require 'fileutils'
require 'new_relic/version'
require 'erb'

class NewRelic::Command::Install < NewRelic::Command

  NO_LICENSE_KEY = "<PASTE LICENSE KEY HERE>"

  def self.command; "install"; end

  # Use -h to see options.
  # When command_line_args is a hash, we are invoking directly and
  # it's treated as an options with optional string values for
  # :user, :description, :appname, :revision, :environment,
  # and :changes.
  #
  # Will throw CommandFailed exception if there's any error.
  #
  attr_reader :dest_dir, :license_key, :generated_for_user, :quiet, :src_file, :app_name
  def initialize command_line_args={}
    super command_line_args
    if !@dest_dir
      # Install a newrelic.yml file into the local config directory.
      if File.directory? "config"
        @dest_dir = "config"
      else
        @dest_dir = "."
      end
    end
    @license_key ||= NO_LICENSE_KEY
    @app_name ||= @leftover
    raise CommandFailure.new("Application name required.", @options) unless @app_name && @app_name.size > 0
    @generated_for_user ||= @user_string || ""
  end

  def run
    dest_file = File.expand_path(@dest_dir + "/newrelic.yml")
    if File.exist?(dest_file)
      raise NewRelic::Command::CommandFailure, "newrelic.yml file already exists.  Move it out of the way."
    end
    File.open(dest_file, 'w') { | out | out.puts(content) }

    puts <<-EOF unless quiet

Installed a default configuration file at
#{dest_file}.
    EOF
    puts <<-EOF unless quiet || @license_key != NO_LICENSE_KEY

To monitor your application in production mode, sign up for an account
at www.newrelic.com, and replace the newrelic.yml file with the one
you receive upon registration.
    EOF
    puts <<-EOF unless quiet
    
E-mail support@newrelic.com with any problems or questions.
    EOF
    
  end

  def content
    @src_file ||= File.expand_path(File.join(File.dirname(__FILE__),"..","..","..","newrelic.yml"))
    template = File.read(@src_file)
    ERB.new(template).result(binding)
  end

  private

  def options
    OptionParser.new "Usage: #{$0} #{self.class.command} [ OPTIONS] 'application name'", 40 do |o|
      o.on("-l", "--license_key=NAME", String,
             "Use the given license key") { | e | @license_key = e }
      o.on("-d", "--destdir=name", String,
               "Write the newrelic.yml to the given directory, default is '.'") { | e | @dest_dir = e }
      yield o if block_given?
    end
  end


end