from pdf2image import convert_from_path
import os
import shutil

class PdfManager:
    def __init__(self):
        # Use relative paths for Hugging Face Spaces compatibility
        # Get the directory where the main application file is located
        app_dir = os.path.dirname(os.path.abspath(__file__))
        
        # Use /tmp for Hugging Face Spaces, fallback to relative path
        if os.path.exists("/tmp") and os.access("/tmp", os.W_OK):
            self.base_output_dir = "/tmp/pages"
            print(f"✅ Using /tmp directory for Hugging Face Spaces: {self.base_output_dir}")
        else:
            # Fallback to relative path from app directory
            self.base_output_dir = os.path.join(app_dir, "pages")
            print(f"✅ Using relative path: {self.base_output_dir}")
        
        # Ensure the base directory exists
        os.makedirs(self.base_output_dir, exist_ok=True)
        
    def clear_and_recreate_dir(self, output_folder):
        
        print(f"Clearing output folder {output_folder}")

        if os.path.exists(output_folder):
            shutil.rmtree(output_folder)
            #print("Clearing is unused for now for persistency")
        else:
            os.makedirs(output_folder)
        
        #print("Clearing is unused for now for persistency")

    def save_images(self, id, pdf_path, max_pages, pages: list[int] = None) -> list[str]:
        # Use absolute path for Hugging Face Spaces compatibility
        output_folder = os.path.join(self.base_output_dir, id)
        images = convert_from_path(pdf_path)

        print(f"Saving images from {pdf_path} to {output_folder}. Max pages: {max_pages}")

        self.clear_and_recreate_dir(output_folder) 

        num_page_processed = 0

        for i, image in enumerate(images):
            if max_pages and num_page_processed >= max_pages:
                break

            if pages and i not in pages:
                continue

            full_save_path = os.path.join(output_folder, f"page_{i + 1}.png")

            #print(f"Saving image to {full_save_path}")

            image.save(full_save_path, "PNG")

            num_page_processed += 1

        return [os.path.join(output_folder, f"page_{i + 1}.png") for i in range(num_page_processed)]