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const SIZE = 100
const MAP = new Int8Array(SIZE * SIZE) // State of the Map
const isFree = ({ x, y }) => MAP[y * SIZE + x] === 0 // 0 = block free
const isOccupied = ({ x, y }) => MAP[y * SIZE + x] === 1 // 1 = block occupied
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const isMe = ai => ai.me // is true if this AI is you
// `inBounds` check if our coord (n) is an existing index in our MAP
const inBounds = n => n < SIZE && n >= 0
// `isInBounds` check that properties x and y of our argument are both in bounds
const isInBounds = ({ x, y }) => inBounds(x) && inBounds(y)
// `pickRandom` get a random element from an array
const pickRandom = arr => arr[Math.floor(Math.random() * arr.length)]
// `addToMap` save the new positions into the map
const addToMap = ({ x, y }) => MAP[y * SIZE + x] = 1
// `update` this function is called at each turn
const update = state => {
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// update is called with a state argument that has 3 properties:
// ais: an array of all the AIs
// ai: the current AI
// Each AIs contains:
// color: A number that represent the color of a AI
// name: A string of the AI name
// score: A number of the total block collected by this AI
// coords: An array of 4 coordinates of the nearest blocks
// Each coordinate (and AI) contains:
// x: The horizontal position
// y: The vertical position
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// index: The computed index of the coord (x * 100 + y)
// cardinal: A number between 0 and 3 that represent the cardinal
// [ 0: NORTH, 1: EAST, 2: SOUTH, 3: WEST ]
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// N
// W + E
// S
//
// direction: A number between 0 and 3 that represent the direction
// [ 0: FORWARD, 1: RIGHT, 2: BACKWARD, 3: LEFT ]
// note that AIs initial cardinal is random (depending on the seed)
// your AI cardinal is the way you are facing
// Saving state between each updates:
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// I update the MAP with the new position of each AIs
state.ais.forEach(addToMap)
// Actual AI logic:
// I filter my array of coords to keep only those that are in bounds
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const coordsInBound = state.ai.coords.filter(isInBounds)
// I filter again to keep coords that are free
const available = coordsInBound.filter(isFree)
// And I return a random available coord
return pickRandom(available)
}