/**
 * Lara Kiesewetter – Live Schachturnier
 * Board rendering and move navigation
 */

/* global $, Chess, Chessboard */

function handleMoveClick(e) {
    if (!e.target.classList.contains('move') || !currentGame) return;
    goToMove(parseInt(e.target.dataset.index));
}

function goToMove(index) {
    if (!currentGame) return;

    const nonResultMoves = currentGame.moves.filter(m => !m.isResult);

    if (index < -1) index = -1;
    if (index >= nonResultMoves.length) index = nonResultMoves.length - 1;

    currentMoveIndex = index;

    chess = new Chess();
    for (let i = 0; i <= index; i++) {
        const san = nonResultMoves[i].san;
        let result = chess.move(san);
        if (!result) {
            const cleanSan = san.replace(/^([NBRQK])([a-h])?([1-8])?([a-h][1-8].*)$/, '$1$4');
            result = chess.move(cleanSan);
        }
        if (!result) break;
    }

    board.position(chess.fen(), true);
    highlightActivePlayer();
    highlightLastMove();
    updateClocks(index);
    syncEvalBarHeight();
    updateEvaluation();

    document.querySelectorAll('#moves-list .move').forEach(el => el.classList.remove('current'));
    if (index >= 0) {
        const moveEl = document.querySelector(`#moves-list [data-index="${index}"]`);
        if (moveEl) moveEl.classList.add('current');
    }
}

function updateBoard() {
    if (!currentGame) return;

    const laraIsBlack = currentGame.black.toLowerCase().includes('kiesewetter');
    const orientation = laraIsBlack ? 'black' : 'white';

    const nonResultMoves = currentGame.moves.filter(m => !m.isResult);

    if (currentMoveIndex >= nonResultMoves.length || currentMoveIndex < -1) {
        currentMoveIndex = nonResultMoves.length - 1;
    } else if (previousMoveCount >= 0 && currentMoveIndex === previousMoveCount - 1 && nonResultMoves.length > previousMoveCount) {
        currentMoveIndex = nonResultMoves.length - 1;
    }
    previousMoveCount = nonResultMoves.length;

    chess = new Chess();
    if (currentMoveIndex >= 0) {
        for (let i = 0; i <= currentMoveIndex && i < nonResultMoves.length; i++) {
            const san = nonResultMoves[i].san;
            let result = chess.move(san);
            if (!result) {
                const cleanSan = san.replace(/^([NBRQK])([a-h])?([1-8])?([a-h][1-8].*)$/, '$1$4');
                result = chess.move(cleanSan);
            }
            if (!result) break;
        }
    }

    if (board) {
        board.position(chess.fen(), true);
        board.orientation(orientation);
        board.resize();
        highlightLastMove();
    } else {
        board = Chessboard('board', {
            position: chess.fen(),
            orientation: orientation,
            pieceTheme: 'https://chessboardjs.com/img/chesspieces/wikipedia/{piece}.png',
            draggable: false,
            spawnMoveError: false
        });

        document.getElementById('moves-list').addEventListener('click', handleMoveClick);
    }

    highlightActivePlayer();

    syncEvalBarHeight();
    updateEvaluation();
}