import { h, PageHeader, Badge, StatusDot, Empty, Table, ServiceStatus, renderGuard, esc, enc, $val, apiFetch, toast, openModal, closeModal, formModal, definePage, getModel, modelFetch, ActionButton, ActionCell, MonoText, ActionGroup, QuickModal, downloadBlob } from '/static/hoover/index.js?v=7';

const addPeer = QuickModal({
    title: 'Add WireGuard Peer',
    fields: [
        { label: 'Name', id: 'wg-name', placeholder: 'client-name' },
        { label: 'Endpoint (optional)', id: 'wg-endpoint', placeholder: '1.2.3.4:51820' },
        { label: 'Allowed IPs (optional)', id: 'wg-allowed', placeholder: '10.0.0.2/32' },
        { label: 'Persistent Keepalive (optional)', id: 'wg-keepalive', type: 'number', placeholder: '25' },
    ],
    submit: {
        url: '/api/wireguard/peers',
        body: () => ({
            name: ($val('wg-name') || '').trim(),
            endpoint: ($val('wg-endpoint') || '').trim() || undefined,
            allowed_ips: ($val('wg-allowed') || '').trim() ? [($val('wg-allowed') || '').trim()] : [],
            persistent_keepalive: $val('wg-keepalive') ? parseInt($val('wg-keepalive')) : undefined,
        }),
        validate: (b) => !b.name ? 'Name is required' : null,
        successMsg: 'Peer added',
    },
    refresh: 'wireguard',
});

function downloadConfigModal(peerName, config, state) {
    openModal((inner, idx) => {
        formModal(inner, 'Download Config for ' + peerName,
            [{ label: 'Server Endpoint', id: 'wg-srv-endpoint', placeholder: 'vpn.example.com:51820' }],
            [
                { label: 'Cancel', cls: 'btn-outline', action: 'c', handler: () => closeModal(idx) },
                {
                    label: 'Generate', cls: 'btn-primary', action: 's', handler: async () => {
                        const endpoint = ($val('wg-srv-endpoint') || '').trim();
                        if (!endpoint) { toast('Server endpoint is required', 'error'); return; }
                        const resp = await apiFetch('/api/wireguard/generate-client', {
                            method: 'POST',
                            body: { name: peerName, server_endpoint: endpoint },
                        });
                        if (resp.ok && resp.data?.config) {
                            downloadBlob(new Blob([resp.data.config], { type: 'text/plain' }), peerName + '.conf');
                            toast('Config downloaded', 'success');
                            closeModal(idx);
                        } else {
                            toast(resp.error || 'Failed', 'error');
                        }
                    },
                },
            ],
        );
    });
}

export default definePage({
    init() {
        return {
            wireguard: getModel('wireguard'),
        };
    },
    render(state) {
        const guard = renderGuard(state.wireguard, 'WireGuard', null, state.wireguard.data?.peers);
        if (guard) return guard;

        const st = state.wireguard.data?.status || {};
        const isUp = st.state === 'up';
        const listenPort = (state.wireguard.data?.config?.interface || {}).listen_port || '-';

        const peerRows = (state.wireguard.data?.peers || []).map(p => {
            const hasHandshake = !!p.latest_handshake;
            return h('tr', { key: p.name },
                h('td', null,
                    StatusDot({ status: hasHandshake ? 'success' : 'danger' }),
                    h('strong', null, esc(p.name || 'unnamed')),
                ),
                h('td', null, MonoText({ text: p.public_key || 'N/A', maxLength: 20 })),
                h('td', { class: 'text-sm' }, esc(p.allowed_ips || '-')),
                h('td', { class: 'text-sm' }, esc(p.endpoint || '-')),
                h('td', { class: 'text-sm' }, esc(p.latest_handshake || 'Never')),
                h('td', { class: 'text-sm' },
                    'Recv: ' + esc(p.transfer_recv || '0'),
                    h('br'),
                    'Sent: ' + esc(p.transfer_sent || '0'),
                ),
                ActionCell({
                    editLabel: 'Config',
                    editClick: () => downloadConfigModal(p.name, state.wireguard.data?.config, state),
                    removeUrl: '/api/wireguard/peers/' + enc(p.name),
                    removeMessage: 'Remove peer ' + p.name + '?',
                    removeSuccess: 'Peer removed',
                    removeRefresh: 'wireguard',
                }),
            );
        });

        const actions = ActionGroup(
            h('button', { class: 'btn btn-primary', 'on:click': () => addPeer(state) }, 'Add Peer'),
            ActionButton({
                url: '/api/wireguard/' + (isUp ? 'down' : 'up'),
                labelOn: 'Stop', labelOff: 'Start', condition: isUp,
                successMsg: 'Tunnel ' + (isUp ? 'stopped' : 'started'),
                refresh: 'wireguard',
            }),
            ActionButton({
                url: '/api/wireguard/apply',
                successMsg: 'Config applied',
                label: 'Apply',
                refresh: 'wireguard',
            }),
        );

        return [
            PageHeader({
                title: 'WireGuard',
                subtitle: 'Tunnel: ' + (st.state || 'unknown') + ', Listen: ' + listenPort,
                actions,
            }),
            ServiceStatus({ state: st.state || 'down' }),
            peerRows.length
                ? Table({
                    columns: ['Peer', 'Public Key', 'Allowed IPs', 'Endpoint', 'Handshake', 'Transfer', 'Actions'],
                    rows: peerRows,
                })
                : Empty({ text: 'No peers configured. Add a peer above.' }),
        ];
    },
});