require 'net/ssh'
require 'net/scp'

module Wordmove
  class RemoteHost < LocalHost

    alias :locally_run :run

    attr_reader :session

    def initialize(options = {})
      super
    end

    def session
      logger.verbose "Connecting to #{options.ssh.host}..." unless @session.present?
      @session ||= Net::SSH.start(options.ssh.host, options.ssh.username, @ssh_extras )
    end

    def close
      session.close
    end

    def upload_file(source_file, destination_file)
      logger.verbose "Copying remote #{source_file} to #{destination_file}..."
      Net::SSH.start options.ssh.host, options.ssh.username, @ssh_extras do |ssh|
        ssh.scp.download! source_file, destination_file
      end
    end

    def download_file(source_file, destination_file)
      logger.verbose "Copying local #{source_file} to #{destination_file}..."
      Net::SSH.start options.ssh.host, options.ssh.username, @ssh_extras do |ssh|
        ssh.scp.upload! source_file, destination_file
      end
    end

    def download_dir(source_dir, destination_dir)
      destination_dir = "#{options.ssh.host}:#{destination_dir}"
      destination_dir = "#{options.ssh.username}@#{destination_dir}" if options.ssh.username
      rsync "#{source_dir}/", destination_dir
    end

    def upload_dir(source_dir, destination_dir)
      source_dir = "#{options.ssh.host}:#{source_dir}/"
      source_dir = "#{options.ssh.username}@#{source_dir}" if options.ssh.username
      rsync source_dir, destination_dir
    end

    def run(*args)
      command = shell_command(*args)
      logger.verbose "Executing remotely #{command}"
      session.exec!(command)
    end

    private

    def rsync(source_dir, destination_dir)

      exclude_file = Tempfile.new('exclude')
      exclude_file.write(options.exclude.join("\n"))
      exclude_file.close

      arguments = [ "-azLK" ]

      if options.ssh && (options.ssh.port || options.ssh.password)

        remote_shell_arguments = [ "ssh" ]

        if options.ssh.port
          remote_shell_arguments << [ "-p", options.ssh.port ]
        end

        if options.ssh.password
          remote_shell_arguments = [ "sshpass", "-p", options.ssh.password ] + remote_shell_arguments
        end

        arguments << [ "-e", remote_shell_arguments.join(" ") ]
      end

      arguments <<  [ "--exclude-from=#{exclude_file.path}", "--delete", source_dir, destination_dir ]
      arguments.flatten!
      locally_run "rsync", *arguments

      exclude_file.unlink
    end

  end
end