{# ── Unified Header (Notion-inspired breadcrumb navigation) ──
   Parameters available in calling context:
     breadcrumb_items: list of {label, url, id, icon, menu} — last item = current page
     page_icon: str — emoji icon
     page_title: str — fallback current-page label when no breadcrumb_items
     right_actions: str — raw HTML for right-side action buttons
     hamburger_click: str — Alpine expression for hamburger button
     hide_hamburger: bool — if truthy, hides the hamburger button
     hide_home: bool — if truthy, do not prepend the "Home" crumb
     nav_workspace_id: int — workspace id used to fetch the navigation menu
     nav_page_id: int — current page id (enables the sibling nav menu)
#}
{% set ns = namespace(items=[]) %}
{% if not hide_home %}
  {% set ns.items = ns.items + [{"label": "Home", "url": "/workspaces", "id": none, "icon": "🏠", "menu": false, "home": true}] %}
{% endif %}
{% if breadcrumb_items %}
  {% for item in breadcrumb_items %}
    {% set ns.items = ns.items + [{
        "label": item.get('label') or item.get('name') or 'Untitled',
        "url": item.get('url'),
        "id": item.get('id'),
        "icon": item.get('icon'),
        "menu": (item.get('id') is not none)
    }] %}
  {% endfor %}
{% elif page_title %}
  {% set ns.items = ns.items + [{
      "label": page_title,
      "url": none,
      "id": nav_page_id if nav_page_id is defined else none,
      "icon": page_icon if page_icon is defined else none,
      "menu": (nav_page_id is defined and nav_page_id)
  }] %}
{% endif %}
<header class="topbar unified-header">
  {% if not hide_hamburger %}
  <button class="hamburger-btn"
          @click="{{ hamburger_click|default('sidebarCollapsed ? (sidebarCollapsed = false) : (mobileSidebarOpen = true, sidebarCollapsed = false)') }}"
          title="Toggle sidebar">
    <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
      <line x1="3" y1="6" x2="21" y2="6"/>
      <line x1="3" y1="12" x2="21" y2="12"/>
      <line x1="3" y1="18" x2="21" y2="18"/>
    </svg>
  </button>
  {% endif %}

  <script type="application/json" id="fd-breadcrumb-data">{{ {"workspace_id": nav_workspace_id|default(0), "crumbs": ns.items}|tojson }}</script>

  <div class="topbar-left header-breadcrumb" x-data="fdBreadcrumb()" x-init="init()"
       @mouseleave="dragCloseTimer()">
    {% if page_icon %}
    <span class="header-page-icon">{{ page_icon }}</span>
    {% endif %}

    <template x-for="(crumb, di) in display" :key="di">
      <span class="crumb-cell">
        {# ── Collapsed "…" segment ── #}
        <template x-if="crumb.ellipsis">
          <span class="crumb-anchor"
                @mouseenter="cancelCloseTimer(); ellipsisOpen = true"
                @mouseleave="dragCloseTimer()">
            <button type="button" class="breadcrumb-link crumb-ellipsis">&hellip;</button>
            <div class="fd-nav-menu" x-show="ellipsisOpen" x-cloak x-transition.opacity
                 @mouseenter="cancelCloseTimer()"
                 @mouseleave="dragCloseTimer()">
              <template x-for="h in crumb.hidden" :key="h.id">
                <div class="fd-nav-item" @click.stop="go(h.url); closeAll()">
                  <span class="fd-nav-ico" x-text="h.icon || '📄'"></span>
                  <span class="fd-nav-label" x-text="h.label"></span>
                </div>
              </template>
            </div>
          </span>
        </template>

        {# ── Plain link crumb (Home / non-menu with url) ── #}
        <template x-if="!crumb.ellipsis && !crumb.menu && crumb.url">
          <a class="breadcrumb-link" :href="crumb.url" x-text="crumb.label"
             @mouseenter="closeAll()"></a>
        </template>

        {# ── Plain current crumb (no menu, no url) ── #}
        <template x-if="!crumb.ellipsis && !crumb.menu && !crumb.url">
          <span class="breadcrumb-current" x-text="crumb.label"
                @mouseenter="closeAll()"></span>
        </template>

        {# ── Interactive crumb with navigation dropdown (Notion-style hover) ── #}
        <template x-if="!crumb.ellipsis && crumb.menu">
          <span class="crumb-anchor"
                @mouseenter="cancelCloseTimer(); openMenu(crumb.origIndex)"
                @mouseleave="dragCloseTimer()">
            <button type="button" class="breadcrumb-link"
                    :class="{ 'breadcrumb-current': crumb.origIndex === crumbs.length - 1 }"
                    x-text="crumb.label"></button>
            <div class="fd-nav-menu"
                 x-show="openIdx === crumb.origIndex" x-cloak x-transition.opacity
                 @mouseenter="cancelCloseTimer()"
                 @mouseleave="dragCloseTimer()">
              <div class="fd-nav-section" x-text="crumb.home ? 'Workspaces' : 'Private'"></div>
              <template x-if="loading">
                <div class="fd-nav-empty">Loading&hellip;</div>
              </template>
              <template x-if="!loading && activeItems.length === 0">
                <div class="fd-nav-empty">No pages</div>
              </template>
              <template x-for="item in activeItems" :key="item.id">
                <div class="fd-nav-item"
                     @mouseenter="openSub(item)"
                     @click.stop="go(item.url); closeAll()">
                  <span class="fd-nav-ico" x-text="item.icon || '📄'"></span>
                  <span class="fd-nav-label" x-text="item.name"></span>
                  <span class="fd-nav-arrow" x-show="item.has_children">&rsaquo;</span>
                  <div class="fd-nav-menu fd-nav-submenu" x-show="subOpenId === item.id" x-cloak
                       @mouseenter="cancelCloseTimer()"
                       @mouseleave="dragCloseTimer()">
                    <template x-for="s in subItems" :key="s.id">
                      <div class="fd-nav-item" @click.stop="go(s.url); closeAll()">
                        <span class="fd-nav-ico" x-text="s.icon || '📄'"></span>
                        <span class="fd-nav-label" x-text="s.name"></span>
                        <span class="fd-nav-arrow" x-show="s.has_children">&rsaquo;</span>
                      </div>
                    </template>
                  </div>
                </div>
              </template>
            </div>
          </span>
        </template>

        <span class="breadcrumb-sep" x-show="di < display.length - 1">/</span>
      </span>
    </template>
  </div>

  <div class="topbar-right header-actions">
    {{ right_actions|safe if right_actions else '' }}
  </div>
</header>

<script>
document.addEventListener('alpine:init', function () {
  if (window.Alpine && window.Alpine.__fdBreadcrumbRegistered) return;
  if (window.Alpine) window.Alpine.__fdBreadcrumbRegistered = true;
  Alpine.data('fdBreadcrumb', function () {
    return {
      crumbs: [],
      wsId: 0,
      openIdx: null,
      ellipsisOpen: false,
      loading: false,
      cache: {},
      activeItems: [],
      subOpenId: null,
      subItems: [],
      closeTimer: null,

      init: function () {
        var el = document.getElementById('fd-breadcrumb-data');
        if (el) {
          try {
            var d = JSON.parse(el.textContent);
            this.crumbs = (d.crumbs || []).map(function (c, i) { c.origIndex = i; return c; });
            this.wsId = d.workspace_id || 0;
          } catch (e) { this.crumbs = []; }
        }
      },

      get display() {
        var c = this.crumbs;
        if (c.length <= 4) return c;
        var head = [c[0], c[1]];
        var hidden = c.slice(2, c.length - 2);
        var tail = [c[c.length - 2], c[c.length - 1]];
        return head.concat([{ ellipsis: true, hidden: hidden }], tail);
      },

      parentIdFor: function (origIndex) {
        if (origIndex <= 0) return null;
        var prev = this.crumbs[origIndex - 1];
        return prev && prev.id ? prev.id : null;
      },

      fetchMenu: function (parentId) {
        var key = parentId == null ? 'root' : String(parentId);
        var self = this;
        if (this.cache[key]) return Promise.resolve(this.cache[key]);
        var url = '/api/nav/menu?';
        if (this.wsId) url += 'workspace_id=' + this.wsId + '&';
        if (parentId != null) url += 'parent_id=' + parentId;
        return fetch(url, { credentials: 'same-origin' })
          .then(function (r) { return r.json(); })
          .then(function (d) { self.cache[key] = d.items || []; return self.cache[key]; })
          .catch(function () { return []; });
      },

      openMenu: function (origIndex) {
        if (this.openIdx === origIndex) return; // already open
        var self = this;
        // Close sub first
        this.subOpenId = null;
        this.subItems = [];
        this.openIdx = origIndex;
        this.loading = true;
        this.fetchMenu(this.parentIdFor(origIndex)).then(function (items) {
          if (self.openIdx === origIndex) { self.activeItems = items; }
          self.loading = false;
        });
      },

      openSub: function (item) {
        var self = this;
        if (!item.has_children) { this.subOpenId = null; this.subItems = []; return; }
        if (this.subOpenId === item.id) return;
        this.subOpenId = item.id;
        this.subItems = [];
        this.fetchMenu(item.id).then(function (items) {
          if (self.subOpenId === item.id) { self.subItems = items; }
        });
      },

      // ── Hover close timer ──
      dragCloseTimer: function () {
        var self = this;
        this.cancelCloseTimer();
        this.closeTimer = setTimeout(function () {
          self.closeAll();
        }, 200);
      },

      cancelCloseTimer: function () {
        if (this.closeTimer) {
          clearTimeout(this.closeTimer);
          this.closeTimer = null;
        }
      },

      closeAll: function () {
        this.cancelCloseTimer();
        this.openIdx = null;
        this.ellipsisOpen = false;
        this.subOpenId = null;
        this.subItems = [];
        this.activeItems = [];
      },

      go: function (url) { if (url) window.location.href = url; }
    };
  });
});
</script>