#! /usr/bin/env python3
# encoding: utf-8

import jsmin
import json

class Config:
	def __init__(self, source=None, readonly=False):
		"""
		Can be loaded from a JSON file (str path) or from a python dict.
		
		The JSON file can contain C++ style comments.
		"""
		
		if type(source) == str:
			with open(source) as f:
				initial = json.loads(jsmin.jsmin(f.read()))
		elif source is None:
			initial = {}
		else:
			initial = source
		
		assert type(initial) == dict
		object.__setattr__(self, "raw", initial)
		object.__setattr__(self, "readonly", readonly)
	
	def keys(self):
		return self.raw.keys()
	
	def values(self):
		return self.raw.values()
	
	def __getitem__(self, name):
		return self.raw[name]
	
	def __setitem__(self, name, value):
		if self.readonly:
			raise AttributeError("object is not writable")
		
		self.raw[name] = value
	
	def __setattr__(self, name, value):
		if self.readonly:
			raise AttributeError("object is not writable")
		
		self.raw[name] = value
	
	def __getattr__(self, name):
		matches = [key for key in self.raw if key.replace("-", "_") == name]
		
		if matches:
			assert len(matches) == 1
			
			value = self.raw[matches[0]]
			
			if type(value) == dict:
				return Config(value)
			else:
				return value
		else:
			raise KeyError(name)
	
	def __contains__(self, name):
		return name in self.raw
	
	def __repr__(self):
		return "Config(%s)" %(" ".join("%s=%s" %(k, "…" if type(v) == dict else v) for k, v in self.raw.items()))