#
# Functions for interacting with the roles table in the database
#
# Mark Huang <mlhuang@cs.princeton.edu>
# Copyright (C) 2006 The Trustees of Princeton University
#
# $Id: Roles.py,v 1.5 2006/10/20 17:53:54 mlhuang Exp $
#

from types import StringTypes
from PLC.Faults import *
from PLC.Parameter import Parameter
from PLC.Table import Row, Table

class Role(Row):
    """
    Representation of a row in the roles table. To use,
    instantiate with a dict of values.
    """

    table_name = 'roles'
    primary_key = 'role_id'
    join_tables = ['person_role', ('slice_attribute_types', 'min_role_id')]
    fields = {
        'role_id': Parameter(int, "Role identifier"),
        'name': Parameter(str, "Role", max = 100),
        }

    def validate_role_id(self, role_id):
	# Make sure role does not already exist
	conflicts = Roles(self.api, [role_id])
        if conflicts:
            raise PLCInvalidArgument, "Role ID already in use"

        return role_id

    def validate_name(self, name):
	# Make sure name is not blank
        if not len(name):
            raise PLCInvalidArgument, "Role must be specified"
	
	# Make sure role does not already exist
	conflicts = Roles(self.api, [name])
        if conflicts:
            raise PLCInvalidArgument, "Role name already in use"

	return name

class Roles(Table):
    """
    Representation of the roles table in the database.
    """

    def __init__(self, api, role_id_or_name_list = None):
        sql = "SELECT %s FROM roles" % \
              ", ".join(Role.fields)
        
        if role_id_or_name_list:
            # Separate the list into integers and strings
            role_ids = filter(lambda role_id: isinstance(role_id, (int, long)),
                                   role_id_or_name_list)
            names = filter(lambda name: isinstance(name, StringTypes),
                           role_id_or_name_list)
            sql += " WHERE (False"
            if role_ids:
                sql += " OR role_id IN (%s)" % ", ".join(map(str, role_ids))
            if names:
                sql += " OR name IN (%s)" % ", ".join(api.db.quote(names))
            sql += ")"

        rows = api.db.selectall(sql)

        for row in rows:
            self[row['role_id']] = Role(api, row)