From f9f5afaec9e830e68809521eed3dd5b56424549c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Felix=20F=C3=B6rtsch?= <mail@felixfoertsch.de>
Date: Thu, 12 Mar 2026 11:13:07 +0100
Subject: [PATCH] add game manager for predictions, dishes in-memory state

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 packages/server/src/games/game-manager.ts | 189 ++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 packages/server/src/games/game-manager.ts

diff --git a/packages/server/src/games/game-manager.ts b/packages/server/src/games/game-manager.ts
new file mode 100644
index 0000000..1613ec9
--- /dev/null
+++ b/packages/server/src/games/game-manager.ts
@@ -0,0 +1,189 @@
+import { randomUUID } from "node:crypto"
+import type { Prediction, Dish, DishGuess, GameState, Lineup } from "@celebrate-esc/shared"
+import lineupData from "../../data/esc-2026.json"
+
+const lineup: Lineup = lineupData as Lineup
+const countryCodes = new Set(lineup.countries.map((c) => c.code))
+
+interface InternalDish {
+	id: string
+	name: string
+	correctCountry: string
+	revealed: boolean
+}
+
+interface InternalDishGuess {
+	dishId: string
+	playerId: string
+	guessedCountry: string
+}
+
+export class GameManager {
+	private predictions = new Map<string, Prediction>() // playerId → prediction
+	private dishes: InternalDish[] = []
+	private dishGuesses: InternalDishGuess[] = []
+	private locked = false
+
+	getLineup(): Lineup {
+		return lineup
+	}
+
+	isValidCountry(code: string): boolean {
+		return countryCodes.has(code)
+	}
+
+	// ─── Predictions ────────────────────────────────────────────────
+
+	arePredictionsLocked(): boolean {
+		return this.locked
+	}
+
+	lockPredictions(): void {
+		this.locked = true
+	}
+
+	submitPrediction(
+		playerId: string,
+		predictedWinner: string,
+		top3: string[],
+		nulPointsPick: string,
+	): { success: true } | { error: string } {
+		if (this.locked) return { error: "Predictions are locked" }
+
+		// Validate all countries exist
+		const allPicks = [predictedWinner, ...top3, nulPointsPick]
+		for (const code of allPicks) {
+			if (!this.isValidCountry(code)) return { error: `Invalid country: ${code}` }
+		}
+
+		// Winner must not be in top3
+		if (top3.includes(predictedWinner)) {
+			return { error: "Winner cannot also be in top 3" }
+		}
+
+		// No duplicates in top3
+		if (new Set(top3).size !== 3) {
+			return { error: "Top 3 must be unique countries" }
+		}
+
+		this.predictions.set(playerId, { playerId, predictedWinner, top3, nulPointsPick })
+		return { success: true }
+	}
+
+	getPrediction(playerId: string): Prediction | null {
+		return this.predictions.get(playerId) ?? null
+	}
+
+	getAllPredictions(): Map<string, Prediction> {
+		return this.predictions
+	}
+
+	// ─── Dishes ─────────────────────────────────────────────────────
+
+	addDish(name: string, correctCountry: string): { dish: InternalDish } | { error: string } {
+		if (!this.isValidCountry(correctCountry)) {
+			return { error: `Invalid country: ${correctCountry}` }
+		}
+
+		const dish: InternalDish = {
+			id: randomUUID(),
+			name,
+			correctCountry,
+			revealed: false,
+		}
+		this.dishes.push(dish)
+		return { dish }
+	}
+
+	getDishes(): InternalDish[] {
+		return this.dishes
+	}
+
+	submitDishGuess(
+		playerId: string,
+		dishId: string,
+		guessedCountry: string,
+	): { success: true } | { error: string } {
+		if (!this.isValidCountry(guessedCountry)) {
+			return { error: `Invalid country: ${guessedCountry}` }
+		}
+
+		const dish = this.dishes.find((d) => d.id === dishId)
+		if (!dish) return { error: "Dish not found" }
+		if (dish.revealed) return { error: "Dish already revealed" }
+
+		// Replace existing guess for same player+dish
+		this.dishGuesses = this.dishGuesses.filter(
+			(g) => !(g.playerId === playerId && g.dishId === dishId),
+		)
+		this.dishGuesses.push({ dishId, playerId, guessedCountry })
+		return { success: true }
+	}
+
+	getDishGuesses(playerId: string): DishGuess[] {
+		return this.dishGuesses
+			.filter((g) => g.playerId === playerId)
+			.map((g) => ({ dishId: g.dishId, playerId: g.playerId, guessedCountry: g.guessedCountry }))
+	}
+
+	revealDishes(): InternalDish[] {
+		for (const dish of this.dishes) {
+			dish.revealed = true
+		}
+		return this.dishes
+	}
+
+	getDishResults(
+		playerLookup: Map<string, string>,
+	): { dish: Dish; guesses: { playerId: string; displayName: string; guessedCountry: string; correct: boolean }[] }[] {
+		return this.dishes.map((dish) => ({
+			dish: { id: dish.id, name: dish.name, correctCountry: dish.correctCountry, revealed: dish.revealed },
+			guesses: this.dishGuesses
+				.filter((g) => g.dishId === dish.id)
+				.map((g) => ({
+					playerId: g.playerId,
+					displayName: playerLookup.get(g.playerId) ?? "Unknown",
+					guessedCountry: g.guessedCountry,
+					correct: g.guessedCountry === dish.correctCountry,
+				})),
+		}))
+	}
+
+	areAllDishesRevealed(): boolean {
+		return this.dishes.length > 0 && this.dishes.every((d) => d.revealed)
+	}
+
+	// ─── State for client ───────────────────────────────────────────
+
+	getGameStateForPlayer(playerId: string, playerLookup: Map<string, string>): GameState {
+		return {
+			lineup,
+			myPrediction: this.getPrediction(playerId),
+			predictionsLocked: this.locked,
+			dishes: this.dishes.map((d) => ({
+				id: d.id,
+				name: d.name,
+				correctCountry: d.revealed ? d.correctCountry : "",
+				revealed: d.revealed,
+			})),
+			myDishGuesses: this.getDishGuesses(playerId),
+			dishResults: this.areAllDishesRevealed() ? this.getDishResults(playerLookup) : null,
+		}
+	}
+
+	getGameStateForDisplay(playerLookup: Map<string, string>): GameState {
+		return {
+			lineup,
+			myPrediction: null,
+			predictionsLocked: this.locked,
+			dishes: this.dishes.map((d) => ({
+				id: d.id,
+				name: d.name,
+				correctCountry: d.revealed ? d.correctCountry : "",
+				revealed: d.revealed,
+			})),
+			myDishGuesses: [],
+			dishResults: this.areAllDishesRevealed() ? this.getDishResults(playerLookup) : null,
+		}
+	}
+}