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package com.firefly.utils.lang.pool;

import com.firefly.utils.concurrent.Atomics;
import com.firefly.utils.concurrent.Promise;
import com.firefly.utils.exception.CommonRuntimeException;
import com.firefly.utils.lang.AbstractLifeCycle;

import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author Pengtao Qiu
 */
public class BoundedAsynchronousPool extends AbstractLifeCycle implements AsynchronousPool {

    private int maxSize;
    private AtomicInteger createdObjectSize = new AtomicInteger(0);
    private long timeout = 5000L;
    private BlockingQueue> queue;
    private ExecutorService service;
    private ObjectFactory objectFactory;
    private Validator validator;
    private Dispose dispose;

    public BoundedAsynchronousPool(ObjectFactory objectFactory, Validator validator, Dispose dispose) {
        this(32, objectFactory, validator, dispose);
    }

    public BoundedAsynchronousPool(int maxSize, ObjectFactory objectFactory, Validator validator, Dispose dispose) {
        this(maxSize, 5000L, objectFactory, validator, dispose);
    }

    public BoundedAsynchronousPool(int maxSize, long timeout,
                                   ObjectFactory objectFactory, Validator validator, Dispose dispose) {
        this(maxSize, timeout,
                Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors(), r -> new Thread(r, "firefly bounded asynchronous pool")),
                objectFactory, validator, dispose);
    }

    public BoundedAsynchronousPool(int maxSize, long timeout, ExecutorService service,
                                   ObjectFactory objectFactory, Validator validator, Dispose dispose) {
        this.maxSize = maxSize;
        this.timeout = timeout;
        this.service = service;
        this.objectFactory = objectFactory;
        this.validator = validator;
        this.dispose = dispose;
        this.queue = new ArrayBlockingQueue<>(maxSize);
        start();
    }

    private Promise.Completable> createObject() {
        Promise.Completable> r = new Promise.Completable<>();
        createObject(r);
        return r;
    }

    private void createObject(Promise.Completable> completable) {
        Atomics.getAndIncrement(createdObjectSize, maxSize);
        Promise.Completable> tmp = objectFactory.createNew();
        tmp.thenAccept(completable::succeeded)
           .exceptionally(e0 -> {
               Atomics.getAndDecrement(createdObjectSize, 0);
               completable.failed(e0);
               return null;
           });
    }

    private void destroyObject(PooledObject t) {
        Atomics.getAndDecrement(createdObjectSize, 0);
        dispose.destroy(t);
    }

    @Override
    public Promise.Completable> take() {
        PooledObject t = get();
        if (t != null) {
            if (validator.isValid(t)) {
                Promise.Completable> completable = new Promise.Completable<>();
                completable.succeeded(t);
                return completable;
            } else {
                destroyObject(t);
                return createObject();
            }
        } else {
            // the queue is empty
            int availableSize = maxSize - getCreatedObjectSize();
            System.out.println("available object size -> " + availableSize);
            if (availableSize > 0) {
                return createObject();
            } else {
                Promise.Completable> completable = new Promise.Completable<>();
                service.execute(() -> {
                    try {
                        PooledObject r = queue.poll(timeout, TimeUnit.MILLISECONDS);
                        if (r != null) {
                            if (r.prepareTake()) {
                                if (validator.isValid(r)) {
                                    completable.succeeded(r);
                                } else {
                                    destroyObject(r);
                                    createObject(completable);
                                }
                            } else {
                                completable.failed(new CommonRuntimeException("the pooled object has been used"));
                            }
                        } else {
                            completable.failed(new TimeoutException("take pooled object timeout"));
                        }
                    } catch (InterruptedException e) {
                        completable.failed(e);
                    }
                });
                return completable;
            }
        }
    }

    @Override
    public void release(PooledObject t) {
        if (t != null) {
            if (t.prepareRelease()) {
                boolean success = queue.offer(t);
                if (!success) {
                    // the queue is full
                    service.execute(() -> {
                        try {
                            boolean success0 = queue.offer(t, timeout, TimeUnit.MILLISECONDS);
                            if (!success0) {
                                destroyObject(t);
                            }
                        } catch (InterruptedException e) {
                            destroyObject(t);
                        }
                    });
                }
            }
        }
    }

    @Override
    public PooledObject get() {
        PooledObject t = queue.poll();
        if (t != null) {
            if (t.prepareTake()) {
                return t;
            } else {
                return null;
            }
        } else {
            return t;
        }
    }

    @Override
    public int size() {
        return queue.size();
    }

    @Override
    public int getCreatedObjectSize() {
        return createdObjectSize.get();
    }

    @Override
    public boolean isEmpty() {
        return queue.isEmpty();
    }

    @Override
    public boolean isValid(PooledObject t) {
        return validator.isValid(t);
    }

    @Override
    protected void init() {
    }

    @Override
    protected void destroy() {
        PooledObject t;
        while ((t = queue.poll()) != null) {
            t.prepareTake();
            destroyObject(t);
        }
        if (service != null) {
            service.shutdown();
        }
    }
}