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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 = [],
checkedEnemies = [],
isAttacking = false,
isRoot = true,
}) {
if (isInArray(position, checkedStones)) {
return
}
checkedStones.push(position)
let surroundingSquares = getSurroundingSquares(position)
surroundingSquares.every((z) => {
let s = board.stones[z.y][z.x]
switch (true) {
case s == undefined:
pushIfNotInArray(z, checkedLiberties)
break
case s.team == team:
handleFriendlyStone({
position: z,
team: team,
checkedStones: checkedStones,
checkedLiberties: checkedLiberties,
checkedEnemies: checkedEnemies,
isAttacking: isAttacking,
})
break
case s.team != team:
if (isAttackingEnemyStone({
position: z,
team: s.team,
checkedEnemies: checkedEnemies,
isAttacking: isAttacking,
})) {
isAttacking = true
return false
}
break
}
return true
})
if (isRoot) {
let liberties = checkedLiberties
.filter(x => !Vector2.equals(x, position))
.length
if (liberties > 0 || isAttacking) {
return true
}
return false
}
}
function isInArray(position, array) {
return Array.from(array)
.some(p => Vector2.equals(p, position))
}
function pushIfNotInArray(position, array) {
if (!isInArray(position, array)) {
array.push(position)
}
}
function getSurroundingSquares(position) {
return 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
)
}
function handleFriendlyStone(data) {
checkLiberties({
position: data.position,
team: data.team,
checkedStones: data.checkedStones,
checkedLiberties: data.checkedLiberties,
checkedEnemies: data.checkedEnemies,
isAttacking: data.isAttacking,
isRoot: false,
})
}
function isAttackingEnemyStone({
position,
isAttacking,
checkedEnemies,
}) {
if (isAttacking) {
return
}
let liberties = getEnemyLiberties({
position: position,
team: board.stones[position.y][position.x].team,
checkedEnemies: checkedEnemies,
})
if (liberties == 1) {
return true
}
return false
}
function getEnemyLiberties({
position,
team,
checkedEnemies,
checkedEnemyLiberties = [],
}) {
if (isInArray(position, checkedEnemies)) {
return
}
checkedEnemies.push(position)
getSurroundingSquares(position)
.forEach(z => {
let s = board.stones[z.y][z.x]
switch (true) {
case s == undefined:
pushIfNotInArray(z, checkedEnemyLiberties)
break
case s.team == team:
getEnemyLiberties({
position: z,
team: team,
checkedEnemies: checkedEnemies,
checkedEnemyLiberties: checkedEnemyLiberties,
})
break
}
})
return checkedEnemyLiberties.length
}
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