// One image model per workflow, plus the models to try when it fails.
//
// A single model means a refusal, a rate limit or a model the gateway has since
// dropped ends as a missing picture. The chain is primary first, then each
// fallback in order, and it stops at the first one that produces an image —
// every hop being a paid request is why it is capped rather than open-ended.
import { imageJson } from '../generatedImages.js';

const WORKFLOWS = [
  { key: 'clinical_assistant', label: 'Clinical Assistant' },
  { key: 'my_resources', label: 'My Resources' }
];

let loading = false;
let loaded = false;
let controls = {};
let maxModels = 3;

async function load() {
  const root = document.getElementById('workflow-image-settings');
  if (root && !root.children.length) loaded = false; // fresh DOM (test/re-import) re-renders
  if (!root || loaded || loading) return;
  loading = true;
  try {
    const [settings, models] = await Promise.all([
      imageJson('/api/admin/image-settings'),
      imageJson('/api/admin/config/image-models/discover').catch(() => ({ success: false }))
    ]);
    maxModels = Number(settings.maxModels) || 3;
    const discovered = Array.isArray(models.models) ? models.models : [];
    root.textContent = '';

    const form = document.createElement('form');
    const note = document.createElement('p');
    note.style.cssText = 'margin:2px 0 10px;font-size:12px;color:var(--g500);';
    note.textContent = 'Each workflow tries its model first, then its fallbacks in order, ' +
      'stopping at the first that produces an image. A fallback is only tried when another ' +
      'model has a real chance — a refusal, a rate limit, a provider fault, or a model the ' +
      'gateway does not have. Bad credentials and a malformed request stop immediately.';
    form.append(note);

    controls = {};
    WORKFLOWS.forEach(workflow => {
      const saved = settings.workflows[workflow.key] || {};
      const group = document.createElement('fieldset');
      group.style.cssText = 'border:1px solid var(--g200);border-radius:8px;padding:12px;margin:0 0 12px;';
      const legend = document.createElement('legend');
      legend.style.cssText = 'font-size:12px;font-weight:600;color:var(--g700);padding:0 6px;';
      legend.textContent = workflow.label;
      group.appendChild(legend);

      // My Resources picks its model per request from the roster, so only the
      // Both workflows name a model. My Resources' was saved and ignored for a
      // while — the generator read the Assistant's setting instead — so the
      // field was disabled and labelled "set per request", describing something
      // that happens nowhere. It works now, and blank means "use the Clinical
      // Assistant's", which is what every install did before it worked.
      const primary = makeSelect([saved.model], discovered);
      group.appendChild(row('Model', primary));
      if (workflow.key === 'my_resources') {
        const note = document.createElement('p');
        note.style.cssText = 'margin:2px 0 10px;font-size:12px;color:var(--g500);';
        note.textContent = 'Leave blank to use the Clinical Assistant\'s image model above.';
        group.appendChild(note);
      }

      const fallbacks = [];
      for (let i = 0; i < maxModels - 1; i++) {
        const select = makeSelect([(saved.fallbacks || [])[i] || ''], discovered, true);
        fallbacks.push(select);
        group.appendChild(row('Fallback ' + (i + 1), select));
      }

      const budget = makeBudget(saved.budget);
      group.appendChild(row('Image input budget', budget));

      controls[workflow.key] = { primary, fallbacks, budget };
      form.appendChild(group);
    });

    // No Save of its own: this form sits inside the Availability card, whose
    // one Save button saves it along with the rest. Enter in a field goes
    // through that button too, so there is exactly one way to save the card.
    form.onsubmit = e => {
      e.preventDefault();
      const save = document.getElementById('btn-save-availability');
      if (save && !save.disabled) save.click();
    };
    root.append(form);
    loaded = true;
  } catch (_) { /* Next tab entry retries; no drafts are touched. */ }
  finally { loading = false; }
}

// Called by the Availability card's Save. Rejects rather than quietly skipping
// when the form never rendered, so the card does not report "Saved" for
// settings that were not sent.
export async function saveImageSettings() {
  if (!loaded) throw new Error('Image settings were not loaded, so they were not saved.');
  // What was written, for the card's confirmation. "Saved" alone does not
  // answer the question an admin actually has, which is whether the model they
  // just picked is the one that will be used.
  const written = [];
  for (const workflow of WORKFLOWS) {
    const control = controls[workflow.key];
    const body = {
      budget: Number(control.budget.value),
      fallbacks: control.fallbacks.map(s => s.value).filter(Boolean)
    };
    // Every workflow sends its model. My Resources' used to be withheld,
    // which is why its field could never be set to anything.
    body.model = control.primary.value;
    await imageJson('/api/admin/image-settings/' + workflow.key,
      { method: 'PUT', body: JSON.stringify(body) });
    written.push(workflow.label + ': ' +
      (body.model || 'the Clinical Assistant\'s model') +
      (body.fallbacks.length ? ', then ' + body.fallbacks.join(', ') : ', no fallback'));
  }
  return written;
}

function row(labelText, control) {
  const wrap = document.createElement('div');
  wrap.className = 'admin-row';
  const label = document.createElement('label');
  label.className = 'admin-row-label';
  label.textContent = labelText;
  wrap.append(label, control);
  return wrap;
}

function makeSelect(knownIds, models, optional) {
  const select = document.createElement('select');
  select.className = 'admin-control';
  if (optional) {
    const none = document.createElement('option');
    none.value = ''; none.textContent = 'None';
    select.appendChild(none);
  }
  const ids = new Set([...(Array.isArray(knownIds) ? knownIds : []).filter(Boolean),
    ...((Array.isArray(models) ? models : []).map(m => m && m.id).filter(Boolean))]);
  [...ids].sort().forEach(id => {
    const option = document.createElement('option');
    option.value = id; option.textContent = id;
    select.appendChild(option);
  });
  select.value = knownIds[0] || '';
  return select;
}

function makeBudget(value) {
  const input = document.createElement('input');
  input.className = 'admin-control';
  input.type = 'number'; input.min = '1000'; input.max = '32000'; input.required = true;
  input.value = value;
  return input;
}

export function initImageSettings() {
  document.addEventListener('tabChanged', e => { if (e.detail?.tab === 'admin') load(); });
  // A model added in the Models card has to show up in these dropdowns without
  // a page reload. `loaded` exists so a tab revisit does not refetch; a roster
  // change is the one case where refetching is the point.
  document.addEventListener('models-changed', () => {
    if (loading) return;
    loaded = false;
    load();
  });
}