class InstrumentalComponents::Installer

def download_gem
  puts "Debug: Starting download_gem method..."
  # For local development, set INSTRUMENTAL_DOMAIN=http://localhost:3000 in .env
  # This allows testing against a local server while developing the gem
  puts "Debug: INSTRUMENTAL_DOMAIN = #{ENV['INSTRUMENTAL_DOMAIN'].inspect}"
  domain = ENV['INSTRUMENTAL_DOMAIN'] || 'https://instrumental.dev'
  unless 'https://instrumental.dev' == domain
    puts "Using domain: #{domain}" # Confirm that we're in local development mode
  end
  # This API endpoint on instrumental.dev will return the latest version of the gem and
  # save it in the root of the project under the filename, instrumental-components-library-latest.gem
  gem_url = "#{domain}/gem_downloads/instrumental-components-library-latest.gem?token=#{@license_key}&email=#{@email}"
  begin
    response = URI.open(gem_url)
    # Check if the response is JSON (indicating an error)
    content_type = response.content_type
    if content_type&.include?('application/json')
      error_data = JSON.parse(response.read)
      raise error_data['error'] || 'Authentication failed'
    end
    # If not JSON, it's the gem file - proceed with saving
    File.open('instrumental-components-library-latest.gem', 'wb') do |file|
      file.write(response.read)
    end
  rescue OpenURI::HTTPError => e
    if e.io.status[0] == '401' || e.io.status[0] == '403' || e.io.status[0] == '404'
      # Try to parse the error message from the response
      begin
        error_data = JSON.parse(e.io.read)
        raise error_data['error']
      rescue JSON::ParserError
        raise "Server returned #{e.io.status[0]} status code"
      end
    else
      raise "Error downloading gem: #{e.message}"
    end
  rescue JSON::ParserError
    # If JSON parsing fails, it's likely the gem file - proceed with saving
    File.open('instrumental-components-library-latest.gem', 'wb') do |file|
      file.write(response.read)
    end
  end
end

def initialize(license_key, email)
  @license_key = license_key
  @email = email
end

def install
  puts "📥 Downloading the latest version of Instrumental Components..."
  puts "Debug: Starting installation process..."
  begin
    # Load .env file if it exists (for local development only)
    if File.exist?('.env')
      puts "Debug: Loading local .env file..."
      Dotenv.load
    end
    puts "Debug: Environment variables - INSTRUMENTAL_DOMAIN = #{ENV['INSTRUMENTAL_DOMAIN'].inspect}"
    # Download the latest version of the gem
    download_gem
    puts "📦 Installing the gem on your system..."
    install_gem
    puts "📝 Updating Gemfile..."
    update_gemfile
    puts ""
    puts "Running 'bundle install'..."
    run_bundle_install
    puts ""
    puts "🚀 Running the Instrumental Components installer..."
    run_installer
    puts ""
  rescue => e
    # Display the error message sent by the logic in instrumental.dev's API
    puts "\n❌ #{e.message}"
    exit(1)
  end
end

def install_gem
  system("gem install ./instrumental-components-library-latest.gem --silent --no-document")
  FileUtils.rm('instrumental-components-library-latest.gem')
end

def run_bundle_install
  system("bundle install")
end

def run_installer
  system("rails g instrumental:install --license-key #{@license_key} --email #{@email}")
end

def update_gemfile
  gemfile_path = 'Gemfile'
  return unless File.exist?(gemfile_path)
  gemfile_content = File.read(gemfile_path)
  unless gemfile_content.include?("gem 'instrumental-components-library'")
    if gemfile_content.include?("group :development")
      # Add to existing development group
      gemfile_content.gsub!(/group :development\s+do/) do |match|
        "#{match}\n  gem 'instrumental-components-library'"
      end
    else
      # Create new development group
      gemfile_content += "\n\ngroup :development do\n  gem 'instrumental-components-library'\nend\n"
    end
    File.write(gemfile_path, gemfile_content)
    puts "✅ gem 'instrumental-components-library' has been added to the development group in your Gemfile."
  else
    puts "✅ gem 'instrumental-components-library' is already in your Gemfile."
  end
end