from twisted.python import log

import logging

from sqlalchemy import create_engine

from sqlalchemy.exc import DatabaseError

from sets import Set

import os

from .config import configParser, confFiles, main

from .error import NeededOption, ValidateException

from .offer.provider import providers, getProvider

from .model.schema import Base, Offer

from .model.utils import WithSession

from . import config

def checkConfig():

    try:

        l = configParser.read(confFiles)

        if len(l) > 0:

            return True

        return False

    except (NeededOption,ValidateException) as e:

        log.msg("Error while processing config file: %s"%e,logLevel=logging.ERROR)

        return False

def checkDatabase():

    engine = create_engine(config.main.dburl)

    for t in Base.metadata.sorted_tables:

        if not t.exists(engine):

            return False

    return True

def checkDatabaseConnection():

    try:

        engine = create_engine(config.main.dburl)

        con = engine.connect()

        con.close()

        return True

    except DatabaseError as e:

        log.msg("Error while trying to connect to database\n%s"%e,logLevel=logging.ERROR)

        return False

def createDatabase():

    engine = create_engine(config.main.dburl)

    Base.metadata.create_all(engine)

def createSampleConfig():

    if not os.path.exists("iro.conf"):

        with open("iro.conf",'w') as fp:

            fp.write("\n".join(main.sampleConf()))

            fp.write("\n")

            k = providers.keys()

            k.sort()

            for p in k:

                fp.write("\n".join(providers[p](p).sampleConf()))

                fp.write("\n")

    else:

        log.msg("iro.conf exists and will not be overwritten.")

def getAllRoutes(providers,write=False):

    engine = create_engine(config.main.dburl)

    ret={"orphand":Set(),"added":Set()}

    with WithSession(engine,write) as session:

        ret["orphand"]=Set([i[0] for i in session.query(Offer.name).all()])

        for provider in providers:

            p=getProvider(provider,configParser.get(provider,"typ"),configParser.items(provider))

            for t in p.typs:

                for r in p.typs[t]:

                    try:

                        ret["orphand"].remove(Offer.get(session, provider, r, t).name)

                    except:

                        ret["added"].add("%s_%s_%s"%(provider,t,r))

    return ret