#!/usr/bin/env python3
"""
Configuration loader for Arduino UNO Q project
"""

import json
import os
from pathlib import Path

class Config:
    def __init__(self, config_file="config.json"):
        self.config_file = Path(config_file)
        self.config = self.load_config()
    
    def load_config(self):
        """Load configuration from JSON file"""
        if not self.config_file.exists():
            # Try to copy from example
            example_file = Path("config.example.json")
            if example_file.exists():
                print(f"Creating config from example: {self.config_file}")
                import shutil
                shutil.copy(example_file, self.config_file)
                print("Please edit config.json with your personal settings")
            else:
                raise FileNotFoundError(f"Config file {self.config_file} not found")
        
        try:
            with open(self.config_file, 'r') as f:
                config = json.load(f)
            
            # Expand paths
            self.expand_paths(config)
            return config
            
        except json.JSONDecodeError as e:
            raise ValueError(f"Invalid JSON in config file: {e}")
    
    def expand_paths(self, config):
        """Expand ~ and relative paths"""
        if 'arduino_uno_q' in config and 'ssh_key' in config['arduino_uno_q']:
            ssh_key = config['arduino_uno_q']['ssh_key']
            if ssh_key.startswith('~'):
                config['arduino_uno_q']['ssh_key'] = str(Path.home() / ssh_key[1:])
        
        if 'paths' in config:
            for key, path in config['paths'].items():
                if isinstance(path, str) and path.startswith('~'):
                    config['paths'][key] = str(Path.home() / path[1:])
    
    def get(self, key_path, default=None):
        """Get configuration value by dot notation"""
        keys = key_path.split('.')
        value = self.config
        
        for key in keys:
            if isinstance(value, dict) and key in value:
                value = value[key]
            else:
                return default
        
        return value
    
    def get_arduino_config(self):
        """Get Arduino UNO Q connection configuration"""
        return self.get('arduino_uno_q', {})
    
    def get_build_config(self):
        """Get build configuration"""
        return self.get('build', {})
    
    def get_paths(self):
        """Get paths configuration"""
        return self.get('paths', {})
    
    def get_led_matrix_config(self):
        """Get LED Matrix configuration"""
        return self.get('led_matrix', {})

# Global config instance
config = Config()