package io.flutter.plugin.editing;

import static org.junit.Assert.assertEquals;

import androidx.test.ext.junit.runners.AndroidJUnit4;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.MockitoAnnotations;
import org.robolectric.annotation.Config;

@Config(manifest = Config.NONE)
@RunWith(AndroidJUnit4.class)
public class TextEditingDeltaTest {
  @Before
  public void setUp() {
    MockitoAnnotations.openMocks(this);
  }

  @Test
  public void testConstructorTextEditingDelta() {
    final CharSequence oldText = "hell";
    final CharSequence textAfterChange = "hello";

    final int oldComposingStart = 0;
    final int oldComposingEnd = 4;

    final int startOfReplacementText = 0;
    final int endOfReplacementText = textAfterChange.length();

    final int newSelectionStart = 5;
    final int newSelectionEnd = 5;
    final int newComposingStart = 0;
    final int newComposingEnd = 5;

    final TextEditingDelta delta =
        new TextEditingDelta(
            oldText,
            oldComposingStart,
            oldComposingEnd,
            textAfterChange,
            newSelectionStart,
            newSelectionEnd,
            newComposingStart,
            newComposingEnd);

    assertEquals(oldText, delta.getOldText());
    assertEquals(textAfterChange, delta.getDeltaText());
    assertEquals(oldComposingStart, delta.getDeltaStart());
    assertEquals(oldComposingEnd, delta.getDeltaEnd());
    assertEquals(newSelectionStart, delta.getNewSelectionStart());
    assertEquals(newSelectionEnd, delta.getNewSelectionEnd());
    assertEquals(newComposingStart, delta.getNewComposingStart());
    assertEquals(newComposingEnd, delta.getNewComposingEnd());
  }

  @Test
  public void testNonTextUpdateConstructorTextEditingDelta() {
    final CharSequence oldText = "hello";

    final int newSelectionStart = 3;
    final int newSelectionEnd = 3;
    final int newComposingStart = 0;
    final int newComposingEnd = 5;

    final TextEditingDelta delta =
        new TextEditingDelta(
            oldText, newSelectionStart, newSelectionEnd, newComposingStart, newComposingEnd);

    assertEquals(oldText, delta.getOldText());
    assertEquals("", delta.getDeltaText());
    assertEquals(-1, delta.getDeltaStart());
    assertEquals(-1, delta.getDeltaEnd());
    assertEquals(newSelectionStart, delta.getNewSelectionStart());
    assertEquals(newSelectionEnd, delta.getNewSelectionEnd());
    assertEquals(newComposingStart, delta.getNewComposingStart());
    assertEquals(newComposingEnd, delta.getNewComposingEnd());
  }
}