import sqlalchemy as sa
import datetime #<- will be used to set default dates on models

from paginate_sqlalchemy import SqlalchemyOrmPage #<- provides pagination
from ..models.blog_record import BlogRecord
from markdown2 import Markdown


class BlogRecordService(object):

    @classmethod
    def all(cls, request):
        query = request.dbsession.query(BlogRecord)
        return query.order_by(sa.desc(BlogRecord.created))

    @classmethod
    def by_id(cls, request, _id):
        query = request.dbsession.query(BlogRecord)
        return query.get(_id)

    @classmethod
    def get_paginator(cls, request, page=1):
        query = request.dbsession.query(BlogRecord)
        query = query.order_by(sa.desc(BlogRecord.created))
        query_params = request.GET.mixed()

        def url_maker(link_page):
            # replace page param with values generated by paginator
            query_params['page'] = link_page
            return request.current_route_url(_query=query_params)

        return SqlalchemyOrmPage(query, page, items_per_page=5,
                                 url_maker=url_maker)

    @classmethod
    def proc_after_create(cls, request, _id):
        entry = request.dbsession.query(BlogRecord).get(_id)
        # set default values
        if entry.tag == '':
            entry.tag = 'pyramid'
        if entry.topic == '':
            entry.topic = 'blog'
        # convertir mardown en HTML
        markdowner = Markdown()
        entry.body_html = markdowner.convert(entry.body)
        return 

    @classmethod
    def proc_after_update(cls, request, _id):
        entry = request.dbsession.query(BlogRecord).get(_id)
        entry.edited = datetime.datetime.now()
        # convertir mardown en HTML
        markdowner = Markdown()
        entry.body_html = markdowner.convert(entry.body)
        return