"""Upload Pak Angels AI Tutor to a Hugging Face Space.

Required environment variables:
    HF_TOKEN: A Hugging Face access token with write access to the Space.
    HF_SPACE_ID: The Space repo id, for example "your-username/pak-angels-ai-tutor".

Optional environment variables:
    HF_COMMIT_MESSAGE: Custom commit message for the upload.
    HF_PRIVATE_SPACE: Set to "true" to create a private Space when using --create.
"""

from __future__ import annotations

import argparse
import os
import sys
from pathlib import Path

from huggingface_hub import HfApi
from huggingface_hub.utils import HfHubHTTPError


PROJECT_ROOT = Path(__file__).resolve().parent
DEFAULT_IGNORE_PATTERNS = [
    ".env",
    ".env.local",
    ".env.*.local",
    ".git/",
    ".git/**",
    ".venv/",
    ".venv/**",
    "venv/",
    "venv/**",
    "__pycache__/",
    "__pycache__/**",
    "*.pyc",
    ".DS_Store",
    ".pytest_cache/",
    ".pytest_cache/**",
    ".ruff_cache/",
    ".ruff_cache/**",
    ".mypy_cache/",
    ".mypy_cache/**",
    "dist/",
    "dist/**",
    "build/",
    "build/**",
    "*.egg-info/",
    "*.egg-info/**",
    "*.log",
    "tmp/",
    "tmp/**",
    "temp/",
    "temp/**",
]


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(
        description="Upload the current Pak Angels AI Tutor project to Hugging Face Spaces."
    )
    parser.add_argument(
        "--space-id",
        default=os.getenv("HF_SPACE_ID", "").strip(),
        help='Hugging Face Space id, for example "username/pak-angels-ai-tutor".',
    )
    parser.add_argument(
        "--token",
        default=os.getenv("HF_TOKEN", "").strip(),
        help="Hugging Face write token. Prefer setting HF_TOKEN instead of passing this flag.",
    )
    parser.add_argument(
        "--commit-message",
        default=os.getenv("HF_COMMIT_MESSAGE", "Deploy Pak Angels AI Tutor"),
        help="Commit message shown in the Hugging Face Space repository.",
    )
    parser.add_argument(
        "--repo-type",
        default="space",
        choices=["space"],
        help="Repository type. Spaces deployments use 'space'.",
    )
    parser.add_argument(
        "--create",
        action="store_true",
        help="Create the Gradio Space if it does not already exist.",
    )
    parser.add_argument(
        "--private",
        action="store_true",
        default=os.getenv("HF_PRIVATE_SPACE", "").lower() in {"1", "true", "yes"},
        help="Create the Space as private when --create is used.",
    )
    return parser.parse_args()


def validate_inputs(space_id: str, token: str) -> None:
    missing = []
    if not space_id:
        missing.append("HF_SPACE_ID")
    if not token:
        missing.append("HF_TOKEN")

    if missing:
        joined = ", ".join(missing)
        raise ValueError(
            f"Missing required setting(s): {joined}. Set them as environment variables "
            "or pass --space-id and --token."
        )

    if "/" not in space_id:
        raise ValueError('HF_SPACE_ID should look like "username/space-name".')

    placeholder_values = {
        "your_hugging_face_write_token_here",
        "your-token",
        "your_token",
    }
    placeholder_space_ids = {
        "your-username/your-space-name",
        "username/space-name",
        "your-username/pak-angels-ai-tutor",
    }
    if token in placeholder_values:
        raise ValueError("HF_TOKEN is still a placeholder. Use a real Hugging Face write token.")
    if space_id in placeholder_space_ids:
        raise ValueError(
            "HF_SPACE_ID is still a placeholder. Use your real Space id, such as "
            '"mohammadanwarkhan/pak-angels-ai-tutor".'
        )


def ensure_space_exists(api: HfApi, args: argparse.Namespace) -> None:
    if not args.create:
        return

    api.create_repo(
        repo_id=args.space_id,
        repo_type=args.repo_type,
        private=args.private,
        space_sdk="gradio",
        exist_ok=True,
    )


def preflight_check(api: HfApi, args: argparse.Namespace) -> None:
    whoami = api.whoami()
    account_name = whoami.get("name") or whoami.get("fullname") or "authenticated account"
    print(f"Authenticated with Hugging Face as: {account_name}")

    try:
        api.repo_info(repo_id=args.space_id, repo_type=args.repo_type)
        print(f"Space is accessible: {args.space_id}")
    except HfHubHTTPError as error:
        if args.create:
            raise
        raise RuntimeError(
            f"The token cannot access the Space '{args.space_id}'. Check that the Space id "
            "is exact and that this Hugging Face token has write access to that Space. "
            "If the Space does not exist, rerun with --create."
        ) from error


def upload_project(args: argparse.Namespace) -> str:
    api = HfApi(token=args.token)
    ensure_space_exists(api, args)
    preflight_check(api, args)
    api.upload_folder(
        folder_path=str(PROJECT_ROOT),
        repo_id=args.space_id,
        repo_type=args.repo_type,
        commit_message=args.commit_message,
        ignore_patterns=DEFAULT_IGNORE_PATTERNS,
    )
    return f"https://huggingface.co/spaces/{args.space_id}"


def main() -> int:
    args = parse_args()
    try:
        validate_inputs(args.space_id, args.token)
        url = upload_project(args)
    except ValueError as error:
        print(f"Configuration error: {error}", file=sys.stderr)
        return 2
    except HfHubHTTPError as error:
        print(f"Hugging Face upload failed: {error}", file=sys.stderr)
        print(
            "Check that HF_SPACE_ID is your real Space id, HF_TOKEN is a real write token, "
            "and the Space exists. If it does not exist, rerun with --create.",
            file=sys.stderr,
        )
        return 1
    except Exception as error:
        print(f"Deployment failed: {error}", file=sys.stderr)
        return 1

    print("Deployment upload complete.")
    print(f"Space URL: {url}")
    print("Remember to set OPENAI_API_KEY in the Space secrets before testing the tutor.")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())