{% extends "base.html" %}
{% block title %}{% if is_new %}New theme{% else %}Edit {{ name }}{% endif %} · Wordsmith{% endblock %}
{% block content %}
<section class="container">
  <div class="crumbs">
    <a href="/themes">themes</a>
    <span class="sep">/</span>
    <span class="here">{% if is_new %}new{% else %}{{ slug }}{% endif %}</span>
  </div>

  <div class="page-head">
    <div class="page-head__title">
      <div class="eyebrow">№ 03 · Workbench</div>
      <h1>{% if is_new %}New theme{% else %}Edit theme{% endif %}</h1>
    </div>
    {% if not is_new %}
    <div class="page-head__meta">slug · {{ slug }}</div>
    {% endif %}
  </div>
  <hr class="section-rule" />

  {% if errors %}
  <div class="notice">
    <strong>Hold on</strong>
    <ul>
      {% for e in errors %}<li>{{ e }}</li>{% endfor %}
    </ul>
  </div>
  {% endif %}

  <form method="post"
        action="{% if is_new %}/themes{% else %}/themes/{{ slug }}{% endif %}">

    <div class="row" style="margin-bottom: var(--s-4);">
      <label class="field">
        <span class="field__label">Theme name</span>
        <input type="text" name="name" id="name" value="{{ name }}" required />
      </label>
      <label class="field">
        <span class="field__label">Slug</span>
        <input type="text" name="slug" id="slug" value="{{ slug }}"
               {% if not is_new %}readonly{% endif %} />
        <span class="field__hint">lowercase letters, digits, hyphens · auto-generated on create</span>
      </label>
    </div>

    <div class="workbench">
      <label class="field">
        <span class="field__label">Words · one per line</span>
        <textarea name="words" id="words">{{ words_text }}</textarea>
      </label>

      <aside class="panel panel--inset" aria-label="Live preview">
        <div class="preview-card__head" style="margin: -4px 0 12px;">
          <span class="preview-card__title">Live preview</span>
          <span class="mono muted" style="font-size:11px;" id="word-count">0 entries</span>
        </div>
        <div class="preview-list" id="preview-list">
          <div class="muted">Type words to see the grid form.</div>
        </div>
        <div class="stat-row" id="word-stats">
          <span>no words yet</span>
        </div>
      </aside>
    </div>

    <div class="bottom-bar">
      <button class="btn" type="submit">Save</button>
      <a class="btn btn--ghost" href="/themes">Cancel</a>
      <span class="spacer"></span>
      {% if not is_new %}
      <form method="post" action="/themes/{{ slug }}/delete"
            onsubmit="return confirm('Delete theme {{ name }}?');">
        <button class="btn btn--danger" type="submit">⌫ Delete theme</button>
      </form>
      {% endif %}
    </div>
  </form>
</section>
{% endblock %}

{% block scripts %}
<script>
(function () {
  const nameEl = document.getElementById('name');
  const slugEl = document.getElementById('slug');
  const wordsEl = document.getElementById('words');
  const list = document.getElementById('preview-list');
  const count = document.getElementById('word-count');
  const stats = document.getElementById('word-stats');
  const isNew = {{ 'true' if is_new else 'false' }};

  function slugify(s) {
    return s.toLowerCase().trim().replace(/[^a-z0-9]+/g, '-').replace(/^-|-$/g, '');
  }

  if (isNew && nameEl && slugEl) {
    nameEl.addEventListener('input', () => {
      if (!slugEl.dataset.touched) slugEl.value = slugify(nameEl.value);
    });
    slugEl.addEventListener('input', () => { slugEl.dataset.touched = '1'; });
  }

  let timer = null;
  async function refresh() {
    const lines = wordsEl.value.split('\n').map(s => s.trim()).filter(Boolean);
    if (lines.length === 0) {
      list.innerHTML = '<div class="muted">Type words to see the grid form.</div>';
      count.textContent = '0 entries';
      stats.innerHTML = '<span>no words yet</span>';
      return;
    }
    let data;
    try {
      const res = await fetch('/api/normalise', {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify({words: lines}),
      });
      data = await res.json();
    } catch (e) {
      list.innerHTML = '<div class="muted">Preview failed.</div>';
      return;
    }

    list.innerHTML = data.map(item => {
      if (item.skipped) {
        return `<div class="row skipped"><span class="src">${item.display}</span><span class="dst">(skipped)</span></div>`;
      }
      return `<div class="row"><span class="src">${item.display}</span><span class="dst">${item.grid}</span></div>`;
    }).join('');

    const placeable = data.filter(d => !d.skipped);
    count.textContent = `${data.length} ${data.length === 1 ? 'entry' : 'entries'}`;

    if (placeable.length) {
      const lens = placeable.map(d => d.grid.length);
      const minIdx = lens.indexOf(Math.min(...lens));
      const maxIdx = lens.indexOf(Math.max(...lens));
      const min = placeable[minIdx];
      const max = placeable[maxIdx];
      const avg = (lens.reduce((a, b) => a + b, 0) / lens.length).toFixed(1);
      stats.innerHTML = `
        <span>shortest · ${min.grid} (${min.grid.length})</span>
        <span>longest · ${max.grid} (${max.grid.length})</span>
        <span>avg · ${avg}</span>`;
    } else {
      stats.innerHTML = '<span>nothing placeable</span>';
    }
  }

  if (wordsEl) {
    wordsEl.addEventListener('input', () => {
      clearTimeout(timer);
      timer = setTimeout(refresh, 250);
    });
    refresh();
  }
})();
</script>
{% endblock %}