/**
 * Lara Kiesewetter – Live Schachturnier
 * Data fetching, PGN loading, standings, auto-refresh
 */

/* global parsePGN, filterLaraGames, getLiveGame, getTodaysGames, getLatestGame */

async function fetchRoundPGN(round) {
    const res = await fetch(`https://www.deutsche-schachjugend.de/2026/odjm-d/partien/${round}.pgn?t=${Date.now()}`);
    if (!res.ok) return null;
    const buf = await res.arrayBuffer();
    let text = new TextDecoder('utf-8').decode(buf);
    if (text.includes('\uFFFD')) {
        text = new TextDecoder('iso-8859-1').decode(buf);
    }
    return text;
}

async function loadPGN(showOverlay = true) {
    const currentPollId = pollId;
    if (showOverlay) showLoading(true);
    hideError();

    try {
        if (currentRound === 0) {
            if (showOverlay) showLoading(false);
            return;
        }

        const maxRound = currentRound + 1;
        const isFirstLoad = Object.keys(roundPgns).length === 0;
        const startRound = isFirstLoad ? 1 : currentRound;
        for (let r = startRound; r <= maxRound; r++) {
            const text = await fetchRoundPGN(r);
            if (currentPollId !== pollId) return;
            if (text !== null) roundPgns[r] = text;
        }

        const combinedPgn = Object.values(roundPgns).join('\n\n');
        const allGames = parsePGN(combinedPgn);
        allLaraGames = filterLaraGames(allGames);

        if (allLaraGames.length === 0) {
            return;
        }

        if (!userSelectedGame) {
            const liveGame = getLiveGame(allLaraGames);
            const todaysGames = getTodaysGames(allLaraGames);
            currentGame = liveGame || (todaysGames.length > 0 ? getLatestGame(todaysGames) : getLatestGame(allLaraGames));
        } else if (currentGame) {
            const updatedGame = allLaraGames.find(g =>
                g.white === currentGame.white &&
                g.black === currentGame.black &&
                g.round === currentGame.round
            );
            if (updatedGame) currentGame = updatedGame;
        }
        updateBoard();
        updatePlayerInfo();
        updateMovesList();
        updateAllGamesList();
        updatePGNDisplay();
        updateTimestamp();

        showLoading(false);

    } catch (error) {
        if (currentPollId !== pollId) return;
        console.error('Fehler beim Laden:', error);
        showLoading(false);
    }
}

async function updateStandings() {
    try {
        const res = await fetch(`https://www.deutsche-schachjugend.de/2026/odjm-d/tabelle/?t=${Date.now()}`);
        if (!res.ok) throw new Error('Fehler beim Laden');
        const html = await res.text();

        const roundMatch = html.match(/Tabellenstand\s+nach\s+der\s+(\d+)\.\s*Runde/);
        if (roundMatch) {
            currentRound = parseInt(roundMatch[1]);
        }

        const rows = html.matchAll(/<tr[^>]*>(.*?)<\/tr>/gs);
        for (const row of rows) {
            if (!row[1].includes('Lara Kiesewetter')) continue;

            const cells = row[1].matchAll(/<td[^>]*>(.*?)<\/td>/gs);
            const clean = [];
            for (const cell of cells) {
                clean.push(cell[1].replace(/<[^>]+>/g, '').trim());
            }

            if (clean.length >= 9) {
                const data = {
                    rank: clean[0],
                    player: 'Lara Kiesewetter',
                    wins: clean[5],
                    draws: clean[6],
                    losses: clean[7],
                    points: clean[8],
                    round_info: roundMatch ? `nach der ${roundMatch[1]}. Runde` : '',
                    round: currentRound,
                };
                const container = document.getElementById('standings-content');
                container.innerHTML = `
                    <div class="standings-rank">${data.rank}.</div>
                    <div class="standings-rank-label"><a href="https://www.deutsche-schachjugend.de/2026/odjm-d/tabelle/" target="_blank" rel="noopener">Tabellenplatz</a></div>
                    <div class="standings-header">${data.round_info || 'nach Runde 1'}</div>
                    <div class="standings-row">
                        <span class="standings-label">Punkte</span>
                        <span class="standings-value">${data.points}</span>
                    </div>
                    <div class="standings-row">
                        <span class="standings-label">Siege</span>
                        <span class="standings-value">${data.wins}</span>
                    </div>
                    <div class="standings-row">
                        <span class="standings-label">Unentschieden</span>
                        <span class="standings-value">${data.draws}</span>
                    </div>
                    <div class="standings-row">
                        <span class="standings-label">Niederlagen</span>
                        <span class="standings-value">${data.losses}</span>
                    </div>
                `;
                return;
            }
        }
        document.getElementById('standings-content').innerHTML = '<div class="standings-loading">Daten nicht verfügbar</div>';
    } catch {
        document.getElementById('standings-content').innerHTML = '<div class="standings-loading">Daten nicht verfügbar</div>';
    }
}

function updateTimestamp() {
    const time = new Date();
    document.getElementById('last-update').textContent =
        `Letztes Update: ${time.toLocaleTimeString('de-DE')}`;
}

async function startAutoRefresh() {
    clearInterval(pollInterval);
    clearInterval(updateTimer);
    clearInterval(standingsInterval);

    const myId = ++pollId;
    let lastUpdate = Date.now();

    document.getElementById('refresh-timer').textContent = '0s';
    document.getElementById('refresh-timer').style.color = '#4ade80';

    await updateStandings();
    loadPGN(true);

    pollInterval = setInterval(() => {
        if (pollId !== myId) { clearInterval(pollInterval); clearInterval(updateTimer); clearInterval(standingsInterval); return; }
        loadPGN(false);
        lastUpdate = Date.now();
    }, 15000);

    updateTimer = setInterval(() => {
        if (pollId !== myId) { clearInterval(pollInterval); clearInterval(updateTimer); clearInterval(standingsInterval); return; }
        const elapsed = Date.now() - lastUpdate;
        const remaining = Math.max(0, 15000 - elapsed);
        const s = Math.floor(remaining / 1000);
        document.getElementById('refresh-timer').textContent = `${s}s`;
    }, 1000);

    standingsInterval = setInterval(() => {
        if (pollId !== myId) { clearInterval(pollInterval); clearInterval(updateTimer); clearInterval(standingsInterval); return; }
        updateStandings();
    }, 1800000);
}