// Copyright (c) 2017-2022, Mudita Sp. z.o.o. All rights reserved.
// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md

#include "SimCard.hpp"

#include <EventStore.hpp>
#include <bsp/cellular/bsp_cellular.hpp>
#include <modem/BaseChannel.hpp>
#include <at/ATFactory.hpp>
#include <at/UrcFactory.hpp>
#include <at/UrcCpin.hpp>
#include <at/cmd/QSIMSTAT.hpp>

namespace cellular
{
    namespace internal
    {
        constexpr const char *pinString[] = {"SC", "P2"};

        service::sim::Result convertErrorFromATResult(const at::Result atres)
        {
            if (std::holds_alternative<at::EquipmentErrorCode>(atres.errorCode)) {

                auto err = static_cast<int>(std::get<at::EquipmentErrorCode>(atres.errorCode));
                if ((err > static_cast<int>(service::sim::Result::AT_ERROR_Begin)) &&
                    (err < static_cast<int>(service::sim::Result::AT_ERROR_End))) {
                    return static_cast<service::sim::Result>(err);
                }
            }
            return service::sim::Result::Unknown;
        }

        std::string simCodeToString(const cellular::api::SimCode &v)
        {
            std::string buf;
            std::transform(v.begin(), v.end(), std::back_inserter(buf), [](auto &&c) { return '0' + c; });
            return buf;
        }

    } // namespace internal

    namespace service
    {
        bool SimCard::ready() const
        {
            return channel != nullptr;
        }

        bool SimCard::initialized() const
        {
            return (Store::GSM::get()->sim == Store::GSM::SIM::SIM1 &&
                    Store::GSM::get()->selected == Store::GSM::SelectedSIM::SIM1) ||
                   (Store::GSM::get()->sim == Store::GSM::SIM::SIM2 &&
                    Store::GSM::get()->selected == Store::GSM::SelectedSIM::SIM2);
        }

        void SimCard::setChannel(at::BaseChannel *channel)
        {
            this->channel = channel;
        }

        bool SimCard::handleSetActiveSim(api::SimSlot sim)
        {
            Store::GSM::get()->selected =
                sim == api::SimSlot::SIM1 ? Store::GSM::SelectedSIM::SIM1 : Store::GSM::SelectedSIM::SIM2;
            bsp::cellular::sim::simSelect();
            bsp::cellular::sim::hotSwapTrigger();
            clearSimInsertedStatus();
            simSelectInProgress = true;
            return true;
        }

        bool SimCard::handleIsPinNeeded() const
        {
            return isPinNeeded();
        }

        bool SimCard::handleChangePin(const api::SimCode &oldPin, const api::SimCode &pin)
        {
            const auto _oldPin = internal::simCodeToString(oldPin);
            const auto _pin    = internal::simCodeToString(pin);
            return processPinResult(changePin(_oldPin, _pin));
        }

        bool SimCard::handleUnblockWithPuk(const api::SimCode &puk, const api::SimCode &pin)
        {
            const auto _puk = internal::simCodeToString(puk);
            const auto _pin = internal::simCodeToString(pin);
            return processPinResult(supplyPuk(_puk, _pin));
        }

        bool SimCard::handleSetPinLock(const api::SimCode &pin, api::SimPinState pinLock)
        {
            const auto _pin = internal::simCodeToString(pin);
            return processPinResult(setPinLock(_pin, pinLock == cellular::api::SimPinState::Enabled));
        }

        bool SimCard::handlePinUnlock(const api::SimCode &pin)
        {
            const auto _pin = internal::simCodeToString(pin);
            return processPinResult(supplyPin(_pin));
        }

        void SimCard::handleATSimStateChange(at::SimState state)
        {
            handleSimState(state);
        }

        void SimCard::handleTrayState()
        {
            bsp::cellular::sim::hotSwapTrigger();
            if (onSimEvent)
                onSimEvent();
        }

        bool SimCard::initSimCard()
        {
            if (!ready()) {
                return false;
            }

            for (const auto &command : at::getCommadsSet(at::commadsSet::simInit)) {
                if (!channel->cmd(command)) {
                    return false;
                }
            }
            return true;
        }

        void SimCard::handleSimState(at::SimState state)
        {
            switch (state) {
            case at::SimState::Ready:
                if (initSimCard()) {
                    switch (Store::GSM::get()->selected) {
                    case Store::GSM::SelectedSIM::SIM1:
                        Store::GSM::get()->sim = Store::GSM::SIM::SIM1;
                        break;
                    case Store::GSM::SelectedSIM::SIM2:
                        Store::GSM::get()->sim = Store::GSM::SIM::SIM2;
                        break;
                    case Store::GSM::SelectedSIM::NONE:
                        Store::GSM::get()->sim = Store::GSM::SIM::NONE;
                        break;
                    }

                    if (onSimReady)
                        onSimReady();
                }
                else {
                    LOG_ERROR("SIM initialization failure!");
                    Store::GSM::get()->sim = Store::GSM::SIM::SIM_FAIL;
                }
                break;
            case at::SimState::NotReady:
                Store::GSM::get()->sim = Store::GSM::SIM::SIM_FAIL;
                break;
            case at::SimState::SimPin:
                [[fallthrough]];
            case at::SimState::SimPin2: {
                Store::GSM::get()->sim = Store::GSM::SIM::SIM_NEED_PIN;
                if (auto pc = getAttemptsCounters(state == at::SimState::SimPin ? sim::Pin::PIN1 : sim::Pin::PIN2);
                    pc) {
                    if (pc.value().PukCounter != 0) {
                        if (onNeedPin)
                            onNeedPin(pc.value().PinCounter);
                        break;
                    }
                }
                if (onSimBlocked)
                    onSimBlocked();
                break;
            }
            case at::SimState::SimPuk:
                [[fallthrough]];
            case at::SimState::SimPuk2: {
                Store::GSM::get()->sim = Store::GSM::SIM::SIM_NEED_PUK;
                if (auto pc = getAttemptsCounters(state == at::SimState::SimPuk ? sim::Pin::PIN1 : sim::Pin::PIN2);
                    pc) {
                    if (pc.value().PukCounter != 0) {
                        if (onNeedPuk)
                            onNeedPuk(pc.value().PukCounter);
                        break;
                    }
                }
                if (onSimBlocked)
                    onSimBlocked();
                break;
            }
            case at::SimState::Locked:
                Store::GSM::get()->sim = Store::GSM::SIM::SIM_LOCKED;
                if (onSimBlocked)
                    onSimBlocked();
                break;
            case at::SimState::PhNetPin:
                [[fallthrough]];
            case at::SimState::PhNetPuk:
                [[fallthrough]];
            case at::SimState::PhNetSPin:
                [[fallthrough]];
            case at::SimState::PhNetSPuk:
                [[fallthrough]];
            case at::SimState::PhSpPin:
                [[fallthrough]];
            case at::SimState::PhSpPuk:
                [[fallthrough]];
            case at::SimState::PhCorpPin:
                [[fallthrough]];
            case at::SimState::PhCorpPuk:
                [[fallthrough]];
            case at::SimState::Unknown:
                LOG_ERROR("SimState not supported");
                Store::GSM::get()->sim = Store::GSM::SIM::SIM_UNKNOWN;
                break;
            }
            if (onSimEvent)
                onSimEvent();
        }

        std::optional<at::response::qpinc::AttemptsCounters> SimCard::getAttemptsCounters(sim::Pin pin) const
        {
            if (!ready()) {
                return std::nullopt;
            }

            auto resp =
                channel->cmd(at::factory(at::AT::QPINC) + "\"" + internal::pinString[static_cast<int>(pin)] + "\"");
            at::response::qpinc::AttemptsCounters ret;
            if (at::response::parseQPINC(resp, ret)) {
                return ret;
            }

            return std::nullopt;
        }

        bool SimCard::processPinResult(sim::Result result)
        {
            if (result == sim::Result::IncorrectPassword) {
                if (auto state = simState(); state) {
                    handleSimState(*state);
                }
            }
            else if (result != sim::Result::OK) {
                if (result == sim::Result::SIM_PUKRequired) {
                    // MOS-242: silence this case to avoid a misleading "wrong PUK" pop-up
                    return false;
                }

                if (onUnhandledCME) {
                    onUnhandledCME(static_cast<unsigned int>(result));
                }
            }

            return result == sim::Result::OK;
        }

        sim::Result SimCard::supplyPin(const std::string &pin) const
        {
            return sendCommand(sim::LockType::PIN, at::factory(at::AT::CPIN) + "\"" + pin + "\"");
        }

        sim::Result SimCard::changePin(const std::string &oldPin, const std::string &newPin) const
        {
            return sendCommand(sim::LockType::PIN,
                               at::factory(at::AT::CPWD) + "\"SC\", \"" + oldPin + "\",\"" + newPin + "\"");
        }

        sim::Result SimCard::supplyPuk(const std::string &puk, const std::string &pin) const
        {
            return sendCommand(sim::LockType::PUK, at::factory(at::AT::CPIN) + "\"" + puk + "\"" + ",\"" + pin + "\"");
        }

        sim::Result SimCard::setPinLock(const std::string &pin, bool lock) const
        {
            return sendCommand(sim::LockType::PIN,
                               at::factory(at::AT::CLCK) + "\"SC\"," + (lock ? "1" : "0") + ",\"" + pin + "\"");
        }

        bool SimCard::isPinNeeded() const
        {
            auto resp = channel->cmd(at::factory(at::AT::CLCK) + "\"SC\",2\r");
            int val   = 0;
            if (at::response::parseCLCK(resp, val)) {
                return val != 0;
            }
            return true;
        }

        std::optional<at::SimState> SimCard::simState() const
        {
            auto resp = channel->cmd(at::factory(at::AT::GET_CPIN));
            if (resp.code == at::Result::Code::OK) {
                if (resp.response.size()) {
                    for (auto el : resp.response) {
                        auto urc = at::urc::UrcFactory::Create(el);
                        if (auto cpin = dynamic_cast<at::urc::Cpin *>(urc.get())) {
                            return cpin->getState();
                        }
                    }
                }
            }
            return at::SimState::Unknown;
        }

        sim::Result SimCard::sendCommand(sim::LockType check, const at::Cmd &cmd) const
        {
            if (auto pc = getAttemptsCounters(); pc) {
                switch (check) {
                case sim::LockType::PIN:
                    if (pc.value().PinCounter == 0)
                        return sim::Result::Locked;
                    break;
                case sim::LockType::PUK:
                    if (pc.value().PukCounter == 0)
                        return sim::Result::Locked;
                    break;
                }
            }
            else {
                return sim::Result::Unknown;
            }

            if (auto resp = channel->cmd(cmd); resp.code != at::Result::Code::OK) {
                return internal::convertErrorFromATResult(resp);
            }

            return sim::Result::OK;
        }

        bool SimCard::isSimCardInserted()
        {
            if (simInserted == std::nullopt) {
                if (simInserted = readSimCardInsertStatus(); !simInserted) {
                    return false;
                }
            }

            if (simInserted == at::SimInsertedStatus::Inserted || simInserted == at::SimInsertedStatus::Unknown) {
                return true;
            }
            return false;
        }

        std::optional<at::SimInsertedStatus> SimCard::readSimCardInsertStatus()
        {
            if (not ready()) {
                LOG_ERROR("SIM not ready yet.");
                return std::nullopt;
            }

            auto command  = at::cmd::QSIMSTAT(at::cmd::Modifier::Get);
            auto response = channel->cmd(command);
            auto result   = command.parseQSIMSTAT(response);

            if (result.code != at::Result::Code::OK) {
                LOG_ERROR("Can't read SIM insertion status.");
                return std::nullopt;
            }
            return result.status;
        }
        void SimCard::handleSimTimer()
        {
            simSelectInProgress = false;
            if (!isSimCardInserted()) {
                if (onSimNotPresent) {
                    onSimNotPresent();
                }
            }
        }
        void SimCard::handleSimInsertionNotification(at::SimInsertedStatus status)
        {
            if (auto actual = getSimInsertedStatus(); actual.has_value() && actual != status) {
                setSimInserted(status);
                if (status == at::SimInsertedStatus::Removed) {
                    if (onSimNotPresent) {
                        onSimNotPresent();
                    }
                }
            }
        }
        void SimCard::handleSimCardSelected()
        {
            if (!isSimSelected) {
                isSimSelected = true;
                if (onSimSelected) {
                    onSimSelected();
                }
                else {
                    LOG_ERROR("onSimSelected callback is missing");
                }
            }
        }
    } // namespace service
} // namespace cellular