{% extends "layouts/reader.njk" %}

{% block reader %}
  <div class="ms-channel">
    <header class="ms-channel__header">
      <h1>{{ channel.name }}</h1>
      <div class="ms-channel__actions">
        {% if not showRead and items.length > 0 %}
        <form action="{{ baseUrl }}/api/mark-read" method="POST" style="display: inline;">
          <input type="hidden" name="channel" value="{{ channel.uid }}">
          <input type="hidden" name="entry" value="last-read-entry">
          <button type="submit" class="button button--secondary button--small">
            {{ icon("tick") }} {{ __("microsub.reader.markAllRead") }}
          </button>
        </form>
        {% endif %}
        {% if showRead %}
        <a href="{{ baseUrl }}/channels/{{ channel.uid }}" class="button button--secondary button--small">
          {{ icon("hide") }} {{ __("microsub.reader.hideRead") }}
        </a>
        {% elif readCount > 0 %}
        <a href="{{ baseUrl }}/channels/{{ channel.uid }}?showRead=true" class="button button--secondary button--small">
          {{ icon("show") }} {{ __("microsub.reader.showRead", { count: readCount }) }}
        </a>
        {% endif %}
        <a href="{{ baseUrl }}/channels/{{ channel.uid }}/feeds" class="button button--secondary button--small">
          {{ icon("syndicate") }} {{ __("microsub.feeds.title") }}
        </a>
        <a href="{{ baseUrl }}/channels/{{ channel.uid }}/settings" class="button button--secondary button--small">
          {{ icon("updatePost") }} {{ __("microsub.channels.settings") }}
        </a>
      </div>
    </header>

    {% if items.length > 0 %}
    <div class="ms-timeline" id="timeline" data-channel="{{ channel.uid }}">
      {% for item in items %}
      {% include "partials/item-card.njk" %}
      {% endfor %}
    </div>

    {% if paging %}
    <nav class="ms-timeline__paging" aria-label="Pagination">
      {% if paging.before %}
      <a href="?before={{ paging.before }}{% if showRead %}&showRead=true{% endif %}" class="button button--secondary">
        {{ icon("previous") }} {{ __("microsub.reader.newer") }}
      </a>
      {% else %}
      <span></span>
      {% endif %}
      {% if paging.after %}
      <a href="?after={{ paging.after }}{% if showRead %}&showRead=true{% endif %}" class="button button--secondary">
        {{ __("microsub.reader.older") }} {{ icon("next") }}
      </a>
      {% endif %}
    </nav>
    {% endif %}
    {% else %}
    <div class="ms-reader__empty">
      {% if readCount > 0 and not showRead %}
      {{ icon("tick") }}
      <p>{{ __("microsub.reader.allRead") }}</p>
      <a href="{{ baseUrl }}/channels/{{ channel.uid }}?showRead=true" class="button button--secondary">
        {{ icon("show") }} {{ __("microsub.reader.showRead", { count: readCount }) }}
      </a>
      {% else %}
      {{ icon("syndicate") }}
      <p>{{ __("microsub.timeline.empty") }}</p>
      <a href="{{ baseUrl }}/channels/{{ channel.uid }}/feeds" class="button button--primary">
        {{ __("microsub.feeds.subscribe") }}
      </a>
      {% endif %}
    </div>
    {% endif %}
  </div>

  <script type="module">
    // Keyboard navigation (j/k for items, o to open)
    const timeline = document.getElementById('timeline');
    if (timeline) {
      const items = Array.from(timeline.querySelectorAll('.ms-item-card'));
      let currentIndex = -1;

      function focusItem(index) {
        if (items[currentIndex]) {
          items[currentIndex].classList.remove('ms-item-card--focused');
        }
        currentIndex = Math.max(0, Math.min(index, items.length - 1));
        if (items[currentIndex]) {
          items[currentIndex].classList.add('ms-item-card--focused');
          items[currentIndex].scrollIntoView({ behavior: 'smooth', block: 'center' });
        }
      }

      document.addEventListener('keydown', (e) => {
        if (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA') return;

        switch(e.key) {
          case 'j':
            e.preventDefault();
            focusItem(currentIndex + 1);
            break;
          case 'k':
            e.preventDefault();
            focusItem(currentIndex - 1);
            break;
          case 'o':
          case 'Enter':
            e.preventDefault();
            if (items[currentIndex]) {
              const link = items[currentIndex].querySelector('.ms-item-card__link');
              if (link) link.click();
            }
            break;
        }
      });

      // Handle individual mark-read buttons
      const channelUid = timeline.dataset.channel;
      // Microsub API is at the parent of /reader (e.g., /microsub not /microsub/reader)
      const microsubApiUrl = '{{ baseUrl }}'.replace(/\/reader$/, '');

      timeline.addEventListener('click', async (e) => {
        const button = e.target.closest('.ms-item-actions__mark-read');
        if (!button) return;

        e.preventDefault();
        e.stopPropagation();

        const itemId = button.dataset.itemId;
        if (!itemId) return;

        // Disable button while processing
        button.disabled = true;

        try {
          const formData = new URLSearchParams();
          formData.append('action', 'timeline');
          formData.append('method', 'mark_read');
          formData.append('channel', channelUid);
          formData.append('entry', itemId);

          const response = await fetch(microsubApiUrl, {
            method: 'POST',
            headers: {
              'Content-Type': 'application/x-www-form-urlencoded',
            },
            body: formData.toString(),
            credentials: 'same-origin'
          });

          if (response.ok) {
            // Hide the item with animation
            const card = button.closest('.ms-item-card');
            if (card) {
              card.style.transition = 'opacity 0.3s ease, transform 0.3s ease';
              card.style.opacity = '0';
              card.style.transform = 'translateX(-20px)';
              setTimeout(() => {
                card.remove();
                // Check if timeline is now empty
                if (timeline.querySelectorAll('.ms-item-card').length === 0) {
                  location.reload();
                }
              }, 300);
            }
          } else {
            console.error('Failed to mark item as read');
            button.disabled = false;
          }
        } catch (error) {
          console.error('Error marking item as read:', error);
          button.disabled = false;
        }
      });

      // Handle caret toggle for mark-source-read popover
      timeline.addEventListener('click', (e) => {
        const caret = e.target.closest('.ms-item-actions__mark-read-caret');
        if (!caret) return;

        e.preventDefault();
        e.stopPropagation();

        // Close other open popovers
        for (const p of timeline.querySelectorAll('.ms-item-actions__mark-read-popover:not([hidden])')) {
          if (p !== caret.nextElementSibling) p.hidden = true;
        }

        const popover = caret.nextElementSibling;
        if (popover) popover.hidden = !popover.hidden;
      });

      // Handle mark-source-read button
      timeline.addEventListener('click', async (e) => {
        const button = e.target.closest('.ms-item-actions__mark-source-read');
        if (!button) return;

        e.preventDefault();
        e.stopPropagation();

        const feedId = button.dataset.feedId;
        if (!feedId) return;

        button.disabled = true;

        try {
          const formData = new URLSearchParams();
          formData.append('action', 'timeline');
          formData.append('method', 'mark_read_source');
          formData.append('channel', channelUid);
          formData.append('feed', feedId);

          const response = await fetch(microsubApiUrl, {
            method: 'POST',
            headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
            body: formData.toString(),
            credentials: 'same-origin'
          });

          if (response.ok) {
            // Animate out all cards from this feed
            const cards = timeline.querySelectorAll(`.ms-item-card[data-feed-id="${feedId}"]`);
            for (const card of cards) {
              card.style.transition = 'opacity 0.3s ease, transform 0.3s ease';
              card.style.opacity = '0';
              card.style.transform = 'translateX(-20px)';
            }
            setTimeout(() => {
              for (const card of [...cards]) {
                card.remove();
              }
              if (timeline.querySelectorAll('.ms-item-card').length === 0) {
                location.reload();
              }
            }, 300);
          } else {
            button.disabled = false;
          }
        } catch (error) {
          console.error('Error marking source as read:', error);
          button.disabled = false;
        }
      });

      // Close popovers on outside click
      document.addEventListener('click', (e) => {
        if (!e.target.closest('.ms-item-actions__mark-read-group')) {
          for (const p of timeline.querySelectorAll('.ms-item-actions__mark-read-popover:not([hidden])')) {
            p.hidden = true;
          }
        }
      });

      // Handle save-for-later buttons
      timeline.addEventListener('click', async (e) => {
        const button = e.target.closest('.ms-item-actions__save-later');
        if (!button) return;

        e.preventDefault();
        e.stopPropagation();

        const url = button.dataset.url;
        const title = button.dataset.title;
        if (!url) return;

        button.disabled = true;

        try {
          const response = await fetch('/readlater/save', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ url, title: title || url, source: 'microsub' }),
            credentials: 'same-origin'
          });

          if (response.ok) {
            button.classList.add('ms-item-actions__save-later--saved');
            button.title = 'Saved';
          } else {
            button.disabled = false;
          }
        } catch {
          button.disabled = false;
        }
      });
    }
  </script>
{% endblock %}