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create-move.ts
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create-move.ts
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import {
failure,
isFailure,
isSome,
none,
Option,
some,
success,
} from "@grancalavera/ttt-etc"
import {
IllegalMoveError,
UnknownPlayerError,
WrongTurnError,
} from "../domain/error"
import {
Match,
MatchState,
Moves,
Player,
Position,
Winner,
} from "../domain/model"
import { domainFailure } from "../domain/result"
import { winSequences } from "../system/board"
import { CreateMoveWorkflow } from "./support"
export const createMove: CreateMoveWorkflow = (dependencies) => async (
input,
) => {
const { upsertMatch, gameSize, maxMoves } = dependencies
const { matchDescription, game, move } = input
const [player, position] = move
const gameIncludesPlayer = game.players.some(({ id }) => id === player.id)
if (!gameIncludesPlayer) {
return failure([new UnknownPlayerError(matchDescription, player)])
}
const playerIsNext = game.next.id === player.id
if (!playerIsNext) {
return failure([new WrongTurnError(matchDescription, player)])
}
const positionAlreadyPlayed = game.moves.some(([, p]) => p === position)
if (positionAlreadyPlayed) {
return failure([new IllegalMoveError(matchDescription, position)])
}
const { players } = game
const [p1, p2] = game.players
const moves = [...game.moves, move] as Moves
const winnerOption = findWinner(winSequences(gameSize), moves)
let state: MatchState
if (isSome(winnerOption)) {
state = { kind: "Victory", players, moves, winner: winnerOption.value }
} else if (moves.length === maxMoves) {
state = { kind: "Draw", players, moves }
} else {
state = {
kind: "Game",
players,
moves,
next: player.id === p1.id ? p2 : p1,
}
}
const match: Match = { ...matchDescription, state }
const upsertResult = await upsertMatch(match)
return isFailure(upsertResult) ? domainFailure(upsertResult) : success(match)
}
const findWinner = (winSequences: number[][], moves: Moves): Option<Winner> => {
const toPlayerByMovePosition = playerFinderByMovePosition(moves)
for (const winSequence of winSequences) {
const players = winSequence.map(toPlayerByMovePosition)
const first = players[0] ?? none
if (
// first move in the win sequence was played
isSome(first) &&
// every move in the sequence was played by the same player
players.every((o) => isSome(o) && o.value.id === first.value.id)
) {
return some([first.value, winSequence])
}
}
return none
}
const playerFinderByMovePosition = (moves: Moves) => (
position: Position,
): Option<Player> => {
const move = moves.find(([, p]) => p === position)
return move ? some(move[0]) : none
}