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#!/usr/bin/env python

#
# Abstraction around shelves / data stores used by Fourstar
#
# provides an abstraction to arbitary store backend
#

# Store as a shelf


#import sqlite3
from sqlite3 import dbapi2 as sqlite
from SQLTemplates import *
from Error import *

class Store:
	def __init__(self):
		self.file = None
		self.db = None
		self.cursor = None

	def create(self,file):
		print file
		self.file = file
		self.db = sqlite.connect(file)
		self.cursor = self.db.cursor()

		for statement in create_fourstar_db.keys():
			self.cursor.execute(create_fourstar_db[statement])

		if not self.check_schema():
			raise CreateError

		return True

	def connect(self,file):
		print file
		self.file = file
		self.db = sqlite.connect(file)
		self.cursor = self.db.cursor()

		if not self.check_schema():
			raise ConnectError, "Schema not matching"

		return True

	def check_schema(self):
		for statement in create_fourstar_db.keys():
			self.cursor.execute("select sql from sqlite_master where tbl_name=?;",(statement,))
			sql = self.cursor.fetchone()
			if not sql:
				return 0
			#print sql[0]
			#print create_fourstar_db[statement]
			if sql[0] != create_fourstar_db[statement]:
				return 0

		return 1

	def status(self):
		if not self.check_schema():
			raise StatusSchemaError

		print "status foo!"
#


# is there any reason why this needs to abstract anything other than
# SQL?
#
# command, arg list
#  select blah from foo where thing=%s