// panes/diffusion.js — Stable Diffusion proxy with prompt presets, model picker, gallery history.
import { registerPane } from '../app.js';
import { jget, jpost, escapeHtml } from '../lib/api.js';
import { fmtJSON, ok, err, copyToClipboard, historyStore } from '../lib/ui.js';

const galleryHist = historyStore('cx_diff_gallery', 12);

const PROMPT_PRESETS = [
  { label: 'Portrait',   prompt: 'a cinematic portrait of a person, soft natural light, 50mm lens, bokeh, photorealistic, sharp focus', neg: 'blurry, deformed, text, watermark' },
  { label: 'Landscape',  prompt: 'sweeping mountain landscape at golden hour, dramatic clouds, ultra-detailed, 8k, photoreal',          neg: 'low quality, jpeg artifacts, signature' },
  { label: 'Anime',      prompt: 'anime illustration, vibrant colors, detailed face, dynamic pose, by Makoto Shinkai, masterpiece',     neg: 'realistic, blurry, lowres, bad anatomy' },
  { label: 'Photoreal',  prompt: 'photoreal product shot, studio lighting, white background, high detail, hyperreal',                   neg: 'illustration, painting, low quality' },
  { label: 'Cyberpunk',  prompt: 'cyberpunk street, neon signs, rain, reflective puddles, futuristic, cinematic lighting',              neg: 'daylight, bright, cartoon' },
];

const TPL = `
  <div class="pane-head">
    <div><div class="title">Diffusion</div><div class="sub">Generate via the diffusion sidecar.</div></div>
    <div class="grow"></div>
    <span class="pill" id="diff-pill"><span class="dot"></span><span id="diff-pill-text">—</span></span>
  </div>

  <div class="grid cols-2 mb-3">
    <div class="card">
      <div class="card-title"><h2>Prompt</h2></div>
      <div class="chips mb-3" id="diff-presets"></div>
      <form id="diff-form" class="grid gap-3">
        <label class="field"><span class="lbl">Prompt</span><textarea class="input" id="diff-prompt" rows="3" required></textarea></label>
        <label class="field"><span class="lbl">Negative prompt</span><textarea class="input" id="diff-neg" rows="2"></textarea></label>
        <div class="grid cols-3 gap-3">
          <label class="field"><span class="lbl">Steps</span><input class="input" id="diff-steps" type="number" value="20" min="1"/></label>
          <label class="field"><span class="lbl">CFG</span><input class="input" id="diff-cfg" type="number" value="7" step="0.5"/></label>
          <label class="field"><span class="lbl">Seed</span><input class="input" id="diff-seed" type="number" value="-1" title="-1 = random"/></label>
        </div>
        <div class="grid cols-3 gap-3">
          <label class="field"><span class="lbl">Width</span><input class="input" id="diff-w" type="number" value="512" step="64"/></label>
          <label class="field"><span class="lbl">Height</span><input class="input" id="diff-h" type="number" value="512" step="64"/></label>
          <label class="field"><span class="lbl">Batch</span><input class="input" id="diff-batch" type="number" value="1" min="1" max="8"/></label>
        </div>
        <div class="grid cols-2 gap-3">
          <label class="field"><span class="lbl">Model</span><select class="input" id="diff-model"><option value="">(default)</option></select></label>
          <label class="field"><span class="lbl">Sampler</span><select class="input" id="diff-sampler"><option value="">(default)</option></select></label>
        </div>
        <div class="btn-row">
          <button class="btn btn-primary" type="submit" id="diff-submit">Generate</button>
          <button class="btn btn-secondary" type="button" id="diff-progress">Progress</button>
          <button class="btn btn-ghost" type="reset">Reset</button>
        </div>
      </form>
    </div>
    <div class="card">
      <div class="card-title"><h2>Output</h2><span class="muted mono xsmall" id="diff-status">—</span></div>
      <div class="gallery" id="diff-gallery" style="display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:8px"></div>
      <div class="divider"></div>
      <div class="card-title"><h2 style="font-size:14px">Meta</h2><button class="btn btn-ghost" id="diff-copy-meta">Copy</button></div>
      <pre id="diff-meta" class="code" style="max-height:18vh">—</pre>
    </div>
  </div>

  <div class="card">
    <div class="card-title"><h2>Recent generations</h2><button class="btn btn-ghost" id="diff-clear-hist">Clear</button></div>
    <div id="diff-history" style="display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:8px"></div>
  </div>
`;

async function probe(host) {
  const pill = host.querySelector('#diff-pill');
  try {
    const h = await jget('/api/diffusion/healthz');
    pill.classList.remove('err'); pill.classList.add('ok');
    host.querySelector('#diff-pill-text').textContent = `up · ${h.backend ?? '?'}`;
  } catch (e) {
    pill.classList.remove('ok'); pill.classList.add('err');
    host.querySelector('#diff-pill-text').textContent = 'down';
  }
}

async function loadModels(host) {
  try {
    const m = await jget('/api/diffusion/v1/models');
    const sel = host.querySelector('#diff-model');
    (m.models || m || []).forEach(x => {
      const name = x.model_name || x.name || x.id || x;
      sel.insertAdjacentHTML('beforeend', `<option value="${escapeHtml(String(name))}">${escapeHtml(String(name))}</option>`);
    });
  } catch {}
  try {
    const s = await jget('/api/diffusion/v1/samplers');
    const sel = host.querySelector('#diff-sampler');
    (s.samplers || s || []).forEach(x => {
      const n = x.name || x;
      sel.insertAdjacentHTML('beforeend', `<option value="${escapeHtml(String(n))}">${escapeHtml(String(n))}</option>`);
    });
  } catch {}
}

function renderHistory(host) {
  const items = galleryHist.list();
  host.querySelector('#diff-history').innerHTML = items.length
    ? items.map((g, i) => `<button class="card no-pad" data-hi="${i}" title="${escapeHtml(g.prompt)}" style="border:1px solid var(--border);cursor:pointer;padding:0">
        <img src="data:image/png;base64,${g.b64}" style="width:100%;display:block;border-radius:4px"/>
        <div class="p-2 truncate muted xsmall">${escapeHtml(g.prompt)}</div>
      </button>`).join('')
    : '<div class="muted xsmall p-2">no history yet</div>';
  host.querySelectorAll('#diff-history [data-hi]').forEach(b => b.addEventListener('click', () => {
    const g = galleryHist.list()[+b.dataset.hi];
    if (!g) return;
    host.querySelector('#diff-prompt').value = g.prompt;
    host.querySelector('#diff-neg').value = g.neg || '';
    if (g.seed != null) host.querySelector('#diff-seed').value = g.seed;
  }));
}

registerPane('diffusion', {
  label: 'Diffusion',
  init(host) {
    host.innerHTML = TPL;
    host.querySelector('#diff-presets').innerHTML = PROMPT_PRESETS.map((p, i) =>
      `<button class="chip" data-pi="${i}" type="button">${escapeHtml(p.label)}</button>`).join('');
    host.querySelectorAll('#diff-presets .chip').forEach(b => b.addEventListener('click', () => {
      const p = PROMPT_PRESETS[+b.dataset.pi];
      host.querySelector('#diff-prompt').value = p.prompt;
      host.querySelector('#diff-neg').value    = p.neg;
    }));

    probe(host); loadModels(host); renderHistory(host);

    host.querySelector('#diff-form').addEventListener('submit', async (e) => {
      e.preventDefault();
      const btn = host.querySelector('#diff-submit'); btn.disabled = true;
      host.querySelector('#diff-status').textContent = 'generating…';
      const seed = +host.querySelector('#diff-seed').value;
      const body = {
        prompt: host.querySelector('#diff-prompt').value,
        negative_prompt: host.querySelector('#diff-neg').value,
        steps: +host.querySelector('#diff-steps').value || 20,
        width:  +host.querySelector('#diff-w').value || 512,
        height: +host.querySelector('#diff-h').value || 512,
        cfg_scale: +host.querySelector('#diff-cfg').value || 7,
        batch_size: +host.querySelector('#diff-batch').value || 1,
      };
      if (seed >= 0) body.seed = seed;
      const sm = host.querySelector('#diff-sampler').value; if (sm) body.sampler_name = sm;
      const md = host.querySelector('#diff-model').value;   if (md) body.model = md;
      try {
        const r = await jpost('/api/diffusion/v1/generate', body);
        host.querySelector('#diff-gallery').innerHTML = (r.images || []).map((b64, i) =>
          `<a download="cxai-diff-${Date.now()}-${i}.png" href="data:image/png;base64,${b64}"><img src="data:image/png;base64,${b64}" alt="generated" style="width:100%;border-radius:4px;display:block"/></a>`
        ).join('');
        host.querySelector('#diff-meta').textContent = fmtJSON({ seeds: r.seeds, duration_s: r.duration_s, model: r.model, sampler: r.sampler });
        host.querySelector('#diff-status').textContent = `ok · ${r.duration_s?.toFixed?.(2) ?? '?'}s · ${(r.images || []).length} img`;
        (r.images || []).forEach((b64, i) => galleryHist.push({
          b64, prompt: body.prompt, neg: body.negative_prompt, seed: r.seeds?.[i],
        }));
        renderHistory(host);
        ok('Generated');
      } catch (e) {
        host.querySelector('#diff-status').textContent = `error ${e.status ?? ''}`;
        host.querySelector('#diff-meta').textContent = fmtJSON(e.body ?? { error: e.message });
        err(e.message);
      } finally { btn.disabled = false; }
    });

    host.querySelector('#diff-progress').addEventListener('click', async () => {
      try { host.querySelector('#diff-meta').textContent = fmtJSON(await jget('/api/diffusion/v1/progress')); }
      catch (e) { host.querySelector('#diff-meta').textContent = e.message; }
    });
    host.querySelector('#diff-copy-meta').addEventListener('click', () => copyToClipboard(host.querySelector('#diff-meta').textContent));
    host.querySelector('#diff-clear-hist').addEventListener('click', () => {
      if (!confirm('Clear gallery history?')) return;
      galleryHist.clear(); renderHistory(host);
    });
  },
});