/*
    ZWO AM5 INDI driver

    Copyright (C) 2022 Jasem Mutlaq

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "lx200am5.h"

#include "connectionplugins/connectiontcp.h"
#include "lx200driver.h"
#include "indicom.h"

#include <libnova/transform.h>

#include <cmath>
#include <cstring>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <regex>

LX200AM5::LX200AM5()
{
    setVersion(1, 0);

    setLX200Capability(LX200_HAS_PULSE_GUIDING);

    SetTelescopeCapability(TELESCOPE_CAN_PARK |
                           TELESCOPE_CAN_SYNC |
                           TELESCOPE_CAN_GOTO |
                           TELESCOPE_CAN_ABORT |
                           TELESCOPE_CAN_CONTROL_TRACK |
                           TELESCOPE_HAS_TIME |
                           TELESCOPE_HAS_LOCATION |
                           TELESCOPE_HAS_TRACK_MODE,
                           SLEW_MODES);
}

bool LX200AM5::initProperties()
{
    LX200Generic::initProperties();

    SetParkDataType(PARK_NONE);
    timeFormat = LX200_24;

    tcpConnection->setDefaultHost("192.168.4.1");
    tcpConnection->setDefaultPort(4030);
    tcpConnection->setLANSearchEnabled(true);
    setActiveConnection(tcpConnection);

    ///////////////////////////////////////////////////////////////////////////////////////////////////////////////
    /// Properties
    ///////////////////////////////////////////////////////////////////////////////////////////////////////////////

    // Mount Type
    int mountType = Equatorial;
    IUGetConfigOnSwitchIndex(getDeviceName(), "MOUNT_TYPE", &mountType);
    MountTypeSP[Azimuth].fill("Azimuth", "Azimuth", mountType == Azimuth ? ISS_ON : ISS_OFF);
    MountTypeSP[Equatorial].fill("Equatorial", "Equatorial", mountType == Equatorial ? ISS_ON : ISS_OFF);
    MountTypeSP.fill(getDeviceName(), "MOUNT_TYPE", "Mount Type", MAIN_CONTROL_TAB, IP_RW, ISR_1OFMANY, 60, IPS_IDLE);

    if (mountType == Equatorial)
        SetTelescopeCapability(GetTelescopeCapability() | TELESCOPE_HAS_PIER_SIDE, SLEW_MODES);

    // Slew Rates
    strncpy(SlewRateS[0].label, "0.25x", MAXINDILABEL);
    strncpy(SlewRateS[1].label, "0.50x", MAXINDILABEL);
    strncpy(SlewRateS[2].label, "1x", MAXINDILABEL);
    strncpy(SlewRateS[3].label, "2x", MAXINDILABEL);
    strncpy(SlewRateS[4].label, "4x", MAXINDILABEL);
    strncpy(SlewRateS[5].label, "8x", MAXINDILABEL);
    strncpy(SlewRateS[6].label, "20x", MAXINDILABEL);
    strncpy(SlewRateS[7].label, "60x", MAXINDILABEL);
    strncpy(SlewRateS[8].label, "720x", MAXINDILABEL);
    strncpy(SlewRateS[9].label, "1440x", MAXINDILABEL);
    IUResetSwitch(&SlewRateSP);
    // 1440x is the default
    SlewRateS[9].s = ISS_ON;

    // Home/Zero position
    HomeSP[0].fill("GO", "Go", ISS_OFF);
    HomeSP.fill(getDeviceName(), "GO_HOME", "Home", MAIN_CONTROL_TAB, IP_RW, ISR_ATMOST1, 60, IPS_IDLE);

    // Guide Rate
    GuideRateNP[0].fill("RATE", "Rate", "%.2f", 0.1, 0.9, 0.1, 0.5);
    GuideRateNP.fill(getDeviceName(), "GUIDE_RATE", "Guiding Rate", MOTION_TAB, IP_RW, 60, IPS_IDLE);

    // Buzzer
    BuzzerSP[Off].fill("OFF", "Off", ISS_OFF);
    BuzzerSP[Low].fill("LOW", "Low", ISS_OFF);
    BuzzerSP[High].fill("HIGH", "High", ISS_ON);
    BuzzerSP.fill(getDeviceName(), "BUZZER", "Buzzer", OPTIONS_TAB, IP_RW, ISR_1OFMANY, 60, IPS_IDLE);

    return true;
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::updateProperties()
{
    LX200Generic::updateProperties();

    if (isConnected())
    {
        setup();

        defineProperty(HomeSP);
        defineProperty(GuideRateNP);
        defineProperty(BuzzerSP);

    }
    else
    {
        deleteProperty(HomeSP);
        deleteProperty(GuideRateNP);
        deleteProperty(BuzzerSP);
    }

    return true;
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
const char *LX200AM5::getDefaultName()
{
    return "ZWO AM5";
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::checkConnection()
{
    LOG_DEBUG("Checking AM5 connection...");

    double targetRA = 0;
    for (int i = 0; i < 2; i++)
    {
        if (getLX200RA(PortFD, &targetRA) == 0)
            return true;

        const struct timespec ms250_delay = {.tv_sec = 0, .tv_nsec = 250000000};
        nanosleep(&ms250_delay, NULL);
    }

    return false;
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
void LX200AM5::setup()
{
    // Mount Type
    //    MountTypeSP.setState(setMountType(MountTypeSP.findOnSwitchIndex()) ? IPS_OK : IPS_ALERT);
    //    MountTypeSP.apply();

    if (InitPark())
    {
        // If loading parking data is successful, we just set the default parking values.
        SetAxis1ParkDefault(LocationN[LOCATION_LATITUDE].value >= 0 ? 0 : 180);
        SetAxis2ParkDefault(LocationN[LOCATION_LATITUDE].value);
    }
    else
    {
        // Otherwise, we set all parking data to default in case no parking data is found.
        SetAxis1Park(LocationN[LOCATION_LATITUDE].value >= 0 ? 0 : 180);
        SetAxis2Park(LocationN[LOCATION_LATITUDE].value);
        SetAxis1ParkDefault(LocationN[LOCATION_LATITUDE].value >= 0 ? 0 : 180);
        SetAxis2ParkDefault(LocationN[LOCATION_LATITUDE].value);
    }

    getMountType();
    getTrackMode();
    getGuideRate();
    getBuzzer();

}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::ISNewSwitch(const char *dev, const char *name, ISState *states, char *names[], int n)
{
    if (dev != nullptr && strcmp(dev, getDeviceName()) == 0)
    {
        // Mount Type
        if (MountTypeSP.isNameMatch(name))
        {
            int previousType = MountTypeSP.findOnSwitchIndex();
            MountTypeSP.update(states, names, n);
            IPState state = IPS_OK;
            // Only update if already connected.
            if (isConnected())
            {
                auto targetType = MountTypeSP.findOnSwitchIndex();
                state = setMountType(targetType) ? IPS_OK : IPS_ALERT;
                if (state == IPS_OK && previousType != targetType)
                    LOG_WARN("You must restart mount for change to take effect.");
            }
            MountTypeSP.setState(state);
            MountTypeSP.apply();
            return true;
        }

        // Home
        if (HomeSP.isNameMatch(name))
        {
            if (HomeSP.getState() != IPS_BUSY)
            {
                HomeSP[0].setState(ISS_ON);
                HomeSP.setState(goHome() ? IPS_BUSY : IPS_ALERT);
                LOG_INFO("Homing in progress...");
            }
            HomeSP.apply();
            return true;
        }
    }

    return LX200Generic::ISNewSwitch(dev, name, states, names, n);
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::ISNewNumber(const char *dev, const char *name, double values[], char *names[], int n)
{
    if (dev != nullptr && strcmp(dev, getDeviceName()) == 0)
    {
        if (GuideRateNP.isNameMatch(name))
        {
            GuideRateNP.update(values, names, n);
            GuideRateNP.setState(setGuideRate(GuideRateNP[0].getValue()) ? IPS_OK : IPS_ALERT);
            GuideRateNP.apply();
            return true;
        }
    }

    return LX200Generic::ISNewNumber(dev, name, values, names, n);
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::setMountType(int type)
{
    return sendCommand((type == Azimuth) ? ":AA#" : ":AP#");
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::getMountType()
{
    char response[DRIVER_LEN] = {0};
    if (sendCommand(":GU#", response))
    {
        MountTypeSP.reset();
        MountTypeSP[Azimuth].setState(strchr(response, 'Z') ? ISS_ON : ISS_OFF);
        MountTypeSP[Equatorial].setState(strchr(response, 'G') ? ISS_ON : ISS_OFF);
        MountTypeSP.setState(IPS_OK);
        return true;
    }
    else
    {
        MountTypeSP.setState(IPS_ALERT);
        return true;
    }
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::SetSlewRate(int index)
{
    char command[DRIVER_LEN] = {0};
    snprintf(command, DRIVER_LEN, ":R%d#", index);
    return sendCommand(command);
}



/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::setGuideRate(double value)
{
    char command[DRIVER_LEN] = {0};
    snprintf(command, DRIVER_LEN, ":Rg%.2f", value);
    return sendCommand(command);
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::getGuideRate()
{
    char response[DRIVER_LEN] = {0};
    if (sendCommand(":Ggr#", response))
    {
        float rate = 0;
        int result = sscanf(response, "%f", &rate);
        if (result == 1)
        {
            GuideRateNP[0].setValue(rate);
            return true;
        }
    }

    GuideRateNP.setState(IPS_ALERT);
    return false;

}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::getTrackMode()
{
    char response[DRIVER_LEN] = {0};
    if (sendCommand(":GT#", response))
    {
        IUResetSwitch(&TrackModeSP);
        auto onIndex = response[0] - 0x30;
        TrackModeS[onIndex].s = ISS_ON;
        return true;
    }

    TrackModeSP.s = IPS_ALERT;
    return false;

}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::setBuzzer(int value)
{
    char command[DRIVER_LEN] = {0};
    snprintf(command, DRIVER_LEN, ":SBu%d", value);
    return sendCommand(command);
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::getBuzzer()
{
    char response[DRIVER_LEN] = {0};
    if (sendCommand(":GBu#", response))
    {
        BuzzerSP.reset();
        auto onIndex = response[0] - 0x30;
        BuzzerSP[onIndex].setState(ISS_ON);
        BuzzerSP.setState(IPS_OK);
        return true;
    }
    else
    {
        BuzzerSP.setState(IPS_ALERT);
        return true;
    }
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::setUTCOffset(double offset)
{
    int h {0}, m {0}, s {0};
    char command[DRIVER_LEN] = {0};
    offset *= -1;
    getSexComponents(offset, &h, &m, &s);

    snprintf(command, DRIVER_LEN, ":SG%c%02d:%02d#", offset >= 0 ? '+' : '-', std::abs(h), m);
    return setStandardProcedure(PortFD, command) == 0;
}

bool LX200AM5::setLocalDate(uint8_t days, uint8_t months, uint16_t years)
{
    char command[DRIVER_LEN] = {0};
    snprintf(command, DRIVER_LEN, ":SC%02d/%02d/%02d#", months, days, years % 100);
    return setStandardProcedure(PortFD, command) == 0;
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::SetTrackEnabled(bool enabled)
{
    char response[DRIVER_LEN] = {0};
    bool rc = sendCommand(enabled ? ":Te#" : ":Td#", response, 4, 1);
    return rc && response[0] == '1';
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::isTracking()
{
    char response[DRIVER_LEN] = {0};
    bool rc = sendCommand(":GAT#", response);
    return rc && response[0] == '1';
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::goHome()
{
    return sendCommand(":hC#");
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::updateLocation(double latitude, double longitude, double elevation)
{
    INDI_UNUSED(elevation);
    int d{0}, m{0}, s{0};

    // JM 2021-04-10: MUST convert from INDI longitude to standard longitude.
    // DO NOT REMOVE
    if (longitude > 180)
        longitude = longitude - 360;

    char command[DRIVER_LEN] = {0};
    // Reverse as per Meade way
    longitude *= -1;
    getSexComponents(longitude, &d, &m, &s);
    snprintf(command, DRIVER_LEN, ":Sg%c%03d*%02d:%02d#", longitude >= 0 ? '+' : '-', std::abs(d), m, s);
    if (setStandardProcedure(PortFD, command) < 0)
    {
        LOG_ERROR("Error setting site longitude coordinates");
        return false;
    }

    getSexComponents(latitude, &d, &m, &s);
    snprintf(command, DRIVER_LEN, ":St%c%02d*%02d:%02d#", latitude >= 0 ? '+' : '-', std::abs(d), m, s);
    if (setStandardProcedure(PortFD, command) < 0)
    {
        LOG_ERROR("Error setting site latitude coordinates");
        return false;
    }

    return true;
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::Park()
{
    bool rc = goHome();
    if (rc)
        TrackState = SCOPE_PARKING;
    return rc;
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::ReadScopeStatus()
{
    if (!isConnected())
        return false;

    bool slewComplete = false, isHome = false;
    char status[DRIVER_LEN] = {0};
    if (sendCommand(":GU#", status))
    {
        slewComplete = strchr(status, 'N');
        isHome = strchr(status, 'H');
    }

    if (HomeSP.getState() == IPS_BUSY && isHome)
    {
        HomeSP[0].setState(ISS_OFF);
        HomeSP.setState(IPS_OK);
        LOG_INFO("Arrived at home.");
        HomeSP.apply();
        TrackState = SCOPE_IDLE;
    }
    else if (TrackState == SCOPE_SLEWING)
    {
        // Check if LX200 is done slewing
        if (slewComplete)
        {
            TrackState = SCOPE_TRACKING;
            LOG_INFO("Slew is complete. Tracking...");
        }
    }
    else if (TrackState == SCOPE_PARKING)
    {
        if (slewComplete)
        {
            SetParked(true);
        }
    }
    else
    {
        // Tracking changed?
        auto wasTracking = TrackStateS[INDI_ENABLED].s == ISS_ON;
        auto nowTracking = isTracking();
        if (wasTracking != nowTracking)
            TrackState = nowTracking ? SCOPE_TRACKING : SCOPE_IDLE;
    }

    if (getLX200RA(PortFD, &currentRA) < 0 || getLX200DEC(PortFD, &currentDEC) < 0)
    {
        EqNP.s = IPS_ALERT;
        IDSetNumber(&EqNP, "Error reading RA/DEC.");
        return false;
    }

    if (HasPierSide())
    {
        char response[DRIVER_LEN] = {0};
        if (sendCommand(":Gm#", response))
        {
            if (response[0] == 'W')
                setPierSide(PIER_WEST);
            else if (response[0] == 'E')
                setPierSide(PIER_EAST);
            else
                setPierSide(PIER_UNKNOWN);
        }
    }

    NewRaDec(currentRA, currentDEC);

    return true;
}

/////////////////////////////////////////////////////////////////////////////
/// Send Command
/////////////////////////////////////////////////////////////////////////////
bool LX200AM5::sendCommand(const char * cmd, char * res, int cmd_len, int res_len)
{
    int nbytes_written = 0, nbytes_read = 0, rc = -1;

    tcflush(PortFD, TCIOFLUSH);

    if (cmd_len > 0)
    {
        char hex_cmd[DRIVER_LEN * 3] = {0};
        hexDump(hex_cmd, cmd, cmd_len);
        LOGF_DEBUG("CMD <%s>", hex_cmd);
        rc = tty_write(PortFD, cmd, cmd_len, &nbytes_written);
    }
    else
    {
        LOGF_DEBUG("CMD <%s>", cmd);
        rc = tty_write_string(PortFD, cmd, &nbytes_written);
    }

    if (rc != TTY_OK)
    {
        char errstr[MAXRBUF] = {0};
        tty_error_msg(rc, errstr, MAXRBUF);
        LOGF_ERROR("Serial write error: %s.", errstr);
        return false;
    }

    if (res == nullptr)
    {
        tcdrain(PortFD);
        return true;
    }

    if (res_len > 0)
        rc = tty_read(PortFD, res, res_len, DRIVER_TIMEOUT, &nbytes_read);
    else
        rc = tty_nread_section(PortFD, res, DRIVER_LEN, DRIVER_STOP_CHAR, DRIVER_TIMEOUT, &nbytes_read);

    if (rc != TTY_OK)
    {
        char errstr[MAXRBUF] = {0};
        tty_error_msg(rc, errstr, MAXRBUF);
        LOGF_ERROR("Serial read error: %s.", errstr);
        return false;
    }

    if (res_len > 0)
    {
        char hex_res[DRIVER_LEN * 3] = {0};
        hexDump(hex_res, res, res_len);
        LOGF_DEBUG("RES <%s>", hex_res);
    }
    else
    {
        LOGF_DEBUG("RES <%s>", res);
    }

    tcflush(PortFD, TCIOFLUSH);

    return true;
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
void LX200AM5::hexDump(char * buf, const char * data, int size)
{
    for (int i = 0; i < size; i++)
        sprintf(buf + 3 * i, "%02X ", static_cast<uint8_t>(data[i]));

    if (size > 0)
        buf[3 * size - 1] = '\0';
}

/////////////////////////////////////////////////////////////////////////////
///
/////////////////////////////////////////////////////////////////////////////
std::vector<std::string> LX200AM5::split(const std::string &input, const std::string &regex)
{
    // passing -1 as the submatch index parameter performs splitting
    std::regex re(regex);
    std::sregex_token_iterator
    first{input.begin(), input.end(), re, -1},
          last;
    return {first, last};
}
