module GeneratorMessages

def add_error(message)
  output << format_error(message)
end

def add_info(message)
  output << format_info(message)
end

def add_warning(message)
  output << format_warning(message)
end

def build_process_manager_section
  process_manager = detect_process_manager
  if process_manager
    if process_manager == "overmind"
      "\n📦 #{Rainbow("#{process_manager} detected ✓").green} " \
        "#{Rainbow('(Recommended for easier debugging)').blue}"
    else
      "\n📦 #{Rainbow("#{process_manager} detected ✓").green}"
    end
  else
    <<~INSTALL
      ⚠️  No process manager detected. Install one:
      #{Rainbow('brew install overmind').yellow.bold}  # Recommended (easier debugging)
      #{Rainbow('gem install foreman').yellow}   # Alternative
    INSTALL
  end
end

def build_shakapacker_status_section
  version_warning = check_shakapacker_version_warning
  if File.exist?(".shakapacker_just_installed")
    base_message = <<~SHAKAPACKER
      📦 SHAKAPACKER SETUP:
      ─────────────────────────────────────────────────────────────────────────
      #{Rainbow('✓ Added to Gemfile automatically').green}
      #{Rainbow('✓ Installer ran successfully').green}
      #{Rainbow('✓ Webpack integration configured').green}
    SHAKAPACKER
    base_message + version_warning
  elsif File.exist?("bin/shakapacker") && File.exist?("bin/shakapacker-dev-server")
    "\n📦 #{Rainbow('Shakapacker already configured ✓').green}#{version_warning}"
  else
    "\n📦 #{Rainbow('Shakapacker setup may be incomplete').yellow}#{version_warning}"
  end
end

def build_testing_section
  # Check if we have any spec files to determine if testing setup is needed
  has_spec_files = File.exist?("spec/rails_helper.rb") || File.exist?("spec/spec_helper.rb")
  return "" if has_spec_files
  <<~TESTING
    🧪 TESTING SETUP (Optional):
    ─────────────────────────────────────────────────────────────────────────
    For JavaScript testing with asset compilation, add this to your RSpec config:
    # In spec/rails_helper.rb or spec/spec_helper.rb:
    ReactOnRails::TestHelper.configure_rspec_to_compile_assets(config)
  TESTING
end

def check_shakapacker_version_warning
  # Try to detect Shakapacker version from Gemfile.lock
  return "" unless File.exist?("Gemfile.lock")
  gemfile_lock_content = File.read("Gemfile.lock")
  shakapacker_match = gemfile_lock_content.match(/shakapacker \((\d+\.\d+\.\d+)\)/)
  return "" unless shakapacker_match
  version = shakapacker_match[1]
  major_version = version.split(".").first.to_i
  if major_version < 8
    <<~WARNING
      ⚠️  #{Rainbow('IMPORTANT: Upgrade Recommended').yellow.bold}
      ─────────────────────────────────────────────────────────────────────────
      You are using Shakapacker #{version}. React on Rails v15+ works best with
      Shakapacker 8.0+ for optimal Hot Module Replacement and build performance.
      To upgrade: #{Rainbow('bundle update shakapacker').cyan}
      Learn more: #{Rainbow('https://github.com/shakacode/shakapacker').cyan.underline}
    WARNING
  else
    ""
  end
rescue StandardError
  # If version detection fails, don't show a warning to avoid noise
  ""
end

def clear
  @output = []
end

def detect_package_manager
  # Check for lock files to determine package manager
  if File.exist?("yarn.lock")
    "yarn"
  elsif File.exist?("pnpm-lock.yaml")
    "pnpm"
  else
    # Default to npm (Shakapacker 8.x default) - covers package-lock.json and no lockfile
    "npm"
  end
end

def detect_process_manager
  if system("which overmind > /dev/null 2>&1")
    "overmind"
  elsif system("which foreman > /dev/null 2>&1")
    "foreman"
  end
end

def format_error(msg)
  Rainbow("ERROR: #{msg}").red
end

def format_info(msg)
  Rainbow(msg.to_s).green
end

def format_warning(msg)
  Rainbow("WARNING: #{msg}").orange
end

def helpful_message_after_installation(component_name: "HelloWorld", route: "hello_world")
  process_manager_section = build_process_manager_section
  testing_section = build_testing_section
  package_manager = detect_package_manager
  shakapacker_status = build_shakapacker_status_section
  <<~MSG
    ╔════════════════════════════════════════════════════════════════════════╗
    ║  🎉 React on Rails Successfully Installed!                             ║
    ╚════════════════════════════════════════════════════════════════════════╝
    #{process_manager_section}#{shakapacker_status}
    📋 QUICK START:
    ─────────────────────────────────────────────────────────────────────────
    1. Install dependencies:
       #{Rainbow("bundle && #{package_manager} install").cyan}
    2. Start the app:
       ./bin/dev              # HMR (Hot Module Replacement) mode
       ./bin/dev static       # Static bundles (no HMR, faster initial load)
       ./bin/dev prod         # Production-like mode for testing
       ./bin/dev help         # See all available options
    3. Visit: #{Rainbow(route ? "http://localhost:3000/#{route}" : 'http://localhost:3000').cyan.underline}
    ✨ KEY FEATURES:
    ─────────────────────────────────────────────────────────────────────────
    • Auto-registration enabled - Your layout only needs:
      <%= javascript_pack_tag %>
      <%= stylesheet_pack_tag %>
    • Server-side rendering - Enabled with prerender option in app/views/hello_world/index.html.erb:
      <%= react_component("#{component_name}", props: @hello_world_props, prerender: true) %>
    📚 LEARN MORE:
    ─────────────────────────────────────────────────────────────────────────
    • Documentation: #{Rainbow('https://www.shakacode.com/react-on-rails/docs/').cyan.underline}
    • Webpack customization: #{Rainbow('https://github.com/shakacode/shakapacker#webpack-configuration').cyan.underline}
    💡 TIP: Run 'bin/dev help' for development server options and troubleshooting#{testing_section}
  MSG
end

def messages
  output
end

def output
  @output ||= []
end