712 lines
22 KiB
JavaScript
712 lines
22 KiB
JavaScript
'use strict';
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var gun = Gun(['https://jessemcdonald.info/gun']);
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let initialBoard = (function (){
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var init = JSON.stringify({
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'light': [
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'rnbkqbnr',
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'pppppppp',
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' ',
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' ',
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' ',
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' ',
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' ',
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' ',
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],
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'dark': [
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' ',
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' ',
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' ',
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' ',
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' ',
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' ',
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'pppppppp',
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'rnbkqbnr',
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],
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'player': 'light',
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'moves': 0,
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});
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return function (){ return JSON.parse(init); }
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})();
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function cloneJSON(obj){
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return JSON.parse(JSON.stringify(obj));
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}
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function normalizeSide(side){
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return (side[0] === 'd') ? 'dark' : 'light';
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}
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function otherSide(side){
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return (side[0] === 'd') ? 'light' : 'dark';
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}
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function boardGet(board, where, side){
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side = normalizeSide(side);
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if (where === 'phantom') {
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if (!board['phantom'] || board['phantom']['type'][1] !== side[0]) {
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return ' ';
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} else {
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return board['phantom']['type'][0];
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}
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} else {
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var column = 'abcdefgh'.indexOf(where[0]);
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var row = Number(where[1]) - 1;
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return board[side][row][column];
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}
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}
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function boardPut(board, where, side, piece){
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side = (side[0] === 'd') ? 'dark' : 'light';
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var column = 'abcdefgh'.indexOf(where[0]);
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var row = Number(where[1]) - 1;
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var data = board[side][row];
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var prefix = data.substring(0, column);
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var suffix = data.substring(column + 1, 8);
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board[side][row] = prefix + piece + suffix;
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}
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function countMoves(board) {
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var n = 0;
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while (board && board['prior']) {
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if (board['player'] === 'light' && board['prior']['player'] !== 'light') {
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++n;
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}
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board = board['prior'];
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}
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return n;
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}
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function offsetSquare(from, columnsRight, rowsUp){
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var column = 'abcdefgh'.indexOf(from[0]);
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var row = Number(from[1]) - 1;
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if (column < 0 || column > 7 || row < 0 || row > 7) {
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return null;
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}
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column += columnsRight;
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row += rowsUp;
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if (column < 0 || column > 7 || row < 0 || row > 7) {
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return null;
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}
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return 'abcdefgh'[column] + String(row + 1);
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}
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function validDestination(board, side, where, canCapture){
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var ours = boardGet(board, where, side);
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var theirs = boardGet(board, where, otherSide(side));
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return ((theirs === ' ') ? (ours === ' ') : canCapture);
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}
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function scanPath(accum, board, side, from, canCapture, columnsLeft, rowsUp, remainder){
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while (true) {
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var there = offsetSquare(from, columnsLeft, rowsUp);
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if (!there || !validDestination(board, side, there, canCapture)) { return; }
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accum.push(there);
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if (boardGet(board, there, otherSide(side)) !== ' ' || remainder < 1) { return; }
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from = there;
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remainder -= 1;
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}
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}
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function hasMoved(board, side, from){
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while (true) {
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if (!board || !board['move']) {
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return false;
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}
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if (!board['move']['pass'] && board['move']['side'][0] === side[0]) {
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if (board['move']['to'] === from) {
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return true;
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}
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}
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board = board['prior'];
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}
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}
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function legalMoves(board, side, type, from, canCapture){
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if (board['move'] && board['move']['took'] && board['move']['took'][0] === 'k') {
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return [];
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}
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const ortho = [[-1, 0], [1, 0], [0, -1], [0, 1]];
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const diag = [[-1, -1], [-1, 1], [1, -1], [1, 1]];
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var legals = [];
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if (from === 'phantom') {
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from = board['phantom']['from'];
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}
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if (type === 'k') {
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for (const dir of ortho.concat(diag)) {
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scanPath(legals, board, side, from, false, dir[0], dir[1], 0);
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}
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if (from[0] === 'd' && from[1] === (side[0] === 'd' ? '8' : '1')) {
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/* check for castling conditions */
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if (!hasMoved(board, side, from)) {
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if (boardGet(board, 'c' + from[1], side) === ' ' &&
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boardGet(board, 'b' + from[1], side) === ' ' &&
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boardGet(board, 'a' + from[1], side) === 'r') {
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if (!hasMoved(board, side, 'a' + from[1])) {
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legals.push('b' + from[1]);
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}
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}
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if (boardGet(board, 'e' + from[1], side) === ' ' &&
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boardGet(board, 'f' + from[1], side) === ' ' &&
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boardGet(board, 'g' + from[1], side) === ' ' &&
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boardGet(board, 'h' + from[1], side) === 'r') {
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if (!hasMoved(board, side, 'h' + from[1])) {
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legals.push('f' + from[1]);
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}
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}
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}
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}
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} else if (type === 'q') {
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for (const dir of ortho.concat(diag)) {
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scanPath(legals, board, side, from, canCapture, dir[0], dir[1], 8);
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}
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} else if (type === 'b') {
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for (const dir of diag) {
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scanPath(legals, board, side, from, canCapture, dir[0], dir[1], 8);
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}
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} else if (type === 'n') {
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for (const there of [offsetSquare(from, -1, 2), offsetSquare(from, 1, 2),
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offsetSquare(from, -2, 1), offsetSquare(from, 2, 1),
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offsetSquare(from, -2, -1), offsetSquare(from, 2, -1),
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offsetSquare(from, -1, -2), offsetSquare(from, 1, -2)]) {
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if (there && validDestination(board, side, there, canCapture)) {
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legals.push(there);
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}
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}
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} else if (type === 'r') {
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for (const dir of ortho) {
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scanPath(legals, board, side, from, canCapture, dir[0], dir[1], 8);
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}
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} else if (type === 'p') {
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var forward = offsetSquare(from, 0, (side[0] === 'd') ? -1 : 1);
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var forward2 = offsetSquare(from, 0, (side[0] === 'd') ? -2 : 2);
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var diagL = offsetSquare(from, -1, (side[0] === 'd') ? -1 : 1);
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var diagR = offsetSquare(from, 1, (side[0] === 'd') ? -1 : 1);
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if (forward && validDestination(board, side, forward, false)) {
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legals.push(forward);
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if ((side[0] === 'd') ? (from[1] >= '7') : (from[1] <= '2')) {
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if (forward2 && validDestination(board, side, forward2, false)) {
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legals.push(forward2);
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}
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}
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}
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if (canCapture) {
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for (const there of [diagL, diagR]) {
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if (there) {
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if (boardGet(board, there, otherSide(side)) !== ' ') {
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legals.push(there);
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} else {
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var otherBoard = board;
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while (otherBoard && otherBoard['move'] && otherBoard['move']['side'][0] === side[0]) {
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otherBoard = otherBoard['prior'];
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}
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if (otherBoard && otherBoard['move']) {
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const move = otherBoard['move'];
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if (move['side'][0] !== side[0] && move['type'] === 'p') {
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const from = (move['from'] === 'phantom')
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? otherBoard['prior']['phantom']['from'] : move['from'];
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if (from[0] === there[0] && from[1] === forward2[1]) {
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/* en passant */
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legals.push(there);
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}
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}
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}
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}
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}
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}
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}
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}
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return legals;
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}
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function movePiece(priorBoard, side, from, to){
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var other = otherSide(side);
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var type = boardGet(priorBoard, from, side);
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var took = boardGet(priorBoard, to, other);
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var replaced = boardGet(priorBoard, to, side);
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var alongside = boardGet(priorBoard, from, other);
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var actuallyFrom = (from === 'phantom') ? priorBoard['phantom']['from'] : from;
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const legals = legalMoves(priorBoard, side, type, from, alongside === ' ');
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if (!legals.includes(to)) {
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return priorBoard;
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}
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var undoBoard = priorBoard;
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if (undoBoard['subsequent']) {
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undoBoard = cloneJSON(undoBoard);
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delete undoBoard['subsequent'];
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}
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var board = cloneJSON(undoBoard);
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board['prior'] = undoBoard;
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board['move'] = {
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'side': normalizeSide(side),
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'type': type,
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'from': from,
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'to': to
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};
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if (took !== ' ') {
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board['move']['took'] = took;
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}
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if (replaced !== ' ') {
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board['move']['replaced'] = replaced;
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}
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if (alongside !== ' ') {
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board['move']['alongside'] = alongside;
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}
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if (type === 'k' && actuallyFrom[0] === 'd' && to[0] === 'b') {
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board['move']['castle'] = true;
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boardPut(board, 'a' + actuallyFrom[1], side, ' ');
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boardPut(board, 'c' + actuallyFrom[1], side, 'r');
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}
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if (type === 'k' && actuallyFrom[0] === 'd' && to[0] === 'f') {
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board['move']['queen_castle'] = true;
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boardPut(board, 'h' + actuallyFrom[1], side, ' ');
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boardPut(board, 'e' + actuallyFrom[1], side, 'r');
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}
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if (type === 'p' && ((side[0] === 'd') ? (to[1] === '1') : (to[1] === '8'))) {
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board['move']['promotion'] = 'queen'; /* TODO: allow other choices */
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type = 'q';
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}
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if (alongside === 'p' && ((other[0] === 'd') ? (to[1] === '1') : (to[1] === '8'))) {
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board['move']['promotion'] = 'queen'; /* TODO: allow other choices */
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alongside = 'q';
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}
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if (type === 'p' && alongside === ' ' && to[0] !== actuallyFrom[0]) {
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var otherBoard = priorBoard;
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while (otherBoard && otherBoard['move'] && otherBoard['move']['side'][0] === side[0]) {
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otherBoard = otherBoard['prior'];
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}
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if (otherBoard && otherBoard['move']) {
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const move = otherBoard['move'];
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if (move['type'] === 'p' && move['to'][0] === to[0] && move['to'][1] === actuallyFrom[1]) {
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const moveFrom = (move['from'] === 'phantom') ? otherBoard['prior']['phantom']['from'] : move['from'];
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if (move['side'][0] === other[0] && moveFrom[1] != to[1]) {
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board['move']['en_passant'] = true;
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alongside = 'p';
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boardPut(board, move['to'], other, ' ');
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}
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}
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}
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}
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if (from === 'phantom') {
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delete board['phantom'];
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} else {
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boardPut(board, from, side, ' ');
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boardPut(board, from, other, ' ');
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}
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boardPut(board, to, side, type);
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if (alongside !== ' ') {
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boardPut(board, to, other, alongside);
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}
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if (replaced === ' ') {
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board['player'] = otherSide(board['player']);
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} else {
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board['phantom'] = { 'from': to, 'type': replaced + side[0] };
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}
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return board;
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}
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function renderHistory(board) {
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var list = [];
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while (board && board['move']) {
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list.push(board['move']);
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board = board['prior'];
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}
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var result = '';
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var n = 0;
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while (list.length > 0) {
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const move = list.pop();
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if (move['from'] === 'phantom') {
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const took = move['took'] ? 'x' : '';
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result += '*' + move['type'].toUpperCase() + took + move['to'];
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} else {
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if (n > 0 || move['side'] === 'dark') {
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result += ' ';
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}
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if (move['side'] === 'light') {
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++n;
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result += String(n) + '. ';
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}
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if (move['pass']) {
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result += '...';
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} else if (move['alongside']) {
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if (move['side'] === 'light') {
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result += move['type'].toUpperCase() + move['alongside'].toUpperCase() + move['from'] + move['to'];
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} else {
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result += move['alongside'].toUpperCase() + move['type'].toUpperCase() + move['from'] + move['to'];
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}
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} else if (move['castle']) {
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result += 'O-O';
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} else if (move['queen_castle']) {
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result += 'O-O-O';
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} else {
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const took = move['took'] ? 'x' : '';
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result += move['type'].toUpperCase() + move['from'] + took + move['to'];
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}
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}
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if (move['en_passant']) {
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result += 'e.p.';
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}
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if (move['promotion']) {
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result += '(' + move['promotion'][0].toUpperCase() + ')';
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}
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if (move['took'] && move['took'][0] === 'k') {
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result += '#';
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}
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}
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return result;
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}
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function pieceStartDrag(ev, ui){
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const board = $('#cb_board').data('board');
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const dragged = $(this);
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const type = dragged.data('type');
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const from = dragged.data('location');
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const where = (from === 'phantom') ? board['phantom']['from'] : from;
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const canCapture = boardGet(board, from, otherSide(type[1])) === ' ';
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const legals = legalMoves(board, type[1], type[0], where, canCapture);
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for (const there of legals) {
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$('#cb_' + there).addClass('cb-legal').droppable('enable');
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}
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}
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function pieceStopDrag(ev, ui){
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$('#cb_board .cb-legal').removeClass('cb-legal').droppable('disable');
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}
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function placePiece(where, type, count){
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var piece_id = 'cb_piece_' + type + '_' + count;
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var piece = $($('#' + piece_id)[0] || $('#cb_piece_' + type + ' img').clone());
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piece.attr('style', '');
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piece.attr('id', piece_id);
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piece.data({ 'type': type, 'location': where });
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piece.appendTo('#cb_' + where);
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piece.draggable({
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disabled: true,
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containment: '#cb_inner',
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revert: 'invalid',
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zIndex: 100,
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start: pieceStartDrag,
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stop: pieceStopDrag,
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});
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return piece;
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}
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function renderBoard(board){
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$('#cb_board .cb-piece .ui-draggable').draggable('destroy');
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$('#cb_board .cb-piece').attr('style', '').appendTo('#cb_hidden');
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$('#cb_board .cb-start').removeClass('cb-start');
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$('#cb_board .cb-end').removeClass('cb-end');
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$('#cb_phantom').appendTo('#cb_hidden');
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for (const side of ['light', 'dark']) {
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var counters = {};
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for (var row = 0; row < 8; ++row) {
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for (var column = 0; column < 8; ++column) {
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var here = 'abcdefgh'[column] + String(row+1);
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var type = board[side][row][column];
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if (type !== ' ') {
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if (!counters[type]) {
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counters[type] = 0;
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}
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var count = ++counters[type];
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placePiece(here, type + side[0], count);
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}
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}
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}
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}
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var clss = board['player'] === 'light' ? '.cb-lt-piece' : '.cb-dk-piece';
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if (board['phantom']) {
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var where = board['phantom']['from'];
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placePiece('phantom', board['phantom']['type'], 'ph');
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$('#cb_phantom').appendTo('#cb_' + where);
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$('#cb_board .ui-draggable').draggable('disable');
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$('#cb_phantom .ui-draggable-disabled').filter(clss).draggable('enable');
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} else {
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$('#cb_board .ui-draggable-disabled').filter(clss).draggable('enable');
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}
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if (board['move']) {
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if (board['move']['from'] === 'phantom') {
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$('#cb_' + board['prior']['move']['to']).addClass('cb-start');
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} else {
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$('#cb_' + board['move']['from']).addClass('cb-start');
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}
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$('#cb_' + board['move']['to']).addClass('cb-end');
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}
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var msg = '';
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if (board['move'] && board['move']['took'] && board['move']['took'][0] === 'k') {
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msg = (board['move']['side'][0] === 'd' ? 'Dark' : 'Light') + ' player won!';
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} else {
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msg = (board['player'][0] === 'd' ? 'Dark' : 'Light') + " player's move";
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}
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$('#cb_message').text(msg);
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$('#cb_history').text(renderHistory(board));
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$('#cb_undo').attr('disabled', board['prior'] ? false : true);
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$('#cb_redo').attr('disabled', board['subsequent'] ? false : true);
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$('#cb_pass').attr('disabled', board['phantom'] ? true : false);
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}
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function randomId(){
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var res = '';
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for (var i = 0; i < 4; ++i) {
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var part = Math.floor(Math.random() * 65536).toString(16);
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res = res + ('0000'.substring(part.length, 4) + part);
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}
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return res;
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}
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var PacoSakoUUID = '7c38edd4-c931-49c8-9f1a-84de560815db';
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function putState(board){
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var boardElem = $('#cb_board');
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var gameId = boardElem.data('gameId');
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var game = gun.get(PacoSakoUUID).get('games').get(gameId);
|
|
game.put({ 'board': JSON.stringify(board) });
|
|
putMeta();
|
|
}
|
|
|
|
function putMeta(){
|
|
var board = $('#cb_board').data('board');
|
|
var gameId = $('#cb_board').data('gameId');
|
|
var lightName = $('#cb_light_name').val();
|
|
var darkName = $('#cb_dark_name').val();
|
|
var meta = gun.get(PacoSakoUUID).get('meta').get(gameId);
|
|
meta.put({
|
|
'gameId': gameId,
|
|
'lightName': lightName,
|
|
'darkName': darkName,
|
|
'moves': countMoves(board),
|
|
'timestamp': new Date().getTime()
|
|
});
|
|
}
|
|
|
|
function switchGameId(newId){
|
|
var boardElem = $('#cb_board');
|
|
var gameId = boardElem.data('gameId');
|
|
|
|
if (newId === gameId) {
|
|
return;
|
|
}
|
|
|
|
if (gameId) {
|
|
//gun.get(PacoSakoUUID).get('games').get(gameId).off();
|
|
//gun.get(PacoSakoUUID).get('meta').get(gameId).off();
|
|
}
|
|
|
|
boardElem.data('gameId', newId);
|
|
location.hash = '#/' + newId;
|
|
|
|
/* this will be the starting state if no data is received from peers */
|
|
var newBoard = initialBoard();
|
|
boardElem.data('board', newBoard);
|
|
renderBoard(newBoard);
|
|
|
|
gun.get(PacoSakoUUID).get('games').get(newId).on(function(d){
|
|
if (d && d['board'] && $('#cb_board').data('gameId') === newId) {
|
|
var board = JSON.parse(d['board']);
|
|
$('#cb_board').data('board', board);
|
|
renderBoard(board);
|
|
}
|
|
});
|
|
|
|
$('#cb_light_name').val('');
|
|
$('#cb_dark_name').val('');
|
|
|
|
gun.get(PacoSakoUUID).get('meta').get(newId).on(function(d){
|
|
if (d && $('#cb_board').data('gameId') === newId) {
|
|
$('#cb_light_name').val(d['lightName'] || '');
|
|
$('#cb_dark_name').val(d['darkName'] || '');
|
|
}
|
|
});
|
|
|
|
var selOpt = $('#cb_game_' + newId);
|
|
if (selOpt.length === 1) {
|
|
$('#cb_select_game')[0].selectedIndex = selOpt.index();
|
|
} else {
|
|
$('#cb_select_game')[0].selectedIndex = -1;
|
|
}
|
|
}
|
|
|
|
$(function (){
|
|
$('.cb-square').droppable({
|
|
accept: '.cb-piece',
|
|
disabled: true,
|
|
deactivate: function(ev, ui){
|
|
$(this).droppable('disable');
|
|
},
|
|
drop: function(ev, ui) {
|
|
var dragged = ui.draggable;
|
|
var type = dragged.data('type');
|
|
var from = dragged.data('location');
|
|
var to = this.id.replace(/^cb_/, '');
|
|
dragged.appendTo('#cb_hidden');
|
|
|
|
var newBoard = movePiece($('#cb_board').data('board'), type[1], from, to);
|
|
putState(newBoard);
|
|
},
|
|
});
|
|
|
|
$('#cb_undo').on('click', function(){
|
|
var board = $('#cb_board').data('board');
|
|
if (board['prior']) {
|
|
var newBoard = cloneJSON(board['prior']);
|
|
var redoBoard = cloneJSON(board);
|
|
delete redoBoard['prior'];
|
|
newBoard['subsequent'] = redoBoard;
|
|
putState(newBoard);
|
|
}
|
|
});
|
|
|
|
$('#cb_redo').on('click', function(){
|
|
var board = $('#cb_board').data('board');
|
|
if (board['subsequent']) {
|
|
var newBoard = cloneJSON(board['subsequent']);
|
|
var undoBoard = cloneJSON(board);
|
|
delete undoBoard['subsequent'];
|
|
newBoard['prior'] = undoBoard;
|
|
putState(newBoard);
|
|
}
|
|
});
|
|
|
|
$('#cb_reset').on('click', function(){
|
|
putState(initialBoard());
|
|
});
|
|
|
|
$('#cb_pass').on('click', function(){
|
|
var board = $('#cb_board').data('board');
|
|
if (!board['phantom']) {
|
|
var newBoard = cloneJSON(board);
|
|
newBoard['prior'] = board;
|
|
newBoard['move'] = { 'side': board['player'], 'pass': true };
|
|
newBoard['player'] = otherSide(board['player']);
|
|
putState(newBoard);
|
|
}
|
|
});
|
|
|
|
$('#cb_select_game').on('change', function(){
|
|
var optIndex = $('#cb_select_game')[0].selectedIndex;
|
|
if (optIndex === 0) {
|
|
switchGameId(randomId());
|
|
} else if (optIndex >= 1) {
|
|
var opt = $('#cb_select_game option')[optIndex];
|
|
if (opt) {
|
|
switchGameId(opt.id.replace(/^cb_game_/, ''));
|
|
}
|
|
}
|
|
});
|
|
|
|
let updateMeta = function() { putMeta(); }
|
|
$('#cb_light_name').on('input', updateMeta);
|
|
$('#cb_dark_name').on('input', updateMeta);
|
|
|
|
gun.get(PacoSakoUUID).get('meta').map().on(function(d){
|
|
if (d && d['gameId']) {
|
|
function updateTitle(opt){
|
|
const then = opt.data('then');
|
|
const now = new Date().getTime();
|
|
var age_str = '';
|
|
if (then > now) {
|
|
age_str = ' (future)';
|
|
} else if ((now - then) < 60*60*1000) {
|
|
age_str = ' (' + Math.floor((now - then) / (60*1000)) + 'm)';
|
|
} else if ((now - then) < 24*60*60*1000) {
|
|
age_str = ' (' + Math.floor((now - then) / (60*60*1000)) + 'h)';
|
|
} else if ((now - then) < 14*24*60*60*1000) {
|
|
age_str = ' (' + Math.floor((now - then) / (24*60*60*1000)) + 'd)';
|
|
} else if (d['gameId'] !== $('#cb_board').data('gameId')) {
|
|
opt.remove();
|
|
return;
|
|
}
|
|
opt.text(opt.data('title') + age_str);
|
|
}
|
|
|
|
var opt = $('#cb_game_' + d['gameId']);
|
|
if (opt.length === 0) {
|
|
opt = $('<option></option>');
|
|
opt.attr('id', 'cb_game_' + d['gameId']);
|
|
|
|
function refreshTitle(){
|
|
updateTitle(opt);
|
|
window.setTimeout(refreshTitle, 15000);
|
|
};
|
|
|
|
window.setTimeout(refreshTitle, 0);
|
|
}
|
|
|
|
const lightName = d['lightName'] ? d['lightName'] : 'Light';
|
|
const darkName = d['darkName'] ? d['darkName'] : 'Dark';
|
|
const moves = !d['moves'] ? '' :
|
|
(', ' + d['moves'] + (d['moves'] === 1 ? ' move' : ' moves'));
|
|
|
|
opt.data('title', lightName + ' vs. ' + darkName + moves);
|
|
opt.data('then', d['timestamp'] || new Date().getTime());
|
|
opt.addClass('cb-game-option');
|
|
opt.appendTo('#cb_select_game');
|
|
updateTitle(opt);
|
|
|
|
var select = $('#cb_select_game');
|
|
var list = select.children('.cb-game-option').get();
|
|
list.sort(function(a,b) {
|
|
const then_a = $(a).data('then');
|
|
const then_b = $(b).data('then');
|
|
return (then_a < then_b) ? 1 : (then_a === then_b) ? 0 : -1;
|
|
});
|
|
|
|
for (const e of list) {
|
|
$(e).appendTo(select);
|
|
}
|
|
|
|
var selOpt = $('#cb_game_' + $('#cb_board').data('gameId'));
|
|
if (selOpt.length === 1) {
|
|
$('#cb_select_game')[0].selectedIndex = selOpt.index();
|
|
} else {
|
|
$('#cb_select_game')[0].selectedIndex = -1;
|
|
}
|
|
}
|
|
});
|
|
|
|
var gameId = location.hash.replace(/^#\//, '');
|
|
if (gameId.length !== 16) {
|
|
gameId = randomId();
|
|
}
|
|
|
|
switchGameId(gameId);
|
|
});
|
|
|
|
/* vim:set expandtab sw=3 ts=8: */
|