#include <AP_HAL/AP_HAL.h>
#include <AP_Notify/AP_Notify.h>
#include <GCS_MAVLink/GCS.h>

#include "AP_Compass.h"

extern AP_HAL::HAL& hal;

void
Compass::compass_cal_update()
{
    bool running = false;

    for (uint8_t i=0; i<COMPASS_MAX_INSTANCES; i++) {
        bool failure;
        _calibrator[i].update(failure);
        if (failure) {
            AP_Notify::events.compass_cal_failed = 1;
        }

        if (_calibrator[i].check_for_timeout()) {
            AP_Notify::events.compass_cal_failed = 1;
            cancel_calibration_all();
        }

        if (_calibrator[i].running()) {
            running = true;
        } else if (_cal_autosave && !_cal_saved[i] && _calibrator[i].get_status() == COMPASS_CAL_SUCCESS) {
            _accept_calibration(i);
        }
    }

    AP_Notify::flags.compass_cal_running = running;

    if (is_calibrating()) {
        _cal_has_run = true;
        return;
    } else if (_cal_has_run && _auto_reboot()) {
        hal.scheduler->delay(1000);
        hal.scheduler->reboot(false);
    }
}

bool
Compass::_start_calibration(uint8_t i, bool retry, float delay)
{
    if (!healthy(i)) {
        return false;
    }
    if (!use_for_yaw(i)) {
        return false;
    }
    if (!is_calibrating()) {
        AP_Notify::events.initiated_compass_cal = 1;
    }
    if (i == get_primary() && _state[i].external != 0) {
        _calibrator[i].set_tolerance(_calibration_threshold);
    } else {
        // internal compasses or secondary compasses get twice the
        // threshold. This is because internal compasses tend to be a
        // lot noisier
        _calibrator[i].set_tolerance(_calibration_threshold*2);
    }
    _cal_saved[i] = false;
    _calibrator[i].start(retry, delay);

    // disable compass learning both for calibration and after completion
    _learn.set_and_save(0);

    return true;
}

bool
Compass::_start_calibration_mask(uint8_t mask, bool retry, bool autosave, float delay, bool autoreboot)
{
    _cal_autosave = autosave;
    _compass_cal_autoreboot = autoreboot;

    for (uint8_t i=0; i<COMPASS_MAX_INSTANCES; i++) {
        if ((1<<i) & mask) {
            if (!_start_calibration(i,retry,delay)) {
                _cancel_calibration_mask(mask);
                return false;
            }
        }
    }
    return true;
}

void
Compass::start_calibration_all(bool retry, bool autosave, float delay, bool autoreboot)
{
    _cal_autosave = autosave;
    _compass_cal_autoreboot = autoreboot;

    for (uint8_t i=0; i<COMPASS_MAX_INSTANCES; i++) {
        // ignore any compasses that fail to start calibrating
        // start all should only calibrate compasses that are being used
        _start_calibration(i,retry,delay);
    }
}

void
Compass::_cancel_calibration(uint8_t i)
{
    AP_Notify::events.initiated_compass_cal = 0;

    if (_calibrator[i].running() || _calibrator[i].get_status() == COMPASS_CAL_WAITING_TO_START) {
        AP_Notify::events.compass_cal_canceled = 1;
    }
    _cal_saved[i] = false;
    _calibrator[i].clear();
}

void
Compass::_cancel_calibration_mask(uint8_t mask)
{
    for(uint8_t i=0; i<COMPASS_MAX_INSTANCES; i++) {
        if((1<<i) & mask) {
            _cancel_calibration(i);
        }
    }
}

void
Compass::cancel_calibration_all()
{
    _cancel_calibration_mask(0xFF);
}

bool
Compass::_accept_calibration(uint8_t i)
{
    CompassCalibrator& cal = _calibrator[i];
    uint8_t cal_status = cal.get_status();

    if (_cal_saved[i] || cal_status == COMPASS_CAL_NOT_STARTED) {
        return true;
    } else if (cal_status == COMPASS_CAL_SUCCESS) {
        _cal_complete_requires_reboot = true;
        _cal_saved[i] = true;

        Vector3f ofs, diag, offdiag;
        cal.get_calibration(ofs, diag, offdiag);

        set_and_save_offsets(i, ofs);
        set_and_save_diagonals(i,diag);
        set_and_save_offdiagonals(i,offdiag);

        if (!is_calibrating()) {
            AP_Notify::events.compass_cal_saved = 1;
        }
        return true;
    } else {
        return false;
    }
}

bool
Compass::_accept_calibration_mask(uint8_t mask)
{
    bool success = true;
    for (uint8_t i=0; i<COMPASS_MAX_INSTANCES; i++) {
        if ((1<<i) & mask) {
            if (!_accept_calibration(i)) {
                success = false;
            }
            _calibrator[i].clear();
        }
    }

    return success;
}

void
Compass::send_mag_cal_progress(mavlink_channel_t chan)
{
    uint8_t cal_mask = _get_cal_mask();

    for (uint8_t compass_id=0; compass_id<COMPASS_MAX_INSTANCES; compass_id++) {
        // ensure we don't try to send with no space available
        if (!HAVE_PAYLOAD_SPACE(chan, MAG_CAL_PROGRESS)) {
            return;
        }

        auto& calibrator = _calibrator[compass_id];
        uint8_t cal_status = calibrator.get_status();

        if (cal_status == COMPASS_CAL_WAITING_TO_START  ||
            cal_status == COMPASS_CAL_RUNNING_STEP_ONE ||
            cal_status == COMPASS_CAL_RUNNING_STEP_TWO) {
            uint8_t completion_pct = calibrator.get_completion_percent();
            auto& completion_mask = calibrator.get_completion_mask();
            Vector3f direction(0.0f,0.0f,0.0f);
            uint8_t attempt = _calibrator[compass_id].get_attempt();

            mavlink_msg_mag_cal_progress_send(
                chan,
                compass_id, cal_mask,
                cal_status, attempt, completion_pct, completion_mask,
                direction.x, direction.y, direction.z
            );
        }
    }
}

void Compass::send_mag_cal_report(mavlink_channel_t chan)
{
    uint8_t cal_mask = _get_cal_mask();

    for (uint8_t compass_id=0; compass_id<COMPASS_MAX_INSTANCES; compass_id++) {
        // ensure we don't try to send with no space available
        if (!HAVE_PAYLOAD_SPACE(chan, MAG_CAL_REPORT)) {
            return;
        }

        uint8_t cal_status = _calibrator[compass_id].get_status();
        if ((cal_status == COMPASS_CAL_SUCCESS ||
            cal_status == COMPASS_CAL_FAILED)) {
            float fitness = _calibrator[compass_id].get_fitness();
            Vector3f ofs, diag, offdiag;
            _calibrator[compass_id].get_calibration(ofs, diag, offdiag);
            uint8_t autosaved = _cal_saved[compass_id];

            mavlink_msg_mag_cal_report_send(
                chan,
                compass_id, cal_mask,
                cal_status, autosaved,
                fitness,
                ofs.x, ofs.y, ofs.z,
                diag.x, diag.y, diag.z,
                offdiag.x, offdiag.y, offdiag.z
            );
        }
    }
}

bool
Compass::is_calibrating() const
{
    for (uint8_t i=0; i<COMPASS_MAX_INSTANCES; i++) {
        switch(_calibrator[i].get_status()) {
            case COMPASS_CAL_NOT_STARTED:
            case COMPASS_CAL_SUCCESS:
            case COMPASS_CAL_FAILED:
                break;
            default:
                return true;
        }
    }
    return false;
}

uint8_t
Compass::_get_cal_mask() const
{
    uint8_t cal_mask = 0;
    for (uint8_t i=0; i<COMPASS_MAX_INSTANCES; i++) {
        if (_calibrator[i].get_status() != COMPASS_CAL_NOT_STARTED) {
            cal_mask |= 1 << i;
        }
    }
    return cal_mask;
}


/*
  handle an incoming MAG_CAL command
 */
uint8_t Compass::handle_mag_cal_command(const mavlink_command_long_t &packet)
{
    uint8_t result = MAV_RESULT_FAILED;

    switch (packet.command) {
    case MAV_CMD_DO_START_MAG_CAL: {
        result = MAV_RESULT_ACCEPTED;
        if (hal.util->get_soft_armed()) {
            hal.console->printf("Disarm for compass calibration\n");
            result = MAV_RESULT_FAILED;
            break;
        }
        if (packet.param1 < 0 || packet.param1 > 255) {
            result = MAV_RESULT_FAILED;
            break;
        }

        uint8_t mag_mask = packet.param1;
        bool retry = !is_zero(packet.param2);
        bool autosave = !is_zero(packet.param3);
        float delay = packet.param4;
        bool autoreboot = !is_zero(packet.param5);

        if (mag_mask == 0) { // 0 means all
            start_calibration_all(retry, autosave, delay, autoreboot);
        } else {
            if (!_start_calibration_mask(mag_mask, retry, autosave, delay, autoreboot)) {
                result = MAV_RESULT_FAILED;
            }
        }
        
        break;
    }

    case MAV_CMD_DO_ACCEPT_MAG_CAL: {
        result = MAV_RESULT_ACCEPTED;
        if(packet.param1 < 0 || packet.param1 > 255) {
            result = MAV_RESULT_FAILED;
            break;
        }
        
        uint8_t mag_mask = packet.param1;
        
        if (mag_mask == 0) { // 0 means all
            mag_mask = 0xFF;
        }
        
        if(!_accept_calibration_mask(mag_mask)) {
            result = MAV_RESULT_FAILED;
        }
        break;
    }
        
    case MAV_CMD_DO_CANCEL_MAG_CAL: {
        result = MAV_RESULT_ACCEPTED;
        if(packet.param1 < 0 || packet.param1 > 255) {
            result = MAV_RESULT_FAILED;
            break;
        }
        
        uint8_t mag_mask = packet.param1;
        
        if (mag_mask == 0) { // 0 means all
            cancel_calibration_all();
            break;
        }
        
        _cancel_calibration_mask(mag_mask);
        break;
    }
    }
    
    return result;
}
