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package com.magic.processing.concurrent.task;

import com.magic.processing.commons.enums.ConcurrentTaskResultEnum;
import com.magic.processing.commons.helper.ProcessingHelper;
import com.magic.util.CollectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * 并发处理调用者指定的任务
 */
public class ConcurrentTaskSync {

    private Logger logger = LoggerFactory.getLogger(ConcurrentTaskSync.class);

    /**
     * 任务集合
     */
    private List concurrentTaskList = new ArrayList<>();

    /**
     * 超时时间
     */
    private long timeout;

    /**
     * 超时时间的单位
     */
    private TimeUnit timeUnit;

    public ConcurrentTaskSync() {
        this.timeout = 1;
        this.timeUnit = TimeUnit.MINUTES;
    }

    /**
     * 添加一个需要任务
     *
     * @param runnable           任务
     * @param concurrentTaskCall 任务执行后的回调
     * @return
     */
    public ConcurrentTaskSync add(Runnable runnable, ConcurrentTaskCall concurrentTaskCall) {
        concurrentTaskList.add(new ConcurrentTask(runnable, concurrentTaskCall));
        return this;
    }

    /**
     * 设置超时时间
     *
     * @param timeout
     * @return
     */
    public ConcurrentTaskSync setTimeout(long timeout) {
        this.timeout = timeout;
        return this;
    }

    /**
     * 设置超时时间的单位
     *
     * @param timeUnit
     * @return
     */
    public ConcurrentTaskSync setTimeUnit(TimeUnit timeUnit) {
        this.timeUnit = timeUnit;
        return this;
    }

    /**
     * 开始执行任务
     */
    public void start() {
        // 如果任务为空就抛出异常
        if (CollectionUtils.isEmpty(concurrentTaskList)) {
            throw new NullPointerException("ConcurrentTaskSync concurrentTaskList is empty");
        }

        ThreadPoolExecutor poolExecutor = new ThreadPoolExecutor(concurrentTaskList.size(),
                concurrentTaskList.size(),
                1,
                TimeUnit.MINUTES,
                new LinkedBlockingDeque<>());

        CountDownLatch count = new CountDownLatch(concurrentTaskList.size());

        // 将集合里的任务全部添加到线程池
        for (ConcurrentTask concurrentTask : concurrentTaskList) {
            poolExecutor.submit(() -> {
                try {
                    concurrentTask.runnable.run();
                    concurrentTask.concurrentTaskCall.call(ConcurrentTaskResultEnum.SUCCESS, null);
                } catch (Throwable e) {
                    logger.error("ConcurrentTaskSync error, className:{}", concurrentTask.runnable.getClass().getName(), e);
                    concurrentTask.concurrentTaskCall.call(ConcurrentTaskResultEnum.FAIL, e);
                } finally {
                    count.countDown();
                }
            });
        }

        // 等所有线程执行结束后，或者超时后，再跳出此方法
        ProcessingHelper.runnerAwait(timeout, timeUnit, count, poolExecutor);
    }

    /**
     * 存放任务的实体
     */
    class ConcurrentTask {

        /**
         * 任务的业务逻辑
         */
        private Runnable runnable;

        /**
         * 回调函数
         */
        private ConcurrentTaskCall concurrentTaskCall;

        public ConcurrentTask(Runnable runnable, ConcurrentTaskCall concurrentTaskCall) {
            this.runnable = runnable;
            this.concurrentTaskCall = concurrentTaskCall;
        }

        public Runnable getRunnable() {
            return runnable;
        }

        public ConcurrentTaskCall getConcurrentTaskCall() {
            return concurrentTaskCall;
        }
    }
}