import logging
import os
import re
import tempfile

from huggingface_hub import HfApi, hf_hub_download
from huggingface_hub.utils import EntryNotFoundError, RepositoryNotFoundError

# Configure logging
logging.basicConfig(
    level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
)

# Files/extensions to definitely include
INCLUDE_PATTERNS = [
    ".py",
    "requirements.txt",
    "Dockerfile",
    ".js",
    ".jsx",
    ".ts",
    ".tsx",
    ".html",
    ".css",
    ".svelte",
    ".vue",
    ".json",
    ".yaml",
    ".yml",
    ".toml",
    "Procfile",
    ".sh",
]

# Files/extensions/folders to ignore
IGNORE_PATTERNS = [
    ".git",
    ".hfignore",
    "README.md",
    "LICENSE",
    "__pycache__",
    ".ipynb_checkpoints",
    ".png",
    ".jpg",
    ".jpeg",
    ".gif",
    ".svg",
    ".ico",
    ".mp3",
    ".wav",
    ".mp4",
    ".mov",
    ".avi",
    ".onnx",
    ".pt",
    ".pth",
    ".bin",
    ".safetensors",
    ".tflite",
    ".pickle",
    ".pkl",
    ".joblib",
    ".parquet",
    ".csv",
    ".tsv",
    ".zip",
    ".tar.gz",
    ".gz",
    ".ipynb",
    ".DS_Store",
    "node_modules",
]

# Regex to find potential Hugging Face model IDs (e.g., "org/model-name", "user/model-name")
# This is a simple heuristic and might catch non-model strings or miss complex cases.
HF_MODEL_ID_PATTERN = re.compile(r"([\"\'])([\w\-.]+/[\w\-\.]+)\1\'")

# Max length for model descriptions to keep prompts manageable
MAX_MODEL_DESC_LENGTH = 1500

SUMMARY_FILENAME = "summary_highlights.md"
PRIVACY_FILENAME = "privacy_report.md"
TLDR_FILENAME = "tldr_summary.json"


def _is_relevant_file(filename):
    """Check if a file should be included based on patterns."""
    # Ignore files matching ignore patterns (case-insensitive check for some)
    lower_filename = filename.lower()
    if any(
        pattern in lower_filename
        for pattern in [".git", ".hfignore", "readme.md", "license"]
    ):
        return False
    if any(
        filename.endswith(ext) for ext in IGNORE_PATTERNS if ext.startswith(".")
    ):  # Check extensions
        return False
    if any(
        part == pattern
        for part in filename.split("/")
        for pattern in IGNORE_PATTERNS
        if "." not in pattern and "/" not in pattern
    ):  # Check directory/file names
        return False
    if filename in IGNORE_PATTERNS:  # Check full filenames
        return False

    # Include files matching include patterns
    if any(filename.endswith(ext) for ext in INCLUDE_PATTERNS if ext.startswith(".")):
        return True
    if any(filename == pattern for pattern in INCLUDE_PATTERNS if "." not in pattern):
        return True

    # Default to False if not explicitly included (safer)
    # logging.debug(f"File '{filename}' excluded by default.")
    return False


def get_space_code_files(space_id: str) -> dict[str, str]:
    """
    Downloads relevant code and configuration files from a Hugging Face Space.

    Args:
        space_id: The ID of the Hugging Face Space (e.g., 'gradio/hello_world').

    Returns:
        A dictionary where keys are filenames and values are file contents as strings.
        Returns an empty dictionary if the space is not found or has no relevant files.
    """
    code_files = {}
    api = HfApi()

    try:
        logging.info(f"Fetching file list for Space: {space_id}")
        repo_files = api.list_repo_files(repo_id=space_id, repo_type="space")
        logging.info(f"Found {len(repo_files)} total files in {space_id}.")

        relevant_files = [f for f in repo_files if _is_relevant_file(f)]
        logging.info(f"Identified {len(relevant_files)} relevant files for download.")

        for filename in relevant_files:
            try:
                logging.debug(f"Downloading {filename} from {space_id}...")
                file_path = hf_hub_download(
                    repo_id=space_id,
                    filename=filename,
                    repo_type="space",
                    # Consider adding use_auth_token=os.getenv("HF_TOKEN") if accessing private spaces later
                )
                with open(file_path, "r", encoding="utf-8", errors="ignore") as f:
                    content = f.read()
                code_files[filename] = content
                logging.debug(f"Successfully read content of {filename}")
            except EntryNotFoundError:
                logging.warning(
                    f"File {filename} listed but not found in repo {space_id}."
                )
            except UnicodeDecodeError:
                logging.warning(
                    f"Could not decode file {filename} from {space_id} as UTF-8. Skipping."
                )
            except OSError as e:
                logging.warning(f"OS error reading file {filename} from cache: {e}")
            except Exception as e:
                logging.error(
                    f"Unexpected error downloading or reading file {filename} from {space_id}: {e}"
                )

    except RepositoryNotFoundError:
        logging.error(f"Space repository '{space_id}' not found.")
        return {}
    except Exception as e:
        logging.error(f"Failed to list or process files for space {space_id}: {e}")
        return {}

    logging.info(
        f"Successfully retrieved content for {len(code_files)} files from {space_id}."
    )
    return code_files


def extract_hf_model_ids(code_files: dict[str, str]) -> set[str]:
    """
    Extracts potential Hugging Face model IDs mentioned in code files.

    Args:
        code_files: Dictionary of {filename: content}.

    Returns:
        A set of unique potential model IDs found.
    """
    potential_ids = set()
    for filename, content in code_files.items():
        # Limit search to relevant file types
        if filename.endswith((".py", ".json", ".yaml", ".yml", ".toml", ".md")):
            try:
                matches = HF_MODEL_ID_PATTERN.findall(content)
                for _, model_id in matches:
                    # Basic validation: must contain exactly one '/'
                    if model_id.count("/") == 1:
                        # Avoid adding common paths that look like IDs
                        if not any(
                            part in model_id.lower()
                            for part in ["http", "www", "@", " ", ".", ":"]
                        ):  # Check if '/' is only separator
                            if len(model_id) < 100:  # Avoid overly long strings
                                potential_ids.add(model_id)
            except Exception as e:
                logging.warning(f"Regex error processing file {filename}: {e}")

    logging.info(f"Extracted {len(potential_ids)} potential model IDs.")
    # Add simple filter for very common false positives if needed
    # potential_ids = {id for id in potential_ids if id not in ['user/repo']}
    return potential_ids


def get_model_descriptions(model_ids: set[str]) -> dict[str, str]:
    """
    Fetches the README.md content (description) for a set of model IDs.

    Args:
        model_ids: A set of Hugging Face model IDs.

    Returns:
        A dictionary mapping model_id to its description string (or an error message).
    """
    descriptions = {}
    if not model_ids:
        return descriptions

    logging.info(f"Fetching descriptions for {len(model_ids)} models...")
    for model_id in model_ids:
        try:
            # Check if the model exists first (optional but good practice)
            # api.model_info(model_id)

            # Download README.md
            readme_path = hf_hub_download(
                repo_id=model_id,
                filename="README.md",
                repo_type="model",
                # Add token if needing to access private/gated models - unlikely for Space analysis
                # use_auth_token=os.getenv("HF_TOKEN"),
                error_if_not_found=True,  # Raise error if README doesn't exist
            )
            with open(readme_path, "r", encoding="utf-8", errors="ignore") as f:
                description = f.read()
            descriptions[model_id] = description[:MAX_MODEL_DESC_LENGTH] + (
                "... [truncated]" if len(description) > MAX_MODEL_DESC_LENGTH else ""
            )
            logging.debug(f"Successfully fetched description for {model_id}")
        except RepositoryNotFoundError:
            logging.warning(f"Model repository '{model_id}' not found.")
            descriptions[model_id] = "[Model repository not found]"
        except EntryNotFoundError:
            logging.warning(f"README.md not found in model repository '{model_id}'.")
            descriptions[model_id] = "[README.md not found in model repository]"
        except Exception as e:
            logging.error(f"Error fetching description for model '{model_id}': {e}")
            descriptions[model_id] = f"[Error fetching description: {e}]"

    logging.info(f"Finished fetching descriptions for {len(descriptions)} models.")
    return descriptions


def list_cached_spaces(dataset_id: str, hf_token: str | None) -> list[str]:
    """Lists the space IDs (owner/name) that have cached reports in the dataset repository."""
    if not hf_token:
        logging.warning("HF Token not provided, cannot list cached spaces.")
        return []
    try:
        api = HfApi(token=hf_token)
        # Get all filenames in the dataset repository
        all_files = api.list_repo_files(repo_id=dataset_id, repo_type="dataset")

        # Extract unique directory paths that look like owner/space_name
        # by checking if they contain our specific report files.
        space_ids = set()
        for f_path in all_files:
            # Check if the file is one of our report files
            if f_path.endswith(f"/{PRIVACY_FILENAME}") or f_path.endswith(
                f"/{SUMMARY_FILENAME}"
            ):
                # Extract the directory path part (owner/space_name)
                parts = f_path.split("/")
                if len(parts) == 3:  # Expecting owner/space_name/filename.md
                    owner_slash_space_name = "/".join(parts[:-1])
                    # Basic validation: owner and space name shouldn't start with '.'
                    if not parts[0].startswith(".") and not parts[1].startswith("."):
                        space_ids.add(owner_slash_space_name)

        sorted_space_ids = sorted(list(space_ids))
        logging.info(
            f"Found {len(sorted_space_ids)} cached space reports in {dataset_id} via HfApi."
        )
        return sorted_space_ids

    except RepositoryNotFoundError:
        logging.warning(
            f"Dataset {dataset_id} not found or empty when listing cached spaces."
        )
        return []
    except Exception as e:
        logging.error(f"Error listing cached spaces in {dataset_id} via HfApi: {e}")
        return []  # Return empty list on error


def check_report_exists(space_id: str, dataset_id: str, hf_token: str | None) -> bool:
    """Checks if report files already exist in the target dataset repo using HfApi."""
    print(
        f"[Debug Cache Check] Checking for space_id: '{space_id}' in dataset: '{dataset_id}'"
    )  # DEBUG
    if not hf_token:
        logging.warning("HF Token not provided, cannot check dataset cache.")
        print("[Debug Cache Check] No HF Token, returning False.")  # DEBUG
        return False
    try:
        api = HfApi(token=hf_token)
        # List ALL files in the repo
        print(f"[Debug Cache Check] Listing ALL files in repo '{dataset_id}'")  # DEBUG
        all_repo_files = api.list_repo_files(repo_id=dataset_id, repo_type="dataset")
        # DEBUG: Optionally print a subset if the list is huge
        # print(f"[Debug Cache Check] First 10 files returned by API: {all_repo_files[:10]}")

        # Construct the exact paths we expect for the target space_id
        expected_summary_path = f"{space_id}/{SUMMARY_FILENAME}"
        expected_privacy_path = f"{space_id}/{PRIVACY_FILENAME}"
        print(
            f"[Debug Cache Check] Expecting summary file: '{expected_summary_path}'"
        )  # DEBUG
        print(
            f"[Debug Cache Check] Expecting privacy file: '{expected_privacy_path}'"
        )  # DEBUG

        # Check if both expected paths exist in the full list of files
        summary_exists = expected_summary_path in all_repo_files
        privacy_exists = expected_privacy_path in all_repo_files
        exists = summary_exists and privacy_exists
        print(
            f"[Debug Cache Check] Summary exists in full list: {summary_exists}"
        )  # DEBUG
        print(
            f"[Debug Cache Check] Privacy exists in full list: {privacy_exists}"
        )  # DEBUG
        print(f"[Debug Cache Check] Overall exists check result: {exists}")  # DEBUG
        return exists

    except RepositoryNotFoundError:
        logging.warning(
            f"Dataset repository {dataset_id} not found or not accessible during check."
        )
        print(
            f"[Debug Cache Check] Repository {dataset_id} not found, returning False."
        )  # DEBUG
    except Exception as e:
        # ... (error handling remains the same) ...
        print(f"[Debug Cache Check] Exception caught: {type(e).__name__}: {e}")  # DEBUG
        # Note: 404 check based on path_in_repo is no longer applicable here
        # We rely on RepositoryNotFoundError or general Exception
        logging.error(
            f"Error checking dataset {dataset_id} for {space_id} via HfApi: {e}"
        )
        print("[Debug Cache Check] Other exception, returning False.")  # DEBUG
    return False  # Treat errors as cache miss


def download_cached_reports(
    space_id: str, dataset_id: str, hf_token: str | None
) -> dict[str, str]:
    """Downloads cached reports (summary, privacy, tldr json) from the dataset repo.

    Returns:
        Dict containing report contents keyed by 'summary', 'privacy', 'tldr_json_str'.
        Keys will be missing if a specific file is not found.
        Raises error on critical download failures (repo not found, etc.).
    """
    if not hf_token:
        raise ValueError("HF Token required to download cached reports.")

    logging.info(
        f"Attempting to download cached reports for {space_id} from {dataset_id}..."
    )
    reports = {}
    # Define paths relative to dataset root for hf_hub_download
    summary_repo_path = f"{space_id}/{SUMMARY_FILENAME}"
    privacy_repo_path = f"{space_id}/{PRIVACY_FILENAME}"
    tldr_repo_path = f"{space_id}/{TLDR_FILENAME}"  # Path for TLDR JSON

    try:
        # Download summary
        try:
            summary_path_local = hf_hub_download(
                repo_id=dataset_id,
                filename=summary_repo_path,
                repo_type="dataset",
                token=hf_token,
            )
            with open(summary_path_local, "r", encoding="utf-8") as f:
                reports["summary"] = f.read()
            logging.info(f"Successfully downloaded cached summary for {space_id}.")
        except EntryNotFoundError:
            logging.warning(
                f"Cached summary file {summary_repo_path} not found for {space_id}."
            )
        except Exception as e_summary:
            logging.error(
                f"Error downloading cached summary for {space_id}: {e_summary}"
            )
            # Decide if this is critical - for now, we warn and continue

        # Download privacy report
        try:
            privacy_path_local = hf_hub_download(
                repo_id=dataset_id,
                filename=privacy_repo_path,
                repo_type="dataset",
                token=hf_token,
            )
            with open(privacy_path_local, "r", encoding="utf-8") as f:
                reports["privacy"] = f.read()
            logging.info(
                f"Successfully downloaded cached privacy report for {space_id}."
            )
        except EntryNotFoundError:
            logging.warning(
                f"Cached privacy file {privacy_repo_path} not found for {space_id}."
            )
        except Exception as e_privacy:
            logging.error(
                f"Error downloading cached privacy report for {space_id}: {e_privacy}"
            )
            # Decide if this is critical - for now, we warn and continue

        # Download TLDR JSON
        try:
            tldr_path_local = hf_hub_download(
                repo_id=dataset_id,
                filename=tldr_repo_path,
                repo_type="dataset",
                token=hf_token,
            )
            with open(tldr_path_local, "r", encoding="utf-8") as f:
                reports["tldr_json_str"] = f.read()  # Store raw string content
            logging.info(f"Successfully downloaded cached TLDR JSON for {space_id}.")
        except EntryNotFoundError:
            logging.warning(
                f"Cached TLDR file {tldr_repo_path} not found for {space_id}."
            )
            # Don't treat TLDR absence as an error, just won't be in the dict
        except Exception as e_tldr:
            logging.error(
                f"Error downloading cached TLDR JSON for {space_id}: {e_tldr}"
            )
            # Don't treat TLDR download error as critical, just won't be included

        # Check if at least one report was downloaded successfully
        if not reports.get("summary") and not reports.get("privacy"):
            raise FileNotFoundError(
                f"Failed to download *any* primary cache files (summary/privacy) for {space_id}"
            )

        return reports

    except RepositoryNotFoundError as e_repo:
        logging.error(
            f"Cache download error: Dataset repo {dataset_id} not found. {e_repo}"
        )
        raise FileNotFoundError(f"Dataset repo {dataset_id} not found") from e_repo
    except Exception as e_critical:  # Catch other potential critical errors
        logging.error(
            f"Unexpected critical error downloading cached reports for {space_id} from {dataset_id}: {e_critical}"
        )
        raise IOError(
            f"Failed critically during cached report download for {space_id}"
        ) from e_critical


def upload_reports_to_dataset(
    space_id: str,
    summary_report: str,
    detailed_report: str,
    dataset_id: str,
    hf_token: str | None,
):
    """Uploads the generated reports to the specified dataset repository."""
    if not hf_token:
        logging.warning("HF Token not provided, skipping dataset report upload.")
        return

    logging.info(
        f"Attempting to upload reports for {space_id} to dataset {dataset_id}..."
    )
    api = HfApi(token=hf_token)

    # Sanitize space_id for path safety (though HF Hub usually handles this)
    safe_space_id = space_id.replace("..", "")

    try:
        with tempfile.TemporaryDirectory() as tmpdir:
            summary_path_local = os.path.join(tmpdir, SUMMARY_FILENAME)
            privacy_path_local = os.path.join(tmpdir, PRIVACY_FILENAME)

            with open(summary_path_local, "w", encoding="utf-8") as f:
                f.write(summary_report)
            with open(privacy_path_local, "w", encoding="utf-8") as f:
                f.write(detailed_report)

            commit_message = f"Add privacy analysis reports for Space: {safe_space_id}"
            repo_url = api.create_repo(
                repo_id=dataset_id,
                repo_type="dataset",
                exist_ok=True,
            )
            logging.info(f"Ensured dataset repo {repo_url} exists.")

            api.upload_file(
                path_or_fileobj=summary_path_local,
                path_in_repo=f"{safe_space_id}/{SUMMARY_FILENAME}",
                repo_id=dataset_id,
                repo_type="dataset",
                commit_message=commit_message,
            )
            logging.info(f"Successfully uploaded summary report for {safe_space_id}.")

            api.upload_file(
                path_or_fileobj=privacy_path_local,
                path_in_repo=f"{safe_space_id}/{PRIVACY_FILENAME}",
                repo_id=dataset_id,
                repo_type="dataset",
                commit_message=commit_message,
            )
            logging.info(
                f"Successfully uploaded detailed privacy report for {safe_space_id}."
            )

    except Exception as e:
        logging.error(
            f"Failed to upload reports for {safe_space_id} to dataset {dataset_id}: {e}"
        )


# Example usage (for testing)
# if __name__ == '__main__':
#     # Make sure HF_TOKEN is set if accessing private spaces or for higher rate limits
#     from dotenv import load_dotenv
#     load_dotenv()
#     # test_space = "gradio/hello_world"
#     test_space = "huggingface-projects/diffusers-gallery" # A more complex example
#     # test_space = "nonexistent/space" # Test not found
#     files_content = get_space_code_files(test_space)
#     if files_content:
#         print(f"\n--- Files retrieved from {test_space} ---")
#         for name in files_content.keys():
#             print(f"- {name}")
#         # print("\n--- Content of app.py (first 200 chars) ---")
#         # print(files_content.get("app.py", "app.py not found")[:200])
#     else:
#         print(f"Could not retrieve files from {test_space}")