from __future__ import annotations
import logging
from typing import Any

import importlib
import importlib.util
import logging
import os
import sys


# Hub constants for downloading additional files
HUB_REPO_ID = "LightwheelAI/lw_benchhub_env"


def _download_and_import(filename: str):
    """Download file from Hub and import as module."""
    from huggingface_hub import hf_hub_download

    local_path = hf_hub_download(repo_id=HUB_REPO_ID, filename=filename)
    module_dir = os.path.dirname(local_path)

    # Add directory to sys.path so modules can import each other
    if module_dir not in sys.path:
        sys.path.insert(0, module_dir)

    module_name = filename.replace(".py", "")

    # Read file content and replace relative imports with absolute imports
    with open(local_path) as f:
        content = f.read()

    # Replace relative imports (e.g., "from .errors" -> "from errors")
    content = content.replace("from .errors import", "from errors import")
    content = content.replace("from .isaaclab_env_wrapper import", "from isaaclab_env_wrapper import")

    # Create module and execute modified content
    module = importlib.util.module_from_spec(importlib.util.spec_from_file_location(module_name, local_path))
    sys.modules[module_name] = module

    # Compile and execute the modified code
    code = compile(content, local_path, "exec")
    exec(code, module.__dict__)  # noqa: S102

    return module


try:
    from .errors import IsaacLabArenaCameraKeyError, IsaacLabArenaStateKeyError
    from .isaaclab_env_wrapper import IsaacLabEnvWrapper, cleanup_isaaclab
except ImportError:
    _errors = _download_and_import("errors.py")
    _isaaclab_wrapper = _download_and_import("isaaclab_env_wrapper.py")
    IsaacLabEnvWrapper = _isaaclab_wrapper.IsaacLabEnvWrapper
    cleanup_isaaclab = _isaaclab_wrapper.cleanup_isaaclab
    IsaacLabArenaCameraKeyError = _errors.IsaacLabArenaCameraKeyError
    IsaacLabArenaStateKeyError = _errors.IsaacLabArenaStateKeyError


def make_env(n_envs: int = 1, use_async_envs: bool = False, cfg: Any = None):
    """
    Create vectorized environments for leisaac task.
    Args:
        n_envs: Number of parallel environments
        use_async_envs: Whether to use AsyncVectorEnv or SyncVectorEnv
            (not use now)
        cfg: Environment configuration object (EnvConfig)
    Returns:
        ManagerBasedRLEnv or DirectRLEnv inherit from gym.Env implemented in IsaacLab
    """

    # Get config_path from cfg.config_path (set via --env.kwargs)
    if cfg is None or not hasattr(cfg, 'config_path'):
        raise ValueError(
            "Please set config_path via --env.kwargs='{\"config_path\": \"...\"}'")
    config_path = cfg.config_path
    logging.warning(
        "Ignore n_envs and use_async_envs in parameter, we use the config path to create the environment")

    from lw_benchhub.utils.envhub_utils import export_env_for_envhub

    raw_env, environment, task, render_mode, episode_length, app_launcher = export_env_for_envhub(
        config_path=config_path
    )

    wrapped_env = IsaacLabEnvWrapper(
        raw_env,
        episode_length=episode_length,
        task=task,
        render_mode=render_mode,
        simulation_app=app_launcher,
    )
    logging.info(f"Created: {environment} with {wrapped_env.num_envs} envs")

    return {environment: {0: wrapped_env}}