/*
    Copyright (c) 2005-2020 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.
*/

#ifndef __TBBexample_graph_logicsim_oba_H
#define __TBBexample_graph_logicsim_oba_H 1

namespace P {
    //input ports 
    const int CI = 0;
    const int A0 = 1;
    const int B0 = 2;
    const int A1 = 3;
    const int B1 = 4;
    const int A2 = 5;
    const int B2 = 6;
    const int A3 = 7;
    const int B3 = 8;
    
    //output_ports
    const int S0 = 0;
    const int S1 = 1;
    const int S2 = 2;
    const int S3 = 3;

#if USE_TWO_BIT_FULL_ADDER
    const int CO = 2;
#else   
    const int CO = 4;
#endif
}

#include "basics.h"

class one_bit_adder : public composite_node< tuple< signal_t, signal_t, signal_t >, tuple< signal_t, signal_t > > {
    broadcast_node<signal_t> A_port;
    broadcast_node<signal_t> B_port;
    broadcast_node<signal_t> CI_port;
    xor_gate<2> FirstXOR;
    xor_gate<2> SecondXOR;
    and_gate<2> FirstAND;
    and_gate<2> SecondAND;
    or_gate<2> FirstOR;
    graph& my_graph;
    typedef composite_node< tuple< signal_t, signal_t, signal_t >, tuple< signal_t, signal_t > > base_type;

public:
    one_bit_adder(graph& g) : base_type(g), my_graph(g), A_port(g), B_port(g), CI_port(g), FirstXOR(g), 
                              SecondXOR(g), FirstAND(g), SecondAND(g), FirstOR(g) {
        make_connections();
        set_up_composite();
    }
    one_bit_adder(const one_bit_adder& src) : 
        base_type(src.my_graph), my_graph(src.my_graph), A_port(src.my_graph), B_port(src.my_graph), 
        CI_port(src.my_graph), FirstXOR(src.my_graph), SecondXOR(src.my_graph), 
        FirstAND(src.my_graph), SecondAND(src.my_graph), FirstOR(src.my_graph) 
    {
        make_connections();
        set_up_composite();
    }

    ~one_bit_adder() {}

private:
    void make_connections() {
  
        make_edge(A_port, input_port<0>(FirstXOR));
        make_edge(A_port, input_port<0>(FirstAND));
        make_edge(B_port, input_port<1>(FirstXOR));
        make_edge(B_port, input_port<1>(FirstAND));
        make_edge(CI_port, input_port<1>(SecondXOR));
        make_edge(CI_port, input_port<1>(SecondAND));
        make_edge(FirstXOR, input_port<0>(SecondXOR));
        make_edge(FirstXOR, input_port<0>(SecondAND));
        make_edge(SecondAND, input_port<0>(FirstOR));
        make_edge(FirstAND, input_port<1>(FirstOR));
    }

    void set_up_composite() {
        base_type::input_ports_type input_tuple(CI_port, A_port, B_port);
        base_type::output_ports_type output_tuple(output_port<0>(SecondXOR), output_port<0>(FirstOR));
        base_type::set_external_ports( input_tuple, output_tuple);
        base_type::add_visible_nodes(A_port, B_port, CI_port, FirstXOR, SecondXOR, FirstAND, SecondAND, FirstOR );
    }
};

#endif /* __TBBexample_graph_logicsim_oba_H */
