"""
Paste-style config coercion to Django-style config
"""

__id__ = "$Id$"

import new
from paste.deploy.converters import asbool, aslist

def coerce(global_settings, local_settings):
    """
    Coerce Paste-style config to Django-style settings
    """
    s = {}
    for setting in dir(global_settings):
        if setting == setting.upper():
            s[setting] = getattr(global_settings, setting)
    s.update(local_settings)
    s['DEBUG'] = asbool(s.get('DEBUG', 'false'))
    s['TEMPLATE_DEBUG'] = asbool(s.get('TEMPLATE_DEBUG', s['DEBUG']))
    s['USE_I18N'] = asbool(s.get('USE_I18N'))
    s['ADMINS'] = convert_name_list(s.get('ADMINS'))
    s['MANAGERS'] = convert_name_list(s.get('MANAGERS'))
    s['SITE_ID'] = int(s['SITE_ID'])
    s['TEMPLATE_LOADERS'] = convert_lines(s.get('TEMPLATE_LOADERS'))
    s['TEMPLATE_CONTEXT_PROCESSORS'] = convert_lines(s.get('TEMPLATE_CONTEXT_PROCESSORS'))
    s['MIDDLEWARE_CLASSES'] = convert_lines(s.get('MIDDLEWARE_CLASSES'))
    s['TEMPLATE_DIRS'] = convert_lines(s.get('TEMPLATE_DIRS'))
    s['INSTALLED_APPS'] = convert_lines(s.get('INSTALLED_APPS'))
    
    # Already okay:
    # DATABASE_ENGINE, DATABASE_NAME, DATABASE_USER,
    # DATABASE_PASSWORD, DATABASE_HOST, DATABASE_PORT
    # TIME_ZONE, LANGUAGE_CODE, MEDIA_ROOT, MEDIA_URL,
    # ADMIN_MEDIA_PREFIX, SECRET_KEY, ROOT_URLCONF

    # Should expand INSTALLED_APPS, SETTINGS_MODULE
    return s

def convert_lines(value):
    """
    Convert multiline value from Paste-config to list of string
    """
    if isinstance(value, (list, tuple)):
        return value
    return [x for x in aslist(value, sep='\n') if x and not x.startswith('#')]

def convert_name_list(value):
    """
    Convert multiline value from Paste-config to Django-style list of tuples
    """
    if isinstance(value, (list, tuple)):
        return value
    return [tuple([z.strip() for z in x.split(':', 1)])
                             for x in convert_lines(value)]

def make_module(attrs_dict, name=None):
    """
    Make new virual module
    """
    mod = new.module(name or '__settings__', "Virtual module for Django settings")
    for name, value in attrs_dict.items():
        setattr(mod, name, value)
    return mod