/*
    Copyright 2005-2014 Intel Corporation.  All Rights Reserved.

    This file is part of Threading Building Blocks. Threading Building Blocks is free software;
    you can redistribute it and/or modify it under the terms of the GNU General Public License
    version 2  as  published  by  the  Free Software Foundation.  Threading Building Blocks is
    distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
    implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    See  the GNU General Public License for more details.   You should have received a copy of
    the  GNU General Public License along with Threading Building Blocks; if not, write to the
    Free Software Foundation, Inc.,  51 Franklin St,  Fifth Floor,  Boston,  MA 02110-1301 USA

    As a special exception,  you may use this file  as part of a free software library without
    restriction.  Specifically,  if other files instantiate templates  or use macros or inline
    functions from this file, or you compile this file and link it with other files to produce
    an executable,  this file does not by itself cause the resulting executable to be covered
    by the GNU General Public License. This exception does not however invalidate any other
    reasons why the executable file might be covered by the GNU General Public License.
*/

#include "harness_graph.h"
#include "harness_barrier.h"
#include "tbb/task_scheduler_init.h"

const int T = 4;
const int W = 4;

struct decrement_wait : NoAssign {

    tbb::flow::graph * const my_graph;
    bool * const my_done_flag;

    decrement_wait( tbb::flow::graph &h, bool *done_flag ) : my_graph(&h), my_done_flag(done_flag) {}

    void operator()(int i) const {
        Harness::Sleep(10*i);
        my_done_flag[i] = true;
        my_graph->decrement_wait_count();
    }
};

static void test_wait_count() {
   tbb::flow::graph h;
   for (int i = 0; i < T; ++i ) {
       bool done_flag[W];
       for (int j = 0; j < W; ++j ) {
           for ( int w = 0; w < W; ++w ) done_flag[w] = false;
           for ( int w = 0; w < j; ++w ) h.increment_wait_count();

           NativeParallelFor( j, decrement_wait(h, done_flag) );
           h.wait_for_all();
           for ( int w = 0; w < W; ++w ) {
              if ( w < j ) ASSERT( done_flag[w] == true, NULL );
              else ASSERT( done_flag[w] == false, NULL );
           }
       }
   }
}

const int F = 100;

#if __TBB_LAMBDAS_PRESENT
bool lambda_flag[F];
#endif
bool functor_flag[F];

struct set_functor {
    int my_i;
    set_functor( int i ) : my_i(i) {} 
    void operator()() { functor_flag[my_i] = true; }
};

struct return_functor {
    int my_i;
    return_functor( int i ) : my_i(i) {} 
    int operator()() { return my_i; }
};

static void test_run() {
    tbb::flow::graph h;
    for (int i = 0; i < T; ++i ) {

        // Create receivers and flag arrays
        #if __TBB_LAMBDAS_PRESENT
        harness_mapped_receiver<int> lambda_r;
        lambda_r.initialize_map( F, 1 );
        #endif
        harness_mapped_receiver<int> functor_r;
        functor_r.initialize_map( F, 1 );

        // Initialize flag arrays
        for (int j = 0; j < F; ++j ) {
            #if __TBB_LAMBDAS_PRESENT
            lambda_flag[j] = false;
            #endif
            functor_flag[j] = false;
        }

        for ( int j = 0; j < F; ++j ) {
            #if __TBB_LAMBDAS_PRESENT
                h.run( [=]() { lambda_flag[j] = true; } );  
                h.run( lambda_r, [=]() { return j; } );  
            #endif
            h.run( set_functor(j) );
            h.run( functor_r, return_functor(j) );
        } 
        h.wait_for_all();
        for ( int j = 0; j < F; ++j ) {
        #if __TBB_LAMBDAS_PRESENT
            ASSERT( lambda_flag[i] == true, NULL );
        #endif
            ASSERT( functor_flag[i] == true, NULL );
        }
        #if __TBB_LAMBDAS_PRESENT
        lambda_r.validate();
        #endif
        functor_r.validate();
    }
}

// Encapsulate object we want to store in vector (because contained type must have
// copy constructor and assignment operator
class my_int_buffer {
    tbb::flow::buffer_node<int> *b;
    tbb::flow::graph& my_graph;
public:
    my_int_buffer(tbb::flow::graph &g) : my_graph(g) { b = new tbb::flow::buffer_node<int>(my_graph); }
    my_int_buffer(const my_int_buffer& other) : my_graph(other.my_graph) {
        b = new tbb::flow::buffer_node<int>(my_graph);
    }
    ~my_int_buffer() { delete b; }
    my_int_buffer& operator=(const my_int_buffer& /*other*/) {
        return *this;
    }
};

// test the graph iterator, delete nodes from graph, test again
void test_iterator() {
   tbb::flow::graph g;
   my_int_buffer a_buffer(g);
   my_int_buffer b_buffer(g);
   my_int_buffer c_buffer(g);
   my_int_buffer *d_buffer = new my_int_buffer(g);
   my_int_buffer e_buffer(g);
   std::vector< my_int_buffer > my_buffer_vector(10, c_buffer);

   int count = 0;
   for (tbb::flow::graph::iterator it = g.begin(); it != g.end(); ++it) {
       count++;
   }
   ASSERT(count==15, "error in iterator count");

   delete d_buffer;

   count = 0;
   for (tbb::flow::graph::iterator it = g.begin(); it != g.end(); ++it) {
       count++;
   }
   ASSERT(count==14, "error in iterator count");

   my_buffer_vector.clear();

   count = 0;
   for (tbb::flow::graph::iterator it = g.begin(); it != g.end(); ++it) {
       count++;
   }
   ASSERT(count==4, "error in iterator count");
}

class AddRemoveBody : NoAssign {
    tbb::flow::graph& g;
    int nThreads;
    Harness::SpinBarrier &barrier;
public:
    AddRemoveBody(int nthr, Harness::SpinBarrier &barrier_, tbb::flow::graph& _g) : 
        g(_g), nThreads(nthr), barrier(barrier_) 
    {}
    void operator()(const int /*threadID*/) const {
        my_int_buffer b(g);
        {
            std::vector<my_int_buffer> my_buffer_vector(100, b);
            barrier.wait();  // wait until all nodes are created
            // now test that the proper number of nodes were created
            int count = 0;
            for (tbb::flow::graph::iterator it = g.begin(); it != g.end(); ++it) {
                count++;
            }
            ASSERT(count==101*nThreads, "error in iterator count");
            barrier.wait();  // wait until all threads are done counting
        } // all nodes but for the initial node on this thread are deleted
        barrier.wait(); // wait until all threads have deleted all nodes in their vectors
        // now test that all the nodes were deleted except for the initial node
        int count = 0;
        for (tbb::flow::graph::iterator it = g.begin(); it != g.end(); ++it) {
            count++;
        }
        ASSERT(count==nThreads, "error in iterator count"); 
        barrier.wait();  // wait until all threads are done counting
    } // initial node gets deleted
};

void test_parallel(int nThreads) {
    tbb::flow::graph g;
    Harness::SpinBarrier barrier(nThreads);
    AddRemoveBody body(nThreads, barrier, g);
    NativeParallelFor(nThreads, body);
}

int TestMain() { 
    if( MinThread<1 ) {
        REPORT("number of threads must be positive\n");
        exit(1);
    }
    for( int p=MinThread; p<=MaxThread; ++p ) {
       tbb::task_scheduler_init init(p);
       test_wait_count();
       test_run();
       test_iterator();
       test_parallel(p);
   }
   return Harness::Done;
}

