/*
 * Copyright (C) 2016 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.android.documentsui.selection;

import static com.android.documentsui.testing.TestEvents.Touch.TAP;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import android.support.annotation.Nullable;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;
import android.support.v7.widget.RecyclerView;
import android.view.MotionEvent;

import com.android.documentsui.selection.SelectionHelper;
import com.android.documentsui.selection.ItemDetailsLookup.ItemDetails;
import com.android.documentsui.selection.TouchInputHandler.Callbacks;
import com.android.documentsui.selection.testing.SelectionHelpers;
import com.android.documentsui.selection.testing.SelectionProbe;
import com.android.documentsui.selection.testing.TestData;
import com.android.documentsui.selection.testing.TestSelectionPredicate;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import java.util.List;

@RunWith(AndroidJUnit4.class)
@SmallTest
public final class TouchInputHandlerTest {

    private static final List<String> ITEMS = TestData.create(100);

    private TouchInputHandler mInputDelegate;
    private SelectionHelper mSelectionMgr;
    private TestSelectionPredicate mSelectionPredicate;
    private TestRunnable mGestureStarted;
    private TestCallbacks mCallbacks;
    private TestItemDetailsLookup mDetailsLookup;
    private SelectionProbe mSelection;

    @Before
    public void setUp() {
        mSelectionMgr = SelectionHelpers.createTestInstance(ITEMS);
        mDetailsLookup = new TestItemDetailsLookup();
        mSelectionPredicate = new TestSelectionPredicate();
        mSelection = new SelectionProbe(mSelectionMgr);
        mGestureStarted = new TestRunnable();
        mCallbacks = new TestCallbacks();

        mInputDelegate = new TouchInputHandler(
                mSelectionMgr,
                mDetailsLookup,
                mSelectionPredicate,
                mGestureStarted,
                mCallbacks);
    }

    @Test
    public void testTap_ActivatesWhenNoExistingSelection() {
        ItemDetails doc = mDetailsLookup.initAt(11);
        mInputDelegate.onSingleTapUp(TAP);

        mCallbacks.assertActivated(doc);
    }

    @Test
    public void testScroll_shouldNotBeTrapped() {
        assertFalse(mInputDelegate.onScroll(null, TAP, -1, -1));
    }

    @Test
    public void testLongPress_SelectsItem() {
        mSelectionPredicate.setReturnValue(true);

        mDetailsLookup.initAt(7);
        mInputDelegate.onLongPress(TAP);

        mSelection.assertSelection(7);
    }

    @Test
    public void testLongPress_StartsGestureSelection() {
        mSelectionPredicate.setReturnValue(true);

        mDetailsLookup.initAt(7);
        mInputDelegate.onLongPress(TAP);
        mGestureStarted.assertRan();
    }

    @Test
    public void testSelectHotspot_StartsSelectionMode() {
        mSelectionPredicate.setReturnValue(true);

        mDetailsLookup.initAt(7).setInItemSelectRegion(true);
        mInputDelegate.onSingleTapUp(TAP);

        mSelection.assertSelection(7);
    }

    @Test
    public void testSelectionHotspot_UnselectsSelectedItem() {
        mSelectionMgr.select("11");

        mDetailsLookup.initAt(11).setInItemSelectRegion(true);
        mInputDelegate.onSingleTapUp(TAP);

        mSelection.assertNoSelection();
    }

    @Test
    public void testStartsSelection_PerformsHapticFeedback() {
        mSelectionPredicate.setReturnValue(true);

        mDetailsLookup.initAt(7);
        mInputDelegate.onLongPress(TAP);

        mCallbacks.assertVibrated();
    }

    @Test
    public void testLongPress_AddsToSelection() {
        mSelectionPredicate.setReturnValue(true);

        mDetailsLookup.initAt(7);
        mInputDelegate.onLongPress(TAP);

        mDetailsLookup.initAt(99);
        mInputDelegate.onLongPress(TAP);

        mDetailsLookup.initAt(13);
        mInputDelegate.onLongPress(TAP);

        mSelection.assertSelection(7, 13, 99);
    }

    @Test
    public void testTap_UnselectsSelectedItem() {
        mSelectionMgr.select("11");

        mDetailsLookup.initAt(11);
        mInputDelegate.onSingleTapUp(TAP);

        mSelection.assertNoSelection();
    }

    @Test
    public void testTapOff_ClearsSelection() {
        mSelectionMgr.select("7");
        mDetailsLookup.initAt(7);

        mInputDelegate.onLongPress(TAP);

        mSelectionMgr.select("11");
        mDetailsLookup.initAt(11);
        mInputDelegate.onSingleTapUp(TAP);

        mDetailsLookup.initAt(RecyclerView.NO_POSITION).setInItemSelectRegion(false);
        mInputDelegate.onSingleTapUp(TAP);

        mSelection.assertNoSelection();
    }

    private static final class TestCallbacks extends TouchInputHandler.Callbacks {

        private @Nullable ItemDetails mActivated;
        private boolean mVibrated;

        @Override
        public boolean onItemActivated(ItemDetails item, MotionEvent e) {
            mActivated = item;
            return false;
        }

        @Override
        public boolean onDragInitiated(MotionEvent e) {
            return false;
        }

        @Override
        public void onPerformHapticFeedback() {
            mVibrated = true;
        }

        private void assertActivated(ItemDetails expected) {
            assertEquals(expected, mActivated);
        }

        private void assertVibrated() {
            assertTrue(mVibrated);
        }
    }

    private static final class TestRunnable implements Runnable {

        private boolean mWasRun;

        @Override
        public void run() {
            mWasRun = true;
        }

        void assertRan() {
            assertTrue(mWasRun);
        }
    }
}