def calculate_combined_progress(project_name, manifest_data):
    """Calculates the combined progress based on scada/drawing status for a project."""
    print(f"[{project_name}] Calculating combined progress statistics...")
    results = {
        "overall": {
            "total_csv": 0, "found_both": 0, "found_scada_only": 0, "found_drawing_only": 0, "missing_both": 0,
            "percentage_found_both": 0,
            "missing_list": [], "found_scada_only_list": [], "found_drawing_only_list": [], "found_both_list": []
        },
        "panels": {}
    }
    if not manifest_data:
        print("Warning: No manifest data to calculate progress from.")
        return results # Return the empty structure

    results["overall"]["total_csv"] = len(manifest_data)

    for item in manifest_data:
        panel = item.get('control_panel', 'Unknown Panel') # Use get with default

        # Initialize panel data if not present
        if panel not in results["panels"]:
             results["panels"][panel] = {
                 "total": 0, "found_both": 0, "found_scada_only": 0, "found_drawing_only": 0, "missing_both": 0,
                 "percentage_found_both": 0,
                 "missing_list": [], "found_scada_only_list": [], "found_drawing_only_list": [], "found_both_list": []
             }

        results["panels"][panel]["total"] += 1

        # Categorize and add to lists
        # Create a copy of the item detail to avoid modifying the original if needed later
        # Exclude 'normalized_alias' from the output dictionary
        item_detail = {k: v for k, v in item.items() if k != 'normalized_alias'}

        found_scada = item.get('found_scada', False)
        found_drawing = item.get('found_drawing', False)

        if found_scada and found_drawing:
            category = "found_both"
        elif found_scada and not found_drawing:
            category = "found_scada_only"
        elif not found_scada and found_drawing:
            category = "found_drawing_only"
        else: # Missing both
            category = "missing_both"

        results["overall"][category] += 1
        results["panels"][panel][category] += 1
        # Correct the list keys used for appending
        if category == "missing_both":
            results["overall"]["missing_list"].append(item_detail)
            results["panels"][panel]["missing_list"].append(item_detail)
        else:
            results["overall"][f"{category}_list"].append(item_detail)
            results["panels"][panel][f"{category}_list"].append(item_detail)


    # Calculate percentages
    if results["overall"]["total_csv"] > 0:
        results["overall"]["percentage_found_both"] = round(
            (results["overall"]["found_both"] / results["overall"]["total_csv"]) * 100, 1
        )
    for panel_data in results["panels"].values():
        if panel_data["total"] > 0:
            panel_data["percentage_found_both"] = round(
                (panel_data["found_both"] / panel_data["total"]) * 100, 1
            )

    print("Combined progress calculation finished.")
    # print(json.dumps(results, indent=2)) # DEBUG: Print structure if needed
    return results