brass-and-sigil/pack/overrides/kubejs/server_scripts/waystones_policy.js

// Brass & Sigil — Waystones placement policy
//
// Rules:
//   - Regular waystones (6 stone variants): 1 per player. Forces players to
//     build actual transport infrastructure (trains/roads/canals) for
//     long-distance routes instead of waystone-spamming.
//   - Sharestones (16 colors): banned. Pair-teleport between solo-placed
//     sharestones defeats the "build transport" intent, and a sharestone
//     placed just outside someone's claim gives an unrestricted teleport-
//     adjacent vector.
//   - Portstones (16 colors): banned pending separate design discussion.
//   - Warp plates: not restricted (single-block teleport pad; revisit if
//     it becomes a workaround).
//   - Warp scrolls / warp stones: untouched (consumable / cooldown-bound).
//
// Per-player count lives in player.persistentData.bnsWaystoneCount.
// Decrement on break works because waystones-common.toml has
// restrictedWaystones = ["PLAYER"] -- only the owner can break their own
// waystone, so breaker == owner in normal play.

const WAYSTONE_CAP = 1;

const REGULAR_WAYSTONES = new Set([
    'waystones:waystone',
    'waystones:mossy_waystone',
    'waystones:sandy_waystone',
    'waystones:blackstone_waystone',
    'waystones:deepslate_waystone',
    'waystones:end_stone_waystone',
]);

// Build the colored-block ban list once instead of typing 32 strings.
const COLORS = [
    'white', 'orange', 'magenta', 'light_blue', 'yellow', 'lime',
    'pink', 'gray', 'light_gray', 'cyan', 'purple', 'blue',
    'brown', 'green', 'red', 'black',
];
const BANNED_BLOCKS = new Set();
COLORS.forEach(c => {
    BANNED_BLOCKS.add(`waystones:${c}_sharestone`);
    BANNED_BLOCKS.add(`waystones:${c}_portstone`);
});

// Helper: replace the just-placed block with air and refund the item.
function refund(event, blockId) {
    event.block.set('minecraft:air');
    if (event.player) {
        event.player.give(Item.of(blockId));
    }
}

BlockEvents.placed(event => {
    const blockId = event.block.id;
    const player = event.player;

    // Skip non-player placements (dispensers, mob events) -- nothing to refund.
    if (!player) return;

    if (BANNED_BLOCKS.has(blockId)) {
        refund(event, blockId);
        player.tell(Text.red(
            'That block is disabled. Use a regular Waystone (1 per player) ' +
            'and build transport between distant bases.'
        ));
        console.info(`[bns/waystones_policy] denied ${blockId} placement by ${player.username} (banned)`);
        return;
    }

    if (REGULAR_WAYSTONES.has(blockId)) {
        const data = player.persistentData;
        const current = data.getInt('bnsWaystoneCount');
        if (current >= WAYSTONE_CAP) {
            refund(event, blockId);
            player.tell(Text.red(
                `You already have ${WAYSTONE_CAP} waystone. Break your existing one ` +
                `to relocate, or build infrastructure to reach distant bases.`
            ));
            console.info(`[bns/waystones_policy] denied ${blockId} placement by ${player.username} (already at cap ${current})`);
            return;
        }
        data.putInt('bnsWaystoneCount', current + 1);
        console.info(`[bns/waystones_policy] +1 waystone for ${player.username} (now ${current + 1})`);
    }
});

BlockEvents.broken(event => {
    const blockId = event.block.id;
    if (!REGULAR_WAYSTONES.has(blockId)) return;
    const player = event.player;
    if (!player) return;  // explosion / world clear -- accept count drift, rare
    const data = player.persistentData;
    const current = data.getInt('bnsWaystoneCount');
    if (current > 0) {
        data.putInt('bnsWaystoneCount', current - 1);
        console.info(`[bns/waystones_policy] -1 waystone for ${player.username} (now ${current - 1})`);
    }
});