"""
Environment Detection Utilities

This module provides utilities to detect the deployment environment
and configure authentication accordingly.
"""

import os
from typing import Dict, Any, Optional


def is_huggingface_space() -> bool:
    """
    Detect if the application is running in Hugging Face Spaces.
    
    Returns:
        bool: True if running in HF Spaces, False otherwise
    """
    # HF Spaces sets specific environment variables
    hf_indicators = [
        "SPACE_ID",           # HF Space identifier
        "SPACE_AUTHOR_NAME",  # Space author
        "SPACE_REPO_NAME",    # Space repository name
        "OAUTH_CLIENT_ID",    # OAuth client ID (when oauth enabled)
    ]
    
    return any(os.getenv(indicator) for indicator in hf_indicators)


def is_local_development() -> bool:
    """
    Detect if the application is running in local development mode.
    
    Returns:
        bool: True if running locally, False otherwise
    """
    return not is_huggingface_space()


def get_environment_info() -> Dict[str, Any]:
    """
    Get comprehensive environment information.
    
    Returns:
        Dict containing environment details
    """
    env_info = {
        "is_hf_space": is_huggingface_space(),
        "is_local_dev": is_local_development(),
        "space_id": os.getenv("SPACE_ID"),
        "space_author": os.getenv("SPACE_AUTHOR_NAME"),
        "space_repo": os.getenv("SPACE_REPO_NAME"),
        "oauth_enabled": bool(os.getenv("OAUTH_CLIENT_ID")),
        "host": os.getenv("HOST", "localhost"),
        "port": os.getenv("PORT", "7860"),
    }
    
    return env_info


def should_enable_auth() -> bool:
    """
    Determine if authentication should be enabled based on environment.
    
    Returns:
        bool: True if auth should be enabled, False otherwise
    """
    return is_huggingface_space()


def get_oauth_config() -> Optional[Dict[str, str]]:
    """
    Get OAuth configuration if available.
    
    Returns:
        Dict with OAuth config or None if not available
    """
    if not should_enable_auth():
        return None
        
    # Force HF-compatible scope for HF Spaces, ignore environment variable
    if is_huggingface_space():
        # HF automatically includes 'openid profile', we specify additional scopes
        scopes = "openid profile read-repos"
    else:
        scopes = os.getenv("OAUTH_SCOPES", "read-repos")
    
    # Warn about unsupported scopes for HF Spaces
    if is_huggingface_space():
        unsupported_scopes = []
        for scope in scopes.split():
            if scope not in ["email", "read-repos", "write-repos", "manage-repos", 
                           "read-mcp", "write-discussions", "read-billing", 
                           "inference-api", "jobs", "webhooks"]:
                unsupported_scopes.append(scope)
        
        if unsupported_scopes:
            print(f"⚠️ Warning: Unsupported OAuth scopes detected: {unsupported_scopes}")
            print("📝 Supported HF scopes: email, read-repos, write-repos, manage-repos, read-mcp, write-discussions, read-billing, inference-api, jobs, webhooks")
        
    oauth_config = {
        "client_id": os.getenv("OAUTH_CLIENT_ID"),
        "client_secret": os.getenv("OAUTH_CLIENT_SECRET"),
        "scopes": scopes,
        "provider_url": os.getenv("OPENID_PROVIDER_URL", "https://huggingface.co"),
    }
    
    # Only return config if client_id is available
    if oauth_config["client_id"]:
        return oauth_config
    
    return None


def debug_environment() -> None:
    """
    Print debug information about the current environment.
    """
    env_info = get_environment_info()
    oauth_config = get_oauth_config()
    
    print("🌍 Environment Debug Information:")
    print("=" * 50)
    print(f"🏗️ Environment Type: {'HF Spaces' if env_info['is_hf_space'] else 'Local Development'}")
    print(f"🔐 Authentication: {'Enabled' if should_enable_auth() else 'Disabled'}")
    
    if env_info['is_hf_space']:
        print(f"🆔 Space ID: {env_info['space_id']}")
        print(f"👤 Author: {env_info['space_author']}")
        print(f"📦 Repo: {env_info['space_repo']}")
        
        if oauth_config:
            print(f"🔑 OAuth Client ID: {oauth_config['client_id'][:8]}..." if oauth_config['client_id'] else "Not set")
            print(f"🔒 OAuth Scopes: {oauth_config['scopes']}")
        else:
            print("❌ OAuth not configured")
    else:
        print("🏠 Running in local development mode")
        print("💡 Authentication will be automatically enabled when deployed to HF Spaces")
    
    print("=" * 50)