require 'pg'

require 'common/postfixadmin_plugin'
require 'rm/rm_plugin'

class PostfixadminRm

  include PostfixadminPlugin
  include RmPlugin


  def delete_user(user)
    raise NonexistentUserError.new(user) if not user_exists(user)

    sql_queries = ['DELETE FROM alias WHERE address = $1;']
    # Wipe out any aliases pointed at our user.
    sql_queries << "UPDATE alias SET goto=REPLACE(goto, $1, '');"
    sql_queries << 'DELETE FROM mailbox WHERE username = $1;'
    sql_queries << 'DELETE FROM quota WHERE username = $1;'
    sql_queries << 'DELETE FROM quota2 WHERE username = $1;'
    sql_queries << 'DELETE FROM vacation WHERE email = $1;'

    # Should be handled by a trigger, according to PostfixAdmin code.
    sql_queries << 'DELETE FROM vacation_notification WHERE on_vacation = $1;'

    begin
      connection = PGconn.connect(@db_host,
                                  @db_port,
                                  @db_opts,
                                  @db_tty,
                                  @db_name,
                                  @db_user,
                                  @db_pass)

      sql_queries.each do |sql_query|
        connection.query(sql_query, [user])
      end

      # The earlier alias update query will leave things like
      # "foo@example.com,,bar@example.com" in the "goto" column. Now
      # we fix it. We don't do it in the loop because query() craps
      # out on the superfluous parameter.
      sql_query = "UPDATE alias SET goto=REPLACE(goto, ',,', ',');"
      connection.query(sql_query)

      connection.close()

    rescue PGError => e
      # Pretend like we're database-agnostic in case we ever are.
      raise DatabaseError.new(e)
    end
  end


  def delete_domain(domain)
    raise NonexistentDomainError.new(domain) if not domain_exists(domain)

    sql_queries = ['DELETE FROM domain_admins WHERE domain = $1;']
    sql_queries << 'DELETE FROM alias WHERE domain = $1;'
    sql_queries << 'DELETE FROM mailbox WHERE domain = $1;'
    sql_queries << 'DELETE FROM alias_domain WHERE alias_domain = $1;'
    sql_queries << 'DELETE FROM log WHERE domain = $1;'
    sql_queries << 'DELETE FROM vacation WHERE domain = $1;'
    sql_queries << 'DELETE FROM domain WHERE domain = $1;'

    begin
      connection = PGconn.connect(@db_host,
                                  @db_port,
                                  @db_opts,
                                  @db_tty,
                                  @db_name,
                                  @db_user,
                                  @db_pass)

      sql_queries.each do |sql_query|
        connection.query(sql_query, [domain])
      end

      connection.close()

    rescue PGError => e
      # Pretend like we're database-agnostic in case we ever are.
      raise DatabaseError.new(e)
    end

  end


  protected;

  def domain_exists(domain)
    count = 0

    # Just assume PostgreSQL for now.
    begin
      connection = PGconn.connect(@db_host,
                                  @db_port,
                                  @db_opts,
                                  @db_tty,
                                  @db_name,
                                  @db_user,
                                  @db_pass)

      sql_query = 'SELECT COUNT(domain) as count FROM domain WHERE domain = $1;'
      connection.query(sql_query, [domain]) do |result|
        return false if result.ntuples() < 1
        begin
          count = result.getvalue(0,0).to_i()
          return false if count.nil?
        rescue StandardError
          return false
        end
      end
      connection.close()
    rescue PGError => e
      # But pretend like we're database-agnostic in case we ever are.
      raise DatabaseError.new(e)
    end

    return (count > 0)
  end

end