// ── Oumta Dashboard plugin ──
//
// Fullscreen view that consumes the Oumta Go backend (`oumta-dashboard`).
// All reads go through `api()` below; configure the backend URL in the
// hyprcrd settings overlay (oumta tab) or accept the localhost default.

const h = window.hyprcrd;
const $ = id => document.getElementById(id);

// ── Settings / persisted state ──
//
// We use localStorage for now. Later we might persist via a hyprcrd setting
// or a plugin-level table — see TODO.md.

const LS_KEY = 'oumta-dashboard-settings';
const state = {
    settings: {
        baseUrl: 'http://localhost:8080', // e.g. https://dashboard.oumta.internal; default fits local dev
        authToken: '',          // Keycloak bearer; empty = no auth yet
        pollIntervalSec: 15,
    },
    namespaces: [],             // [{ id, label, namespace }]
    activeNamespace: null,
    activeView: 'overview',
    liveMode: 'polling',        // 'live' | 'polling' | 'error' | 'off'
    pollHandle: null,
    sseHandle: null,
    data: { overview: null, workloads: [], timeline: [], scopeWorkload: null },
};

function loadSettings() {
    try {
        const raw = localStorage.getItem(LS_KEY);
        if (raw) Object.assign(state.settings, JSON.parse(raw));
    } catch {}
}
function saveSettings() {
    localStorage.setItem(LS_KEY, JSON.stringify(state.settings));
}

// ── Central API surface ─────────────────────────────────────────
//
// Every backend call routes through `api()`. Requests go against
// `state.settings.baseUrl`; the active namespace (if any) is attached
// as a `namespace` query parameter, and the configured auth token is
// sent as a bearer header. Response shapes are defined by the Go
// backend in `internal/httpapi/contracts.go`.

async function api(path, opts = {}) {
    const url = new URL(path, state.settings.baseUrl);
    if (!url.searchParams.has('namespace') && state.activeNamespace) {
        url.searchParams.set('namespace', state.activeNamespace.namespace);
    }
    const headers = state.settings.authToken
        ? { Authorization: 'Bearer ' + state.settings.authToken }
        : {};
    const res = await fetch(url, { ...opts, headers });
    if (!res.ok) throw new Error(`${res.status}: ${await res.text()}`);
    return res.json();
}

// ── Fullscreen overlay show/hide ─────────────────────────────────

const overlay = $('oumta-overlay');

function isOpen() {
    return overlay?.classList.contains('open');
}
function show() {
    if (!overlay) return;
    overlay.classList.add('open');
    if (!state.namespaces.length) bootstrap();
    else {
        refresh();
        startLive();
    }
}
function hide() {
    if (!overlay) return;
    overlay.classList.remove('open');
    stopLive();
}
function toggle() {
    isOpen() ? hide() : show();
}
window._oumtaToggle = toggle;

// ── Bootstrap: load namespaces, then first refresh ─────────────

async function bootstrap() {
    try {
        const res = await api('/api/namespaces');
        state.namespaces = res.items || [];
        state.activeNamespace = state.namespaces[0] || null;
        renderNamespaceTabs();
        await refresh();
        startLive();
    } catch (e) {
        setLive('error', e.message);
    }
}

function renderNamespaceTabs() {
    const host = $('oumta-ns-tabs');
    if (!host) return;
    host.innerHTML = state.namespaces.map(n => `
        <button class="oumta-ns-tab ${state.activeNamespace?.id === n.id ? 'active' : ''}" data-ns="${n.id}">
            ${n.label}
        </button>
    `).join('');
    host.querySelectorAll('.oumta-ns-tab').forEach(btn => {
        btn.addEventListener('click', () => {
            const ns = state.namespaces.find(x => x.id === btn.dataset.ns);
            if (ns && ns.id !== state.activeNamespace?.id) {
                state.activeNamespace = ns;
                renderNamespaceTabs();
                refresh();
            }
        });
    });
}

// ── View switching ────────────────────────────────────────────

document.addEventListener('click', e => {
    const tab = e.target.closest('.oumta-view-tab');
    if (!tab || !overlay.contains(tab)) return;
    switchView(tab.dataset.view);
});

function switchView(view) {
    state.activeView = view;
    document.querySelectorAll('.oumta-view-tab').forEach(b =>
        b.classList.toggle('active', b.dataset.view === view));
    document.querySelectorAll('.oumta-view').forEach(s =>
        s.classList.toggle('hidden', s.dataset.view !== view));
    // Reset workload-scoped timeline when leaving timeline view
    if (view !== 'timeline') state.data.scopeWorkload = null;
    renderTimeline();
}

// ── Refresh all data for the active namespace ──────────────────

async function refresh() {
    if (!state.activeNamespace) return;
    try {
        const [ov, wl, tl] = await Promise.all([
            api('/api/cluster/overview'),
            api('/api/workloads'),
            api('/api/timeline'),
        ]);
        state.data.overview  = ov;
        state.data.workloads = wl.items || [];
        state.data.timeline  = tl.items || [];
        renderAll();
    } catch (e) {
        setLive('error', e.message);
    }
}

// ── Renderers ─────────────────────────────────────────────────

function renderAll() {
    renderOverview();
    renderWorkloads();
    renderTimeline();
    const genAt = state.data.overview?.updatedAtUtc;
    const el = $('oumta-generated-at');
    if (el && genAt) el.textContent = 'last import: ' + formatTime(genAt);
}

function renderOverview() {
    const o = state.data.overview;
    const wl = state.data.workloads || [];
    if (!o) return;

    // Values that come directly from the Go overview endpoint [REAL].
    const clusterCard = $('oumta-cluster-card');
    const clusterState = o.clusterState || 'unknown';
    clusterCard.dataset.state = clusterState;
    clusterCard.classList.toggle('oumta-fail', clusterState === 'down');
    $('oumta-cluster-state').textContent  = clusterState;
    $('oumta-cluster-updated').textContent = o.updatedAtUtc ? 'as of ' + formatTime(o.updatedAtUtc) : 'no data';
    $('oumta-workloads-up').textContent    = o.workloadsUp   ?? '—';
    $('oumta-workloads-down').textContent  = o.workloadsDown ?? '—';
    $('oumta-last-import').textContent     = o.updatedAtUtc ? formatTime(o.updatedAtUtc) : '—';

    // Any workload down → the "workloads down" tile becomes an alarm tile.
    const downCard = $('oumta-workloads-down').closest('.oumta-card');
    if (downCard) downCard.classList.toggle('oumta-fail', (o.workloadsDown ?? 0) > 0);

    // Values derived client-side from the workloads list — the overview
    // endpoint doesn't carry these today. If the backend later adds
    // `incidents` / `attention` fields, prefer those over the derivation.
    const attention = wl.filter(w => w.state !== 'healthy')
        .sort((a, b) => rankState(a.state) - rankState(b.state));
    $('oumta-incidents').textContent = attention.length || '—';
    const incCard = $('oumta-incidents').closest('.oumta-card');
    if (incCard) incCard.classList.toggle('oumta-fail', attention.length > 0);

    const list = $('oumta-attention-list');
    if (!attention.length) {
        list.innerHTML = '<div class="oumta-empty">Nothing currently flagged.</div>';
        return;
    }
    list.innerHTML = attention.map(a => `
        <div class="oumta-attention-row" data-wlid="${escapeAttr(a.workloadId)}">
            <span class="oumta-attention-state" data-state="${a.state}">${a.state}</span>
            <span class="oumta-attention-name">${escapeHtml(a.name)}</span>
            <span class="oumta-attention-ns">${escapeHtml(a.namespace)}</span>
            <span class="oumta-attention-reason">${escapeHtml(a.lastReason || '')}</span>
        </div>
    `).join('');
    list.querySelectorAll('.oumta-attention-row').forEach(row => {
        row.addEventListener('click', () => openWorkload(row.dataset.wlid));
    });
}

// Severity order for the attention list: worst first.
function rankState(s) {
    return { unavailable: 0, degraded: 1, healthy: 2 }[s] ?? 9;
}

function renderWorkloads() {
    const search = ($('oumta-wl-search').value || '').toLowerCase();
    const filterState = $('oumta-wl-status').value;
    const body = $('oumta-wl-body');
    const rows = (state.data.workloads || []).filter(w => {
        if (search && !w.name.toLowerCase().includes(search)) return false;
        if (filterState && w.state !== filterState) return false;
        return true;
    });
    if (!rows.length) {
        body.innerHTML = '<tr><td colspan="8" class="oumta-empty">No workloads match.</td></tr>';
        return;
    }
    body.innerHTML = rows.map(w => `
        <tr data-wlid="${escapeAttr(w.workloadId)}">
            <td>${escapeHtml(w.name)}</td>
            <td>${escapeHtml(w.namespace)}</td>
            <td class="wl-state-${w.state}">${w.state}</td>
            <td>${w.replicasReady}/${w.replicasDesired}</td>
            <td>${escapeHtml(w.cpu)}</td>
            <td>${escapeHtml(w.memory)}</td>
            <td>${escapeHtml(w.image)}</td>
            <td>${escapeHtml(w.lastReason)}</td>
        </tr>
    `).join('');
    body.querySelectorAll('tr').forEach(tr => {
        tr.addEventListener('click', () => openWorkload(tr.dataset.wlid));
    });
}

function renderTimeline() {
    const scope = state.data.scopeWorkload;
    const scopeEl = $('oumta-timeline-scope');
    const backEl = $('oumta-timeline-back');
    if (scope) {
        scopeEl.textContent = 'events for ' + scope;
        backEl.classList.remove('hidden');
    } else {
        scopeEl.textContent = 'all events';
        backEl.classList.add('hidden');
    }
    const events = scope
        ? (state.data.timeline.filter(e => e.workloadId === scope))
        : state.data.timeline;
    const body = $('oumta-timeline-body');
    if (!events.length) {
        body.innerHTML = '<div class="oumta-empty">No events.</div>';
        return;
    }
    body.innerHTML = events.map(e => {
        // Recovery = letzter State-Uebergang endet in "-> healthy".
        // Image-Rollout = vom Backend markiert via reason "ImageRolled".
        // Beide kriegen eigene Badges, damit man Erholungen und neue
        // Images von generischen Info-Events (nur-Revision-Rollouts)
        // trennen kann.
        const isRecovery = typeof e.message === 'string' && e.message.endsWith('-> healthy');
        const isImageRoll = e.reason === 'ImageRolled';
        let sev = e.severity;
        if (isRecovery) sev = 'recovered';
        else if (isImageRoll) sev = 'image';
        return `
            <div class="oumta-timeline-entry">
                <div class="oumta-timeline-time">${formatTime(e.timestamp)}</div>
                <div class="oumta-timeline-severity" data-sev="${sev}">${sev}</div>
                <div>
                    <div class="oumta-timeline-message">${escapeHtml(e.message)}</div>
                    <div class="oumta-timeline-meta">${escapeHtml(e.workloadId)} · ${escapeHtml(e.reason || '')}</div>
                </div>
            </div>
        `;
    }).join('');
}

// ── Workload → detail-as-timeline navigation ──────────────────

async function openWorkload(workloadId) {
    state.data.scopeWorkload = workloadId;
    const [nsSlug, name] = workloadId.replace('deployment/', '').split('/');
    // Pull workload-scoped timeline — this REPLACES the generic one for rendering.
    try {
        const res = await api(`/api/workloads/${nsSlug}/${name}/timeline`);
        state.data.timeline = res.items || [];
    } catch (e) { setLive('error', e.message); }
    switchView('timeline');
}

$('oumta-timeline-back')?.addEventListener('click', () => {
    state.data.scopeWorkload = null;
    // Restore the global timeline
    api('/api/timeline').then(r => {
        state.data.timeline = r.items || [];
        renderTimeline();
    }).catch(e => setLive('error', e.message));
});

// ── Realtime (SSE) with polling fallback ──────────────────────
//
// Plan: open an EventSource at <baseUrl>/api/events?namespace=… — backend
// not implemented yet, so we go straight to polling. When SSE is available
// we can try to connect and fall back on `error`.

function startLive() {
    stopLive();
    // TODO(api): attempt SSE first:
    //   state.sseHandle = new EventSource(url);
    //   state.sseHandle.onmessage = ev => applyLiveEvent(JSON.parse(ev.data));
    //   state.sseHandle.onerror = () => { stopLive(); startPolling(); setLive('polling'); };
    //   state.sseHandle.onopen  = () => setLive('live');
    startPolling();
}
function stopLive() {
    if (state.pollHandle) { clearInterval(state.pollHandle); state.pollHandle = null; }
    if (state.sseHandle)  { state.sseHandle.close(); state.sseHandle = null; }
    setLive('off');
}
function startPolling() {
    const ms = (state.settings.pollIntervalSec || 15) * 1000;
    state.pollHandle = setInterval(refresh, ms);
    setLive('polling');
}

function setLive(mode, detail = '') {
    state.liveMode = mode;
    const el = $('oumta-live-indicator');
    const lbl = $('oumta-live-label');
    if (el) el.dataset.state = mode;
    if (lbl) {
        lbl.textContent = ({
            live: 'live',
            polling: 'polling',
            error: 'error' + (detail ? ' — ' + detail : ''),
            off: 'off',
        })[mode] || mode;
    }
}

// ── Header buttons ───────────────────────────────────────────

$('oumta-close')?.addEventListener('click', hide);
$('oumta-refresh')?.addEventListener('click', refresh);
$('oumta-wl-search')?.addEventListener('input', renderWorkloads);
$('oumta-wl-status')?.addEventListener('change', renderWorkloads);
$('oumta-wl-timerange')?.addEventListener('change', () => {
    // TODO(api): forward to /api/workloads?since=<ISO> once the backend accepts it.
    renderWorkloads();
});

// ESC to close
window.addEventListener('keydown', e => {
    if (e.key === 'Escape' && isOpen()) {
        e.preventDefault(); e.stopPropagation();
        hide();
    }
}, { capture: true });

// ── Inject header button into hyprcrd top bar ────────────────

function injectHeaderButton() {
    const tasksBtn = document.getElementById('tasks-btn');
    if (!tasksBtn || document.getElementById('oumta-btn')) return;
    const btn = document.createElement('button');
    btn.id = 'oumta-btn';
    btn.className = 'flex items-center gap-2 px-2.5 py-1.5 text-xs border border-t-border text-t-muted hover:border-t-accent hover:text-t-accent transition-colors';
    btn.innerHTML = '<i class="ph ph-gauge text-sm"></i><span class="font-pixel text-[10px]">Oumta</span>';
    btn.addEventListener('click', toggle);
    tasksBtn.parentNode.insertBefore(btn, tasksBtn);
}
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', injectHeaderButton);
} else {
    injectHeaderButton();
}

// ── Settings tab in hyprcrd settings ─────────────────────────

function renderSettingsPanel(panelEl) {
    panelEl.innerHTML = `
        <div class="oumta-settings-field">
            <label for="oumta-set-baseurl">API Base URL</label>
            <input type="text" id="oumta-set-baseurl" placeholder="http://localhost:8080">
            <div class="oumta-settings-help">Where the Oumta Go backend is reachable from this browser. No trailing slash.</div>
        </div>
        <div class="oumta-settings-field">
            <label for="oumta-set-token">Auth token (optional)</label>
            <input type="text" id="oumta-set-token" placeholder="Bearer token from Keycloak">
            <div class="oumta-settings-help">Will be sent as <code>Authorization: Bearer &lt;token&gt;</code>. Leave empty if the API is unauthenticated.</div>
        </div>
        <div class="oumta-settings-field">
            <label for="oumta-set-poll">Poll interval (seconds)</label>
            <input type="number" id="oumta-set-poll" min="5" max="300">
            <div class="oumta-settings-help">Used as a fallback when SSE is unavailable.</div>
        </div>
        <button id="oumta-set-save" class="flex items-center gap-1.5 px-3 py-1.5 text-xs border border-t-accent text-t-accent hover:bg-t-accent hover:text-t-bg transition-colors">
            <i class="ph ph-floppy-disk text-sm"></i><span class="font-pixel text-[10px]">Save</span>
        </button>
        <span id="oumta-set-status" class="font-pixel text-[10px] text-t-dim ml-3"></span>
    `;
    $('oumta-set-baseurl').value = state.settings.baseUrl || '';
    $('oumta-set-token').value   = state.settings.authToken || '';
    $('oumta-set-poll').value    = state.settings.pollIntervalSec || 15;
    $('oumta-set-save').addEventListener('click', () => {
        state.settings.baseUrl         = $('oumta-set-baseurl').value.trim();
        state.settings.authToken       = $('oumta-set-token').value.trim();
        state.settings.pollIntervalSec = Math.max(5, parseInt($('oumta-set-poll').value) || 15);
        saveSettings();
        const s = $('oumta-set-status');
        s.textContent = 'saved';
        setTimeout(() => { s.textContent = ''; }, 1500);
        // If the overlay is open, restart polling with new interval.
        if (isOpen()) { stopLive(); startLive(); }
    });
}

// ── Helpers ─────────────────────────────────────────────────

function escapeHtml(s) {
    return String(s ?? '').replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));
}
function escapeAttr(s) { return escapeHtml(s); }
function formatTime(iso) {
    try {
        const d = new Date(iso);
        return d.toLocaleString();
    } catch { return iso; }
}

// ── Boot ────────────────────────────────────────────────────

loadSettings();
h?.settings?.registerTab?.({
    id: 'oumta-dashboard',
    label: 'oumta',
    icon: 'ph-gauge',
    onShow: renderSettingsPanel,
});
h?.registerPlugin?.({ name: 'oumta-dashboard', version: '0.1.0' });