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/*
 * Very basic test for the FastFlow farm in the accelerator configuration.
 *
 */
#include <vector>
#include <iostream>
#include <ff/farm.hpp>
  
using namespace ff;

// generic worker
class Worker: public ff_node {
public:
    void * svc(void * task) {
        long *t = (long *)task;
        printf("Worker(%d): received task %ld\n", get_my_id(),*t);
        return task;
    }
};

class Collector: public ff_node {
public:
    void * svc(void * task) { return task; }
};


int main(int argc, char * argv[]) {
    if (argc<3) {
        std::cerr << "use: " << argv[0] << " nworkers streamlen\n";
        return -1;
    }
    
    int nworkers=atoi(argv[1]);
    int streamlen=atoi(argv[2]);
    
    ff_farm<> farm(true);  // accelerator set
    std::vector<ff_node *> w;
    for(int i=0;i<nworkers;++i) w.push_back(new Worker);
    farm.add_workers(w);
    farm.add_collector(new Collector);

    ffTime(START_TIME);
    // Now run the accelator asynchronusly
    farm.run_then_freeze(); //  farm.run() can also be used here

    void * result=NULL;
    for (int i=0;i<streamlen;i++) {
        std::cout << "Offloading task " << i << "\n"; 
        // Here offloading computation onto the farm
        farm.offload(new long(i)); 

        // try to get results, if there are any
        if (farm.load_result_nb(&result)) {
            std::cerr << "result= " << *((long*)result) << "\n";
            delete ((long*)result);
        }
    }
    std::cout << "Offloading EOS\n";
    farm.offload((void *)FF_EOS);
   
#if 1
    // get all remaining results syncronously. 
    while(farm.load_result(&result)) {
        std::cerr << "result= " << *((long*)result) << "\n";
        delete ((long*)result);
    }
#else 
    // asynchronously wait results
    do {
        if (farm.load_result_nb(&result)) {
            if (result==(void*)FF_EOS) break;
            std::cerr << "result= " << *((long*)result) << "\n";
            delete ((long*)result);
        } 
        // do something useful here....

    } while(1);
#endif
    
    // Here join
    farm.wait();  
    ffTime(STOP_TIME);
    std::cerr << "[Main] DONE, farm time= " << farm.ffTime() << " (ms)\n";
    std::cerr << "[Main] DONE, total time= " << ffTime(GET_TIME) << " (ms)\n";
    return 0;
}