class Rubocop::Formatter::JSONFormatter

def file_finished(file, offences)
  output_hash[:files] << hash_for_file(file, offences)
  output_hash[:summary][:offence_count] += offences.count
end

def finished(inspected_files)
  output_hash[:summary][:inspected_file_count] = inspected_files.count
  output.write output_hash.to_json
end

def hash_for_file(file, offences)
  {
    path:     relative_path(file),
    offences: offences.map { |o| hash_for_offence(o) }
  }
end

def hash_for_location(offence)
  {
    line:   offence.line,
    column: offence.real_column
  }
end

def hash_for_offence(offence)
  {
    severity: offence.severity,
    message:  offence.message,
    cop_name: offence.cop_name,
    corrected: offence.corrected?,
    location: hash_for_location(offence)
  }
end

def initialize(output)
  super
  @output_hash = {
    metadata: metadata_hash,
    files:    [],
    summary:  { offence_count: 0 }
  }
end

def metadata_hash
  {
    rubocop_version: Rubocop::Version::STRING,
    ruby_engine:     RUBY_ENGINE,
    ruby_version:    RUBY_VERSION,
    ruby_patchlevel: RUBY_PATCHLEVEL.to_s,
    ruby_platform:   RUBY_PLATFORM
  }
end

def relative_path(path)
  Pathname.new(path).relative_path_from(Pathname.getwd).to_s
end

def started(target_files)
  output_hash[:summary][:target_file_count] = target_files.count
end