feat: Enhance calendar display and event management

- Improve event display: Show only the first two events for each day
  in the calendar, with a "+X more" link to show the rest.
- Add event details modal:  Allows viewing and deleting events.
- Enhance event creation modal: Improve user experience and add color
  selection for events.
- Improve year view: Show the number of events for each month.
- Improve day view: Display all day events separately.
- Improve styling and layout: Enhance the visual appeal and
  responsiveness of the calendar.

actix_mvc_app/src/views/calendar/index.html

@@ -92,8 +92,9 @@
                         <tr>
                             {% for day_idx in range(start=0, end=7) %}
                             {% set idx = week * 7 + day_idx %}
-                            <td class="calendar-day" onclick="openEventModalForDate(this)" {% if idx <
+                            <td class="calendar-day {% if idx < calendar_days|length and calendar_days[idx].events|length > 2 %}has-more-events{% endif %}"
-                                calendar_days|length %} data-day="{{ calendar_days[idx].day }}"
+                                onclick="openEventModalForDate(this)" {% if idx < calendar_days|length %}
+                                data-day="{{ calendar_days[idx].day }}"
                                 data-is-current-month="{{ calendar_days[idx].is_current_month }}"
                                 data-date="{{ current_year }}-{{ current_month|format_hour }}-{{ calendar_days[idx].day|format_hour }}"
                                 {% else %} data-day="0" data-is-current-month="false" data-date="" {% endif %}>
@@ -111,14 +112,24 @@
                                     {% if day.events|length > 0 %}
                                     <div class="calendar-events">
                                         {% for event in day.events %}
-                                        {% if loop.index <= 2 %} <div class="event-preview text-truncate mb-1"
+                                        <div class="event-preview text-truncate mb-1 {% if loop.index > 2 %}d-none{% endif %}"
-                                            style="background-color: {{ event.color }}; color: white;">
+                                            style="background-color: {{ event.color }}; color: white;"
+                                            onclick="openEventDetails(event, '{{ event.id }}', '{{ event.title|escape }}', '{{ event.description|escape }}', '{{ event.color }}', {{ event.all_day }}, '{{ event.start_time }}', '{{ event.end_time }}')"
+                                            data-event-id="{{ event.id }}" data-event-title="{{ event.title|escape }}"
+                                            data-event-description="{{ event.description|escape }}"
+                                            data-event-color="{{ event.color }}"
+                                            data-event-all-day="{{ event.all_day }}"
+                                            data-event-start="{{ event.start_time }}"
+                                            data-event-end="{{ event.end_time }}" data-event-index="{{ loop.index }}"
+                                            title="{{ event.title|escape }}">
                                             {{ event.title }}
                                         </div>
-                                    {% endif %}
                                         {% endfor %}
                                         {% if day.events|length > 2 %}
-                                    <div class="small text-muted text-center">+{{ day.events|length - 2 }} more</div>
+                                        <div class="small text-muted text-center more-events-link"
+                                            onclick="showMoreEventsForDay(event, '{{ current_year }}-{{ current_month|format_hour }}-{{ day.day|format_hour }}')">
+                                            +{{ day.events|length - 2 }} more
+                                        </div>
                                         {% endif %}
                                     </div>
                                     {% endif %}
@@ -190,7 +201,8 @@
             {% if events is defined and events|length > 0 %}
             {% for event in events %}
             {% if event.all_day %}
-        <div class="alert" style="background-color: {{ event.color }}; color: white;">
+            <div class="alert" style="background-color: {{ event.color }}; color: white; cursor: pointer;"
+                onclick="openEventDetails(event, '{{ event.id }}', '{{ event.title|escape }}', '{{ event.description|escape }}', '{{ event.color }}', {{ event.all_day }}, '{{ event.start_time }}', '{{ event.end_time }}')">
                 <h5>{{ event.title }}</h5>
                 <p>{{ event.description }}</p>
             </div>
@@ -215,7 +227,8 @@
                     {% if not event.all_day %}
                     {% set start_hour = event.start_time|extract_hour %}
                     {% if start_hour == hour|string %}
-                <div class="alert mb-2" style="background-color: {{ event.color }}; color: white;">
+                    <div class="alert mb-2" style="background-color: {{ event.color }}; color: white; cursor: pointer;"
+                        onclick="openEventDetails(event, '{{ event.id }}', '{{ event.title|escape }}', '{{ event.description|escape }}', '{{ event.color }}', {{ event.all_day }}, '{{ event.start_time }}', '{{ event.end_time }}')">
                         <h5>{{ event.title }}</h5>
                         <p>{{ event.start_time|format_time }} - {{ event.end_time|format_time }}</p>
                         <p>{{ event.description }}</p>
@@ -297,7 +310,8 @@
                             <div class="col-md-6">
                                 <div class="mb-3">
                                     <label for="endTime" class="form-label">End Time *</label>
-                                <input type="datetime-local" class="form-control" id="endTime" name="end_time" required>
+                                    <input type="datetime-local" class="form-control" id="endTime" name="end_time"
+                                        required>
                                 </div>
                             </div>
                         </div>
@@ -313,6 +327,89 @@
         </div>
     </div>
 
+    <!-- Event Details Modal (Read-only) -->
+    <div class="modal fade" id="eventDetailsModal" tabindex="-1" aria-labelledby="eventDetailsModalLabel"
+        aria-hidden="true">
+        <div class="modal-dialog modal-lg">
+            <div class="modal-content">
+                <div class="modal-header bg-info text-white">
+                    <h5 class="modal-title" id="eventDetailsModalLabel">
+                        <i class="bi bi-calendar-event"></i> Event Details
+                    </h5>
+                    <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"
+                        aria-label="Close"></button>
+                </div>
+                <div class="modal-body">
+                    <div class="row">
+                        <div class="col-md-8">
+                            <div class="mb-3">
+                                <label class="form-label fw-bold">Event Title</label>
+                                <div class="form-control-plaintext border rounded p-2 bg-light" id="detailsEventTitle">
+                                </div>
+                            </div>
+                        </div>
+                        <div class="col-md-4">
+                            <div class="mb-3">
+                                <label class="form-label fw-bold">Color</label>
+                                <div class="d-flex align-items-center">
+                                    <div id="detailsEventColorBox" class="me-2"
+                                        style="width: 20px; height: 20px; border-radius: 3px;"></div>
+                                    <span id="detailsEventColor" class="form-control-plaintext"></span>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+
+                    <div class="mb-3">
+                        <label class="form-label fw-bold">Description</label>
+                        <div class="form-control-plaintext border rounded p-2 bg-light" id="detailsEventDescription"
+                            style="min-height: 80px;"></div>
+                    </div>
+
+                    <div class="mb-3">
+                        <div class="form-check">
+                            <input type="checkbox" class="form-check-input" id="detailsAllDayEvent" disabled>
+                            <label class="form-check-label fw-bold" for="detailsAllDayEvent">All Day Event</label>
+                        </div>
+                    </div>
+
+                    <div class="row" id="detailsTimeInputs">
+                        <div class="col-md-6">
+                            <div class="mb-3">
+                                <label class="form-label fw-bold">Start Time</label>
+                                <div class="form-control-plaintext border rounded p-2 bg-light" id="detailsStartTime">
+                                </div>
+                            </div>
+                        </div>
+                        <div class="col-md-6">
+                            <div class="mb-3">
+                                <label class="form-label fw-bold">End Time</label>
+                                <div class="form-control-plaintext border rounded p-2 bg-light" id="detailsEndTime">
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+                <div class="modal-footer">
+                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
+                    <button type="button" class="btn btn-danger" id="deleteEventBtn" onclick="deleteCurrentEvent()">
+                        <i class="bi bi-trash"></i> Delete Event
+                    </button>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <!-- Events Popup for "+X more" -->
+    <div id="eventsPopup" class="position-absolute bg-white border rounded shadow-lg p-3"
+        style="display: none; z-index: 1050; min-width: 250px; max-width: 300px;">
+        <div class="d-flex justify-content-between align-items-center mb-2">
+            <h6 class="mb-0 fw-bold">Events</h6>
+            <button type="button" class="btn-close btn-sm" onclick="closeEventsPopup()"></button>
+        </div>
+        <div id="eventsPopupContent"></div>
+    </div>
+
     <!-- Floating Action Button (FAB) for mobile -->
     <button type="button" class="d-md-none position-fixed bottom-0 end-0 m-4 btn btn-primary rounded-circle shadow"
         onclick="openEventModal()"
@@ -326,6 +423,10 @@
 <style>
     .calendar-table {
         border: 2px solid #dee2e6;
+        width: 100%;
+        table-layout: fixed;
+        /* Fixed table layout for consistent column widths */
+        border-collapse: collapse;
     }
 
     .calendar-table td {
@@ -343,9 +444,20 @@
     }
 
     .calendar-day {
+        height: 120px;
         min-height: 120px;
+        max-height: 120px;
+        width: 14.28%;
+        /* Fixed width for 7 columns */
         position: relative;
-        padding: 30px !important;
+        padding: 8px !important;
+        overflow: hidden;
+        /* Prevent content from stretching the cell */
+        box-sizing: border-box;
+        vertical-align: top;
+        border: 1px solid #dee2e6;
+        cursor: pointer;
+        transition: background-color 0.2s;
     }
 
     .calendar-day-header {
@@ -360,6 +472,16 @@
         text-align: center;
     }
 
+    .calendar-events {
+        max-height: 70px;
+        /* Fixed height for events container */
+        overflow-y: auto;
+        /* Scroll if too many events */
+        overflow-x: hidden;
+        margin-top: 4px;
+        text-align: left;
+    }
+
     .calendar-day[data-is-current-month="true"]:hover::after {
         content: "Click to add event";
         position: absolute;
@@ -373,6 +495,12 @@
         font-size: 0.7rem;
         white-space: nowrap;
         z-index: 10;
+        transition: opacity 0.2s;
+    }
+
+    /* Hide hint when cell has "+X more" link */
+    .calendar-day.has-more-events:hover::after {
+        display: none;
     }
 
     .calendar-day[data-is-current-month="false"] {
@@ -391,9 +519,7 @@
         font-weight: 900;
     }
 
-    .calendar-events {
+
-        text-align: left;
-    }
 
     .event-preview {
         font-size: 0.7rem;
@@ -403,6 +529,14 @@
         cursor: pointer;
         transition: opacity 0.2s;
         font-weight: 500;
+        /* Limit text length and prevent calendar stretching */
+        max-width: 100%;
+        overflow: hidden;
+        white-space: nowrap;
+        text-overflow: ellipsis;
+        word-break: break-all;
+        /* Ensure consistent width */
+        box-sizing: border-box;
     }
 
     .event-preview:hover {
@@ -421,6 +555,48 @@
         opacity: 0.7;
         margin-top: 0.5rem;
     }
+
+    /* Events popup styles */
+    #eventsPopup {
+        border: 1px solid #dee2e6;
+        background: white;
+        box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
+    }
+
+    .popup-event-item {
+        font-size: 0.8rem;
+        padding: 6px 8px;
+        margin: 2px 0;
+        border-radius: 3px;
+        cursor: pointer;
+        transition: opacity 0.2s;
+        font-weight: 500;
+        color: white;
+    }
+
+    .popup-event-item:hover {
+        opacity: 0.8;
+        transform: translateX(2px);
+    }
+
+    .more-events-link {
+        cursor: pointer;
+        transition: color 0.2s;
+    }
+
+    .more-events-link:hover {
+        color: #0056b3 !important;
+        text-decoration: underline;
+    }
+
+    /* Dark theme support for popup */
+    @media (prefers-color-scheme: dark) {
+        #eventsPopup {
+            background: #2d3748;
+            border-color: #4a5568;
+            color: white;
+        }
+    }
 </style>
 {% endblock %}
 
@@ -454,9 +630,9 @@
     });
 
     // Handle form submission (ensure only one listener)
+    if (!window.calendarFormInitialized) {
+        window.calendarFormInitialized = true;
         const eventForm = document.getElementById('newEventForm');
-    if (!eventForm.hasAttribute('data-listener-added')) {
-        eventForm.setAttribute('data-listener-added', 'true');
         eventForm.addEventListener('submit', function (e) {
             e.preventDefault();
 
@@ -554,9 +730,162 @@
                 alert('Network error creating event. Please try again.');
             });
         });
+
+        // Global variable to store current event ID for deletion
+        window.currentEventId = null;
     }
 
-    // Delete event function
+    // Open event details modal
+    function openEventDetails(clickEvent, eventId, title, description, color, allDay, startTime, endTime) {
+        // Prevent event bubbling to calendar day click
+        clickEvent.stopPropagation();
+
+        // Store event ID for potential deletion
+        window.currentEventId = eventId;
+
+        // Populate modal fields
+        document.getElementById('detailsEventTitle').textContent = title;
+        document.getElementById('detailsEventDescription').textContent = description || 'No description';
+        document.getElementById('detailsEventColorBox').style.backgroundColor = color;
+        document.getElementById('detailsEventColor').textContent = getColorName(color);
+        document.getElementById('detailsAllDayEvent').checked = allDay;
+
+        // Format and display times
+        if (allDay) {
+            document.getElementById('detailsTimeInputs').style.display = 'none';
+        } else {
+            document.getElementById('detailsTimeInputs').style.display = 'block';
+            document.getElementById('detailsStartTime').textContent = formatDateTime(startTime);
+            document.getElementById('detailsEndTime').textContent = formatDateTime(endTime);
+        }
+
+        // Show modal
+        const modal = new bootstrap.Modal(document.getElementById('eventDetailsModal'));
+        modal.show();
+    }
+
+    // Show more events popup for a specific day
+    function showMoreEventsForDay(clickEvent, dateStr) {
+        // Prevent event bubbling to calendar day click
+        clickEvent.stopPropagation();
+
+        const popup = document.getElementById('eventsPopup');
+        const content = document.getElementById('eventsPopupContent');
+
+        // Clear previous content
+        content.innerHTML = '';
+
+        // Find the calendar day cell for this date
+        const dayCell = document.querySelector(`[data-date="${dateStr}"]`);
+        if (!dayCell) return;
+
+        // Get all event elements from this day (including hidden ones)
+        const eventElements = dayCell.querySelectorAll('.event-preview');
+        const allEvents = Array.from(eventElements).map(el => ({
+            id: el.getAttribute('data-event-id'),
+            title: el.getAttribute('data-event-title'),
+            description: el.getAttribute('data-event-description'),
+            color: el.getAttribute('data-event-color'),
+            all_day: el.getAttribute('data-event-all-day') === 'true',
+            start_time: el.getAttribute('data-event-start'),
+            end_time: el.getAttribute('data-event-end'),
+            index: parseInt(el.getAttribute('data-event-index'))
+        }));
+
+        // Show only the hidden events (index > 2)
+        const hiddenEvents = allEvents.filter(event => event.index > 2);
+
+        hiddenEvents.forEach(event => {
+            const eventDiv = document.createElement('div');
+            eventDiv.className = 'popup-event-item text-truncate';
+            eventDiv.style.backgroundColor = event.color;
+
+            // Truncate title to 30 characters
+            const truncatedTitle = event.title.length > 30 ? event.title.substring(0, 27) + '...' : event.title;
+            eventDiv.textContent = truncatedTitle;
+            eventDiv.title = event.title; // Show full title on hover
+
+            eventDiv.onclick = (e) => {
+                e.stopPropagation();
+                closeEventsPopup();
+                openEventDetails(e, event.id, event.title, event.description, event.color, event.all_day, event.start_time, event.end_time);
+            };
+            content.appendChild(eventDiv);
+        });
+
+        // Position popup near the clicked element
+        const rect = clickEvent.target.getBoundingClientRect();
+        popup.style.left = (rect.left + window.scrollX) + 'px';
+        popup.style.top = (rect.bottom + window.scrollY + 5) + 'px';
+        popup.style.display = 'block';
+
+        // Close popup when clicking outside
+        setTimeout(() => {
+            document.addEventListener('click', closeEventsPopupOnOutsideClick);
+        }, 100);
+    }
+
+    // Close events popup
+    function closeEventsPopup() {
+        document.getElementById('eventsPopup').style.display = 'none';
+        document.removeEventListener('click', closeEventsPopupOnOutsideClick);
+    }
+
+    // Close popup when clicking outside
+    function closeEventsPopupOnOutsideClick(event) {
+        const popup = document.getElementById('eventsPopup');
+        if (!popup.contains(event.target)) {
+            closeEventsPopup();
+        }
+    }
+
+    // Delete current event
+    function deleteCurrentEvent() {
+        if (!window.currentEventId) return;
+
+        if (confirm('Are you sure you want to delete this event?')) {
+            fetch(`/calendar/events/${window.currentEventId}/delete`, {
+                method: 'POST'
+            }).then(response => {
+                if (response.ok) {
+                    window.location.reload();
+                } else {
+                    alert('Error deleting event. Please try again.');
+                }
+            }).catch(error => {
+                console.error('Error:', error);
+                alert('Error deleting event. Please try again.');
+            });
+        }
+    }
+
+    // Helper function to get color name
+    function getColorName(colorCode) {
+        const colorMap = {
+            '#4285F4': 'Blue',
+            '#EA4335': 'Red',
+            '#34A853': 'Green',
+            '#FBBC05': 'Yellow',
+            '#A142F4': 'Purple',
+            '#24C1E0': 'Cyan'
+        };
+        return colorMap[colorCode] || 'Custom';
+    }
+
+    // Helper function to format date/time
+    function formatDateTime(dateTimeStr) {
+        const date = new Date(dateTimeStr);
+        return date.toLocaleString('en-US', {
+            weekday: 'short',
+            year: 'numeric',
+            month: 'short',
+            day: 'numeric',
+            hour: '2-digit',
+            minute: '2-digit'
+        });
+    }
+
+    // Delete event function (legacy - keeping for compatibility)
     function deleteEvent(eventId) {
         if (confirm('Are you sure you want to delete this event?')) {
             fetch(`/calendar/events/${eventId}/delete`, {
@@ -719,8 +1048,22 @@
         bootstrapModal.show();
     }
 
+    // Truncate event titles to prevent calendar stretching
+    function truncateEventTitles() {
+        const eventElements = document.querySelectorAll('.event-preview');
+        eventElements.forEach(element => {
+            const originalTitle = element.textContent.trim();
+            if (originalTitle.length > 30) {
+                element.textContent = originalTitle.substring(0, 27) + '...';
+            }
+        });
+    }
+
     // Initialize calendar features
     function initializeCalendar() {
+        // Truncate long event titles
+        truncateEventTitles();
+
         // Highlight today's date
         const today = new Date();
         const todayStr = today.toISOString().split('T')[0];