# --- datamodel.py ---


from os.path import join
import shelve

class Loader:
        PATH = '/tmp/persistent/pso/sessions/members1.psod'
	db = shelve.open(PATH)
        def load(self, id):
                return self.db[id]
        def save(self, id, obj):
		self.db[id] = obj
		self.db.sync()
	def fetch(self, line=0, pageSize=None):
		if pageSize is None:
			pageSize = len(self.db)
		all = self.db.items()
		all.sort()
		return [record for id, record in all[line:line+pageSize]]
		
		


class Member(dict):
        IDKEY='memberId'
        LOADER = Loader()
        def load(classObj, id, loader=None):
		if loader is None:
                        loader = classObj.LOADER
		try:
			return loader.load(id)
		except KeyError:
			return 	
        load = classmethod(load)

        def __init__(self, **kwa):
                dict.__init__(self, kwa)

        def save(self, loader = None):
                if loader is None:
                        loader = self.LOADER
                loader.save(self[self.IDKEY], self)

if __name__ =='__main__':
	import sys
	cmd = sys.argv[1]
	if  cmd == 'test':
		class LocalLoader(Loader):
			PATH = 'members.psod'
		class LocalMember(Member):
			LOADER= LocalLoader()
		member = LocalMember.load(id)
		if member is None:
			print 'creating new member',
			member =  LocalMember(memberId=id)
		print member
		member['name']= 'Bond'
		member.save()
		secondComming = LocalMember.load(id)
		print secondComming
		for id in range(100):
			idstr = "%04d" % id
			LocalMember(memberId=idstr).save()
		print LocalMember.LOADER.fetch(line=7, pageSize=13)
	elif cmd =='list':
		print Member.LOADER.PATH
		print Member.LOADER.fetch()