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package io.grpc;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import io.grpc.MethodDescriptor;
import io.grpc.MethodDescriptor.MethodType;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for {@link MethodDescriptor}.
 */
@RunWith(JUnit4.class)
public class MethodDescriptorTest {
  @Test
  public void createMethodDescriptor() {
    MethodDescriptor<String, String> descriptor = MethodDescriptor.<String, String>create(
        MethodType.CLIENT_STREAMING, "/package.service/method", new StringMarshaller(),
        new StringMarshaller());
    assertEquals(MethodType.CLIENT_STREAMING, descriptor.getType());
    assertEquals("/package.service/method", descriptor.getFullMethodName());
    assertFalse(descriptor.isIdempotent());
    assertFalse(descriptor.isSafe());
  }

  @Test
  public void idempotent() {
    MethodDescriptor<String,String> descriptor = MethodDescriptor.<String, String>newBuilder()
        .setType(MethodType.SERVER_STREAMING)
        .setFullMethodName("/package.service/method")
        .setRequestMarshaller(new StringMarshaller())
        .setResponseMarshaller(new StringMarshaller())
        .build();

    assertFalse(descriptor.isIdempotent());

    // Create a new desriptor by setting idempotent to true
    MethodDescriptor<String, String> newDescriptor =
        descriptor.toBuilder().setIdempotent(true).build();
    assertTrue(newDescriptor.isIdempotent());
    // All other fields should staty the same
    assertEquals(MethodType.SERVER_STREAMING, newDescriptor.getType());
    assertEquals("/package.service/method", newDescriptor.getFullMethodName());
  }

  @Test
  public void safe() {
    MethodDescriptor<String,String> descriptor = MethodDescriptor.<String, String>newBuilder()
        .setType(MethodType.UNARY)
        .setFullMethodName("/package.service/method")
        .setRequestMarshaller(new StringMarshaller())
        .setResponseMarshaller(new StringMarshaller())
        .build();
    assertFalse(descriptor.isSafe());

    // Create a new desriptor by setting safe to true
    MethodDescriptor<String, String> newDescriptor = descriptor.toBuilder().setSafe(true).build();
    assertTrue(newDescriptor.isSafe());
    // All other fields should staty the same
    assertEquals(MethodType.UNARY, newDescriptor.getType());
    assertEquals("/package.service/method", newDescriptor.getFullMethodName());
  }

  @Test(expected = IllegalArgumentException.class)
  public void safeAndNonUnary() {
    MethodDescriptor<String, String> descriptor = MethodDescriptor.<String, String>newBuilder()
        .setType(MethodType.SERVER_STREAMING)
        .setFullMethodName("/package.service/method")
        .setRequestMarshaller(new StringMarshaller())
        .setResponseMarshaller(new StringMarshaller())
        .build();


    MethodDescriptor<String,String> discard = descriptor.toBuilder().setSafe(true).build();
    // Never reached
    assert discard == null;
  }
}