let tableKey = {
  name: "",
  passcode: ""
}

let table = null;

let conn = null;

function showTableModal(show) {
  const modal = document.getElementById("table_modal");
  if (modal) {
    modal.style.display = show ? "block" : "none";
  }
}

function fmtLeading(n) {
  return n < 10 ? "0" + n : String(n);
}

function formatDice(r) {
  const date = new Date(r.timestamp)
  const p = document.createElement("p");
  
  const month = date.getMonth() + 1;
  const day = date.getDate();
  const hours = date.getHours();
  const minutes = date.getMinutes();
  const seconds = date.getSeconds();
  
  p.innerHTML = `${date.getFullYear()}-${fmtLeading(month)}-${fmtLeading(day)} ${fmtLeading(hours)}:${fmtLeading(minutes)}:${fmtLeading(seconds)} ${r.player} rolled ${r.roll.length}d${r.faces} ${(r.note ? "(" + r.note + ")" : "")}<br>[${r.roll}] (total ${r.roll.reduce((a,c)=>a+c,0)})`;
  
  return p;
}

function logDice(dice, many) {
  const diceLog = document.getElementById("dice_log");
  if (!many) {
    dice = [ dice ];
  } else {
    if (diceLog) {
      diceLog.innerHTML = "";
    }
  }
  if (diceLog) {
      for(const r of dice) {
        const p = formatDice(r);
        diceLog.append(p);
        p.scrollIntoView();
      }
  }
}

function setAuxMsg(msg) {
  const auxDiv = document.getElementById("aux");
  if (auxDiv) {
    auxDiv.innerText = msg;
  }
}

function makeUpToDate(table) {
  if (table) {
    if (table.diceRolls) {
      logDice(table.diceRolls, true);
    } else if (table.diceRoll) {
      logDice(table.diceRoll, false);
    }
    if (table.mapImg) {
      setMapImg(table.mapImg);
    }
    if (table.auxMsg) {
      setAuxMsg(table.auxMsg);
    }
  }
}

function setMapImg(url) {
  initializeMap(url);
}

function isTableKeyValid(name, passcode) {
  const r = /^[a-zA-Z0-9_]+$/;
  return r.test(name) && r.test(passcode);
}

function dial() {
  // get tableKey from UI
  const tblNameInput = document.getElementById("input_table_name");
  const tblPassInput = document.getElementById("input_table_pass");
  if (tblNameInput && tblPassInput && tblNameInput.value && tblPassInput.value) {
    if (isTableKeyValid(tblNameInput.value, tblPassInput.value)) {
      tableKey.name = tblNameInput.value;
      tableKey.passcode = tblPassInput.value;
      
      if (conn) {
        conn.close(1000);
      }
      conn = new WebSocket(`ws://${location.host}/subscribe`, `${tableKey.name}.${tableKey.passcode}`);
      conn.addEventListener("close", e => {
        if (e.code == 1006) {
          setErr("Table not found - check the name and passcode are correct");
        } else if (e.code > 1001) {
          // TODO: add message to let user know they are reconnecting
          setErr("Websocket error: trying to reconnect");
          setTimeout(dial, 1000)
        } else {
          tabletop = document.getElementById("tabletop");
          if (tabletop) {
            tabletop.style.display = "none";
          }
          table = null;
        }
      });
      conn.addEventListener("open", e => {
        // TODO: add message to let user know they are at the table
        tabletop = document.getElementById("tabletop");
        if (tabletop) {
          tabletop.style.display = "block";
        }
      });
      conn.addEventListener("error", e => {
        setErr(`${e.name}: ${e.message}`);
        conn.close(3000);
      })
      
      conn.addEventListener("message", e => {
        const data = JSON.parse(e.data);
        if (table == null) {
          // first fetch comes from mongo, so the rolls array in each diceRoll is a byte array and needs to be decoded
          data.diceRolls.forEach(r=>{
            r.roll = Uint8Array.from(atob(r.roll), c => c.charCodeAt(0))
          })
          table = data;
          makeUpToDate(table);
        } else {
          if (data.diceRoll) {
            data.diceRoll.roll = Uint8Array.from(atob(data.diceRoll.roll), c => c.charCodeAt(0));
          }
          makeUpToDate(data);
        }
        
        console.log(data);
      });
    } else {
      setErr("Table name and passcode can only be alphanumeric and underscores");
    }
  }else {
    setErr("Table name and passcode required");
  }
}

async function publish(msg) {
  msg.key = tableKey;
  const res = await fetch('/publish', {
    method: 'POST',
    body: JSON.stringify(msg)
  });
  if (!res.ok) {
    setErr("Failed to publish message");
  }
}