/*
 * Copyright (C) 2019 ByteDance Inc
 *
 * 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.bytedance.scene.utlity;

import android.os.Build;
import androidx.annotation.RestrictTo;
import android.view.View;

import java.util.concurrent.atomic.AtomicInteger;

import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP;

/**
 * @hide
 */
@RestrictTo(LIBRARY_GROUP)
public class ViewIdGenerator {
    private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);

    public static int generateViewId() {
        if (Build.VERSION.SDK_INT < 17) {
            for (; ; ) {
                final int result = sNextGeneratedId.get();
                // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
                int newValue = result + 1;
                if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
                if (sNextGeneratedId.compareAndSet(result, newValue)) {
                    return result;
                }
            }
        } else {
            return View.generateViewId();
        }
    }
}
