class Coupdoeil::InstallGenerator < Rails::Generators::Base
  Coupdoeil::InstallGenerator.source_root Coupdoeil::Engine.root.join("lib/generators/coupdoeil/install/templates")

  desc "Create base class for hovercards and default layout."

  def create_base_class
    create_file "app/hovercards/application_hovercard.rb", <<~RUBY
      class ApplicationHovercard < Coupdoeil::Hovercard
      end
    RUBY
  end

  def insert_default_layout
    template "layout.html.erb.tt", "app/hovercards/layouts/hovercard.html.erb"
  end

  def install_javascripts
    puts ""
    if Rails.root.join("config/importmap.rb").exist?
      append_to_importmap
    elsif Rails.root.join("package.json").exist?
      add_with_node
    else
      puts "You must either be running with node (package.json) or importmap-rails (config/importmap.rb) to use this gem."
    end
  end

  def install_stylesheets
    puts ""
    import_stylesheet
    hidden_class_requirement
  end

  private

  def append_to_importmap
    puts "Using importmap"
    puts "Pin Coupdoeil"
    append_to_file "config/importmap.rb", %(pin "coupdoeil", to: "coupdoeil.min.js", preload: true\n)

    puts "Import Coupdoeil"
    append_to_file "app/javascript/application.js", %(import "coupdoeil"\n)
  end

  def add_with_node
    if Rails.root.join("app/javascript/application.js").exist?
      say "Import Coupdoeil"
      append_to_file "app/javascript/application.js", %(import "coupdoeil"\n)
    else
      say "You must import coupdoeil in your JavaScript entrypoint file", :red
    end

    say "Install Coupdoeil"
    run "yarn add coupdoeil"
  end

  def import_stylesheet
    puts "To use Coupdoeil hovercard style, add to your layout's head:"
    puts ""
    puts <<-ERB
      <%= stylesheet_link_tag "coupdoeil/hovercard" %>
    ERB
    puts ""
    puts "Or one of two:"
    puts ""
    puts <<-ERB
      <%= stylesheet_link_tag "coupdoeil/hovercard-arrow" %>
      <%= stylesheet_link_tag "coupdoeil/hovercard-animation" %>
    ERB
  end

  def hidden_class_requirement
    puts ""
    puts "Also make sure you have a CSS implementation of .hidden class:"
    puts ""
    puts <<-CSS
        .hidden {
            display: none;
        }
    CSS
    puts ""
  end
end