{{define "content"}}
<form id="settingsForm" onsubmit="saveSettings(event)">

  <section class="panel">
    <h2>Copy Sources</h2>
    <div class="panel-body">
      <div class="form-hint">Select top-level folders or expand branches and choose individual nested directories.</div>
    </div>
    <div class="source-list">
      <div class="source-tree" id="sourceTree">
        <div class="text-muted source-tree-empty">Loading...</div>
      </div>
    </div>
    <div class="btn-row">
      <button type="button" class="button-secondary button-sm" onclick="reloadSourceTree()">Refresh list</button>
    </div>
  </section>

  <section class="panel">
    <h2>Copy Settings</h2>
    <div class="form-body">

      <div class="form-group">
        <label class="form-label" for="reserveGB">Reserved free space on disk (GB)</label>
        <input class="form-input" type="number" id="reserveGB" min="0" max="1000" step="0.5" value="2">
        <span class="form-hint">Copying will stop when free space falls below this value.</span>
      </div>

      <div class="form-group">
        <label class="form-label" for="fileSelectMode">Files to copy</label>
        <select class="form-select" id="fileSelectMode" style="width:auto;max-width:420px">
          <option value="new">Only new files not copied to this disk before</option>
          <option value="all">All matching files</option>
        </select>
        <span class="form-hint">The new-only mode skips files already copied to this disk, even if they were later removed.</span>
      </div>

      <div class="form-group">
        <label class="form-label" for="destFolder">Destination folder on disk</label>
        <input class="form-input" type="text" id="destFolder" placeholder="media" style="width:200px">
        <span class="form-hint">Files will be copied into this subfolder while preserving the selected source structure. The disk root and <code>.jukebox</code> are never allowed here.</span>
      </div>

      <div class="form-group">
        <label class="form-label" for="overwriteMode">Default write mode</label>
        <select class="form-select" id="overwriteMode" style="width:auto;max-width:420px">
          <option value="skip">Keep existing files</option>
          <option value="delete">Replace destination folder contents</option>
        </select>
        <span class="form-hint">This is used for automatic copy runs. Manual dashboard actions can override it.</span>
      </div>

    </div>
  </section>

  <section class="panel">
    <h2>Automation</h2>
    <div class="form-body">
      <div class="form-group">
        <label style="display:flex;align-items:center;gap:8px;cursor:pointer">
          <input type="checkbox" id="autoCopy" style="width:15px;height:15px;accent-color:var(--accent)">
          <span class="form-label" style="margin:0">Automatic copy</span>
        </label>
        <span class="form-hint">Start copying automatically when a known disk is detected.</span>
      </div>
    </div>
  </section>

  <div style="display:flex;gap:8px;margin-bottom:24px">
    <button type="submit" class="button-primary">Save settings</button>
    <button type="button" class="button-secondary" onclick="loadSettings()">Reset</button>
  </div>

</form>

<script>
const sourceTree = new Map();
const expandedNodes = new Set();
const loadingNodes = new Set();
let sourceConfig = {};

function escapeHTML(value) {
  return String(value || '').replace(/[&<>"']/g, (char) => ({
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#39;'
  }[char]));
}

function pathDepth(path) {
  return path ? path.split('/').length : 0;
}

function parentPath(path) {
  if (!path || !path.includes('/')) return '';
  return path.slice(0, path.lastIndexOf('/'));
}

function effectiveSourceState(path) {
  let current = path;
  while (true) {
    if (Object.prototype.hasOwnProperty.call(sourceConfig, current)) {
      return sourceConfig[current];
    }
    if (!current) return true;
    current = parentPath(current);
  }
}

function collectSourcesForSave() {
  const items = [];
  const seen = new Set();
  const roots = sourceTree.get('') || [];

  for (const item of roots) {
    items.push({ path: item.path, enabled: effectiveSourceState(item.path) });
    seen.add(item.path);
  }

  Object.entries(sourceConfig).forEach(([path, enabled]) => {
    if (seen.has(path)) return;
    items.push({ path, enabled });
  });

  return items.sort((a, b) => a.path.localeCompare(b.path));
}

async function loadSourceChildren(path = '') {
  if (loadingNodes.has(path)) return;
  loadingNodes.add(path);
  renderSources();

  try {
    const query = path ? '?path=' + encodeURIComponent(path) : '';
    const response = await fetch('/api/sources' + query);
    if (!response.ok) return;
    const payload = await response.json();
    sourceTree.set(path, payload.items || []);
  } catch (error) {
  } finally {
    loadingNodes.delete(path);
    renderSources();
  }
}

async function ensureExpanded(path) {
  expandedNodes.add(path);
  if (!sourceTree.has(path)) {
    await loadSourceChildren(path);
    return;
  }
  renderSources();
}

function toggleSource(path, checked) {
  sourceConfig[path] = checked;
  renderSources();
}

function renderSourceNodes(parent = '') {
  const items = sourceTree.get(parent) || [];
  return items.map((item) => {
    const checked = effectiveSourceState(item.path);
    const expanded = expandedNodes.has(item.path);
    const childrenKnown = sourceTree.has(item.path);
    const children = childrenKnown ? sourceTree.get(item.path) : [];
    const hasChildren = !childrenKnown || children.length > 0;
    const pad = 16 + pathDepth(item.path) * 20;

    return `
      <div class="source-node">
        <div class="source-row" style="padding-left:${pad}px">
          <button
            type="button"
            class="source-toggle ${hasChildren ? '' : 'source-toggle-empty'}"
            data-action="toggle-expand"
            data-path="${escapeHTML(item.path)}"
            ${hasChildren ? '' : 'tabindex="-1" aria-hidden="true"'}
          >${expanded ? '▾' : '▸'}</button>
          <input class="source-check" type="checkbox" data-action="toggle-check" data-path="${escapeHTML(item.path)}" ${checked ? 'checked' : ''}>
          <div class="source-label">
            <span class="source-item-name">${escapeHTML(item.name)}</span>
            <span class="source-item-path">/media/${escapeHTML(item.path)}</span>
          </div>
        </div>
        ${expanded && loadingNodes.has(item.path) ? '<div class="source-loading">Loading...</div>' : ''}
        ${expanded && childrenKnown && children.length ? `<div class="source-children">${renderSourceNodes(item.path)}</div>` : ''}
      </div>
    `;
  }).join('');
}

function renderSources() {
  const el = document.getElementById('sourceTree');
  const roots = sourceTree.get('');

  if (loadingNodes.has('') && !roots) {
    el.innerHTML = '<div class="text-muted source-tree-empty">Loading...</div>';
    return;
  }
  if (!roots || !roots.length) {
    el.innerHTML = '<div class="text-muted source-tree-empty">No folders found in /media.</div>';
    return;
  }

  el.innerHTML = renderSourceNodes('');
}

async function reloadSourceTree() {
  sourceTree.clear();
  expandedNodes.clear();
  await loadSourceChildren('');
}

async function loadSettings() {
  try {
    const r = await fetch('/api/config');
    if (!r.ok) return;
    const cfg = await r.json();
    document.getElementById('reserveGB').value      = cfg.reserve_free_gb ?? 2;
    document.getElementById('destFolder').value     = cfg.dest_folder || 'media';
    document.getElementById('fileSelectMode').value = cfg.file_select_mode || 'new';
    document.getElementById('overwriteMode').value  = cfg.overwrite_mode || 'skip';
    document.getElementById('autoCopy').checked     = !!cfg.auto_copy;

    sourceConfig = {};
    (cfg.sources || []).forEach((source) => {
      sourceConfig[source.path] = !!source.enabled;
    });
    renderSources();
  } catch (error) {}
}

async function saveSettings(event) {
  event.preventDefault();

  const body = {
    reserve_free_gb:  parseFloat(document.getElementById('reserveGB').value) || 2,
    dest_folder:      document.getElementById('destFolder').value.trim() || 'media',
    file_select_mode: document.getElementById('fileSelectMode').value,
    overwrite_mode:   document.getElementById('overwriteMode').value,
    auto_copy:        document.getElementById('autoCopy').checked,
    sources:          collectSourcesForSave(),
  };

  try {
    const response = await fetch('/api/config', {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
    });
    if (response.ok) {
      toast('Settings saved', 'ok');
      await loadSettings();
      return;
    }
    const payload = await response.json();
    toast(payload.error || 'Failed to save settings', 'error');
  } catch (error) {
    toast('Network error', 'error');
  }
}

document.getElementById('sourceTree').addEventListener('click', async (event) => {
  const button = event.target.closest('[data-action="toggle-expand"]');
  if (!button) return;

  const path = button.dataset.path;
  if (expandedNodes.has(path)) {
    expandedNodes.delete(path);
    renderSources();
    return;
  }
  await ensureExpanded(path);
});

document.getElementById('sourceTree').addEventListener('change', (event) => {
  const checkbox = event.target.closest('[data-action="toggle-check"]');
  if (!checkbox) return;
  toggleSource(checkbox.dataset.path, checkbox.checked);
});

loadSettings();
loadSourceChildren('');
</script>
{{end}}