{% extends "admin/base.html" %}
{% block title %}{{ 'Edit topic' if topic else 'New topic' }}{% endblock %}

{% block head_extra %}
<link href="{{ url_for('static', filename='vendor/quill.snow.css') }}" rel="stylesheet">
<link href="{{ url_for('static', filename='vendor/quill-table-better.css') }}" rel="stylesheet">
{% endblock %}

{% macro val(field, default='') -%}
  {%- if form is not none -%}{{ form.get(field, default) }}
  {%- elif topic is not none -%}{{ topic[field] if topic[field] is not none else default }}
  {%- else -%}{{ default }}{%- endif -%}
{%- endmacro %}

{% block content %}
{% set current_section = (form.get('section_id') if form else (topic.section_id if topic else request.args.get('section'))) %}
{% set current_media = (form.get('media_type') if form else (topic.media_type if topic else 'none')) %}

<header class="page-head">
  <div>
    <h1>{{ 'Edit topic' if topic else 'New topic' }}</h1>
    <p class="muted">{{ topic.title if topic else 'Add a new topic to a section.' }}</p>
  </div>
  <a class="btn btn--ghost" href="{{ url_for('admin.dashboard') }}">← Back</a>
</header>

<form method="post" class="form-card stack"
      action="{{ url_for('admin.topic_form', topic_id=topic.id) if topic else url_for('admin.topic_form') }}">
  <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">

  <div class="grid-2">
    <label class="field">
      <span>Section *</span>
      <select name="section_id" required>
        {% for s in sections %}
        <option value="{{ s.id }}" {{ 'selected' if current_section and s.id|string == current_section|string }}>
          §{{ '%02d' % s.num }} — {{ s.title }}
        </option>
        {% endfor %}
      </select>
    </label>
    <label class="field">
      <span>Sort order</span>
      <input type="number" name="sort_order" value="{{ val('sort_order', '10') }}">
    </label>
  </div>

  <label class="field">
    <span>Title *</span>
    <input type="text" name="title" value="{{ val('title') }}" required>
  </label>

  <label class="field">
    <span>Slug <small class="muted">(optional — auto-generated from the title, must be unique)</small></span>
    <input type="text" name="slug" value="{{ val('slug') }}" placeholder="auto">
  </label>

  <div class="field">
    <span>Body</span>
    <div id="editor-toolbar" class="ql-tools">
      <span class="ql-formats">
        <button class="ql-bold"></button>
        <button class="ql-italic"></button>
        <button class="ql-underline"></button>
        <button class="ql-strike"></button>
      </span>
      <span class="ql-formats">
        <button class="ql-header" value="2"></button>
        <button class="ql-header" value="3"></button>
      </span>
      <span class="ql-formats">
        <button class="ql-list" value="ordered"></button>
        <button class="ql-list" value="bullet"></button>
        <button class="ql-blockquote"></button>
      </span>
      <span class="ql-formats">
        <button class="ql-link"></button>
        <button class="ql-image" title="Insert image"></button>
        <button class="ql-clean"></button>
      </span>
      <span class="ql-formats">
        <button class="ql-table-better" title="Insert table"></button>
      </span>
    </div>
    <div id="editor"></div>
    <!-- Real field. Quill enhances it; if Quill fails to load, this stays a
         usable raw-HTML textarea so a save never wipes the body. -->
    <textarea name="body_html" id="body_src" rows="7">{{ val('body_html') }}</textarea>
  </div>

  {% set pub = (form.get('is_published') == '1') if form is not none else (topic.is_published if topic else True) %}
  <label class="field field--check">
    <input type="checkbox" name="is_published" value="1" {{ 'checked' if pub }}>
    <span>Published <small class="muted">(uncheck to keep as a draft — hidden from the public site)</small></span>
  </label>

  <fieldset class="fieldset">
    <legend>Media</legend>
    <div class="grid-2">
      <label class="field">
        <span>Type</span>
        <select name="media_type">
          {% for mt in media_types %}
          <option value="{{ mt }}" {{ 'selected' if mt == current_media }}>{{ mt }}</option>
          {% endfor %}
        </select>
      </label>
      <label class="field">
        <span>Caption</span>
        <input type="text" name="media_caption" value="{{ val('media_caption') }}">
      </label>
    </div>
    <label class="field">
      <span>Media URL</span>
      <input type="text" name="media_url" value="{{ val('media_url') }}"
             placeholder="/static/img/photo.jpg  ·  /static/vid/demo.mp4  ·  https://www.youtube.com/embed/ID">
    </label>
    <p class="hint muted">image → &lt;img&gt; · video → &lt;video&gt; · embed → &lt;iframe&gt; (use a YouTube <code>/embed/</code> URL)</p>
  </fieldset>

  <fieldset class="fieldset">
    <legend>Link button (optional)</legend>
    <div class="grid-2">
      <label class="field">
        <span>Link URL</span>
        <input type="text" name="link_url" value="{{ val('link_url') }}" placeholder="https://…">
      </label>
      <label class="field">
        <span>Link label</span>
        <input type="text" name="link_label" value="{{ val('link_label') }}" placeholder="Learn more">
      </label>
    </div>
  </fieldset>

  <div class="form-actions">
    <a class="btn btn--ghost" href="{{ url_for('admin.dashboard') }}">Cancel</a>
    <button class="btn btn--primary" type="submit">Save topic</button>
  </div>
</form>
{% endblock %}

{% block scripts %}
<script src="{{ url_for('static', filename='vendor/quill.min.js') }}"></script>
<script src="{{ url_for('static', filename='vendor/quill-table-better.js') }}"></script>
<script>
  (function () {
    if (typeof Quill === 'undefined') return;   // textarea stays usable
    var ta = document.getElementById('body_src');
    var toolbarEl = document.getElementById('editor-toolbar');
    var editorEl = document.getElementById('editor');

    // quill-table-better: resizable columns/rows + a cell menu for alignment,
    // borders and background. Registered only if the vendor script loaded.
    var hasTables = typeof QuillTableBetter !== 'undefined';
    if (hasTables) {
      Quill.register({ 'modules/table-better': QuillTableBetter }, true);
    }

    var modules = { toolbar: toolbarEl };
    if (hasTables) {
      modules.table = false;                       // disable Quill's basic table
      modules['table-better'] = {
        language: 'en_US',
        menus: ['column', 'row', 'merge', 'table', 'cell', 'wrap', 'delete'],
        toolbarTable: true
      };
      modules.keyboard = { bindings: QuillTableBetter.keyboardBindings };
    }

    var quill = new Quill(editorEl, { theme: 'snow', modules: modules });

    // Load existing body. quill-table-better warns that setContents /
    // dangerouslyPasteHTML make tables render blank, so convert the saved HTML
    // to a delta and apply it with updateContents instead.
    if (ta.value.trim()) {
      if (hasTables) {
        var delta = quill.clipboard.convert({ html: ta.value });
        quill.updateContents(delta, Quill.sources.USER);
        quill.setSelection(delta.length(), Quill.sources.SILENT);
      } else {
        quill.clipboard.dangerouslyPasteHTML(ta.value);
      }
    }

    var csrf = document.querySelector('meta[name="csrf-token"]').content;

    // --- Image button: upload the file, then embed the returned URL. This
    // keeps the DB small (no base64) and the image is served as a static file.
    quill.getModule('toolbar').addHandler('image', function () {
      var input = document.createElement('input');
      input.type = 'file';
      input.accept = 'image/png,image/jpeg,image/gif,image/webp';
      input.onchange = function () {
        var file = input.files && input.files[0];
        if (!file) return;
        var fd = new FormData();
        fd.append('file', file);
        fetch('{{ url_for("admin.upload") }}', {
          method: 'POST', headers: { 'X-CSRFToken': csrf }, body: fd
        }).then(function (r) {
          return r.json().then(function (j) { return { ok: r.ok, body: j }; });
        }).then(function (res) {
          if (!res.ok) { alert(res.body.error || 'Upload failed.'); return; }
          var range = quill.getSelection(true);
          quill.insertEmbed(range.index, 'image', res.body.url, 'user');
          quill.setSelection(range.index + 1, 'silent');
        }).catch(function () { alert('Upload failed.'); });
      };
      input.click();
    });

    // Table resize + cell alignment are handled by quill-table-better's own
    // drag handles and floating cell menu — no extra toolbar wiring needed.

    // Switch the UI from textarea to Quill only once it's ready.
    document.body.classList.add('quill-on');

    ta.form.addEventListener('submit', function () {
      // getText() is empty for an image/table-only body, so also check for
      // embeds before treating the editor as blank (which would wipe the save).
      var hasText = quill.getText().trim().length > 0;
      var hasEmbed = quill.root.querySelector('img, table');
      if (!hasText && !hasEmbed) { ta.value = ''; return; }
      // Drop quill-table-better's transient selection nodes, then serialize
      // clean semantic HTML (not raw innerHTML, which can leak UI markup).
      if (hasTables) {
        try { quill.getModule('table-better').deleteTableTemporary(); } catch (e) {}
      }
      ta.value = quill.getSemanticHTML();
    });
  })();
</script>
{% endblock %}