#!/usr/bin/env ruby

# Arvados cli client
#
# Ward Vandewege <ward@clinicalfuture.com>

if RUBY_VERSION < '1.9.3' then
  abort <<-EOS
#{$0.gsub(/^\.\//,'')} requires Ruby version 1.9.3 or higher.
  EOS
end

# read authentication data from ~/.arvados if present
lineno = 0
config_file = File.expand_path('~/.arvados')
if File.exist? config_file then
  File.open(config_file, 'r').each do |line|
    lineno = lineno + 1
    # skip comments
    if line.match('^\s*#') then
      next
    end
    var, val = line.chomp.split('=', 2)
    # allow environment settings to override config files.
    if var and val
      ENV[var] ||= val
    else
      warn "#{config_file}: #{lineno}: could not parse `#{line}'"
    end
  end
end

case ARGV[0]
when 'keep'
  ARGV.shift
  @sub = ARGV.shift
  if ['get', 'put'].index @sub then
    # Native Arvados
    exec `which arv-#{@sub}`.strip, *ARGV
  elsif ['ls', 'less', 'check'].index @sub then
    # wh* shims
    exec `which wh#{@sub}`.strip, *ARGV
  else
    puts "Usage: \n" +
      "#{$0} keep ls\n" +
      "#{$0} keep get\n" +
      "#{$0} keep put\n" +
      "#{$0} keep less\n" +
      "#{$0} keep check\n"
  end
  abort
when 'pipeline'
  ARGV.shift
  @sub = ARGV.shift
  if ['run'].index @sub then
    exec `which arv-run-pipeline-instance`.strip, *ARGV
  else
    puts "Usage: \n" +
      "#{$0} pipeline run [...]\n" +
      "(see arv-run-pipeline-instance --help for details)\n"
  end
  abort
when 'tag'
  ARGV.shift
  exec `which arv-tag`.strip, *ARGV
end

ENV['ARVADOS_API_VERSION'] ||= 'v1'

if not ENV.include?('ARVADOS_API_HOST') or not ENV.include?('ARVADOS_API_TOKEN') then
  abort <<-EOS
ARVADOS_API_HOST and ARVADOS_API_TOKEN need to be defined as environment variables.
  EOS
end

begin
  require 'curb'
  require 'rubygems'
  require 'google/api_client'
  require 'json'
  require 'pp'
  require 'trollop'
  require 'andand'
  require 'oj'
  require 'active_support/inflector'
  require 'yaml'
rescue LoadError
  abort <<-EOS

Please install all required gems: 

  gem install activesupport andand curb google-api-client json oj trollop

  EOS
end

ActiveSupport::Inflector.inflections do |inflect|
  inflect.irregular 'specimen', 'specimens'
  inflect.irregular 'human', 'humans'
end

module Kernel
  def suppress_warnings
    original_verbosity = $VERBOSE
    $VERBOSE = nil
    result = yield
    $VERBOSE = original_verbosity
    return result
  end
end

# do this if you're testing with a dev server and you don't care about SSL certificate checks:
if ENV['ARVADOS_API_HOST_INSECURE']
  suppress_warnings { OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE }
end

class Google::APIClient
 def discovery_document(api, version)
  api = api.to_s
  return @discovery_documents["#{api}:#{version}"] ||= (begin
    response = self.execute!(
      :http_method => :get,
      :uri => self.discovery_uri(api, version),
      :authenticated => false
    )
    response.body.class == String ? JSON.parse(response.body) : response.body
  end)
 end
end

class ArvadosClient < Google::APIClient
  def execute(*args)
    if args.last.is_a? Hash
      args.last[:headers] ||= {}
      args.last[:headers]['Accept'] ||= 'application/json'
    end
    super(*args)
  end
end

client = ArvadosClient.new(:host => ENV['ARVADOS_API_HOST'], :application_name => 'arvados-cli', :application_version => '1.0')
arvados = client.discovered_api('arvados', ENV['ARVADOS_API_VERSION'])

def to_boolean(s)
  !!(s =~ /^(true|t|yes|y|1)$/i)
end

def help_methods(discovery_document, resource, method=nil)
  banner = "\n"
  banner += "The #{resource} resource type supports the following methods:"
  banner += "\n\n"
  discovery_document["resources"][resource.pluralize]["methods"].
    each do |k,v|
    description = ''
    description = '  ' + v["description"] if v.include?("description")
    banner += "   #{sprintf("%20s",k)}#{description}\n"
  end
  banner += "\n"
  STDERR.puts banner
  
  if not method.nil? and method != '--help' then 
    Trollop::die ("Unknown method #{method.inspect} " +
                  "for resource #{resource.inspect}")
  end
  exit 255
end

def help_resources(discovery_document, resource)
  banner = "\n"
  banner += "This Arvados instance supports the following resource types:"
  banner += "\n\n"
  discovery_document["resources"].each do |k,v|
    description = ''
    if discovery_document["schemas"].include?(k.singularize.capitalize) and 
        discovery_document["schemas"][k.singularize.capitalize].include?('description') then
      description = '  ' + discovery_document["schemas"][k.singularize.capitalize]["description"]
    end
    banner += "   #{sprintf("%30s",k.singularize)}#{description}\n"
  end
  banner += "\n"
  STDERR.puts banner

  if not resource.nil? and resource != '--help' then 
    Trollop::die "Unknown resource type #{resource.inspect}"
  end
  exit 255
end

def parse_arguments(discovery_document)
  resource_types = Array.new()
  resource_types << '--help'
  discovery_document["resources"].each do |k,v|
    resource_types << k.singularize
  end

  global_opts = Trollop::options do
    banner "arvados cli client"
    opt :dry_run, "Don't actually do anything", :short => "-n"
    opt :verbose, "Print some things on stderr", :short => "-v"
    opt :uuid, "Return the UUIDs of the objects in the response, one per line (default)", :short => nil
    opt :json, "Return the entire response received from the API server, as a JSON object", :short => "-j"
    opt :human, "Return the response received from the API server, as a JSON object with whitespace added for human consumption", :short => "-h"
    opt :pretty, "Synonym of --human", :short => nil
    opt :yaml, "Return the response received from the API server, in YAML format", :short => "-y"
    stop_on resource_types
  end
  
  resource = ARGV.shift
  if resource == '--help' or not resource_types.include?(resource)
    help_resources(discovery_document, resource)
  end

  method = ARGV.shift
  if not (discovery_document["resources"][resource.pluralize]["methods"].
          include?(method))
    help_methods(discovery_document, resource, method)
  end

  discovered_params = discovery_document\
    ["resources"][resource.pluralize]\
    ["methods"][method]["parameters"]
  method_opts = Trollop::options do
    discovered_params.each do |k,v|
      opts = Hash.new()
      opts[:type] = v["type"].to_sym if v.include?("type")
      if [:datetime, :text, :object, :array].index opts[:type]
        opts[:type] = :string                       # else trollop bork
      end
      opts[:default] = v["default"] if v.include?("default")
      opts[:default] = v["default"].to_i if opts[:type] == :integer
      opts[:default] = to_boolean(v["default"]) if opts[:type] == :boolean
      opts[:required] = true if v.include?("required") and v["required"]
      description = ''
      description = '  ' + v["description"] if v.include?("description")
      opt k.to_sym, description, opts
    end
    body_object = discovery_document["resources"][resource.pluralize]["methods"][method]["request"]
    if body_object and discovered_params[resource].nil?
      is_required = true
      if body_object["required"] == false
        is_required = false
      end
      opt resource.to_sym, "#{resource} (request body)", {
        required: is_required,
        type: :string
      }
      discovered_params[resource.to_sym] = body_object
    end
  end

  discovered_params.each do |k,v|
    k = k.to_sym
    if ['object', 'array'].index(v["type"]) and method_opts.has_key? k
      if method_opts[k].match /^\//
        method_opts[k] = File.open method_opts[k], 'rb' do |f| f.read end
      end
    end
  end
  return resource, method, method_opts, global_opts, ARGV
end

resource_schema, method, method_opts, global_opts, remaining_opts = parse_arguments(arvados.discovery_document)
controller = resource_schema.pluralize

api_method = 'arvados.' + controller + '.' + method

if global_opts[:dry_run]
  if global_opts[:verbose]
    $stderr.puts "#{api_method} #{method_opts.inspect}"
  end
  exit
end

request_parameters = {}.merge(method_opts)
resource_body = request_parameters.delete(resource_schema.to_sym)
if resource_body
  request_body = {
    resource_schema => JSON.parse(resource_body)
  }
else
  request_body = {}
end

case api_method
when
  'arvados.users.event_stream',
  'arvados.jobs.log_stream',
  'arvados.jobs.log_tail_follow'

  # Special case for methods that respond with data streams rather
  # than JSON (TODO: use the discovery document instead of a static
  # list of methods)
  uri_s = eval(api_method).generate_uri(request_parameters)
  Curl::Easy.perform(uri_s) do |curl|
    curl.headers['Accept'] = 'text/plain'
    curl.headers['Authorization'] = "OAuth2 #{ENV['ARVADOS_API_TOKEN']}"
    if ENV['ARVADOS_API_HOST_INSECURE']
      curl.ssl_verify_peer = false 
      curl.ssl_verify_host = false
    end
    if global_opts[:verbose]
      curl.on_header { |data| $stderr.write data }
    end
    curl.on_body { |data| $stdout.write data }
  end
  exit 0
else
  request_body[:api_token] = ENV['ARVADOS_API_TOKEN']
  request_body[:_profile] = true
  result = client.execute(:api_method => eval(api_method),
                          :parameters => request_parameters,
                          :body => request_body,
                          :authenticated => false)
end

begin
  results = JSON.parse result.body
rescue JSON::ParserError => e
  abort "Failed to parse server response:\n" + e.to_s
end

if results["errors"] then
  abort "Error: #{results["errors"][0]}"
end

if global_opts[:human] or global_opts[:pretty] then
  puts Oj.dump(results, :indent => 1)
elsif global_opts[:yaml] then
  puts results.to_yaml
elsif global_opts[:json] then
  puts Oj.dump(results)
elsif results["items"] and results["kind"].match /list$/i
  results['items'].each do |i| puts i['uuid'] end
elsif results['uuid'].nil?
  abort("Response did not include a uuid:\n" +
        Oj.dump(results, :indent => 1) +
        "\n")
else
  puts results['uuid']
end