented
import org.gradle.api.CircularReferenceException
import org.gradle.integtests.fixtures.AbstractIntegrationSpec
import spock.lang.Issue
import spock.lang.Unroll

import static org.gradle.integtests.fixtures.executer.TaskOrderSpecs.any
import static org.gradle.integtests.fixtures.executer.TaskOrderSpecs.exact
import static org.hamcrest.CoreMatchers.startsWith

@Unroll
class TaskExecutionIntegrationTest extends AbstractIntegrationSpec {

    def taskCanAccessTaskGraph() {
        buildFile << """
    boolean notified = false
    task a(dependsOn: 'b') {
        doLast { task ->
            assert notified
            assert gradle.taskGraph.hasTask(task)
            assert gradle.taskGraph.hasTask(':a')
            assert gradle.taskGraph.hasTask(a)
            assert gradle.taskGraph.hasTask(':b')
            assert gradle.taskGraph.hasTask(b)
            assert gradle.taskGraph.allTasks.contains(task)
            assert gradle.taskGraph.allTasks.contains(tasks.getByName('b'))
        }
    }
    task b
    gradle.taskGraph.whenReady { graph ->
        assert graph.hasTask(':a')
        assert graph.hasTask(a)
        assert graph.hasTask(':b')
        assert graph.hasTask(b)
        assert graph.allTasks.contains(a)
        assert graph.allTasks.contains(b)
        notified = true
    }
"""
        when:
        succeeds "a"

        then:
        result.assertTasksExecuted(":b", ":a")
    }

    def executesAllTasksInASingleBuildAndEachTaskAtMostOnce() {
        buildFile << """
    gradle.taskGraph.whenReady { assert !project.hasProperty('graphReady'); ext.graphReady = true }
    task a {
        doLast { task ->
            project.ext.executedA = task
        }
    }
    task b {
        doLast {
            assert a == project.executedA
            assert gradle.taskGraph.hasTask(':a')
        }
    }
    task c(dependsOn: a)
    task d(dependsOn: a)
    task e(dependsOn: [a, d]);
"""
        expect:
        run("a", "b").assertTasksExecuted(":a", ":b")
        run("a", "a").assertTasksExecuted(":a")
        run("c", "a").assertTasksExecuted(":a", ":c")
        run("c", "e").assertTasksExecuted(":a", ":c", ":d", ":e")
    }

    def executesMultiProjectsTasksInASingleBuildAndEachTaskAtMostOnce() {
        settingsFile << "include 'child1', 'child2', 'child1-2', 'child1-2-2'"
        buildFile << """
    task a
    allprojects {
        task b
        task c(dependsOn: ['b', ':a'])
    };
"""

        expect:
        run("a", "c").assertTasksExecuted(":a", ":b", ":c", ":child1:b", ":child1:c", ":child1-2:b", ":child1-2:c", ":child1-2-2:b", ":child1-2-2:c", ":child2:b", ":child2:c")
        run("b", ":child2:c").assertTasksExecuted(":b", ":child1:b", ":child1-2:b", ":child1-2-2:b", ":child2:b", ":a", ":child2:c")
    }

    def executesMultiProjectDefaultTasksInASingleBuildAndEachTaskAtMostOnce() {
        settingsFile << "include 'child1', 'child2'"
        buildFile << """
    defaultTasks 'a', 'b'
    task a
    subprojects {
        task a(dependsOn: ':a')
        task b(dependsOn: ':a')
    }
"""

        expect:
        run().assertTasksExecuted(":a", ":child1:a", ":child2:a", ":child1:b", ":child2:b")
    }

    def doesNotExecuteTaskActionsWhenDryRunSpecified() {
        buildFile << """
    task a { doLast { fail() } }
    task b(dependsOn: a) { doLast { fail() } }
    defaultTasks 'b'
"""

        expect:
        // project defaults
        executer.withArguments("-m").run().normalizedOutput.contains(":a SKIPPED\n:b SKIPPED")
        // named tasks
        executer.withArguments("-m").withTasks("b").run().normalizedOutput.contains(":a SKIPPED\n:b SKIPPED")
    }

    def executesTaskActionsInCorrectEnvironment() {
        buildFile << """
    // An action attached to built-in task
    task a { doLast { assert Thread.currentThread().contextClassLoader == getClass().classLoader } }

    // An action defined by a custom task
    task b(type: CustomTask)
    class CustomTask extends DefaultTask {
        @TaskAction def go() {
            assert Thread.currentThread().contextClassLoader == getClass().classLoader
        }
    }

    // An action implementation
    task c
    c.doLast new Action<Task>() {
        void execute(Task t) {
            assert Thread.currentThread().contextClassLoader == getClass().classLoader
        }
    }
"""
        expect:
        succeeds("a", "b", "c")
    }

    def excludesTasksWhenExcludePatternSpecified() {
        settingsFile << "include 'sub'"
        buildFile << """
    task a
    task b(dependsOn: a)
    task c(dependsOn: [a, b])
    task d(dependsOn: c)
    defaultTasks 'd'
"""
        file("sub/build.gradle") << """
    task c
    task d(dependsOn: c)
"""

        expect:
        // Exclude entire branch
        executer.withTasks(":d").withArguments("-x", "c").run().assertTasksExecuted(":d")
        // Exclude direct dependency
        executer.withTasks(":d").withArguments("-x", "b").run().assertTasksExecuted(":a", ":c", ":d")
        // Exclude using paths and multi-project
        executer.withTasks("d").withArguments("-x", "c").run().assertTasksExecuted(":d", ":sub:d")
        executer.withTasks("d").withArguments("-x", "sub:c").run().assertTasksExecuted(":a", ":b", ":c", ":d", ":sub:d")
        executer.withTasks("d").withArguments("-x", ":sub:c").run().assertTasksExecuted(":a", ":b", ":c", ":d", ":sub:d")
        executer.withTasks("d").withArguments("-x", "d").run().assertTasksExecuted()
        // Project defaults
        executer.withArguments("-x", "b").run().assertTasksExecuted(":a", ":c", ":d", ":sub:c", ":sub:d")
        // Unknown task
        executer.withTasks("d").withArguments("-x", "unknown").runWithFailure().assertThatDescription(startsWith("Task 'unknown' not found in root project"))
    }

    def "unqualified exclude task name does not exclude tasks from parent projects"() {
        settingsFile << "include 'sub'"
        buildFile << """
    task a
"""
        file("sub/build.gradle") << """
    task a
    task b
    task c(dependsOn: [a, b, ':a'])
"""

        expect:
        executer.inDirectory(file('sub')).withTasks('c').withArguments('-x', 'a').run().assertTasksExecuted(':a', ':sub:b', ':sub:c')
    }

    def 'can use camel-case matching to exclude tasks'() {
        buildFile << """
task someDep
task someOtherDep
task someTask(dependsOn: [someDep, someOtherDep])
"""

        expect:
        executer.withTasks("someTask").withArguments("-x", "sODep").run().assertTasksExecuted(":someDep", ":someTask")
        executer.withTasks("someTask").withArguments("-x", ":sODep").run().assertTasksExecuted(":someDep", ":someTask")
    }

    def 'can combine exclude task filters'() {
        buildFile << """
task someDep
task someOtherDep
task someTask(dependsOn: [someDep, someOtherDep])
"""

        expect:
        executer.withTasks("someTask").withArguments("-x", "someDep", "-x", "someOtherDep").run().assertTasksExecuted(":someTask")
        executer.withTasks("someTask").withArguments("-x", ":someDep", "-x", ":someOtherDep").run().assertTasksExecuted(":someTask")
        executer.withTasks("someTask").withArguments("-x", "sODep", "-x", "soDep").run().assertTasksExecuted(":someTask")
    }

    @Issue(["https://issues.gradle.org/browse/GRADLE-3031", "https://issues.gradle.org/browse/GRADLE-2974"])
    def 'excluding a task that is a dependency of multiple tasks'() {
        settingsFile << "include 'sub'"
        buildFile << """
    task a
    task b(dependsOn: a)
    task c(dependsOn: a)
    task d(dependsOn: [b, c])
"""
        file("sub/build.gradle") << """
    task a
"""

        expect:
        executer.withTasks("d").withArguments("-x", "a").run().assertTasksExecuted(":b", ":c", ":d")
        executer.withTasks("b", "a").withArguments("-x", ":a").run().assertTasksExecuted(":b", ":sub:a")
    }

    @Issue("https://issues.gradle.org/browse/GRADLE-2022")
    def tryingToInstantiateTaskDirectlyFailsWithGoodErrorMessage() {
        buildFile << """
    new DefaultTask()
"""
        when:
        fails "tasks"

        then:
        failure.assertHasCause("Task of type 'org.gradle.api.DefaultTask' has been instantiated directly which is not supported")
    }

    def "sensible error message for circular task dependency"() {
        buildFile << """
    task a(dependsOn: 'b')
    task b(dependsOn: 'a')
"""
        when:
        fails 'b'

        then:
        failure.assertHasDescription """Circular dependency between the following tasks:
:a
\\--- :b
     \\--- :a (*)

(*) - details omitted (listed previously)"""
    }

    def "honours mustRunAfter task ordering"() {
        buildFile << """
    task a {
        mustRunAfter 'b'
    }
    task b
    task c(dependsOn: ['a', 'b'])
    task d
    c.mustRunAfter d

"""
        when:
        succeeds 'c', 'd'

        then:
        result.assertTasksExecutedInOrder(any(':d', ':b', ':a'), ':c')
    }

    def "finalizer task is executed if a finalized task is executed"() {
        buildFile << """
    task a
    task b {
        doLast {}
        finalizedBy a
    }
"""
        when:
        succeeds 'b'

        then:
        executed(":a")
    }

    def "finalizer task is executed even if the finalised task fails"() {
        buildFile << """
    task a
    task b  {
        doLast { throw new RuntimeException() }
        finalizedBy a
    }
"""
        when:
        fails 'b'

        then:
        executed(":a")
    }

    def "finalizer task is not executed if the finalized task does not run"() {
        buildFile << """
    task a {
        doLast { throw new RuntimeException() }
    }
    task b
    task c {
        doLast {}
        dependsOn a
        finalizedBy b
        onlyIf { false }
    }
"""
        when:
        fails 'c'

        then:
        notExecuted(":b")
    }

    def "sensible error message for circular task dependency due to mustRunAfter"() {
        buildFile << """
    task a {
        mustRunAfter 'b'
    }
    task b(dependsOn: 'a')
"""
        when:
        fails 'b'

        then:
        failure.assertHasDescription """Circular dependency between the following tasks:
:a
\\--- :b
     \\--- :a (*)

(*) - details omitted (listed previously)"""
    }

    def "checked exceptions thrown by tasks are reported correctly"() {
        buildFile << """
            class SomeTask extends DefaultTask {

                @TaskAction
                void explode() {
                    throw new Exception("I am the checked exception")
                }
            }

            task explode(type: SomeTask) {

            }
        """

        when:
        fails "explode"

        then:
        failure.assertHasCause "java.lang.Exception: I am the checked exception"
    }

    def "honours shouldRunAfter task ordering"() {
        buildFile << """
    task a() {
        dependsOn 'b'
    }
    task b() {
        shouldRunAfter 'c'
    }
    task c()
    task d() {
        dependsOn 'c'
    }
"""
        when:
        args("--max-workers=1")
        succeeds 'a', 'd'

        then:
        result.assertTasksExecuted(':c', ':b', ':a', ':d')
    }

    def "multiple should run after ordering can be ignored for one execution plan"() {
        buildFile << """
    task a() {
        dependsOn 'b', 'h'
    }
    task b() {
        dependsOn 'c'
    }
    task c() {
        dependsOn 'g'
        shouldRunAfter 'd'
    }
    task d() {
        finalizedBy 'e'
        dependsOn 'f'
    }
    task e()
    task f() {
        dependsOn 'c'
    }
    task g() {
        shouldRunAfter 'h'
    }
    task h() {
        dependsOn 'b'
    }
"""

        when:
        args("--max-workers=1")
        succeeds 'a', 'd'

        then:
        result.assertTasksExecuted(':g', ':c', ':b', ':h', ':a', ':f', ':d', ':e')
    }

    @Issue("GRADLE-3575")
    def "honours task ordering with finalizers on finalizers"() {
        buildFile << """
            task a() {
                dependsOn 'c', 'g'
            }

            task b() {
                dependsOn 'd'
                finalizedBy 'e'
            }

            task c() {
                dependsOn 'd'
            }

            task d() {
                dependsOn 'f'
            }

            task e() {
                finalizedBy 'h'
            }

            task f() {
                finalizedBy 'h'
            }

            task g() {
                dependsOn 'd'
            }

            task h()
        """

        when:
        succeeds 'a'

        then:
        result.assertTasksExecutedInOrder(
            any(
                exact(':f', ':h'),
                exact(any(':c', ':g'), ':a'),
                exact(':f', ':d', ':c')
            )
        )

        when:
        succeeds 'b'

        then:
        result.assertTasksExecutedInOrder(
            any(
                exact(':f', ':h'),
                exact(':b', ':e'),
                exact(':f', ':d', ':b')
            )
        )

        when:
        succeeds 'a', 'b'

        then:
        result.assertTasksExecutedInOrder(
            any(
                exact(':f', ':h'),
                exact(':b', ':e'),
                exact(':f', ':d', any(':b', ':c')),
                exact(any(':c', ':g'), ':a'),
            )
        )

        when:
        succeeds 'b', 'a'

        then:
        result.assertTasksExecutedInOrder(
            any(
                exact(':f', ':h'),
                exact(':b', ':e'),
                exact(':f', ':d', any(':b', ':c')),
                exact(any(':c', ':g'), ':a'),
            )
        )
    }

    @Issue("gradle/gradle#783")
    def "executes finalizer task as soon as possible after finalized task"() {
        buildFile << """
            project(":a") {
                task jar() {
                  dependsOn "compileJava"
                }
                task compileJava() {
                  dependsOn ":b:jar"
                  finalizedBy "compileFinalizer"
                }
                task compileFinalizer()
            }

            project(":b") {
                task jar()
            }

            task build() {
              dependsOn ":a:jar"
              dependsOn ":b:jar"
            }
        """
        settingsFile << "include 'a', 'b'"

        when:
        succeeds ':build'

        then:
        result.assertTasksExecutedInOrder(':b:jar', ':a:compileJava', ':a:compileFinalizer', ':a:jar', ':build')
    }

    @Issue(["gradle/gradle#769", "gradle/gradle#841"])
    def "execution succeed in presence of long dependency chain"() {
        def count = 9000
        buildFile << """
            task a() {
                finalizedBy 'f'
            }

            task f() {
                dependsOn "d_0"
            }

            def nextIndex
            ${count}.times {
                nextIndex = it + 1
                task "d_\$it"() { task ->
                    dependsOn "d_\$nextIndex"
                }
            }
            task "d_\$nextIndex"()
        """

        when:
        succeeds 'a'

        then:

        result.assertTasksExecutedInOrder(([':a'] + (count..0).collect { ":d_$it" } + [':f']) as String[])
    }

    @NotYetImplemented
    @Issue("gradle/gradle#767")
    def "detect a cycle when a task finalized itself"() {
        buildFile << """
            class NotParallel extends DefaultTask {}

            task a(type: NotParallel) {
                finalizedBy "b"
            }

            task b(type: NotParallel) {
                finalizedBy "b"
            }
        """

        when:
        fails 'a'

        then:
        thrown(CircularReferenceException)
    }

    def "produces a sensible error when a task declares both outputs and destroys"() {
        buildFile << """
            task a {
                outputs.file('foo')
                destroyables.register('bar')
            }
        """
        file('foo') << 'foo'
        file('bar') << 'bar'

        when:
        fails 'a'

        then:
        failure.assertHasDescription('Task :a has both outputs and destroyables defined.  A task can define either outputs or destroyables, but not both.')
    }

    def "produces a sensible error when a task declares both inputs and destroys"() {
        buildFile << """
            task a {
                inputs.file('foo')
                destroyables.register('bar')
            }
        """
        file('foo') << 'foo'
        file('bar') << 'bar'

        when:
        fails 'a'

        then:
        failure.assertHasDescription('Task :a has both inputs and destroyables defined.  A task can define either inputs or destroyables, but not both.')
    }

    def "produces a sensible error when a task declares both local state and destroys"() {
        buildFile << """
            task a {
                localState.register('foo')
                destroyables.register('bar')
            }
        """
        file('foo') << 'foo'
        file('bar') << 'bar'

        when:
        fails 'a'

        then:
        failure.assertHasDescription('Task :a has both local state and destroyables defined.  A task can define either local state or destroyables, but not both.')
    }

    @Issue("https://github.com/gradle/gradle/issues/2401")
    def "re-run task does not query inputs after execution"() {
        buildFile << """
            class CustomTask extends DefaultTask {
                private boolean executed

                @InputDirectory
                @Optional
                File getInputDirectory() {
                    if (!executed) {
                        return null
                    }
                    throw new NullPointerException("Busted")
                }

                @OutputFile File outputFile

                @TaskAction
                void doStuff() {
                    executed = true
                }
            }

            task custom(type: CustomTask) {
                outputFile = file("output.txt")
            }
        """

        expect:
        succeeds "custom", "--rerun-tasks"
    }
}
