import json 

# different useful functions

# line = '-----------'

# def write_to_file(filename, string):
# 	path = './'+filename
# 	f = open(path,'a+')
# 	f.write(string)
# 	f.write('\n')
# 	if 'mark' in filename:
# 		f.write(line)
# 		f.write('\n')
# 	f.close()

def load_db(filename):
	try: 
		open(filename,'r')
	except:
		open(filename,'w+')
	f = open(filename,'r').read()
	if f == '':
		f = '{}'
	db = json.loads(f)
	# find last_id used in db
	keys = [int(x) for x in db.keys()]
	keys.sort()
	if len(keys) == 0:
		x = 0
	else:
		x = int(keys[-1])
	return db, x

def write_db(filename, db):
	f = open(filename, 'w')
	f.write(json.dumps(db, indent=4))
	f.close()