module Figly

# File lib/figly.rb, line 79
def self._config_loaded?
  defined?(@@data) && @@data
end

# File lib/figly.rb, line 68
def self._deep_merge(first, second)
  merger = proc { |key, v1, v2| Hash === v1 && Hash === v2 ? v1.merge(v2, &merger) : v2 }
  first.merge!(second, &merger)
end

# File lib/figly.rb, line 73
def self._ensure_loaded!
  unless _config_loaded?
    raise ConfigNotLoaded, "You must first load the config before attempting to access it"
  end
end

# File lib/figly.rb, line 59
def self.clean
  @@data = nil
end

# File lib/figly.rb, line 63
def self.data
  _ensure_loaded!
  @@data
end

# File lib/figly.rb, line 10
def self.load_file(path)
  raise ConfigNotFoundError, "File does not exist: #{path}" unless File.exists?(path)
  ext = File.extname(path)
  data = case ext
  when '.toml'
    begin
      require 'toml'
      # HACK: TOML captures Parslet errors and puts them so they get swallowed
      # here we redirect stdout to an IO buffer that we can read from and test
      # that the value doesn't match an error
      old_stdout = $stdout
      $stdout = StringIO.new('','w')
      TOML.load_file(path).tap do |d|
        cap = $stdout.string
        raise ParserError, cap if cap =~ /^Failed to match/
      end
    rescue Exception => e
      raise ParserError, e.message
    ensure
      # Make sure to reset the old stdout even if an exception is thrown
      $stdout = old_stdout
    end
  when '.yml'
    begin
      require 'yaml'
      YAML.load_file(path)
    rescue Exception => e
      raise ParserError, e.message
    end
  when '.json'
    begin
      require 'json'
      JSON.parse(File.read(path))
    rescue Exception => e
      raise ParserError, e.message
    end
  else
    raise UnsupportedFormatError, "Unsupported file extension (#{ext})"
  end

  # Here we merge config files if there are multiple load calls
  if _config_loaded?
    _deep_merge(@@data, data)
  else
    @@data = data.extend(Settings::SettingsHash)
  end
end