feat(#23): triggering fireworks when everyone's on board 🎆

src/components/FireworkShow.svelte

@@ -0,0 +1,102 @@
+<script lang="ts">
+  import { onMount, onDestroy } from 'svelte';
+  import { writable } from 'svelte/store';
+  type Rocket = {
+    id: number;
+    x: string;
+    y: string;
+    colour: string;
+  }
+  const rockets = writable<Rocket[]>([]);
+  let rocketIntervalId;
+  let rocketCount: number = 0;
+
+  function randomLocation(): { x: string; y: string;} {
+    return {
+      x: `${Math.random() * window.innerWidth - window.innerWidth / 2}px`,
+      y: `${Math.random() * window.innerHeight - window.innerHeight / 2}px`,
+    };
+  }
+
+  function randomColour(): string {
+    return `hsl(${Math.floor(Math.random() * 361)}, 100%, 50%)`;
+  }
+
+  function randomTimer(): number {
+    return Math.floor(Math.random() * (150 - 30 + 1)) + 30;
+  }
+
+  function setupRocket(): Rocket {
+    const colour = randomColour();
+    const { x, y } = randomLocation();
+    const newRocket: Rocket = { id: rocketCount++, x, y, colour };
+    return newRocket;
+  }
+
+  function launchRockets() {
+    const newRocket = setupRocket();
+    rockets.update((currentRockets) => {
+      if (currentRockets.length > 25) {
+        // only keep 100 rockets
+        currentRockets.shift();
+      }
+      return [...currentRockets, newRocket]
+    });
+  }
+
+  onMount(() => {
+    rocketIntervalId = setInterval(launchRockets, randomTimer());
+    setTimeout(()=>{ clearInterval(rocketIntervalId) }, 13000)
+	});
+
+  onDestroy(() => {
+    clearInterval(rocketIntervalId);
+  });
+</script>
+
+<style>
+
+  .rocket {
+    --x: 0;
+    --y: 0;
+    background-color: rebeccapurple;
+    border-radius: 50%;
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    height: 5px;
+    width: 5px;
+    z-index: -1;
+  }
+
+  .rocket.move {
+    animation: move 1000ms linear forwards;
+  }
+
+  @keyframes move {
+    to {
+      transform: translate(var(--x), var(--y));
+    }
+
+    95% {
+      opacity: 1;
+    }
+
+    100% {
+      opacity: 0;
+    }
+  }
+</style>
+
+<div class="launch-pad">
+  {#each $rockets as rocket (rocket.id)}
+    <span
+      class="rocket move"
+      style="
+        --x: {rocket.x};
+        --y: {rocket.y};
+        background: {rocket.colour};
+      "
+    ></span>
+  {/each}
+</div>

src/routes/estimation/[roomId]/+page.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 	const changesLog = [
 		{ timestamp: '2024-01-05T00:00:00', message: 'Added the ability to kick a user' },
-		{ timestamp: '2024-01-05T00:00:00', message: 'Added update notes' },
+		{ timestamp: '2024-01-05T00:00:00', message: 'Added update notes' }
 	];
 
 	let newChanges = [];
@@ -36,6 +36,7 @@
 	import EstimateGroupsList from '../../../components/EstimateGroupsList.svelte';
 	import Modal from '../../../components/Modal.svelte';
 	import Estimates from '../../../components/Estimates.svelte';
+	import FireworkShow from '../../../components/FireworkShow.svelte';
 
 	import { connectToWebSocket, sendMessage, generateId } from '../estimation.js';
 
@@ -89,7 +90,9 @@
 	let showEstimates = false;
 	let disableEstimates: boolean = false;
 	let audioElement;
+	let fireworks;
 	let selectedCardSet;
+	let showFireworks = false;
 
 	function closeModal() {
 		showModal = false;
@@ -142,6 +145,16 @@
 		sendMessage(socket, { roomId: data.roomId, type: 'restart-estimation' });
 	}
 
+	function areEstimatesSame(estimateGroups: { [key: number | string]: string[] }): boolean {
+		const estimates = Object.keys(estimateGroups);
+		const users = Object.values(estimateGroups);
+		const allUsers = users.flat();
+
+		if (allUsers.length > 2 && estimates.length === 1) {
+			return true;
+		}
+	}
+
 	function onMessageReceived(message) {
 		if (message.type === 'user-joined') {
 			sendMessage(socket, { type: 'get-user-estimates' });
@@ -166,10 +179,17 @@
 			users = users.filter((user) => user.userId !== message.userId);
 		} else if (message.type === 'estimation-closed') {
 			estimateGroups = message.groupedEstimates;
+			showFireworks = areEstimatesSame(estimateGroups);
+			if (showFireworks) {
+				fireworks.play();
+			}
 			showRestartButton = true;
 			showEstimates = true;
 			disableEstimates = true;
 		} else if (message.type === 'estimation-restarted') {
+			showFireworks = false;
+			fireworks.pause();
+			fireworks.currentTime = 0;
 			estimateGroups = {};
 			showRestartButton = false;
 			showEstimates = false;
@@ -244,7 +264,12 @@
 	<EstimateGroupsList {estimateGroups} />
 {/if}
 
+{#if showFireworks}
+	<FireworkShow />
+{/if}
+
 <audio src="/call-to-attention-50-percent-volume.mp3" bind:this={audioElement} />
+<audio src="/fireworks.mp3" bind:this={fireworks} />
 
 {#if showTooltip && newChanges.length > 0}
 	<div id="tooltip-container" on:click={toggleTooltip}>
@@ -254,7 +279,6 @@
 				<li>{new Date(change.timestamp).toLocaleDateString()}: {change.message}</li>
 			{/each}
 		</ul>
-		
 	</div>
 {/if}