/*
 * Copyright 2019 The Error Prone Authors.
 *
 * 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.errorprone.bugpatterns;

import com.google.errorprone.BugCheckerRefactoringTestHelper;
import com.google.errorprone.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** {@link XorPower}Test */
@RunWith(JUnit4.class)
public class XorPowerTest {
  @Test
  public void positive() {
    BugCheckerRefactoringTestHelper.newInstance(XorPower.class, getClass())
        .addInputLines(
            "Test.java",
            """
            class Test {
              static final int X = 2 ^ 16;
              static final int TOO_BIG = 2 ^ 32;
              static final int Z = 2 ^ 31;
              static final int P = 10 ^ 6;
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            class Test {
              static final int X = 1 << 16;
              static final int TOO_BIG = 2 ^ 32;
              static final int Z = 1 << 31;
              static final int P = 1000000;
            }
            """)
        .doTest();
  }

  @Test
  public void negative() {
    CompilationTestHelper.newInstance(XorPower.class, getClass())
        .addSourceLines(
            "Test.java",
            """
            class Test {
              static final int X = 2 ^ 0x16;
              // BUG: Diagnostic contains:
              static final int Y = 2 ^ 32;
            }
            """)
        .doTest();
  }

  @Test
  public void positiveLongs() {
    BugCheckerRefactoringTestHelper.newInstance(XorPower.class, getClass())
        .addInputLines(
            "Test.java",
            """
            class Test {
              static final long X = 2L ^ 16;
              static final long Y = 2L ^ 32;
              static final long Z = 2L ^ 31;
              static final long TOO_BIG = 2L ^ 64;
              static final long P = 10L ^ 6;
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            class Test {
              static final long X = 1L << 16;
              static final long Y = 1L << 32;
              static final long Z = 1L << 31;
              static final long TOO_BIG = 2L ^ 64;
              static final long P = 1000000L;
            }
            """)
        .doTest();
  }

  @Test
  public void precedence() {
    BugCheckerRefactoringTestHelper.newInstance(XorPower.class, getClass())
        .addInputLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                int x = i * 2 ^ 16;
                int y = i * 10 ^ 3;
              }
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                int x = i * (1 << 16);
                int y = i * 1000;
              }
            }
            """)
        .doTest();
  }
}
