{% extends "base.html" %}
{% load i18n %}

{% block title %}{% trans "Course Calendar" %}{% endblock %}

{% block extra_js %}
<script src="https://cdn.jsdelivr.net/npm/fullcalendar@6.1.20/index.global.min.js" integrity="sha256-sQEgS6I+FEeOlX4oTVi7qW/HMRAh0O6vifpeZXIMRsg=" crossorigin="anonymous"></script>
<script>
  function showModal(occurrenceId) {
    // get event's url
    const eventApiUrl = `/api/calendar/occurrences/${occurrenceId}`;

    const eventApi = fetch(eventApiUrl)
      .then(response => response.json())
      .then(data => {
        eventUrl = `/occurrence/${occurrenceId}/`;

        const modal = document.createElement('div');
        modal.classList.add('fixed', 'inset-0', 'flex', 'items-center', 'justify-center', 'z-50', 'shadow-lg', 'overflow-auto');
        modal.style.backgroundColor = 'rgba(0, 0, 0, 0.5)'; // semi-transparent background

        const modalContent = document.createElement('div');
        modalContent.classList.add('bg-white', 'rounded-lg', 'p-6', 'max-w-3xl', 'relative', 'overflow-auto', 'max-h-[80vh]');
        modalContent.innerHTML = '<p class="text-gray-500">{% trans "Loading..." %}</p>';

        if (eventUrl) {
          fetch(eventUrl)
            .then(response => response.text())
            .then(html => {
              modalContent.innerHTML = html;
            })
            .catch(error => {
              modalContent.innerHTML = '<p class="text-red-500">Failed to load event details.</p>';
            });

          modal.appendChild(modalContent);
          document.body.appendChild(modal);

          // Close modal when clicking outside modalContent
          modal.addEventListener('click', function(e) {
            if (e.target === modal) {
              document.body.removeChild(modal);

              // remove ?modal=occurrenceId from the url
              const url = new URL(window.location);
              url.searchParams.delete('modal');
              window.history.pushState({}, '', url);
            }
          });

          // Close modal on ESC key
          document.addEventListener('keydown', function escHandler(e) {
            if (e.key === 'Escape') {
              if (document.body.contains(modal)) {
                document.body.removeChild(modal);
              }
              document.removeEventListener('keydown', escHandler);
              // remove ?modal=occurrenceId from the url
              const url = new URL(window.location);
              url.searchParams.delete('modal');
              window.history.pushState({}, '', url);
            }
          });

          const closeButton = document.createElement('button');
          closeButton.classList.add('absolute', 'top-2', 'right-2', 'text-red-500', 'cursor-pointer', 'hover:text-gray-700', 'text-5xl', 'translate-x-[-50%]');
          closeButton.innerHTML = '&times;';
          closeButton.addEventListener('click', function() {
            if (document.body.contains(modal)) {
              document.body.removeChild(modal);
            }
            // remove ?modal=occurrenceId from the url
            const url = new URL(window.location);
            url.searchParams.delete('modal');
            window.history.pushState({}, '', url);
          });
          modal.appendChild(closeButton);

          // add ?modal=occurrenceId to the url
          const url = new URL(window.location);
          url.searchParams.set('modal', occurrenceId);
          window.history.pushState({}, '', url);
        }
        return data;
      })
      .catch(error => {
        console.error('Error fetching event details:', error);
        return null;
      });
  }

  // if ?modal=event_id is in the url, open the modal for that event
  const urlParams = new URLSearchParams(window.location.search);
  const modalEventId = urlParams.get('modal');
  if (modalEventId) {
    showModal(modalEventId);
  }

  document.addEventListener('DOMContentLoaded', function() {
    var calendarEl = document.getElementById('calendar');
    var calendar = new FullCalendar.Calendar(calendarEl, {
      height: "auto",
      initialView: 'timeGridWeek',
      firstDay: 1,
      nowIndicator: true,
      views: {
        timeGridWeek: {
          titleFormat: { month: 'long', year: 'numeric' },
          slotLabelFormat: { hour: '2-digit', minute: '2-digit' },
          slotMinTime: '08:00:00',
          slotMaxTime: '22:00:00',
        },
        listWeek: {
          titleFormat: { month: 'long', year: 'numeric' },
          listDaySideFormat: false,
        },
      },
      headerToolbar: {
        left: 'prev,next today',
        center: 'title',
        right: 'timeGridWeek,listMonth',
      },
      locale: "{% get_current_language as LANGUAGE_CODE %}{{ LANGUAGE_CODE }}",
      events: "/api/calendar/occurrences/",
      eventClick: function(info) {
        // prevent default navigation
        info.jsEvent.preventDefault();
        const eventUrl = info.event.url;
        if (eventUrl) {
          showModal(info.event.id);
        }
      },
    });
    calendar.render();

  });
</script>
{% endblock %}

{% block content %}
<div class="overflow-auto">
  <div id="calendar" class="min-w-xl"></div>
</div>
{% endblock %}