Adds the ability to join or leave a gamenight.

frontend/src/components/Gamenight.jsx

@@ -1,4 +1,4 @@
-import React, { useState } from 'react';
+import React, { useState, useEffect } from 'react';
 import List from '@mui/material/List';
 import ListItem from '@mui/material/ListItem';
 import ListItemText from '@mui/material/ListItemText';
@@ -6,15 +6,26 @@ import ListSubheader from '@mui/material/ListSubheader';
 import ArrowBackIcon from '@mui/icons-material/ArrowBack';
 import IconButton from '@mui/material/IconButton';
 import Typography from '@mui/material/Typography';
+import Button from '@mui/material/Button';
 
 import moment from 'moment';
-
+import {unpack_api_result, get_gamenight, patch_gamenight} from '../api/Api';
 
 function Gamenight(props) {
 
   const [dense, setDense] = useState(true);
+  const [gamenight, setGamenight] = useState(null);
 
-  let games = props.gamenight.game_list.map(g =>
+  const fetchGamenight = () => {
+    if (props.user !== null) {
+      unpack_api_result(get_gamenight(props.gamenightId, props.user.jwt), props.setFlash)
+        .then(result => setGamenight(result.gamenight));
+    }
+  }
+
+  useEffect(fetchGamenight, []);
+
+  let games = gamenight?.game_list.map(g =>
     (
       <ListItem>
         <ListItemText
@@ -24,7 +35,7 @@ function Gamenight(props) {
     )
   );
 
-  let participants = props.gamenight.participants.map(p =>
+  const participants = gamenight?.participants.map(p =>
     (
       <ListItem>
         <ListItemText
@@ -32,7 +43,46 @@ function Gamenight(props) {
         />
       </ListItem>
     )
-  )
+  );
+
+  const Join = () => {
+    const input = {
+      action: 'AddParticipant'
+    };
+    
+    unpack_api_result(patch_gamenight(gamenight.id, input, props.user.jwt), props.setFlash)
+      .then(() => fetchGamenight());
+  };
+
+  const Leave = () => {
+    const input = {
+      action: 'RemoveParticipant',
+    };
+
+    unpack_api_result(patch_gamenight(gamenight.id, input, props.user.jwt), props.setFlash)
+      .then(() => fetchGamenight());
+  };
+
+  let join_or_leave_button;
+  if(gamenight?.participants.find(p => p.id === props.user.id) === undefined) {
+    join_or_leave_button = (
+      <Button 
+        variant="outlined"
+        color="success"
+        onClick={Join}>
+        Join
+      </Button>
+    )
+  } else {
+    join_or_leave_button = (
+      <Button 
+        variant="outlined"
+        color="error"
+        onClick={Leave}>
+        Leave
+      </Button>
+    )
+  }
 
   return (
     <div>
@@ -43,10 +93,10 @@ function Gamenight(props) {
       </IconButton>
 
       <Typography type="h3">
-        {props.gamenight.name}
+        {gamenight?.name}
       </Typography>
       <Typography type="body1">
-        When: {moment(props.gamenight.datetime).format('LL HH:mm')}
+        When: {moment(gamenight?.datetime).format('LL HH:mm')}
       </Typography>
 
       <List 
@@ -69,6 +119,7 @@ function Gamenight(props) {
         }>
         {participants}
       </List>
+      {join_or_leave_button}
     </div>
   )
 }