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const SIZE = 100
4 years ago
const [FREE, FILLED] = Array(3).keys()
const [FORWARD, RIGHT, BACKWARD, LEFT] = Array(4).keys()
const [NORTH, EAST, SOUTH, WEST] = Array(4).keys()
const MAP = new Int8Array(SIZE * SIZE)
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const isFree = ({ x, y }) => MAP[y * SIZE + x] === FREE
const setFilled = ({ x, y }) => MAP[y * SIZE + x] = FILLED
const inBounds = n => n < SIZE && n >= 0
const isInBounds = ({ x, y }) => inBounds(x) && inBounds(y)
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const isNotBackward = el => el.direction !== BACKWARD
const isForward = el => el.direction === FORWARD
const isRight = el => el.direction === RIGHT
const isLeft = el => el.direction === LEFT
const goForward = arr => arr.find(isForward)
const goRight = arr => arr.find(isRight)
const goLeft = arr => arr.find(isLeft)
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const isOtherAI = ai => !ai.me
const isAlive = ai => !ai.dead
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const pickDirection = arr => goLeft(arr) || goForward(arr) || goRight(arr)
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const getNearestWallCardinal = ai => {
const n = ai.y
const e = 99 - ai.x
const s = 99 - ai.y
const w = ai.x
const smallest = Math.min(n, e, s, w)
if (smallest === n) return NORTH
if (smallest === e) return EAST
if (smallest === s) return SOUTH
if (smallest === w) return WEST
}
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let reachForWall = true
const update = ({ ai, ais }) => {
ais.forEach(setFilled)
const enemyCoordsIndices = ais
.filter(isOtherAI)
.filter(isAlive)
.flatMap(ai => ai.coords)
.map(coord => coord.index)
const possibleCoords = ai.coords
.filter(isInBounds)
.filter(isFree)
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const safeCoords = possibleCoords.filter(c => !enemyCoordsIndices.includes(c.index))
if (reachForWall) {
const cardinal = getNearestWallCardinal(ai)
const coord = ai.coords.find(c => c.cardinal === cardinal)
if (safeCoords.includes(coord)) return coord
}
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reachForWall = false
return pickDirection(safeCoords) || pickDirection(possibleCoords)
}
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// hej