# Copyright (C) 2011-2012 RightScale, Inc, All Rights Reserved Worldwide.
#
# THIS PROGRAM IS CONFIDENTIAL AND PROPRIETARY TO RIGHTSCALE
# AND CONSTITUTES A VALUABLE TRADE SECRET. Any unauthorized use,
# reproduction, modification, or disclosure of this program is
# strictly prohibited. Any use of this program by an authorized
# licensee is strictly subject to the terms and conditions,
# including confidentiality obligations, set forth in the applicable
# License Agreement between RightScale.com, Inc. and
# the licensee

module RightConf

  class PackageInstaller

    include Singleton
    include ProgressReporter

    # Install given packages
    #
    # === Parameters
    # packages(String|Array):: Package name or Packages list
    # opts[:abort_on_failure](String):: Optional, abort configuration
    #   and display given error message if install fails when set
    # opts[:report](TrueClass|FalseClass):: Whether to report installation
    #
    # === Block
    # If a block is given it will get called with no argument prior to the
    # packages being installed. If the block returns true then installation
    # will proceed otherwise it won't. Use the block to check whether
    # installation is required or whether the packages are already installed.
    # If no block is given then installation will always occur.
    #
    # === Return
    # true:: Always return true
    def install(packages, opts=nil, &install_check)
      packages = [ packages ].flatten.compact
      return true if packages.empty?
      report = opts && opts.delete(:report)
      must_install = true
      if install_check
        report_check("Checking for #{packages.join(', ')}") if report
        must_install = install_check.call
        report_result(must_install) if report
      end
      if must_install
        report_check("Installing #{packages.join(', ')}") if report
        Platform.dispatch(packages, opts) { :install }
        report_success if report
      end
      true
    end

    protected

    # Install debian packages
    #
    # === Return
    # true:: Always return true
    def install_linux_ubuntu(packages, opts)
      return if packages.nil?
      args = packages.dup
      args << opts if opts
      Command.sudo('apt-get', 'install', '-y', *args)
    end
    alias :install_linux_debian :install_linux_ubuntu

    # Install yum packages
    #
    # === Return
    # true:: Always return true
    def install_linux_centos(packages, opts)
      return if packages.nil?
      args = packages.dup
      args << opts if opts
      Command.sudo('yum', 'install', '-y', *args)
    end
    alias :install_linux_redhat :install_linux_centos

    # Use brew on Mac OS X
    #
    # === Return
    # true:: Always return true
    def install_darwin(packages, opts)
      return if packages.nil?
      BrewInstaller.check_and_install
      packages.each do |p|
        args = [ p ]
        args << opts if opts
        res = Command.execute('brew', 'install', *args)
        installed = res.success? && res.output !~ /Formula already installed/
        Command.sudo('brew', 'link', p) if installed
      end
    end

    # Install Windows software
    #
    # === Return
    # true:: Always return true
    def install_windows(packages, opts)
      # TBD
    end

  end
end