module NginxTail
  module Options

    def parse_options(argv, defaults = {})

      options = OpenStruct.new(defaults)

      OptionParser.new do |opts|

        opts.banner = "Usage: ntail {options} {file(s)}"
        opts.separator ""
        opts.separator "Options are ..."

        opts.on '--verbose', '-v', "Run verbosely (log messages to STDERR)." do |value|
          options.verbose = true
        end

        opts.on '--filter',  '-f CODE', "Ruby code block for filtering (parsed) lines - needs to return true or false." do |value|
          options.filter = value
        end

        opts.on '--execute',  '-e CODE', "Ruby code block for processing each (parsed) line." do |value|
          options.code = value
        end

        opts.on '--line-number', '-l LINE_NUMBER', "Only process the line with the given line number" do |value|
          options.line_number = value.to_i
        end

        opts.on '--dry-run', '-n', "Dry-run: process files, but don't actually parse the lines" do |value|
          options.dry_run = true
        end

        opts.on '--parse-only', '-p', "Parse only: parse all lines, but don't actually process them" do |value|
          options.parse_only = true
        end

        opts.on '--raw', '-r', "Parse lines, and - for parseable ones - print out the raw input" do |value|
          options.raw = true
        end

        opts.on '--browser', '--html', "generate HTML output (the default is ANSI output)" do |value|
          options.output = :html
        end

        opts.on '--apache', "Try to match lines using the Apache log format instead of nginx (the default)" do |value|
          options.pattern = :apache
        end

        opts.on '--sleep [SECONDS]', '-s', Float, "Sleeps for the given number of seconds before processing the next line (--raw only)" do |value|
          options.sleep = value
        end

        opts.on '--progress', '-p', String, "In-flight progress animation during parsing" do |value|
          unless $stdout.tty?
            Sickill::Rainbow.enabled = true
            options.progress = true
          end
        end

        opts.on '--static-repo [REPO]', String, "Add [REPO] to the list of static repos" do |value|
          NginxTail::LogLine.add_static_repo(value)
        end

        opts.on '--persist', '-P', String, "Persist the parsed lines for future use" do |value|
          options.persist = true
        end

        opts.on '--version', '-V', "Display the program version." do |value|
          puts "#{NTAIL_NAME}, version #{NTAIL_VERSION}"
          options.running = false
        end

        opts.on_tail("-h", "--help", "-H", "Display this help message.") do
          puts opts
          options.running = false
        end

      end.parse!(argv)

      return options

    end

  end # module Options
end # module NginxTail