require "log4r"

module VagrantPlugins
  module Puppet
    module Provisioner
      class PuppetError < Vagrant::Errors::VagrantError
        error_namespace("vagrant.provisioners.puppet")
      end

      class Puppet < Vagrant.plugin("1", :provisioner)
        class Config < Vagrant.plugin("1", :config)
          attr_accessor :manifest_file
          attr_accessor :manifests_path
          attr_accessor :module_path
          attr_accessor :pp_path
          attr_accessor :options
          attr_accessor :facter

          def manifest_file; @manifest_file || "default.pp"; end
          def manifests_path; @manifests_path || "manifests"; end
          def pp_path; @pp_path || "/tmp/vagrant-puppet"; end
          def options; @options ||= []; end
          def facter; @facter ||= {}; end

          # Returns the manifests path expanded relative to the root path of the
          # environment.
          def expanded_manifests_path(root_path)
            Pathname.new(manifests_path).expand_path(root_path)
          end

          # Returns the module paths as an array of paths expanded relative to the
          # root path.
          def expanded_module_paths(root_path)
            return [] if !module_path

            # Get all the paths and expand them relative to the root path, returning
            # the array of expanded paths
            paths = module_path
            paths = [paths] if !paths.is_a?(Array)
            paths.map do |path|
              Pathname.new(path).expand_path(root_path)
            end
          end

          def validate(env, errors)
            # Calculate the manifests and module paths based on env
            this_expanded_manifests_path = expanded_manifests_path(env.root_path)
            this_expanded_module_paths = expanded_module_paths(env.root_path)

            # Manifests path/file validation
            if !this_expanded_manifests_path.directory?
              errors.add(I18n.t("vagrant.provisioners.puppet.manifests_path_missing",
                                :path => this_expanded_manifests_path))
            else
              expanded_manifest_file = this_expanded_manifests_path.join(manifest_file)
              if !expanded_manifest_file.file?
                errors.add(I18n.t("vagrant.provisioners.puppet.manifest_missing",
                                  :manifest => expanded_manifest_file.to_s))
              end
            end

            # Module paths validation
            this_expanded_module_paths.each do |path|
              if !path.directory?
                errors.add(I18n.t("vagrant.provisioners.puppet.module_path_missing", :path => path))
              end
            end
          end
        end

        def self.config_class
          Config
        end

        def initialize(env, config)
          super

          @logger = Log4r::Logger.new("vagrant::provisioners::puppet")
        end

        def prepare
          # Calculate the paths we're going to use based on the environment
          @expanded_manifests_path = config.expanded_manifests_path(env[:root_path])
          @expanded_module_paths   = config.expanded_module_paths(env[:root_path])
          @manifest_file           = File.join(manifests_guest_path, config.manifest_file)

          set_module_paths
          share_manifests
          share_module_paths
        end

        def provision!
          # Check that the shared folders are properly shared
          check = [manifests_guest_path]
          @module_paths.each do |host_path, guest_path|
            check << guest_path
          end

          verify_shared_folders(check)

          # Verify Puppet is installed and run it
          verify_binary("puppet")
          run_puppet_apply
        end

        def share_manifests
          env[:machine].config.vm.share_folder("manifests", manifests_guest_path, @expanded_manifests_path)
        end

        def share_module_paths
          count = 0
          @module_paths.each do |from, to|
            # Sorry for the cryptic key here, but VirtualBox has a strange limit on
            # maximum size for it and its something small (around 10)
            env[:machine].config.vm.share_folder("v-pp-m#{count}", to, from)
            count += 1
          end
        end

        def set_module_paths
          @module_paths = []
          @expanded_module_paths.each_with_index do |path, i|
            @module_paths << [path, File.join(config.pp_path, "modules-#{i}")]
          end
        end

        def manifests_guest_path
          File.join(config.pp_path, "manifests")
        end

        def verify_binary(binary)
          env[:machine].communicate.sudo("which #{binary}",
                                         :error_class => PuppetError,
                                         :error_key => :not_detected,
                                         :binary => binary)
        end

        def run_puppet_apply
          options = [config.options].flatten
          module_paths = @module_paths.map { |_, to| to }
          options << "--modulepath '#{module_paths.join(':')}'" if !@module_paths.empty?
          options << @manifest_file
          options = options.join(" ")

          # Build up the custom facts if we have any
          facter = ""
          if !config.facter.empty?
            facts = []
            config.facter.each do |key, value|
              facts << "FACTER_#{key}='#{value}'"
            end

            facter = "#{facts.join(" ")} "
          end

          command = "cd #{manifests_guest_path} && #{facter}puppet apply #{options}"

          env[:ui].info I18n.t("vagrant.provisioners.puppet.running_puppet",
                               :manifest => @manifest_file)

          env[:machine].communicate.sudo(command) do |type, data|
            env[:ui].info(data.chomp, :prefix => false)
          end
        end

        def verify_shared_folders(folders)
          folders.each do |folder|
            @logger.debug("Checking for shared folder: #{folder}")
            if !env[:machine].communicate.test("test -d #{folder}")
              raise PuppetError, :missing_shared_folders
            end
          end
        end
      end
    end
  end
end