module SvelteOnRails::Installer::Utils

def self.create_svelte_hello_world
  file_path = Rails.root.join("app", "frontend", "javascript", "components", "HelloWorld.svelte")
  if File.exist?(file_path)
    puts "Hello World file already exists: file://#{file_path}"
  else
    File.write(file_path, <<~HTML)
      <script>
          export let items
          let count = 0;
          function increment() {
              count += 1;
          }
      </script>
      <h1>Greetings from svelte</h1>
      <button on:click={increment}>Increment: {count}</button>
      <ul>
          {#each items as item}
              <li>{item}</li>
          {/each}
      </ul>
      <style>
          button {
              background-color: darkred;
              color: white;
              padding: 10px;
              border: none;
          }
      </style>
    HTML
    puts "Hello World file at file://#{file_path}"
  end
end