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import { board } from "../board.js"
import { Vector2 } from "../engine/vector2.js"
const SURROUNDING = [
new Vector2(-1, 0),
new Vector2(0, 1),
new Vector2(0, -1),
new Vector2(1, 0),
]
export function hasLiberties({
position,
team
}) {
return checkLiberties({
position,
team
})
}
function checkLiberties({
position,
team,
checkedStones = [],
checkedLiberties = [],
}) {
if (
Array.from(checkedStones)
.some(p => Vector2.equals(p, position))
) {
return false
}
checkedStones.push(position)
let surroundingSquares = Array.from(SURROUNDING)
.map(v => Vector2.sum(v, position))
.filter(z => 0 <= z.x && z.x < board.size &&
0 <= z.y && z.y < board.size
)
surroundingSquares
.filter(z => board.stones[z.y][z.x] == undefined)
.forEach(z => {
if (!Array.from(checkedStones)
.some(p => Vector2.equals(p, z))
) {
checkedLiberties.push(z)
}
})
surroundingSquares
.filter(z => board.stones[z.y][z.x] != undefined)
.filter(z => board.stones[z.y][z.x].team == team)
.forEach(z => {
checkLiberties({
position: z,
team: team,
checkedStones: checkedStones,
checkedLiberties: checkedLiberties,
})
})
if (checkedLiberties.length > 0) {
return true
}
return false
}
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