require 'json'

module VagrantPlugins
  module Salt
    class Provisioner < Vagrant.plugin("2", :provisioner)
      def provision
        upload_configs
        upload_keys
        run_bootstrap_script
        call_highstate
      end

      # Return a list of accepted keys
      def keys(group='minions')
        out = @machine.communicate.sudo("salt-key --out json") do |type, output|
          begin
            if type == :stdout
              out = JSON::load(output)
              break out[group]
            end
          end
        end
        return out
      end

      ## Utilities
      def expanded_path(rel_path)
        Pathname.new(rel_path).expand_path(@machine.env.root_path)
      end

      def binaries_found
        ## Determine States, ie: install vs configure
        desired_binaries = []
        if !@config.no_minion
          desired_binaries.push('salt-minion')
          desired_binaries.push('salt-call')
        end

        if @config.install_master
          desired_binaries.push('salt-master')
        end

        if @config.install_syndic
          desired_binaries.push('salt-syndic')
        end

        found = true
        for binary in desired_binaries
          @machine.env.ui.info "Checking if %s is installed" % binary
          if !@machine.communicate.test("which %s" % binary)
            @machine.env.ui.info "%s was not found." % binary
            found = false
          else
            @machine.env.ui.info "%s found" % binary
          end
        end

        return found
      end

      def need_configure
        @config.minion_config or @config.minion_key
      end

      def need_install
        if @config.always_install
          return true
        else
          return !binaries_found()
        end
      end

      def temp_config_dir
        return @config.temp_config_dir || "/tmp"
      end

      # Generates option string for bootstrap script
      def bootstrap_options(install, configure, config_dir)
        options = ""

        ## Any extra options passed to bootstrap
        if @config.bootstrap_options
          options = "%s %s" % [options, @config.bootstrap_options]
        end

        if configure
          options = "%s -c %s" % [options, config_dir]
        end

        if @config.seed_master and @config.install_master
          seed_dir = "/tmp/minion-seed-keys"
          @machine.communicate.sudo("mkdir -p -m777 #{seed_dir}")
          @config.seed_master.each do |name, keyfile|
            sourcepath = expanded_path(keyfile).to_s
            dest = "#{seed_dir}/seed-#{name}.pub"
            @machine.communicate.upload(sourcepath, dest)
          end
          options = "#{options} -k #{seed_dir}"
        end

        if configure and !install
          options = "%s -C" % options
        else

          if @config.install_master
            options = "%s -M" % options
          end



          if @config.install_syndic
            options = "%s -S" % options
          end

          if @config.no_minion
            options = "%s -N" % options
          end

          if @config.install_type
            options = "%s %s" % [options, @config.install_type]
          end

          if @config.install_args
            options = "%s %s" % [options, @config.install_args]
          end
        end

        if @config.verbose
          @machine.env.ui.info "Using Bootstrap Options: %s" % options
        end

        return options
      end

      ## Actions
      # Get pillar string to pass with the salt command
      def get_pillar
        " pillar='#{@config.pillar_data.to_json}'" if !@config.pillar_data.empty?
      end

      # Copy master and minion configs to VM
      def upload_configs
        if @config.minion_config
          @machine.env.ui.info "Copying salt minion config to vm."
          @machine.communicate.upload(expanded_path(@config.minion_config).to_s, temp_config_dir + "/minion")
        end

        if @config.master_config
          @machine.env.ui.info "Copying salt master config to vm."
          @machine.communicate.upload(expanded_path(@config.master_config).to_s, temp_config_dir + "/master")
        end
      end

      # Copy master and minion keys to VM
      def upload_keys
        if @config.minion_key and @config.minion_pub
          @machine.env.ui.info "Uploading minion keys."
          @machine.communicate.upload(expanded_path(@config.minion_key).to_s, temp_config_dir + "/minion.pem")
          @machine.communicate.upload(expanded_path(@config.minion_pub).to_s, temp_config_dir + "/minion.pub")
        end

        if @config.master_key and @config.master_pub
          @machine.env.ui.info "Uploading master keys."
          @machine.communicate.upload(expanded_path(@config.master_key).to_s, temp_config_dir + "/master.pem")
          @machine.communicate.upload(expanded_path(@config.master_pub).to_s, temp_config_dir + "/master.pub")
        end
      end

      # Get bootstrap file location, bundled or custom
      def get_bootstrap
        if @config.bootstrap_script
          bootstrap_abs_path = expanded_path(@config.bootstrap_script)
        else
          bootstrap_abs_path = Pathname.new("../bootstrap-salt.sh").expand_path(__FILE__)
        end

        return bootstrap_abs_path
      end

      # Determine if we are configure and/or installing, then do either
      def run_bootstrap_script
        install = need_install()
        configure = need_configure()
        config_dir = temp_config_dir()
        options = bootstrap_options(install, configure, config_dir)

        if configure or install
          if configure and !install
            @machine.env.ui.info "Salt binaries found. Configuring only."
          else
            @machine.env.ui.info "Bootstrapping Salt... (this may take a while)"
          end

          bootstrap_path = get_bootstrap
          bootstrap_destination = File.join(config_dir, "bootstrap_salt.sh")
          @machine.communicate.upload(bootstrap_path.to_s, bootstrap_destination)
          @machine.communicate.sudo("chmod +x %s" % bootstrap_destination)
          bootstrap = @machine.communicate.sudo("%s %s" % [bootstrap_destination, options]) do |type, data|
            if data[0] == "\n"
              # Remove any leading newline but not whitespace. If we wanted to
              # remove newlines and whitespace we would have used data.lstrip
              data = data[1..-1]
            end
            if @config.verbose
              @machine.env.ui.info(data.rstrip)
            end
          end

          if !bootstrap
            raise Salt::Errors::SaltError, :bootstrap_failed
          end

          if configure and !install
            @machine.env.ui.info "Salt successfully configured!"
          elsif configure and install
            @machine.env.ui.info "Salt successfully configured and installed!"
          elsif !configure and install
            @machine.env.ui.info "Salt successfully installed!"
          end
        else
          @machine.env.ui.info "Salt did not need installing or configuring."
        end
      end

      def call_highstate
        if @config.run_highstate
          @machine.env.ui.info "Calling state.highstate... (this may take a while)"
          if @config.install_master
            @machine.communicate.sudo("salt '*' saltutil.sync_all")
            @machine.communicate.sudo("salt '*' state.highstate --verbose#{get_pillar}") do |type, data|
              if @config.verbose
                @machine.env.ui.info(data)
              end
            end
          else
            @machine.communicate.sudo("salt-call saltutil.sync_all")
            @machine.communicate.sudo("salt-call state.highstate -l debug#{get_pillar}") do |type, data|
              if @config.verbose
                @machine.env.ui.info(data)
              end
            end
          end
        else
          @machine.env.ui.info "run_highstate set to false. Not running state.highstate."
        end
      end
    end
  end
end