formation-chess-web 0.2.0

Rules engine and text notation for Formation Chess (阵棋), a strategy board game where piece formations reshape nearby abilities
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import { getIntersection } from './board.js';

export function showMoveHints(moves) {
    clearHints();
    if (!moves) return;

    const byPos = {};
    for (const m of moves) {
        const key = `${m.to[0]},${m.to[1]}`;
        if (!byPos[key]) byPos[key] = [];
        byPos[key].push(m.type);
    }

    for (const [key, types] of Object.entries(byPos)) {
        const [xs, ys] = key.split(',');
        const intn = getIntersection(Number(xs), Number(ys));
        if (!intn) continue;

        let cls = 'hint-multi';
        if (types.includes('capture') && types.includes('push')) {
            cls = 'hint-multi';
        } else if (types.includes('capture')) {
            cls = 'hint-capture';
        } else if (types.includes('push')) {
            cls = 'hint-push';
        }
        intn.classList.add(cls);

        if (types.length > 1) {
            intn.dataset.hintTypes = types.join(',');
        } else {
            intn.dataset.hintType = types[0];
        }
    }
}

export function showPlacementHints(placements) {
    clearHints();
    if (!placements) return;
    for (const [x, y] of placements) {
        const intn = getIntersection(x, y);
        if (intn) {
            intn.classList.add('hint-white');
            intn.dataset.hintType = 'place_white';
        }
    }
}

export function clearHints() {
    for (const el of document.querySelectorAll('.intersection')) {
        el.classList.remove('hint-move', 'hint-capture', 'hint-push', 'hint-multi', 'hint-white');
        delete el.dataset.hintType;
        delete el.dataset.hintTypes;
    }
}

export function clearSelection() {
    for (const el of document.querySelectorAll('.intersection.selected')) {
        el.classList.remove('selected');
    }
}

export function setSelected(x, y) {
    clearSelection();
    clearHints();
    const intn = getIntersection(x, y);
    if (intn) intn.classList.add('selected');
}