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const alphabet = 'abcdefgh'
let squares = document.getElementsByClassName('square')
sync_board()
let highlighted_squares = []
//allow ondrop to fire
document.addEventListener("dragover", (e) => e.preventDefault(), false)
function piece_events(e){
e.onclick = e.ondrag = handle_highlight(e.id)
e.draggable = true
e.ondrop = null
}
for (let i = 0; i < squares.length; i++) {
piece_events(squares[i])
}
function handle_highlight(id) {
return function() {
let moves = move(board, id.charCodeAt(0) - 48, id.charCodeAt(1) - 48, to_move)
for (let i = 0; i < highlighted_squares.length; i++) {
highlighted_squares[i].classList.remove('highlight')
piece_events(highlighted_squares[i])
}
for (let i = 0; i < moves.length; i++) {
let hlsquare = document.getElementById(`${moves[i][0]}${moves[i][1]}`)
hlsquare.classList.add('highlight')
hlsquare.ondrop = handle_move(id, hlsquare.id)
hlsquare.onclick = handle_move(id, hlsquare.id)
highlighted_squares.push(hlsquare)
}
}
}
function handle_move(from_id, to_id) {
return function() {
let table = { 1: 'K', 2: 'Q', 3: 'R', 4: 'B', 5: 'N', 6: 'p' }
let from_y = from_id.charCodeAt(0) - 48
let from_x = from_id.charCodeAt(1) - 48
let to_y = to_id.charCodeAt(0) - 48
let to_x = to_id.charCodeAt(1) - 48
let from = board[from_y][from_x]
let to = board[to_y][to_x]
let from_color = board[from_y][from_x] > 0
let to_color = board[to_y][to_x] > 0
let castle = false
let castle_rook_move = []
let prev_y_x = []
let new_y_x = []
prev_y_x.push([from_y, from_x])
new_y_x.push([to_y, to_x])
if (Math.abs(from) == 1 && to == 0) {
if (castle_white_short && from_color && to_y == 7 && to_x == 6) { //white short
prev_y_x.push([7, 7])
new_y_x.push([7, 5])
castle_rook_move.push([7, 7])
castle_rook_move.push([7, 5])
castle = true
}
else if (castle_white_long && from_color && to_y == 7 && to_x == 2) { //white long
prev_y_x.push([7, 0])
new_y_x.push([7, 3])
castle_rook_move.push([7, 0])
castle_rook_move.push([7, 3])
castle = true
}
else if (castle_black_short && !from_color && to_y == 0 && to_x == 6) { //black short
prev_y_x.push([0, 7])
new_y_x.push([0, 5])
castle_rook_move.push([0, 7])
castle_rook_move.push([0, 5])
castle = true
}
else if (castle_black_long && !from_color && to_y == 0 && to_x == 2) { //black long
prev_y_x.push([0, 0])
new_y_x.push([0, 3])
castle_rook_move.push([0, 0])
castle_rook_move.push([0, 3])
castle = true
}
}
make_move(board, prev_y_x, new_y_x)
if (en_passant_move >= 0) {
if (from_color) {
let passanted_pawn = document.getElementById(`3${en_passant_move}`)
while (passanted_pawn.firstChild) {
passanted_pawn.removeChild(passanted_pawn.firstChild)
}
} else {
let passanted_pawn = document.getElementById(`4${en_passant_move}`)
while (passanted_pawn.firstChild) {
passanted_pawn.removeChild(passanted_pawn.firstChild)
}
}
en_passant_move = -1
}
let from_element = document.getElementById(from_id)
let to_element = document.getElementById(to_id)
while (from_element.firstChild) {
from_element.removeChild(from_element.firstChild)
}
while (to_element.firstChild) {
to_element.removeChild(to_element.firstChild)
}
if (castle) {
let from_element = document.getElementById(`${castle_rook_move[0][0]}${castle_rook_move[0][1]}`)
let to_element = document.getElementById(`${castle_rook_move[1][0]}${castle_rook_move[1][1]}`)
while (from_element.firstChild) {
from_element.removeChild(from_element.firstChild)
}
while (to_element.firstChild) {
to_element.removeChild(to_element.firstChild)
}
let piece = document.createElement('p')
piece.classList.add(board[castle_rook_move[1][0]][castle_rook_move[1][1]] > 0 ? 'w' : 'b', 'piece')
piece.append(table[Math.abs(board[castle_rook_move[1][0]][castle_rook_move[1][1]])])
to_element.append(piece)
}
let piece = document.createElement('p')
piece.classList.add(board[to_y][to_x] > 0 ? 'w' : 'b', 'piece')
piece.append(table[Math.abs(board[to_y][to_x])])
to_element.append(piece)
for (let i = 0; i < highlighted_squares.length; i++) {
//highlighted_squares[i].onclick = handle_highlight(highlighted_squares[i].id)
piece_events(highlighted_squares[i])
highlighted_squares[i].classList.remove('highlight')
}
to_move = !to_move
}
}
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