// /logs.html entry point: log viewer with three sub-tabs (AGENT, INFRA,
// SYSTEM). Build log history has moved to /builds.html.
// AGENT  — per-container journald viewer, backed by GET /api/journal/{name}
// INFRA  — infra-container journald viewer (hive-ci, hive-forge, …),
//          same API but full machine journal only (no unit filter)
// SYSTEM — host service logs, backed by GET /api/journal-host
//
// Tab routing via URL hash (#agent, #infra, #system). Default: #agent.
//
// URL params `?agent=name` and `?unit=svc` pre-select the agent + unit.
// When `?agent=` names an infra container the INFRA tab is activated instead.
// Last-fetched timestamp is shown next to the refresh button on AGENT,
// INFRA, and SYSTEM tabs so the operator knows how stale the output is.

import {
  $, fmtAgeSecs, initServerWarnings,
} from './common.js';
import { el } from '@hive/shared/dom.js';
import '@hive/shared/hive-tab-strip.js';

(() => {
  initServerWarnings();

  // ─── tab routing ──────────────────────────────────────────────────────
  // The shared hash-routed tab strip (@hive/shared/tabs.js) handles the
  // active toggle + aria-selected + pane visibility + lazy fetches via
  // onShow. Constructed in the init block below (after the fetch fns +
  // element refs it depends on exist). `logTabs.active()` replaces the
  // old `activeTab()`.
  let logTabs;

  // ─── helpers ──────────────────────────────────────────────────────────

  // Format a last-fetched timestamp: "fetched just now" / "fetched 3m ago".
  function fmtFetchTs(fetchedAt) {
    const ageSecs = Math.floor((Date.now() - fetchedAt) / 1000);
    return 'fetched ' + (ageSecs < 5 ? 'just now' : fmtAgeSecs(ageSecs) + ' ago');
  }

  // ─── AGENT tab ────────────────────────────────────────────────────────

  const agentSelect     = $('agent-select');
  const agentUnitSelect = $('agent-unit-select');
  const agentRefresh    = $('agent-refresh');
  const agentOutput     = $('agent-output');
  const agentFetchTs    = $('agent-fetch-ts');

  let agentFetching = false;
  let agentLastFetch = 0;
  async function fetchAgent() {
    if (!agentSelect || !agentOutput) return;
    const name = agentSelect.value;
    if (!name) { agentOutput.textContent = 'select an agent above'; return; }
    if (agentFetching) return;
    agentFetching = true;
    agentOutput.textContent = 'fetching…';
    if (agentFetchTs) agentFetchTs.hidden = true;
    const unit = agentUnitSelect ? agentUnitSelect.value : '';
    const params = new URLSearchParams({ lines: '500' });
    if (unit) params.set('unit', unit);
    try {
      const resp = await fetch('/api/journal/' + encodeURIComponent(name) + '?' + params);
      const text = await resp.text();
      agentOutput.textContent = resp.ok ? (text || '(empty)') : 'error ' + resp.status + '\n' + text;
      agentOutput.scrollTop = agentOutput.scrollHeight;
      if (resp.ok) {
        agentLastFetch = Date.now();
        if (agentFetchTs) {
          agentFetchTs.textContent = fmtFetchTs(agentLastFetch);
          agentFetchTs.hidden = false;
        }
      }
    } catch (err) {
      agentOutput.textContent = 'fetch failed: ' + err;
    } finally {
      agentFetching = false;
    }
  }

  if (agentSelect)     agentSelect.addEventListener('change', fetchAgent);
  if (agentUnitSelect) agentUnitSelect.addEventListener('change', fetchAgent);
  if (agentRefresh)    agentRefresh.addEventListener('click', fetchAgent);

  // ─── INFRA tab ────────────────────────────────────────────────────────
  // Infra containers (hive-ci, hive-forge, hive-gateway, hive-matrix) don't
  // run the per-agent hive daemons, so the unit filter is inapplicable. We
  // always fetch the full machine journal for them.

  const infraSelect  = $('infra-select');
  const infraRefresh = $('infra-refresh');
  const infraOutput  = $('infra-output');
  const infraFetchTs = $('infra-fetch-ts');

  let infraFetching = false;
  let infraLastFetch = 0;
  async function fetchInfra() {
    if (!infraSelect || !infraOutput) return;
    const name = infraSelect.value;
    if (!name) { infraOutput.textContent = 'select a container above'; return; }
    if (infraFetching) return;
    infraFetching = true;
    infraOutput.textContent = 'fetching…';
    if (infraFetchTs) infraFetchTs.hidden = true;
    const params = new URLSearchParams({ lines: '500' });
    try {
      const resp = await fetch('/api/journal/' + encodeURIComponent(name) + '?' + params);
      const text = await resp.text();
      infraOutput.textContent = resp.ok ? (text || '(empty)') : 'error ' + resp.status + '\n' + text;
      infraOutput.scrollTop = infraOutput.scrollHeight;
      if (resp.ok) {
        infraLastFetch = Date.now();
        if (infraFetchTs) {
          infraFetchTs.textContent = fmtFetchTs(infraLastFetch);
          infraFetchTs.hidden = false;
        }
      }
    } catch (err) {
      infraOutput.textContent = 'fetch failed: ' + err;
    } finally {
      infraFetching = false;
    }
  }

  if (infraSelect)  infraSelect.addEventListener('change', fetchInfra);
  if (infraRefresh) infraRefresh.addEventListener('click', fetchInfra);

  // Fixed allowlist — the four hive infra services never change at
  // runtime, and there's no dashboard API exposing just the name list
  // (the one that used to, `/api/state`'s `infra_containers` field, was
  // start/stop-panel-only and is gone). Mirrors `hive_priv_sock::InfraContainer::ALL`.
  const INFRA_NAMES = ['hive-ci', 'hive-forge', 'hive-gateway', 'hive-matrix'];

  // ─── container list init ──────────────────────────────────────────────
  // Fetch /api/state once to populate the AGENT selector (agents only);
  // INFRA is a fixed list (see INFRA_NAMES). Also handles the ?agent= /
  // ?unit= deep-link, routing to the INFRA tab when the named container
  // is an infra container.
  async function loadContainerLists() {
    if (infraSelect) {
      infraSelect.replaceChildren();
      infraSelect.append(el('option', { value: '' }, '— select container —'));
      for (const name of INFRA_NAMES) {
        infraSelect.append(el('option', { value: name }, name));
      }
    }
    try {
      const resp = await fetch('/api/state');
      if (!resp.ok) return;
      const state = await resp.json();

      // Populate AGENT selector (agents only — no infra optgroup).
      if (agentSelect) {
        agentSelect.replaceChildren();
        agentSelect.append(el('option', { value: '' }, '— select agent —'));
        for (const c of (state.containers || [])) {
          agentSelect.append(el('option', { value: c.name }, c.name));
        }
      }

      // Deep-link: honour ?agent= and ?unit= URL params.
      const urlAgent = new URLSearchParams(location.search).get('agent');
      const urlUnit  = new URLSearchParams(location.search).get('unit');
      if (urlAgent) {
        if (INFRA_NAMES.includes(urlAgent)) {
          // Route to INFRA tab.
          logTabs.show('infra');
          if (infraSelect) {
            infraSelect.value = urlAgent;
            fetchInfra();
          }
        } else if (agentSelect) {
          // Route to AGENT tab.
          const found = Array.from(agentSelect.options).some((o) => o.value === urlAgent);
          if (found) {
            agentSelect.value = urlAgent;
            if (urlUnit && agentUnitSelect) {
              const unitFound = Array.from(agentUnitSelect.options)
                .some((o) => o.value === urlUnit);
              if (unitFound) agentUnitSelect.value = urlUnit;
            }
            fetchAgent();
          }
        }
      }
    } catch { /**/ }
  }

  // ─── SYSTEM tab ───────────────────────────────────────────────────────

  const systemUnitSelect = $('system-unit-select');
  const systemRefresh    = $('system-refresh');
  const systemOutput     = $('system-output');
  const systemFetchTs    = $('system-fetch-ts');

  let systemFetching = false;
  let systemLastFetch = 0;
  async function fetchSystem() {
    if (!systemOutput) return;
    if (systemFetching) return;
    systemFetching = true;
    systemOutput.textContent = 'fetching…';
    if (systemFetchTs) systemFetchTs.hidden = true;
    const unit = systemUnitSelect ? systemUnitSelect.value : 'hive-c0re.service';
    const params = new URLSearchParams({ lines: '500' });
    if (unit) params.set('unit', unit);
    try {
      const resp = await fetch('/api/journal-host?' + params);
      const text = await resp.text();
      systemOutput.textContent = resp.ok ? (text || '(empty)') : 'error ' + resp.status + '\n' + text;
      systemOutput.scrollTop = systemOutput.scrollHeight;
      if (resp.ok) {
        systemLastFetch = Date.now();
        if (systemFetchTs) {
          systemFetchTs.textContent = fmtFetchTs(systemLastFetch);
          systemFetchTs.hidden = false;
        }
      }
    } catch (err) {
      systemOutput.textContent = 'fetch failed: ' + err;
    } finally {
      systemFetching = false;
    }
  }

  if (systemUnitSelect) systemUnitSelect.addEventListener('change', fetchSystem);
  if (systemRefresh)    systemRefresh.addEventListener('click', fetchSystem);

  // ─── init ─────────────────────────────────────────────────────────────

  // Wire the shared tab strip now that fetchSystem + the element refs it
  // needs are defined. Its initial show() paints the active pane and, if
  // the deep-linked tab is SYSTEM, kicks off the lazy fetch via onShow.
  // Default: AGENT (build logs moved to /builds.html).
  logTabs = document.getElementById('logs-tabbar').configure({
    tabs: [
      { id: 'agent', label: 'AGENT' },
      { id: 'infra', label: 'INFRA' },
      { id: 'system', label: 'SYSTEM' },
    ],
    defaultId: 'agent',
    onShow: (id) => {
      if (id === 'system') fetchSystem();
    },
  });
  loadContainerLists();

  // Tick the last-fetched timestamps every 30s so "fetched 1m ago" stays
  // accurate without a manual refresh.
  setInterval(() => {
    if (agentLastFetch && agentFetchTs && !agentFetchTs.hidden) {
      agentFetchTs.textContent = fmtFetchTs(agentLastFetch);
    }
    if (infraLastFetch && infraFetchTs && !infraFetchTs.hidden) {
      infraFetchTs.textContent = fmtFetchTs(infraLastFetch);
    }
    if (systemLastFetch && systemFetchTs && !systemFetchTs.hidden) {
      systemFetchTs.textContent = fmtFetchTs(systemLastFetch);
    }
  }, 30_000);

})();