# frozen_string_literal: true

module Reviewer
  class Arguments
    class Keywords
      module Git
        # Provides a convenient interface to get the list of staged files
        class Staged
          OPTIONS = [
            'diff',
            '--staged',
            '--name-only'
          ].freeze

          attr_reader :stdout, :stderr, :status, :exit_status

          def to_a
            stdout.present? ? stdout.split("\n") : []
          end

          def to_s
            stdout.present? ? stdout : ''
          end

          def inspect
            {
              command: command,
              stdout: stdout,
              stderr: stderr,
              status: status,
              results: results
            }
          end

          def list
            @stdout, @stderr, @status = Open3.capture3(command)
            @exit_status = @status.exitstatus.to_i

            @status.success? ? to_a : raise_command_line_error
          end

          def self.list
            new.list
          end

          def command
            command_parts.join(' ')
          end

          private

          def raise_command_line_error
            message = "Git Error: #{stderr} (#{command})"
            raise SystemCallError.new(message, exit_status)
          end

          def command_parts
            BASE_COMMAND + OPTIONS
          end
        end
      end
    end
  end
end