Puppet::Type.type(:package).provide :zypper, :parent => :rpm, :source => :rpm do
  desc "Support for SuSE `zypper` package manager. Found in SLES10sp2+ and SLES11.

    This provider supports the `install_options` attribute, which allows command-line flags to be passed to zypper.
    These options should be specified as an array where each element is either a 
    string or a hash."

  has_feature :versionable, :install_options, :virtual_packages

  commands :zypper => "/usr/bin/zypper"

  defaultfor :operatingsystem => [:suse, :sles, :sled, :opensuse]
  confine    :operatingsystem => [:suse, :sles, :sled, :opensuse]

  # @api private
  # Reset the latest version hash to nil
  # needed for spec tests to clear cached value
  def self.reset!
    @latest_versions = nil
  end

  def self.latest_package_version(package)
    if @latest_versions.nil?
      @latest_versions = list_updates
    end

    @latest_versions[package]
  end

  def self.list_updates
    output = zypper 'list-updates'

    avail_updates = {}

    # split up columns
    output.lines.each do |line|
      pkg_ver = line.split(/\s*\|\s*/)
      # ignore zypper headers
      next unless pkg_ver[0] == 'v'
      avail_updates[pkg_ver[2]] = pkg_ver[4]
    end

    avail_updates
  end

  #on zypper versions <1.0, the version option returns 1
  #some versions of zypper output on stderr
  def zypper_version
    cmd = [self.class.command(:zypper),"--version"]
    execute(cmd, { :failonfail => false, :combine => true})
  end

  # Install a package using 'zypper'.
  def install
    should = @resource.should(:ensure)
    self.debug "Ensuring => #{should}"
    wanted = @resource[:name]

    # XXX: We don't actually deal with epochs here.
    case should
    when true, false, Symbol
      should = nil
    else
      # Add the package version
      wanted = "#{wanted}-#{should}"
    end

    #This has been tested with following zypper versions
    #SLE 10.4: 0.6.201
    #SLE 11.3: 1.6.307
    #SLE 12.0: 1.11.14
    #Assume that this will work on newer zypper versions

    #extract version numbers and convert to integers
    major, minor, patch = zypper_version.scan(/\d+/).map{ |x| x.to_i }
    self.debug "Detected zypper version #{major}.#{minor}.#{patch}"

    #zypper version < 1.0 does not support --quiet flag
    if major < 1
      quiet = '--terse'
    else
      quiet = '--quiet'
    end

    inst_opts = []
    inst_opts = install_options if resource[:install_options]


    options = []
    options << quiet
    options << '--no-gpg-check' unless inst_opts.delete('--no-gpg-check').nil?
    options << :install

    #zypper 0.6.13 (OpenSuSE 10.2) does not support auto agree with licenses
    options << '--auto-agree-with-licenses' unless major < 1 and minor <= 6 and patch <= 13
    options << '--no-confirm'
    options += inst_opts unless inst_opts.empty?

    # Zypper 0.6.201 doesn't recognize '--name'
    # It is unclear where this functionality was introduced, but it
    # is present as early as 1.0.13
    options << '--name' unless major < 1 || @resource.allow_virtual? || should
    options << wanted

    zypper(*options)

    unless self.query
      raise Puppet::ExecutionFailure.new(
        _("Could not find package %{name}") % { name: self.name }
      )
    end
  end

  # What's the latest package version available?
  def latest
    return self.class.latest_package_version(@resource[:name]) ||
      # zypper didn't find updates, pretend the current
      # version is the latest
      @property_hash[:ensure]
  end

  def update
    # zypper install can be used for update, too
    self.install
  end

  def uninstall
    #extract version numbers and convert to integers
    major, minor, _ = zypper_version.scan(/\d+/).map{ |x| x.to_i }

    if major < 1
      super
    else
      options = [:remove, '--no-confirm']
      if major == 1 && minor < 6
          options << '--force-resolution'
      end

      options << @resource[:name]

      zypper(*options)
    end

  end
end