/*
 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <cassert>
#include <numeric>

#include "base/cast.hh"
#include "base/stl_helpers.hh"
#include "mem/ruby/buffers/MessageBuffer.hh"
#include "mem/ruby/common/NetDest.hh"
#include "mem/ruby/network/BasicLink.hh"
#include "mem/ruby/network/simple/SimpleLink.hh"
#include "mem/ruby/network/simple/SimpleNetwork.hh"
#include "mem/ruby/network/simple/Switch.hh"
#include "mem/ruby/network/simple/Throttle.hh"
#include "mem/ruby/network/Topology.hh"
#include "mem/ruby/profiler/Profiler.hh"
#include "mem/ruby/system/System.hh"

using namespace std;
using m5::stl_helpers::deletePointers;

SimpleNetwork::SimpleNetwork(const Params *p)
    : Network(p)
{
    m_buffer_size = p->buffer_size;
    m_endpoint_bandwidth = p->endpoint_bandwidth;
    m_adaptive_routing = p->adaptive_routing;

    // Note: the parent Network Object constructor is called before the
    // SimpleNetwork child constructor.  Therefore, the member variables
    // used below should already be initialized.

    m_endpoint_switches.resize(m_nodes);

    m_in_use.resize(m_virtual_networks);
    m_ordered.resize(m_virtual_networks);
    for (int i = 0; i < m_virtual_networks; i++) {
        m_in_use[i] = false;
        m_ordered[i] = false;
    }

    // Allocate to and from queues
    m_toNetQueues.resize(m_nodes);
    m_fromNetQueues.resize(m_nodes);
    for (int node = 0; node < m_nodes; node++) {
        m_toNetQueues[node].resize(m_virtual_networks);
        m_fromNetQueues[node].resize(m_virtual_networks);
        for (int j = 0; j < m_virtual_networks; j++) {
            m_toNetQueues[node][j] =
                new MessageBuffer(csprintf("toNet node %d j %d", node, j));
            m_fromNetQueues[node][j] =
                new MessageBuffer(csprintf("fromNet node %d j %d", node, j));
        }
    }

    // record the routers
    for (vector<BasicRouter*>::const_iterator i =
             m_topology_ptr->params()->routers.begin();
         i != m_topology_ptr->params()->routers.end(); ++i) {
        Switch* s = safe_cast<Switch*>(*i);
        m_switch_ptr_vector.push_back(s);
        s->init_net_ptr(this);
    }
}

void
SimpleNetwork::init()
{
    Network::init();

    // The topology pointer should have already been initialized in
    // the parent class network constructor.
    assert(m_topology_ptr != NULL);
    // false because this isn't a reconfiguration
    m_topology_ptr->createLinks(this, false);
}

void
SimpleNetwork::reset()
{
    for (int node = 0; node < m_nodes; node++) {
        for (int j = 0; j < m_virtual_networks; j++) {
            m_toNetQueues[node][j]->clear();
            m_fromNetQueues[node][j]->clear();
        }
    }

    for(int i = 0; i < m_switch_ptr_vector.size(); i++){
        m_switch_ptr_vector[i]->clearBuffers();
    }
}

SimpleNetwork::~SimpleNetwork()
{
    for (int i = 0; i < m_nodes; i++) {
        deletePointers(m_toNetQueues[i]);
        deletePointers(m_fromNetQueues[i]);
    }
    deletePointers(m_switch_ptr_vector);
    deletePointers(m_buffers_to_free);
    // delete m_topology_ptr;
}

// From a switch to an endpoint node
void
SimpleNetwork::makeOutLink(SwitchID src, NodeID dest, BasicLink* link, 
                           LinkDirection direction, 
                           const NetDest& routing_table_entry, 
                           bool isReconfiguration)
{
    assert(dest < m_nodes);
    assert(src < m_switch_ptr_vector.size());
    assert(m_switch_ptr_vector[src] != NULL);

    if (isReconfiguration) {
        m_switch_ptr_vector[src]->reconfigureOutPort(routing_table_entry);
        return;
    }

    SimpleExtLink *simple_link = safe_cast<SimpleExtLink*>(link);

    m_switch_ptr_vector[src]->addOutPort(m_fromNetQueues[dest],
                                         routing_table_entry,
                                         simple_link->m_latency,
                                         simple_link->m_bw_multiplier);

    m_endpoint_switches[dest] = m_switch_ptr_vector[src];
}

// From an endpoint node to a switch
void
SimpleNetwork::makeInLink(NodeID src, SwitchID dest, BasicLink* link, 
                          LinkDirection direction, 
                          const NetDest& routing_table_entry, 
                          bool isReconfiguration)
{
    assert(src < m_nodes);
    if (isReconfiguration) {
        // do nothing
        return;
    }

    m_switch_ptr_vector[dest]->addInPort(m_toNetQueues[src]);
}

// From a switch to a switch
void
SimpleNetwork::makeInternalLink(SwitchID src, SwitchID dest, BasicLink* link, 
                                LinkDirection direction, 
                                const NetDest& routing_table_entry,
                                bool isReconfiguration)
{
    if (isReconfiguration) {
        m_switch_ptr_vector[src]->reconfigureOutPort(routing_table_entry);
        return;
    }

    // Create a set of new MessageBuffers
    std::vector<MessageBuffer*> queues;
    for (int i = 0; i < m_virtual_networks; i++) {
        // allocate a buffer
        MessageBuffer* buffer_ptr = new MessageBuffer;
        buffer_ptr->setOrdering(true);
        if (m_buffer_size > 0) {
            buffer_ptr->resize(m_buffer_size);
        }
        queues.push_back(buffer_ptr);
        // remember to deallocate it
        m_buffers_to_free.push_back(buffer_ptr);
    }
    // Connect it to the two switches
    SimpleIntLink *simple_link = safe_cast<SimpleIntLink*>(link);

    m_switch_ptr_vector[dest]->addInPort(queues);
    m_switch_ptr_vector[src]->addOutPort(queues, routing_table_entry,
                                         simple_link->m_latency, 
                                         simple_link->m_bw_multiplier);
}

void
SimpleNetwork::checkNetworkAllocation(NodeID id, bool ordered, int network_num)
{
    assert(id < m_nodes);
    assert(network_num < m_virtual_networks);

    if (ordered) {
        m_ordered[network_num] = true;
    }
    m_in_use[network_num] = true;
}

MessageBuffer*
SimpleNetwork::getToNetQueue(NodeID id, bool ordered, int network_num,
                             std::string vnet_type)
{
    checkNetworkAllocation(id, ordered, network_num);
    return m_toNetQueues[id][network_num];
}

MessageBuffer*
SimpleNetwork::getFromNetQueue(NodeID id, bool ordered, int network_num,
                               std::string vnet_type)
{
    checkNetworkAllocation(id, ordered, network_num);
    return m_fromNetQueues[id][network_num];
}

const std::vector<Throttle*>*
SimpleNetwork::getThrottles(NodeID id) const
{
    assert(id >= 0);
    assert(id < m_nodes);
    assert(m_endpoint_switches[id] != NULL);
    return m_endpoint_switches[id]->getThrottles();
}

void
SimpleNetwork::printStats(ostream& out) const
{
    out << endl;
    out << "Network Stats" << endl;
    out << "-------------" << endl;
    out << endl;

    //
    // Determine total counts before printing out each switch's stats
    //
    std::vector<uint64> total_msg_counts;
    total_msg_counts.resize(MessageSizeType_NUM);
    for (MessageSizeType type = MessageSizeType_FIRST; 
         type < MessageSizeType_NUM; 
         ++type) {
        total_msg_counts[type] = 0;
    }
    
    for (int i = 0; i < m_switch_ptr_vector.size(); i++) {
        const std::vector<Throttle*>* throttles = 
            m_switch_ptr_vector[i]->getThrottles();
        
        for (int p = 0; p < throttles->size(); p++) {
            
            const std::vector<std::vector<int> >& message_counts = 
                ((*throttles)[p])->getCounters();
            
            for (MessageSizeType type = MessageSizeType_FIRST; 
                 type < MessageSizeType_NUM; 
                 ++type) {

                const std::vector<int> &mct = message_counts[type];
                int sum = accumulate(mct.begin(), mct.end(), 0);
                total_msg_counts[type] += uint64(sum);
            }
        }
    }
    uint64 total_msgs = 0;
    uint64 total_bytes = 0;
    for (MessageSizeType type = MessageSizeType_FIRST; 
         type < MessageSizeType_NUM; 
         ++type) {
        
        if (total_msg_counts[type] > 0) {
            out << "total_msg_count_" << type << ": " << total_msg_counts[type] 
                << " " << total_msg_counts[type] *
                uint64(MessageSizeType_to_int(type))
                << endl;
            
            total_msgs += total_msg_counts[type];
            
            total_bytes += total_msg_counts[type] * 
                uint64(MessageSizeType_to_int(type));
        }
    }
    
    out << "total_msgs: " << total_msgs 
        << " total_bytes: " << total_bytes << endl;
    
    out << endl;
    for (int i = 0; i < m_switch_ptr_vector.size(); i++) {
        m_switch_ptr_vector[i]->printStats(out);
    }
    m_topology_ptr->printStats(out);
}

void
SimpleNetwork::clearStats()
{
    for (int i = 0; i < m_switch_ptr_vector.size(); i++) {
        m_switch_ptr_vector[i]->clearStats();
    }
    m_topology_ptr->clearStats();
}

void
SimpleNetwork::print(ostream& out) const
{
    out << "[SimpleNetwork]";
}

SimpleNetwork *
SimpleNetworkParams::create()
{
    return new SimpleNetwork(this);
}

/*
 * The simple network has an array of switches. These switches have buffers
 * that need to be accessed for functional reads and writes. Also the links
 * between different switches have buffers that need to be accessed.
 */
bool
SimpleNetwork::functionalRead(Packet *pkt)
{
    for (unsigned int i = 0; i < m_switch_ptr_vector.size(); i++) {
        if (m_switch_ptr_vector[i]->functionalRead(pkt)) {
            return true;
        }
    }

    for (unsigned int i = 0; i < m_buffers_to_free.size(); ++i) {
        if (m_buffers_to_free[i]->functionalRead(pkt)) {
            return true;
        }
    }

    return false;
}

uint32_t
SimpleNetwork::functionalWrite(Packet *pkt)
{
    uint32_t num_functional_writes = 0;

    for (unsigned int i = 0; i < m_switch_ptr_vector.size(); i++) {
        num_functional_writes += m_switch_ptr_vector[i]->functionalWrite(pkt);
    }

    for (unsigned int i = 0; i < m_buffers_to_free.size(); ++i) {
        num_functional_writes += m_buffers_to_free[i]->functionalWrite(pkt);
    }
    return num_functional_writes;
}