// Resource detail: status header + dependencies + source docs + runbook pages + change history.
import { api } from '../api.js';
import { el, mount, clear, safeHref } from '../dom.js';

function statusClass(s) {
  return s === 'running' ? 'ok' : s === 'stopped' ? 'warn' : s === 'down' ? 'bad' : 'idle';
}

async function loadDependencies(id, listEl) {
  let deps = [];
  try { deps = await api.get(`/api/resources/${id}/dependencies`); }
  catch { /* */ }
  clear(listEl);
  if (!deps.length) {
    listEl.appendChild(el('li', { class: 'muted' }, '(no dependencies)'));
    return;
  }
  for (const d of deps) {
    listEl.appendChild(el('li', {},
      el('span', { class: 'status idle' }, d.kind || 'depends-on'),
      ' ',
      el('a', { href: '#/resource/' + d.depends_on }, d.depends_on.slice(0, 8) + '…')
    ));
  }
}

async function loadRunbooks(id, listEl) {
  clear(listEl);
  let links = [];
  try {
    const all = await api.get('/api/links/to/resource/' + id);
    links = all.filter(l => l.from_type === 'page' && l.relation === 'runbook');
  } catch { /* */ }
  if (!links.length) {
    listEl.appendChild(el('li', { class: 'muted' }, 'No runbook pages linked.'));
    return;
  }
  for (const l of links) {
    let title = l.from_id.slice(0, 8) + '…';
    try {
      const page = await api.get('/api/pages/' + l.from_id);
      title = page.title;
    } catch { /* keep id */ }
    listEl.appendChild(el('li', {}, el('a', { href: '#/page/' + l.from_id }, title)));
  }
}

async function loadChangeHistory(id, listEl) {
  clear(listEl);
  let rows = [];
  try { rows = await api.get('/api/resources/' + id + '/changes'); }
  catch { /* */ }
  if (!rows.length) {
    listEl.appendChild(el('li', { class: 'muted' }, 'No history yet.'));
    return;
  }
  for (const r of rows.slice(0, 20)) {
    listEl.appendChild(el('li', {},
      el('span', { class: 'muted' }, new Date(r.occurred_at).toISOString().slice(0, 16).replace('T', ' ') + ' — '),
      r.actor_kind, ' ', r.action
    ));
  }
}

async function loadSourceDocs(id, listEl) {
  clear(listEl);
  let docs = [];
  try { docs = await api.get('/api/resources/' + id + '/source-docs'); }
  catch { /* */ }
  if (!docs.length) {
    listEl.appendChild(el('li', { class: 'muted' }, 'No source docs.'));
    return;
  }
  for (const d of docs) {
    listEl.appendChild(el('li', {}, d.name, ' ', el('span', { class: 'muted', style: { fontSize: '11px' } }, d.upstream_url)));
  }
}

export async function render(main, ctx) {
  const id = ctx.params.id;
  mount(main, el('p', { class: 'view-sub muted' }, 'Loading …'));

  let res;
  try { res = await api.get('/api/resources/' + id); }
  catch (e) {
    mount(main,
      el('h1', { class: 'view-h1' }, 'Resource not found'),
      el('p', { class: 'view-sub muted' }, e.message)
    );
    return;
  }

  const depsList = el('ul', { class: 'plain' });
  const runbookList = el('ul', { class: 'plain' });
  const sdList = el('ul', { class: 'plain' });
  const histList = el('ul', { class: 'plain' });

  const depIdInput = el('input', { type: 'text', placeholder: 'depends_on UUID', style: { flex: 1 } });
  const depKindInput = el('input', { type: 'text', placeholder: 'kind (optional)', style: { width: '120px' } });
  async function addDep() {
    const dep = depIdInput.value.trim();
    if (!dep) return;
    try {
      await api.post(`/api/resources/${id}/dependencies`, { depends_on: dep, kind: depKindInput.value.trim() || null });
      depIdInput.value = ''; depKindInput.value = '';
      loadDependencies(id, depsList);
    } catch (e) { alert('add failed: ' + e.message); }
  }

  mount(main,
    el('h1', { class: 'view-h1' }, res.name),
    el('p', { class: 'view-sub' },
      el('span', { class: 'status ' + statusClass(res.status) }, res.status),
      ' · ', el('span', { class: 'status idle' }, res.runtime_type),
      res.host ? ' · ' + res.host : '',
      res.url ? ' · ' : '',
      res.url ? el('a', { href: safeHref(res.url), target: '_blank', rel: 'noopener noreferrer' }, res.url) : null
    ),
    el('div', { class: 'row' },
      el('div', { class: 'card' },
        el('h3', {}, 'Dependencies'),
        depsList,
        el('div', { style: { display: 'flex', gap: '8px', marginTop: '10px' } },
          depIdInput, depKindInput, el('button', { class: 'primary', onclick: addDep }, 'Link')
        )
      ),
      el('div', { class: 'card' },
        el('h3', {}, 'Source docs'),
        sdList
      ),
      el('div', { class: 'card' },
        el('h3', {}, 'Runbook pages'),
        runbookList
      )
    ),
    el('div', { class: 'card' }, el('h3', {}, 'Change history'), histList)
  );

  loadDependencies(id, depsList);
  loadSourceDocs(id, sdList);
  loadRunbooks(id, runbookList);
  loadChangeHistory(id, histList);
}