// Korvonnen pasted inside a function
exports.show = function karvonnen(hrmSettings) {
  //This app is an extra feature implementation for the Run.app of the bangle.js. It's called run+
  //The calculation of the Heart Rate Zones is based on the Karvonnen method. It requires to know maximum and minimum heart rates. More precise calculation methods require a lab.
  //Other methods are even more approximative.
  wu.hide();
  let R = Bangle.appRect;
  
  g.reset().clearRect(R);
  
  g.drawLine(40,64,88,52,136,64);
  g.drawLine(88,52,136,64);
  g.drawLine(40,112,88,124);
  g.drawLine(88,124,132,112);
  g.setFont("Vector",20);
  
  //To calculate Heart rate zones, we need to know the heart rate reserve (HRR)
  // HRR = maximum HR - Minimum HR. minhr is minimum hr, maxhr is maximum hr.
  //get the hrr (heart rate reserve).
  // I put random data here, but this has to come as a menu in the settings section so that users can change it.
  let minhr = hrmSettings.min;
  let maxhr = hrmSettings.max;
  
  function calculatehrr(minhr, maxhr) {
    return maxhr - minhr;}
  
  //test input for hrr (it works).
  let hrr = calculatehrr(minhr, maxhr);
  console.log(hrr);
  
  //Test input to verify the zones work. The following value for "hr" has to be deleted and replaced with the Heart Rate Monitor input.
  let hr = 174;
  let hr1 = hr;
  // These letiables display next and previous HR zone.
  //get the hrzones right. The calculation of the Heart rate zones here is based on the Karvonnen method
  //60-70% of HRR+minHR = zone2. //70-80% of HRR+minHR = zone3. //80-90% of HRR+minHR = zone4. //90-99% of HRR+minHR = zone5. //=>99% of HRR+minHR = serious risk of heart attack
  let minzone2 = hrr * 0.6 + minhr;
  let maxzone2 = hrr * 0.7 + minhr;
  let maxzone3 = hrr * 0.8 + minhr;
  let maxzone4 = hrr * 0.9 + minhr;
  let maxzone5 = hrr * 0.99 + minhr;
  
  // HR data: large, readable, in the middle of the screen
  g.setFont("Vector",50);
  g.drawString(hr1, 62,66);
  //These functions call arcs to show different HR zones.
  
  //To shorten the code, I'll reference some letiables and reuse them.
  let centreX = R.x + 0.5 * R.w; //g.getWidth();
  let centreY = R.y + 0.5 * R.h; //g.getWidth();
  let minRadius = 0.38 * R.h; //g.getWidth();
  let maxRadius = 0.50 * R.h; //g.getWidth();
  
  //####### A function to simplify a bit the code ######
  function simplify (sA, eA, Z) {
  const zone= require("graphics_utils");
  let startAngle = zone.degreesToRadians(sA);
  let endAngle = zone.degreesToRadians(eA);
  zone.fillArc(g, centreX, centreY, minRadius, maxRadius, startAngle, endAngle);
  g.drawString(Z, 29,80);}
  
  //####### A function to simplify next&previous zones ######
  function zoning (max, min) {
  g.drawString(max, 56,28);g.drawString(min, 60,128);}
  
  //draw background image (dithered green zones)(I should draw different zones in different dithered colors)
   const HRzones= require("graphics_utils");
   let minRadiusz = 0.44 * g.getWidth();
   let startAngle = HRzones.degreesToRadians(-88.5);
   let endAngle = HRzones.degreesToRadians(268.5);
   g.setColor("#002200");
   HRzones.fillArc(g, centreX, centreY, minRadiusz, maxRadius, startAngle, endAngle);
   g.setFont("Vector",24);
  
  function getzone1() {g.setColor("#00ffff");{(simplify (-88.5, -20, "Z1"));}zoning(minzone2, minhr);}
  function getzone2a() {g.setColor("#00ff00");{(simplify (-43.5, -21.5, "Z2"));}zoning(maxzone2, minzone2);}
  function getzone2b() {g.setColor("#00ff00");{(simplify (-20, 1.5, "Z2"));}zoning(maxzone2, minzone2);}
  function getzone2c() {g.setColor("#00ff00");{(simplify (3, 24, "Z2"));}zoning(maxzone2, minzone2);}
  function getzone3a() {g.setColor("#ffff00");{(simplify (25.5, 46.5, "Z3"));}zoning(maxzone3, maxzone2);}
  function getzone3b() {g.setColor("#ffff00");{(simplify (48, 69, "Z3"));}zoning(maxzone3, maxzone2);}
  function getzone3c() {g.setColor("#ffff00");{(simplify (70.5, 91.5, "Z3"));}zoning(maxzone3, maxzone2);}
  function getzone4a() {g.setColor("#ff8000");{(simplify (91, 114.5, "Z4"));}zoning(maxzone4, maxzone3);}
  function getzone4b() {g.setColor("#ff8000");{(simplify (116, 137.5, "Z4"));}zoning(maxzone4, maxzone3);}
  function getzone4c() {g.setColor("#ff8000");{(simplify (139, 160, "Z4"));}zoning(maxzone4, maxzone3);}
  function getzone5a() {g.setColor("#ff0000");{(simplify (161.5, 182.5, "Z5"));}zoning(maxzone5, maxzone4);}
  function getzone5b() {g.setColor("#ff0000");{(simplify (184, 205, "Z5"));}zoning(maxzone5, maxzone4);}
  function getzone5c() {g.setColor("#ff0000");{(simplify (206.5, 227.5, "Z5"));}zoning(maxzone5, maxzone4);}
  
  function getzonealert() {
   const HRzonemax = require("graphics_utils");
   let centreX1,centreY1,maxRadius1 = 1;
   let minRadius = 0.40 * g.getWidth();
   let startAngle1 = HRzonemax.degreesToRadians(-90);
   let endAngle1 = HRzonemax.degreesToRadians(270);
   g.setFont("Vector",38);g.setColor("#ff0000");
   HRzonemax.fillArc(g, centreX, centreY, minRadius, maxRadius, startAngle1, endAngle1);
   g.drawString("ALERT", 26,66);
  }
  //Subdivided zones for better readability of zones when calling the images. //Changing HR zones will trigger the function with the image and previous&next HR zones.
  
    if (hr <= hrr*0.6 + minhr) {(getzone1());
  } else if (hr <= hrr*0.64 + minhr) {(getzone2a());
  } else if (hr <= hrr*0.67+minhr) {(getzone2b());
  } else if (hr <= hrr * 0.7 + minhr) {(getzone2c());
  } else if (hr <= hrr * 0.74 + minhr) {(getzone3a());
  } else if (hr <= hrr * 0.77 + minhr) {(getzone3b());
  } else if (hr <= hrr * 0.8 + minhr) {(getzone3c());
  } else if (hr <= hrr * 0.84 + minhr) {(getzone4a());
  } else if (hr <= hrr * 0.87 + minhr) {(getzone4b());
  } else if (hr <= hrr * 0.9 + minhr) {(getzone4c());
  } else if (hr <= hrr * 0.94 + minhr) {(getzone5a());
  } else if (hr <= hrr * 0.96 + minhr) {(getzone5b());
  } else if (hr <= hrr * 0.98 + minhr) {(getzone5c());
  } else if (hr >= maxhr - 2) {g.clear();(getzonealert());}
}