/*
 * GSON Joda Time Serialisers
 *
 * Copyright 2019 Greg Kopff
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.fatboyindustrial.gsonjodatime;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import org.joda.time.Instant;
import org.junit.Test;

import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.nullValue;
import static org.junit.Assert.assertThat;

/**
 *  Tests for {@link InstantConverter}.
 */
public class InstantConverterTest
{
  /**
   *  Tests that the {@link Instant} can be round-tripped.
   */
  @Test
  public void testRoundtrip()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();
    final Instant ldt = new Instant();

    assertThat(gson.fromJson(gson.toJson(ldt), Instant.class), is(ldt));
  }

  /**
   * Tests that deserialising an empty string returns null
   */
  @Test
  public void testDeserialiseEmptyString()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();

    assertThat(gson.fromJson("", Instant.class), is(nullValue()));
  }

  /**
   * Tests that deserialising a null string returns null
   */
  @Test
  public void testDeserialiseNullString()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();

    assertThat(gson.fromJson((String) null, Instant.class), is(nullValue()));
  }

  /**
   * Tests that deserialising an ISO 8601 string with milliseconds returns an instant with milliseconds
   */
  @Test
  public void testDeserialiseWithMilliseconds()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();
    final String json = "\"2019-07-23T00:06:12.123Z\"";
    final String expectedStr = "2019-07-23T00:06:12.123Z";
    final Instant expected = Instant.parse("2019-07-23T00:06:12.123Z");

    final Instant reconstituted = gson.fromJson(json, Instant.class);

    assertThat(reconstituted.getMillis(), is(expected.getMillis()));
    assertThat(reconstituted.toString(), is(expectedStr));
    assertThat(reconstituted, is(expected));
  }

  /**
   * Tests that deserialising an ISO 8601 string without milliseconds returns an instant with zero milliseconds
   */
  @Test
  public void testDeserialiseWithoutMilliseconds()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();
    final String json = "\"2019-07-23T00:06:12Z\"";
    final String expectedStr = "2019-07-23T00:06:12.000Z";
    final Instant expected = Instant.parse("2019-07-23T00:06:12.000Z");

    final Instant reconstituted = gson.fromJson(json, Instant.class);

    assertThat(reconstituted.getMillis(), is(expected.getMillis()));
    assertThat(reconstituted.toString(), is(expectedStr));
    assertThat(reconstituted, is(expected));
  }

  /**
   * Tests that deserialising an ISO 8601 string with microseconds returns an instant with milliseconds portion of string
   */
  @Test
  public void testDeserialiseWithMicroseconds()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();
    final String json = "\"2019-07-23T00:06:12.123456Z\"";
    final String expectedStr = "2019-07-23T00:06:12.123Z";
    final Instant expected = Instant.parse("2019-07-23T00:06:12.123Z");

    final Instant reconstituted = gson.fromJson(json, Instant.class);

    assertThat(reconstituted.getMillis(), is(expected.getMillis()));
    assertThat(reconstituted.toString(), is(expectedStr));
    assertThat(reconstituted, is(expected));
  }

  /**
   * Tests that deserialising an ISO 8601 string with a timezone returns an instant (converted to utc)
   */
  @Test
  public void testDeserialiseWithTimezoneOffset()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();
    final String json = "\"2019-07-23T01:06:12.123+01:00\"";
    final String expectedStr = "2019-07-23T00:06:12.123Z";
    final Instant expected = Instant.parse("2019-07-23T01:06:12.123+01:00");

    final Instant reconstituted = gson.fromJson(json, Instant.class);

    assertThat(reconstituted.toString(), is(expectedStr));
    assertThat(reconstituted, is(expected));
  }

  /**
   * Tests that serialising an instant with milliseconds returns the expected ISO 8601 string
   */
  @Test
  public void testSerialiseWithMilliseconds()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();
    final Instant instant = Instant.parse("2019-07-23T00:06:12.123Z");
    final String expectedJson = "\"2019-07-23T00:06:12.123Z\"";

    final String actualJson = gson.toJson(instant);

    assertThat(actualJson, is(expectedJson));
  }

  /**
   * Tests that serialising an instant with out milliseconds returns the expected ISO 8601 string
   */
  @Test
  public void testSerialiseWithOutMilliseconds()
  {
    final Gson gson = Converters.registerInstant(new GsonBuilder()).create();
    final Instant instant = Instant.parse("2019-07-23T00:06:12Z");
    final String expectedJson = "\"2019-07-23T00:06:12.000Z\"";

    final String actualJson = gson.toJson(instant);

    assertThat(actualJson, is(expectedJson));
  }
}