class YARD::CLI::Config

def configure_gemrc
  return unless gem_install_cmd
  require 'rubygems'
  ['install', :install, 'gem', :gem].find do |cmd|
    conf = Gem.configuration[cmd] || ""
    next if conf.empty? && cmd != :gem
    conf = conf.split(/\s+/)
    conf.delete_if {|c| c =~ /^--(no-)?document\b/ } # scrub doc args
    conf |= ["--document=#{gem_install_cmd}"]
    conf = conf.join(' ')
    Gem.configuration[cmd] = conf
    Gem.configuration.write
    log.puts "Updated #{Gem.configuration.path || '~/.gemrc'}: '#{cmd}: #{conf}'"
    true
  end
end

def description
  'Views or edits current global configuration'
end

def encode_value(value)
  case value
  when /^-?\d+/; value.to_i
  when "true"; true
  when "false"; false
  else value
  end
end

def encode_values
  if values.size == 1 && !as_list
    encode_value(values.first)
  else
    values.map {|v| encode_value(v) }
  end
end

def initialize
  super
  self.key = nil
  self.values = []
  self.reset = false
  self.append = false
  self.as_list = false
  self.gem_install_cmd = nil
end

def list_configuration
  log.debug "Listing configuration"
  require 'yaml'
  log.puts YAML.dump(YARD::Config.options).sub(/\A--.*\n/, '').gsub(/\n\n/, "\n")
end

def modify_item
  if reset
    log.debug "Resetting #{key}"
    YARD::Config.options[key] = YARD::Config::DEFAULT_CONFIG_OPTIONS[key]
  else
    log.debug "Setting #{key} to #{values.inspect}"
    items = encode_values
    current_items = YARD::Config.options[key]
    items = [current_items].flatten + [items].flatten if append
    YARD::Config.options[key] = items
  end
  YARD::Config.save
end

def optparse(*args)
  list = false
  self.as_list = false
  self.append = false
  opts = OptionParser.new
  opts.banner = "Usage: yard config [options] [item [value ...]]"
  opts.separator ""
  opts.separator "Example: yard config load_plugins true"
  opts.separator ""
  opts.separator "Views and sets configuration items. If an item is provided"
  opts.separator "With no value, the item is viewed. If a value is provided,"
  opts.separator "the item is modified. Specifying no item is equivalent to --list."
  opts.separator "If you specify multiple space delimited values, these are"
  opts.separator "parsed as an array of values."
  opts.separator ""
  opts.separator "Note that `true` and `false` are reserved words."
  opts.separator ""
  opts.separator "---------------------------------------------------------"
  opts.separator ""
  opts.separator "Configuring RubyGems support:"
  opts.separator ""
  opts.separator "YARD can automatically generate the YRI index or HTML"
  opts.separator "documentation in a `gem install` by adding the following"
  opts.separator "to your ~/.gemrc file:"
  opts.separator ""
  opts.separator "    gem: \"--document=yri\""
  opts.separator ""
  opts.separator "Note: you can add 'yard' to also generate HTML docs."
  opts.separator "  You can also add 'ri' to continue generating RDoc."
  opts.separator ""
  opts.separator "You can also run the following command to configure this"
  opts.separator "behavior automatically:"
  opts.separator ""
  opts.separator "    $ yard config --gem-install-yri"
  opts.separator ""
  opts.separator "Add --gem-install-yard to also generate HTML."
  opts.separator ""
  opts.separator "---------------------------------------------------------"
  opts.separator ""
  opts.separator "General options:"
  opts.on('-l', '--list', 'List current configuration') do
    list = true
  end
  opts.on('-r', '--reset', 'Resets the specific item to default') do
    self.reset = true
  end
  opts.separator ""
  opts.separator "Modifying keys:"
  opts.on('-a', '--append', 'Appends items to existing key values') do
    self.append = true
  end
  opts.on('--as-list', 'Forces the value(s) to be wrapped in an array') do
    self.as_list = true
  end
  opts.separator ""
  opts.separator "Add RubyGems install hook:"
  opts.on('--gem-install-yri', 'Configures ~/.gemrc to run yri on a gem install') do
    self.gem_install_cmd = 'yri' if gem_install_cmd != 'yard'
  end
  opts.on('--gem-install-yard', 'Configures ~/.gemrc to run yard on a gem install') do
    self.gem_install_cmd = 'yard'
  end
  common_options(opts)
  parse_options(opts, args)
  args = [] if list
  self.key = args.shift.to_sym if args.size >= 1
  self.values = args if args.size >= 1
  args
end

def run(*args)
  optparse(*args)
  if gem_install_cmd
    configure_gemrc
  elsif key
    if reset || !values.empty?
      modify_item
    else
      view_item
    end
  else
    list_configuration
  end
end

def view_item
  log.debug "Viewing #{key}"
  log.puts YARD::Config.options[key].inspect
end