/*
    Copyright 2005-2013 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.
*/

// TO DO: Add overlapping put / receive tests

#include "tbb/flow_graph.h"
#include "tbb/task_scheduler_init.h"
#include "tbb/tick_count.h"
#include "harness.h"

#include <cstdio>

#define N 10
#define C 10

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

template< typename T >
void check_item( T* next_value, T &value ) {
    int tid = value / N;
    int offset = value % N;
    ASSERT( next_value[tid] == T(offset), NULL );
    ++next_value[tid];
}

template< typename T >
struct parallel_puts : NoAssign {
    tbb::flow::priority_queue_node<T> &my_q;
    parallel_puts( tbb::flow::priority_queue_node<T> &q ) : my_q(q) {}
    void operator()(int i) const {
        for (int j = 0; j < N; ++j) {
            bool msg = my_q.try_put( T(N*i + j) );
            ASSERT( msg == true, NULL );
        }
    }
};

template< typename T >
struct parallel_gets : NoAssign {
    tbb::flow::priority_queue_node<T> &my_q;
    parallel_gets( tbb::flow::priority_queue_node<T> &q) : my_q(q) {}
    void operator()(int) const {
        T prev;
        spin_try_get( my_q, prev );
        for (int j = 0; j < N-1; ++j) {
            T v;
            spin_try_get( my_q, v );
            ASSERT(v < prev, NULL);
        }
    }
};

template< typename T >
struct parallel_put_get : NoAssign {
    tbb::flow::priority_queue_node<T> &my_q;
    parallel_put_get( tbb::flow::priority_queue_node<T> &q ) : my_q(q) {}
    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 Q
            for ( int j = i; j < j_end; ++j ) {
                ASSERT( my_q.try_put( T (N*tid + j ) ) == true, NULL );
            }
            // receive about C values from the Q
            for ( int j = i; j < j_end; ++j ) {
                T v;
                spin_try_get( my_q, v );
            }
        }
    }
};

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

    // Simple tests
    tbb::flow::priority_queue_node<T> q(g);

    q.try_put(T(1));
    q.try_put(T(2));
    q.try_put(T(3));
    g.wait_for_all();

    T v=bogus_value, w=bogus_value;
    ASSERT( q.try_reserve(v) == true, NULL );
    ASSERT( v == T(3), NULL ); 
    ASSERT( q.try_release() == true, NULL );
    v = bogus_value;
    g.wait_for_all();
    ASSERT( q.try_reserve(v) == true, NULL );
    ASSERT( v == T(3), NULL ); 
    ASSERT( q.try_consume() == true, NULL );
    v = bogus_value;
    g.wait_for_all();
 
    ASSERT( q.try_get(v) == true, NULL );
    ASSERT( v == T(2), NULL ); 
    v = bogus_value;
    g.wait_for_all();
    
    ASSERT( q.try_reserve(v) == true, NULL );
    ASSERT( v == T(1), NULL ); 
    ASSERT( q.try_reserve(w) == false, NULL );
    ASSERT( w == bogus_value, NULL );
    ASSERT( q.try_get(w) == false, NULL );
    ASSERT( w == bogus_value, NULL );
    ASSERT( q.try_release() == true, NULL );
    v = bogus_value;
    g.wait_for_all();
    ASSERT( q.try_reserve(v) == true, NULL );
    ASSERT( v == T(1), NULL ); 
    ASSERT( q.try_consume() == true, NULL );
    v = bogus_value;
    g.wait_for_all();
    ASSERT( q.try_get(v) == false, NULL );
    return 0;
}

//
// Tests
//
// multilpe parallel senders, items in FIFO (relatively to sender) order
// multilpe parallel senders, multiple parallel receivers, items in FIFO order (relative to sender/receiver) 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::priority_queue_node<T> q(g);
    tbb::flow::priority_queue_node<T> q2(g);
    tbb::flow::priority_queue_node<T> q3(g);
    T bogus_value(-1);
    T j = bogus_value;

    NativeParallelFor( num_threads, parallel_puts<T>(q) );
    for (int i = num_threads*N -1; i>=0; --i) {
        spin_try_get( q, j );
        ASSERT(j == i, NULL);
        j = bogus_value;
    }
    g.wait_for_all();
    ASSERT( q.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    NativeParallelFor( num_threads, parallel_puts<T>(q) );
    g.wait_for_all();
    NativeParallelFor( num_threads, parallel_gets<T>(q) );
    g.wait_for_all();
    j = bogus_value;
    ASSERT( q.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    NativeParallelFor( num_threads, parallel_put_get<T>(q) );
    g.wait_for_all();
    j = bogus_value;
    ASSERT( q.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::make_edge( q, q2 );
    tbb::flow::make_edge( q2, q3 );
    NativeParallelFor( num_threads, parallel_puts<T>(q) );
    g.wait_for_all();
    NativeParallelFor( num_threads, parallel_gets<T>(q3) );
    g.wait_for_all();
    j = bogus_value;
    ASSERT( q.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    ASSERT( q2.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    ASSERT( q3.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    // test copy constructor
    ASSERT( q.remove_successor( q2 ) == true, NULL );
    NativeParallelFor( num_threads, parallel_puts<T>(q) );
    tbb::flow::priority_queue_node<T> q_copy(q);
    g.wait_for_all();
    j = bogus_value;
    ASSERT( q_copy.try_get( j ) == false, NULL );
    ASSERT( q.register_successor( q_copy ) == true, NULL );
    for (int i = num_threads*N -1; i>=0; --i) {
        spin_try_get( q_copy, j );
        ASSERT(j == i, NULL);
        j = bogus_value;
    }
    g.wait_for_all();
    ASSERT( q.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    ASSERT( q_copy.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    return 0;
}

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

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

    tbb::flow::priority_queue_node<T> q(g);
    tbb::flow::priority_queue_node<T> q2(g);
    T j = bogus_value;

    //
    // Rejects attempts to add / remove predecessor
    // Rejects request from empty Q
    //
    ASSERT( q.register_predecessor( q2 ) == false, NULL );
    ASSERT( q.remove_predecessor( q2 ) == false, NULL );
    ASSERT( q.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    //
    // Simple puts and gets
    //

    for (int i = 0; i < N; ++i)
        ASSERT( q.try_put( T(i) ), NULL );
    for (int i = N-1; i >=0; --i) {
        j = bogus_value;
        spin_try_get( q, j );
        ASSERT( i == j, NULL );
    }
    j = bogus_value;
    g.wait_for_all();
    ASSERT( q.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::make_edge( q, q2 );

    for (int i = 0; i < N; ++i)
        ASSERT( q.try_put( T(i) ), NULL );
    g.wait_for_all();
    for (int i = N-1; i >= 0; --i) {
        j = bogus_value;
        spin_try_get( q2, j );
        ASSERT( i == j, NULL );
    }
    j = bogus_value;
    g.wait_for_all();
    ASSERT( q.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( q2.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::remove_edge( q, q2 );
    ASSERT( q.try_put( 1 ) == true, NULL );
    g.wait_for_all();
    ASSERT( q2.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    g.wait_for_all();
    ASSERT( q.try_get( j ) == true, NULL );
    ASSERT( j == 1, NULL );

    tbb::flow::priority_queue_node<T> q3(g);
    tbb::flow::make_edge( q, q2 );
    tbb::flow::make_edge( q2, q3 );

    for (int i = 0; i < N; ++i)
        ASSERT(  q.try_put( T(i) ), NULL );
    g.wait_for_all();
    for (int i = N-1; i >= 0; --i) {
        j = bogus_value;
        spin_try_get( q3, j );
        ASSERT( i == j, NULL );
    }
    j = bogus_value;
    g.wait_for_all();
    ASSERT( q.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( q2.try_get( j ) == false, NULL );
    g.wait_for_all();
    ASSERT( q3.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );

    tbb::flow::remove_edge( q,  q2 );
    ASSERT( q.try_put( 1 ) == true, NULL );
    g.wait_for_all();
    ASSERT( q2.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    g.wait_for_all();
    ASSERT( q3.try_get( j ) == false, NULL );
    ASSERT( j == bogus_value, NULL );
    g.wait_for_all();
    ASSERT( q.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 = 1; p < 4; ++p) {
        tbb::task_scheduler_init init(p);
        test_serial<int>();
        test_reservation<int>(p);
        test_parallel<int>(p);
    } 
    stop = tbb::tick_count::now();
    REMARK("Priority_Queue_Node Time=%6.6f\n", (stop-start).seconds());
    return Harness::Done;
}
