#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2014 uralbash <root@uralbash.ru>
#
# Distributed under terms of the MIT license.

"""
Funny application demonstrates the capabilities of SQLAlchemy and Pyramid.
It is something between phpMyAdmin and django.contrib.admin. SQLAlchemy with
Pyramid mapped on existing Django generated database but not vice versa.

Requirements
------------

pip install pyramid, sqlalchemy
pip install git+https://github.com/ITCase/pyramid_sacrud.git@develop

Demonstration
-------------

python SQLAlchemyMyAdmin.py

goto http://localhost:8080/sacrud/
"""
from wsgiref.simple_server import make_server

from pyramid.config import Configurator
from sqlalchemy import engine_from_config, MetaData
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker
from zope.sqlalchemy import ZopeTransactionExtension

DBSession = scoped_session(sessionmaker(extension=ZopeTransactionExtension()))
Base = declarative_base()


def get_metadata(engine):
    # produce our own MetaData object
    metadata = MetaData()
    metadata.reflect(engine)
    # we can then produce a set of mappings from this MetaData.
    Base = automap_base(metadata=metadata)
    # calling prepare() just sets up mapped classes and relationships.
    Base.prepare()
    return metadata


def quick_mapper(table):
    class GenericMapper(Base):
        __table__ = table
        __tablename__ = table.name
    return GenericMapper


def get_app():
    config = Configurator()
    settings = config.registry.settings
    settings['sqlalchemy.url'] = "postgresql://postgres:postgres@localhost/your_database_name"

    # Database
    engine = engine_from_config(settings)
    DBSession.configure(bind=engine)
    metadata = get_metadata(engine)
    tables = [quick_mapper(table) for table in metadata.sorted_tables]

    # SACRUD
    settings['pyramid_sacrud.models'] = (
        ('tables', tables),
    )
    config.include('ps_alchemy')  # for pyramid_sacrud >= 0.3.0 version
    config.include('pyramid_sacrud')

    return config.make_wsgi_app()

if __name__ == '__main__':
    app = get_app()
    server = make_server('0.0.0.0', 8080, app)
    server.serve_forever()