/*
    Copyright (c) 2005-2017 Intel Corporation

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.




*/

#include "harness.h"
#include "tbb/flow_graph.h"
#include "tbb/task_scheduler_init.h"
#include "tbb/tick_count.h"
#include "harness_graph.h"
#if TBB_PREVIEW_FLOW_GRAPH_FEATURES
#include <vector>
#include <algorithm>
#endif

#define N 1000
#define C 10

template< typename T >
void spin_try_get( tbb::flow::buffer_node<T> &b, T &value ) {
    while ( b.try_get(value) != true ) {}
}

template< typename T >
void check_item( T* count_value, T &value ) {
    count_value[value / N] += value % N;
}

template< typename T >
struct parallel_puts : NoAssign {

    tbb::flow::buffer_node<T> &my_b;

    parallel_puts( tbb::flow::buffer_node<T> &b ) : my_b(b) {}

    void operator()(int i) const {
        for (int j = 0; j < N; ++j) {
            bool msg = my_b.try_put( T(N*i + j) );
            ASSERT( msg == true, NULL );
        }
    }
};

template< typename T >
struct touches {

    bool **my_touches;
    int my_num_threads;

    touches( int num_threads ) : my_num_threads(num_threads) {
        my_touches = new bool* [my_num_threads];
        for ( int p = 0; p < my_num_threads; ++p) {
            my_touches[p] = new bool[N];
            for ( int n = 0; n < N; ++n)
                my_touches[p][n] = false;
        }
    }

    ~touches() {
        for ( int p = 0; p < my_num_threads; ++p) {
            delete [] my_touches[p];
        }
        delete [] my_touches;
    }

    bool check( T v ) {
        ASSERT ( my_touches[v/N][v%N] == false, NULL);
        my_touches[v/N][v%N] = true;
        return true;
    }

    bool validate_touches() {
        for ( int p = 0; p < my_num_threads; ++p) {
            for ( int n = 0; n < N; ++n) {
                ASSERT ( my_touches[p][n] == true, NULL);
            }
        }
        return true;
    }
};

template< typename T >
struct parallel_gets : NoAssign {

    tbb::flow::buffer_node<T> &my_b;
    touches<T> &my_touches;

    parallel_gets( tbb::flow::buffer_node<T> &b, touches<T> &t) : my_b(b), my_touches(t) {}

    void operator()(int) const {
        for (int j = 0; j < N; ++j) {
            T v;
            spin_try_get( my_b, v );
            my_touches.check( v );
        }
    }

};

template< typename T >
struct parallel_put_get : NoAssign {

    tbb::flow::buffer_node<T> &my_b;
    touches<T> &my_touches;

    parallel_put_get( tbb::flow::buffer_node<T> &b, touches<T> &t ) : my_b(b), my_touches(t) {}

    void operator()(int tid) const {

        for ( int i = 0; i < N; i+=C ) {
            int j_end = ( N < i + C ) ? N : i + C;
            // dump about C values into the buffer
            for ( int j = i; j < j_end; ++j ) {
                ASSERT( my_b.try_put( T (N*tid + j ) ) == true, NULL );
            }
            // receiver about C values from the buffer
            for ( int j = i; j < j_end; ++j ) {
                T v;
                spin_try_get( my_b, v );
                my_touches.check( v );
            }
        }
    }

};

//
// Tests
//
// Item can be reserved, released, consumed ( single serial receiver )
//
template< typename T >
int test_reservation() {
    tbb::flow::graph g;
    T bogus_value(-1);

    // Simple tests
    tbb::flow::buffer_node<T> b(g);

    b.try_put(T(1));
    b.try_put(T(2));
    b.try_put(T(3));

    T v, vsum;
    ASSERT( b.try_reserve(v) == true, NULL );
    ASSERT( b.try_release() == true, NULL );
    v = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_reserve(v) == true, NULL );
    ASSERT( b.try_consume() == true, NULL );
    vsum += v;
    v = bogus_value;
    g.wait_for_all();

    ASSERT( b.try_get(v) == true, NULL );
    vsum += v;
    v = bogus_value;
    g.wait_for_all();

    ASSERT( b.try_reserve(v) == true, NULL );
    ASSERT( b.try_release() == true, NULL );
    v = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_reserve(v) == true, NULL );
    ASSERT( b.try_consume() == true, NULL );
    vsum += v;
    ASSERT( vsum == T(6), NULL);
    v = bogus_value;
    g.wait_for_all();

    return 0;
}

//
// Tests
//
// multilpe parallel senders, items in arbitrary order
// multilpe parallel senders, multiple parallel receivers, items in arbitrary order and all items received
//   * overlapped puts / gets
//   * all puts finished before any getS
//
template< typename T >
int test_parallel(int num_threads) {
    tbb::flow::graph g;
    tbb::flow::buffer_node<T> b(g);
    tbb::flow::buffer_node<T> b2(g);
    tbb::flow::buffer_node<T> b3(g);
    T bogus_value(-1);
    T j = bogus_value;

    NativeParallelFor( num_threads, parallel_puts<T>(b) );

    T *next_value = new T[num_threads];
    for (int tid = 0; tid < num_threads; ++tid) next_value[tid] = T(0);

    for (int i = 0; i < num_threads * N; ++i ) {
        spin_try_get( b, j );
        check_item( next_value, j );
        j = bogus_value;
    }
    for (int tid = 0; tid < num_threads; ++tid)  {
        ASSERT( next_value[tid] == T((N*(N-1))/2), NULL );
    }

    j = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    NativeParallelFor( num_threads, parallel_puts<T>(b) );

    {
        touches< T > t( num_threads );
        NativeParallelFor( num_threads, parallel_gets<T>(b, t) );
        g.wait_for_all();
        ASSERT( t.validate_touches(), NULL );
    }
    j = bogus_value;
    ASSERT( b.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    g.wait_for_all();
    {
        touches< T > t( num_threads );
        NativeParallelFor( num_threads, parallel_put_get<T>(b, t) );
        g.wait_for_all();
        ASSERT( t.validate_touches(), NULL );
    }
    j = bogus_value;
    ASSERT( b.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::make_edge( b, b2 );
    tbb::flow::make_edge( b2, b3 );

    NativeParallelFor( num_threads, parallel_puts<T>(b) );
    {
        touches< T > t( num_threads );
        NativeParallelFor( num_threads, parallel_gets<T>(b3, t) );
        g.wait_for_all();
        ASSERT( t.validate_touches(), NULL );
    }
    j = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( b2.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( b3.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    // test copy constructor
    ASSERT( b.remove_successor( b2 ), NULL );
    // fill up b:
    NativeParallelFor( num_threads, parallel_puts<T>(b) );
    // copy b:
    tbb::flow::buffer_node<T> b_copy(b);

    // b_copy should be empty
    j = bogus_value;
    g.wait_for_all();
    ASSERT( b_copy.try_get( j ) == false, NULL );

    // hook them together:
    ASSERT( b.register_successor(b_copy) == true, NULL );
    // try to get content from b_copy
    {
        touches< T > t( num_threads );
        NativeParallelFor( num_threads, parallel_gets<T>(b_copy, t) );
        g.wait_for_all();
        ASSERT( t.validate_touches(), NULL );
    }
    // now both should be empty
    j = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( b_copy.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    delete [] next_value;
    return 0;
}

//
// Tests
//
// Predecessors cannot be registered
// Empty buffer rejects item requests
// Single serial sender, items in arbitrary order
// Chained buffers ( 2 & 3 ), single sender, items at last buffer in arbitrary order
//

template< typename T >
int test_serial() {
    tbb::flow::graph g;
    T bogus_value(-1);

    tbb::flow::buffer_node<T> b(g);
    tbb::flow::buffer_node<T> b2(g);
    T j = bogus_value;

    //
    // Rejects attempts to add / remove predecessor
    // Rejects request from empty buffer
    //
    ASSERT( b.register_predecessor( b2 ) == false, NULL );
    ASSERT( b.remove_predecessor( b2 ) == false, NULL );
    ASSERT( b.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    //
    // Simple puts and gets
    //

    for (int i = 0; i < N; ++i) {
        bool msg = b.try_put( T(i) );
        ASSERT( msg == true, NULL );
    }

    T vsum = T(0);
    for (int i = 0; i < N; ++i) {
        j = bogus_value;
        spin_try_get( b, j );
        vsum += j;
    }
    ASSERT( vsum == (N*(N-1))/2, NULL);
    j = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::make_edge(b, b2);
#if TBB_PREVIEW_FLOW_GRAPH_FEATURES
    ASSERT( b.successor_count() == 1, NULL);
    ASSERT( b.predecessor_count() == 0, NULL);
    ASSERT( b2.successor_count() == 0, NULL);
    ASSERT( b2.predecessor_count() == 1, NULL);
    typename tbb::flow::buffer_node<T>::successor_list_type my_succs;
    b.copy_successors(my_succs);
    ASSERT(my_succs.size() == 1, NULL);
    typename tbb::flow::buffer_node<T>::predecessor_list_type my_preds;
    b.copy_predecessors(my_preds);
    ASSERT(my_preds.size() == 0, NULL);
#endif

    vsum = T(0);
    for (int i = 0; i < N; ++i) {
        bool msg = b.try_put( T(i) );
        ASSERT( msg == true, NULL );
    }

    for (int i = 0; i < N; ++i) {
        j = bogus_value;
        spin_try_get( b2, j );
        vsum += j;
    }
    ASSERT( vsum == (N*(N-1))/2, NULL);
    j = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( b2.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::remove_edge(b, b2);
    ASSERT( b.try_put( 1 ) == true, NULL );
    g.wait_for_all();
    ASSERT( b2.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    g.wait_for_all();
    ASSERT( b.try_get( j ) == true, NULL );
    ASSERT( j == 1, NULL );

    tbb::flow::buffer_node<T> b3(g);
    tbb::flow::make_edge( b, b2 );
    tbb::flow::make_edge( b2, b3 );

    vsum = T(0);
    for (int i = 0; i < N; ++i) {
        bool msg = b.try_put( T(i) );
        ASSERT( msg == true, NULL );
    }

    for (int i = 0; i < N; ++i) {
        j = bogus_value;
        spin_try_get( b3, j );
        vsum += j;
    }
    ASSERT( vsum == (N*(N-1))/2, NULL);
    j = bogus_value;
    g.wait_for_all();
    ASSERT( b.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( b2.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( b3.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::remove_edge(b, b2);
    ASSERT( b.try_put( 1 ) == true, NULL );
    g.wait_for_all();
    ASSERT( b2.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    g.wait_for_all();
    ASSERT( b3.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    g.wait_for_all();
    ASSERT( b.try_get( j ) == true, NULL );
    ASSERT( j == 1, NULL );

    return 0;
}

int TestMain() {
    tbb::tick_count start = tbb::tick_count::now(), stop;
    for (int p = 2; p <= 4; ++p) {
        tbb::task_scheduler_init init(p);
        test_serial<int>();
        test_parallel<int>(p);
    }
    stop = tbb::tick_count::now();
    REMARK("Buffer_Node Time=%6.6f\n", (stop-start).seconds());
    test_resets<int,tbb::flow::buffer_node<int> >();
    test_resets<float,tbb::flow::buffer_node<float> >();
#if TBB_PREVIEW_FLOW_GRAPH_FEATURES
    test_buffer_extract<tbb::flow::buffer_node<int> >().run_tests();
#endif
    return Harness::Done;
}
