/*
 * Copyright 2016 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.CompilationTestHelper;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** {@link BoxedPrimitiveConstructor}Test */
@RunWith(JUnit4.class)
public class BoxedPrimitiveConstructorTest {

  CompilationTestHelper compilationHelper;

  @Before
  public void setUp() {
    compilationHelper =
        CompilationTestHelper.newInstance(BoxedPrimitiveConstructor.class, getClass());
  }

  @Test
  public void positive() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public class Test {
              {
                // BUG: Diagnostic contains: byte b = (byte) 0;
                byte b = new Byte((byte) 0);
                // BUG: Diagnostic contains: char c = (char) 0;
                char c = new Character((char) 0);
                // BUG: Diagnostic contains: double d = 0;
                double d = new Double(0);
                // BUG: Diagnostic contains: float f = 0;
                float f = new Float(0);
                // BUG: Diagnostic contains: int i = 0;
                int i = new Integer(0);
                // BUG: Diagnostic contains: long j = 0;
                long j = new Long(0);
                // BUG: Diagnostic contains: short s = (short) 0;
                short s = new Short((short) 0);
                Double dd = d;
                // BUG: Diagnostic contains: float f2 = dd.floatValue();
                float f2 = new Float(dd);
                // BUG: Diagnostic contains: float f3 = (float) d;
                float f3 = new Float(d);
                // BUG: Diagnostic contains: foo(Float.valueOf((float) d));
                foo(new Float(d));
              }

              public void foo(Float f) {}
            }
            """)
        .doTest();
  }

  @Test
  public void positiveStrings() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public class Test {
              {
                // BUG: Diagnostic contains: byte b = Byte.valueOf("0");
                byte b = new Byte("0");
                // BUG: Diagnostic contains: double d = Double.valueOf("0");
                double d = new Double("0");
                // BUG: Diagnostic contains: float f = Float.valueOf("0");
                float f = new Float("0");
                // BUG: Diagnostic contains: int i = Integer.valueOf("0");
                int i = new Integer("0");
                // BUG: Diagnostic contains: long j = Long.valueOf("0");
                long j = new Long("0");
                // BUG: Diagnostic contains: short s = Short.valueOf("0");
                short s = new Short("0");
              }
            }
            """)
        .doTest();
  }

  @Test
  public void booleanConstant() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public class Test {
              static final Boolean CONST = true;
              static final String CONST2 = null;

              {
                // BUG: Diagnostic contains: boolean a = true;
                boolean a = new Boolean(true);
                // BUG: Diagnostic contains: boolean b = false;
                boolean b = new Boolean(false);
                // BUG: Diagnostic contains: boolean c = Boolean.valueOf(CONST);
                boolean c = new Boolean(CONST);
                // BUG: Diagnostic contains: boolean e = true;
                boolean e = new Boolean("true");
                // BUG: Diagnostic contains: boolean f = false;
                boolean f = new Boolean("nope");
                // BUG: Diagnostic contains: boolean g = Boolean.valueOf(CONST2);
                boolean g = new Boolean(CONST2);
                // BUG: Diagnostic contains: System.err.println(Boolean.TRUE);
                System.err.println(new Boolean("true"));
                // BUG: Diagnostic contains: System.err.println(Boolean.FALSE);
                System.err.println(new Boolean("false"));
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negative() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public class Test {
              {
                String s = new String((String) null);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void autoboxing() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public abstract class Test {
              abstract int g(Integer x);

              void f(int x) {
                // BUG: Diagnostic contains: int i = x;
                int i = new Integer(x);
                // BUG: Diagnostic contains: i = g(Integer.valueOf(x));
                i = g(new Integer(x));
                // BUG: Diagnostic contains: i = (short) 0;
                i = new Integer((short) 0);
              }
            }
            """)
        .doTest();
  }

  // Tests that `new Integer(x).memberSelect` isn't unboxed to x.memberSelect
  // TODO(cushon): we could provide a better fix for byteValue(), but hopefully no one does that?
  @Test
  public void methodCall() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public abstract class Test {
              abstract int g(Integer x);

              void f(int x) {
                // BUG: Diagnostic contains: int i = Integer.valueOf(x).byteValue();
                int i = new Integer(x).byteValue();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void stringValue() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public abstract class Test {
              abstract int g(Integer x);

              void f(int x) {
                // BUG: Diagnostic contains: String s = String.valueOf(x);
                String s = new Integer(x).toString();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void compareTo() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public abstract class Test {
              abstract int g(Integer x);

              void f(int x, Integer y, double d, Double dd, Float f) {
                // BUG: Diagnostic contains: int c1 = Integer.compare(x, y);
                int c1 = new Integer(x).compareTo(y);
                // BUG: Diagnostic contains: int c2 = y.compareTo(Integer.valueOf(x));
                int c2 = y.compareTo(new Integer(x));
                // BUG: Diagnostic contains: int c3 = Float.compare((float) d, f);
                int c3 = new Float(d).compareTo(f);
                // BUG: Diagnostic contains: int c4 = Float.compare(dd.floatValue(), f);
                int c4 = new Float(dd).compareTo(f);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void hashCodeRefactoring() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            public abstract class Test {
              abstract int g(Integer x);

              int f(int x, Integer y, long z, double d, Double dd) {
                // BUG: Diagnostic contains: int h = Integer.hashCode(x);
                int h = new Integer(x).hashCode();
                // BUG: Diagnostic contains: h = Float.hashCode((float) d);
                h = new Float(d).hashCode();
                // BUG: Diagnostic contains: h = Float.hashCode(dd.floatValue());
                h = new Float(dd).hashCode();
                // BUG: Diagnostic contains: return Long.hashCode(z);
                return new Long(z).hashCode();
              }
            }
            """)
        .doTest();
  }

  public static class Super {}

  public static class Inner extends Super {}

  @Test
  public void incompleteClasspath() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            "import " + Inner.class.getCanonicalName() + ";",
            "class Test {",
            "  void m() {",
            "    new Inner();",
            "  }",
            "}")
        .withClasspath(BoxedPrimitiveConstructorTest.class, Inner.class)
        .doTest();
  }

  @Test
  public void autoboxWidening() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(float f) {
                // BUG: Diagnostic contains: (double) f;
                Double d = new Double(f);
                // BUG: Diagnostic contains: (short) (byte) 0;
                Short s = new Short((byte) 0);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void autoboxGenerics() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              <T> T f(Object o) {
                // BUG: Diagnostic contains: return (T) Integer.valueOf(o.hashCode());
                return (T) new Integer(o.hashCode());
              }
            }
            """)
        .doTest();
  }
}
