# Adhearsion, open source technology integrator
# Copyright 2006 Jay Phillips
# 
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

class Definition

  def initialize(*constraints)
    @options = {}
    if constraints then @constraints = constraints.flatten!
    else @constraints = []
    end
  end

  attr_reader :options

  # The method_missing method is a crown-jewel of Ruby. When a method is
  # called on an object that doesn't exist, Ruby will invoke the method_missing
  # method. The Kernel module holds the initial definition of this method and
  # the Ruby interpreter raises a NameError when Kernel#method_missing is
  # invoked.
  def method_missing(name, *args)
    # Let's ensure the names stay simple
    super unless name.to_s =~ /^[a-z][\w_]*=?$/i || args.empty?
    @options[name] = args.simplify
  end
end

# The user(), group() and use_users_and_group() methods are presently alpha and
# really shouldn't be used yet. They're experimental ways of establishing user
# and group objects in the database.rb file.

def user &options
  establish_connection :internal
  her = Definition.new
  yield her
  User.create her.options
end

def group &options
  establish_connection :internal
  her = Definition.new
  yield her
  Group.create her.options
end

def use_users_and_groups clause
  estabish_connection :external
  case clause.class.inspect.to_sym
  when :Hash
    group_table = clause[:from].delete :group_table
    user_table = clause[:from].delete :user_table
    # XXX: Note: User.table doesn't exist! Needs fixing!
    User.table = user_table if user_table
    Group.table = group_table if group_table

    establish_connection :external, clause[:from]
  when :String || :File
    clause = File.open clause, 'a' if clause.is_a? String
    raise ArgumentError.new("Not a directory!") unless clause.directory?
  else raise ArgumentError.new("Wrong argument type!")
  end
end
alias use_groups_and_users  use_users_and_groups