/*
To do:
  -flight log
  -statistics page
  -navigation
*/

getAltitude = (p,baseP) => (44330 * (1.0 - Math.pow(p/baseP, 0.1903)));
getFL = () => (44330 * (1.0 - Math.pow(pressure/1013.25, 0.1903))).toFixed(0);
getTimeString = () => (settings.localTime) ? (require("locale").time(Date(),1)):(Date().toUTCString().slice(Date().toUTCString().length-12,Date().toUTCString().length-7));
takeoff = () => {takeoffTime=Date().getTime(); flying=true; landed=false;};
land = () => {landingTime=Date().getTime(); flying=false; landed=true;};

var fg=g.getColor();
var bg=g.getBgColor();
var red="#F00",green="#0F0";

const unitsRoc=[
  {name:"m/s", factor:1, precision:1, layoutCode:{type:"v", halign:1, c: [
            {type:"txt", font:"12%", halign:0, filly:0, label:"m"},
            {type:"", height:1,width:"20", bgCol:fg},
            {type:"txt", font:"12%", halign:0, filly:0, label:"s"}]}},
  {name:"ft/m", factor:196.85039370078738, precision:0, layoutCode:{type:"v", halign:1, c: [
            {type:"txt", font:"12%", halign:0, filly:0, label:"ft"},
            {type:"", height:1,width:"30", bgCol:fg},
            {type:"txt", font:"12%", halign:0, filly:0, label:"min"}]}},
  {name:"kt", factor:1.9438444924406, precision:1, layoutCode:
            {type:"txt", font:"12%", halign:0, filly:0, label:"kt"}}
  ];

const unitsGs=[
  {name:"km/h", factor:1, precision:1, layoutCode:{type:"v", halign:1, c: [
            {type:"txt", font:"12%", halign:0, filly:0, label:"km"},
            {type:"", height:1,width:"30", bgCol:fg},
            {type:"txt", font:"12%", halign:0, filly:0, label:"h"}]}},
  {name:"kt", factor:0.5399568, precision:0, layoutCode:{type:"txt", font:"12%", halign:0, filly:0, label:"kt"}},
  {name:"m/s", factor:0.2777777777777778, precision:1, layoutCode:{type:"v", halign:1, c: [
            {type:"txt", font:"12%", halign:0, filly:0, label:"m"},
            {type:"", height:1,width:"20", bgCol:fg},
            {type:"txt", font:"12%", halign:0, filly:0, label:"s"}]}}
  ];

const unitsAlt=[
  {name:"m", factor:1, precision:0, layoutCode:{type:"txt", font:"12%", halign:0, filly:0, label:"m"}},
  {name:"ft", factor:3.280839895013123, precision:0, layoutCode:{type:"txt", font:"12%", halign:0, filly:0, label:"ft"}}
  ];

const unitROC={type:"v", halign:1, c: [
            {type:"txt", font:"12%", halign:0, filly:0, label:"m"},
            {type:"", height:1,width:"20", bgCol:fg},
            {type:"txt", font:"12%", halign:0, filly:0, label:"s"}
          ]};

var settings = Object.assign({
  rocU: 0,
  altU: 0,
  gsU:0,
  intTime:10,
  localTime:true,
  autoDetect:1
}, require('Storage').readJSON("tinyVario.json", true) || {});

var qnh=Math.floor(Bangle.getOptions().seaLevelPressure);
var pfdHandle;
var rawP=0, samples=0;
var altH = [];
var altRaw=-9999, altFast=0, altSlow=0;
var fastGain=0.5, slowGain=0.3;
var roc=0,rocAvg=0, gs;
var lastPressure = Date.now();
var pressure = 1000;
var flying=false, landed=false;
var takeoffTime, landingTime, flyingTime;
var Layout = require("Layout");
var oldSettings;


function updateText(t) {
  g.clearRect(t.x,t.y,t.x+t.w-1,t.y+t.h-1);
  if (t.col) g.setColor(t.col);
  else g.setColor(fg);
  if (t.halign==1)
    g.setFont(t.font).setFontAlign(1,0,0).drawString(t.label, t.x+t.w, t.y+(t.h>>1));
  else if (t.halign==-1)
    g.setFont(t.font).setFontAlign(-1,0,0).drawString(t.label, t.x, t.y+(t.h>>1));
  else
    g.setFont(t.font).setFontAlign(0,0,0).drawString(t.label, t.x+(t.w>>1), t.y+(t.h>>1));
}

function initPFD() {
  Bangle.setUI();
  var pfd = new Layout(
    {type:"v",c: [
      /*{type:"h",c: [
        {type:"", fillx:1, height:"1"}
        ]},*/
      {type:"h",filly:1, c: [
        {type:"custom", width:"25", render:()=>{
          var p = pfd.vario;
          g.reset();
          g.clearRect(p.x,p.y,p.x+p.w-1,p.y+p.h-1);
          if (roc>0.1) g.setColor(0,1,0);
          if (roc<-1) g.setColor(1,0,0);
          var y=p.y+p.h/2-roc*(p.h/2)/5;
          g.fillRect(p.x,p.y+(p.h/2),p.x+p.w-1,Math.clip(y,p.y,p.y+p.h-1));
        }, id:"vario",filly:1 },
        {type:"", filly:1, width:1, bgCol:fg},
        {type:"v",fillx:1, c: [
          {type:"h", halign:1, c:[
            {type:"txt", font:"22%", halign:1, filly:1, fillx:1, label:"9999", id:"alt", cb:()=>initAltMenu()},
            unitsAlt[settings.altU].layoutCode
          ]},
          {type:"", fillx:1, height:"1", bgCol:fg},
          {type:"h", halign:1, c:[
            {type:"txt", font:"25%", halign:1, filly:1, fillx:1, label:"-9.9", id:"avg", cb:()=>initAvgMenu()},
            unitsRoc[settings.rocU].layoutCode
          ]},
          {type:"", fillx:1, height:"1", bgCol:fg},
          {type:"h", halign:1, c:[
            {type:"txt", font:"25%", halign:1, filly:1, fillx:1, label:"XXX", id:"gs", cb:()=>initGsMenu()},
            unitsGs[settings.gsU].layoutCode
          ]}
        ]}
      ]},
      {type:"", fillx:1, height:"1", bgCol:fg},
      {type:"h",c: [
        {type:"txt",pad:0, halign:0, font:"15%",fillx:1, label:"99:99", id:"time", cb:()=>initTimeMenu()},
        {type:"", width:1,height:g.getHeight()*0.15, bgCol:fg},
        {type:"txt",pad:0, halign:0, font:"15%", fillx:1, label:"--:--", id:"flyingtime", cb:()=>initFlyingTimeMenu() }
      ]}
    ]},{lazy:true}
  );
  g.clear();
  pfd.render();
  //-------testing------
  //rawP=1000;
  //samples=1;
  //--------------------
  pfdHandle = setInterval(function() {
    //process pressure readings
    if (samples) {
      pressure=rawP/samples;
      samples=0;
      rawP=0;
      if (altRaw==-9999) {//first measurement)
        altRaw=getAltitude(pressure,qnh);
        altFast=altRaw;
        altSlow=altRaw;
        for (let i = 0; i < settings.intTime*4+1; i++) altH.push(altRaw);
      }
    }
    altRaw=getAltitude(pressure,qnh);
    altFast=altFast+(altRaw-altFast)*fastGain;
    altSlow=altSlow+(altRaw-altSlow)*slowGain;
    altH.push(altRaw);
    while (altH.length>settings.intTime*4+1) {
      altH.shift();
      rocAvg=(altH[altH.length-1]-altH[0])/settings.intTime;
    }

    if (settings.autoDetect) 
      if ((!flying) && (!landed) && ((rocAvg>1) || (rocAvg<-1) || (gs>10))) 
        takeoff();
      else if ((flying) && ((rocAvg<1) && (rocAvg>-1) && (gs<10))) 
        land();
    
    if (flying) {
      flyingTime=Date().getTime()-takeoffTime;
      pfd.flyingtime.label=(flyingTime / 3600000).toFixed(0)+":"+(flyingTime / 60000 % 60).toFixed(0).padStart(2,'0');
      pfd.flyingtime.col=fg;
      updateText(pfd.flyingtime);
    } else if (landed) {
      flyingTime=landingTime-takeoffTime;
      pfd.flyingtime.label=(flyingTime / 3600000).toFixed(0)+":"+(flyingTime / 60000 % 60).toFixed(0).padStart(2,'0');
      pfd.flyingtime.col=green;
      updateText(pfd.flyingtime);
    }

    roc=(altFast-altSlow)/((0.25/slowGain)-(0.25/fastGain));
    pfd.alt.label=(altRaw*unitsAlt[settings.altU].factor).toFixed(unitsAlt[settings.altU].precision);
    pfd.avg.col=(rocAvg<-1) ? (red):((rocAvg>0.1) ? (green):(fg));
    pfd.avg.label=(rocAvg*unitsRoc[settings.rocU].factor).toFixed(unitsRoc[settings.rocU].precision);

    var gps = Bangle.getGPSFix();
    if (gps) {
      pfd.gs.label=(gps.speed*unitsGs[settings.gsU].factor).toFixed(unitsGs[settings.gsU].precision);
      updateText(pfd.gs);
      gs=gps.speed;
    } 
    
    pfd.time.label=getTimeString();
    updateText(pfd.alt);
    updateText(pfd.avg);
    updateText(pfd.time);
    pfd.vario.render();
  }, 250);

}

function initAltMenu() {
  oldSettings=Object.assign({},settings);
  clearInterval(pfdHandle);
  var altMenu = new Layout ({
    type:"h", c: [{
      type:"v", width:180, c: [
        {type:"btn", font:"12%", pad:2, fillx:1, filly:1, label:"set QNH", cb:()=>initQNHMenu()},
        {type:"btn", font:"12%", id:"units", pad:2, fillx:1, filly:1, label:"Units: "+unitsAlt[settings.altU].name, cb:()=>{
          settings.altU=(settings.altU+1)%unitsAlt.length;
          altMenu.units.label="Units: "+unitsAlt[settings.altU].name;
          altMenu.render();
        }},
      ]},
      {type:"v", c: [
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"BACK", cb: ()=>{
          settings=Object.assign({},oldSettings);
          print("old settings restored");
          initPFD();
        }},
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"SAVE", cb: ()=>{
          require('Storage').writeJSON("tinyVario.json", settings);
          initPFD();
        }}
      ]}
    ], lazy:true});
  g.clear();
  altMenu.render();
}

function initAvgMenu() {
  oldSettings=Object.assign({},settings);
  clearInterval(pfdHandle);
  var avgMenu = new Layout ({
    type:"h", c: [{
      type:"v", width:180, c: [
        {type:"btn", font:"12%", pad:2, fillx:1, filly:1, label:"+", cb:l=>{
          settings.intTime=Math.clip(settings.intTime+1,1,60);
          avgMenu.interval.label="Interval: "+settings.intTime+"s";
          avgMenu.render();
        }},
        {type:"btn", id:"interval", font:"10%", pad:2, fillx:1, filly:1, label:"Interval: "+settings.intTime+"s", cb:()=>{}},
        {type:"btn", font:"12%", pad:2, fillx:1, filly:1, label:"-", cb:l=>{
          settings.intTime=Math.clip(settings.intTime-1,1,60);
          avgMenu.interval.label="Interval: "+settings.intTime+"s";
          avgMenu.render();
        }},
        {type:"btn", font:"12%", id:"units", pad:2, fillx:1, filly:1, label:"Units: "+unitsRoc[settings.rocU].name, cb:()=>{
          settings.rocU=(settings.rocU+1)%unitsRoc.length;
          avgMenu.units.label="Units: "+unitsRoc[settings.rocU].name;
          avgMenu.render();
        }},
      ]},
      {type:"v", c: [
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"BACK", cb: ()=>{
          settings=Object.assign({},oldSettings);
          initPFD();
        }},
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"SAVE", cb: ()=>{
          require('Storage').writeJSON("tinyVario.json", settings);
          initPFD();
        }}
      ]}
    ], lazy:true});
  g.clear();
  avgMenu.render();
}

function initQNHMenu() {
  var oldQnh=qnh;
  function updateQNHMenu() {
    qnhMenu.clear();
    qnhMenu.alt.label=
      (getAltitude(pressure,qnh)*unitsAlt[settings.altU].factor).toFixed(unitsAlt[settings.altU].precision)
      +unitsAlt[settings.altU].name;
    qnhMenu.qnh.label=qnh;
    qnhMenu.render();
  }
  var qnhMenu = new Layout ( {
    type:"h", c: [{
      type:"v", c: [
        {type:"btn", font:"15%", fillx:1, filly:1, label:"+", cb:l=>{qnh++; updateQNHMenu();} },
        {type:"v", c: [
          {type:"h", c: [
            {type:"txt", font:"13%", fillx:1, filly:1, label:"QNH: "},
            {type:"txt", font:"13%", fillx:1, filly:1, id:"qnh", label:"    "},
          ]},
          {type:"h", c: [
            {type:"txt", font:"13%", fillx:1, filly:1, label:"Alt: "},
            {type:"txt", font:"13%", fillx:1, filly:1, id:"alt", label: "      "},
          ]},
          {type:"btn", font:"15%", fillx:1, filly:1, label:"-", cb:l=>{qnh--; updateQNHMenu();} }
        ]}
      ]},
      {type:"v", c: [
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"BACK", cb: ()=>{
          qnh=oldQnh;//=Object.assign({},oldSettings);
          initAltMenu();
        }},
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"SAVE", cb: ()=>{
          var o=Bangle.getOptions();
          o.seaLevelPressure=qnh;
          Bangle.setOptions(o);
          initAltMenu();
        }}
      ]}
  ],lazy:true});
  g.clear();
  qnhMenu.render();
  updateQNHMenu();
}

function initGsMenu() {
  oldSettings=Object.assign({},settings);
  clearInterval(pfdHandle);
  var gsMenu = new Layout ({
    type:"h", c: [
      {type:"btn", font:"20%", id:"units", pad:2, fillx:1, filly:1, label:"Units:\n"+unitsGs[settings.gsU].name, cb:()=>{
        settings.gsU=(settings.gsU+1)%unitsGs.length;
        gsMenu.units.label="Units:\n"+unitsGs[settings.gsU].name;
        gsMenu.render();
      }},
      {type:"v", c: [
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"BACK", cb: ()=>{
          settings=Object.assign({},oldSettings);
          print("old settings restored");
          initPFD();
        }},
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"SAVE", cb: ()=>{
          require('Storage').writeJSON("tinyVario.json", settings);
          initPFD();
        }}
      ]}
    ], lazy:true});
  g.clear();
  gsMenu.render();
}

function initTimeMenu() {
  oldSettings=Object.assign({},settings);
  clearInterval(pfdHandle);
  var timeMenu = new Layout ({
    type:"h", c: [
      {type:"btn", font:"20%", id:"format", pad:2, fillx:1, filly:1, label:"Time:\n"+((settings.localTime==true) ? ("LCL") : ("UTC")), cb:()=>{
        settings.localTime=!settings.localTime;
        timeMenu.format.label="Time:\n"+((settings.localTime==true) ? ("LCL") : ("UTC"));
        timeMenu.render();
      }},
      {type:"v", c: [
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"BACK", cb: ()=>{
          settings=Object.assign({},oldSettings);
          initPFD();
        }},
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"SAVE", cb: ()=>{
          require('Storage').writeJSON("tinyVario.json", settings);
          initPFD();
        }}
      ]}
    ], lazy:true});
  g.clear();
  timeMenu.render();
}

function initTimeMenu() {
  oldSettings=Object.assign({},settings);
  clearInterval(pfdHandle);
  var timeMenu = new Layout ({
    type:"h", c: [
      {type:"btn", font:"20%", id:"format", pad:2, fillx:1, filly:1, label:"Time:\n"+((settings.localTime==true) ? ("LCL") : ("UTC")), cb:()=>{
        settings.localTime=!settings.localTime;
        timeMenu.format.label="Time:\n"+((settings.localTime==true) ? ("LCL") : ("UTC"));
        timeMenu.render();
      }},
      {type:"v", c: [
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"BACK", cb: ()=>{
          settings=Object.assign({},oldSettings);
          initPFD();
        }},
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"SAVE", cb: ()=>{
          require('Storage').writeJSON("tinyVario.json", settings);
          initPFD();
        }}
      ]}
    ], lazy:true});
  g.clear();
  timeMenu.render();
}

function initFlyingTimeMenu() {
  oldSettings=Object.assign({},settings);
  clearInterval(pfdHandle);
  var ftMenu = new Layout (
    {type:"h", c: [
      {type:"v", c: [
        {type:"btn", font:"12%", pad:2, fillx:1, filly:1, label:"Toggle\nAutodetect", cb:()=>{
          settings.autodetect=!settings.autodetect;
          ftMenu.manual.label= (settings.autodetect==true)? 
            ("AUTO"):((flying) ? ("Manual\nLAND") : ("Manual\nTAKE OFF"));
          ftMenu.render();
        }},
        {type:"btn", font:"12%", id:"manual", pad:2, fillx:1, filly:1, label:(settings.autodetect==true)? 
          ("AUTO"):((flying) ? ("Manual\nLAND") : ("Manual\nTAKE OFF")), cb:()=>{
            if (settings.autodetect==false) {
              if (!flying) {
                E.showPrompt("Take off now?").then((v)=> {
                  if (v) {
                    takeoff();
                    initPFD();
                  }
                });
              } else {
                E.showPrompt("Land now?").then((v)=> {
                  if (v) {
                    land();
                    initPFD();
                  }
                });
              }
            }
          }
        },
        {type:"btn", font:"12%", pad:2, fillx:1, filly:1, label:"Reset", cb:()=>{
          E.showPrompt("Reset Flight?").then((v)=> {
            flying=false;
            landed=false;
            initPFD();
          });
        }}
      ]},
      {type:"v", c: [
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"BACK", cb: ()=>{
          settings=Object.assign({},oldSettings);
          initPFD();
        }},
        {type:"btn", r:3, font:"12%", pad:2, filly:1, label:"SAVE", cb: ()=>{
          require('Storage').writeJSON("tinyVario.json", settings);
          initPFD();
        }}
      ]}
    ], lazy:true});
  g.clear();
  ftMenu.render();
}

Bangle.setGPSPower(true, "tinyVario");
Bangle.setBarometerPower(true, "tinyVario");

Bangle.on('pressure', function(e) {
  if (samples<10) { //no need to gather more samples when stuck in a menu
    rawP+=e.pressure;
    samples++;
  }
});

initPFD();