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const express = require('express');
const app = express();
const http = require('http').Server(app);
const path = require('path');
const io = require('socket.io')(http);
const allEqual = (arr) =>
arr.includes(2) ? false : arr.every(i => i === arr[0])
const getRow = (board, r) => board.slice(r * 3, (r * 3) + 3);
const getRows = (board, r = 0) =>
r <= 2 ? [getRow(board, r)].concat(getRows(board, r+1)) : getRow(board, r)
const getCol = (board, c) => board.map((i) => i[c])
const getCols = (rows, c = 0) =>
c < 2 ? [getCol(rows, c)].concat(getCols(rows, c+1)) : [getCol(rows, c)]
const getLeftDiagonal = (board, i = 0) =>
i < 3 ? [getRow(board, i)[i]].concat(getLeftDiagonal(board, i+1)) : [];
const getRightDiagonal = (board, i = 2) =>
i >= 0 ? [getRow(board, 2-i)[i]].concat(getRightDiagonal(board, i-1)) : [];
io.on('connection', (socket) => {
socket.on('update-remote-data', (data) => {
console.log(data)
if (data.board.includes(0) || data.board.includes(1)) {
const rows = getRows(data.board);
(rows.some((i) => allEqual(i))
|| getCols(rows).some((i) => allEqual(i))
|| [getLeftDiagonal(data.board), getRightDiagonal(data.board)].some((i) => allEqual(i))
) ? io.emit('set winner', data.turn) : (data.board.includes(2) || io.emit('set draw'))
}
io.emit('update-client-data', {board: data.board, turn: data.turn === 0 ? 1 : 0});
})
});
// serve static front end
app.use(express.static(path.join(__dirname, '../../build')));
// Start the server
const PORT = process.env.PORT || 5000;
http.listen(PORT, () => {
console.log(`App listening on port ${PORT}`);
});
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