/*
 * Copyright 2018 Google, Inc.
 *
 * 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: Gabe Black
 */

#include "systemc/core/object.hh"

#include <algorithm>

#include "base/logging.hh"
#include "systemc/core/module.hh"
#include "systemc/core/scheduler.hh"

namespace sc_gem5
{

namespace
{

ObjectsIt
findObjectIn(Objects &objects, const std::string &name)
{
    ObjectsIt it;
    for (it = objects.begin(); it != objects.end(); it++)
        if (!strcmp((*it)->name(), name.c_str()))
            break;

    return it;
}

void
addObject(Objects *objects, sc_core::sc_object *object)
{
    objects->emplace(objects->end(), object);
}

void
popObject(Objects *objects, const std::string &name)
{
    ObjectsIt it = findObjectIn(*objects, name);
    assert(it != objects->end());
    std::swap(objects->back(), *it);
    objects->pop_back();
}

} // anonymous namespace

Object::Object(sc_core::sc_object *_sc_obj) : Object(_sc_obj, "object") {}

Object::Object(sc_core::sc_object *_sc_obj, const char *obj_name) :
    _sc_obj(_sc_obj), _basename(obj_name ? obj_name : ""), parent(nullptr)
{
    if (_basename == "")
        _basename = "object";

    Module *p = currentModule();
    if (!p)
        p = callbackModule();

    Module *n = newModule();
    if (n) {
        // We are a module in the process of being constructed.
        n->finish(this);
    }

    if (p) {
        // We're "within" a parent module, ie we're being created while its
        // constructor or end_of_elaboration callback is running.
        parent = p->obj()->_sc_obj;
        addObject(&parent->_gem5_object->children, _sc_obj);
    } else if (scheduler.current()) {
        // Our parent is the currently running process.
        parent = scheduler.current();
    } else {
        // We're a top level object.
        addObject(&topLevelObjects, _sc_obj);
    }

    addObject(&allObjects, _sc_obj);

    _name = _basename;
    sc_core::sc_object *sc_p = parent;
    while (sc_p) {
        _name = std::string(sc_p->basename()) + std::string(".") + _name;
        sc_p = sc_p->get_parent_object();
    }
}

Object::Object(sc_core::sc_object *_sc_obj, const Object &arg) :
    Object(_sc_obj, arg._basename.c_str())
{}

Object &
Object::operator = (const Object &)
{
    return *this;
}

Object::~Object()
{
    // Promote all children to be top level objects.
    for (auto child: children) {
        addObject(&topLevelObjects, child);
        child->_gem5_object->parent = nullptr;
    }
    children.clear();

    if (parent)
        popObject(&parent->_gem5_object->children, _name);
    else
        popObject(&topLevelObjects, _name);
    popObject(&allObjects, _name);
}

const char *
Object::name() const
{
    return _name.c_str();
}

const char *
Object::basename() const
{
    return _basename.c_str();
}

void
Object::print(std::ostream &out) const
{
    out << name();
}

void
Object::dump(std::ostream &out) const
{
    out << "name = " << name() << "\n";
    out << "kind = " << _sc_obj->kind() << "\n";
}

const std::vector<sc_core::sc_object *> &
Object::get_child_objects() const
{
    return children;
}

const std::vector<sc_core::sc_event *> &
Object::get_child_events() const
{
    return events;
}

sc_core::sc_object *Object::get_parent_object() const
{
    return parent;
}

bool
Object::add_attribute(sc_core::sc_attr_base &attr)
{
    return cltn.push_back(&attr);
}

sc_core::sc_attr_base *
Object::get_attribute(const std::string &attr)
{
    return cltn[attr];
}

sc_core::sc_attr_base *
Object::remove_attribute(const std::string &attr)
{
    return cltn.remove(attr);
}

void
Object::remove_all_attributes()
{
    cltn.remove_all();
}

int
Object::num_attributes() const
{
    return cltn.size();
}

sc_core::sc_attr_cltn &
Object::attr_cltn()
{
    return cltn;
}

const sc_core::sc_attr_cltn &
Object::attr_cltn() const
{
    return cltn;
}

sc_core::sc_simcontext *
Object::simcontext() const
{
    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
    return nullptr;
}

EventsIt
Object::addChildEvent(sc_core::sc_event *e)
{
    return events.emplace(events.end(), e);
}

void
Object::delChildEvent(sc_core::sc_event *e)
{
    EventsIt it = std::find(events.begin(), events.end(), e);
    assert(it != events.end());
    std::swap(*it, events.back());
    events.pop_back();
}


Objects topLevelObjects;
Objects allObjects;

const std::vector<sc_core::sc_object *> &
getTopLevelScObjects()
{
    return topLevelObjects;
}

sc_core::sc_object *
findObject(const char *name, const Objects &objects)
{
    ObjectsIt it = findObjectIn(allObjects, name);
    return it == allObjects.end() ? nullptr : *it;
}

} // namespace sc_gem5