from Feed import Feed
from FeedEntry import FeedEntry
from sqlalchemy import Column
from sqlalchemy import DateTime
from sqlalchemy import ForeignKey
from sqlalchemy import Integer
from sqlalchemy import MetaData
from sqlalchemy import String
from sqlalchemy import Table
from sqlalchemy.orm import mapper
from sqlalchemy.orm import relation

def createMapping(engine):
    metadata = MetaData(engine)
    
    feedTable = Table("feed", metadata,
        Column("pk", Integer, primary_key=True),
        Column("title", String(255), nullable=False),
        Column("rss_url", String(255), nullable=False)
    )
    
    feedEntryTable = Table("feed_entry", metadata,
        Column("pk", Integer, primary_key=True),
        Column("create_timestamp", DateTime, nullable=False),

        Column("id", String(255), nullable=False),
        Column("link", String(255), nullable=False),
        Column("title", String, nullable=False),
        Column("summary", String, nullable=False),
        Column("updated", DateTime),
        Column("feed_id", Integer, ForeignKey("feed.pk"))
    )

    metadata.create_all()

    mapper(FeedEntry, feedEntryTable)
    mapper(Feed, feedTable,
        properties = {
            "entries" : relation(FeedEntry, backref = "feed")
        }
    )