from .dbdefer import dbdefer

import schema

from ..config import configParser

from ..offer import getProvider, Offer

@dbdefer

def extendProvider(session, user, typ, ps):

    """extend and reduce the offer list to allowed routes for **user**.

    - extend the "default" to the default offerlist of the **user**.

    - extend a Provider name to all routes of that provider.

    :param session: a valid session ( created by decorator :func:`iro.model.dbdefer.dbdefer`)

    :param `iro.model.schema.User` user: a user object

    :param string typ: typ of the message

    :param ps: a list of strings or a string, each one offer name or provider name

    :return: a extended an reduced offer list

    """

    user = session.merge(user)

    ret = []

    if ps == "default" or ps == ["default"]:

        ps = (q[0] for q in  user.routes(typ,default=True))

    for p in ps:

        if p not in ret and user.has_right(typ, offer_name = p): 

                ret.append(p)

        elif user.providers(typ).filter(schema.Offer.provider==p).first():

            for r in providers[p].typs[typ]:

                n = user.has_right(typ, provider=p, route=r)

                if n and n not in ret:

                    ret.append(n)

    return ret

@dbdefer

def loadOffers(session):

    """loading Offers from database and configuration file and store them in :attr:`~iro.model.offer.offers` and :attr:`~iro.model.offer.providers`.

    :param session: a valid session ( created by decorator :func:`iro.model.dbdefer.dbdefer`)

    """

    offers.clear()

    providers.clear()

    for provider in ( s for s in configParser.sections() if not s in ["main",]):

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

        for t in p.typs:

            for r in p.typs[t]:

                n = schema.Offer.get(session, provider, r, t).name

                offers[n]=Offer(provider=p,route=r,typ=t,name=n)

        providers[provider]=p

offers={}

"""A dict of all available offers -- key is the offer name"""

providers={}

"""A dict of all available providers -- key is the provider name"""

configParser.registerReload(loadOffers)