Sort library tab, background saving

pyPhotoAlbum/mixins/operations/file_ops.py

@@ -26,7 +26,7 @@ from pyPhotoAlbum.decorators import ribbon_action, numerical_input
 from pyPhotoAlbum.project import Project, Page
 from pyPhotoAlbum.async_project_loader import AsyncProjectLoader
 from pyPhotoAlbum.loading_widget import LoadingWidget
-from pyPhotoAlbum.project_serializer import save_to_zip
+from pyPhotoAlbum.project_serializer import save_to_zip, save_to_zip_async
 from pyPhotoAlbum.models import set_asset_resolution_context
 from pyPhotoAlbum.version_manager import format_version_info, CURRENT_DATA_VERSION
 from pyPhotoAlbum.asset_heal_dialog import AssetHealDialog
@@ -275,7 +275,7 @@ class FileOperationsMixin:
 
     @ribbon_action(label="Save", tooltip="Save the current project", tab="Home", group="File", shortcut="Ctrl+S")
     def save_project(self):
-        """Save the current project"""
+        """Save the current project asynchronously with progress feedback"""
         # If project has a file path, use it; otherwise prompt for location
         file_path = self.project.file_path if hasattr(self.project, "file_path") and self.project.file_path else None
 
@@ -287,8 +287,25 @@ class FileOperationsMixin:
         if file_path:
             print(f"Saving project to: {file_path}")
 
-            # Save project to ZIP
-            success, error = save_to_zip(self.project, file_path)
+            # Create loading widget if not exists
+            if not hasattr(self, "_loading_widget"):
+                self._loading_widget = LoadingWidget(self)
+
+            # Show loading widget
+            self._loading_widget.show_loading("Saving project...")
+
+            # Define callbacks for async save
+            def on_progress(progress: int, message: str):
+                """Update progress display"""
+                if hasattr(self, "_loading_widget"):
+                    self._loading_widget.set_progress(progress, 100)
+                    self._loading_widget.set_status(message)
+
+            def on_complete(success: bool, error: str):
+                """Handle save completion"""
+                # Hide loading widget
+                if hasattr(self, "_loading_widget"):
+                    self._loading_widget.hide_loading()
 
                 if success:
                     self.project.file_path = file_path
@@ -298,8 +315,20 @@ class FileOperationsMixin:
                 else:
                     error_msg = f"Failed to save project: {error}"
                     self.show_status(error_msg)
+                    self.show_error("Save Failed", error_msg)
                     print(error_msg)
 
+            # Start async save
+            save_to_zip_async(
+                self.project,
+                file_path,
+                on_complete=on_complete,
+                on_progress=on_progress
+            )
+
+            # Show immediate feedback
+            self.show_status("Saving project in background...", 2000)
+
     @ribbon_action(label="Heal Assets", tooltip="Reconnect missing image assets", tab="Home", group="File")
     def heal_assets(self):
         """Open the asset healing dialog to reconnect missing images"""

pyPhotoAlbum/project_serializer.py

@@ -7,7 +7,8 @@ import json
 import zipfile
 import shutil
 import tempfile
-from typing import Optional, Tuple
+import threading
+from typing import Optional, Tuple, Callable
 from pathlib import Path
 from pyPhotoAlbum.project import Project
 from pyPhotoAlbum.version_manager import (
@@ -171,6 +172,155 @@ def save_to_zip(project: Project, zip_path: str) -> Tuple[bool, Optional[str]]:
         return False, error_msg
 
 
+def save_to_zip_async(
+    project: Project,
+    zip_path: str,
+    on_complete: Optional[Callable[[bool, Optional[str]], None]] = None,
+    on_progress: Optional[Callable[[int, str], None]] = None,
+) -> threading.Thread:
+    """
+    Save a project to a ZIP file asynchronously in a background thread.
+
+    This provides instant UI responsiveness by:
+    1. Immediately serializing project.json to a temp folder (fast)
+    2. Creating the ZIP file in a background thread (slow)
+    3. Calling on_complete when done
+
+    Args:
+        project: The Project instance to save
+        zip_path: Path where the ZIP file should be created
+        on_complete: Optional callback(success: bool, error_msg: Optional[str])
+                    called when save completes
+        on_progress: Optional callback(progress: int, message: str) where
+                    progress is 0-100 and message describes current step
+
+    Returns:
+        The background thread (already started)
+    """
+    def _background_save():
+        """Background thread function to create the ZIP file."""
+        temp_dir = None
+        try:
+            # Report progress: Starting
+            if on_progress:
+                on_progress(0, "Preparing to save...")
+
+            # Ensure .ppz extension
+            final_zip_path = zip_path
+            if not final_zip_path.lower().endswith(".ppz"):
+                final_zip_path += ".ppz"
+
+            # Check for and import any external images before saving
+            if on_progress:
+                on_progress(5, "Checking for external images...")
+            _import_external_images(project)
+
+            # Serialize project to dictionary
+            if on_progress:
+                on_progress(10, "Serializing project data...")
+            project_data = project.serialize()
+
+            # Add version information
+            project_data["serialization_version"] = SERIALIZATION_VERSION
+            project_data["data_version"] = CURRENT_DATA_VERSION
+
+            # Create a temporary directory for staging
+            if on_progress:
+                on_progress(15, "Creating temporary staging area...")
+            temp_dir = tempfile.mkdtemp(prefix="pyPhotoAlbum_save_")
+
+            # Write project.json to temp directory
+            if on_progress:
+                on_progress(20, "Writing project metadata...")
+            temp_project_json = os.path.join(temp_dir, "project.json")
+            with open(temp_project_json, "w") as f:
+                json.dump(project_data, f, indent=2, sort_keys=True)
+
+            # Create temp ZIP file (not final location - for atomic write)
+            temp_zip_path = os.path.join(temp_dir, "project.ppz")
+
+            # Count assets for progress reporting
+            assets_folder = project.asset_manager.assets_folder
+            total_files = 1  # project.json
+            asset_files = []
+            if os.path.exists(assets_folder):
+                for root, dirs, files in os.walk(assets_folder):
+                    for file in files:
+                        asset_files.append((root, file))
+                        total_files += 1
+
+            if on_progress:
+                on_progress(25, f"Creating ZIP archive ({total_files} files)...")
+
+            # Create ZIP file in temp location
+            with zipfile.ZipFile(temp_zip_path, "w", zipfile.ZIP_DEFLATED) as zipf:
+                # Write project.json
+                zipf.write(temp_project_json, "project.json")
+
+                # Add all assets with progress reporting
+                if asset_files:
+                    # Progress from 25% to 90% for assets
+                    progress_range = 90 - 25
+                    for idx, (root, file) in enumerate(asset_files):
+                        file_path = os.path.join(root, file)
+                        arcname = os.path.relpath(file_path, project.folder_path)
+                        zipf.write(file_path, arcname)
+
+                        # Report progress every 10 files or at end
+                        if idx % 10 == 0 or idx == len(asset_files) - 1:
+                            progress = 25 + int((idx + 1) / len(asset_files) * progress_range)
+                            if on_progress:
+                                on_progress(
+                                    progress,
+                                    f"Adding assets... ({idx + 1}/{len(asset_files)})"
+                                )
+
+            # Atomic move: move temp ZIP to final location
+            if on_progress:
+                on_progress(95, "Finalizing save...")
+
+            # Ensure parent directory exists
+            os.makedirs(os.path.dirname(os.path.abspath(final_zip_path)), exist_ok=True)
+
+            # Remove old file if it exists
+            if os.path.exists(final_zip_path):
+                os.remove(final_zip_path)
+
+            # Move temp ZIP to final location (atomic on same filesystem)
+            shutil.move(temp_zip_path, final_zip_path)
+
+            if on_progress:
+                on_progress(100, "Save complete!")
+
+            print(f"Project saved to {final_zip_path}")
+
+            # Call completion callback with success
+            if on_complete:
+                on_complete(True, None)
+
+        except Exception as e:
+            error_msg = f"Error saving project: {str(e)}"
+            print(error_msg)
+
+            # Call completion callback with error
+            if on_complete:
+                on_complete(False, error_msg)
+
+        finally:
+            # Clean up temp directory
+            if temp_dir and os.path.exists(temp_dir):
+                try:
+                    shutil.rmtree(temp_dir)
+                except Exception:
+                    pass  # Ignore cleanup errors
+
+    # Start background thread
+    save_thread = threading.Thread(target=_background_save, daemon=True)
+    save_thread.start()
+
+    return save_thread
+
+
 def load_from_zip(zip_path: str, extract_to: Optional[str] = None) -> Project:
     """
     Load a project from a ZIP file.

pyPhotoAlbum/thumbnail_browser.py

@@ -7,10 +7,10 @@ from typing import Optional, List, Tuple
 
 from PyQt6.QtWidgets import (
     QWidget, QVBoxLayout, QHBoxLayout, QPushButton,
-    QLabel, QFileDialog, QDockWidget
+    QLabel, QFileDialog, QDockWidget, QScrollBar
 )
 from PyQt6.QtCore import Qt, QSize, QMimeData, QUrl, QPoint
-from PyQt6.QtGui import QDrag, QCursor
+from PyQt6.QtGui import QDrag, QCursor, QPainter, QFont, QColor
 from PyQt6.QtOpenGLWidgets import QOpenGLWidget
 
 from pyPhotoAlbum.gl_imports import *
@@ -20,6 +20,15 @@ from pyPhotoAlbum.mixins.viewport import ViewportMixin
 IMAGE_EXTENSIONS = [".jpg", ".jpeg", ".png", ".gif", ".bmp", ".tiff", ".webp"]
 
 
+class DateHeader:
+    """Represents a date separator header in the thumbnail list."""
+
+    def __init__(self, date_text: str, y_position: float):
+        self.date_text = date_text
+        self.y = y_position
+        self.height = 30.0  # Height of the header bar
+
+
 class ThumbnailItem:
     """Represents a thumbnail with position and path information."""
 
@@ -61,6 +70,7 @@ class ThumbnailGLWidget(QOpenGLWidget):
         super().__init__()
 
         self.thumbnails: List[ThumbnailItem] = []
+        self.date_headers: List[DateHeader] = []
         self.current_folder: Optional[Path] = None
 
         # Store reference to main window
@@ -74,6 +84,14 @@ class ThumbnailGLWidget(QOpenGLWidget):
         self.drag_start_pos = None
         self.dragging_thumbnail = None
 
+        # Scrollbar (created but managed by parent)
+        self.scrollbar = None
+        self._updating_scrollbar = False  # Flag to prevent circular updates
+
+        # Sort mode (set by parent dock)
+        self.sort_mode = "name"
+        self._get_image_date_func = None  # Function to get date from parent
+
         # Enable OpenGL
         self.setMinimumSize(QSize(250, 300))
 
@@ -105,6 +123,9 @@ class ThumbnailGLWidget(QOpenGLWidget):
         # Rearrange thumbnails to fit new width
         if hasattr(self, 'image_files') and self.image_files:
             self._arrange_thumbnails()
+        else:
+            # Still update scrollbar even if no thumbnails
+            self._update_scrollbar_range()
 
     def paintGL(self):
         """Render thumbnails."""
@@ -118,10 +139,42 @@ class ThumbnailGLWidget(QOpenGLWidget):
         glTranslatef(self.pan_offset[0], self.pan_offset[1], 0)
         glScalef(self.zoom_level, self.zoom_level, 1.0)
 
+        # Render date headers first (so they appear behind thumbnails)
+        for header in self.date_headers:
+            self._render_date_header(header)
+
         # Render each thumbnail (placeholders or textures)
         for thumb in self.thumbnails:
             self._render_thumbnail(thumb)
 
+    def paintEvent(self, event):
+        """Override paintEvent to add text labels after OpenGL rendering."""
+        # Call the default OpenGL paint
+        super().paintEvent(event)
+
+        # Draw text labels for date headers using QPainter
+        if self.date_headers and self.sort_mode == "date":
+            painter = QPainter(self)
+            painter.setRenderHint(QPainter.RenderHint.Antialiasing)
+
+            # Set font for date labels
+            font = QFont("Arial", 11, QFont.Weight.Bold)
+            painter.setFont(font)
+            painter.setPen(QColor(255, 255, 255))  # White text
+
+            for header in self.date_headers:
+                # Transform header position to screen coordinates
+                screen_y = header.y * self.zoom_level + self.pan_offset[1]
+                screen_h = header.height * self.zoom_level
+
+                # Only draw if header is visible
+                if screen_y + screen_h >= 0 and screen_y <= self.height():
+                    # Draw text centered vertically in the header bar
+                    text_y = int(screen_y + screen_h / 2)
+                    painter.drawText(10, text_y + 5, header.date_text)
+
+            painter.end()
+
     def _render_thumbnail(self, thumb: ThumbnailItem):
         """Render a single thumbnail using placeholder pattern."""
         x, y, w, h = thumb.get_bounds()
@@ -195,6 +248,36 @@ class ThumbnailGLWidget(QOpenGLWidget):
         glVertex2f(x, y + h)
         glEnd()
 
+    def _render_date_header(self, header: DateHeader):
+        """Render a date separator header."""
+        # Calculate full width bar
+        widget_width = self.width() / self.zoom_level
+        x = 0
+        y = header.y
+        w = widget_width
+        h = header.height
+
+        # Draw background bar (dark blue-gray)
+        glColor3f(0.3, 0.4, 0.5)
+        glBegin(GL_QUADS)
+        glVertex2f(x, y)
+        glVertex2f(x + w, y)
+        glVertex2f(x + w, y + h)
+        glVertex2f(x, y + h)
+        glEnd()
+
+        # Draw bottom border
+        glColor3f(0.2, 0.3, 0.4)
+        glLineWidth(2.0)
+        glBegin(GL_LINES)
+        glVertex2f(x, y + h)
+        glVertex2f(x + w, y + h)
+        glEnd()
+
+        # Note: Text rendering would require QPainter overlay
+        # For now, the colored bar serves as a visual separator
+        # Text will be added using QPainter in a future enhancement
+
     def _create_texture_for_thumbnail(self, thumb: ThumbnailItem):
         """Create OpenGL texture from pending PIL image."""
         if not thumb._pending_pil_image:
@@ -282,33 +365,140 @@ class ThumbnailGLWidget(QOpenGLWidget):
         # Build a map of existing thumbnails by path to reuse them
         existing_thumbs = {thumb.image_path: thumb for thumb in self.thumbnails}
 
-        # Clear list but reuse thumbnail objects
+        # Clear lists but reuse thumbnail objects
         self.thumbnails.clear()
+        self.date_headers.clear()
+
+        # For date mode: track current date and positioning
+        current_date_str = None
+        section_start_y = spacing
+        row_in_section = 0
+        col = 0
 
         for idx, image_file in enumerate(self.image_files):
-            row = idx // columns
-            col = idx % columns
             image_path = str(image_file)
 
+            # Check if we need a date header (only in date sort mode)
+            if self.sort_mode == "date" and self._get_image_date_func:
+                from datetime import datetime
+                timestamp = self._get_image_date_func(image_file)
+                date_obj = datetime.fromtimestamp(timestamp)
+                date_str = date_obj.strftime("%B %d, %Y")  # e.g., "December 13, 2025"
+
+                if date_str != current_date_str:
+                    # Starting a new date section
+                    if current_date_str is not None:
+                        # Not the first section - calculate where this section starts
+                        # It should start after the last thumbnail of the previous section
+                        if self.thumbnails:
+                            last_thumb = self.thumbnails[-1]
+                            # Start after the last row of previous section
+                            last_row_y = last_thumb.y + last_thumb.thumbnail_size
+                            section_start_y = last_row_y + spacing * 2  # Extra spacing between sections
+
+                    # Add header at section start
+                    header = DateHeader(date_str, section_start_y)
+                    self.date_headers.append(header)
+
+                    # Update section_start_y to after the header
+                    section_start_y += header.height + spacing
+
+                    current_date_str = date_str
+                    row_in_section = 0
+                    col = 0
+
+            # Calculate position
+            if self.sort_mode == "date":
+                # In date mode: position relative to section start
+                row = row_in_section
+                thumb_y = section_start_y + row * (100.0 + spacing)
+            else:
+                # In other modes: simple grid based on overall index
+                row = idx // columns
+                thumb_y = row * (100.0 + spacing) + spacing
+
+            # Calculate X position (always centered)
+            thumb_x = h_offset + col * (100.0 + spacing) + spacing
+
             # Reuse existing thumbnail if available, otherwise create new
             if image_path in existing_thumbs:
                 thumb = existing_thumbs[image_path]
-                # Update grid position
                 thumb.grid_row = row
                 thumb.grid_col = col
-                # Recalculate position with horizontal centering
-                thumb.x = h_offset + col * (thumb.thumbnail_size + spacing) + spacing
-                thumb.y = row * (thumb.thumbnail_size + spacing) + spacing
+                thumb.x = thumb_x
+                thumb.y = thumb_y
             else:
-                # Create new placeholder thumbnail with horizontal centering
+                # Create new placeholder thumbnail
                 thumb = ThumbnailItem(image_path, (row, col))
-                thumb.x = h_offset + col * (thumb.thumbnail_size + spacing) + spacing
-                thumb.y = row * (thumb.thumbnail_size + spacing) + spacing
-                # Request async load (will be skipped if already loading/loaded)
+                thumb.x = thumb_x
+                thumb.y = thumb_y
+                # Request async load
                 self._request_thumbnail_load(thumb)
 
             self.thumbnails.append(thumb)
 
+            # Update column and row counters
+            col += 1
+            if col >= columns:
+                col = 0
+                row_in_section += 1
+
+        # Update scrollbar range after arranging
+        self._update_scrollbar_range()
+
+    def _update_scrollbar_range(self):
+        """Update scrollbar range based on content height."""
+        if not self.scrollbar or self._updating_scrollbar:
+            return
+
+        if not self.thumbnails:
+            self.scrollbar.setRange(0, 0)
+            self.scrollbar.setPageStep(self.height())
+            return
+
+        # Calculate total content height
+        if self.thumbnails:
+            # Find the maximum Y position
+            max_y = max(thumb.y + thumb.thumbnail_size for thumb in self.thumbnails)
+            content_height = max_y * self.zoom_level
+        else:
+            content_height = 0
+
+        # Visible height
+        visible_height = self.height()
+
+        # Scrollable range
+        scroll_range = max(0, int(content_height - visible_height))
+
+        self._updating_scrollbar = True
+        self.scrollbar.setRange(0, scroll_range)
+        self.scrollbar.setPageStep(visible_height)
+        self.scrollbar.setSingleStep(int(visible_height / 10))  # 10% of visible height per step
+
+        # Update scrollbar position based on current pan
+        scroll_pos = int(-self.pan_offset[1])
+        self.scrollbar.setValue(scroll_pos)
+        self._updating_scrollbar = False
+
+    def _on_scrollbar_changed(self, value):
+        """Handle scrollbar value change."""
+        if self._updating_scrollbar:
+            return
+
+        # Update pan offset based on scrollbar value
+        self.pan_offset = (0, -value)
+        self.update()
+
+    def _update_scrollbar_position(self):
+        """Update scrollbar position based on current pan offset."""
+        if not self.scrollbar or self._updating_scrollbar:
+            return
+
+        self._updating_scrollbar = True
+        scroll_pos = int(-self.pan_offset[1])
+        self.scrollbar.setValue(scroll_pos)
+        self._updating_scrollbar = False
+
     def update_used_images(self):
         """Update which thumbnails are already used in the project."""
         # Get reference to main window's project
@@ -438,6 +628,7 @@ class ThumbnailGLWidget(QOpenGLWidget):
                 self.pan_offset[1] + delta.y()
             )
             self.drag_start_pos = event.pos()
+            self._update_scrollbar_position()
             self.update()
 
     def mouseReleaseEvent(self, event):
@@ -483,6 +674,7 @@ class ThumbnailGLWidget(QOpenGLWidget):
                 self.pan_offset[1] + scroll_amount
             )
 
+        self._update_scrollbar_position()
         self.update()
 
 
@@ -513,9 +705,54 @@ class ThumbnailBrowserDock(QDockWidget):
 
         layout.addLayout(header_layout)
 
+        # Sort toolbar
+        sort_layout = QHBoxLayout()
+        sort_layout.setContentsMargins(5, 0, 5, 5)
+
+        sort_label = QLabel("Sort by:")
+        sort_layout.addWidget(sort_label)
+
+        self.sort_name_btn = QPushButton("Name")
+        self.sort_name_btn.setCheckable(True)
+        self.sort_name_btn.setChecked(True)  # Default sort
+        self.sort_name_btn.clicked.connect(lambda: self._sort_by("name"))
+        sort_layout.addWidget(self.sort_name_btn)
+
+        self.sort_date_btn = QPushButton("Date")
+        self.sort_date_btn.setCheckable(True)
+        self.sort_date_btn.clicked.connect(lambda: self._sort_by("date"))
+        sort_layout.addWidget(self.sort_date_btn)
+
+        self.sort_camera_btn = QPushButton("Camera")
+        self.sort_camera_btn.setCheckable(True)
+        self.sort_camera_btn.clicked.connect(lambda: self._sort_by("camera"))
+        sort_layout.addWidget(self.sort_camera_btn)
+
+        sort_layout.addStretch()
+
+        layout.addLayout(sort_layout)
+
+        # Track current sort mode
+        self.current_sort = "name"
+
+        # Create horizontal layout for GL widget and scrollbar
+        browser_layout = QHBoxLayout()
+        browser_layout.setContentsMargins(0, 0, 0, 0)
+        browser_layout.setSpacing(0)
+
         # GL Widget for thumbnails
         self.gl_widget = ThumbnailGLWidget(main_window=parent)
-        layout.addWidget(self.gl_widget)
+        browser_layout.addWidget(self.gl_widget)
+
+        # Vertical scrollbar
+        self.scrollbar = QScrollBar(Qt.Orientation.Vertical)
+        self.scrollbar.valueChanged.connect(self.gl_widget._on_scrollbar_changed)
+        browser_layout.addWidget(self.scrollbar)
+
+        # Connect scrollbar to GL widget
+        self.gl_widget.scrollbar = self.scrollbar
+
+        layout.addLayout(browser_layout)
 
         self.setWidget(main_widget)
 
@@ -573,3 +810,96 @@ class ThumbnailBrowserDock(QDockWidget):
         """Load thumbnails from folder."""
         self.folder_label.setText(f"Folder: {folder_path.name}")
         self.gl_widget.load_folder(folder_path)
+        # Apply current sort after loading
+        self._apply_sort()
+        self.gl_widget._arrange_thumbnails()
+        self.gl_widget.update_used_images()
+        self.gl_widget.update()
+
+    def _sort_by(self, sort_mode: str):
+        """Sort thumbnails by the specified mode."""
+        # Update button states (only one can be checked)
+        self.sort_name_btn.setChecked(sort_mode == "name")
+        self.sort_date_btn.setChecked(sort_mode == "date")
+        self.sort_camera_btn.setChecked(sort_mode == "camera")
+
+        self.current_sort = sort_mode
+
+        # Re-sort the image files in the GL widget
+        if hasattr(self.gl_widget, 'image_files') and self.gl_widget.image_files:
+            self._apply_sort()
+            # Re-arrange thumbnails with new order
+            self.gl_widget._arrange_thumbnails()
+            self.gl_widget.update_used_images()
+            self.gl_widget.update()
+
+    def _apply_sort(self):
+        """Apply current sort mode to image files."""
+        if self.current_sort == "name":
+            # Sort by filename only (not full path)
+            self.gl_widget.image_files.sort(key=lambda p: p.name.lower())
+            # Clear date headers for non-date sorts
+            self.gl_widget.date_headers.clear()
+            # Reset sort mode in GL widget
+            self.gl_widget.sort_mode = "name"
+            self.gl_widget._get_image_date_func = None
+        elif self.current_sort == "date":
+            # Sort by file modification time (or EXIF date if available)
+            self.gl_widget.image_files.sort(key=self._get_image_date)
+            # Date headers will be created during _arrange_thumbnails
+            self.gl_widget.sort_mode = "date"
+            self.gl_widget._get_image_date_func = self._get_image_date
+        elif self.current_sort == "camera":
+            # Sort by camera model from EXIF
+            self.gl_widget.image_files.sort(key=self._get_camera_model)
+            # Clear date headers for non-date sorts
+            self.gl_widget.date_headers.clear()
+            # Reset sort mode in GL widget
+            self.gl_widget.sort_mode = "camera"
+            self.gl_widget._get_image_date_func = None
+
+    def _get_image_date(self, image_path: Path) -> float:
+        """Get image date from EXIF or file modification time."""
+        try:
+            from PIL import Image
+            from PIL.ExifTags import TAGS
+
+            with Image.open(image_path) as img:
+                exif = img.getexif()
+                if exif:
+                    # Look for DateTimeOriginal (when photo was taken)
+                    for tag_id, value in exif.items():
+                        tag = TAGS.get(tag_id, tag_id)
+                        if tag == "DateTimeOriginal":
+                            # Convert EXIF date format "2023:12:13 14:30:00" to timestamp
+                            from datetime import datetime
+                            try:
+                                dt = datetime.strptime(value, "%Y:%m:%d %H:%M:%S")
+                                return dt.timestamp()
+                            except:
+                                pass
+        except Exception:
+            pass
+
+        # Fallback to file modification time
+        return image_path.stat().st_mtime
+
+    def _get_camera_model(self, image_path: Path) -> str:
+        """Get camera model from EXIF metadata."""
+        try:
+            from PIL import Image
+            from PIL.ExifTags import TAGS
+
+            with Image.open(image_path) as img:
+                exif = img.getexif()
+                if exif:
+                    # Look for camera model
+                    for tag_id, value in exif.items():
+                        tag = TAGS.get(tag_id, tag_id)
+                        if tag == "Model":
+                            return str(value).strip()
+        except Exception:
+            pass
+
+        # Fallback to filename if no EXIF data
+        return image_path.name.lower()