var PID = {
    TS: 0,
    FUEL_PRESSURE: 0x10A,
	SPEED: 0x10d,
	RPM: 0x10c,
	ENGINE_LOAD: 0x104,
	THROTTLE: 0x111,
    COOLANT_TEMP: 0x105,
    TIMING_ADVANCE: 0x10E,
	INTAKE_TEMP: 0x10F,
	PID_DISTANCE: 0x131,
	PID_BAROMETRIC: 0x133,
	PID_AMBIENT_TEMP: 0x146,
	PID_FUEL_RATE: 0x15E,
	GPS : {
		LATITUDE: 0xA,
		LONGITUDE: 0xB,
		ALTITUDE: 0xC,
		SPEED: 0xD,
		HEADING: 0xE,
		SAT_COUNT: 0xF,
		TIME: 0x10,
        DATE: 0x11,
        HDOP: 0x12
	},
	ACC: 0x20,
	GYRO: 0x21,
	COMPASS: 0x22,
	MEMS_TEMP: 0x23,
	BATTERY_VOLTAGE: 0x24,
	ORIENTATION: 0x25,
	TRIP_DISTANCE: 0x30,
    DEVICE_TEMP: 0x82,
    HALL_SENSOR: 0x83,
	getName: function(pid)
	{
		switch (pid) {
		case this.SPEED:
			return "Vehicle Speed";
		case this.RPM:
			return "Engine RPM";
        case this.FUEL_PRESSURE:
            return "Fuel Pressure";
        case this.TIMING_ADVANCE:
            return "Timing Advance";
        case this.ENGINE_LOAD:
			return "Engine Load";
		case this.THROTTLE:
			return "Throttle Position";
		case this.COOLANT_TEMP:
			return "Coolant Temp.";
		case this.INTAKE_TEMP:
		    return "Intake Temp.";
        case this.PID_AMBIENT_TEMP:
            return "Ambient Temp.";
        case this.PID_BAROMETRIC:
            return "Barometric";
        case this.PID_DISTANCE:
            return "Distance Since Service";
        case this.PID_FUEL_RATE:
            return "Fuel Rate";
		case this.BATTERY_VOLTAGE:
			return "Battery Voltage";
		case this.TRIP_DISTANCE:
			return "Trip Distance";
		case this.DEVICE_TEMP:
			return "Device Temp.";
		case this.ACC:
			return "Acceleration";
		case this.ORIENTATION:
			return "Orientation";
		case this.GPS.LATITUDE:
			return "Latitude";
		case this.GPS.LONGITUDE:
			return "Longitude";
		case this.GPS.ALTITUDE:
			return "Altitude";
		case this.GPS.SPEED:
			return "Speed";
		case this.GPS.HEADING:
			return "Course";
		case this.GPS.SAT_COUNT:
			return "Satellites in Use";
		case this.GPS.TIME:
			return "UTC Time";
		case this.GPS.DATE:
            return "UTC Date";
        case this.GPS.HDOP:
            return "HDOP";
        case this.HALL_SENSOR:
            return "Hall Sensor";
        default:
            return "PID " + (pid.toString(16));
		}
    },
    getUnit: function (pid) {
        switch (pid) {
            case this.SPEED:
                return "km/h";
            case this.RPM:
                return "rpm";
            case this.FUEL_PRESSURE:
                return "kPa";
            case this.ENGINE_LOAD:
            case this.THROTTLE:
                return "%";
            case this.COOLANT_TEMP:
            case this.INTAKE_TEMP:
            case this.PID_AMBIENT_TEMP:
            case this.DEVICE_TEMP:
                return "°C";
            case this.PID_BAROMETRIC:
                return "bar";
            case this.PID_DISTANCE:
                return "km";
            case this.PID_FUEL_RATE:
                return "L/hr";
            case this.BATTERY_VOLTAGE:
                return "V";
            case this.TRIP_DISTANCE:
                return "km";
            case this.ACC:
                return "g";
            case this.ORIENTATION:
                return "yaw/pitch/roll";
            case this.GPS.ALTITUDE:
                return "m";
            case this.GPS.SPEED:
                return "km/h";
            case this.GPS.HEADING:
            case this.TIMING_ADVANCE:
                return "°";
            default:
                return null;
        }
    },
    getNameUnit: function (pid) {
        var s = this.getName(pid);
        var unit = this.getUnit(pid);
        if (unit) s += " (" + unit + ")";
        return s;
    },
	getUTCTime: function (t)
	{
		var hours   = Math.floor(t / 1000000);
		var minutes = Math.floor((t % 1000000) / 10000);
		var seconds = Math.floor((t % 10000) / 100);
		var ms = t % 100;
		if (hours   < 10) {hours   = "0"+hours;}
		if (minutes < 10) {minutes = "0"+minutes;}
		if (seconds < 10) {seconds = "0"+seconds;}
		if (ms < 10) {ms = "0"+ms;}
		return hours+':'+minutes+':'+seconds+'.'+ms;
	},
	getUTCDate: function (d)
	{
		var day = Math.floor(d / 10000);
		var mon = Math.floor((d % 10000) / 100);
		var year = d % 100; 
		return "20" + year + "-" + mon + "-" + day;
	},
	getXYZ: function(d)
	{
		if (d.length == 3) {
		    return (d[0] / 100).toFixed(1) + "/" + (d[1] / 100).toFixed(1) + "/" + (d[2] / 100).toFixed(1);
		} else {
			return d;
		}
	},
	getXYZComposed: function(d)
	{
		if (d.length == 3) {
			return (d[0] / 100) ^ 2  + (d[1] / 100) ^ 2 + (d[2] / 100) ^ 2;
		} else {
			return 0;
		}
	},
	normalize: function (pid, value)
	{
		switch (pid) {
			case this.BATTERY_VOLTAGE:
				return value / 100;
			case this.TRIP_DISTANCE:
				return (value / 1000).toFixed(1);
			case this.GPS.TIME:
				return this.getUTCTime(value);
			case this.GPS.DATE:
				return this.getUTCDate(value);
			case this.ACC:
			case this.GYRO:
			case this.COMPASS:
			case this.ORIENTATION:
				return this.getXYZ(value);
			case this.GPS.LATITUDE:
			case this.GPS.LONGITUDE:
                return parseFloat(value);
            case this.GPS.ALTITUDE:
                return value;   /* m */
            case this.GPS.SPEED:
                return parseFloat(value); /* kph */
		}
		return value;
	},
	toNumber: function (pid, value)
	{
		switch (pid) {
			case this.BATTERY_VOLTAGE:
				return value / 100;
			case this.TRIP_DISTANCE:
				return value / 1000;
			case this.GPS.ALTITUDE:
				return value;
			case this.ACC:
			case this.GYRO:
				return this.getXYZComposed(value);
		}
		return typeof value != "number" ? parseFloat(value) : value;
	},
	illustratable: function(pid)
	{
		switch (pid) {
		case 0:
		case PID.GYRO:
		case PID.COMPASS:
		case PID.ORIENTATION:
		case PID.GPS.LATITUDE:
		case PID.GPS.LONGITUDE:
		case PID.GPS.HEADING:
		case PID.GPS.TIME:
		case PID.GPS.DATE:
			return false;
		}
		return true;
	}
};