/**
 * Copyright © 2021 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 "net_target_increase.hpp"

#include "../manager.hpp"
#include "../zone.hpp"
#include "action.hpp"
#include "group.hpp"

#include <fmt/format.h>

#include <nlohmann/json.hpp>
#include <phosphor-logging/log.hpp>

#include <algorithm>
#include <variant>

namespace phosphor::fan::control::json
{

using json = nlohmann::json;
using namespace phosphor::logging;

NetTargetIncrease::NetTargetIncrease(const json& jsonObj,
                                     const std::vector<Group>& groups) :
    ActionBase(jsonObj, groups)
{
    setState(jsonObj);
    setDelta(jsonObj);
}

void NetTargetIncrease::run(Zone& zone)
{
    if (!_stateParameter.empty())
    {
        auto s = Manager::getParameter(_stateParameter);
        if (!s)
        {
            return;
        }
        _state = *s;
    }

    auto netDelta = zone.getIncDelta();
    for (const auto& group : _groups)
    {
        const auto& members = group.getMembers();
        std::for_each(members.begin(), members.end(),
                      [this, &zone, &group, &netDelta](const auto& member) {
            try
            {
                auto value = Manager::getObjValueVariant(
                    member, group.getInterface(), group.getProperty());
                if (std::holds_alternative<int64_t>(value) ||
                    std::holds_alternative<double>(value))
                {
                    // Where a group of int/doubles are greater than or
                    // equal to the state(some value) provided, request an
                    // increase of the configured delta times the difference
                    // between the group member's value and configured state
                    // value.
                    if (value >= _state)
                    {
                        uint64_t incDelta = 0;
                        if (auto dblPtr = std::get_if<double>(&value))
                        {
                            incDelta = static_cast<uint64_t>(
                                (*dblPtr - std::get<double>(_state)) * _delta);
                        }
                        else
                        {
                            // Increase by at least a single delta
                            // to attempt bringing under provided 'state'
                            auto deltaFactor =
                                std::max((std::get<int64_t>(value) -
                                          std::get<int64_t>(_state)),
                                         int64_t(1));
                            incDelta =
                                static_cast<uint64_t>(deltaFactor * _delta);
                        }
                        netDelta = std::max(netDelta, incDelta);
                    }
                }
                else if (std::holds_alternative<bool>(value))
                {
                    // Where a group of booleans equal the state(`true` or
                    // `false`) provided, request an increase of the
                    // configured delta
                    if (_state == value)
                    {
                        netDelta = std::max(netDelta, _delta);
                    }
                }
                else if (std::holds_alternative<std::string>(value))
                {
                    // Where a group of strings equal the state(some string)
                    // provided, request an increase of the configured delta
                    if (_state == value)
                    {
                        netDelta = std::max(netDelta, _delta);
                    }
                }
                else
                {
                    // Unsupported group member type for this action
                    log<level::ERR>(
                        fmt::format("Action {}: Unsupported group member type "
                                    "given. [object = {} : {} : {}]",
                                    ActionBase::getName(), member,
                                    group.getInterface(), group.getProperty())
                            .c_str());
                }
            }
            catch (const std::out_of_range& oore)
            {
                // Property value not found, netDelta unchanged
            }
        });
    }
    // Request increase to target
    zone.requestIncrease(netDelta);
}

void NetTargetIncrease::setState(const json& jsonObj)
{
    if (jsonObj.contains("state"))
    {
        _state = getJsonValue(jsonObj["state"]);
    }
    else if (jsonObj.contains("state_parameter_name"))
    {
        _stateParameter = jsonObj["state_parameter_name"].get<std::string>();
    }
    else
    {
        throw ActionParseError{
            ActionBase::getName(),
            "Missing required state or state_parameter_name value"};
    }
}

void NetTargetIncrease::setDelta(const json& jsonObj)
{
    if (!jsonObj.contains("delta"))
    {
        throw ActionParseError{ActionBase::getName(),
                               "Missing required delta value"};
    }
    _delta = jsonObj["delta"].get<uint64_t>();
}

} // namespace phosphor::fan::control::json