// certificates.js - OpenVPN Certificate Statistics Logic

// Access globals defined in PHP
const { apiUrl, refreshTime } = window.AppConfig;

let refreshInterval;
let allCertificatesData = [];
let hideExpired = false;

function getStatusBadge(daysRemaining) {
    if (!daysRemaining || daysRemaining === 'N/A') {
        return '<span class="status-badge text-muted">Unknown</span>';
    }

    if (daysRemaining.includes('Expired')) {
        return '<span class="status-badge status-expired"><i class="fas fa-times-circle me-1"></i>Expired</span>';
    } else if (daysRemaining.includes('days')) {
        const days = parseInt(daysRemaining);
        if (days <= 30) {
            return '<span class="status-badge status-expiring"><i class="fas fa-exclamation-triangle me-1"></i>Expiring Soon</span>';
        } else {
            return '<span class="status-badge status-valid"><i class="fas fa-check-circle me-1"></i>Valid</span>';
        }
    }
    return '<span class="status-badge text-muted">Unknown</span>';
}

function categorizeCertificates(certificates) {
    const active = [];
    const expired = [];

    certificates.forEach(cert => {
        if (!cert.days_remaining || cert.days_remaining === 'N/A') {
            // If days_remaining is not available, check not_after date
            if (cert.not_after && cert.not_after !== 'N/A') {
                try {
                    const expDate = new Date(cert.not_after);
                    const now = new Date();
                    if (expDate < now) {
                        expired.push(cert);
                    } else {
                        active.push(cert);
                    }
                } catch (e) {
                    // If we can't parse the date, consider it active
                    active.push(cert);
                }
            } else {
                // If no expiration info, consider it active
                active.push(cert);
            }
        } else if (cert.days_remaining.includes('Expired')) {
            expired.push(cert);
        } else {
            active.push(cert);
        }
    });

    // Sort active certificates by days remaining (ascending)
    active.sort((a, b) => {
        try {
            const aDays = a.days_remaining && a.days_remaining !== 'N/A' ? parseInt(a.days_remaining) : 9999;
            const bDays = b.days_remaining && b.days_remaining !== 'N/A' ? parseInt(b.days_remaining) : 9999;
            return aDays - bDays;
        } catch (e) {
            return 0;
        }
    });

    // Sort expired certificates by days expired (descending)
    expired.sort((a, b) => {
        try {
            const aMatch = a.days_remaining ? a.days_remaining.match(/\d+/) : [0];
            const bMatch = b.days_remaining ? b.days_remaining.match(/\d+/) : [0];
            const aDays = parseInt(aMatch[0]);
            const bDays = parseInt(bMatch[0]);
            return bDays - aDays;
        } catch (e) {
            return 0;
        }
    });

    return { active, expired };
}

function renderSingleTable(active, expired, tableId) {
    const tableBody = document.getElementById(tableId);
    if ((!active || active.length === 0) && (!expired || expired.length === 0)) {
        tableBody.innerHTML = `
            <tr>
                <td colspan="4" class="empty-state">
                    <i class="fas fa-certificate"></i>
                    <p>No certificates found</p>
                </td>
            </tr>
        `;
        return;
    }

    let html = '';

    // Render Active
    if (active && active.length > 0) {
        html += `<tr class="section-divider"><td colspan="4">Active Certificates (${active.length})</td></tr>`;
        active.forEach(cert => {
            html += generateRow(cert, false);
        });
    }

    // Render Expired
    if (expired && expired.length > 0 && !hideExpired) {
        html += `<tr class="section-divider"><td colspan="4">Expired Certificates (${expired.length})</td></tr>`;
        expired.forEach(cert => {
            html += generateRow(cert, true);
        });
    }

    tableBody.innerHTML = html;
}

function generateRow(cert, isExpired) {
    const commonName = cert.common_name || cert.subject || 'N/A';
    const clientName = commonName.replace('CN=', '').trim();
    let daysText = cert.days_remaining || 'N/A';

    if (isExpired && daysText.includes('Expired')) {
        daysText = daysText.replace('Expired (', '').replace(' days ago)', '') + ' days ago';
    }

    return `
        <tr>
            <td>
                <div class="fw-semibold">${clientName}</div>
                <div class="certificate-file">${cert.file || 'N/A'}</div>
            </td>
            <td>${formatCertDate(cert.not_after)}</td>
            <td class="fw-semibold ${isExpired ? 'text-danger' :
            (daysText !== 'N/A' && parseInt(daysText) <= 30 ? 'text-warning' : 'text-success')
        }">
                ${daysText}
            </td>
            <td>${getStatusBadge(cert.days_remaining)}</td>
        </tr>
    `;
}

function updateSummaryStats(certificates) {
    const totalCertificates = document.getElementById('totalCertificates');
    const activeCertificates = document.getElementById('activeCertificates');
    const expiredCertificates = document.getElementById('expiredCertificates');
    const expiringSoon = document.getElementById('expiringSoon');
    const activeCount = document.getElementById('activeCount');
    const expiredCount = document.getElementById('expiredCount');
    const certCount = document.getElementById('certCount');

    const { active, expired } = categorizeCertificates(certificates);

    let expiringSoonCount = 0;
    active.forEach(cert => {
        if (cert.days_remaining && cert.days_remaining !== 'N/A') {
            const days = parseInt(cert.days_remaining);
            if (days <= 30) {
                expiringSoonCount++;
            }
        }
    });

    totalCertificates.textContent = certificates.length;
    activeCertificates.textContent = active.length;
    expiredCertificates.textContent = expired.length;
    expiringSoon.textContent = expiringSoonCount;
    // Update counts in badges
    document.getElementById('activeCount').textContent = active.length;
    document.getElementById('expiredCount').textContent = expired.length;
    certCount.textContent = certificates.length + ' certificate' + (certificates.length !== 1 ? 's' : '');
}

function filterCertificates() {
    const searchTerm = document.getElementById('searchInput').value.toLowerCase();

    let filteredCertificates = allCertificatesData;

    if (searchTerm) {
        filteredCertificates = allCertificatesData.filter(cert => {
            const commonName = (cert.common_name || cert.subject || '').toLowerCase();
            const fileName = (cert.file || '').toLowerCase();
            return commonName.includes(searchTerm) || fileName.includes(searchTerm);
        });
    }

    const { active, expired } = categorizeCertificates(filteredCertificates);

    renderSingleTable(active, expired, 'certificatesTable');
    updateSummaryStats(filteredCertificates);
}

function toggleExpiredCertificates() {
    hideExpired = document.getElementById('hideExpired').checked;
    const expiredCard = document.getElementById('certificatesCard'); // We just re-render
    filterCertificates();
}

async function fetchData() {
    document.getElementById('refreshIcon').classList.add('refresh-indicator');
    try {
        const response = await fetch(apiUrl);
        const json = await response.json();
        if (json.success) {
            allCertificatesData = json.data;
            filterCertificates(); // This also renders tables
        }
    } catch (e) {
        console.error("Fetch error:", e);
    } finally {
        document.getElementById('refreshIcon').classList.remove('refresh-indicator');
    }
}

// Ensure functionality is available for HTML event attributes
window.fetchData = fetchData;
window.filterCertificates = filterCertificates;
window.toggleExpiredCertificates = toggleExpiredCertificates;

document.addEventListener('DOMContentLoaded', () => {
    initTheme();
    fetchData();
    refreshInterval = setInterval(fetchData, refreshTime);
});