/*
  ______ _       _______     _______ 
 |  ____| |     / ____\ \   / / ____|
 | |__  | |    | (___  \ \_/ / (___  
 |  __| | |     \___ \  \   / \___ \ 
 | |____| |____ ____) |  | |  ____) |
 |______|______|_____/   |_| |_____/ 
 
  ELSYS simple payload decoder. 
  Use it as it is or remove the bugs
  www.elsys.se
  peter@elsys.se
*/
const TYPE_TEMP    	=0x01; //temp 2 bytes -3276.8°C -->3276.7°C
const TYPE_RH		=0x02; //Humidity 1 byte  0-100%
const TYPE_ACC		=0x03; //acceleration 3 bytes X,Y,Z -128 --> 127 +/-63=1G
const TYPE_LIGHT	=0x04; //Light 2 bytes 0-->65535 Lux
const TYPE_MOTION	=0x05; //No of motion 1 byte  0-255
const TYPE_CO2		=0x06; //Co2 2 bytes 0-65535 ppm 
const TYPE_VDD		=0x07; //VDD 2byte 0-65535mV
const TYPE_ANALOG1  =0x08; //VDD 2byte 0-65535mV
const TYPE_GPS      =0x09; //3bytes lat 3bytes long binary
const TYPE_PULSE1   =0x0A; //2bytes relative pulse count
function bin16dec(bin) {
    var num=bin&0xFFFF;
    if (0x8000 & num)
        num = - (0x010000 - num);
    return num;
}
function bin8dec(bin) {
    var num=bin&0xFF;
    if (0x80 & num) 
        num = - (0x0100 - num);
    return num;
}
function hexToBytes(hex) {
    for (var bytes = [], c = 0; c < hex.length; c += 2)
        bytes.push(parseInt(hex.substr(c, 2), 16));
    return bytes;
}
function DecodeElsysPayload(data){
    var obj = new Object();
    for(i=0;i<data.length;i++){
        console.log(data[i]);
        switch(data[i]){
            case TYPE_TEMP: //Temperature
                var temp=(data[i+1]<<8)|(data[i+2]);
                temp=bin16dec(temp);
                obj.temperature=temp;
                i+=2;
            break
            case TYPE_RH: //Humidity
                var rh=(data[i+1]);
                obj.humidity=rh;
                i+=1;
            break
            case TYPE_ACC: //Acceleration
                obj.x=bin8dec(data[i+1]);
                obj.y=bin8dec(data[i+2]);
                obj.z=bin8dec(data[i+3]);
                i+=3;
            break
            case TYPE_LIGHT: //Light
                var light=(data[i+1]<<8)|(data[i+2]);
                obj.light=light;
                i+=2;
            break
            case TYPE_MOTION: //Motion sensor(PIR)
                var motion=(data[i+1]);
                obj.motion=motion;
                i+=1;
            break
            case TYPE_CO2: //CO2
                var co2=(data[i+1]<<8)|(data[i+2]);
                obj.co2=co2;
                i+=2;
            break
            case TYPE_VDD: //Battery level
                var vdd=(data[i+1]<<8)|(data[i+2]);
                obj.vdd=vdd;
                i+=2;
            break
            case TYPE_ANALOG1: //Analog input 1
                var analog1=(data[i+1]<<8)|(data[i+2]);
                obj.analog1=analog1;
                i+=2;
            break
            case TYPE_GPS: //gps
                obj.lat=(data[i+1]<<16)|(data[i+2]<<8)|(data[i+3]);
                obj.long=(data[i+4]<<16)|(data[i+5]<<8)|(data[i+6]);
                i+=6;
            break
            case TYPE_PULSE1: //Pulse input 1
                var pulse1=(data[i+1]<<8)|(data[i+2]);
                obj.pulse1=pulse1;
                i+=2;
            break
        }
    }
    return obj;
}
$(function() {
    $("#convert").click(function() {
        console.log("click");
        var res=DecodeElsysPayload(hexToBytes($('#inputData').val()));
        var json=JSON.stringify(res,null,4);
        $('#result').html(json);
    });
});