import os

from mako.lookup import TemplateLookup
from pylons.configuration import PylonsConfig
from pylons.error import handle_mako_error

import containmentUnit.lib.app_globals as app_globals
import containmentUnit.lib.helpers
from containmentUnit.config.routing import make_map

def load_environment(global_conf, app_conf):
    """Configure the Pylons environment via the ``pylons.config`` object"""

    config = PylonsConfig()
    
    # Pylons paths
    root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    paths = dict(root=root,
                 controllers=os.path.join(root, "controllers"),
                 static_files=os.path.join(root, "public"),
                 templates=[os.path.join(root, "templates"),os.path.join(root,"public")])

    # Initialize config with the basic options
    config.init_app(global_conf, app_conf, package="containmentUnit", paths=paths)

    config["routes.map"] = make_map(config)
    config["pylons.app_globals"] = app_globals.Globals(config)
    config["pylons.h"] = containmentUnit.lib.helpers
    
    # Setup cache object as early as possible
    import pylons
    pylons.cache._push_object(config["pylons.app_globals"].cache)
    
    # Create the Mako TemplateLookup, with the default auto-escaping
    config["pylons.app_globals"].mako_lookup = TemplateLookup(
        directories = paths["templates"],
        error_handler = handle_mako_error,
        module_directory = os.path.join(app_conf["cache_dir"], "templates"),
        input_encoding = "utf-8",
        default_filters = ["escape"],
        imports = ["from webhelpers.html import escape"])

    return config
