/**
 * Copyright (C) 2010 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 java.io.IOException;

import junit.framework.TestCase;

import com.google.inject.internal.Errors;
import com.google.inject.name.Named;
import com.google.inject.name.Names;

/**
 * Tests that ProvisionExceptions are readable and clearly indicate to the user what went wrong with
 * their code.
 *
 * @author sameb@google.com (Sam Berlin)
 */
public class ProvisionExceptionsTest extends TestCase {
  
  public void testConstructorRuntimeException() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bindConstant().annotatedWith(Names.named("runtime")).to(true);
        bind(Exploder.class).to(Explosion.class);
        bind(Tracer.class).to(TracerImpl.class);        
      }
    });
    try {
      injector.getInstance(Tracer.class);
      fail();
    } catch(ProvisionException pe) {
      // Make sure our initial error message gives the user exception.
      Asserts.assertContains(pe.getMessage(),
          "1) Error injecting constructor", "java.lang.IllegalStateException: boom!");
      assertEquals(1, pe.getErrorMessages().size());
      assertEquals(IllegalStateException.class, pe.getCause().getClass());
      assertEquals(IllegalStateException.class, Errors.getOnlyCause(pe.getErrorMessages()).getClass());
    }
  }
  
  public void testConstructorCheckedException() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bindConstant().annotatedWith(Names.named("runtime")).to(false);
        bind(Exploder.class).to(Explosion.class);
        bind(Tracer.class).to(TracerImpl.class);        
      }
    });
    try {
      injector.getInstance(Tracer.class);
      fail();
    } catch(ProvisionException pe) {
      // Make sure our initial error message gives the user exception.
      Asserts.assertContains(pe.getMessage(),
          "1) Error injecting constructor", "java.io.IOException: boom!");
      assertEquals(1, pe.getErrorMessages().size());
      assertEquals(IOException.class, pe.getCause().getClass());
      assertEquals(IOException.class, Errors.getOnlyCause(pe.getErrorMessages()).getClass());
    }
  }
  
  public void testCustomProvidersRuntimeException() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Exploder.class).toProvider(new Provider<Exploder>() {
          public Exploder get() {
            return Explosion.createRuntime();
          }
        });
        bind(Tracer.class).to(TracerImpl.class);        
      }
    });
    try {
      injector.getInstance(Tracer.class);
      fail();
    } catch(ProvisionException pe) {
      // Make sure our initial error message gives the user exception.
      Asserts.assertContains(pe.getMessage(),
          "1) Error in custom provider", "java.lang.IllegalStateException: boom!");
      assertEquals(1, pe.getErrorMessages().size());
      assertEquals(IllegalStateException.class, pe.getCause().getClass());
      assertEquals(IllegalStateException.class, Errors.getOnlyCause(pe.getErrorMessages()).getClass());
    }
  }
  
  public void testProviderMethodRuntimeException() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Tracer.class).to(TracerImpl.class);        
      }
      @Provides Exploder exploder() {
        return Explosion.createRuntime();
      }
    });
    try {
      injector.getInstance(Tracer.class);
      fail();
    } catch(ProvisionException pe) {
      // Make sure our initial error message gives the user exception.
      Asserts.assertContains(pe.getMessage(),
          "1) Error in custom provider", "java.lang.IllegalStateException: boom!");
      assertEquals(1, pe.getErrorMessages().size());
      assertEquals(IllegalStateException.class, pe.getCause().getClass());
      assertEquals(IllegalStateException.class, Errors.getOnlyCause(pe.getErrorMessages()).getClass());
    }
  }
  
  public void testProviderMethodCheckedException() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Tracer.class).to(TracerImpl.class);        
      }
      @Provides Exploder exploder() throws IOException {
        return Explosion.createChecked();
      }
    });
    try {
      injector.getInstance(Tracer.class);
      fail();
    } catch(ProvisionException pe) {
      pe.printStackTrace();
      // Make sure our initial error message gives the user exception.
      Asserts.assertContains(pe.getMessage(),
          "1) Error in custom provider", "java.io.IOException: boom!");
      assertEquals(1, pe.getErrorMessages().size());
      assertEquals(IOException.class, pe.getCause().getClass());
      assertEquals(IOException.class, Errors.getOnlyCause(pe.getErrorMessages()).getClass());
    }
  }
  
  private static interface Exploder {}
  public static class Explosion implements Exploder {
    @Inject public Explosion(@Named("runtime") boolean runtime) throws IOException {
      if(runtime) {
        throw new IllegalStateException("boom!");
      } else {
        throw new IOException("boom!");
      }
    }
    
    public static Explosion createRuntime() {
      try {
        return new Explosion(true);
      } catch(IOException iox) {
        throw new RuntimeException();
      }      
    }
    
    public static Explosion createChecked() throws IOException {
      return new Explosion(false);
    }
  }
  private static interface Tracer {}
  private static class TracerImpl implements Tracer {
    @Inject TracerImpl(Exploder explosion) {
    }
  }
}