# frozen_string_literal: true

require_relative "../multi_logger"
require_relative "../string_support"

module Fusuma
  module Plugin
    # Manage Fusuma plugins
    class Manager
      def initialize(plugin_class)
        @plugin_class = plugin_class
      end

      def require_siblings_from_plugin_dir
        fusuma_default_plugin_paths.each { |siblings_plugin| require(siblings_plugin) }
      end

      def require_siblings_from_gems
        fusuma_external_plugin_paths.each { |siblings_plugin| require(siblings_plugin) }
      end

      def exclude_path_pattern
        %r{fusuma/plugin/[^/]*.rb}
      end

      def fusuma_default_plugin_paths
        @_fusuma_default_plugin_paths ||= Dir.glob(File.expand_path("#{__dir__}/../../#{search_key}")).grep_v(exclude_path_pattern).sort
      end

      # @return [Array<String>] paths of external plugins (installed by gem)
      def fusuma_external_plugin_paths
        @_fusuma_external_plugin_paths ||=
          Gem.find_latest_files(search_key).map do |siblings_plugin|
            next unless %r{fusuma-plugin-(.+).*/lib/#{plugin_dir_name}/.+\.rb}.match?(siblings_plugin)

            match_data = siblings_plugin.match(%r{(.*)/(.*)/lib/(.*)})
            plugin_gemspec_path = Dir.glob("#{match_data[1]}/#{match_data[2]}/*.gemspec").first
            raise "Not Found: #{match_data[1]}/#{match_data[2]}/*.gemspec" unless plugin_gemspec_path

            plugin_gemspec = Gem::Specification.load(plugin_gemspec_path)
            fusuma_gemspec_path = File.expand_path("../../../fusuma.gemspec", __dir__)
            fusuma_gemspec = Gem::Specification.load(fusuma_gemspec_path)
            next if plugin_gemspec == fusuma_gemspec

            if plugin_gemspec.dependencies.find { |d| d.name == "fusuma" }&.match?(fusuma_gemspec)
              siblings_plugin
            else
              MultiLogger.warn "#{plugin_gemspec.name} #{plugin_gemspec.version} is incompatible with running #{fusuma_gemspec.name} #{fusuma_gemspec.version}"
              MultiLogger.warn "gemspec: #{plugin_gemspec_path}"
              next
            end
          end.compact.grep_v(exclude_path_pattern).sort
      end

      # @return [String] search key for plugin
      # @example
      # search_key
      # => "fusuma/plugin/detectors/*rb"
      def search_key
        File.join(plugin_dir_name, "*rb")
      end

      private

      # @example
      #  plugin_dir_name
      #   => "fusuma/plugin/detectors"
      # @return [String]
      def plugin_dir_name
        @plugin_class.name.match(/(Fusuma::.*)::/)[1].to_s.underscore
      end

      class << self
        # @example
        #  Manager.plugins
        #  => {"Base"=>[Detectors::Detector],
        #      "Detectors::Detector"=>[Detectors::RotateDetector,
        #                              Detectors::PinchDetector,
        #                              Detectors::SwipeDetector]}

        # @param plugin_class [Class]
        # return [Hash, false]
        def add(plugin_class:, plugin_path:)
          return false if exist?(plugin_class: plugin_class, plugin_path: plugin_path)

          base = plugin_class.superclass.name
          plugins[base] ||= []
          plugins[base] << plugin_class

          load_paths << plugin_path

          manager = Manager.new(plugin_class)

          @already_required ||= {}

          key = manager.search_key
          return if @already_required[key]

          @already_required[key] = true
          manager.require_siblings_from_plugin_dir
          manager.require_siblings_from_gems
        end

        def require_base_plugins
          require_relative "base"
          require_relative "events/event"
          require_relative "inputs/input"
          require_relative "filters/filter"
          require_relative "parsers/parser"
          require_relative "buffers/buffer"
          require_relative "detectors/detector"
          require_relative "executors/executor"
        end

        def plugins
          @plugins ||= {}
        end

        # @return [Array<String>]
        # @example
        #   Manager.load_paths
        #   => ["/path/to/fusuma/lib/fusuma/plugin/inputs/input.rb",
        #       "/path/to/fusuma/lib/fusuma/plugin/inputs/libinput_command_input.rb",
        #       "/path/to/fusuma/lib/fusuma/plugin/inputs/timer_input.rb"]
        def load_paths
          @load_paths ||= []
        end

        # @param plugin_class [Class]
        # @return [Boolean]
        def exist?(plugin_class:, plugin_path:)
          return false if load_paths.include?(plugin_path)

          base = plugin_class.superclass.name
          return false unless plugins[base]

          plugins[base].include?(plugin_class)
        end
      end
    end
  end
end
