initial commit

src/renaissance.ts

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+import { Board, Card, Hand, Pile, Stack, Suit } from "./cards";
+import { clone } from "./fn";
+
+const AGG: Suit = "spades";
+const CUL: Suit = "hearts";
+const TECH: Suit = "diamonds";
+const MIL: Suit = "clubs";
+
+type GameState = {
+	mainPile: Pile;
+	discardStack: Stack;
+	deadPile: Pile;
+	players: {
+		hand: Hand;
+		board: Board;
+	}[];
+	playerTurn: number;
+	lastMove: Move;
+	prevState: GameState | null;
+};
+
+type Move =
+	| {
+			type: "draw";
+			fromPile: "main" | "discard";
+	  }
+	| { type: "play"; card: Card }
+	| { type: "remove"; card: Card }
+	| { type: "attack"; army: Card[] }
+	| { type: "pass" };
+
+type Action = Move | { type: "discard"; cards: Card[] };
+
+const techTier = (techValue: number) => Math.ceil(techValue / 14);
+const moveCost = (move: Move) => (move.type == "attack" ? move.army.length : 1);
+const movesSpent = (state: GameState): number =>
+	state.playerTurn != state.prevState?.playerTurn
+		? 0
+		: moveCost(state.lastMove) + movesSpent(state.prevState);
+
+const value = (suit: Suit) => (board: Board) =>
+	board
+		.filter((card) => card.suit === suit)
+		.reduce((v, card) => v + card.value, 0);
+
+export const getNextState = (p: {
+	state: GameState;
+	move: Move;
+}): GameState | { illegal: string } => {
+	const { state, move } = p;
+
+	const currentPlayer = state.players[state.playerTurn];
+
+	const population = currentPlayer.board.thru(value(AGG));
+	const culture = currentPlayer.board.thru(value(CUL));
+	const tech = techTier(currentPlayer.board.thru(value(TECH)));
+
+	const movesRemaining = tech - movesSpent(state);
+
+	const newState = clone(state);
+	if (move.type === "draw") {
+		const pile =
+			move.fromPile === "main"
+				? newState.mainPile
+				: newState.discardStack;
+
+		if (pile.length === 0) {
+			return {
+				illegal: `The ${move.fromPile} pile is empty; cannot draw`,
+			};
+		}
+
+		newState.players[newState.playerTurn].hand.push(pile.pop()!);
+		if (movesRemaining == 1) {
+			newState.playerTurn =
+				(newState.playerTurn + 1) % newState.players.length;
+		}
+		return newState;
+	}
+
+	return { illegal: "idk bruh" };
+};