let currentUser = null;
let currentChallenge = null;
let authMethod = null;

function escapeHtml(str) {
    const div = document.createElement('div');
    div.textContent = str;
    return div.innerHTML;
}

// --- Matrix auth ---

function goToMatrixLogin() {
    const slug = window.location.pathname.split('/').filter(Boolean)[0];
    window.location.href = '/' + slug + '/matrix-login';
}

function signOut() {
    sessionStorage.removeItem('matrix_session_token');
    currentUser = null;
    authMethod = null;
    window.location.reload();
}

function showNostrAuth() {
    document.getElementById('auth_method_select').style.display = 'none';
    document.getElementById('nostr_auth_section').style.display = 'block';
}

async function checkMatrixSession() {
    const sessionToken = sessionStorage.getItem('matrix_session_token');
    if (!sessionToken) return false;

    try {
        const slug = window.location.pathname.split('/').filter(Boolean)[0];
        const resp = await fetch('/' + slug + '/matrixVerify', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ session_token: sessionToken })
        });

        if (resp.ok) {
            const data = await resp.json();
            currentUser = { displayName: data.display_name, sessionToken: sessionToken };
            authMethod = 'matrix';

            document.getElementById('auth_section').style.display = 'none';
            document.getElementById('vote_section').style.display = 'block';
            document.getElementById('logged_in_as').textContent = 'Signed in as: ' + data.display_name;

            loadSubmissions();
            return true;
        } else {
            sessionStorage.removeItem('matrix_session_token');
        }
    } catch (e) {
        sessionStorage.removeItem('matrix_session_token');
    }
    return false;
}

// --- Nostr auth ---

function hasNip07() {
    return typeof window.nostr !== 'undefined' && window.nostr !== null;
}

async function connectNip07() {
    if (!hasNip07()) {
        setAuthStatus('No Nostr browser extension detected. Enter your npub manually.', true);
        return;
    }
    try {
        const hexKey = await window.nostr.getPublicKey();
        const resp = await fetch('encode_npub', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ hex: hexKey })
        });
        if (resp.ok) {
            const data = await resp.json();
            document.getElementById('npub_input').value = data.npub;
            document.getElementById('nip07_badge').style.display = 'block';
            setAuthStatus('Connected! Click "Sign In to Vote" to continue.');
        } else {
            document.getElementById('npub_input').value = hexKey;
            setAuthStatus('Connected (using hex key). Click "Sign In to Vote".');
        }
    } catch (err) {
        setAuthStatus('Error: ' + err.message, true);
    }
}

async function authenticate() {
    const npub = document.getElementById('npub_input').value.trim();
    if (!npub) {
        setAuthStatus('Enter your npub or connect AlbyHub first.', true);
        return;
    }

    setAuthStatus('Requesting challenge...');

    try {
        const resp = await fetch('challenge', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ npub: npub })
        });

        if (resp.status === 404) {
            setAuthStatus('Npub not linked. Please <a href="link">link your identity</a> first.', true);
            return;
        }

        if (!resp.ok) {
            const text = await resp.text();
            setAuthStatus('Error: ' + text, true);
            return;
        }

        const data = await resp.json();
        currentChallenge = data.challenge;

        if (!hasNip07()) {
            setAuthStatus('No Nostr extension. Please install AlbyHub to sign.', true);
            return;
        }

        setAuthStatus('Please sign the challenge in your extension...');

        const signedEvent = await window.nostr.signEvent({
            created_at: Math.floor(Date.now() / 1000),
            kind: 1,
            tags: [],
            content: currentChallenge
        });

        currentUser = {
            npub: npub,
            displayName: data.display_name,
            signedEvent: signedEvent
        };
        authMethod = 'nostr';

        document.getElementById('auth_section').style.display = 'none';
        document.getElementById('vote_section').style.display = 'block';
        document.getElementById('logged_in_as').textContent = 'Signed in as: ' + data.display_name;

        loadSubmissions();

    } catch (err) {
        if (err.message && err.message.includes('denied')) {
            setAuthStatus('Signature request denied.', true);
        } else {
            setAuthStatus('Error: ' + err.message, true);
        }
    }
}

function setAuthStatus(msg, isError) {
    const el = document.getElementById('auth_status');
    el.innerHTML = msg;
    el.className = isError ? 'error' : 'success';
}

// --- Submissions ---

async function loadSubmissions() {
    try {
        const response = await fetch('submissions');
        const data = await response.json();

        const submissionList = document.getElementById('suggestion_list');
        submissionList.innerHTML = '';

        if (data.Submissions && data.Submissions.length > 0) {
            data.Submissions.forEach((sub) => {
                const li = document.createElement('li');
                li.innerHTML = `
                    <span class="suggestor">${escapeHtml(sub.submitter)} SUGGESTED</span> :
                    <span class="suggestion">${escapeHtml(sub.submission)}</span>
                    <input type="radio" name="vote" value="${escapeHtml(sub.submission)}" data-submitter="${escapeHtml(sub.submitter)}" data-time="${sub.submission_time}">
                `;
                submissionList.appendChild(li);
            });
        } else {
            submissionList.innerHTML = '<li>No submissions available</li>';
        }
    } catch (error) {
        console.error('Error loading submissions:', error);
        document.getElementById('suggestion_list').innerHTML = '<li>Error loading submissions</li>';
    }
}

// --- Voting ---

async function submitVote() {
    if (!currentUser) {
        alert('Please sign in first');
        return;
    }

    const selectedRadio = document.querySelector('input[name="vote"]:checked');
    if (!selectedRadio) {
        alert('Please select a title to vote for');
        return;
    }

    const voteData = {
        selected_submission: selectedRadio.value,
        submitter: selectedRadio.dataset.submitter,
        submission_time: parseInt(selectedRadio.dataset.time)
    };

    try {
        if (authMethod === 'matrix') {
            const resp = await fetch('matrixVote', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    session_token: currentUser.sessionToken,
                    ...voteData
                })
            });

            if (resp.ok) {
                alert('Vote submitted successfully!');
                selectedRadio.checked = false;
            } else {
                const text = await resp.text();
                alert('Error: ' + text);
            }
        } else if (authMethod === 'nostr') {
            const challengeResp = await fetch('challenge', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ npub: currentUser.npub })
            });

            if (!challengeResp.ok) {
                const text = await challengeResp.text();
                alert('Error getting challenge: ' + text);
                return;
            }

            const challengeData = await challengeResp.json();
            const challengeMsg = challengeData.challenge;

            const signedEvent = await window.nostr.signEvent({
                created_at: Math.floor(Date.now() / 1000),
                kind: 1,
                tags: [],
                content: challengeMsg
            });

            const voteResp = await fetch('verifyVote', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    npub: currentUser.npub,
                    challenge: challengeMsg,
                    ...voteData,
                    signed_event: signedEvent
                })
            });

            if (voteResp.ok) {
                alert('Vote submitted successfully!');
                selectedRadio.checked = false;
            } else {
                const text = await voteResp.text();
                alert('Error: ' + text);
            }
        }
    } catch (error) {
        console.error('Error submitting vote:', error);
        alert('Error submitting vote: ' + error.message);
    }
}

// --- Init ---

document.addEventListener('DOMContentLoaded', async () => {
    setInterval(() => {
        if (currentUser) loadSubmissions();
    }, 30000);

    const matrixAuthed = await checkMatrixSession();
    if (matrixAuthed) return;

    if (hasNip07()) {
        document.getElementById('nip07_badge').style.display = 'block';
    }
});