#!/usr/bin/env ruby
# frozen_string_literal: true

require 'pwn'
require 'optparse'
require 'yaml'

opts = {}
OptionParser.new do |options|
  options.banner = "USAGE:
    #{$PROGRAM_NAME} [opts]
  "

  options.on('-cYPATH', '--yaml-config=YPATH', '<Required - YAML Config Containing Access & Secret Keys for Authentication, Including Credential Information for Scan Creation (https://developer.tenable.com/docs/determine-settings-for-credential-type)>') do |c|
    opts[:yaml_config] = c
  end

  options.on('-nNAME', '--scan-name=NAME', '<Required - YAML Name of Scan to Create>') do |n|
    opts[:scan_name] = n
  end

  options.on('-TTARGETS', '--text-targets=TARGETS', '<Required - Comma-delimited list of targets to scan>') do |t|
    opts[:text_targets] = t
  end

  options.on('-dDESC', '--scan-description=DESC', '<Optional - Scan Description (Defaults to nil)>') do |d|
    opts[:scan_desc] = d
  end

  options.on('-eEMAILS', '--emails=EMAILS', '<Optional - Comma-delimited list of email addresses that receive the email summary report>') do |e|
    opts[:emails] = e
  end

  options.on('-tVALUE', '--scan-template=VALUE', '<Optional - Canned Scan Template to Use for Scan Creation (Defaults to "Basic Network Scan">') do |t|
    opts[:scan_template_name] = t
  end

  options.on('-pPOLICY', '--policy-name=POLICY', '<Optional - Policy to Use to Create the Scan>') do |p|
    opts[:policy_name] = p
  end

  options.on('-fFOLDER', '--folder-name=FOLDER', '<Optional - Where to Store the Scan (Defaults to "My Scans")>') do |f|
    opts[:folder_name] = f
  end

  options.on('-sSCANNER', '--scanner-name=SCANNER', '<Optional - Scanner to Use (Defaults to "AUTO-ROUTED")>') do |s|
    opts[:scanner_name] = s
  end

  options.on('-D', '--disable-scan', '<Optional - If true, the schedule for the scan is disabled (Defaults to false)>') do |d|
    opts[:disabled] = d
  end

  options.on('-NTARGET', '--target-network-name=TARGET', '<Optional - If --scanner other than AUTO-ROUTED, Otherwise Required - Network to Scan (Defaults to "Default")>') do |n|
    opts[:target_network_name] = n
  end

  options.on('-lWHEN', '--launch=WHEN', '<Optional - When to Launch Scan - ON_DEMAND || DAILY || WEEKLY || MONTHLY || YEARLY (Defaults to "ON_DEMAND")>') do |l|
    opts[:launch] = l
  end

  options.on('-wTIMEWINDOW', '--scan-time-window=TIMEWINDOW', '<Optional - Scan Time Window in Minutes (Defaults to 0)>') do |t|
    opts[:scan_time_window] = t
  end

  options.on('-STIME', '--start-time=TIME', '<Optional - For One-Time Scans, the Starting Time and Date for the Scan (Defaults to Time.now.strftime("%Y%m%dT%H%M%S")>') do |t|
    opts[:starttime] = t
  end

  options.on('-rRRULES', '--rrules=RRULES', '<Optional - For One-Time Scans, the Starting Time and Date for the Scan (Defaults to "FREQ=null;INTERVAL=0;BYDAY=null")>') do |r|
    opts[:rrules] = r
  end

  options.on('-xTAGS', '--tag-targets=TAGS', '<Optional - Comma-delimited list of tags to add to targets in scan>') do |x|
    opts[:tag_targets] = x
  end

  options.on('-yCATEGORY', '--tag-category-name=CATEGORY', '<Optional - Tag Category Name to Associate with --tag-targets flag>') do |y|
    opts[:tag_category_name] = y
  end

  options.on('-zTIMEZONE', '--timezone=TIMEZONE', '<Optional - Timezone of the scheduled start time for the scan (Defaults to "UTC")>') do |t|
    opts[:timezone] = t
  end

  options.on('-gGROUPS', '--target-groups=GROUPS', '<Optional - Comma-delimited list of target group IDs to scan>') do |t|
    opts[:timezone] = t
  end
end.parse!

if opts.empty?
  puts `#{$PROGRAM_NAME} --help`
  exit 1
end

begin
  # Get Options Passed to pwn_nessus_cloud_create_scan
  # Required Arguments
  yaml_config = opts[:yaml_config]

  raise "YAML Config Not Found: #{yaml_config}" unless File.exist?(yaml_config)

  yaml = YAML.load_file(
    yaml_config,
    symbolize_names: true
  )

  access_key = yaml[:access_key]
  secret_key = yaml[:secret_key]

  scan_name = opts[:scan_name]

  text_targets = opts[:text_targets]
  raise 'ERROR: --text-targets (i.e. List of targets to scan) is required.' unless text_targets

  # Optional Arguments
  scan_desc = opts[:scan_desc]

  scan_template_name = opts[:scan_template_name]
  scan_template_name ||= 'Basic Network Scan'

  policy_name = opts[:policy_name]
  policy_name ||= ''

  folder_name = opts[:folder_name]
  folder_name ||= 'My Scans'

  scanner_name = opts[:scanner_name]
  scanner_name ||= 'AUTO-ROUTED'

  target_network_name = opts[:target_network_name]
  target_network_name ||= 'Default'

  disabled = true if opts[:disabled]
  disabled ||= false

  enabled = true
  enabled = false if disabled

  launch = opts[:launch]
  launch ||= 'ON_DEMAND'

  scan_time_window = opts[:scan_time_window].to_i
  scan_time_window ||= 0

  starttime = opts[:starttime]
  starttime ||= Time.now.strftime('%Y%m%dT%H%M%S')

  rrules = opts[:rrules]
  rrules ||= 'FREQ=null;INTERVAL=0;BYDAY=null'

  timezone = opts[:timezone]
  timezone ||= 'UTC'

  target_groups = opts[:target_groups]

  file_targets = opts[:file_targets]

  tag_targets = opts[:tag_targets]
  tag_targets_arr = []
  tag_targets_arr = tag_targets.split(',') if tag_targets

  tag_category_name = opts[:tag_category_name]
  raise 'ERROR: --tag-category-name Required as --tag-targets is Populated' if tag_targets && !tag_category_name

  agent_group_name = opts[:agent_group_name]
  agent_group_id_arr = []

  agent_scan_launch_type = opts[:agent_scan_launch_type]
  agent_scan_launch_type ||= 'triggered'

  triggers_arr = []
  triggers = {}
  triggers[:type] = agent_scan_launch_type
  triggers[:type] ||= 'periodic'

  triggers[:options] = {}
  case agent_scan_launch_type
  when 'periodic'
    triggers[:options][:periodic_hourly_interval] = opts[:periodic_hourly_interval]
    triggers[:options][:periodic_hourly_interval] ||= 0
  when 'file-exists'
    triggers[:options][:filename] = opts[:filename]
  end

  triggers_arr.push(triggers)

  emails = opts[:emails]

  acls = {}
  acls[:permissions] = opts[:acl_permissions]
  acls[:owner] = opts[:acl_owner]
  acls[:display_name] = opts[:acl_display_name]
  acls[:name] = opts[:acl_name]
  acls[:id] = opts[:acl_id]
  acls[:type] = opts[:acl_type]

  credential_category = opts[:credential_category]
  credential_type = opts[:credential_type]

  # Begin Here
  nessus_obj = PWN::Plugins::NessusCloud.login(
    access_key: access_key,
    secret_key: secret_key
  )

  # Requirements to update / create a scan:
  # Part 1: Populate uuid
  # Part 2: Populate settings object from options passed to driver
  # Part 3: Populate credentials object from YAML config (optional)
  # Part 4: Populate plugins object from YAML config (optional)
  # Part 5: Update Scan if it exists, or create it.

  # Part 1: Populate uuid
  # TODO: add --list-canned-scan-templates option
  scan_template = PWN::Plugins::NessusCloud.get_canned_scan_templates(
    nessus_obj: nessus_obj,
    name: scan_template_name
  )
  scan_template_uuid = scan_template[:uuid]

  # Part 2: Populate settings object from options passed to driver
  settings = {}
  settings[:name] = scan_name
  settings[:description] = scan_desc if scan_desc

  policy = PWN::Plugins::NessusCloud.get_policies(
    nessus_obj: nessus_obj,
    name: policy_name
  )
  settings[:policy_id] = policy[:id]

  folder = PWN::Plugins::NessusCloud.get_folders(
    nessus_obj: nessus_obj,
    name: folder_name
  )
  settings[:folder_id] = folder[:id]

  scanner = PWN::Plugins::NessusCloud.get_scanners(
    nessus_obj: nessus_obj,
    name: scanner_name
  )
  settings[:scanner_id] = scanner[:id]

  target_network = PWN::Plugins::NessusCloud.get_target_networks(
    nessus_obj: nessus_obj,
    name: target_network_name
  )
  settings[:target_network_uuid] = target_network[:uuid]

  settings[:enabled] = enabled

  settings[:launch] = launch

  settings[:scan_time_window] = scan_time_window

  settings[:starttime] = starttime

  settings[:rrules] = rrules

  settings[:timezone] = timezone

  settings[:text_targets] = text_targets

  # Example array on https://developer.tenable.com/reference/scans-create is really just a string.
  settings[:target_groups] = "[#{target_groups}]" if target_groups

  settings[:file_targets] = file_targets if file_targets

  if tag_targets_arr.any?
    tag_uuids_arr = []
    tag_targets_arr.each do |tag_name|
      # Lookup tag and create if does not exist
      tag = PWN::Plugins::NessusCloud.get_tag_values(
        nessus_obj: nessus_obj,
        name: tag_name
      )
      tag_uuid = tag[:uuid] if tag.any?
      tag_uuids_arr.push(tag_uuid) if tag.any?
      next if tag.any?

      new_tag = PWN::Plugins::NessusCloud.create_tag(
        nessus_obj: nessus_obj,
        category: tag_category_name,
        value: tag_name
      )
      tag_uuid = new_tag[:uuid]
      tag_uuids_arr.push(tag_uuid)
    end

    settings[:tag_targets] = tag_uuids_arr
  end

  settings[:agent_group_id] = agent_group_id_arr if agent_group_id_arr.any?

  settings[:agent_scan_launch_type] = agent_scan_launch_type if agent_scan_launch_type

  settings[:triggers] = triggers_arr if triggers_arr.any?

  settings[:emails] = emails if emails

  # settings[:acls] = acls if acls

  # Part 3: Populate credentials object from YAML config (optional)
  credentials = yaml[:credentials] if yaml[:credentials]

  # Part 4: Populate plugins object from YAML config (optional)
  plugins = yaml[:plugins] if yaml[:plugins]

  # Part 5: Update Scan if it exists, or create it.
  scan = PWN::Plugins::NessusCloud.get_scans(
    nessus_obj: nessus_obj,
    name: scan_name
  )
  if scan.any?
    scan_id = scan[:id]
    update_scan_resp = PWN::Plugins::NessusCloud.update_scan(
      nessus_obj: nessus_obj,
      scan_id: scan_id,
      scan_template_uuid: scan_template_uuid,
      settings: settings,
      credentials: credentials,
      plugins: plugins
    )

    puts update_scan_resp.inspect
  else
    create_scan_resp = PWN::Plugins::NessusCloud.create_scan(
      nessus_obj: nessus_obj,
      scan_template_uuid: scan_template_uuid,
      settings: settings,
      credentials: credentials,
      plugins: plugins
    )

    puts create_scan_resp.inspect
  end
rescue Interrupt
  puts 'CTRL+C detected...goodbye.'
rescue StandardError => e
  raise e
end