import os
import json
from pathlib import Path
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

def get_anthropic_api_key() -> str:
    """Get the Anthropic API key from environment"""
    api_key = os.getenv("ANTHROPIC_API_KEY")
    if not api_key:
        raise ValueError("ANTHROPIC_API_KEY not found in environment variables")
    return api_key

# Default configurations
DEFAULT_CONFIG = {
    "app": {
        "name": "EduAI Platform",
        "version": "1.0.0",
        "description": "AI-powered educational platform",
        "debug": False
    },
    
    "ui": {
        "theme": "light",
        "page_title": "EduAI Platform",
        "page_icon": "🎓",
        "layout": "wide",
        "initial_sidebar_state": "expanded"
    },
    
    "ai": {
        "model": {
            "name": "claude-3-opus-20240229",
            "max_tokens": 1024,
            "temperature": 0.7
        },
        "voice": {
            "enabled": True,
            "rate": 150,
            "volume": 0.9,
            "prefer_female_voice": True
        },
        "speech_recognition": {
            "energy_threshold": 4000,
            "timeout": 5
        }
    },
    
    "learning": {
        "max_modules": 8,
        "achievement_levels": [1, 5, 10, 25],
        "difficulty_levels": ["beginner", "intermediate", "advanced"],
        "learning_styles": ["interactive", "visual", "theoretical", "practical"],
        "mastery_thresholds": {
            "not_started": 0.0,
            "in_progress": 0.5,
            "mastered": 0.8
        }
    },
    
    "features": {
        "voice_interaction": True,
        "code_playground": True,
        "achievements": True,
        "learning_paths": True,
        "progress_tracking": True
    }
}

class Config:
    _instance = None
    _config = None

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super(Config, cls).__new__(cls)
            cls._instance._load_config()
        return cls._instance

    def _load_config(self):
        """Load configuration from file or use defaults"""
        config_path = Path("config.json")
        
        if config_path.exists():
            try:
                with open(config_path) as f:
                    self._config = {**DEFAULT_CONFIG, **json.load(f)}
            except Exception as e:
                print(f"Error loading config file: {e}")
                self._config = DEFAULT_CONFIG
        else:
            self._config = DEFAULT_CONFIG

    def get(self, key_path: str, default=None):
        """
        Get configuration value using dot notation
        Example: config.get('ai.model.name')
        """
        value = self._config
        for key in key_path.split('.'):
            try:
                value = value[key]
            except (KeyError, TypeError):
                return default
        return value

    def get_all(self):
        """Get complete configuration dictionary"""
        return self._config.copy()

    def save(self):
        """Save current configuration to file"""
        try:
            with open("config.json", "w") as f:
                json.dump(self._config, f, indent=2)
        except Exception as e:
            print(f"Error saving config file: {e}")

# Helper functions for common config operations
def get_model_name() -> str:
    """Get AI model name from config"""
    return Config().get('ai.model.name')

def get_model_max_length() -> int:
    """Get model max token length from config"""
    return Config().get('ai.model.max_tokens')

def get_voice_settings() -> dict:
    """Get voice settings from config"""
    return Config().get('ai.voice')

def get_app_settings() -> dict:
    """Get application settings from config"""
    return Config().get('app')

def get_ui_settings() -> dict:
    """Get UI settings from config"""
    return Config().get('ui')

def get_learning_settings() -> dict:
    """Get learning-related settings from config"""
    return Config().get('learning')

def is_feature_enabled(feature_name: str) -> bool:
    """Check if a feature is enabled"""
    return Config().get(f'features.{feature_name}', False)

def get_mastery_thresholds() -> dict:
    """Get mastery level thresholds"""
    return Config().get('learning.mastery_thresholds')

def save_config():
    """Save current configuration"""
    Config().save()

# Initialize configuration on module import
config = Config()