# frozen_string_literal: true

require "byebug/helpers/file"

module Byebug
  #
  # Reopens the +info+ command to define the +file+ subcommand
  #
  class InfoCommand < Command
    #
    # Information about a particular source file
    #
    class FileCommand < Command
      include Helpers::FileHelper
      include Helpers::StringHelper

      self.allow_in_post_mortem = true

      def self.regexp
        /^\s* f(?:ile)? (?:\s+ (.+))? \s*$/x
      end

      def self.description
        <<-DESCRIPTION
          inf[o] f[ile]

          #{short_description}

          It informs about file name, number of lines, possible breakpoints in
          the file, last modification time and sha1 digest.
        DESCRIPTION
      end

      def self.short_description
        "Information about a particular source file."
      end

      def execute
        file = @match[1] || frame.file
        return errmsg(pr("info.errors.undefined_file", file: file)) unless File.exist?(file)

        puts prettify <<-RUBY
          File #{info_file_basic(file)}

          Breakpoint line numbers: #{info_file_breakpoints(file)}

          Modification time: #{info_file_mtime(file)}

          Sha1 Signature: #{info_file_sha1(file)}
        RUBY
      end

      private

      def info_file_basic(file)
        path = File.expand_path(file)
        return unless File.exist?(path)

        s = n_lines(path) == 1 ? "" : "s"
        "#{path} (#{n_lines(path)} line#{s})"
      end

      def info_file_breakpoints(file)
        breakpoints = Breakpoint.potential_lines(file)
        return unless breakpoints

        breakpoints.to_a.sort.join(" ")
      end

      def info_file_mtime(file)
        File.stat(file).mtime
      end

      def info_file_sha1(file)
        require "digest/sha1"
        Digest::SHA1.hexdigest(file)
      end
    end
  end
end
