import { html, h, PageHeader, ConfirmDelete, Tabs, Table, ServiceStatus, renderGuardMulti, esc, enc, $val, apiFetch, toast, definePage, getModel, modelFetch, ActionButton, ActionGroup, QuickModal } from '/static/hoover/index.js';

function makeAddRange(activeZones, interfaces) {
    const opts = [
        ['', '(global)'],
        ...Object.entries(activeZones || {})
            .filter(([, ifaces]) => Array.isArray(ifaces) && ifaces.length > 0)
            .flatMap(([zone, ifaces]) => {
                const label = zone + ' \u2192 ';
                if (ifaces.length === 1)
                    return [[ifaces[0], label + ifaces[0]]];
                return [{ group: zone, options: ifaces.map(i => [i, label + i]) }];
            }),
    ];

    const ranges = {};
    (interfaces || []).forEach(iface => {
        for (const cidr of (iface.ips || [])) {
            if (cidr.indexOf('/') === -1) continue;
            const parts = cidr.split('/');
            const addr = parts[0].split('.').map(Number);
            const prefix = parseInt(parts[1], 10);
            if (prefix > 30 || prefix < 8) continue;
            const mask = (0xFFFFFFFF << (32 - prefix)) >>> 0;
            const netA = ((addr[0] << 24) + (addr[1] << 16) + (addr[2] << 8) + addr[3]) & mask;
            const broadcast = (netA | (~mask >>> 0)) >>> 0;
            const s = (netA + 100) >>> 0;
            const e = Math.min((netA + 200) >>> 0, broadcast - 1);
            const toIp = (n) => [n >> 24 & 0xFF, n >> 16 & 0xFF, n >> 8 & 0xFF, n & 0xFF].join('.');
            if (s <= e) {
                ranges[iface.name] = { start: toIp(s), end: toIp(e) };
            }
            break;
        }
    });

    return QuickModal({
        title: 'Add DHCP Range',
        fields: [
            { label: 'Interface (optional)', id: 'r-iface', tag: 'select', options: opts },
            { label: 'Start IP', id: 'r-start', placeholder: '192.168.1.100' },
            { label: 'End IP', id: 'r-end', placeholder: '192.168.1.200' },
            { label: 'Lease Time', id: 'r-lease', placeholder: '12h' },
        ],
        postRender: (inner) => {
            const select = inner.querySelector('#r-iface');
            const startInput = inner.querySelector('#r-start');
            const endInput = inner.querySelector('#r-end');
            if (select && startInput && endInput) {
                select.addEventListener('change', () => {
                    const r = ranges[select.value];
                    if (r) {
                        startInput.value = r.start;
                        endInput.value = r.end;
                    } else {
                        startInput.value = '';
                        endInput.value = '';
                    }
                });
            }
        },
        submit: {
            url: '/api/dhcp/ranges',
            body: () => ({
                interface: ($val('r-iface') || '').trim() || undefined,
                start: ($val('r-start') || '').trim(),
                end: ($val('r-end') || '').trim(),
                lease_time: ($val('r-lease') || '').trim() || '12h',
            }),
            validate: (b) => !b.start || !b.end ? 'Start and end are required' : null,
            successMsg: 'Range added',
        },
        refresh: 'dnsmasq',
    });
}

const addLease = QuickModal({
    title: 'Add Static Lease',
    fields: [
        { label: 'MAC', id: 'l-mac', placeholder: 'aa:bb:cc:dd:ee:ff' },
        { label: 'IP', id: 'l-ip', placeholder: '192.168.1.50' },
        { label: 'Hostname (optional)', id: 'l-host', placeholder: 'device-name' },
    ],
    submit: {
        url: '/api/dhcp/static-lease',
        body: () => ({
            mac: ($val('l-mac') || '').trim(),
            ip: ($val('l-ip') || '').trim(),
            hostname: ($val('l-host') || '').trim() || undefined,
        }),
        validate: (b) => !b.mac || !b.ip ? 'MAC and IP are required' : null,
        successMsg: 'Lease added',
    },
    refresh: 'dnsmasq',
});

const addDns = QuickModal({
    title: 'Add DNS Record',
    fields: [
        { label: 'Name', id: 'd-name', placeholder: 'host.local' },
        { label: 'Address', id: 'd-addr', placeholder: '192.168.1.10' },
    ],
    submit: {
        url: '/api/dhcp/dns-record',
        body: () => ({ name: ($val('d-name') || '').trim(), address: ($val('d-addr') || '').trim() }),
        validate: (b) => !b.name || !b.address ? 'Name and address are required' : null,
        successMsg: 'DNS record added',
    },
    refresh: 'dnsmasq',
});

export default definePage({
    init() {
        return {
            dnsmasq: getModel('dnsmasq'),
            firewall: getModel('firewall'),
            activeTab: 'ranges',
        };
    },
    render(state) {
        const guard = renderGuardMulti('DHCP & DNS', 'Dnsmasq management', state.dnsmasq, state.firewall);
        if (guard) return guard;

        const cfg = state.dnsmasq.data?.config || {};
        const dhcpCfg = cfg.dhcp || {};
        const dnsCfg = cfg.dns || {};
        const ranges = dhcpCfg.ranges || [];
        const staticLeases = dhcpCfg.static_leases || [];
        const dnsRecords = dnsCfg.custom_records || [];
        const status = state.dnsmasq.data?.status || {};

        const rangesRows = ranges.map((r) => html`<tr key=${(r.interface || '_g') + '-' + r.start + '-' + r.end}>
            <td>${r.interface || '(global)'}</td>
            <td>${esc(r.start)}</td>
            <td>${esc(r.end)}</td>
            <td>${esc(r.lease_time || '12h')}</td>
            <td>
                <${ConfirmDelete}
                    url="/api/dhcp/ranges"
                    deleteKey=${(r.interface || '_g') + '-' + r.start + '-' + r.end}
                    message=${'Remove range ' + r.start + ' - ' + r.end + '?'}
                    body=${{ interface: r.interface || '', start: r.start, end: r.end }}
                    success="Range removed"
                    refresh="dnsmasq" />
            </td>
        </tr>`);

        const leaseRows = staticLeases.map((l) => html`<tr key=${l.mac}>
            <td>${esc(l.mac)}</td>
            <td>${esc(l.ip)}</td>
            <td>${l.hostname || '-'}</td>
            <td>
                <${ConfirmDelete}
                    url=${'/api/dhcp/static-lease/' + enc(l.mac)}
                    deleteKey=${l.mac}
                    message=${'Remove lease ' + l.mac + '?'}
                    success="Lease removed"
                    refresh="dnsmasq" />
            </td>
        </tr>`);

        const dnsRows = dnsRecords.map((rec) => html`<tr key=${rec.name}>
            <td><strong>${esc(rec.name || 'unnamed')}</strong></td>
            <td class="text-sm">${esc(rec.address || '-')}</td>
            <td>
                <${ConfirmDelete}
                    url=${'/api/dhcp/dns-record/' + enc(rec.name || '')}
                    deleteKey=${rec.name || 'unnamed'}
                    message=${'Remove DNS record ' + (rec.name || 'unnamed') + '?'}
                    success="Record removed"
                    refresh="dnsmasq" />
            </td>
        </tr>`);

        const _setDomain = async (domain) => {
            const res = await apiFetch('/api/dhcp/domain', {
                method: 'POST',
                body: { domain },
            });
            if (res.ok) {
                toast('DNS domain updated', 'success');
                modelFetch('dnsmasq');
            } else {
                toast(res.error || 'Failed to update', 'error');
            }
        };

        const currentDomain = dnsCfg.domain || null;
        const domainSection = html`<div class="domain-config" style="margin-bottom: 1rem;">
            <label style="font-weight: 600;">Search Domain</label>
            <p class="text-sm" style="margin: 0.25rem 0 0.5rem;">${currentDomain ? esc(currentDomain) : '<span class="text-muted">(not set)</span>'}</p>
            <div class="form-inline" style="display: flex; gap: 0.5rem; align-items: center;">
                <input id="domain-input" class="input" placeholder="example.local" />
                <button class="btn btn-outline" onClick=${() => _setDomain(($val('domain-input') || '').trim())}>Set</button>
                <button class="btn btn-outline" onClick=${() => _setDomain(null)}>Clear</button>
            </div>
        </div>`;

        const tabNames = ['ranges', 'leases', 'dns', 'active'];
        const actions = ActionGroup(
            html`<button class="btn btn-primary" onClick=${() => makeAddRange(state.firewall.data?.zones?.active, state.firewall.data?.interfaces)(state)}>Add Range</button>`,
            html`<button class="btn btn-outline" onClick=${() => addLease(state)}>Static Lease</button>`,
            html`<button class="btn btn-outline" onClick=${() => addDns(state)}>DNS Record</button>`,
            (() => {
                const pending = status.pending_changes === true;
                return h('button', {
                    class: pending ? 'btn btn-primary btn-apply-pending' : 'btn btn-outline',
                    disabled: !pending,
                    'on:click': async () => {
                        const res = await apiFetch('/api/dhcp/apply', { method: 'POST' });
                        if (res.ok) {
                            const synced = res.data?.synced;
                            let msg = 'dnsmasq applied';
                            if (synced && synced.length) {
                                msg += ' (auto-synced: ' + synced.join(', ') + ')';
                                synced.forEach(s => modelFetch(s));
                            }
                            toast(msg, 'success');
                            modelFetch('dnsmasq');
                        } else {
                            toast(res.error || 'Apply failed', 'error');
                        }
                    },
                }, pending ? 'Apply' : 'Synced');
            })(),
        );

        const leaseTable = state.activeTab === 'active'
            ? Table({
                columns: ['MAC', 'IP', 'Hostname', 'Expires'],
                rows: (state.dnsmasq.data?.leases || []).map((l) => html`<tr key=${l.mac || l.ip}>
                    <td>${esc(l.mac || '-')}</td>
                    <td>${esc(l.ip || '-')}</td>
                    <td>${esc(l.hostname || '-')}</td>
                    <td>${esc(l.expires || '-')}</td>
                </tr>`),
                emptyText: 'No active leases',
            }) : null;

        return [
            PageHeader({ title: 'DHCP & DNS', subtitle: 'Dnsmasq management', actions }),
            ServiceStatus({ state: status.service_active ? 'up' : 'down', label: 'Dnsmasq' }),
            Tabs({ state, tabs: tabNames }),
            state.activeTab === 'ranges'
                ? Table({ columns: ['Interface', 'Start', 'End', 'Lease', 'Action'], rows: rangesRows, emptyText: 'No DHCP ranges' }) : null,
            state.activeTab === 'leases'
                ? Table({ columns: ['MAC', 'IP', 'Hostname', 'Action'], rows: leaseRows, emptyText: 'No static leases' }) : null,
            state.activeTab === 'dns'
                ? [
                    domainSection,
                    Table({ columns: ['Name', 'Address', 'Action'], rows: dnsRows, emptyText: 'No custom DNS records' })
                ] : null,
            leaseTable,
        ];
    },
});