# frozen_string_literal: true

module Migrations::CLI::ConvertCommand
  def self.included(thor)
    thor.class_eval do
      desc "convert [FROM]", "Convert a file"
      option :settings, type: :string, desc: "Path of settings file", banner: "path"
      option :reset, type: :boolean, desc: "Reset database before converting data"
      def convert(converter_type)
        converter_type = converter_type.downcase
        validate_converter_type!(converter_type)

        settings = load_settings(converter_type)

        ::Migrations::Database.reset!(settings[:intermediate_db][:path]) if options[:reset]

        converter = "migrations/converters/#{converter_type}/converter".camelize.constantize
        converter.new(settings).run
      end

      private

      def validate_converter_type!(type)
        converter_names = ::Migrations::Converters.names

        raise Thor::Error, <<~MSG if !converter_names.include?(type)
            Unknown converter name: #{type}
            Valid names are: #{converter_names.join(", ")}
          MSG
      end

      def validate_settings_path!(settings_path)
        if !File.exist?(settings_path)
          raise Thor::Error, "Settings file not found: #{settings_path}"
        end
      end

      def load_settings(converter_type)
        settings_path = calculate_settings_path(converter_type)
        validate_settings_path!(settings_path)

        YAML.safe_load(File.read(settings_path), symbolize_names: true)
      end

      def calculate_settings_path(converter_type)
        settings_path =
          options[:settings] || ::Migrations::Converters.default_settings_path(converter_type)
        File.expand_path(settings_path, Dir.pwd)
      end
    end
  end
end