supporter carousel weighted chance

dash-frontend/src/tab/home.rs

@@ -39,7 +39,13 @@ fn get_supporter_anim(
 	prev_supporter_name: String,
 ) -> Animation {
 	let username = loop {
-		let random_supporter = &supporters.supporters[rand::random_range(0..supporters.supporters.len() - 1)];
+		let total_tickets: u32 = supporters.supporters.iter().map(|s| s.tickets()).sum();
+		let jackpot = rand::random_range(0..total_tickets);
+		let mut cumulative = 0u32;
+		let random_supporter = supporters.supporters.iter().find(|s| {
+			cumulative += s.tickets();
+			cumulative >= jackpot
+		}).unwrap();
 		let username = random_supporter.username.clone();
 		if username != prev_supporter_name {
 			break username;

dash-frontend/src/util/cached_fetcher.rs

@@ -24,7 +24,7 @@ impl SupporterTier {
 		format!("{self:?} Tier")
 	}
 	
-	pub fn color_str(self) -> &'static str {
+	pub const fn color_str(self) -> &'static str {
 		match self {
 			Self::Platinum => "#aaffff",
 			Self::Gold => "#ffffaa",
@@ -32,6 +32,15 @@ impl SupporterTier {
 			Self::Bronze => "#ffaa66",
 		}
 	}
+
+	pub const fn tickets(self) -> u32 {
+		match self {
+			Self::Platinum => 20,
+			Self::Gold => 10,
+			Self::Silver => 5,
+			Self::Bronze => 1,
+		}
+	}
 }
 
 #[derive(Serialize, Deserialize)]
@@ -42,6 +51,12 @@ pub struct Supporter {
 	pub contribution_count: u32,
 }
 
+impl Supporter {
+	pub const fn tickets(&self) -> u32 {
+		self.tier.tickets()
+	}
+}
+
 #[derive(Serialize, Deserialize)]
 pub struct Supporters {
 	pub time_window_days: u32,