import requests

class ExchangeInfo:

	def __get__( self, *args ):
		return self.value

	def __set__( self, obj, value=None ):

		if value is None:
			value = self.get_exchange_info()

		self.value = value

	def get_exchange_info( self ):
		url = 'https://api.binance.com/api/v3/exchangeInfo'
		r = requests.get( url )

		print( f'Call to Binance' )

		if not str( r.status_code ).startswith( '2' ):
			raise RuntimeError( 'Meh, handle for errors however you want' )

		return r.json()

class BinanceSymbols:
	exchange_info = ExchangeInfo()

	def __init__( self, exchange_info=None ):
		self.exchange_info = exchange_info

	def get_exchange_info( self ):
		return self.exchange_info

	def get_symbol_info( self, symbol:str='' ) -> dict:

		if not symbol:
			raise RuntimeError( 'Either a symbol, or previously collected symbol info must be passed to Symbols.get_filters()' )

		for market in self.exchange_info[ 'symbols' ]:

			if market[ 'symbol'] == symbol:
				return market

		raise ValueError( f'Could not find info for provided symbol: { symbol }' )

	def get_filters( self, symbol_info:dict=None, symbol:str=None ) -> list:
		if not symbol_info:

			symbol_info = self.get_symbol_info( symbol )

		return symbol_info[ 'filters' ]

	def get_filter( self, filter_type, **kwargs ):

		try:
			filters = kwargs[ 'filters' ]

		except:

			filters = self.get_filters( **kwargs )

		if filters:

			for _filter in filters:

				if _filter[ 'filterType' ] == filter_type:
					return _filter

		raise ValueError( f'Could not find filter of type: { filter_type } in { filters }' )

	def get_min_notional( self, **kwargs ) -> dict:
		return self.get_filter( 'MIN_NOTIONAL', **kwargs )

	def get_lot_size( self, **kwargs ) -> dict:
		return self.get_filter( 'LOT_SIZE', **kwargs )

	def get_step_size( self, **kwargs ) -> str:
		return self.get_lot_size( **kwargs )[ 'stepSize' ]

	def get_min_notional_and_lot_size( self, **kwargs ) -> dict:
		symbol_info = self.get_symbol_info( **kwargs )

		params = {
			'filters': self.get_filters( symbol_info=symbol_info )
		}

		return {
			'min_notional':self.get_min_notional( **params ),
			'lot_size':self.get_lot_size( **params ),
			'step_size':self.get_step_size( **params )
		}

def main():

	binance_symbols = BinanceSymbols()

	symbols = {
		'BTCUSDT',
		'VETUSDT',
		'OMGBTC'
	}

	for symbol in symbols:
		info = binance_symbols.get_min_notional_and_lot_size( symbol=symbol )

		print( f'\n{symbol=}, {info=}')



if __name__ == '__main__':
	main()