/*
 * Copyright (C) 2018 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.quickstep;

import android.annotation.TargetApi;
import android.os.Build;
import android.view.InputEvent;
import android.view.KeyEvent;
import android.view.MotionEvent;

@TargetApi(Build.VERSION_CODES.O)
public interface InputConsumer {

    int TYPE_NO_OP = 1 << 0;
    int TYPE_OVERVIEW = 1 << 1;
    int TYPE_OTHER_ACTIVITY = 1 << 2;
    int TYPE_ASSISTANT = 1 << 3;
    int TYPE_DEVICE_LOCKED = 1 << 4;
    int TYPE_ACCESSIBILITY = 1 << 5;
    int TYPE_SCREEN_PINNED = 1 << 6;
    int TYPE_OVERVIEW_WITHOUT_FOCUS = 1 << 7;
    int TYPE_RESET_GESTURE = 1 << 8;
    int TYPE_PROGRESS_DELEGATE = 1 << 9;
    int TYPE_SYSUI_OVERLAY = 1 << 10;
    int TYPE_ONE_HANDED = 1 << 11;
    int TYPE_TASKBAR_STASH = 1 << 12;
    int TYPE_STATUS_BAR = 1 << 13;
    int TYPE_CURSOR_HOVER = 1 << 14;
    int TYPE_NAV_HANDLE_LONG_PRESS = 1 << 15;

    String[] NAMES = new String[] {
           "TYPE_NO_OP",                    // 0
            "TYPE_OVERVIEW",                // 1
            "TYPE_OTHER_ACTIVITY",          // 2
            "TYPE_ASSISTANT",               // 3
            "TYPE_DEVICE_LOCKED",           // 4
            "TYPE_ACCESSIBILITY",           // 5
            "TYPE_SCREEN_PINNED",           // 6
            "TYPE_OVERVIEW_WITHOUT_FOCUS",  // 7
            "TYPE_RESET_GESTURE",           // 8
            "TYPE_PROGRESS_DELEGATE",       // 9
            "TYPE_SYSUI_OVERLAY",           // 10
            "TYPE_ONE_HANDED",              // 11
            "TYPE_TASKBAR_STASH",           // 12
            "TYPE_STATUS_BAR",              // 13
            "TYPE_CURSOR_HOVER",            // 14
            "TYPE_NAV_HANDLE_LONG_PRESS",   // 15
    };

    InputConsumer NO_OP = () -> TYPE_NO_OP;

    int getType();

    /**
     * Returns true if the user has crossed the threshold for it to be an explicit action.
     */
    default boolean allowInterceptByParent() {
        return true;
    }

    /**
     * Returns true if the lifecycle of this input consumer is detached from the normal gesture
     * down/up flow. If so, it is the responsibility of the input consumer to call back to
     * {@link TouchInteractionService#onConsumerInactive(InputConsumer)} after the consumer is
     * finished.
     */
    default boolean isConsumerDetachedFromGesture() {
        return false;
    }

    /**
     * Handle and specific setup necessary based on the orientation of the device
     */
    default void notifyOrientationSetup() {}

    /**
     * Returns the active input consumer is in the hierarchy of this input consumer.
     */
    default InputConsumer getActiveConsumerInHierarchy() {
        return this;
    }

    /**
     * Called by the event queue when the consumer is about to be switched to a new consumer.
     * Consumers should update the state accordingly here before the state is passed to the new
     * consumer.
     */
    default void onConsumerAboutToBeSwitched() { }

    default void onMotionEvent(MotionEvent ev) { }

    default void onHoverEvent(MotionEvent ev) { }

    default void onKeyEvent(KeyEvent ev) { }

    default void onInputEvent(InputEvent ev) {
        if (ev instanceof MotionEvent) {
            onMotionEvent((MotionEvent) ev);
        } else {
            onKeyEvent((KeyEvent) ev);
        }
    }

    default String getName() {
        StringBuilder name = new StringBuilder();
        for (int i = 0; i < NAMES.length; i++) {
            if ((getType() & (1 << i)) != 0) {
                if (name.length() > 0) {
                    name.append(":");
                }
                name.append(NAMES[i]);
            }
        }
        return name.toString();
    }

    /**
     * Returns an input consumer of the given class type, or null if none is found.
     */
    default <T extends InputConsumer> T getInputConsumerOfClass(Class<T> c) {
        if (getClass().equals(c)) {
            return c.cast(this);
        }
        return null;
    }
}