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const SIZE = 100
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const FREE = 0
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const UNSAFE = -1
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const FILLED = 1
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const MAP = new Int8Array(SIZE * SIZE)
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const isFree = ({ x, y }) => MAP[y * SIZE + x] < FILLED
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const isUnsafe = ({ x, y }) => MAP[y * SIZE + x] === UNSAFE
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const setUnsafe = ({ x, y }) => MAP[y * SIZE + x] = UNSAFE
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const setFilled = ({ x, y }) => MAP[y * SIZE + x] = FILLED
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const inBounds = n => n < SIZE && n >= 0
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const isInBounds = ({ x, y }) => inBounds(x) && inBounds(y)
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const isNotBackward = el => el.direction !== 2
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const isForward = el => el.direction === 0
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const isRight = el => el.direction === 1
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const isLeft = el => el.direction === 3
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const goForward = arr => arr.find(isForward)
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const goRight = arr => arr.find(isRight)
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const goLeft = arr => arr.find(isLeft)
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const isOtherPlayer = player => !player.isOwnPlayer
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// `snailIt` goes with the form of a snail
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const snailIt = arr => goRight(arr) || goForward(arr) || goLeft(arr)
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const update = ({ player, players }) => {
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players.forEach(setFilled)
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players
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.filter(isOtherPlayer)
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.flatMap(({ coords }) => coords)
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.filter(isInBounds)
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.filter(isFree)
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.forEach(setUnsafe)
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const coordsInBound = player.coords
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.filter(isInBounds)
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.filter(isNotBackward)
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const available = snailIt(coordsInBound.filter(isFree))
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const lastResort = snailIt(coordsInBound.filter(isUnsafe))
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return available || lastResort
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}
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