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/*
 * Copyright 2021-2024 the original author or authors.
 *
 * 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.metaeffekt.artifact.analysis.utils;

public class CountdownTimer {

    private long time;
    private long startTime = -1;
    private int runningCount = 0;
    private boolean cancelled = false;

    public CountdownTimer(long time) {
        this.time = time;
    }

    public long getRemainingTime() {
        recalculateRemainingTime();
        return time;
    }

    private void recalculateRemainingTime() {
        if (isRunning()) {
            stop();
            start();
        }
    }

    public boolean isEndReached() {
        return getRemainingTime() <= 0;
    }

    public boolean isRunning() {
        return startTime != -1;
    }

    public synchronized void start() {
        if (isCancelled()) return;
        runningCount++;
        if (isRunning() || isEndReached()) return;
        startTime = System.currentTimeMillis();
    }

    public synchronized void stop() {
        if (!isRunning()) return;
        runningCount--;

        final long now = System.currentTimeMillis();
        if (runningCount <= 0) {
            time = time - (now - startTime);
            startTime = -1;
            runningCount = 0;
        } else {
            time = time - (now - startTime);
            startTime = now;
        }
    }

    public synchronized boolean isCancelled() {
        return cancelled;
    }

    public synchronized void cancel() {
        this.cancelled = true;
        runningCount = 0;
        stop();
    }
}