class Company < ActiveRecord::Base
  attr_protected :rating
  set_sequence_name :companies_nonstd_seq

  validates_presence_of :name
end


class Firm < Company
  has_many :clients, :order => "id", :dependent => true, :counter_sql =>
      "SELECT COUNT(*) FROM companies WHERE firm_id = 1 " +
      "AND (#{QUOTED_TYPE} = 'Client' OR #{QUOTED_TYPE} = 'SpecialClient' OR #{QUOTED_TYPE} = 'VerySpecialClient' )"
  has_many :clients_sorted_desc, :class_name => "Client", :order => "id DESC"
  has_many :clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id"
  has_many :dependent_clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id", :dependent => true
  has_many :exclusively_dependent_clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id", :exclusively_dependent => true
  has_many :limited_clients, :class_name => "Client", :order => "id", :limit => 1
  has_many :clients_like_ms, :conditions => "name = 'Microsoft'", :class_name => "Client", :order => "id"
  has_many :clients_using_sql, :class_name => "Client", :finder_sql => 'SELECT * FROM companies WHERE client_of = #{id}'
  has_many :clients_using_counter_sql, :class_name => "Client",
           :finder_sql  => 'SELECT * FROM companies WHERE client_of = #{id}',
           :counter_sql => 'SELECT COUNT(*) FROM companies WHERE client_of = #{id}'
  has_many :clients_using_zero_counter_sql, :class_name => "Client",
           :finder_sql  => 'SELECT * FROM companies WHERE client_of = #{id}',
           :counter_sql => 'SELECT 0 FROM companies WHERE client_of = #{id}'
  has_many :no_clients_using_counter_sql, :class_name => "Client",
           :finder_sql  => 'SELECT * FROM companies WHERE client_of = 1000',
           :counter_sql => 'SELECT COUNT(*) FROM companies WHERE client_of = 1000'

  has_one :account, :foreign_key => "firm_id", :dependent => true
end

class DependentFirm < Company
  has_one :account, :foreign_key => "firm_id", :dependent => :nullify
  has_many :companies, :foreign_key => 'client_of', :order => "id", :dependent => :nullify
end


class Client < Company
  belongs_to :firm, :foreign_key => "client_of"
  belongs_to :firm_with_basic_id, :class_name => "Firm", :foreign_key => "firm_id"
  belongs_to :firm_with_other_name, :class_name => "Firm", :foreign_key => "client_of"
  belongs_to :firm_with_condition, :class_name => "Firm", :foreign_key => "client_of", :conditions => "1 = 1"

  # Record destruction so we can test whether firm.clients.clear has
  # is calling client.destroy, deleting from the database, or setting
  # foreign keys to NULL.
  def self.destroyed_client_ids
    @destroyed_client_ids ||= Hash.new { |h,k| h[k] = [] }
  end

  before_destroy do |client|
    if client.firm
      Client.destroyed_client_ids[client.firm.id] << client.id
    end
    true
  end
end


class SpecialClient < Client
end

class VerySpecialClient < SpecialClient
end

class Account < ActiveRecord::Base
  belongs_to :firm
  
  protected
    def validate
      errors.add_on_empty "credit_limit"
    end
end