module RubyPitaya

  class Config

    def initialize()
      @config = {}
      @configs_folder_paths = [Path::APP_CONFIG_FOLDER_PATH] + Path::Plugins::APP_CONFIG_FOLDER_PATHS

      @configs_folder_paths.each do |configs_folder_path|
        path_to_all_files = File.join(configs_folder_path, '**/*.json')
        config_files = Dir.glob(path_to_all_files)

        config_files.each do |config_file|
          load_config_file(configs_folder_path, config_file)
        end
      end
    end

    def get
      @config
    end

    def [](key)
      @config[key]
    end

    def auto_reload
      require 'listen'

      @configs_folder_paths.each do |configs_folder_path|
        config_files_listener = Listen.to(configs_folder_path, only: /\.json$/) do |modified, added, removed|
          import_added_files(configs_folder_path, added)
          reload_modified_files(configs_folder_path, modified)
        end

        config_files_listener.start
      end
    end

    private

    def load_config_file(configs_folder_path, file_path)
      config_text = File.open(file_path, &:read)
      config_hash = JSON.parse(config_text)

      path_array = file_path.sub(/^#{configs_folder_path}/, '')[0..-6]
                              .split('/')

      set_config_value(path_array, config_hash)

      rescue Exception => error
        puts "ERROR: #{error}"
        puts error.backtrace
    end

    def import_added_files(configs_folder_path, files_path)
      files_path.each do |path|
        load_config_file(configs_folder_path, path)

        puts "ADDED config: #{path}"
      end
    end

    def reload_modified_files(configs_folder_path, files_path)
      files_path.each do |path|
        load_config_file(configs_folder_path, path)

        puts "MODIFIED @config: #{path}"
      end
    end

    def set_config_value(keys, value)
      config = @config

      keys.each_with_index do |key, index|
        is_last_index = index == keys.size - 1

        if is_last_index
          config[key] = value
        else
          config[key] = {} unless config.key?(key)
          config = config[key]
        end
      end
    end
  end
end