#!/usr/bin/env ruby

# Orvos 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

ENV['ORVOS_API_VERSION'] ||= 'v1'

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

begin
  require 'rubygems'
  require 'google/api_client'
  require 'json'
  require 'pp'
  require 'trollop'
rescue LoadError
  abort <<-EOS

Please install all required gems: 

  google-api-client
  json
  trollop

  EOS
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:
suppress_warnings { OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE }

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

client = Google::APIClient.new(:host => ENV['ORVOS_API_HOST'], :application_name => 'wh-cli', :application_version => '1.0')
orvos = client.discovered_api('orvos', ENV['ORVOS_API_VERSION'])

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

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

  global_opts = Trollop::options do
    banner "orvos cli client"
    opt :dry_run, "Don't actually do anything", :short => "-n"
    stop_on sub_commands
  end
  
  # get the subcommand
  cmd = ARGV.shift
  cmd = cmd.pluralize unless cmd.nil?
  if sub_commands.include?(cmd) and cmd != '--help' then
    # subcommand exists
    # Now see if the method supplied exists
    method = ARGV.shift 
    if discovery_document["resources"][cmd]["methods"].include?(method) then
      # method exists. Collect arguments.
      discovered_params = discovery_document["resources"][cmd]["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].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
        opt :json, "Return the raw json received from the API server", :short => "-j"
        opt :jsonhuman, "Return the raw json received from the API server, formatted for human consumption", :short => "-h"
      end
      discovered_params.each do |k,v|
        if v["type"] == "object" and method_opts.has_key? k
          method_opts[k] = JSON.parse method_opts[k]
        end
      end
    else
      banner = "\nThis api command supports the following methods:\n\n"
      discovery_document["resources"][cmd]["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.to_s} for command #{cmd.to_s}"
      else
        exit 255
      end

    end
    
  else
    banner = "\nThis Orvos cluster supports the following api commands:\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 cmd.nil? and cmd != '--help' then 
      Trollop::die "Unknown command #{cmd.inspect}"
    else
      exit 255
    end
  end

  return cmd, method, method_opts, ARGV
end

cmd, method, method_opts, remaining_opts = parse_arguments(orvos.discovery_document)

api_method = 'orvos.' + cmd + '.' + method

m_o = method_opts.reject {|key,value| key =~ /_given$|^json$|^jsonhuman$|^help$/ or value == nil }

result = client.execute :api_method => eval(api_method), :parameters => { :api_token => ENV['ORVOS_API_TOKEN'] }.merge(m_o), :authenticated => false
results = JSON.parse result.body

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

if method_opts[:json] then
  puts results.to_s
elsif method_opts[:jsonhuman] then
  puts results.pretty_inspect()
elsif results["items"] and results["kind"].match /list$/i
  results['items'].each do |i| puts i['uuid'] end
else
  puts results['uuid']
end