'use strict';

TABS.pid_tuning = {
    RATE_PROFILE_MASK: 128,
    showAllPids: false,
    updating: true,
    dirty: false,
    currentProfile: null,
    currentRateProfile: null
};

TABS.pid_tuning.initialize = function (callback) {
    var self = this;

    if (GUI.active_tab !== 'pid_tuning') {
        GUI.active_tab = 'pid_tuning';
    }

    // requesting MSP_STATUS manually because it contains CONFIG.profile
    MSP.promise(MSPCodes.MSP_STATUS).then(function() {
        if (semver.gte(CONFIG.apiVersion, CONFIGURATOR.pidControllerChangeMinApiVersion)) {
            return MSP.promise(MSPCodes.MSP_PID_CONTROLLER);
        }
    }).then(function() {
        return MSP.promise(MSPCodes.MSP_PIDNAMES)
    }).then(function() {
        return MSP.promise(MSPCodes.MSP_PID);
    }).then(function () {
        if (semver.gte(CONFIG.flightControllerVersion, "2.9.0") && semver.lt(CONFIG.flightControllerVersion, "2.9.1")) {
          return MSP.promise(MSPCodes.MSP_SPECIAL_PARAMETERS);
        }
    }).then(function() {
        if (semver.gte(CONFIG.flightControllerVersion, "2.8.2")) {
          return MSP.promise(MSPCodes.MSP_PID_ADVANCED);
        }
    }).then(function() {
        if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
          return MSP.promise(MSPCodes.MSP_RX_CONFIG);
        }
    }).then(function() {
        return MSP.promise(MSPCodes.MSP_RC_TUNING);
    }).then(function() {
        return MSP.promise(MSPCodes.MSP_FILTER_CONFIG);
    }).then(function() {
        var promise = true;
        if (CONFIG.flightControllerIdentifier === "BTFL" && semver.gte(CONFIG.flightControllerVersion, "2.8.0")) {
            promise = MSP.promise(MSPCodes.MSP_BF_CONFIG);
        }

        return promise;
    }).then(function() {
        $('#content').load("./tabs/pid_tuning.html", process_html);
    });

    function pid_and_rc_to_form() {
        self.setProfile();
        if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
            self.setRateProfile();
        }

        if (semver.gte(CONFIG.flightControllerVersion, "2.8.1")) {
            $('input[name="vbatpidcompensation"]').prop('checked', ADVANCED_TUNING.vbatPidCompensation !== 0);
        }

        if (semver.gte(CONFIG.flightControllerVersion, "2.8.2")) {
            $('#pid-tuning .delta select').val(ADVANCED_TUNING.deltaMethod);
        }

        if (semver.gte(CONFIG.flightControllerVersion, '3.0.0')) {
            $('select[name="rcInterpolation-select"]').val(RX_CONFIG.rcInterpolation);

            $('input[name="rcInterpolationInterval-number"]').val(RX_CONFIG.rcInterpolationInterval);

            $('input[name="ptermSetpoint-number"]').val(ADVANCED_TUNING.ptermSetpointWeight / 100);
            $('input[name="ptermSetpoint-range"]').val(ADVANCED_TUNING.ptermSetpointWeight / 100);

            $('input[name="dtermSetpoint-number"]').val(ADVANCED_TUNING.dtermSetpointWeight / 100);
            $('input[name="dtermSetpoint-range"]').val(ADVANCED_TUNING.dtermSetpointWeight / 100);

            self.updateRcInterpolationParameters();
        }

        // Fill in the data from PIDs array
        var i = 0;
        $('.pid_tuning .ROLL input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[0][i++]);
                    break;
                case 1:
                    $(this).val(PIDs[0][i++]);
                    break;
                case 2:
                    $(this).val(PIDs[0][i++]);
                    break;
            }
        });

        i = 0;
        $('.pid_tuning .PITCH input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[1][i++]);
                    break;
                case 1:
                    $(this).val(PIDs[1][i++]);
                    break;
                case 2:
                    $(this).val(PIDs[1][i++]);
                    break;
            }
        });

        i = 0;
        $('.pid_tuning .YAW input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[2][i++]);
                    break;
                case 1:
                    $(this).val(PIDs[2][i++]);
                    break;
            }
        });
        $('.pid_tuning .YAW_JUMP_PREVENTION input').each(function () {
            switch (i) {
                case 2:
                    $(this).val(PIDs[2][i++]);
                    break;
            }
        });

        i = 0;
        $('.pid_tuning .ALT input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[3][i++]);
                    break;
                case 1:
                    $(this).val(PIDs[3][i++]);
                    break;
                case 2:
                    $(this).val(PIDs[3][i++]);
                    break;
            }
        });

        i = 0;
        $('.pid_tuning .Pos input').each(function () {
            $(this).val(PIDs[4][i++]);
        });

        i = 0;
        $('.pid_tuning .PosR input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[5][i++]);
                    break;
                case 1:
                    $(this).val(PIDs[5][i++]);
                    break;
                case 2:
                    $(this).val(PIDs[5][i++]);
                    break;
            }
        });

        i = 0;
        $('.pid_tuning .NavR input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[6][i++]);
                    break;
                case 1:
                    $(this).val(PIDs[6][i++]);
                    break;
                case 2:
                    $(this).val(PIDs[6][i++]);
                    break;
            }
        });

        i = 0;
        $('.pid_tuning .ANGLE input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[7][i++]);
                    break;
            }
        });
        $('.pid_tuning .HORIZON input').each(function () {
            switch (i) {
                case 1:
                    $(this).val(PIDs[7][i++]);
                    break;
                case 2:
                    $(this).val(PIDs[7][i++]);
                    break;
            }
        });

        i = 0;
        $('.pid_tuning .MAG input').each(function () {
            $(this).val(PIDs[8][i++]);
        });

        i = 0;
        $('.pid_tuning .Vario input').each(function () {
            switch (i) {
                case 0:
                    $(this).val(PIDs[9][i++]);
                    break;
                case 1:
                    $(this).val(PIDs[9][i++]);
                    break;
                case 2:
                    $(this).val(PIDs[9][i++]);
                    break;
            }
        });

        // Fill in data from RC_tuning object
        $('.pid_tuning input[name="rc_rate"]').val(RC_tuning.RC_RATE.toFixed(2));
        $('.pid_tuning input[name="roll_pitch_rate"]').val(RC_tuning.roll_pitch_rate.toFixed(2));
        $('.pid_tuning input[name="roll_rate"]').val(RC_tuning.roll_rate.toFixed(2));
        $('.pid_tuning input[name="pitch_rate"]').val(RC_tuning.pitch_rate.toFixed(2));
        $('.pid_tuning input[name="yaw_rate"]').val(RC_tuning.yaw_rate.toFixed(2));
        $('.pid_tuning input[name="rc_expo"]').val(RC_tuning.RC_EXPO.toFixed(2));
        $('.pid_tuning input[name="rc_yaw_expo"]').val(RC_tuning.RC_YAW_EXPO.toFixed(2));
        $('.pid_tuning input[name="rc_rate_yaw"]').val(RC_tuning.rcYawRate.toFixed(2));

        $('.throttle input[name="mid"]').val(RC_tuning.throttle_MID.toFixed(2));
        $('.throttle input[name="expo"]').val(RC_tuning.throttle_EXPO.toFixed(2));

        $('.tpa input[name="tpa"]').val(RC_tuning.dynamic_THR_PID.toFixed(2));
        $('.tpa input[name="tpa-breakpoint"]').val(RC_tuning.dynamic_THR_breakpoint);

        if (semver.lt(CONFIG.apiVersion, "1.10.0")) {
            $('.pid_tuning input[name="rc_yaw_expo"]').hide();
            $('.pid_tuning input[name="rc_expo"]').attr("rowspan", "3");
        }

        $('.pid_tuning input[name="gyro"]').val(FILTER_CONFIG.gyro_soft_lpf_hz);
        $('.pid_tuning input[name="dterm"]').val(FILTER_CONFIG.dterm_lpf_hz);
        $('.pid_tuning input[name="yaw"]').val(FILTER_CONFIG.yaw_lpf_hz);

        if (semver.lt(CONFIG.flightControllerVersion, "2.9.0")) {
            $('.pid_filter').hide();
            $('.pid_tuning input[name="rc_rate_yaw"]').hide();
        }
    }

    function form_to_pid_and_rc() {
        if (semver.gte(CONFIG.flightControllerVersion, "2.8.0")) {
            BF_CONFIG.features.updateData($('input[name="SUPEREXPO_RATES"]'));
        }

        if (semver.gte(CONFIG.flightControllerVersion, "2.8.1")) {
            ADVANCED_TUNING.vbatPidCompensation = $('input[name="vbatpidcompensation"]').is(':checked') ? 1 : 0;
        }

        if (semver.gte(CONFIG.flightControllerVersion, "2.8.2")) {
            ADVANCED_TUNING.deltaMethod = $('#pid-tuning .delta select').val();
        }

        if (semver.gte(CONFIG.flightControllerVersion, '3.0.0')) {
            RX_CONFIG.rcInterpolation = parseInt($('select[name="rcInterpolation-select"]').val());

            RX_CONFIG.rcInterpolationInterval = parseInt($('input[name="rcInterpolationInterval-number"]').val());

            ADVANCED_TUNING.ptermSetpointWeight = parseInt($('input[name="ptermSetpoint-number"]').val() * 100);

            ADVANCED_TUNING.dtermSetpointWeight = parseInt($('input[name="dtermSetpoint-number"]').val() * 100);
        }

        // Fill in the data from PIDs array
        // Catch all the changes and stuff the inside PIDs array
        var i = 0;
        $('table.pid_tuning tr.ROLL .pid_data input').each(function () {
            PIDs[0][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.PITCH .pid_data input').each(function () {
            PIDs[1][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.YAW .pid_data input').each(function () {
            PIDs[2][i++] = parseFloat($(this).val());
        });
        $('table.pid_tuning tr.YAW_JUMP_PREVENTION .pid_data input').each(function () {
            PIDs[2][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.ALT input').each(function () {
            PIDs[3][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.Vario input').each(function () {
            PIDs[9][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.Pos input').each(function () {
            PIDs[4][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.PosR input').each(function () {
            PIDs[5][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.NavR input').each(function () {
            PIDs[6][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.ANGLE input').each(function () {
            PIDs[7][i++] = parseFloat($(this).val());
        });
        $('table.pid_tuning tr.HORIZON input').each(function () {
            PIDs[7][i++] = parseFloat($(this).val());
        });

        i = 0;
        $('table.pid_tuning tr.MAG input').each(function () {
            PIDs[8][i++] = parseFloat($(this).val());
        });

        // catch RC_tuning changes
        RC_tuning.RC_RATE = parseFloat($('.pid_tuning input[name="rc_rate"]').val());
        RC_tuning.roll_pitch_rate = parseFloat($('.pid_tuning input[name="roll_pitch_rate"]').val());
        RC_tuning.roll_rate = parseFloat($('.pid_tuning input[name="roll_rate"]').val());
        RC_tuning.pitch_rate = parseFloat($('.pid_tuning input[name="pitch_rate"]').val());
        RC_tuning.yaw_rate = parseFloat($('.pid_tuning input[name="yaw_rate"]').val());
        RC_tuning.RC_EXPO = parseFloat($('.pid_tuning input[name="rc_expo"]').val());
        RC_tuning.RC_YAW_EXPO = parseFloat($('.pid_tuning input[name="rc_yaw_expo"]').val());
        RC_tuning.rcYawRate = parseFloat($('.pid_tuning input[name="rc_rate_yaw"]').val());

        RC_tuning.throttle_MID = parseFloat($('.throttle input[name="mid"]').val());
        RC_tuning.throttle_EXPO = parseFloat($('.throttle input[name="expo"]').val())

        RC_tuning.dynamic_THR_PID = parseFloat($('.tpa input[name="tpa"]').val());
        RC_tuning.dynamic_THR_breakpoint = parseInt($('.tpa input[name="tpa-breakpoint"]').val());
        FILTER_CONFIG.gyro_soft_lpf_hz = parseInt($('.pid_tuning input[name="gyro"]').val());
        FILTER_CONFIG.dterm_lpf_hz = parseInt($('.pid_tuning input[name="dterm"]').val());
        FILTER_CONFIG.yaw_lpf_hz = parseInt($('.pid_tuning input[name="yaw"]').val());
    }

    function showAllPids() {
        $('.tab-pid_tuning .pid_tuning').show();
    }

    function hideUnusedPids() {
        $('.tab-pid_tuning .pid_tuning').hide();

        $('#pid_main').show();

        if (semver.gte(CONFIG.flightControllerVersion, "2.9.0")) {
            $('#pid_filter').show();
        }

        if (have_sensor(CONFIG.activeSensors, 'acc')) {
            $('#pid_accel').show();
            $('#pid_level').show();
        }

        var showTitle = false;
        if (have_sensor(CONFIG.activeSensors, 'baro') ||
            have_sensor(CONFIG.activeSensors, 'sonar')) {
            $('#pid_baro').show();
            showTitle = true;
        }
        if (have_sensor(CONFIG.activeSensors, 'mag')) {
            $('#pid_mag').show();
            showTitle = true;
        }
        if (BF_CONFIG.features.isEnabled('GPS')) {
            $('#pid_gps').show();
            showTitle = true;
        }

        if (showTitle) {
            $('#pid_optional').show();
        }
    }

    function drawAxes(curveContext, width, height, scaleHeight) {
        curveContext.strokeStyle = '#000000';
        curveContext.lineWidth = 4;

        // Horizontal
        curveContext.beginPath();
        curveContext.moveTo(0, height / 2);
        curveContext.lineTo(width, height / 2);
        curveContext.stroke();

        // Vertical
        curveContext.beginPath();
        curveContext.moveTo(width / 2, 0);
        curveContext.lineTo(width / 2, height);
        curveContext.stroke();

        if (scaleHeight <= height / 2) {
            curveContext.strokeStyle = '#c0c0c0';
            curveContext.lineWidth = 4;

            curveContext.beginPath();
            curveContext.moveTo(0, height / 2 + scaleHeight);
            curveContext.lineTo(width, height / 2 + scaleHeight);
            curveContext.stroke();

            curveContext.beginPath();
            curveContext.moveTo(0, height / 2 - scaleHeight);
            curveContext.lineTo(width, height / 2 - scaleHeight);
            curveContext.stroke();
        }
    }

    function checkInput(element) {
        var value = parseFloat(element.val());
        if (value < parseFloat(element.prop('min'))
            || value > parseFloat(element.prop('max'))) {
            value = undefined;
        }

        return value;
    }

    var useLegacyCurve = false;
    if (CONFIG.flightControllerIdentifier !== "BTFL" || semver.lt(CONFIG.flightControllerVersion, "2.8.0")) {
        useLegacyCurve = true;
    }

    self.rateCurve = new RateCurve(useLegacyCurve);

    function printMaxAngularVel(rate, rcRate, rcExpo, useSuperExpo, maxAngularVelElement) {
        var maxAngularVel = self.rateCurve.getMaxAngularVel(rate, rcRate, rcExpo, useSuperExpo);
        maxAngularVelElement.text(maxAngularVel);

        return maxAngularVel;
    }

    function drawCurve(rate, rcRate, rcExpo, useSuperExpo, maxAngularVel, colour, yOffset, context) {
        context.save();
        context.strokeStyle = colour;
        context.translate(0, yOffset);
        self.rateCurve.draw(rate, rcRate, rcExpo, useSuperExpo, maxAngularVel, context);
        context.restore();
    }

    function process_html() {
        if (semver.gte(CONFIG.flightControllerVersion, "2.8.0")) {
            BF_CONFIG.features.generateElements($('.tab-pid_tuning .features'));
        }

        // translate to user-selected language
        localize();

        // Local cache of current rates
        self.currentRates = {
            roll_rate:   RC_tuning.roll_rate,
            pitch_rate:  RC_tuning.pitch_rate,
            yaw_rate:    RC_tuning.yaw_rate,
            rc_rate:     RC_tuning.RC_RATE,
            rc_rate_yaw: RC_tuning.rcYawRate,
            rc_expo:     RC_tuning.RC_EXPO,
            rc_yaw_expo: RC_tuning.RC_YAW_EXPO,
            superexpo:   BF_CONFIG.features.isEnabled('SUPEREXPO_RATES')
        };

        if (CONFIG.flightControllerIdentifier !== "BTFL" || semver.lt(CONFIG.flightControllerVersion, "2.8.1")) {
            self.currentRates.rc_rate_yaw = self.currentRates.rc_rate;
        }

        if (semver.lt(CONFIG.apiVersion, "1.7.0")) {
            self.currentRates.roll_rate = RC_tuning.roll_pitch_rate;
            self.currentRates.pitch_rate = RC_tuning.roll_pitch_rate;
        }

        var showAllButton = $('#showAllPids');

        function updatePidDisplay() {
            if (!self.showAllPids) {
                hideUnusedPids();

                showAllButton.text(chrome.i18n.getMessage("pidTuningShowAllPids"));
            } else {
                showAllPids();

                showAllButton.text(chrome.i18n.getMessage("pidTuningHideUnusedPids"));
            }
        }

        updatePidDisplay();

        showAllButton.on('click', function(){
            self.showAllPids = !self.showAllPids;

            updatePidDisplay();
        });

        $('#resetProfile').on('click', function(){
            self.updating = true;
            MSP.promise(MSPCodes.MSP_SET_RESET_CURR_PID).then(function () {
                self.refresh(function () {
                    self.updating = false;

                    GUI.log(chrome.i18n.getMessage('pidTuningProfileReset'));
                });
            });
        });

        $('.tab-pid_tuning select[name="profile"]').change(function () {
            self.currentProfile = parseInt($(this).val());
            self.updating = true;
            MSP.promise(MSPCodes.MSP_SELECT_SETTING, [self.currentProfile]).then(function () {
                self.refresh(function () {
                    self.updating = false;

                    GUI.log(chrome.i18n.getMessage('pidTuningLoadedProfile', [self.currentProfile + 1]));
                });
            });
        });

        if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
            $('.tab-pid_tuning select[name="rate_profile"]').change(function () {
                self.currentRateProfile = parseInt($(this).val());
                self.updating = true;
                MSP.promise(MSPCodes.MSP_SELECT_SETTING, [self.currentRateProfile + self.RATE_PROFILE_MASK]).then(function () {
                    self.refresh(function () {
                        self.updating = false;

                        GUI.log(chrome.i18n.getMessage('pidTuningLoadedRateProfile', [self.currentRateProfile + 1]));
                    });
                });
            });

            var ptermNumberElement = $('input[name="ptermSetpoint-number"]');
            var ptermRangeElement = $('input[name="ptermSetpoint-range"]');
            ptermNumberElement.change(function () {
                ptermRangeElement.val($(this).val());
            });
            ptermRangeElement.change(function () {
                ptermNumberElement.val($(this).val());
            });

            var dtermNumberElement = $('input[name="dtermSetpoint-number"]');
            var dtermRangeElement = $('input[name="dtermSetpoint-range"]');
            dtermNumberElement.change(function () {
                dtermRangeElement.val($(this).val());
            });
            dtermRangeElement.change(function () {
                dtermNumberElement.val($(this).val());
            });
        } else {
            $('.tab-pid_tuning .rate_profile').hide();

            $('#pid-tuning .rcInterpolation').hide();
            $('#pid-tuning .rcInterpolationInterval').hide();

            $('#pid-tuning .ptermSetpoint').hide();
            $('#pid-tuning .dtermSetpoint').hide();
        }
        
        if (!semver.gte(CONFIG.flightControllerVersion, "2.8.2")) {
            $('#pid-tuning .delta').hide();
            $('.tab-pid_tuning .note').hide();
		}

        $('.pid_tuning tr').each(function(){
          for(i = 0; i < PID_names.length; i++) {
            if($(this).hasClass(PID_names[i])) {
              $(this).find('td:first').text(PID_names[i]);
            }
          }
        });

        pid_and_rc_to_form();

        var pidController_e = $('select[name="controller"]');

        var pidControllerList;

        if (semver.lt(CONFIG.apiVersion, "1.14.0")) {
            pidControllerList = [
                { name: "MultiWii (Old)"},
                { name: "MultiWii (rewrite)"},
                { name: "LuxFloat"},
                { name: "MultiWii (2.3 - latest)"},
                { name: "MultiWii (2.3 - hybrid)"},
                { name: "Harakiri"}
            ]
        } else if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
            pidControllerList = [
                { name: "Legacy"},
                { name: "Betaflight"},
            ]
        } else {
            pidControllerList = [
                { name: ""},
                { name: "Integer"},
                { name: "Float"},
            ]
        }

        for (var i = 0; i < pidControllerList.length; i++) {
            pidController_e.append('<option value="' + (i) + '">' + pidControllerList[i].name + '</option>');
        }

        if (semver.gte(CONFIG.apiVersion, CONFIGURATOR.pidControllerChangeMinApiVersion)) {
            pidController_e.val(PID.controller);

			self.updatePidControllerParameters();
        } else {
            GUI.log(chrome.i18n.getMessage('pidTuningUpgradeFirmwareToChangePidController', [CONFIG.apiVersion, CONFIGURATOR.pidControllerChangeMinApiVersion]));

            pidController_e.empty();
            pidController_e.append('<option value="">Unknown</option>');

            pidController_e.prop('disabled', true);
        }

        if (semver.lt(CONFIG.apiVersion, "1.7.0")) {
            $('.tpa .tpa-breakpoint').hide();

            $('.pid_tuning .roll_rate').hide();
            $('.pid_tuning .pitch_rate').hide();
        } else {
            $('.pid_tuning .roll_pitch_rate').hide();
        }

        if (useLegacyCurve) {
            $('.new_rates').hide();
        }

        // Getting the DOM elements for curve display
        var rcCurveElement = $('.rate_curve canvas').get(0);
        var curveContext = rcCurveElement.getContext("2d");
        rcCurveElement.width = 1000;
        rcCurveElement.height = 1000;

        var maxAngularVelRollElement = $('.rc_curve .maxAngularVelRoll');
        var maxAngularVelPitchElement = $('.rc_curve .maxAngularVelPitch');
        var maxAngularVelYawElement = $('.rc_curve .maxAngularVelYaw');

        var updateNeeded = true;

        function updateRates(event) {
            setTimeout(function () { // let global validation trigger and adjust the values first
                var targetElement = $(event.target),
                    targetValue = checkInput(targetElement);

                if (self.currentRates.hasOwnProperty(targetElement.attr('name')) && targetValue) {
                    self.currentRates[targetElement.attr('name')] = targetValue;

                    updateNeeded = true;
                }

                if (targetElement.attr('name') === 'rc_rate' && CONFIG.flightControllerIdentifier !== "BTFL" || semver.lt(CONFIG.flightControllerVersion, "2.8.1")) {
                    self.currentRates.rc_rate_yaw = targetValue;
                }

                if (targetElement.attr('name') === 'roll_pitch_rate' && semver.lt(CONFIG.apiVersion, "1.7.0")) {
                    self.currentRates.roll_rate = targetValue;
                    self.currentRates.pitch_rate = targetValue;

                    updateNeeded = true;
                }

                if (targetElement.attr('name') === 'SUPEREXPO_RATES') {
                    self.currentRates.superexpo = targetElement.is(':checked');

                    updateNeeded = true;
                }

                if (updateNeeded) {
                    var curveHeight = rcCurveElement.height;
                    var curveWidth = rcCurveElement.width;

		    var maxAngularVel = Math.max(
                        printMaxAngularVel(self.currentRates.roll_rate, self.currentRates.rc_rate, self.currentRates.rc_expo, self.currentRates.superexpo, maxAngularVelRollElement),
                        printMaxAngularVel(self.currentRates.pitch_rate, self.currentRates.rc_rate, self.currentRates.rc_expo, self.currentRates.superexpo, maxAngularVelPitchElement),
                        printMaxAngularVel(self.currentRates.yaw_rate, self.currentRates.rc_rate_yaw, self.currentRates.rc_yaw_expo, self.currentRates.superexpo, maxAngularVelYawElement));

                    curveContext.clearRect(0, 0, curveWidth, curveHeight);

                    if (!useLegacyCurve) {
                        drawAxes(curveContext, curveWidth, curveHeight, (curveHeight / 2) / maxAngularVel * 360);
                    }

                    curveContext.lineWidth = 4;

		    drawCurve(self.currentRates.roll_rate, self.currentRates.rc_rate, self.currentRates.rc_expo, self.currentRates.superexpo, maxAngularVel, '#ff0000', 0, curveContext);

		    drawCurve(self.currentRates.pitch_rate, self.currentRates.rc_rate, self.currentRates.rc_expo, self.currentRates.superexpo, maxAngularVel, '#00ff00', -4, curveContext);

		    drawCurve(self.currentRates.yaw_rate, self.currentRates.rc_rate_yaw, self.currentRates.rc_yaw_expo, self.currentRates.superexpo, maxAngularVel, '#0000ff', 4, curveContext);

                    updateNeeded = false;
                }
            }, 0);
        };

        // UI Hooks
        // curves
        $('.pid_tuning').on('input change', updateRates);
        $('input.feature').on('input change', updateRates).trigger('input');

        $('.throttle input').on('input change', function () {
            setTimeout(function () { // let global validation trigger and adjust the values first
                var throttleMidE = $('.throttle input[name="mid"]'),
                    throttleExpoE = $('.throttle input[name="expo"]'),
                    mid = parseFloat(throttleMidE.val()),
                    expo = parseFloat(throttleExpoE.val()),
                    throttleCurve = $('.throttle .throttle_curve canvas').get(0),
                    context = throttleCurve.getContext("2d");

                // local validation to deal with input event
                if (mid >= parseFloat(throttleMidE.prop('min')) &&
                    mid <= parseFloat(throttleMidE.prop('max')) &&
                    expo >= parseFloat(throttleExpoE.prop('min')) &&
                    expo <= parseFloat(throttleExpoE.prop('max'))) {
                    // continue
                } else {
                    return;
                }

                var canvasHeight = throttleCurve.height;
                var canvasWidth = throttleCurve.width;

                // math magic by englishman
                var midx = canvasWidth * mid,
                    midxl = midx * 0.5,
                    midxr = (((canvasWidth - midx) * 0.5) + midx),
                    midy = canvasHeight - (midx * (canvasHeight / canvasWidth)),
                    midyl = canvasHeight - ((canvasHeight - midy) * 0.5 *(expo + 1)),
                    midyr = (midy / 2) * (expo + 1);

                // draw
                context.clearRect(0, 0, canvasWidth, canvasHeight);
                context.beginPath();
                context.moveTo(0, canvasHeight);
                context.quadraticCurveTo(midxl, midyl, midx, midy);
                context.moveTo(midx, midy);
                context.quadraticCurveTo(midxr, midyr, canvasWidth, 0);
                context.lineWidth = 2;
                context.strokeStyle = '#ffbb00';
                context.stroke();
            }, 0);
        }).trigger('input');

        $('a.refresh').click(function () {
            self.refresh(function () {
                GUI.log(chrome.i18n.getMessage('pidTuningDataRefreshed'));
            });
        });

        $('#pid-tuning').find('input').each(function (k, item) {
            if ($(item).attr('class') !== "feature toggle"
                && $(item).attr('class') !== "nonProfile") {
                $(item).change(function () {
                    self.setDirty(true);
                });
            }
        });

        if (semver.gte(CONFIG.flightControllerVersion, "2.8.2")) {
            $('#pid-tuning .delta select').change(function() {
                self.setDirty(true);
            });
        }

        pidController_e.change(function () {
            self.setDirty(true);

			self.updatePidControllerParameters();
        });

        if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
            $('select[name="rcInterpolation-select"]').change(function () {
                self.updateRcInterpolationParameters();
            });
        }

        // update == save.
        $('a.update').click(function () {
            form_to_pid_and_rc();

            self.updating = true;
            Promise.resolve(true)
            .then(function () {
                var promise;
                if (semver.gte(CONFIG.apiVersion, CONFIGURATOR.pidControllerChangeMinApiVersion)) {
                    PID.controller = pidController_e.val();
                    promise = MSP.promise(MSPCodes.MSP_SET_PID_CONTROLLER, mspHelper.crunch(MSPCodes.MSP_SET_PID_CONTROLLER));
                }
                return promise;
            }).then(function () {
                return MSP.promise(MSPCodes.MSP_SET_PID, mspHelper.crunch(MSPCodes.MSP_SET_PID));
            }).then(function () {
                if (semver.gte(CONFIG.flightControllerVersion, "2.9.0") && semver.lt(CONFIG.flightControllerVersion, "3.0.0")) {
                  return MSP.promise(MSPCodes.MSP_SET_SPECIAL_PARAMETERS, mspHelper.crunch(MSPCodes.MSP_SET_SPECIAL_PARAMETERS));
                }
            }).then(function () {
                if (semver.gte(CONFIG.flightControllerVersion, "2.8.2")) {
                  return MSP.promise(MSPCodes.MSP_SET_PID_ADVANCED, mspHelper.crunch(MSPCodes.MSP_SET_PID_ADVANCED));
                }
            }).then(function () {
                if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
                  return MSP.promise(MSPCodes.MSP_SET_RX_CONFIG, mspHelper.crunch(MSPCodes.MSP_SET_RX_CONFIG));
                }
            }).then(function () {
                if (semver.gte(CONFIG.flightControllerVersion, "2.8.1")) {
                    return MSP.promise(MSPCodes.MSP_SET_FILTER_CONFIG, mspHelper.crunch(MSPCodes.MSP_SET_FILTER_CONFIG));
                }
            }).then(function () {
                return MSP.promise(MSPCodes.MSP_SET_RC_TUNING, mspHelper.crunch(MSPCodes.MSP_SET_RC_TUNING));
            }).then(function () {
                if (semver.gte(CONFIG.flightControllerVersion, "2.8.0")) {
                    return MSP.promise(MSPCodes.MSP_SET_BF_CONFIG, mspHelper.crunch(MSPCodes.MSP_SET_BF_CONFIG));
                }
            }).then(function () {
                return MSP.promise(MSPCodes.MSP_EEPROM_WRITE);
            }).then(function () {
                self.updating = false;
                self.setDirty(false);

                GUI.log(chrome.i18n.getMessage('pidTuningEepromSaved'));
            });
        });

        // Setup model for rates preview
        self.initRatesPreview();
        self.renderModel();

        self.updating = false;

        // enable RC data pulling for rates preview
        GUI.interval_add('receiver_pull', self.getRecieverData, true);

        // status data pulled via separate timer with static speed
        GUI.interval_add('status_pull', function status_pull() {
            MSP.send_message(MSPCodes.MSP_STATUS);
        }, 250, true);

        GUI.content_ready(callback);
    }
};

TABS.pid_tuning.getRecieverData = function () {
    MSP.send_message(MSPCodes.MSP_RC, false, false);
};

TABS.pid_tuning.initRatesPreview = function () {
    this.keepRendering = true;
    this.model = new Model($('.rates_preview'), $('.rates_preview canvas'));

    $(window).on('resize', $.proxy(this.model.resize, this.model));
};

TABS.pid_tuning.renderModel = function () {
    if (this.keepRendering) { requestAnimationFrame(this.renderModel.bind(this)); }

    if (!this.clock) { this.clock = new THREE.Clock(); }

    if (RC.channels[0] && RC.channels[1] && RC.channels[2]) {
        var delta = this.clock.getDelta();

        var roll  = delta * this.rateCurve.rcCommandRawToDegreesPerSecond(RC.channels[0], this.currentRates.roll_rate,  this.currentRates.rc_rate,     this.currentRates.rc_expo,     this.currentRates.super_expo),
            pitch = delta * this.rateCurve.rcCommandRawToDegreesPerSecond(RC.channels[1], this.currentRates.pitch_rate, this.currentRates.rc_rate,     this.currentRates.rc_expo,     this.currentRates.super_expo),
            yaw   = delta * this.rateCurve.rcCommandRawToDegreesPerSecond(RC.channels[2], this.currentRates.yaw_rate,   this.currentRates.rc_rate_yaw, this.currentRates.rc_yaw_expo, this.currentRates.super_expo);

        this.model.rotateBy(-degToRad(pitch), -degToRad(yaw), -degToRad(roll));
    }
};

TABS.pid_tuning.cleanup = function (callback) {
    var self = this;

    if (self.model) {
        $(window).off('resize', $.proxy(self.model.resize, self.model));
    }

    self.keepRendering = false;

    if (callback) callback();
};

TABS.pid_tuning.refresh = function (callback) {
    var self = this;

    GUI.tab_switch_cleanup(function () {
        self.initialize();

        self.setDirty(false);

        if (callback) {
            callback();
        }
    });
}

TABS.pid_tuning.setProfile = function () {
    var self = this;

    self.currentProfile = CONFIG.profile;
    $('.tab-pid_tuning select[name="profile"]').val(self.currentProfile);
}

TABS.pid_tuning.setRateProfile = function () {
    var self = this;

    self.currentRateProfile = CONFIG.rateProfile;
    $('.tab-pid_tuning select[name="rate_profile"]').val(self.currentRateProfile);
}

TABS.pid_tuning.setDirty = function (isDirty) {
    var self = this;

    self.dirty = isDirty;
    $('.tab-pid_tuning select[name="profile"]').prop('disabled', isDirty);
    if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
        $('.tab-pid_tuning select[name="rate_profile"]').prop('disabled', isDirty);
    }
}

TABS.pid_tuning.checkUpdateProfile = function (updateRateProfile) {
    var self = this;

    if (GUI.active_tab === 'pid_tuning') {
        if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")
            && CONFIG.numProfiles === 2) {
            $('.tab-pid_tuning select[name="profile"] .profile3').hide();
        }

        if (!self.updating && !self.dirty) {
            var changedProfile = false;
            if (self.currentProfile !== CONFIG.profile) {
                self.setProfile();

                changedProfile = true;
            }

            var changedRateProfile = false;
            if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")
                && updateRateProfile
                && self.currentRateProfile !== CONFIG.rateProfile) {
                self.setRateProfile();

                changedRateProfile = true;
            }

            if (changedProfile || changedRateProfile) {
                self.refresh(function () {
                    if (changedProfile) {
                        GUI.log(chrome.i18n.getMessage('pidTuningReceivedProfile', [CONFIG.profile + 1]));
                    }

                    if (changedRateProfile) {
                        GUI.log(chrome.i18n.getMessage('pidTuningReceivedRateProfile', [CONFIG.rateProfile + 1]));
                    }
                });
            }
        }
    }
}

TABS.pid_tuning.updatePidControllerParameters = function () {
    if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
        if ($('.tab-pid_tuning select[name="controller"]').val() === '0') {
            $('.pid_tuning .YAW_JUMP_PREVENTION').show();

            $('#pid-tuning .delta').show();

            $('#pid-tuning .ptermSetpoint').hide();
            $('#pid-tuning .dtermSetpoint').hide();
        } else {
            $('.pid_tuning .YAW_JUMP_PREVENTION').hide();

            $('#pid-tuning .ptermSetpoint').show();
            $('#pid-tuning .dtermSetpoint').show();

            $('#pid-tuning .delta').hide();
        }
    }
}

TABS.pid_tuning.updateRcInterpolationParameters = function () {
    if (semver.gte(CONFIG.flightControllerVersion, "3.0.0")) {
        if ($('select[name="rcInterpolation-select"]').val() === '3') {
            $('#pid-tuning .rcInterpolationInterval').show();
        } else {
            $('#pid-tuning .rcInterpolationInterval').hide();
        }
    }
}