/*
 * Copyright (c) 2015-present, Parse, LLC.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
package com.parse;

import android.os.Parcel;

import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Matchers;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;

import java.io.File;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;

import bolts.Task;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@RunWith(RobolectricTestRunner.class)
@Config(constants = BuildConfig.class, sdk = TestHelper.ROBOLECTRIC_SDK_VERSION)
public class ParseFileTest {

  @Rule
  public TemporaryFolder temporaryFolder = new TemporaryFolder();

  @Before
  public void setup() {
    ParseCorePlugins.getInstance().reset();
    ParseTestUtils.setTestParseUser();
  }

  @After
  public void tearDown() {
    ParseCorePlugins.getInstance().reset();
  }

  @Test
  public void testConstructor() throws Exception {
    String name = "name";
    byte[] data = "hello".getBytes();
    String contentType = "content_type";
    File file = temporaryFolder.newFile(name);

    // TODO(mengyan): After we have proper staging strategy, we should verify the staging file's
    // content is the same with the original file.

    ParseFile parseFile = new ParseFile(name, data, contentType);
    assertEquals("name", parseFile.getName());
    assertEquals("content_type", parseFile.getState().mimeType());
    assertTrue(parseFile.isDirty());

    parseFile = new ParseFile(data);
    assertEquals("file", parseFile.getName()); // Default
    assertEquals(null, parseFile.getState().mimeType());
    assertTrue(parseFile.isDirty());

    parseFile = new ParseFile(name, data);
    assertEquals("name", parseFile.getName());
    assertEquals(null, parseFile.getState().mimeType());
    assertTrue(parseFile.isDirty());

    parseFile = new ParseFile(data, contentType);
    assertEquals("file", parseFile.getName()); // Default
    assertEquals("content_type", parseFile.getState().mimeType());
    assertTrue(parseFile.isDirty());

    parseFile = new ParseFile(file);
    assertEquals(name, parseFile.getName()); // Default
    assertEquals(null, parseFile.getState().mimeType());
    assertTrue(parseFile.isDirty());

    parseFile = new ParseFile(file, contentType);
    assertEquals(name, parseFile.getName()); // Default
    assertEquals("content_type", parseFile.getState().mimeType());
  }

  @Test
  public void testGetters() {
    ParseFile file = new ParseFile(new ParseFile.State.Builder().url("http://example.com").build());
    assertEquals("http://example.com", file.getUrl());
    assertFalse(file.isDirty());

    // Note: rest of the getters are tested in `testConstructor`
  }

  @Test
  public void testIsDataAvailableCachedInMemory() {
    ParseFile file = new ParseFile(new ParseFile.State.Builder().build());
    file.data = "hello".getBytes();
    assertTrue(file.isDataAvailable());
  }

  @Test
  public void testIsDataAvailableCachedInController() {
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.isDataAvailable(any(ParseFile.State.class))).thenReturn(true);

    ParseCorePlugins.getInstance().registerFileController(controller);

    ParseFile.State state = new ParseFile.State.Builder().build();
    ParseFile file = new ParseFile(state);

    assertTrue(file.isDataAvailable());
    verify(controller).isDataAvailable(state);
  }

  //region testSaveAsync

  @Test
  public void testSaveAsyncNotDirty() throws Exception {
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.isDataAvailable(any(ParseFile.State.class))).thenReturn(true);

    ParseCorePlugins.getInstance().registerFileController(controller);

    ParseFile.State state = new ParseFile.State.Builder().url("http://example.com").build();
    ParseFile file = new ParseFile(state);

    Task<Void> task = file.saveAsync(null, null, null);
    ParseTaskUtils.wait(task);

    verify(controller, never()).saveAsync(
        any(ParseFile.State.class),
        any(byte[].class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any());
  }

  @Test
  public void testSaveAsyncCancelled() throws Exception {
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.isDataAvailable(any(ParseFile.State.class))).thenReturn(true);

    ParseCorePlugins.getInstance().registerFileController(controller);

    ParseFile.State state = new ParseFile.State.Builder().build();
    ParseFile file = new ParseFile(state);

    Task<Void> task = file.saveAsync(null, null, Task.<Void>cancelled());
    task.waitForCompletion();
    assertTrue(task.isCancelled());

    verify(controller, never()).saveAsync(
        any(ParseFile.State.class),
        any(byte[].class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any());
  }

  @Test
  public void testSaveAsyncSuccessWithData() throws Exception {
    String name = "name";
    byte[] data = "hello".getBytes();
    String contentType = "content_type";
    String url = "url";
    ParseFile.State state = new ParseFile.State.Builder()
        .url(url)
        .build();
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.saveAsync(
        any(ParseFile.State.class),
        any(byte[].class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(state));
    ParseCorePlugins.getInstance().registerFileController(controller);

    ParseFile parseFile = new ParseFile(name, data, contentType);
    ParseTaskUtils.wait(parseFile.saveAsync(null, null, null));

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptor = ArgumentCaptor.forClass(ParseFile.State.class);
    ArgumentCaptor<byte[]> dataCaptor = ArgumentCaptor.forClass(byte[].class);
    verify(controller, times(1)).saveAsync(
        stateCaptor.capture(),
        dataCaptor.capture(),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any());
    assertNull(stateCaptor.getValue().url());
    assertEquals(name, stateCaptor.getValue().name());
    assertEquals(contentType, stateCaptor.getValue().mimeType());
    assertArrayEquals(data, dataCaptor.getValue());
    // Verify the state of ParseFile has been updated
    assertEquals(url, parseFile.getUrl());
  }

  @Test
  public void testSaveAsyncSuccessWithFile() throws Exception {
    String name = "name";
    File file = temporaryFolder.newFile(name);
    String contentType = "content_type";
    String url = "url";
    ParseFile.State state = new ParseFile.State.Builder()
        .url(url)
        .build();
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.saveAsync(
        any(ParseFile.State.class),
        any(File.class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(state));
    ParseCorePlugins.getInstance().registerFileController(controller);

    ParseFile parseFile = new ParseFile(file, contentType);
    ParseTaskUtils.wait(parseFile.saveAsync(null, null, null));

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptor = ArgumentCaptor.forClass(ParseFile.State.class);
    ArgumentCaptor<File> fileCaptor = ArgumentCaptor.forClass(File.class);
    verify(controller, times(1)).saveAsync(
        stateCaptor.capture(),
        fileCaptor.capture(),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any());
    assertNull(stateCaptor.getValue().url());
    assertEquals(name, stateCaptor.getValue().name());
    assertEquals(contentType, stateCaptor.getValue().mimeType());
    assertEquals(file, fileCaptor.getValue());
    // Verify the state of ParseFile has been updated
    assertEquals(url, parseFile.getUrl());
  }

  // TODO(grantland): testSaveAsyncNotDirtyAfterQueueAwait
  // TODO(grantland): testSaveAsyncSuccess
  // TODO(grantland): testSaveAsyncFailure

  //endregion


  //region testGetDataAsync

  @Test
  public void testGetDataAsyncSuccess() throws Exception {
    String content = "content";
    File file = temporaryFolder.newFile("test");
    ParseFileUtils.writeStringToFile(file, content, "UTF-8");
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.fetchAsync(
        any(ParseFile.State.class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(file));
    ParseCorePlugins.getInstance().registerFileController(controller);

    String url = "url";
    ParseFile.State state = new ParseFile.State.Builder()
        .url(url)
        .build();
    ParseFile parseFile = new ParseFile(state);

    byte[] data = ParseTaskUtils.wait(parseFile.getDataInBackground());

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptor = ArgumentCaptor.forClass(ParseFile.State.class);
    verify(controller, times(1)).fetchAsync(
        stateCaptor.capture(),
        anyString(),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any()
    );
    assertEquals(url, stateCaptor.getValue().url());
    // Verify the data we get is correct
    assertArrayEquals(content.getBytes(), data);

    // Make sure we always get the data from network
    byte[] dataAgain = ParseTaskUtils.wait(parseFile.getDataInBackground());

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptorAgain =
        ArgumentCaptor.forClass(ParseFile.State.class);
    verify(controller, times(2)).fetchAsync(
        stateCaptorAgain.capture(),
        anyString(),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any()
    );
    assertEquals(url, stateCaptorAgain.getValue().url());
    // Verify the data we get is correct
    assertArrayEquals(content.getBytes(), dataAgain);
  }

  @Test
  public void testGetDataStreamAsyncSuccess() throws Exception {
    String content = "content";
    File file = temporaryFolder.newFile("test");
    ParseFileUtils.writeStringToFile(file, content, "UTF-8");
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.fetchAsync(
        any(ParseFile.State.class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(file));
    ParseCorePlugins.getInstance().registerFileController(controller);

    String url = "url";
    ParseFile.State state = new ParseFile.State.Builder()
        .url(url)
        .build();
    ParseFile parseFile = new ParseFile(state);

    InputStream dataStream = ParseTaskUtils.wait(parseFile.getDataStreamInBackground());

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptor = ArgumentCaptor.forClass(ParseFile.State.class);
    verify(controller, times(1)).fetchAsync(
        stateCaptor.capture(),
        anyString(),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any()
    );
    assertEquals(url, stateCaptor.getValue().url());
    // Verify the data we get is correct
    assertArrayEquals(content.getBytes(), ParseIOUtils.toByteArray(dataStream));

    // Make sure we always get the data from network
    InputStream dataStreamAgain = ParseTaskUtils.wait(parseFile.getDataStreamInBackground());

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptorAgain =
        ArgumentCaptor.forClass(ParseFile.State.class);
    verify(controller, times(2)).fetchAsync(
        stateCaptorAgain.capture(),
        anyString(),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any()
    );
    assertEquals(url, stateCaptorAgain.getValue().url());
    // Verify the data we get is correct
    assertArrayEquals(content.getBytes(), ParseIOUtils.toByteArray(dataStreamAgain));
  }

  @Test
  public void testGetFileAsyncSuccess() throws Exception {
    String content = "content";
    File file = temporaryFolder.newFile("test");
    ParseFileUtils.writeStringToFile(file, content, "UTF-8");
    ParseFileController controller = mock(ParseFileController.class);
    when(controller.fetchAsync(
        any(ParseFile.State.class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(file));
    ParseCorePlugins.getInstance().registerFileController(controller);

    String url = "url";
    ParseFile.State state = new ParseFile.State.Builder()
        .url(url)
        .build();
    ParseFile parseFile = new ParseFile(state);

    File fetchedFile = ParseTaskUtils.wait(parseFile.getFileInBackground());

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptor = ArgumentCaptor.forClass(ParseFile.State.class);
    verify(controller, times(1)).fetchAsync(
        stateCaptor.capture(),
        anyString(),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any()
    );
    assertEquals(url, stateCaptor.getValue().url());
    // Verify the data we get is correct
    assertArrayEquals(content.getBytes(), ParseFileUtils.readFileToByteArray(fetchedFile));

    // Make sure we always get the data from network
    File fetchedFileAgain = ParseTaskUtils.wait(parseFile.getFileInBackground());

    // Verify controller get the correct data
    ArgumentCaptor<ParseFile.State> stateCaptorAgain =
        ArgumentCaptor.forClass(ParseFile.State.class);
    verify(controller, times(2)).fetchAsync(
        stateCaptorAgain.capture(),
        anyString(),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any()
    );
    assertEquals(url, stateCaptorAgain.getValue().url());
    // Verify the data we get is correct
    assertArrayEquals(content.getBytes(), ParseFileUtils.readFileToByteArray(fetchedFileAgain));
  }

  //endregion

  @Test
  public void testTaskQueuedMethods() throws Exception {
    ParseFile.State state = new ParseFile.State.Builder().build();
    File cachedFile = temporaryFolder.newFile("temp");

    ParseFileController controller = mock(ParseFileController.class);
    when(controller.saveAsync(
        any(ParseFile.State.class),
        any(byte[].class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(state));
    when(controller.saveAsync(
        any(ParseFile.State.class),
        any(File.class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(state));
    when(controller.fetchAsync(
        any(ParseFile.State.class),
        any(String.class),
        any(ProgressCallback.class),
        Matchers.<Task<Void>>any())).thenReturn(Task.forResult(cachedFile));

    ParseCorePlugins.getInstance().registerFileController(controller);

    ParseFile file = new ParseFile(state);

    TaskQueueTestHelper queueHelper = new TaskQueueTestHelper(file.taskQueue);
    queueHelper.enqueue();

    Task<Void> saveTaskA = file.saveAsync(null, null, null);
    queueHelper.enqueue();
    Task<byte[]> getDataTaskA = file.getDataInBackground();
    queueHelper.enqueue();
    Task<Void> saveTaskB = file.saveAsync(null, null, null);
    queueHelper.enqueue();
    Task<byte[]> getDataTaskB = file.getDataInBackground();

    Thread.sleep(50);
    assertFalse(saveTaskA.isCompleted());
    queueHelper.dequeue();
    ParseTaskUtils.wait(saveTaskA);

    Thread.sleep(50);
    assertFalse(getDataTaskA.isCompleted());
    queueHelper.dequeue();
    ParseTaskUtils.wait(getDataTaskA);

    Thread.sleep(50);
    assertFalse(saveTaskB.isCompleted());
    queueHelper.dequeue();
    ParseTaskUtils.wait(saveTaskB);

    Thread.sleep(50);
    assertFalse(getDataTaskB.isCompleted());
    queueHelper.dequeue();
    ParseTaskUtils.wait(getDataTaskB);
  }

  @Test
  public void testCancel() {
    ParseFile file = new ParseFile(new ParseFile.State.Builder().build());

    TaskQueueTestHelper queueHelper = new TaskQueueTestHelper(file.taskQueue);
    queueHelper.enqueue();

    List<Task<Void>> saveTasks = Arrays.asList(
        file.saveInBackground(),
        file.saveInBackground(),
        file.saveInBackground());

    List<Task<byte[]>> getDataTasks = Arrays.asList(
        file.getDataInBackground(),
        file.getDataInBackground(),
        file.getDataInBackground());

    file.cancel();
    queueHelper.dequeue();

    for (int i = 0; i < saveTasks.size(); i++ ) {
      assertTrue("Task #" + i + " was not cancelled", saveTasks.get(i).isCancelled());
    }
    for (int i = 0; i < getDataTasks.size(); i++ ) {
      assertTrue("Task #" + i + " was not cancelled", getDataTasks.get(i).isCancelled());
    }
  }

  @Test
  public void testParcelable() {
    String mime = "mime";
    String name = "name";
    String url = "url";
    ParseFile file = new ParseFile(new ParseFile.State.Builder()
        .name(name)
        .mimeType(mime)
        .url(url)
        .build());
    Parcel parcel = Parcel.obtain();
    file.writeToParcel(parcel, 0);
    parcel.setDataPosition(0);
    file = ParseFile.CREATOR.createFromParcel(parcel);
    assertEquals(file.getName(), name);
    assertEquals(file.getUrl(), url);
    assertEquals(file.getState().mimeType(), mime);
    assertFalse(file.isDirty());
  }

  @Test( expected = RuntimeException.class )
  public void testDontParcelIfDirty() {
    ParseFile file = new ParseFile(new ParseFile.State.Builder().build());
    Parcel parcel = Parcel.obtain();
    file.writeToParcel(parcel, 0);
  }

  // TODO(grantland): testEncode
  // TODO(grantland): testDecode
}