Label underground bracket in the FactCard

app/features/tournament/tournament-utils.test.ts

@@ -797,17 +797,26 @@ describe("tournamentNameParts", () => {
 });
 
 describe("bracketProgressionLabel", () => {
+	const bracket = (
+		bracket: Partial<ParsedBracket> & Pick<ParsedBracket, "type">,
+	): ParsedBracket => ({
+		name: bracket.type,
+		requiresCheckIn: false,
+		settings: {},
+		...bracket,
+	});
+
 	it("returns the short code for a single stage", () => {
-		expect(bracketProgressionLabel([{ type: "single_elimination" }])).toBe(
-			"SE",
-		);
+		expect(
+			bracketProgressionLabel([bracket({ type: "single_elimination" })]),
+		).toBe("SE");
 	});
 
 	it("joins stages with an arrow", () => {
 		expect(
 			bracketProgressionLabel([
-				{ type: "round_robin" },
-				{ type: "single_elimination" },
+				bracket({ type: "round_robin" }),
+				bracket({ type: "single_elimination" }),
 			]),
 		).toBe("RR → SE");
 	});
@@ -815,13 +824,45 @@ describe("bracketProgressionLabel", () => {
 	it("collapses consecutive duplicate stages", () => {
 		expect(
 			bracketProgressionLabel([
-				{ type: "single_elimination" },
-				{ type: "single_elimination" },
-				{ type: "double_elimination" },
+				bracket({ type: "single_elimination" }),
+				bracket({ type: "single_elimination" }),
+				bracket({ type: "double_elimination" }),
 			]),
 		).toBe("SE → DE");
 	});
 
+	it("appends an underground bracket of a new type with a plus and (UG) tag", () => {
+		expect(
+			bracketProgressionLabel([
+				bracket({ type: "double_elimination" }),
+				bracket({
+					type: "single_elimination",
+					sources: [{ bracketIdx: 0, placements: [-1] }],
+				}),
+			]),
+		).toBe("DE + SE (UG)");
+	});
+
+	it("collapses repeated underground brackets of an already-shown type", () => {
+		expect(
+			bracketProgressionLabel([
+				bracket({ type: "round_robin" }),
+				bracket({
+					type: "single_elimination",
+					sources: [{ bracketIdx: 0, placements: [1] }],
+				}),
+				bracket({
+					type: "single_elimination",
+					sources: [{ bracketIdx: 0, placements: [2] }],
+				}),
+				bracket({
+					type: "single_elimination",
+					sources: [{ bracketIdx: 0, placements: [3] }],
+				}),
+			]),
+		).toBe("RR → SE (UG)");
+	});
+
 	it("returns empty string for empty progression", () => {
 		expect(bracketProgressionLabel([])).toBe("");
 	});

app/features/tournament/tournament-utils.ts

@@ -500,30 +500,51 @@ const STAGE_TYPE_TO_SHORT_CODE: Record<
 };
 
 /**
- * Builds a compact arrow-separated label describing the bracket progression of a tournament,
+ * Builds a compact label describing the bracket progression of a tournament,
  * derived from `settings.bracketProgression`.
  *
- * Each stage type is rendered as a short code (`RR`, `SE`, `DE`, `SW`) and consecutive duplicates
- * are collapsed so e.g. two single-elimination stages still render as a single `SE`.
+ * Each stage type is rendered as a short code (`RR`, `SE`, `DE`, `SW`). Main progression stages are
+ * arrow-separated with consecutive duplicates collapsed (e.g. two single-elimination stages still
+ * render as a single `SE`).
+ *
+ * Underground brackets are not part of the main progression — they give early losers another chance
+ * to play. When present the whole label is tagged `(UG)` once. An underground bracket type that does
+ * not already appear in the main progression is also surfaced with `+ {code}`, while repeated
+ * underground brackets of an already-shown type are collapsed away to keep the label compact.
  *
  * @example
- * // [{type: "round_robin"}, {type: "single_elimination"}]
- * bracketProgressionLabel(progression) // "RR → SE"
+ * // [{type: "round_robin"}, {type: "single_elimination"}, ...underground SE brackets]
+ * bracketProgressionLabel(progression) // "RR → SE (UG)"
+ * // [{type: "double_elimination"}, {type: "single_elimination", sources: [...]}]
+ * bracketProgressionLabel(progression) // "DE + SE (UG)"
  */
-export function bracketProgressionLabel(
-	progression: Pick<ParsedBracket, "type">[],
-): string {
+export function bracketProgressionLabel(progression: ParsedBracket[]): string {
 	if (progression.length === 0) return "";
 
-	const codes: string[] = [];
-	for (const bracket of progression) {
-		const code = STAGE_TYPE_TO_SHORT_CODE[bracket.type];
+	const mainCodes: string[] = [];
+	const undergroundCodes: string[] = [];
+	for (let i = 0; i < progression.length; i++) {
+		const code = STAGE_TYPE_TO_SHORT_CODE[progression[i].type];
+		const codes = Progression.isUnderground(i, progression)
+			? undergroundCodes
+			: mainCodes;
 		if (codes.at(-1) !== code) {
 			codes.push(code);
 		}
 	}
 
-	return codes.join(" → ");
+	const mainLabel = mainCodes.join(" → ");
+
+	if (undergroundCodes.length === 0) return mainLabel;
+
+	const extraCodes = undergroundCodes.filter(
+		(code) => !mainCodes.includes(code),
+	);
+
+	const label =
+		extraCodes.length > 0 ? [mainLabel, ...extraCodes].join(" + ") : mainLabel;
+
+	return `${label} (UG)`;
 }
 
 /**