/*
 * Copyright 2019 The Android Open Source Project
 *
 * 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.android.material.datepicker;

import static com.google.common.truth.Truth.assertThat;
import static java.util.Calendar.SATURDAY;
import static java.util.Calendar.SUNDAY;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThrows;

import com.google.android.material.internal.ParcelableTestUtils;
import java.util.Calendar;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;

/** Tests for {@link CalendarConstraints} */
@RunWith(RobolectricTestRunner.class)
public class CalendarConstraintsTest {

  private static final long FEB_2016 = Month.create(2016, Calendar.FEBRUARY).timeInMillis;
  private static final long MARCH_2016 = Month.create(2016, Calendar.MARCH).timeInMillis;
  private static final long APRIL_2016 = Month.create(2016, Calendar.APRIL).timeInMillis;

  @Test
  public void equalAfterParceling() {
    CalendarConstraints originalBounds =
        new CalendarConstraints.Builder().setStart(FEB_2016).setEnd(APRIL_2016).build();
    CalendarConstraints constructedBounds =
        ParcelableTestUtils.parcelAndCreate(originalBounds, CalendarConstraints.CREATOR);
    assertEquals(originalBounds, constructedBounds);
  }

  @Test
  public void clampMonth_when_InsideBounds() {
    Month today = Month.current();
    Month yearBefore = today.monthsLater(-12);
    Month yearAfter = today.monthsLater(12);

    long start = yearBefore.timeInMillis;
    long end = yearAfter.timeInMillis;
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setStart(start).setEnd(end).build();

    Month monthWithinBounds = yearAfter.monthsLater(-5);
    assertThat(calendarConstraints.clamp(monthWithinBounds))
        .isEqualTo(monthWithinBounds);
  }

  @Test
  public void clampMonth_when_beforeLowerBound() {
    Month today = Month.current();
    Month yearBefore = today.monthsLater(-12);
    Month yearAfter = today.monthsLater(12);

    long start = yearBefore.timeInMillis;
    long end = yearAfter.timeInMillis;
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setStart(start).setEnd(end).build();

    assertThat(calendarConstraints.clamp(yearBefore.monthsLater(-5)))
        .isEqualTo(yearBefore);
  }

  @Test
  public void clampMonth_when_AfterUpperBound() {
    Month today = Month.current();
    Month yearBefore = today.monthsLater(-12);
    Month yearAfter = today.monthsLater(12);

    long start = yearBefore.timeInMillis;
    long end = yearAfter.timeInMillis;
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setStart(start).setEnd(end).build();

    assertThat(calendarConstraints.clamp(yearAfter.monthsLater(5)))
        .isEqualTo(yearAfter);
  }

  @Test
  public void currentDefaultsToStartIfTodayIsInvalid() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setStart(FEB_2016).setEnd(APRIL_2016).build();

    assertNull(calendarConstraints.getOpenAt());
  }

  @Test
  public void illegalCurrentMonthFails() {
    assertThrows(
        IllegalArgumentException.class,
        () ->
            new CalendarConstraints.Builder()
                .setStart(FEB_2016)
                .setEnd(MARCH_2016)
                .setOpenAt(APRIL_2016)
                .build());
  }

  @Test
  public void illegalEndMonthFails() {
    assertThrows(
        IllegalArgumentException.class,
        () ->
            new CalendarConstraints.Builder()
                .setStart(MARCH_2016)
                .setEnd(FEB_2016)
                .setOpenAt(MARCH_2016)
                .build());
  }

  @Test
  public void firstDayOfWeek_sunday() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setFirstDayOfWeek(SUNDAY).build();

    assertThat(calendarConstraints.getFirstDayOfWeek()).isEqualTo(SUNDAY);
  }

  @Test
  public void firstDayOfWeek_saturday() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setFirstDayOfWeek(SATURDAY).build();

    assertThat(calendarConstraints.getFirstDayOfWeek()).isEqualTo(SATURDAY);
  }

  @Test
  public void firstDayOfWeek_notSet() {
    CalendarConstraints calendarConstraints = new CalendarConstraints.Builder().build();

    assertThat(calendarConstraints.getFirstDayOfWeek()).isEqualTo(0);
  }

  @Test
  public void firstDayOfWeek_invalidBelowRange() {
    assertThrows(
        IllegalArgumentException.class,
        () -> new CalendarConstraints.Builder().setFirstDayOfWeek(-1).build());
  }

  @Test
  public void firstDayOfWeek_invalidAboveRange() {
    assertThrows(
        IllegalArgumentException.class,
        () -> new CalendarConstraints.Builder().setFirstDayOfWeek(SATURDAY + 1).build());
  }

  @Test
  public void setStart_succeeds() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setStart(FEB_2016).build();

    assertThat(calendarConstraints.getStart().timeInMillis).isEqualTo(FEB_2016);
  }

  @Test
  public void setEnd_succeeds() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setEnd(FEB_2016).build();

    assertThat(calendarConstraints.getEnd().timeInMillis).isEqualTo(FEB_2016);
  }

  @Test
  public void getStartMs_succeeds() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setStart(FEB_2016).build();

    assertThat(calendarConstraints.getStartMs()).isEqualTo(FEB_2016);
  }

  @Test
  public void getEndMs_succeeds() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setEnd(FEB_2016).build();

    assertThat(calendarConstraints.getEndMs()).isEqualTo(FEB_2016);
  }

  @Test
  public void getOpenAtMs_succeeds() {
    CalendarConstraints calendarConstraints =
        new CalendarConstraints.Builder().setOpenAt(FEB_2016).build();

    assertThat(calendarConstraints.getOpenAtMs()).isEqualTo(FEB_2016);
  }
}