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// ============================================================================
// Copyright (c) 2017-2019 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.environments;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ThreadFactory;

import functionalj.function.FuncUnit1;
import functionalj.functions.ThrowFuncs;
import functionalj.promise.DeferAction;
import functionalj.promise.Promise;
import functionalj.ref.ComputeBody;
import functionalj.ref.Run;
import functionalj.ref.RunBody;
import functionalj.ref.Substitution;
import lombok.val;

@FunctionalInterface
public interface AsyncRunner extends FuncUnit1 {
    
    public static  Promise run(RunBody runnable) {
        return run(null, runnable);
    }
    public static  Promise run(ComputeBody body) {
        return run(null, body);
    }
    public static  Promise run(AsyncRunner runner, RunBody runnable) {
        return run(runner, ()->{
            runnable.run();
            return null;
        });
    }
    public static   Promise run(AsyncRunner runner, ComputeBody body) {
        val action = DeferAction.of((Class)null).start();
        
        val theRunner     = (runner != null) ? runner : Env.async();
        val substitutions = Substitution.getCurrentSubstitutions().exclude(Substitution::isThreadLocal);
        val latch         = new CountDownLatch(1);
        theRunner.accept(()->{
            try {
                Run.with(substitutions)
                .run(()->{
                    body.prepared();
                    latch.countDown();
                    
                    val value = body.compute();
                    action.complete(value);
                });
            } catch (Exception exception) {
                action.fail(exception);
                ThrowFuncs.handleNoThrow(exception);
            } catch (Throwable exception) {
                // TODO - Make a dedicate exception.
                action.fail(new Exception(exception));
            }
        });
        
        try {
            latch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        
        val promise = action.getPromise();
        return promise;
    }
    
    
    public static final AsyncRunner onSameThread = runnable -> {
        runnable.run();
    };
    
    public static final AsyncRunner onNewThread = runnable -> {
        new Thread(runnable).start();
    };
    
    public static final AsyncRunner threadFactory = runnable -> {
        Executors.defaultThreadFactory().newThread(runnable).start();
    };
    
    public static final AsyncRunner completeableFuture = runnable -> {
        CompletableFuture.runAsync(runnable);
    };
    
    public static final AsyncRunner forkJoinPool = runnable -> {
        ForkJoinPool.commonPool().execute(runnable);
    };
    
    public static AsyncRunner threadFactory(ThreadFactory threadFactory) {
        return runnable -> threadFactory.newThread(runnable).start();
    }
    
    public static AsyncRunner executorService(ExecutorService executorService) {
        return runnable -> executorService.execute(runnable);
    }
    
}
    

    

    

            

    

            



    
    






    
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