require 'src/errors'
require 'src/filesystem'
require 'src/mailstore'

class DovecotMailstore < Mailstore

  def get_domains_from_filesystem()
    return Filesystem.get_subdirs(@domain_root)
  end


  def get_accounts_from_filesystem(domains)
    accounts = []

    domains.each do |domain|
      begin
        # Throws a NonexistentDomainError if the domain's path
        # doesn't exist on the filesystem. In this case, we want
        # to report zero accounts.
        domain_path = get_domain_path(domain)
        usernames = Filesystem.get_subdirs(domain_path)

        usernames.each do |username|
          accounts << "#{username}@#{domain}"
        end
      rescue NonexistentDomainError => e
        # Party hard.
      end
    end

    return accounts
  end


  def get_domain_path(domain)
    # Return the filesystem path for the given domain.
    # That is, the directory where its mail is stored.
    # Only works if the domain directory exists!
    domain_path = File.join(@domain_root, domain)

    if File.directory?(domain_path)
      return domain_path
    else
      raise NonexistentDomainError.new(domain_path)
    end
  end


  def get_account_path(account)
    # Return the filesystem path of this account's mailbox.
    # Only works if the account exists!
    if not account.include?('@')
      raise InvalidAccountError.new("#{account}: Accounts must contain an '@' symbol.")
    end

    account_parts = account.split('@')
    user_part = account_parts[0]
    domain_part = account_parts[1]

    domain_path = get_domain_path(domain_part)
    account_path = File.join(domain_path, user_part)

    if File.directory?(account_path)
      return account_path
    else
      raise NonexistentAccountError.new(account_path)
    end
  end

end