Change the timer data structure to fix network bugs and refactored shared timer functions

src/components/party/Party.js

@@ -58,7 +58,15 @@ function Party({
             stream={partyStreams[id]}
           />
         ))}
-        <Timer timer={timer} />
+        {timer && <Timer timer={timer} index={0} />}
+        {Object.entries(partyTimers).map(([id, partyTimer], index) => (
+          <Timer
+            timer={partyTimer}
+            key={id}
+            // Put party timers above your timer if there is one
+            index={timer ? index + 1 : index}
+          />
+        ))}
       </Box>
       <Flex sx={{ flexDirection: "column" }}>
         <ChangeNicknameButton nickname={nickname} onChange={onNicknameChange} />

src/components/party/Timer.js

@@ -1,33 +1,18 @@
-import React, { useEffect, useState, useRef } from "react";
+import React, { useEffect, useRef } from "react";
 import ReactDOM from "react-dom";
 import { Box, Progress } from "theme-ui";
 
 import usePortal from "../../helpers/usePortal";
 
-function getTimerDuration(t) {
+function Timer({ timer, index }) {
-  if (!t) {
-    return 0;
-  }
-  return t.hour * 3600000 + t.minute * 60000 + t.second * 1000;
-}
-
-function Timer({ timer }) {
-  const [maxDuration, setMaxDuration] = useState(0);
-
-  const previousTimerRef = useRef(timer);
-  useEffect(() => {
-    if (!previousTimerRef.current && timer) {
-      setMaxDuration(getTimerDuration(timer));
-    }
-    previousTimerRef.current = timer;
-  });
-
-  useEffect(() => {
-    progressBarRef.current.value = getTimerDuration(timer);
-  }, [timer]);
-
   const progressBarRef = useRef();
 
+  useEffect(() => {
+    if (progressBarRef.current && timer) {
+      progressBarRef.current.value = timer.current;
+    }
+  }, [timer]);
+
   useEffect(() => {
     let request = requestAnimationFrame(animate);
     let previousTime = performance.now();
@@ -36,13 +21,15 @@ function Timer({ timer }) {
       const deltaTime = time - previousTime;
       previousTime = time;
 
-      progressBarRef.current.value -= deltaTime;
+      if (progressBarRef.current && progressBarRef.current.value > 0) {
+        progressBarRef.current.value -= deltaTime;
+      }
     }
 
     return () => {
       cancelAnimationFrame(request);
     };
-  }, [maxDuration]);
+  }, []);
 
   const timerContainer = usePortal("root");
 
@@ -59,15 +46,15 @@ function Timer({ timer }) {
         borderRadius: "28px",
         left: "50%",
         maxWidth: "500px",
-        width: "60%",
+        width: "40%",
-        transform: "translateX(-50%)",
+        transform: `translate(-50%, -${index * 36}px)`,
         padding: "0 8px",
         margin: "8px",
       }}
       bg="overlay"
     >
       <Progress
-        max={maxDuration}
+        max={timer && timer.max}
         m={2}
         sx={{ width: "100%" }}
         ref={progressBarRef}

src/helpers/timer.js

@@ -0,0 +1,33 @@
+const MILLISECONDS_IN_HOUR = 3600000;
+const MILLISECONDS_IN_MINUTE = 60000;
+const MILLISECONDS_IN_SECOND = 1000;
+
+/**
+ * Returns a timers duration in milliseconds
+ * @param {Object} t The object with an hour, minute and second property
+ */
+export function getHMSDuration(t) {
+  if (!t) {
+    return 0;
+  }
+  return (
+    t.hour * MILLISECONDS_IN_HOUR +
+    t.minute * MILLISECONDS_IN_MINUTE +
+    t.second * MILLISECONDS_IN_SECOND
+  );
+}
+
+/**
+ * Returns an object with an hour, minute and second property
+ * @param {number} duration The duration in milliseconds
+ */
+export function getDurationHMS(duration) {
+  let workingDuration = duration;
+  const hour = Math.floor(workingDuration / MILLISECONDS_IN_HOUR);
+  workingDuration -= hour * MILLISECONDS_IN_HOUR;
+  const minute = Math.floor(workingDuration / MILLISECONDS_IN_MINUTE);
+  workingDuration -= minute * MILLISECONDS_IN_MINUTE;
+  const second = Math.floor(workingDuration / MILLISECONDS_IN_SECOND);
+
+  return { hour, minute, second };
+}

src/modals/StartTimerModal.js

@@ -3,6 +3,8 @@ import { Box, Label, Input, Button, Flex, Text } from "theme-ui";
 
 import Modal from "../components/Modal";
 
+import { getHMSDuration, getDurationHMS } from "../helpers/timer";
+
 function StartTimerModal({
   isOpen,
   onRequestClose,
@@ -24,7 +26,8 @@ function StartTimerModal({
     if (timer) {
       onTimerStop();
     } else {
-      onTimerStart({ hour, minute, second });
+      const duration = getHMSDuration({ hour, minute, second });
+      onTimerStart({ current: duration, max: duration });
     }
   }
 
@@ -47,6 +50,8 @@ function StartTimerModal({
     return Math.min(num, max);
   }
 
+  const timerHMS = timer && getDurationHMS(timer.current);
+
   return (
     <Modal
       isOpen={isOpen}
@@ -70,7 +75,7 @@ function StartTimerModal({
             </Text>
             <Input
               sx={inputStyle}
-              value={`${timer ? timer.hour : hour}`}
+              value={`${timer ? timerHMS.hour : hour}`}
               onChange={(e) => setHour(parseValue(e.target.value, 24))}
               type="number"
               disabled={timer}
@@ -82,7 +87,7 @@ function StartTimerModal({
             </Text>
             <Input
               sx={inputStyle}
-              value={`${timer ? timer.minute : minute}`}
+              value={`${timer ? timerHMS.minute : minute}`}
               onChange={(e) => setMinute(parseValue(e.target.value, 59))}
               type="number"
               ref={inputRef}
@@ -95,7 +100,7 @@ function StartTimerModal({
             </Text>
             <Input
               sx={inputStyle}
-              value={`${timer ? timer.second : second}`}
+              value={`${timer ? timerHMS.second : second}`}
               onChange={(e) => setSecond(parseValue(e.target.value, 59))}
               type="number"
               disabled={timer}

src/network/NetworkedParty.js

@@ -3,7 +3,7 @@ import React, { useContext, useState, useEffect, useCallback } from "react";
 // Load session for auto complete
 // eslint-disable-next-line no-unused-vars
 import Session from "../helpers/Session";
-import { isStreamStopped, omit } from "../helpers/shared";
+import { isStreamStopped, omit, fromEntries } from "../helpers/shared";
 
 import AuthContext from "../contexts/AuthContext";
 
@@ -73,23 +73,18 @@ function NetworkedParty({ gameId, session }) {
 
   useEffect(() => {
     function decreaseTimer(previousTimer) {
-      if (previousTimer.second > 0) {
+      return { ...previousTimer, current: previousTimer.current - 1000 };
-        return { ...previousTimer, second: previousTimer.second - 1 };
-      } else if (previousTimer.minute > 0) {
-        return {
-          ...previousTimer,
-          minute: previousTimer.minute - 1,
-          second: 59,
-        };
-      } else if (previousTimer.hour > 0) {
-        return { hour: previousTimer.hour - 1, minute: 59, second: 59 };
-      } else return { hour: 0, minute: 0, second: 0 };
     }
     function updateTimers() {
       if (timer) {
         const newTimer = decreaseTimer(timer);
-        setTimer(newTimer);
+        if (newTimer.current < 0) {
-        session.send("timer", { [session.id]: newTimer });
+          setTimer(null);
+          session.send("timer", { [session.id]: null });
+        } else {
+          setTimer(newTimer);
+          session.send("timer", { [session.id]: newTimer });
+        }
       }
     }
     const interval = setInterval(updateTimers, 1000);
@@ -122,10 +117,14 @@ function NetworkedParty({ gameId, session }) {
         }));
       }
       if (id === "timer") {
-        setPartyTimers((prevTimers) => ({
+        setPartyTimers((prevTimers) => {
-          ...prevTimers,
+          const newTimers = { ...prevTimers, ...data };
-          ...data,
+          // filter out timers that are null
-        }));
+          const filtered = Object.entries(newTimers).filter(
+            ([, value]) => value !== null
+          );
+          return fromEntries(filtered);
+        });
       }
     }