Update app.py

app.py

@@ -144,6 +144,9 @@ def update_staging_and_manuscript(files, current_manuscript):
     text_gallery, image_gallery, pdf_gallery = [], [], []
     text_content_to_add = []
     
+    if not files:
+        return text_gallery, image_gallery, pdf_gallery, current_manuscript
+
     sorted_files = sorted(files, key=lambda x: Path(x.name).suffix)
     
     for file_obj in sorted_files:
@@ -318,7 +321,110 @@ def generate_pdfs_api(files, ai_content, layouts, fonts, num_columns, header_tex
 AVAILABLE_FONTS = register_local_fonts()
 
 def get_theme():
-    desired, fallback = "MedievalSharp", ("ui-sans-serif", "system-ui", "sans-serif")
+    """Dynamically selects a font for the theme to avoid warnings for missing fonts."""
+    desired = "MedievalSharp"
+    fallback = ("ui-sans-serif", "system-ui", "sans-serif")
     font_family = fallback
+
+    # Check if the desired font is in the list of registered fonts
     if any(desired in s for s in AVAILABLE_FONTS):
-        font_family = (gr.themes.GoogleFont(desired
+        font_family = (gr.themes.GoogleFont(desired),) + fallback
+    elif AVAILABLE_FONTS:
+        # If desired font is not found, use the first available font as a better fallback
+        first_font = AVAILABLE_FONTS[0]
+        print(f"WARNING: '{desired}' font not found. Using '{first_font}' for UI theme instead.")
+        font_family = (gr.themes.GoogleFont(first_font),) + fallback
+    else:
+        # Absolute fallback if no custom fonts are found
+        print(f"WARNING: No custom fonts found. Using system default for UI.")
+
+    return gr.themes.Base(
+        primary_hue=gr.themes.colors.purple,
+        secondary_hue=gr.themes.colors.indigo,
+        neutral_hue=gr.themes.colors.gray,
+        font=font_family
+    ).set(
+        body_background_fill="#111827",
+        body_text_color="#d1d5db",
+        button_primary_background_fill="#a855f7",
+        button_primary_text_color="#ffffff",
+        button_secondary_background_fill="#6366f1",
+        button_secondary_text_color="#ffffff",
+        block_background_fill="#1f2937",
+        block_label_background_fill="#1f2937",
+        block_title_text_color="#a855f7",
+        input_background_fill="#374151"
+    )
+
+with gr.Blocks(theme=get_theme(), title="The PDF Alchemist") as demo:
+    gr.Markdown("# ✨ The PDF Alchemist ✨")
+    gr.Markdown("A single-page grimoire to turn your ideas into beautifully crafted PDF scrolls. Use the power of AI or upload your own treasures.")
+
+    with gr.Row(equal_height=False):
+        # --- LEFT COLUMN: INPUTS & CONTROLS ---
+        with gr.Column(scale=2):
+            with gr.Group():
+                with gr.Accordion("📜 Content Crucible (Your Ingredients)", open=True):
+                    gr.Markdown("### 🤖 Command Your Idea Golem")
+                    ai_prompt = gr.Textbox(label="Incantation (Prompt)", placeholder="e.g., 'A recipe for a dragon's breath chili...'")
+                    generate_ai_btn = gr.Button("🧠 Animate Golem!")
+                    ai_content_output = gr.Textbox(label="Golem's Manuscript (Editable)", lines=10, interactive=True, value="# The Golem awaits your command!\n\n")
+                    gr.Markdown("<hr style='border-color: #374151; margin-top: 20px; margin-bottom: 20px;'>")
+                    gr.Markdown("### 📤 Add Your Physical Treasures")
+                    uploaded_files = gr.File(label="Upload Files (TXT, MD, Code, Images, PDFs)", file_count="multiple", file_types=['text', 'image', '.pdf', '.py', '.js', '.html', '.css', '.json'])
+
+            with gr.Accordion("📐 Arcane Blueprints (Layout & Structure)", open=True):
+                selected_layouts = gr.CheckboxGroup(choices=list(LAYOUTS.keys()), label="Page Layouts", value=["A4 Portrait"])
+                num_columns_slider = gr.Slider(label="Number of Text Columns", minimum=1, maximum=4, step=1, value=1)
+                header_input = gr.Textbox(label="Header Inscription", value="[Title]", placeholder="e.g., Arcane Folio - [Page #]")
+                footer_input = gr.Textbox(label="Footer Inscription", value="Page [Page #] of [Total Pages]", placeholder="e.g., Top Secret - Page [Page #]")
+
+            with gr.Accordion("💅 Stylist's Sanctum (Fonts & Margins)", open=True):
+                use_svg_engine_toggle = gr.Checkbox(label="Use SVG Emoji Engine (Vector Quality)", value=True, info="Toggle for higher quality, resolution-independent emojis. May be slower.")
+                selected_fonts = gr.CheckboxGroup(choices=AVAILABLE_FONTS, label="Fonts", value=[AVAILABLE_FONTS[0]] if AVAILABLE_FONTS else [])
+                with gr.Row():
+                    font_size_body_slider = gr.Slider(label="Body (pt)", minimum=8, maximum=16, step=1, value=10)
+                    font_size_h1_slider = gr.Slider(label="H1 (pt)", minimum=16, maximum=32, step=1, value=24)
+                with gr.Row():
+                    font_size_h2_slider = gr.Slider(label="H2 (pt)", minimum=14, maximum=28, step=1, value=18)
+                    font_size_h3_slider = gr.Slider(label="H3 (pt)", minimum=12, maximum=24, step=1, value=14)
+                with gr.Row():
+                    margin_top_slider = gr.Slider(label="Margin Top (in)", minimum=0.25, maximum=1.5, step=0.05, value=0.75)
+                    margin_bottom_slider = gr.Slider(label="Margin Bottom (in)", minimum=0.25, maximum=1.5, step=0.05, value=0.75)
+                with gr.Row():
+                    margin_left_slider = gr.Slider(label="Margin Left (in)", minimum=0.25, maximum=1.5, step=0.05, value=0.75)
+                    margin_right_slider = gr.Slider(label="Margin Right (in)", minimum=0.25, maximum=1.5, step=0.05, value=0.75)
+
+            generate_pdfs_btn = gr.Button("🔮 Alchemize PDF!", variant="primary", size="lg")
+
+        # --- RIGHT COLUMN: STAGING & OUTPUTS ---
+        with gr.Column(scale=3):
+            with gr.Group():
+                with gr.Accordion("🔍 Staging Area (Your Uploaded Treasures)", open=True):
+                    text_gallery = gr.Gallery(label="📜 Manuscripts & Code", show_label=True, columns=4, height=120, object_fit="contain")
+                    image_gallery = gr.Gallery(label="🖼️ Images & Glyphs", show_label=True, columns=4, height=120, object_fit="contain")
+                    pdf_gallery = gr.Gallery(label="📚 Imported Scrolls", show_label=True, columns=4, height=120, object_fit="contain")
+
+            with gr.Group():
+                gr.Markdown("### ⚗️ Transmuted Scrolls (Final PDFs)")
+                final_gallery_output = gr.Gallery(label="PDF Previews", show_label=False, elem_id="gallery", columns=2, height=400, object_fit="contain")
+                log_output = gr.Markdown(label="Alchemist's Log", value="Your log of successful transmutations will appear here...")
+                downloadable_files_output = gr.Files(label="Collect Your Scrolls")
+            
+    # --- API Calls & Examples ---
+    font_size_inputs = [font_size_body_slider, font_size_h1_slider, font_size_h2_slider, font_size_h3_slider]
+    margin_inputs = [margin_top_slider, margin_bottom_slider, margin_left_slider, margin_right_slider]
+    
+    uploaded_files.upload(update_staging_and_manuscript, inputs=[uploaded_files, ai_content_output], outputs=[text_gallery, image_gallery, pdf_gallery, ai_content_output])
+    generate_ai_btn.click(generate_ai_content_api, inputs=[ai_prompt], outputs=[ai_content_output])
+    
+    generate_pdfs_btn.click(generate_pdfs_api, 
+        inputs=[uploaded_files, ai_content_output, selected_layouts, selected_fonts, num_columns_slider, header_input, footer_input] + font_size_inputs + margin_inputs + [use_svg_engine_toggle], 
+        outputs=[final_gallery_output, log_output, downloadable_files_output])
+
+    gr.Examples(examples=[["A technical summary of how alchemy works"],["A short poem about a grumpy gnome"]], inputs=[ai_prompt], outputs=[ai_content_output], fn=generate_ai_content_api, cache_examples=False)
+
+if __name__ == "__main__":
+    if not EMOJI_FONT_PATH:
+        print("\n" + "="*80 + "\nCRITICAL WARNING: 'NotoColorEmoji-Regular.ttf' not found.\nThe application will fail to generate PDFs with color emojis.\n" + "="*80 + "\n")
+    demo.launch(debug=True)