package org.microg.gms.common.api;

import android.os.Looper;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.Result;
import com.google.android.gms.common.api.ResultCallback;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class AbstractPendingResult<R extends Result> implements PendingResult<R> {
    private final Object lock = new Object();
    private final CountDownLatch countDownLatch = new CountDownLatch(1);
    private final CallbackHandler<R> handler;
    private boolean canceled;
    private R result;
    private ResultCallback<R> resultCallback;

    public AbstractPendingResult(Looper looper) {
        handler = new CallbackHandler<R>(looper);
    }

    private R getResult() {
        synchronized (lock) {
            return result;
        }
    }

    @Override
    public R await() {
        try {
            countDownLatch.await();
        } catch (InterruptedException ignored) {
        }
        return getResult();
    }

    @Override
    public R await(long time, TimeUnit unit) {
        try {
            countDownLatch.await(time, unit);
        } catch (InterruptedException ignored) {
        }
        return getResult();
    }

    @Override
    public void cancel() {
        // TODO
    }

    @Override
    public boolean isCanceled() {
        synchronized (lock) {
            return canceled;
        }
    }

    public boolean isReady() {
        return this.countDownLatch.getCount() == 0L;
    }

    @Override
    public void setResultCallback(ResultCallback<R> callback, long time, TimeUnit unit) {
        synchronized (lock) {
            if (!isCanceled()) {
                if (isReady()) {
                    handler.sendResultCallback(callback, getResult());
                } else {
                    handler.sendTimeoutResultCallback(this, unit.toMillis(time));
                }
            }
        }
    }

    @Override
    public void setResultCallback(ResultCallback<R> callback) {
        synchronized (lock) {
            if (!isCanceled()) {
                if (isReady()) {
                    handler.sendResultCallback(callback, getResult());
                } else {
                    resultCallback = callback;
                }
            }
        }
    }
    
    private void deliverResult(R result) {
        this.result = result;
        countDownLatch.countDown();
        
    }

    public void setResult(R result) {
        this.result = result;
    }
}