# frozen_string_literal: true

require 'evdev'

module Fusuma
  module Plugin
    module Sendkey
      # handle Evdev device
      class Device
        attr_reader :device_id
        def initialize(path: nil)
          return if path && (@evdev = Evdev.new(path))

          (0..99).lazy.find do |i|
            begin
              evdev = Evdev.new("/dev/input/event#{i}")
              @evdev = evdev if evdev.supports_event?(convert_keycode('LEFTALT'))
            rescue Errno::ENOENT # No such file or directory
              false
              # TODO: rescue Errno::EACCES
            end
          end
        end

        def path
          raise 'Keyboard is not found' if @evdev.nil?

          @path ||= @evdev.file.path
        end

        def support?(code)
          keycode = convert_keycode(code)
          @evdev.supports_event?(keycode)
        rescue NameError
          candidates = search_codes(code: code)

          warn "Did you mean? #{candidates.join(' / ')}" unless candidates.empty?

          false
        end

        def search_codes(code: nil)
          query = code&.upcase
          LinuxInput.constants
                    .select { |c| c[/KEY_.*#{query}.*/] }
                    .select { |c| @evdev.supports_event?(c) }
                    .map { |c| c.to_s.gsub('KEY_', '') }
        end

        def emulate(code:, press: true)
          keycode = convert_keycode(code)
          v = press ? 1 : 0
          "evemu-event #{path} --type EV_KEY --code #{keycode} --value #{v} --sync"
        end

        private

        def convert_keycode(code)
          "KEY_#{code.upcase}"
        end
      end
    end
  end
end