// ── Oumta Dashboard plugin ──
//
// Fullscreen view that consumes the Oumta Go backend (`oumta-dashboard`).
// Backend location + poll interval are hardwired below — change them here
// if the deployment topology shifts. No UI settings panel on purpose:
// this plugin only makes sense in one specific deployment, so a settings
// tab would just be noise and tempt accidental misconfiguration.

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

const CONFIG = {
    baseUrl: 'http://localhost:8085',
    authToken: '',          // Keycloak bearer; empty = no auth yet
    pollIntervalSec: 15,
};

const state = {
    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 },
    timelineFilter: null,       // null = all events, else workloadId (pill quick-pick)
};

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

async function api(path, opts = {}) {
    const url = new URL(path, CONFIG.baseUrl);
    if (!url.searchParams.has('namespace') && state.activeNamespace) {
        url.searchParams.set('namespace', state.activeNamespace.namespace);
    }
    const headers = CONFIG.authToken
        ? { Authorization: 'Bearer ' + CONFIG.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));
    });
}

// ── Timeline helpers ──────────────────────────────────────────

const TL_CLUSTER_WINDOW_MS = 60_000;   // events within 60s collapse into one entry
const TL_SEV_RANK = { error: 5, warning: 4, recovered: 3, image: 2, info: 1 };
const TL_MONTHS = ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL', 'AUG', 'SEP', 'OCT', 'NOV', 'DEC'];

/** Normalise an event's severity. Two post-hoc classifications matter:
 *  "-> healthy" transitions are recoveries, and ImageRolled reasons are
 *  real image pushes (vs. plain revision bumps which are just info). */
function eventSev(e) {
    const isRecovery = typeof e.message === 'string' && e.message.endsWith('-> healthy');
    const isImageRoll = e.reason === 'ImageRolled';
    if (isRecovery) return 'recovered';
    if (isImageRoll) return 'image';
    return e.severity || 'info';
}

/** Workload short-name for the filter pill (strip namespace prefix). */
function workloadShort(id) {
    if (!id) return '?';
    const parts = id.split('/');
    return parts[parts.length - 1] || id;
}

/** Greedy clustering: walk events (assumed newest-first) and start a new
 *  cluster whenever the gap exceeds the tolerance window. */
function clusterEvents(events) {
    const clusters = [];
    let current = null;
    for (const e of events) {
        const ts = Date.parse(e.timestamp);
        if (!current || isNaN(ts) || Math.abs(current.anchorTs - ts) > TL_CLUSTER_WINDOW_MS) {
            current = { anchorTs: ts, ts: e.timestamp, events: [e] };
            clusters.push(current);
        } else {
            current.events.push(e);
        }
    }
    return clusters;
}

function dominantSev(events) {
    let best = null;
    for (const e of events) {
        const sev = eventSev(e);
        if (!best || TL_SEV_RANK[sev] > TL_SEV_RANK[best]) best = sev;
    }
    return best || 'info';
}

function sameDay(a, b) {
    const da = new Date(a), db = new Date(b);
    return da.getFullYear() === db.getFullYear()
        && da.getMonth() === db.getMonth()
        && da.getDate() === db.getDate();
}

function formatTimeShort(iso) {
    const d = new Date(iso);
    if (isNaN(d.getTime())) return iso;
    const now = new Date();
    if (Math.abs(now - d) < 60_000) return 'just now';
    const hh = String(d.getHours()).padStart(2, '0');
    const mm = String(d.getMinutes()).padStart(2, '0');
    return `${hh}:${mm}`;
}

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 = state.timelineFilter ? 'filtered' : 'all events';
        backEl.classList.add('hidden');
    }
    const filter = state.timelineFilter;
    const events = state.data.timeline.filter(e => {
        if (scope) return e.workloadId === scope;
        if (filter) return e.workloadId === filter;
        return true;
    });
    renderTimelineFilters();

    const body = $('oumta-timeline-body');
    if (!events.length) {
        body.innerHTML = '<div class="oumta-empty">No events.</div>';
        return;
    }
    const clusters = clusterEvents(events);

    let lastDate = null;
    body.innerHTML = clusters.map(cluster => {
        const sev = dominantSev(cluster.events);
        const showDate = !lastDate || !sameDay(lastDate, cluster.ts);
        lastDate = cluster.ts;
        const d = new Date(cluster.ts);
        const badge = showDate
            ? `<div class="oumta-tl-date" title="${escapeAttr(d.toDateString())}">
                   <span class="day">${d.getDate()}</span>
                   <span class="mon">${TL_MONTHS[d.getMonth()]}</span>
               </div>`
            : '';
        const left = `
            <div class="oumta-tl-left">
                ${badge}
                <div class="oumta-tl-dot" data-sev="${sev}"></div>
                <div class="oumta-tl-time">${escapeHtml(formatTimeShort(cluster.ts))}</div>
            </div>`;
        const right = `
            <div class="oumta-tl-right">
                ${cluster.events.map(e => {
                    const esev = eventSev(e);
                    const wid = e.workloadId || '';
                    return `
                        <div class="oumta-tl-event">
                            <div class="oumta-tl-event-head">
                                <span class="oumta-tl-severity" data-sev="${esev}">${esev}</span>
                                <span class="oumta-tl-workload" data-wlid="${escapeAttr(wid)}" title="filter by this workload">${escapeHtml(workloadShort(wid))}</span>
                                <span class="oumta-tl-reason">${escapeHtml(e.reason || '')}</span>
                            </div>
                            <div class="oumta-tl-message">${escapeHtml(e.message || '')}</div>
                        </div>
                    `;
                }).join('')}
            </div>`;
        return `<div class="oumta-timeline-entry">${left}${right}</div>`;
    }).join('');

    // Tapping a workload name inside an event filters the timeline to it.
    body.querySelectorAll('.oumta-tl-workload').forEach(el => {
        el.addEventListener('click', () => setTimelineFilter(el.dataset.wlid));
    });
}

function setTimelineFilter(workloadId) {
    state.timelineFilter = workloadId || null;
    renderTimeline();
}

/** Render the workload quick-pick bar. "all" + distinct workloads seen in
 *  the current timeline, capped at N inline pills — overflow collapses
 *  into a dropdown. Deduplicated by workloadId, ranked by most recent
 *  event so the pills you care about stay visible. */
function renderTimelineFilters() {
    const host = $('oumta-timeline-filters');
    if (!host) return;
    // In workload-detail scope (opened via a card click) the filter bar is
    // redundant — we're already showing one workload's events.
    if (state.data.scopeWorkload) { host.innerHTML = ''; return; }

    const seen = new Map();   // workloadId -> earliest-seen index (= recency)
    state.data.timeline.forEach((e, i) => {
        if (e.workloadId && !seen.has(e.workloadId)) seen.set(e.workloadId, i);
    });
    const workloads = [...seen.keys()];
    if (!workloads.length) { host.innerHTML = ''; return; }

    const INLINE_LIMIT = 6;
    const inline = workloads.slice(0, INLINE_LIMIT);
    const overflow = workloads.slice(INLINE_LIMIT);
    const active = state.timelineFilter;

    const pill = (id, label, isActive) =>
        `<button class="oumta-tl-pill${isActive ? ' active' : ''}" data-wlid="${escapeAttr(id)}">${escapeHtml(label)}</button>`;

    const overflowActive = overflow.includes(active);
    host.innerHTML = [
        pill('', 'all', !active),
        ...inline.map(id => pill(id, workloadShort(id), id === active)),
        overflow.length ? `
            <div class="oumta-tl-more">
                <button class="oumta-tl-pill${overflowActive ? ' active' : ''}" data-tl-more="1">+${overflow.length} more<i class="ph ph-caret-down" style="font-size:10px;margin-left:4px;"></i></button>
                <div class="oumta-tl-more-menu hidden">
                    ${overflow.map(id => `<button class="${id === active ? 'active' : ''}" data-wlid="${escapeAttr(id)}">${escapeHtml(workloadShort(id))}</button>`).join('')}
                </div>
            </div>` : '',
    ].filter(Boolean).join('');

    host.querySelectorAll('.oumta-tl-pill[data-wlid]').forEach(btn => {
        btn.addEventListener('click', () => setTimelineFilter(btn.dataset.wlid || null));
    });
    const moreBtn = host.querySelector('[data-tl-more]');
    const moreMenu = host.querySelector('.oumta-tl-more-menu');
    if (moreBtn && moreMenu) {
        moreBtn.addEventListener('click', (e) => {
            e.stopPropagation();
            moreMenu.classList.toggle('hidden');
        });
        moreMenu.querySelectorAll('button[data-wlid]').forEach(btn => {
            btn.addEventListener('click', () => {
                setTimelineFilter(btn.dataset.wlid || null);
                moreMenu.classList.add('hidden');
            });
        });
        document.addEventListener('click', (e) => {
            if (!moreMenu.contains(e.target) && e.target !== moreBtn) moreMenu.classList.add('hidden');
        }, { once: true });
    }
}

// ── 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 = (CONFIG.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();
}

// ── 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 ────────────────────────────────────────────────────

h?.registerPlugin?.({ name: 'oumta-dashboard', version: '0.1.0' });