/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.procedure.impl;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.neo4j.configuration.GraphDatabaseSettings.procedure_allowlist;
import static org.neo4j.internal.helpers.collection.Iterators.asList;
import static org.neo4j.internal.kernel.api.procs.ProcedureSignature.procedureSignature;
import static org.neo4j.kernel.api.ResourceTracker.EMPTY_RESOURCE_TRACKER;
import static org.neo4j.kernel.api.procedure.BasicContext.buildContext;
import static org.neo4j.values.storable.Values.longValue;
import static org.neo4j.values.storable.Values.stringValue;

import java.util.List;
import java.util.stream.Stream;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.neo4j.collection.Dependencies;
import org.neo4j.collection.RawIterator;
import org.neo4j.common.DependencyResolver;
import org.neo4j.configuration.Config;
import org.neo4j.exceptions.KernelException;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.internal.kernel.api.exceptions.ProcedureException;
import org.neo4j.internal.kernel.api.procs.Neo4jTypes;
import org.neo4j.kernel.api.procedure.CallableProcedure;
import org.neo4j.kernel.impl.coreapi.InternalTransaction;
import org.neo4j.kernel.impl.util.DefaultValueMapper;
import org.neo4j.logging.InternalLog;
import org.neo4j.logging.NullLog;
import org.neo4j.procedure.Context;
import org.neo4j.procedure.Name;
import org.neo4j.procedure.Procedure;
import org.neo4j.values.AnyValue;
import org.neo4j.values.ValueMapper;
import org.neo4j.values.storable.BooleanValue;
import org.neo4j.values.storable.LongValue;
import org.neo4j.values.storable.TextValue;
import org.neo4j.values.storable.Values;

@SuppressWarnings({"WeakerAccess", "unused"})
public class ProcedureTest {
    private ProcedureCompiler procedureCompiler;
    private ComponentRegistry components;
    private final DependencyResolver dependencyResolver = new Dependencies();
    private final ValueMapper<Object> valueMapper = new DefaultValueMapper(mock(InternalTransaction.class));

    @BeforeEach
    void setUp() {
        components = new ComponentRegistry();
        procedureCompiler = new ProcedureCompiler(
                new TypeCheckers(), components, components, NullLog.getInstance(), ProcedureConfig.DEFAULT);
    }

    @Test
    void shouldInjectLogging() throws KernelException {
        // Given
        InternalLog log = spy(InternalLog.class);
        components.register(InternalLog.class, ctx -> log);
        CallableProcedure procedure =
                procedureCompiler.compileProcedure(LoggingProcedure.class, true).get(0);

        // When
        procedure.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);

        // Then
        verify(log).debug("1");
        verify(log).info("2");
        verify(log).warn("3");
        verify(log).error("4");
    }

    @Test
    void shouldCompileProcedure() throws Throwable {
        // When
        List<CallableProcedure> procedures = compile(SingleReadOnlyProcedure.class);

        // Then
        assertEquals(1, procedures.size());
        assertThat(procedures.get(0).signature())
                .isEqualTo(procedureSignature("org", "neo4j", "procedure", "impl", "listCoolPeople")
                        .out("name", Neo4jTypes.NTString)
                        .build());
    }

    @Test
    void shouldRunSimpleReadOnlyProcedure() throws Throwable {
        // Given
        CallableProcedure proc = compile(SingleReadOnlyProcedure.class).get(0);

        // When
        RawIterator<AnyValue[], ProcedureException> out =
                proc.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);

        // Then
        assertThat(asList(out))
                .containsExactly(new AnyValue[] {stringValue("Bonnie")}, new AnyValue[] {stringValue("Clyde")});
    }

    @Test
    void shouldIgnoreClassesWithNoProcedures() throws Throwable {
        // When
        List<CallableProcedure> procedures = compile(PrivateConstructorButNoProcedures.class);

        // Then
        assertEquals(0, procedures.size());
    }

    @Test
    void shouldRunClassWithMultipleProceduresDeclared() throws Throwable {
        // Given
        List<CallableProcedure> compiled = compile(MultiProcedureProcedure.class);
        CallableProcedure bananaPeople = compiled.get(0);
        CallableProcedure coolPeople = compiled.get(1);

        // When
        RawIterator<AnyValue[], ProcedureException> coolOut =
                coolPeople.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);
        RawIterator<AnyValue[], ProcedureException> bananaOut =
                bananaPeople.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);

        // Then
        assertThat(asList(coolOut))
                .containsExactly(new AnyValue[] {stringValue("Bonnie")}, new AnyValue[] {stringValue("Clyde")});

        assertThat(asList(bananaOut))
                .containsExactly(
                        new AnyValue[] {stringValue("Jake"), longValue(18L)},
                        new AnyValue[] {stringValue("Pontus"), longValue(2L)});
    }

    @Test
    void shouldGiveHelpfulErrorOnConstructorThatRequiresArgument() {
        ProcedureException exception =
                assertThrows(ProcedureException.class, () -> compile(WeirdConstructorProcedure.class));
        assertThat(exception.getMessage())
                .isEqualTo(
                        "Unable to find a usable public no-argument constructor in the class `WeirdConstructorProcedure`. Please add a "
                                + "valid, public constructor, recompile the class and try again.");
    }

    @Test
    void shouldGiveHelpfulErrorOnNoPublicConstructor() {
        ProcedureException exception =
                assertThrows(ProcedureException.class, () -> compile(PrivateConstructorProcedure.class));
        assertThat(exception.getMessage())
                .isEqualTo(
                        "Unable to find a usable public no-argument constructor in the class `PrivateConstructorProcedure`. Please add "
                                + "a valid, public constructor, recompile the class and try again.");
    }

    @Test
    void shouldAllowVoidOutput() throws Throwable {
        // When
        CallableProcedure proc = compile(ProcedureWithVoidOutput.class).get(0);

        // Then
        assertEquals(0, proc.signature().outputSignature().size());
        assertFalse(proc.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER)
                .hasNext());
    }

    @Test
    void shouldGiveHelpfulErrorOnProcedureReturningInvalidRecordType() {
        ProcedureException exception =
                assertThrows(ProcedureException.class, () -> compile(ProcedureWithInvalidRecordOutput.class));
        assertThat(exception.getMessage())
                .isEqualTo(
                        String.format("Procedures must return a Stream of records, where a record is a concrete class%n"
                                + "that you define, with public non-final fields defining the fields in the record.%n"
                                + "If you''d like your procedure to return `String`, you could define a record class like:%n"
                                + "public class Output '{'%n"
                                + "    public String out;%n"
                                + "'}'%n%n"
                                + "And then define your procedure as returning `Stream<Output>`."));
    }

    @Test
    void shouldGiveHelpfulErrorOnContextAnnotatedStaticField() {
        ProcedureException exception =
                assertThrows(ProcedureException.class, () -> compile(ProcedureWithStaticContextAnnotatedField.class));
        assertThat(exception.getMessage())
                .isEqualTo(String.format(
                        "The field `gdb` in the class named `ProcedureWithStaticContextAnnotatedField` is annotated as a @Context field,%n"
                                + "but it is static. @Context fields must be public, non-final and non-static,%n"
                                + "because they are reset each time a procedure is invoked."));
    }

    @Test
    void shouldAllowNonStaticOutput() throws Throwable {
        // When
        CallableProcedure proc =
                compile(ProcedureWithNonStaticOutputRecord.class).get(0);

        // Then
        assertEquals(1, proc.signature().outputSignature().size());
    }

    @Test
    void shouldAllowOverridingProcedureName() throws Throwable {
        // When
        CallableProcedure proc = compile(ProcedureWithOverriddenName.class).get(0);

        // Then
        assertEquals(
                "org.mystuff.thisisActuallyTheName", proc.signature().name().toString());
    }

    @Test
    void shouldAllowOverridingProcedureNameWithoutNamespace() throws Throwable {
        // When
        CallableProcedure proc = compile(ProcedureWithSingleName.class).get(0);

        // Then
        assertEquals("singleName", proc.signature().name().toString());
    }

    @Test
    void shouldGiveHelpfulErrorOnNullMessageException() throws Throwable {
        // Given
        CallableProcedure proc =
                compile(ProcedureThatThrowsNullMsgExceptionAtInvocation.class).get(0);

        ProcedureException exception = assertThrows(
                ProcedureException.class, () -> proc.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER));
        assertThat(exception.getMessage())
                .isEqualTo(
                        "Failed to invoke procedure `org.neo4j.procedure.impl.throwsAtInvocation`: Caused by: java.lang.IndexOutOfBoundsException");
    }

    @Test
    void shouldCloseResourcesAndGiveHelpfulErrorOnMidStreamException() throws Throwable {
        // Given
        CallableProcedure proc =
                compile(ProcedureThatThrowsNullMsgExceptionMidStream.class).get(0);

        ProcedureException exception = assertThrows(ProcedureException.class, () -> {
            RawIterator<AnyValue[], ProcedureException> stream =
                    proc.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);
            if (stream.hasNext()) {
                stream.next();
            }
        });
        assertThat(exception.getMessage())
                .isEqualTo(
                        "Failed to invoke procedure `org.neo4j.procedure.impl.throwsInStream`: Caused by: java.lang.IndexOutOfBoundsException");
        // Expect that we get a suppressed exception from Stream.onClose (which also verifies that we actually call
        // onClose on the first exception)
        assertThat(exception.getSuppressed()[0]).hasRootCauseInstanceOf(ExceptionDuringClose.class);
    }

    @Test
    void shouldSupportProcedureDeprecation() throws Throwable {
        // Given
        InternalLog log = mock(InternalLog.class);
        ProcedureCompiler procedureCompiler =
                new ProcedureCompiler(new TypeCheckers(), components, components, log, ProcedureConfig.DEFAULT);

        // When
        List<CallableProcedure> procs = procedureCompiler.compileProcedure(ProcedureWithDeprecation.class, true);

        // Then
        verify(log).warn("Use of @Procedure(deprecatedBy) without @Deprecated in badProc");
        verifyNoMoreInteractions(log);
        for (CallableProcedure proc : procs) {
            String name = proc.signature().name().name();
            proc.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);
            switch (name) {
                case "newProc":
                    assertFalse(proc.signature().deprecated().isPresent(), "Should not be deprecated");
                    break;
                case "oldProc":
                case "badProc":
                    assertTrue(proc.signature().deprecated().isPresent(), "Should be deprecated");
                    assertThat(proc.signature().deprecated().get()).isEqualTo("newProc");
                    break;
                default:
                    fail("Unexpected procedure: " + name);
            }
        }
    }

    @Test
    void shouldLoadWhiteListedProcedure() throws Throwable {
        // Given
        ProcedureConfig config = new ProcedureConfig(
                Config.defaults(procedure_allowlist, List.of("org.neo4j.procedure.impl.listCoolPeople")));

        InternalLog log = mock(InternalLog.class);
        ProcedureCompiler procedureCompiler =
                new ProcedureCompiler(new TypeCheckers(), components, components, log, config);

        // When
        CallableProcedure proc = procedureCompiler
                .compileProcedure(SingleReadOnlyProcedure.class, false)
                .get(0);
        // When
        RawIterator<AnyValue[], ProcedureException> result =
                proc.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);

        // Then
        assertEquals(result.next()[0], stringValue("Bonnie"));
    }

    @Test
    void shouldNotLoadNoneWhiteListedProcedure() throws Throwable {
        // Given
        ProcedureConfig config = new ProcedureConfig(
                Config.defaults(procedure_allowlist, List.of("org.neo4j.procedure.impl.NOTlistCoolPeople")));

        InternalLog log = mock(InternalLog.class);
        ProcedureCompiler procedureCompiler =
                new ProcedureCompiler(new TypeCheckers(), components, components, log, config);

        // When
        List<CallableProcedure> proc = procedureCompiler.compileProcedure(SingleReadOnlyProcedure.class, false);
        // Then
        verify(log)
                .warn(
                        "The procedure 'org.neo4j.procedure.impl.listCoolPeople' is not on the allowlist and won't be loaded.");
        assertThat(proc.isEmpty()).isTrue();
    }

    @Test
    void shouldIgnoreWhiteListingIfFullAccess() throws Throwable {
        // Given
        ProcedureConfig config = new ProcedureConfig(Config.defaults(procedure_allowlist, List.of("empty")));
        InternalLog log = mock(InternalLog.class);
        ProcedureCompiler procedureCompiler =
                new ProcedureCompiler(new TypeCheckers(), components, components, log, config);

        // When
        CallableProcedure proc = procedureCompiler
                .compileProcedure(SingleReadOnlyProcedure.class, true)
                .get(0);
        // Then
        RawIterator<AnyValue[], ProcedureException> result =
                proc.apply(prepareContext(), new AnyValue[0], EMPTY_RESOURCE_TRACKER);
        assertEquals(result.next()[0], stringValue("Bonnie"));
    }

    @Test
    void shouldNotLoadAnyProcedureIfConfigIsEmpty() throws Throwable {
        // Given
        ProcedureConfig config = new ProcedureConfig(Config.defaults(procedure_allowlist, List.of("")));
        InternalLog log = mock(InternalLog.class);
        ProcedureCompiler procedureCompiler =
                new ProcedureCompiler(new TypeCheckers(), components, components, log, config);

        // When
        List<CallableProcedure> proc = procedureCompiler.compileProcedure(SingleReadOnlyProcedure.class, false);
        // Then
        verify(log)
                .warn(
                        "The procedure 'org.neo4j.procedure.impl.listCoolPeople' is not on the allowlist and won't be loaded.");
        assertThat(proc.isEmpty()).isTrue();
    }

    @Test
    void shouldRunProcedureWithInternalTypes() throws Throwable {
        // Given
        CallableProcedure proc = compile(InternalTypes.class).get(0);

        // When
        RawIterator<AnyValue[], ProcedureException> out = proc.apply(
                prepareContext(),
                new AnyValue[] {longValue(42), stringValue("hello"), Values.TRUE},
                EMPTY_RESOURCE_TRACKER);

        // Then
        assertThat(out.next()).isEqualTo(new AnyValue[] {longValue(42), stringValue("hello"), Values.TRUE});
        assertFalse(out.hasNext());
    }

    private org.neo4j.kernel.api.procedure.Context prepareContext() {
        return buildContext(dependencyResolver, valueMapper).context();
    }

    public record MyOutputRecord(String name) {}

    public static class SomeOtherOutputPOJO {
        public String name;
        public long bananas;

        public SomeOtherOutputPOJO(String name, long bananas) {
            this.name = name;
            this.bananas = bananas;
        }
    }

    public static class LoggingProcedure {
        @Context
        public InternalLog log;

        @Procedure
        public Stream<MyOutputRecord> logAround() {
            log.debug("1");
            log.info("2");
            log.warn("3");
            log.error("4");
            return Stream.empty();
        }
    }

    public static class SingleReadOnlyProcedure {
        @Procedure
        public Stream<MyOutputRecord> listCoolPeople() {
            return Stream.of(new MyOutputRecord("Bonnie"), new MyOutputRecord("Clyde"));
        }
    }

    public static class ProcedureWithVoidOutput {
        @Procedure
        public void voidOutput() {}
    }

    public static class ProcedureWithNonStaticOutputRecord {
        @Procedure
        public Stream<NonStatic> voidOutput() {
            return Stream.of(new NonStatic());
        }

        public class NonStatic {
            public String field = "hello, rodl!";
        }
    }

    public static class MultiProcedureProcedure {
        @Procedure
        public Stream<MyOutputRecord> listCoolPeople() {
            return Stream.of(new MyOutputRecord("Bonnie"), new MyOutputRecord("Clyde"));
        }

        @Procedure
        public Stream<SomeOtherOutputPOJO> listBananaOwningPeople() {
            return Stream.of(new SomeOtherOutputPOJO("Jake", 18), new SomeOtherOutputPOJO("Pontus", 2));
        }
    }

    public static class WeirdConstructorProcedure {
        public WeirdConstructorProcedure(WeirdConstructorProcedure wat) {}

        @Procedure
        public Stream<MyOutputRecord> listCoolPeople() {
            return Stream.of(new MyOutputRecord("Bonnie"), new MyOutputRecord("Clyde"));
        }
    }

    public static class ProcedureWithInvalidRecordOutput {
        @Procedure
        public String test() {
            return "Testing";
        }
    }

    public static class ProcedureWithStaticContextAnnotatedField {
        @Context
        public static GraphDatabaseService gdb;

        @Procedure
        public Stream<MyOutputRecord> test() {
            return null;
        }
    }

    public static class ProcedureThatThrowsNullMsgExceptionAtInvocation {
        @Procedure
        public Stream<MyOutputRecord> throwsAtInvocation() {
            throw new IndexOutOfBoundsException();
        }
    }

    public static class ProcedureThatThrowsNullMsgExceptionMidStream {
        @Procedure
        public Stream<MyOutputRecord> throwsInStream() {
            return Stream.<MyOutputRecord>generate(() -> {
                        throw new IndexOutOfBoundsException();
                    })
                    .onClose(() -> {
                        throw new ExceptionDuringClose();
                    });
        }
    }

    public static class PrivateConstructorProcedure {
        private PrivateConstructorProcedure() {}

        @Procedure
        public Stream<MyOutputRecord> listCoolPeople() {
            return Stream.of(new MyOutputRecord("Bonnie"), new MyOutputRecord("Clyde"));
        }
    }

    public static class PrivateConstructorButNoProcedures {
        private PrivateConstructorButNoProcedures() {}

        public Stream<MyOutputRecord> thisIsNotAProcedure() {
            return null;
        }
    }

    public static class ProcedureWithOverriddenName {
        @Procedure("org.mystuff.thisisActuallyTheName")
        public void somethingThatShouldntMatter() {}

        @Procedure("singleName")
        public void blahDoesntMatterEither() {}
    }

    public static class ProcedureWithSingleName {
        @Procedure("singleName")
        public void blahDoesntMatterEither() {}
    }

    public static class ProcedureWithDeprecation {
        @Procedure("newProc")
        public void newProc() {}

        @Deprecated
        @Procedure(value = "oldProc", deprecatedBy = "newProc")
        public void oldProc() {}

        @Procedure(value = "badProc", deprecatedBy = "newProc")
        public void badProc() {}
    }

    public static class InternalTypes {
        @Procedure
        public Stream<InternalTypeRecord> internalTypes(
                @Name(value = "long") LongValue longValue,
                @Name(value = "text") TextValue textValue,
                @Name(value = "bool") BooleanValue booleanValue) {
            return Stream.of(new InternalTypeRecord(longValue, textValue, booleanValue));
        }
    }

    public record InternalTypeRecord(LongValue longValue, TextValue textValue, BooleanValue booleanValue) {}

    private List<CallableProcedure> compile(Class<?> clazz) throws KernelException {
        return procedureCompiler.compileProcedure(clazz, true);
    }

    private static class ExceptionDuringClose extends RuntimeException {}
}
