app_logic.py

import os
import re
import tempfile
import shutil
import git
from huggingface_hub import (
    create_repo,
    upload_folder,
    list_repo_files,
    # delete_file, # Not used in the provided code, can be removed if not planned
    Repository,
    whoami,
)
import logging
from pathlib import Path

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Function to parse markdown input
def parse_markdown(markdown_input):
    """Parse markdown input to extract space details and file structure."""
    # This function remains largely the same as its file parsing logic wasn't flagged as an issue,
    # only its space name/owner extraction's usage.
    space_info = {"repo_name_md": "", "owner_md": "", "files": []} # Renamed keys for clarity
    current_file = None
    file_content = []
    in_file_content = False

    lines = markdown_input.strip().split("\n")
    for line in lines:
        # Extract space name from markdown (for informational purposes, not for repo_id creation)
        if line.startswith("# Space:"):
            full_space_name_md = line.replace("# Space:", "").strip()
            if "/" in full_space_name_md:
                space_info["owner_md"], space_info["repo_name_md"] = full_space_name_md.split("/", 1)
            else:
                space_info["repo_name_md"] = full_space_name_md
        # Detect file structure section
        elif line.startswith("## File Structure"):
            continue
        # Detect file in structure (this part seems less used if "### File:" is primary)
        elif line.startswith("📄") or line.startswith("📁"):
            if current_file and file_content: # If content was being collected for a previous file (e.g. under "### File:")
                space_info["files"].append({"path": current_file, "content": "\n".join(file_content)})
            elif current_file and not file_content: # Path defined by 📄 but no content under a ### File: block
                 # This case implies an empty file if no ### File: section follows for it.
                 # Or, this line could be ignored if ### File: is the true source.
                 # For now, let's assume 📄 just lists a file, content comes from ### File:
                 pass # current_file is updated, but content collection relies on ### File: or ```

            current_file = line[2:].strip() # Update current file path from 📄 or 📁
            file_content = [] # Reset content for this new file context
            in_file_content = False # Content for 📄 files is typically defined by subsequent ### File: blocks
        # Detect file content section
        elif line.startswith("### File:"):
            if current_file and file_content: # Save content of the previous file
                space_info["files"].append({"path": current_file, "content": "\n".join(file_content)})
            
            current_file = line.replace("### File:", "").strip()
            file_content = [] # Reset for new file
            in_file_content = True # Start collecting content lines
        # Handle file content (inside ``` blocks or plain text lines)
        elif in_file_content and line.strip().startswith("```"): # Code block fences
            if file_content and line.strip() == "```": # Closing fence ```
                # Current file_content is the content of the code block
                space_info["files"].append({"path": current_file, "content": "\n".join(file_content)})
                file_content = []
                in_file_content = False # End of this file's content block
                current_file = None # Reset current file, expect new ### File: or 📄
            elif not file_content and line.strip().startswith("```"): # Opening fence ``` or ```lang
                # This line itself is the start of the content if it's like ```python
                file_content.append(line) 
                # in_file_content remains true
            else: # Mid-block line that happens to be ```, treat as content
                 file_content.append(line)
        elif in_file_content:
            file_content.append(line)

    # Append the last file's content if any
    if current_file and file_content:
        space_info["files"].append({"path": current_file, "content": "\n".join(file_content)})
    
    # Filter out any entries that might have been added with no path (shouldn't happen with current logic)
    space_info["files"] = [f for f in space_info["files"] if f.get("path")]
    return space_info

def _determine_repo_id(api_token, space_name_ui, owner_ui):
    """
    Determines the final owner and constructs the repo_id.
    space_name_ui should be just the name, not 'owner/name'.
    owner_ui is the value from the UI's owner field.
    Returns (repo_id, error_message)
    """
    if not space_name_ui:
        return None, "Error: Space Name cannot be empty."
    if "/" in space_name_ui:
        return None, "Error: Space Name should not contain '/'. Please use the Owner field for the namespace."

    final_owner = owner_ui
    error_message = None

    if not final_owner: # If UI owner field is empty
        if not api_token:
            return None, "Error: API token is required to automatically determine owner when Owner field is empty."
        try:
            user_info = whoami(token=api_token)
            if user_info and 'name' in user_info:
                final_owner = user_info['name']
            else:
                logger.error(f"whoami(token=...) returned: {user_info} when trying to determine owner.")
                error_message = "Error: Could not retrieve username from API token. Ensure token is valid and has 'Read profile' permissions. Or, specify Owner manually."
        except Exception as e:
            logger.error(f"Error calling whoami for owner: {str(e)}")
            error_message = f"Error retrieving username from API token: {str(e)}. Please specify Owner manually."
        
        if error_message:
            return None, error_message

    if not final_owner: 
        return None, "Error: Owner could not be determined. Please provide an owner or ensure your API token is valid."

    return f"{final_owner}/{space_name_ui}", None

# Function to create and populate a Space
def create_space(api_token, space_name_ui, owner_ui, sdk_ui, markdown_input):
    """Create a Hugging Face Space and populate it with files from markdown input."""
    try:
        if not api_token:
            return "Error: Please provide a valid Hugging Face API token."

        repo_id, err = _determine_repo_id(api_token, space_name_ui, owner_ui)
        if err:
            return err
        
        # Parse markdown input for file structure
        # The space_info["repo_name_md"] and space_info["owner_md"] are NOT used for repo_id creation.
        space_info = parse_markdown(markdown_input)
        if not space_info["files"]:
            return "Error: No files found in the markdown input. Ensure '### File: path/to/file.ext' markers are used."

        # Create temporary directory
        with tempfile.TemporaryDirectory() as temp_dir:
            # Use a generic name for the local repo dir, not space_name_ui, to avoid issues if space_name_ui has special chars
            # Or, ensure space_name_ui is filesystem-safe. For simplicity, let's use a fixed name.
            repo_local_path = os.path.join(temp_dir, "repo") 
            os.makedirs(repo_local_path, exist_ok=True)

            # Write files to temporary directory
            for file_info in space_info["files"]:
                if not file_info.get("path"):
                    logger.warning(f"Skipping file with no path: {file_info}")
                    continue
                file_path_abs = Path(repo_local_path) / file_info["path"]
                file_path_abs.parent.mkdir(parents=True, exist_ok=True)
                with open(file_path_abs, "w", encoding="utf-8") as f:
                    f.write(file_info["content"])
                logger.info(f"Wrote file: {file_path_abs}")

            # Create repository on Hugging Face
            try:
                create_repo(
                    repo_id=repo_id,
                    token=api_token,
                    repo_type="space",
                    space_sdk=sdk_ui,
                    private=False, # Or make this an option
                )
                logger.info(f"Created Space: {repo_id}")
            except Exception as e:
                if "already exists" in str(e).lower() or "you already created this repo" in str(e).lower() :
                    logger.info(f"Space {repo_id} already exists, proceeding to update/upload.")
                else:
                    return f"Error creating Space '{repo_id}': {str(e)}"

            # Initialize Git repository (optional but good practice before upload_folder if it relies on it)
            # repo_git = git.Repo.init(repo_local_path)
            # repo_git.git.add(all=True)
            # try:
            #     repo_git.index.commit("Initial commit from Space Builder")
            # except git.exc.GitCommandError as e:
            #     if "nothing to commit" in str(e):
            #         logger.info("No changes to commit locally.")
            #     else:
            #         raise e
            
            # Push to Hugging Face Space
            # upload_folder handles its own commit if the folder is not already a git repo or has uncommitted changes.
            upload_folder(
                repo_id=repo_id,
                folder_path=repo_local_path, # path to the directory containing files
                path_in_repo=".",      # path where files should be uploaded within the repo
                token=api_token,
                commit_message=f"Initial Space setup of {repo_id}",
            )

            return f"Successfully created/updated Space: [{repo_id}](https://huggingface.co/spaces/{repo_id})"

    except Exception as e:
        logger.error(f"Error in create_space: {str(e)}")
        return f"Error: {str(e)}"

# Function to view Space files
def view_space_files(api_token, space_name_ui, owner_ui):
    """List files in a Hugging Face Space."""
    try:
        if not api_token:
            return "Error: Please provide a valid Hugging Face API token."
        
        repo_id, err = _determine_repo_id(api_token, space_name_ui, owner_ui)
        if err:
            return err
            
        files = list_repo_files(repo_id=repo_id, token=api_token, repo_type="space")
        if files:
            return f"Files in `{repo_id}`:\n\n" + "\n".join([f"- `{f}`" for f in files])
        else:
            return f"No files found in the Space `{repo_id}`."
    except Exception as e:
        logger.error(f"Error in view_space_files: {str(e)}")
        return f"Error listing files for `{repo_id or (owner_ui + '/' + space_name_ui if owner_ui else space_name_ui)}`: {str(e)}"

# Function to update a Space file
def update_space_file(api_token, space_name_ui, owner_ui, file_path_in_repo, file_content, commit_message_ui):
    """Update a file in a Hugging Face Space with a commit."""
    try:
        if not api_token:
            return "Error: Please provide a valid Hugging Face API token."

        repo_id, err = _determine_repo_id(api_token, space_name_ui, owner_ui)
        if err:
            return err
        
        if not file_path_in_repo:
            return "Error: File Path cannot be empty."
        if not commit_message_ui:
            commit_message_ui = f"Update {file_path_in_repo} via Space Builder"

        # Create temporary directory for cloning
        with tempfile.TemporaryDirectory() as temp_dir:
            repo_local_clone_path = Path(temp_dir) / "cloned_repo" # Use a fixed name for cloned repo dir
            
            # Clone the specific space
            cloned_repo = Repository(
                local_dir=repo_local_clone_path,
                clone_from=f"https://huggingface.co/spaces/{repo_id}",
                repo_type="space",
                use_auth_token=api_token,
                git_user="Space Builder Bot", # Optional: Git committer info
                git_email="[email protected]" # Optional
            )

            # Write updated file
            full_local_file_path = cloned_repo.local_dir / file_path_in_repo
            full_local_file_path.parent.mkdir(parents=True, exist_ok=True)
            with open(full_local_file_path, "w", encoding="utf-8") as f:
                f.write(file_content)

            # Commit and push changes
            # The Repository object automatically handles staging changes from the local_dir.
            cloned_repo.push_to_hub(commit_message=commit_message_ui)
            
            return f"Successfully updated `{file_path_in_repo}` in Space [{repo_id}](https://huggingface.co/spaces/{repo_id})"

    except Exception as e:
        logger.error(f"Error in update_space_file: {str(e)}")
        return f"Error updating file for `{repo_id or (owner_ui + '/' + space_name_ui if owner_ui else space_name_ui)}`: {str(e)}"