import os
import shutil
import uuid
from datetime import datetime

from app.core.config import settings
from app.core.storage import StorageProvider


def generate_unique_filename(original_filename: str) -> str:
    """Generate a unique filename preserving the original extension."""
    name, ext = os.path.splitext(original_filename)
    unique_id = uuid.uuid4().hex
    return f"{unique_id}{ext}"


def get_relative_storage_path(folder: str, filename: str) -> str:
    """
    Generate a relative storage path using date-based organization.

    Example: "event-themes/2023/03/filename.jpg"
    """
    today = datetime.now()
    year_month = today.strftime("%Y/%m")
    return os.path.join(folder, year_month, filename)


def validate_image_content_type(content_type: str) -> bool:
    """Check if the content type is an allowed image type."""
    return content_type in settings.ALLOWED_IMAGE_TYPES

def _relocate_theme_file(theme_id: uuid.UUID, current_url: str, file_type: str, storage: StorageProvider) -> str:
    """
    Move an uploaded file to a theme-specific folder.

    Args:
        theme_id: The theme ID
        current_url: The current file URL
        file_type: Type of file (preview, background, etc.)
        storage: The storage provider

    Returns:
        The new URL if successful, otherwise None
    """
    try:
        # Extract the filename from the URL
        current_file = current_url.split('/files/')[1] if '/files/' in current_url else current_url
        filename = os.path.basename(current_file)

        # Define source and destination paths
        source_path = os.path.join(storage.upload_folder, current_file)
        theme_folder = os.path.join(storage.upload_folder, f'event-themes/{theme_id}/{file_type}')

        # Create the destination folder if it doesn't exist
        os.makedirs(theme_folder, exist_ok=True)

        # Define destination path
        dest_path = os.path.join(theme_folder, filename)

        # Move the file
        if os.path.exists(source_path):
            shutil.move(source_path, dest_path)

            # Return the new URL
            relative_path = os.path.relpath(dest_path, storage.upload_folder)
            return f"/files/{relative_path}"

        return None
    except Exception as e:
        print(f"Error relocating file: {str(e)}")
        return None