import { html, PageHeader, definePage, getModel, renderGuardMulti, ServiceStatus, StatCard, Table, Badge, ActionButton } from '/static/hoover/index.js';

function fmtBytes(bytes) {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return (bytes / Math.pow(k, i)).toFixed(i > 0 ? 1 : 0) + ' ' + sizes[i];
}

export default definePage({
    init() {
        return {
            firewall: getModel('firewall'),
            network: getModel('network'),
            dnsmasq: getModel('dnsmasq'),
            wireguard: getModel('wireguard'),
            acme: getModel('acme'),
            nginx: getModel('nginx'),
            status: getModel('status'),
        };
    },
    render(state) {
        const guard = renderGuardMulti('Dashboard', 'System overview',
            state.firewall, state.network, state.dnsmasq, state.wireguard,
            state.acme, state.nginx, state.status);
        if (guard) return guard;

        // Extract data
        const fwIfaces = Array.isArray(state.firewall.data?.interfaces) ? state.firewall.data.interfaces : [];
        const fwZones = state.firewall.data?.zones || {};
        const netIfaces = state.network.data?.interfaces || {};
        const dnsmasqStatus = state.dnsmasq.data?.status || {};
        const dnsmasqLeases = state.dnsmasq.data?.leases || [];
        const activeLeaseCount = dnsmasqStatus.active_leases || dnsmasqLeases.length;
        const proxyDomains = state.nginx.data?.domains || [];
        const onlineDomains = proxyDomains ? proxyDomains.filter(d => d.online).length : 0;
        const offlineDomains = (proxyDomains?.length || 0) - onlineDomains;
        const wgp = state.wireguard.data?.peers || [];
        const wgStatus = state.wireguard.data?.status || {};
        const allCerts = state.acme.data?.certs || [];
        const expiringCerts = allCerts.filter(c => c.expired || (c.days_remaining !== undefined && c.days_remaining <= 30));

        // System metrics from status model
        const sysMetrics = state.status.data?.metrics || {};
        const sysLoad = sysMetrics.load || {};
        const sysMem = sysMetrics.memory || {};
        const sysSwap = sysMetrics.swap || {};
        const sysTraffic = sysMetrics.traffic || {};

        // Pending changes
        const pend = state.status.data?.pending || {};
        const totalChanges = pend.total_changes || 0;
        const pendKeys = ['firewall', 'dnsmasq', 'nginx', 'wireguard', 'networkd'].filter(k =>
            k === 'firewall' ? (pend[k]?.needs_apply) : (pend[k]?.pending_changes)
        );
        const pendLabels = { firewall: 'Firewall', dnsmasq: 'DHCP', nginx: 'Proxy', wireguard: 'WireGuard', networkd: 'Network' };

        // Build merged interface list
        const allNames = [...new Set([...fwIfaces.map(f => f.name), ...Object.keys(netIfaces)])];
        const ifaces = allNames.map(name => {
            const fw = fwIfaces.find(f => f.name === name);
            const netEntry = netIfaces[name] || {};
            const traffic = sysTraffic[name] || {};
            const ips = fw ? [...(fw.ips || []), ...(fw.ipv6 || [])] : [];
            const addrs = netEntry?.addresses || [];
            const isUp = ['routable', 'degraded'].some(s => (netEntry.state || '').startsWith(s));
            return {
                name,
                mac: fw?.mac || null,
                ips: ips.length ? ips : addrs,
                isUp,
                zone: fw?.zone || '—',
                rx: traffic.rx_bytes || 0,
                tx: traffic.tx_bytes || 0,
            };
        });

        // ── Stat cards ──
        const zoneNames = Object.keys(fwZones);
        const stats = html`<div class="grid grid-4">
            <${StatCard} label="Active Zones" value=${zoneNames.length}
                meta=${zoneNames.join(', ') || 'None'} />
            <${StatCard} label="DHCP Leases" value=${activeLeaseCount}
                meta=${dnsmasqLeases.slice(0, 3).map(l => l.hostname || l.mac).join(', ') || 'None'} />
            <${StatCard} label="Proxy Domains" value=${onlineDomains + '/' + (proxyDomains?.length || 0)}
                meta=${offlineDomains + ' offline'} />
            <${StatCard} label="Certificates" value=${allCerts.length}
                meta=${expiringCerts.length ? expiringCerts.length + ' expiring' : 'All valid'} />
        </div>`;

        // ── Pending changes ──
        const pendingCard = pendKeys.length > 0
            ? html`<div class="card">
                <div class="card-header">Pending Changes <span style="margin-left:8px"><${Badge} text=${String(totalChanges)} variant="warning" /></span></div>
                <div class="card-body">
                    <p class="text-sm">Unapplied changes in: ${pendKeys.map(k => pendLabels[k]).join(', ')}</p>
                    <${ActionButton} url="/api/status/apply-all" label="Apply All Changes"
                        successMsg="All changes applied" refresh="status"
                        cls="btn btn-sm btn-primary" />
                </div>
            </div>`
            : html`<div class="card">
                <div class="card-header">Pending Changes</div>
                <div class="card-body"><${Badge} text="All configured" variant="success" /></div>
            </div>`;

        // ── System resources ──
        const memPct = sysMem.used_pct || 0;
        const memVariant = memPct > 80 ? 'danger' : memPct > 60 ? 'warning' : 'success';
        const swapPct = sysSwap.used_pct || 0;
        const swapVariant = swapPct > 50 ? 'warning' : 'success';
        const systemCard = html`<div class="card">
            <div class="card-header">System Resources</div>
            <div class="card-body">
                <table class="table"><tbody>
                    <tr>
                        <td style="width:120px"><strong>CPU Load</strong></td>
                        <td>${(sysLoad.load1 || 0).toFixed(2)} / ${(sysLoad.load5 || 0).toFixed(2)} / ${(sysLoad.load15 || 0).toFixed(2)}</td>
                        <td class="text-right text-muted" style="width:100px">1m / 5m / 15m</td>
                    </tr>
                    <tr>
                        <td><strong>Memory</strong></td>
                        <td><${Badge} text=${Math.round(memPct) + '%'} variant=${memVariant} />
                            ${fmtBytes(sysMem.used || 0)} / ${fmtBytes(sysMem.total || 0)}</td>
                        <td class="text-right text-muted">used / total</td>
                    </tr>
                    <tr>
                        <td><strong>Swap</strong></td>
                        <td>${sysSwap.total > 0
                            ? html`<${Badge} text=${Math.round(swapPct) + '%'} variant=${swapVariant} />
                                ${fmtBytes(sysSwap.used || 0)} / ${fmtBytes(sysSwap.total)}`
                            : html`<span class="text-muted">Disabled</span>`}</td>
                        <td class="text-right text-muted">used / total</td>
                    </tr>
                </tbody></table>
            </div>
        </div>`;

        // ── Interface table ──
        const ifaceRows = ifaces.map(i => html`<tr key=${i.name}>
            <td><strong>${i.name}</strong></td>
            <td class="text-sm text-muted">${i.mac || '—'}</td>
            <td class="text-sm">${i.ips.join(', ') || '—'}</td>
            <td>${i.zone !== '—' ? html`<${Badge} text=${i.zone} variant="info" />` : html`<span class="text-muted">—</span>`}</td>
            <td><${ServiceStatus} state=${i.isUp ? 'up' : 'down'} label="" /></td>
            <td class="text-sm">${fmtBytes(i.rx)}</td>
            <td class="text-sm">${fmtBytes(i.tx)}</td>
        </tr>`);
        const interfacesCard = html`<div class="card">
            <div class="card-header">Network Interfaces</div>
            <div class="card-body">
                <${Table}
                    columns=${['Name', 'MAC', 'IP Addresses', 'Zone', 'State', 'RX', 'TX']}
                    rows=${ifaceRows} emptyText="No interfaces found" />
            </div>
        </div>`;

        // ── DHCP leases ──
        const leaseRows = dnsmasqLeases.slice(0, 10).map(l => html`<tr key=${l.mac + l.ip}>
            <td class="text-sm">${l.ip}</td>
            <td class="text-sm text-muted">${l.mac}</td>
            <td class="text-sm">${l.hostname || '—'}</td>
            <td class="text-sm text-muted">${l.interface || '—'}</td>
        </tr>`);
        const dhcpCard = html`<div class="card">
            <div class="card-header">Active DHCP Leases (${activeLeaseCount})</div>
            <div class="card-body">
                <${Table}
                    columns=${['IP', 'MAC', 'Hostname', 'Interface']}
                    rows=${leaseRows} emptyText="No active leases" />
                ${dnsmasqLeases.length > 10 ? html`<p class="text-muted text-sm">Showing 10 of ${dnsmasqLeases.length}.</p>` : ''}
            </div>
        </div>`;

        // ── Proxy domains ──
        const proxyCard = html`<div class="card">
            <div class="card-header">Proxy Domains</div>
            <div class="card-body">
                <div style="display:flex;gap:16px;margin-bottom:8px">
                    <${Badge} text=${onlineDomains} variant="success" /> Online
                    <${Badge} text=${offlineDomains} variant=${offlineDomains > 0 ? 'danger' : 'info'} /> Offline
                </div>
                ${proxyDomains.slice(0, 3).map(d => html`<div class="text-sm">
                    <strong>${d.domain}</strong> → ${d.backend_name || '—'}
                    <span class="text-muted">${d.path || '/'}</span>
                </div>`)}
                ${proxyDomains.length === 0 ? html`<span class="text-muted text-sm">No proxy domains configured.</span>` : ''}
            </div>
        </div>`;

        // ── Services ──
        const upCount = ifaces.filter(i => i.isUp).length;
        const services = html`<div class="card">
            <div class="card-header">Services</div>
            <div class="card-body">
                <ul class="service-list">
                    <li><${ServiceStatus} state=${dnsmasqStatus.service_active ? 'up' : 'down'} label="Dnsmasq" /></li>
                    <li><${ServiceStatus} state=${wgStatus.up ? 'up' : 'down'} label="WireGuard" />
                        <span class="text-muted text-sm">${wgp.length} peers</span></li>
                    <li><${ServiceStatus} state=${upCount > 0 ? 'up' : 'down'} label="Network" />
                        <span class="text-muted text-sm">${upCount}/${ifaces.length} interfaces online</span></li>
                </ul>
            </div>
        </div>`;

        // ── Side-by-side layout ──
        const dualCards = html`<div class="grid grid-2">
            ${dhcpCard}
            ${proxyCard}
        </div>`;

        return [
            PageHeader({ title: 'Dashboard', subtitle: 'System overview' }),
            stats,
            pendingCard,
            systemCard,
            interfacesCard,
            dualCards,
            services,
        ];
    },
});