/**
 * Copyright 2017 Google Inc.
 *
 * 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 "pid/builder.hpp"

#include "conf.hpp"
#include "manager.hpp"
#include "pid/controller.hpp"
#include "pid/fancontroller.hpp"
#include "pid/stepwisecontroller.hpp"
#include "pid/thermalcontroller.hpp"
#include "pid/zone.hpp"
#include "pid/zone_interface.hpp"
#include "util.hpp"

#include <sdbusplus/bus.hpp>

#include <cstdint>
#include <iostream>
#include <map>
#include <memory>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>

namespace pid_control
{

static constexpr bool deferSignals = true;
static constexpr auto objectPath = "/xyz/openbmc_project/settings/fanctrl/zone";

static std::string getControlPath(int64_t zone)
{
    return std::string(objectPath) + std::to_string(zone);
}

static std::string getPidControlPath(int64_t zone, const std::string& pidname)
{
    return std::string(objectPath) + std::to_string(zone) + "/" + pidname;
}

std::unordered_map<int64_t, std::shared_ptr<ZoneInterface>> buildZones(
    const std::map<int64_t, conf::PIDConf>& zonePids,
    std::map<int64_t, conf::ZoneConfig>& zoneConfigs, SensorManager& mgr,
    sdbusplus::bus_t& modeControlBus)
{
    std::unordered_map<int64_t, std::shared_ptr<ZoneInterface>> zones;

    for (const auto& [zoneId, pidConfig] : zonePids)
    {
        /* The above shouldn't be necessary but is, and I am having trouble
         * locating my notes on why.  If I recall correctly it was casting it
         * down to a byte in at least some cases causing weird behaviors.
         */
        auto zoneConf = zoneConfigs.find(zoneId);
        if (zoneConf == zoneConfigs.end())
        {
            /* The Zone doesn't have a configuration, bail. */
            static constexpr auto err =
                "Bailing during load, missing Zone Configuration";
            std::cerr << err << std::endl;
            throw std::runtime_error(err);
        }

        auto zone = std::make_shared<DbusPidZone>(
            zoneId, zoneConf->second.minThermalOutput,
            zoneConf->second.failsafePercent, zoneConf->second.cycleTime, mgr,
            modeControlBus, getControlPath(zoneId).c_str(), deferSignals,
            zoneConf->second.accumulateSetPoint);

        std::cerr << "Zone Id: " << zone->getZoneID() << "\n";

        // For each PID create a Controller and a Sensor.
        for (const auto& [name, info] : pidConfig)
        {
            std::vector<pid_control::conf::SensorInput> inputs;
            std::cerr << "PID name: " << name << "\n";

            /*
             * TODO(venture): Need to check if input is known to the
             * SensorManager.
             */
            if (info.type == "fan")
            {
                for (const auto& i : info.inputs)
                {
                    inputs.push_back(i);
                    zone->addFanInput(i.name, i.missingIsAcceptable);
                }

                auto pid = FanController::createFanPid(
                    zone.get(), name, splitNames(inputs), info.pidInfo);
                zone->addFanPID(std::move(pid));
                zone->addPidFailSafePercent(splitNames(inputs),
                                            info.failSafePercent);
            }
            else if (isThermalType(info.type))
            {
                for (const auto& i : info.inputs)
                {
                    inputs.push_back(i);
                    zone->addThermalInput(i.name, i.missingIsAcceptable);
                }

                auto pid = ThermalController::createThermalPid(
                    zone.get(), name, inputs, info.setpoint, info.pidInfo,
                    getThermalType(info.type));

                zone->addThermalPID(std::move(pid));
                zone->addPidControlProcess(
                    name, info.type, info.setpoint, modeControlBus,
                    getPidControlPath(zoneId, name), deferSignals);
                zone->addPidFailSafePercent(splitNames(inputs),
                                            info.failSafePercent);
            }
            else if (info.type == "stepwise")
            {
                for (const auto& i : info.inputs)
                {
                    inputs.push_back(i);
                    zone->addThermalInput(i.name, i.missingIsAcceptable);
                }
                auto stepwise = StepwiseController::createStepwiseController(
                    zone.get(), name, splitNames(inputs), info.stepwiseInfo);
                zone->addThermalPID(std::move(stepwise));
                zone->addPidControlProcess(
                    name, info.type, info.setpoint, modeControlBus,
                    getPidControlPath(zoneId, name), deferSignals);
                zone->addPidFailSafePercent(splitNames(inputs),
                                            info.failSafePercent);
            }

            std::cerr << "inputs: ";
            for (const auto& i : inputs)
            {
                std::cerr << i.name;
                if (i.convertTempToMargin)
                {
                    std::cerr << "[" << i.convertMarginZero << "]";
                }
                if (i.missingIsAcceptable)
                {
                    std::cerr << "?";
                }
                std::cerr << ", ";
            }
            std::cerr << "\n";
        }

        zone->emit_object_added();
        zones[zoneId] = std::move(zone);
    }

    return zones;
}

} // namespace pid_control