import { h, PageHeader, Tabs, esc, definePage, refactorLoad } from '/static/hoover/index.js?v=6';

const logTabs = [
    { key: 'journal', label: 'Journal', url: '/api/logs/journal' },
    { key: 'nginx-access', label: 'Nginx Access', url: '/api/logs/nginx/access' },
    { key: 'nginx-error', label: 'Nginx Error', url: '/api/logs/nginx/error' },
    { key: 'dnsmasq', label: 'Dnsmasq', url: '/api/logs/dnsmasq' },
    { key: 'app', label: 'App', url: '/api/logs/app' },
];

async function fetchLog(state, url, signal) {
    if (signal?.aborted) return;
    const res = await fetch(url, { signal });
    if (signal?.aborted) return;
    if (!res.ok) throw new Error(`HTTP ${res.status}`);
    const text = await res.text();
    if (signal?.aborted) return;
    state.lines = text.split('\n').filter(l => l.length > 0);
}

export default definePage({
    init() {
        return { activeTab: 'journal', lines: [], loading: false, _abortCtrl: null };
    },
    subscribe: [],
    async load(state, abortController, entry) {
        await refactorLoad(state,
            s => s.lines?.length,
            async (s, sig, isAborted) => {
                const tab = logTabs.find(t => t.key === s.activeTab) || logTabs[0];
                await fetchLog(s, tab.url, sig);
            },
            { entry, abortController },
        );
    },
    onUnmount(state) {
        state._abortCtrl?.abort();
        state.lines = [];
    },
    render(state) {
        const tab = logTabs.find(t => t.key === state.activeTab) || logTabs[0];

        const lineVnodes = state.lines.map((line, i) =>
            h('div', { class: 'log-line', key: i }, esc(line))
        );

        return [
            PageHeader({ title: 'Logs', subtitle: 'System & service logs' }),
            Tabs({
                state,
                tabs: logTabs.map(t => t.key),
                formatLabel: (k) => {
                    const tab = logTabs.find(t => t.key === k);
                    return tab ? tab.label : k.charAt(0).toUpperCase() + k.slice(1);
                },
                onTabClick: async (key) => {
                    const tab = logTabs.find(t => t.key === key);
                    if (!tab) return;
                    state._abortCtrl?.abort();
                    const ctrl = new AbortController();
                    state._abortCtrl = ctrl;
                    const tabs = state.lines?.length ? state : null;
                    state.refreshing = !!tabs;
                    if (!tabs) state.loading = true;
                    state.error = null;
                    try {
                        await fetchLog(state, tab.url, ctrl.signal);
                    } catch (e) {
                        if (!ctrl.signal.aborted) state.error = String(e);
                    }
                    state.loading = false;
                    state.refreshing = false;
                },
            }),
            h('div', { class: 'card', key: 'log-card' },
                h('div', { class: 'card-header' },
                    h('span', null, tab.label),
                    h('button', {
                        class: 'btn btn-sm btn-outline',
                        style: 'float:right;',
                        'on:click': async () => {
                            state._abortCtrl?.abort();
                            const ctrl = new AbortController();
                            state._abortCtrl = ctrl;
                            state.refreshing = true;
                            state.error = null;
                            try {
                                await fetchLog(state, tab.url, ctrl.signal);
                            } catch (e) {
                                if (!ctrl.signal.aborted) state.error = String(e);
                            }
                            state.loading = false;
                            state.refreshing = false;
                        },
                    }, '\u21BB')
                ),
                h('div', { class: 'card-body log-body' },
                    state.loading && !state.refreshing
                        ? h('div', { class: 'loading' }, state.refreshing ? 'Refreshing...' : 'Loading...')
                        : state.error
                            ? h('div', { class: 'error-msg' }, state.error)
                            : lineVnodes.length > 0
                                ? h('pre', null, lineVnodes)
                                : h('div', { class: 'text-muted text-sm' }, 'No log lines available')
                )
            ),
        ];
    },
});