# frozen_string_literal: true

class StimulusReflex::SanityChecker
  LATEST_VERSION_FORMAT = /^(\d+\.\d+\.\d+)$/
  NODE_VERSION_FORMAT = /(\d+\.\d+\.\d+.*):/
  JSON_VERSION_FORMAT = /(\d+\.\d+\.\d+.*)"/

  class << self
    def check!
      return if ENV["SKIP_SANITY_CHECK"]
      return if StimulusReflex.config.on_failed_sanity_checks == :ignore
      return if called_by_installer?
      return if called_by_generate_config?
      return if called_by_rake?

      instance = new
      instance.check_caching_enabled
      instance.check_package_versions_match
      # instance.check_default_url_config
      instance.check_new_version_available
    end

    private

    def called_by_installer?
      Rake.application.top_level_tasks.include? "stimulus_reflex:install"
    rescue
      false
    end

    def called_by_generate_config?
      ARGV.include? "stimulus_reflex:initializer"
    end

    def called_by_rake?
      File.basename($PROGRAM_NAME) == "rake"
    end
  end

  def check_caching_enabled
    if caching_not_enabled?
      warn_and_exit <<~WARN
        👉 StimulusReflex requires caching to be enabled. Caching allows the session to be modified during ActionCable requests.

        To enable caching in development, run:

          rails dev:cache
      WARN
    end

    if using_null_store?
      warn_and_exit <<~WARN
        👉 StimulusReflex requires caching to be enabled.
        
        Caching allows the session to be modified during ActionCable requests. Your config.cache_store is set to :null_store, so it won't work.
      WARN
    end
  end

  def check_default_url_config
    return if StimulusReflex.config.on_missing_default_urls == :ignore
    if default_url_config_set? == false
      puts <<~WARN
        👉 StimulusReflex strongly suggests that you set default_url_options in your environment files. Otherwise, ActionController #{"and ActionMailer " if defined?(ActionMailer)}will default to example.com when rendering route helpers.

        You can set your URL options in config/environments/#{Rails.env}.rb

          config.action_controller.default_url_options = {host: "localhost", port: 3000}
          #{"config.action_mailer.default_url_options = {host: \"localhost\", port: 3000}\n" if defined?(ActionMailer)}
        Please update every environment with the appropriate URL. Typically, no port is necessary in production.

      WARN
    end
  end

  def check_package_versions_match
    if npm_version.nil?
      warn_and_exit <<~WARN
        👉 Can't locate the stimulus_reflex npm package.

          yarn add stimulus_reflex@#{gem_version}

        Either add it to your package.json as a dependency or use "yarn link stimulus_reflex" if you are doing development.
      WARN
    end

    if package_version_mismatch?
      warn_and_exit <<~WARN
        👉 The stimulus_reflex npm package version (#{npm_version}) does not match the Rubygem version (#{gem_version}).

        To update the stimulus_reflex npm package:

          yarn upgrade stimulus_reflex@#{gem_version}
      WARN
    end
  end

  def check_new_version_available
    return if StimulusReflex.config.on_new_version_available == :ignore
    return if Rails.env.development? == false
    return if using_preview_release?
    begin
      latest_version = URI.open("https://raw.githubusercontent.com/stimulusreflex/stimulus_reflex/master/LATEST", open_timeout: 1, read_timeout: 1).read.strip
      if latest_version != StimulusReflex::VERSION
        puts <<~WARN

          👉 There is a new version of StimulusReflex available!
          Current: #{StimulusReflex::VERSION} Latest: #{latest_version}

          If you upgrade, it is very important that you update BOTH Gemfile and package.json
          Then, run `bundle install && yarn install` to update to #{latest_version}.

        WARN
        exit if StimulusReflex.config.on_new_version_available == :exit
      end
    rescue
      puts "👉 StimulusReflex #{StimulusReflex::VERSION} update check skipped: connection timeout"
    end
  end

  def caching_not_enabled?
    Rails.application.config.action_controller.perform_caching == false
  end

  def using_null_store?
    Rails.application.config.cache_store == :null_store
  end

  def default_url_config_set?
    if defined?(ActionMailer)
      Rails.application.config.action_controller.default_url_options.blank? && Rails.application.config.action_mailer.default_url_options.blank?
    else
      Rails.application.config.action_controller.default_url_options.blank?
    end
  end

  def package_version_mismatch?
    npm_version != gem_version
  end

  def using_preview_release?
    preview = StimulusReflex::VERSION.match?(LATEST_VERSION_FORMAT) == false
    puts "👉 StimulusReflex #{StimulusReflex::VERSION} update check skipped: pre-release build" if preview
    preview
  end

  def gem_version
    @_gem_version ||= StimulusReflex::VERSION.gsub(".pre", "-pre")
  end

  def npm_version
    @_npm_version ||= find_npm_version
  end

  def find_npm_version
    if (match = search_file(package_json_path, regex: /version/))
      match[JSON_VERSION_FORMAT, 1]
    elsif (match = search_file(yarn_lock_path, regex: /^stimulus_reflex/))
      match[NODE_VERSION_FORMAT, 1]
    end
  end

  def search_file(path, regex:)
    return if File.exist?(path) == false
    File.foreach(path).grep(regex).first
  end

  def package_json_path
    Rails.root.join("node_modules", "stimulus_reflex", "package.json")
  end

  def yarn_lock_path
    Rails.root.join("yarn.lock")
  end

  def initializer_missing?
    File.exist?(Rails.root.join("config", "initializers", "stimulus_reflex.rb")) == false
  end

  def warn_and_exit(text)
    puts
    puts "Heads up! 🔥"
    puts
    puts text
    puts
    if StimulusReflex.config.on_failed_sanity_checks == :exit
      puts <<~INFO
        To ignore any warnings and start the application anyway, you can set the SKIP_SANITY_CHECK environment variable:

          SKIP_SANITY_CHECK=true rails

        To do this permanently, add the following directive to the StimulusReflex initializer:

          StimulusReflex.configure do |config|
            config.on_failed_sanity_checks = :warn
          end

      INFO
      if initializer_missing?
        puts <<~INFO
          You can create a StimulusReflex initializer with the command:

            bundle exec rails generate stimulus_reflex:initializer

        INFO
      end
      exit false if Rails.env.test? == false
    end
  end
end