/**
 * Copyright © 2016 IBM 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.
 */
#include <iostream>
#include <exception>
#include "manager.hpp"

namespace phosphor
{
namespace inventory
{
namespace manager
{
namespace details
{

/** @brief Fowrarding signal callback.
 *
 *  Extracts per-signal specific context and forwards the call to the manager
 *  instance.
 */
auto _signal(sd_bus_message* m, void* data, sd_bus_error* e) noexcept
{
    try
    {
        auto msg = sdbusplus::message::message(m);
        auto& args = *static_cast<Manager::SigArg*>(data);
        sd_bus_message_ref(m);
        auto& mgr = *std::get<0>(args);
        mgr.signal(
            msg,
            static_cast<const details::DbusSignal&>(
                *std::get<1>(args)),
            *std::get<2>(args));
    }
    catch (const std::exception& e)
    {
        std::cerr << e.what() << std::endl;
    }

    return 0;
}

} // namespace details

Manager::Manager(
    sdbusplus::bus::bus&& bus,
    const char* busname,
    const char* root,
    const char* iface) :
    details::ServerObject<details::ManagerIface>(bus, root),
    _shutdown(false),
    _root(root),
    _bus(std::move(bus)),
    _manager(sdbusplus::server::manager::manager(_bus, root))
{
    for (auto& group : _events)
    {
        for (auto pEvent : std::get<0>(group))
        {
            if (pEvent->type !=
                details::Event::Type::DBUS_SIGNAL)
            {
                continue;
            }

            // Create a callback context for this event group.
            auto dbusEvent = static_cast<details::DbusSignal*>(
                                 pEvent.get());

            // Go ahead and store an iterator pointing at
            // the event data to avoid lookups later since
            // additional signal callbacks aren't added
            // after the manager is constructed.
            _sigargs.emplace_back(
                std::make_unique<SigArg>(
                    this,
                    dbusEvent,
                    &group));

            // Register our callback and the context for
            // each signal event.
            _matches.emplace_back(
                _bus,
                std::get<0>(*dbusEvent),
                details::_signal,
                _sigargs.back().get());
        }
    }

    _bus.request_name(busname);
}

void Manager::shutdown() noexcept
{
    _shutdown = true;
}

void Manager::run() noexcept
{
    while (!_shutdown)
    {
        try
        {
            _bus.process_discard();
            _bus.wait(5000000);
        }
        catch (const std::exception& e)
        {
            std::cerr << e.what() << std::endl;
        }
    }
}

void Manager::notify(std::string path, Object object)
{
    try
    {
        if (object.cbegin() == object.cend())
            throw std::runtime_error(
                "No interfaces in " + path);

        path.insert(0, _root);

        auto obj = _refs.find(path);
        if (obj != _refs.end())
            throw std::runtime_error(
                obj->first + " already exists");

        // Create an interface holder for each interface
        // provided by the client and group them into
        // a container.
        InterfaceComposite ref;

        for (auto& x : object)
        {
            auto maker = _makers.find(x.first.c_str());

            if (maker == _makers.end())
                throw std::runtime_error(
                    "Unimplemented interface: " + x.first);

            ref.emplace(x.first,
                        (maker->second)(_bus, path.c_str()));
        }

        // Hang on to a reference to the object (interfaces)
        // so it stays on the bus, and so we can make calls
        // to it if needed.
        _refs.emplace(
            path, std::move(ref));
    }
    catch (const std::exception& e)
    {
        std::cerr << e.what() << std::endl;
    }
}

void Manager::signal(
    sdbusplus::message::message& msg,
    const details::DbusSignal& event,
    const EventInfo& info)
{
    auto& filter = *std::get<1>(event);
    auto& actions = std::get<1>(info);

    if (filter(msg, *this))
    {
        for (auto& action : actions)
        {
            (*action)(*this);
        }
    }
}

void Manager::destroyObject(const char* path)
{
    std::string p{path};
    _refs.erase(_root + p);
}

details::holder::Base& Manager::getInterfaceHolder(
    const char* path, const char* interface)
{
    return const_cast<const Manager*>(
               this)->getInterfaceHolder(path, interface);
}

details::holder::Base& Manager::getInterfaceHolder(
    const char* path, const char* interface) const
{
    std::string p{path};
    auto oit = _refs.find(_root + p);
    if (oit == _refs.end())
        throw std::runtime_error(
            _root + p + " was not found");

    auto& obj = oit->second;
    auto iit = obj.find(interface);
    if (iit == obj.end())
        throw std::runtime_error(
            "interface was not found");

    return *iit->second;
}

} // namespace manager
} // namespace inventory
} // namespace phosphor

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