/*
 * Copyright (c) 2006 The Regents of The University of Michigan
 * 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.
 *
 * Authors: Nathan Binkert
 */

#include <Python.h>

#include <string>

#include "base/inifile.hh"
#include "base/output.hh"
#include "config/the_isa.hh"

#if THE_ISA != NULL_ISA
#include "dev/net/etherdevice.hh"
#include "dev/net/etherobject.hh"

#endif
#include "python/swig/pyobject.hh"

#include "mem/mem_object.hh"
#include "mem/ruby/slicc_interface/AbstractController.hh"
#include "sim/full_system.hh"
#include "sim/sim_object.hh"

using namespace std;

#if THE_ISA != NULL_ISA
EtherInt *
lookupEthPort(SimObject *so, const std::string &name, int i)
{
    EtherObject *eo = dynamic_cast<EtherObject *>(so);
    EtherDevice *ed = dynamic_cast<EtherDevice *>(so);
    if (eo == NULL && ed == NULL) {
        warn("error casting SimObject %s", so->name());
        return NULL;
    }

    EtherInt *p = NULL;
    if (eo)
        p = eo->getEthPort(name, i);
    else
        p = ed->getEthPort(name, i);
    return p;
}
#endif

/**
 * Connect the described MemObject ports.  Called from Python via SWIG.
 * The indices i1 & i2 will be -1 for regular ports, >= 0 for vector ports.
 * SimObject1 is the master, and SimObject2 is the slave
 */
int
connectPorts(SimObject *o1, const std::string &name1, int i1,
             SimObject *o2, const std::string &name2, int i2)
{
#if THE_ISA != NULL_ISA
    EtherObject *eo1, *eo2;
    EtherDevice *ed1, *ed2;
    eo1 = dynamic_cast<EtherObject*>(o1);
    ed1 = dynamic_cast<EtherDevice*>(o1);
    eo2 = dynamic_cast<EtherObject*>(o2);
    ed2 = dynamic_cast<EtherDevice*>(o2);

    if ((eo1 || ed1) && (eo2 || ed2)) {
        EtherInt *p1 = lookupEthPort(o1, name1, i1);
        EtherInt *p2 = lookupEthPort(o2, name2, i2);

        if (p1 != NULL &&  p2 != NULL) {

            p1->setPeer(p2);
            p2->setPeer(p1);

            return 1;
        }
    }
#endif

    // These could be MessageBuffers from the ruby memory system. If so, they
    // need not be connected to anything currently.
    MessageBuffer *mb1, *mb2;
    mb1 = dynamic_cast<MessageBuffer*>(o1);
    mb2 = dynamic_cast<MessageBuffer*>(o2);

    if (mb1 || mb2) {
        // No need to connect anything here currently. MessageBuffer
        // connections in Python only serve to print the connections in
        // the config output.
        // TODO: Add real ports to MessageBuffers and use MemObject connect
        // code below to bind MessageBuffer senders and receivers
        return 1;
    }

    MemObject *mo1, *mo2;
    mo1 = dynamic_cast<MemObject*>(o1);
    mo2 = dynamic_cast<MemObject*>(o2);

    if (mo1 == NULL || mo2 == NULL) {
        panic ("Error casting SimObjects %s and %s to MemObject", o1->name(),
               o2->name());
    }

    // generic master/slave port connection
    BaseMasterPort& masterPort = mo1->getMasterPort(name1, i1);
    BaseSlavePort& slavePort   = mo2->getSlavePort(name2, i2);

    masterPort.bind(slavePort);

    return 1;
}

inline IniFile &
inifile()
{
    static IniFile inifile;
    return inifile;
}

/**
 * Convert a pointer to the Python object that SWIG wraps around a C++
 * SimObject pointer back to the actual C++ pointer.  See main.i.
 */
extern "C" SimObject *convertSwigSimObjectPtr(PyObject *);

// Python.h is notoriously not const-correct (for 2.4, anyway)... make
// a little define here to reduce the noise and make it easier to
// #ifdef away if Python.h gets fixed.  Note there are a couple of
// these in sim/main.cc as well that are handled without this define.
#define PCC(s)  const_cast<char *>(s)

/** Single instance of PythonSimObjectResolver as its action is effectively
 *  static but SimObjectResolver can use a non-persistent object */
PythonSimObjectResolver pythonSimObjectResolver;

SimObject *
PythonSimObjectResolver::resolveSimObject(const string &name)
{
    PyObject *module = PyImport_ImportModule(PCC("m5.SimObject"));
    if (module == NULL)
        panic("Could not import m5.SimObject");

    PyObject *resolver =
        PyObject_GetAttrString(module, PCC("resolveSimObject"));
    if (resolver == NULL) {
        PyErr_Print();
        panic("resolveSimObject: failed to find resolveSimObject");
    }

    PyObject *ptr = PyObject_CallFunction(resolver, PCC("(s)"), name.c_str());
    if (ptr == NULL) {
        PyErr_Print();
        panic("resolveSimObject: failure on call to Python for %s", name);
    }

    SimObject *obj = convertSwigSimObjectPtr(ptr);
    if (obj == NULL)
        panic("resolveSimObject: failure on pointer conversion for %s", name);

    Py_DECREF(module);
    Py_DECREF(resolver);
    Py_DECREF(ptr);

    return obj;
}

CheckpointIn *
getCheckpoint(const std::string &cpt_dir)
{
    return new CheckpointIn(cpt_dir, pythonSimObjectResolver);
}