async function sendChunk() {
    const ticksToSend = currentTick - lastSentTick;
    if (ticksToSend <= 0) return;

    const payload = {
        sessionId: sessionID,
        inputs: [...inputLog],
        totalTicks: ticksToSend
    };

    inputLog = [];
    lastSentTick = currentTick;

    try {
        const res = await fetch('/api/validate', {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify(payload)
        });

        const data = await res.json();

        if (data.serverObs) serverObstacles = data.serverObs;

        if (data.status === "dead") {
            console.error("SERVER TOT", data);
            gameOver("Vom Server gestoppt");
        } else {
            const sScore = data.verifiedScore;
            if (Math.abs(score - sScore) > 200) score = sScore;
        }
    } catch (e) {
        console.error("Netzwerkfehler:", e);
    }
}

window.submitScore = async function() {
    const nameInput = document.getElementById('playerNameInput');
    const name = nameInput.value;
    const btn = document.getElementById('submitBtn');

    if (!name) return alert("Namen eingeben!");
    btn.disabled = true;

    try {
        const res = await fetch('/api/submit-name', {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify({ sessionId: sessionID, name: name })
        });
        const data = await res.json();

        let myClaims = JSON.parse(localStorage.getItem('escape_claims') || '[]');
        myClaims.push({
            name: name, score: Math.floor(score / 10), code: data.claimCode,
            date: new Date().toLocaleString('de-DE'), sessionId: sessionID
        });
        localStorage.setItem('escape_claims', JSON.stringify(myClaims));

        document.getElementById('inputSection').style.display = 'none';
        loadLeaderboard();
    } catch (e) {}
};

async function loadLeaderboard() {
    const res = await fetch(`/api/leaderboard?sessionId=${sessionID}`);
    const entries = await res.json();
    let html = "<h3>BESTENLISTE</h3>";
    entries.forEach(e => {
        const color = e.isMe ? "yellow" : "white";
        html += `<div style="display:flex; justify-content:space-between; color:${color}; margin-bottom:5px;">
                    <span>#${e.rank} ${e.name}</span><span>${Math.floor(e.score/10)}</span></div>`;
    });
    document.getElementById('leaderboard').innerHTML = html;
}

async function loadStartScreenLeaderboard() {
    try {
        const listEl = document.getElementById('startLeaderboardList');
        if (!listEl) return;
        const res = await fetch('/api/leaderboard');
        const entries = await res.json();
        if (entries.length === 0) { listEl.innerHTML = "<div style='padding:20px'>Noch keine Scores.</div>"; return; }
        let html = "";
        entries.forEach(e => {
            let icon = "#" + e.rank;
            if (e.rank === 1) icon = "🥇"; if (e.rank === 2) icon = "🥈"; if (e.rank === 3) icon = "🥉";
            html += `<div class="hof-entry"><span><span class="hof-rank">${icon}</span> ${e.name}</span><span class="hof-score">${Math.floor(e.score / 10)}</span></div>`;
        });
        listEl.innerHTML = html;
    } catch (e) {}
}