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package org.glassfish.jersey.internal.inject;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;

import org.glassfish.jersey.internal.util.collection.Ref;

import org.glassfish.hk2.api.PerLookup;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.api.TypeLiteral;
import org.glassfish.hk2.utilities.binding.AbstractBinder;

import org.jvnet.hk2.annotations.Optional;

import org.junit.Test;

import static org.junit.Assert.assertSame;

/**
 * Referencing factory test.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public class ReferencingFactoryTest extends AbstractBinder {

    private static class Foo {
        final int value;

        private Foo(int value) {
            this.value = value;
        }
    }

    private static class ValueInjected {

        @Inject
        @Optional
        Foo foo;
        @Inject
        @Optional
        List<Integer> integers;
        @Inject
        List<String> strings;
    }

    private static class RefInjected {

        @Inject
        Ref<Foo> foo;
        @Inject
        Ref<List<Integer>> integers;
        @Inject
        Ref<List<String>> strings;
    }

    //
    private Foo expectedFoo = null;
    private List<Integer> expectedIntegers = null;
    private List<String> expectedStrings = new LinkedList<String>();

    private static final class FooReferencingFactory extends ReferencingFactory<Foo> {
        @Inject
        public FooReferencingFactory(Provider<Ref<Foo>> referenceFactory) {
            super(referenceFactory);
        }
    }

    private static final class ListOfIntegerReferencingFactory extends ReferencingFactory<List<Integer>> {
        @Inject
        public ListOfIntegerReferencingFactory(Provider<Ref<List<Integer>>> referenceFactory) {
            super(referenceFactory);
        }
    }

    private static final class ListOfStringReferencingFactory extends ReferencingFactory<List<String>> {
        @Inject
        public ListOfStringReferencingFactory(Provider<Ref<List<String>>> referenceFactory) {
            super(referenceFactory);
        }
    }

    @Override
    protected void configure() {
        bindFactory(FooReferencingFactory.class).to(Foo.class).in(PerLookup.class);
        bindFactory(ReferencingFactory.<Foo>referenceFactory()).to(new TypeLiteral<Ref<Foo>>() {}).in(Singleton.class);

        bindFactory(ListOfIntegerReferencingFactory.class).to(new TypeLiteral<List<Integer>>() {}).in(PerLookup.class);
        bindFactory(ReferencingFactory.<List<Integer>>referenceFactory()).to(new TypeLiteral<Ref<List<Integer>>>() {
        }).in(Singleton.class);

        bindFactory(ListOfStringReferencingFactory.class).to(new TypeLiteral<List<String>>() {}).in(PerLookup.class);
        bindFactory(ReferencingFactory.<List<String>>referenceFactory(expectedStrings)).to(new TypeLiteral<Ref<List<String>>>() {
        }).in(Singleton.class);
    }

    /**
     * Referenced binding test.
     */
    @Test
    public void testReferencedBinding() {
        ServiceLocator locator = Injections.createLocator(this);

        ValueInjected emptyValues = locator.createAndInitialize(ValueInjected.class);
        assertSame(expectedFoo, emptyValues.foo);
        assertSame(expectedIntegers, emptyValues.integers);
        assertSame(expectedStrings, emptyValues.strings);

        RefInjected refValues = locator.createAndInitialize(RefInjected.class);
        expectedFoo = new Foo(10);
        refValues.foo.set(expectedFoo);
        expectedIntegers = new LinkedList<Integer>();
        refValues.integers.set(expectedIntegers);
        expectedStrings = new ArrayList<String>();
        refValues.strings.set(expectedStrings);

        ValueInjected updatedValues = locator.createAndInitialize(ValueInjected.class);
        assertSame(expectedFoo, updatedValues.foo);
        assertSame(expectedIntegers, updatedValues.integers);
        assertSame(expectedStrings, updatedValues.strings);
    }
}
