# frozen_string_literal: true
#
# Author:: Paul Rossman (<paulrossman@google.com>)
# Author:: Chef Partner Engineering (<partnereng@chef.io>)
# Copyright:: Copyright 2015-2016 Google Inc., Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

require "chef/knife"
require "chef/knife/cloud/server/create_command"
require "chef/knife/cloud/server/create_options"
require_relative "cloud/google_service_options"

class Chef::Knife::Cloud
  class GoogleServerCreate < ServerCreateCommand
    include GoogleServiceOptions
    include ServerCreateOptions

    banner "knife google server create NAME -m MACHINE_TYPE -I IMAGE (options)"

    deps do
      require "gcewinpass"
      require_relative "cloud/google_service"
      require_relative "cloud/google_service_helpers"
      include GoogleServiceHelpers
    end

    option :machine_type,
      short:       "-m MACHINE_TYPE",
      long:        "--gce-machine-type MACHINE_TYPE",
      description: "The machine type of server (n1-highcpu-2, n1-highcpu-2-d, etc)"

    option :image,
      short:       "-I IMAGE",
      long:        "--gce-image IMAGE",
      description: "The Image for the server"

    option :image_project,
      long:        "--gce-image-project IMAGE_PROJECT",
      description: "The project-id containing the Image (debian-cloud, centos-cloud, etc)"

    option :boot_disk_name,
      long:        "--gce-boot-disk-name DISK",
      description: "Name of persistent boot disk; default is to use the server name"

    option :boot_disk_size,
      long:        "--gce-boot-disk-size SIZE",
      description: "Size of the persistent boot disk between 10 and 10000 GB, specified in GB; default is '10' GB",
      default:     "10"

    option :boot_disk_ssd,
      long:        "--[no-]gce-boot-disk-ssd",
      description: "Use pd-ssd boot disk; default is pd-standard boot disk",
      boolean:     true,
      default:     false

    option :boot_disk_autodelete,
      long:        "--[no-]gce-boot-disk-autodelete",
      description: "Delete boot disk when server is deleted.",
      boolean:     true,
      default:     true

    option :additional_disks,
      long:        "--gce-additional-disks DISKS",
      short:       "-D DISKS",
      description: "Names of additional disks, comma-separated, to attach to this server (NOTE: this will not create them)",
      proc:        Proc.new { |disks| disks.split(",") },
      default:     []

    option :auto_restart,
      long:        "--[no-]gce-auto-server-restart",
      description: "GCE can automatically restart your server if it is terminated for non-user-initiated reasons; enabled by default.",
      boolean:     true,
      default:     true

    option :auto_migrate,
      long:        "--[no-]gce-auto-server-migrate",
      description: "GCE can migrate your server to other hardware without downtime prior to periodic infrastructure maintenance, otherwise the server is terminated; enabled by default.",
      boolean:     true,
      default:     true

    option :preemptible,
      long:        "--[no-]gce-preemptible",
      description: "Create the instance as a preemptible instance, allowing GCE to shut it down at any time. Defaults to false.",
      boolean:     true,
      default:     false

    option :can_ip_forward,
      long:        "--[no-]gce-can-ip-forward",
      description: "Allow server network forwarding",
      boolean:     true,
      default:     false

    option :network,
      long:        "--gce-network NETWORK",
      description: "The network for this server; default is 'default'",
      default:     "default"

    option :subnet,
      long:        "--gce-subnet SUBNET",
      description: "The name of the subnet in the network on which to deploy the instance"

    option :tags,
      short:       "-T TAG1,TAG2,TAG3",
      long:        "--gce-tags TAG1,TAG2,TAG3",
      description: "Tags for this server",
      proc:        Proc.new { |tags| tags.split(",") },
      default:     []

    option :metadata,
      long:        "--gce-metadata Key=Value[,Key=Value...]",
      description: "Additional metadata for this server",
      proc:        Proc.new { |metadata| metadata.split(",") },
      default:     []

    option :service_account_scopes,
      long:        "--gce-service-account-scopes SCOPE1,SCOPE2,SCOPE3",
      proc:        Proc.new { |service_account_scopes| service_account_scopes.split(",") },
      description: "Service account scopes for this server",
      default:     []

    option :service_account_name,
      long:        "--gce-service-account-name NAME",
      description: "Service account name for this server, typically in the form of '123845678986@project.gserviceaccount.com'; default is 'default'",
      default:     "default"

    option :use_private_ip,
      long:        "--gce-use-private-ip",
      description: "if used, Chef will attempt to bootstrap the device using the private IP; default is disabled (use public IP)",
      boolean:     true,
      default:     false

    option :public_ip,
      long:        "--gce-public-ip IP_ADDRESS",
      description: "EPHEMERAL or static IP address or NONE; default is 'EPHEMERAL'",
      default:     "EPHEMERAL"

    option :gce_email,
      long:        "--gce-email EMAIL_ADDRESS",
      description: "email address of the logged-in Google Cloud user; required for bootstrapping windows hosts"

    option :local_ssd,
      long:        "--gce-local-ssd",
      description: "Local SSDs are physically attached to the server that hosts your VM instance. Local SSDs have higher throughput and lower latency than standard persistent disks or SSD persistent disks.",
      boolean:     true,
      default:     false

    option :interface,
      long: "--gce-interface INTERFACE",
      description: "The kind of disk interface exposed to the VM for this SSD. Valid values are SCSI and NVME. SCSI is the default and is supported by more guest operating systems. NVME may provide higher performance.",
      default: "scsi",
      in: %w{scsi nvme}

    option :number_of_local_ssd,
      long: "--gce-number-of-local-ssd NUMBER_OF_DISKS",
      description: "Specifies the number of local SSDs to be created per node. Each local SSD is 375 GB in size, but you can attach up to eight local SSD devices for 3 TB of total local SSD storage space per instance.",
      default: "1"

    def before_exec_command
      super

      @create_options = {
        name: instance_name,
        image: locate_config_value(:image),
        image_project: locate_config_value(:image_project),
        network: locate_config_value(:network),
        subnet: locate_config_value(:subnet),
        public_ip: locate_config_value(:public_ip),
        auto_migrate: auto_migrate?,
        auto_restart: auto_restart?,
        preemptible: preemptible?,
        boot_disk_autodelete: locate_config_value(:boot_disk_autodelete),
        boot_disk_name: locate_config_value(:boot_disk_name),
        boot_disk_size: boot_disk_size,
        boot_disk_ssd: locate_config_value(:boot_disk_ssd),
        additional_disks: locate_config_value(:additional_disks),
        local_ssd: locate_config_value(:local_ssd),
        interface: locate_config_value(:interface),
        number_of_local_ssd: number_of_local_ssd,
        can_ip_forward: locate_config_value(:can_ip_forward),
        machine_type: locate_config_value(:machine_type),
        service_account_scopes: locate_config_value(:service_account_scopes),
        service_account_name: locate_config_value(:service_account_name),
        metadata: metadata,
        tags: locate_config_value(:tags),
      }
    end

    def set_default_config
      # dumb hack for knife-cloud, which expects the user to pass in the WinRM password to use when bootstrapping.
      # We won't know the password until the instance is created and we forceably reset it.
      config[:connection_password] = "will_change_this_later"
    end

    def validate_params!
      check_for_missing_config_values!(:gce_zone, :machine_type, :image, :boot_disk_size, :network)
      raise "You must supply an instance name." if @name_args.first.nil?
      raise "Boot disk size must be between 10 and 10,000" unless valid_disk_size?(boot_disk_size)

      if locate_config_value(:connection_protocol) == "winrm" && locate_config_value(:gce_email).nil?
        raise "Please provide your Google Cloud console email address via --gce-email. " \
          "It is required when resetting passwords on Windows hosts."
      end

      raise "Please provide connection port via --connection-port." unless locate_config_value(:connection_port)
      raise "Please provide image os type via --image-os-type." unless locate_config_value(:image_os_type)

      ui.warn("Auto-migrate disabled for preemptible instance") if preemptible? && locate_config_value(:auto_migrate)
      ui.warn("Auto-restart disabled for preemptible instance") if preemptible? && locate_config_value(:auto_restart)

      super
    end

    def before_bootstrap
      super

      config[:chef_node_name] = locate_config_value(:chef_node_name) ? locate_config_value(:chef_node_name) : instance_name
      config[:bootstrap_ip_address] = ip_address_for_bootstrap

      if locate_config_value(:image_os_type) == "windows"
        ui.msg("Resetting the Windows login password so the bootstrap can continue...")
        config[:connection_password] = reset_windows_password
      end
    end

    # overriding this from Chef::Knife::Cloud::ServerCreateCommand.
    #
    # This gets called in validate_params! in that class before our #before_bootstrap
    # is called, in which it randomly generates a node name, which means we never default
    # to the instance name in our #before_bootstrap method. Instead, we'll just nil this
    # and allow our class here to do The Right Thing.
    def get_node_name(_name, _prefix)
      nil
    end

    def project
      locate_config_value(:gce_project)
    end

    def zone
      locate_config_value(:gce_zone)
    end

    def email
      locate_config_value(:gce_email)
    end

    def preemptible?
      locate_config_value(:preemptible)
    end

    def auto_migrate?
      preemptible? ? false : locate_config_value(:auto_migrate)
    end

    def auto_restart?
      preemptible? ? false : locate_config_value(:auto_restart)
    end

    def ip_address_for_bootstrap
      ip = locate_config_value(:use_private_ip) ? private_ip_for(server) : public_ip_for(server)

      raise "Unable to determine instance IP address for bootstrapping" if ip == "unknown"

      ip
    end

    def instance_name
      @name_args.first
    end

    def metadata
      locate_config_value(:metadata).each_with_object({}) do |item, memo|
        key, value = item.split("=")
        memo[key] = value
      end
    end

    def boot_disk_size
      locate_config_value(:boot_disk_size).to_i
    end

    def number_of_local_ssd
      locate_config_value(:number_of_local_ssd).to_i
    end

    def reset_windows_password
      GoogleComputeWindowsPassword.new(
        project:       project,
        zone:          zone,
        instance_name: instance_name,
        email:         email,
        username:      locate_config_value(:connection_user),
        debug:         gcewinpass_debug_mode
      ).new_password
    end

    def gcewinpass_debug_mode
      Chef::Config[:log_level] == :debug
    end
  end
end