/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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 com.google.inject;

import static com.google.inject.Asserts.assertContains;
import static com.google.inject.Asserts.getDeclaringSourcePart;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import com.google.inject.matcher.Matchers;
import com.google.inject.spi.TypeEncounter;
import com.google.inject.spi.TypeListener;

import junit.framework.TestCase;

import java.lang.annotation.Retention;

/**
 * @author crazybob@google.com (Bob Lee)
 */
public class RequestInjectionTest extends TestCase {

  @Retention(RUNTIME)
  @BindingAnnotation @interface ForField {}

  @Retention(RUNTIME)
  @BindingAnnotation @interface ForMethod {}

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    HasInjections.staticField = 0;
    HasInjections.staticMethod = null;
  }

  public void testInjectMembers() {
    final HasInjections hi = new HasInjections();

    Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bindConstant().annotatedWith(ForMethod.class).to("test");
        bindConstant().annotatedWith(ForField.class).to(5);
        requestInjection(hi);
      }
    });

    assertEquals("test", hi.instanceMethod);
    assertEquals(5, hi.instanceField);
    assertNull(HasInjections.staticMethod);
    assertEquals(0, HasInjections.staticField);
  }

  public void testInjectStatics() throws CreationException {
    Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bindConstant().annotatedWith(ForMethod.class).to("test");
        bindConstant().annotatedWith(ForField.class).to(5);
        requestStaticInjection(HasInjections.class);
      }
    });

    assertEquals("test", HasInjections.staticMethod);
    assertEquals(5, HasInjections.staticField);
  }
  
  public void testInjectMembersAndStatics() {
    final HasInjections hi = new HasInjections();

    Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bindConstant().annotatedWith(ForMethod.class).to("test");
        bindConstant().annotatedWith(ForField.class).to(5);
        requestStaticInjection(HasInjections.class);
        requestInjection(hi);
      }
    });

    assertEquals("test", hi.instanceMethod);
    assertEquals(5, hi.instanceField);
    assertEquals("test", HasInjections.staticMethod);
    assertEquals(5, HasInjections.staticField);
  }

  public void testValidationErrorOnInjectedMembers() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          requestInjection(new NeedsRunnable());
        }
      });
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) No implementation for java.lang.Runnable was bound",
          "at " + NeedsRunnable.class.getName(), ".runnable(RequestInjectionTest.java:");
    }
  }

  public void testInjectionErrorOnInjectedMembers() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(Runnable.class).toProvider(new Provider<Runnable>() {
            public Runnable get() {
              throw new UnsupportedOperationException();
            }
          });
          requestInjection(new NeedsRunnable());
        }
      });
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Error in custom provider, java.lang.UnsupportedOperationException",
          "for field at " + NeedsRunnable.class.getName() + ".runnable(RequestInjectionTest.java:",
          "at " + getClass().getName(), getDeclaringSourcePart(getClass()));
    }
  }

  public void testUserExceptionWhileInjectingInstance() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          requestInjection(new BlowsUpOnInject());
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Error injecting method, java.lang.UnsupportedOperationException: Pop",
          "at " + BlowsUpOnInject.class.getName() + ".injectInstance(RequestInjectionTest.java:");
    }
  }

  public void testUserExceptionWhileInjectingStatically() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          requestStaticInjection(BlowsUpOnInject.class);
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Error injecting method, java.lang.UnsupportedOperationException: Snap",
          "at " + BlowsUpOnInject.class.getName() + ".injectStatically(RequestInjectionTest.java:");
    }
  }

  static class NeedsRunnable {
    @Inject Runnable runnable;
  }

  static class HasInjections {

    @Inject @ForField static int staticField;
    @Inject @ForField int instanceField;

    static String staticMethod;
    String instanceMethod;

    @Inject static void setStaticMethod(@ForMethod String staticMethod) {
      HasInjections.staticMethod = staticMethod;
    }

    @Inject void setInstanceS(@ForMethod String instanceS) {
      this.instanceMethod = instanceS;
    }
  }

  static class BlowsUpOnInject {
    @Inject void injectInstance() {
      throw new UnsupportedOperationException("Pop");
    }

    @Inject static void injectStatically() {
      throw new UnsupportedOperationException("Snap");
    }
  }
  
  /*
   * Tests that initializables of the same instance don't clobber
   * membersInjectors in InitializableReference, so that they ultimately
   * can be requested in any order.
   */
  public void testEarlyInjectableReferencesWithSameIdentity() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        // Add a listener to trigger all toInstance bindings to get an Initializable.
        bindListener(Matchers.any(), new TypeListener() {
          @Override
          public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
          }
        });
        
        // Bind two different Keys to the IDENTITICAL object
        // ORDER MATTERS! We want the String binding to push out the Object one
        String fail = new String("better not fail!");
        bind(Object.class).toInstance(fail);
        bind(String.class).toInstance(fail);
        
        // Then try to inject those objects in a requestInjection,
        // letting us get into InjectableReference.get before it has
        // finished running through all its injections.
        // Each of these technically has its own InjectableReference internally.
        // ORDER MATTERS!.. because Object is injected first, that InjectableReference
        // attempts to process its members injector, but it wasn't initialized,
        // because String pushed it out of the queue!
        requestInjection(new Object() {
          @SuppressWarnings("unused") @Inject Object obj;
          @SuppressWarnings("unused") @Inject String str;
        });
      }
    });
  }
}