// engine.js

let socket = new WebSocket("wss://trackme.ovh/ws");
const arrows = ["↑", "↗", "→", "↘", "↓", "↙", "←", "↖"];
let togglefollowbtn;

class Position {
  constructor(type, iconUrl, iconRetinaUrl) {
    this.type = type;
    this.iconUrl = iconUrl;
    this.iconRetinaUrl = iconRetinaUrl;
    this.text = "";
  }

  setData(obj) {
    this.data = obj;
  }

  setDefaultData() {
    this.data = {latitude:49, longitude:0};
  }

  static getMiddle(t, u) {
    const mid = {coords: [49, 0]};
    if (t.coords && u.coords) {
      for (const i in mid.coords) {
        mid.coords[i] = Math.min(t.coords[i], u.coords[i]) + (Math.abs(t.coords[i] - u.coords[i])/2);
      }
    } else mid.coords = t.coords;
    return mid.coords;
  }

  createLocation() {
    const icon = new L.Icon.Default;
    icon.options.iconUrl = this.iconUrl;
    icon.options.iconRetinaUrl = this.iconRetinaUrl;

    try {
      this.point = L.marker(this.coords, {
        color: "red",
        fillColor: "#f03",
        fillOpacity: 0.5,
        radius: 50,
        icon: icon
      }).addTo(map).bindPopup(this.text);

      this.point.getPopup().autoPan = false;
      //this.point.openPopup();
    } catch (err) {
      console.log(`unable to create point (${err})`);
    }
  }
}

let map;
let follow = true;
const tracker = new Position("tracker", "marker-icon.png", "marker-icon-2x.png");
const user = new Position("user", "marker-icon-alt.png", "marker-icon-2x-alt.png");


function userGPSsuccess(pos) {
  user.data = {
    latitude: pos.coords.latitude,
    longitude: pos.coords.longitude,
    height: pos.coords.altitude,
    speed: pos.coords.speed,
    direction: pos.coords.heading,
  };
  user.coords = [pos.coords.latitude, pos.coords.longitude];
}

function userGPSerror(err) {
  console.log(err);
  user.setDefaultData();
}

function getPosition() {
  if (navigator.geolocation) {
    return new Promise((resolve, _reject) => {
      navigator.geolocation.getCurrentPosition(userGPSsuccess, userGPSerror);
      resolve("Position fetched");
    });
  }
}

function createMap(coords) {
  map = L.map("map", {
    center: coords,
    zoom: 10
  });
  L.tileLayer(`https://tile.openstreetmap.org/{z}/{x}/{y}.png`, {
    maxZoom: 19,
    attribution: `&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> / <a href="https://www.paulbsd.com">PaulBSD</a>`
  }).addTo(map);
  map.zoomControl.setPosition('bottomright');
  map.addEventListener("zoomlevelschange", (_event) => {
    update();
  });
}

function update() {
  if (tracker.data) {
    tracker.coords = [tracker.data.latitude, tracker.data.longitude];
    tracker.data.speed = tracker.data.speed/10;
    tracker.section = parseInt(tracker.data.direction/45 + 0.5) % 8;
    tracker.text = `<b>Tracker</b><br/>time: ${tracker.data.time}<br/>latitude: ${tracker.data.latitude}<br/>longitude: ${tracker.data.longitude}<br/>height: ${tracker.data.height}<br/>speed: ${tracker.data.speed}<br/>direction: ${arrows[tracker.section]} ${tracker.data.direction}°<br/>serial: ${tracker.data.serial}`;
  }

  //user.text = `<b>You</b><br/>latitude: ${user.data.latitude}<br/>longitude: ${user.data.longitude}<br/>height: ${user.data.height}<br/>speed: ${user.data.speed}<br/>direction: ${arrows[user.section]} ${user.data.direction}°`;
  if (user.data) {
    user.text = `<b>You</b><br/>latitude: ${user.data.latitude}<br/>longitude: ${user.data.longitude}`;
  }

  if (tracker.data) {
    const center = [tracker.data.latitude, tracker.data.longitude];
    if (!map) {
      createMap(center);
    }
  }

  if (map && follow) {
    const coords = Position.getMiddle(tracker, user);
    try {
      map.setView(coords);
      map.flyTo(coords);
      map.fitBounds([tracker.coords, user.coords]);
    } catch (e) {
      console.log(e, coords);
    }
  }

  if (!tracker.point && tracker.data) {
    tracker.createLocation();
  } else {
    if (tracker.coords) {
      tracker.point.setLatLng(tracker.coords);
      tracker.point.setPopupContent(tracker.text);
    }
  }

  if (!user.point && user.data) {
    user.createLocation();
  } else {
    if (user.coords) {
      user.point.setLatLng(user.coords);
      user.point.setPopupContent(user.text);
    }
  }
}

function ping() {
  try {
    if (socket.readyState > 1) {
      throw "closed socket";
    }
    socket.send("ping")
  } catch (err) {
    console.log(err);
    socket = new WebSocket("wss://trackme.ovh/ws");
  }
}

function followButton() {
  if (follow) togglefollowbtn.innerHTML = "Unfollow tracker";
  else togglefollowbtn.innerHTML = "Follow tracker";
}

function main() {
  togglefollowbtn = document.querySelector("#togglefollowbtn");
  follow = JSON.parse(localStorage.getItem("follow"));
  followButton();

  togglefollowbtn.addEventListener("click", function() {
    follow = !follow;
    localStorage.setItem("follow", follow);
    followButton();
  });

  socket.addEventListener("message", (event) => {
    tracker.data = JSON.parse(event.data);
    update();
  });

  socket.addEventListener("open", (_event) => {
    ping();
  });

  setInterval(getPosition, 1000);
  setInterval(ping, 1000);
  setInterval(update, 1000);
}

main();