/*
 * Copyright (C) 2015 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 android.widget.espresso;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.RootMatchers.withDecorView;
import static android.support.test.espresso.matcher.ViewMatchers.hasDescendant;
import static android.support.test.espresso.matcher.ViewMatchers.hasFocus;
import static android.support.test.espresso.matcher.ViewMatchers.isAssignableFrom;
import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
import static android.support.test.espresso.matcher.ViewMatchers.isEnabled;
import static android.support.test.espresso.matcher.ViewMatchers.withText;
import static org.hamcrest.Matchers.allOf;
import static org.hamcrest.Matchers.not;

import com.android.internal.view.menu.ListMenuItemView;

import android.support.test.espresso.NoMatchingRootException;
import android.support.test.espresso.NoMatchingViewException;
import android.support.test.espresso.ViewInteraction;
import android.support.test.espresso.matcher.ViewMatchers;
import android.widget.MenuPopupWindow.MenuDropDownListView;

/**
 * Espresso utility methods for the context menu.
 */
public final class ContextMenuUtils {
    private ContextMenuUtils() {}

    private static ViewInteraction onContextMenu() {
        // TODO: Have more reliable way to get context menu.
        return onView(ViewMatchers.isAssignableFrom(MenuDropDownListView.class))
                .inRoot(withDecorView(hasFocus()));
    }

    /**
     * Asserts that the context menu is displayed
     *
     * @throws AssertionError if the assertion fails
     */
    private static void assertContextMenuIsDisplayed() {
        onContextMenu().check(matches(isDisplayed()));
    }

    /**
     * Asserts that the context menu is not displayed
     *
     * @throws AssertionError if the assertion fails
     */
    public static void assertContextMenuIsNotDisplayed() {
        try {
            assertContextMenuIsDisplayed();
        } catch (NoMatchingRootException | NoMatchingViewException | AssertionError e) {
            return;
        }
        throw new AssertionError("Context menu is displayed");
    }

    /**
     * Asserts that the context menu contains the specified item and the item has specified enabled
     *  state.
     *
     * @param itemLabel label of the item.
     * @param enabled enabled state of the item.
     * @throws AssertionError if the assertion fails
     */
    private static void asssertContextMenuContainsItemWithEnabledState(String itemLabel,
            boolean enabled) {
        onContextMenu().check(matches(
                hasDescendant(allOf(
                        isAssignableFrom(ListMenuItemView.class),
                        enabled ? isEnabled() : not(isEnabled()),
                        hasDescendant(withText(itemLabel))))));
    }

    /**
     * Asserts that the context menu contains the specified item and the item is enabled.
     *
     * @param itemLabel label of the item.
     * @throws AssertionError if the assertion fails
     */
    public static void assertContextMenuContainsItemEnabled(String itemLabel) {
        asssertContextMenuContainsItemWithEnabledState(itemLabel, true);
    }

    /**
     * Asserts that the context menu contains the specified item and the item is disabled.
     *
     * @param itemLabel label of the item.
     * @throws AssertionError if the assertion fails
     */
    public static void assertContextMenuContainsItemDisabled(String itemLabel) {
        asssertContextMenuContainsItemWithEnabledState(itemLabel, false);
    }
}