module ReactOnRails::PackerUtils

def self.asset_uri_from_packer(asset_name)
  if dev_server_running?
    "#{dev_server_url}/#{public_output_uri_path}#{asset_name}"
  else
    File.join(packer_public_output_path, asset_name).to_s
  end
end

def self.bundle_js_uri_from_packer(bundle_name)
  hashed_bundle_name = ::Shakapacker.manifest.lookup!(bundle_name)
  # Support for hashing the server-bundle and having that built
  # the webpack-dev-server is provided by the config value
  # "same_bundle_for_client_and_server" where a value of true
  # would mean that the bundle is created by the webpack-dev-server
  is_bundle_running_on_server = bundle_name == ReactOnRails.configuration.server_bundle_js_file
  # Check Pro RSC bundle if Pro is available
  if ReactOnRails::Utils.react_on_rails_pro?
    is_bundle_running_on_server ||= (bundle_name == ReactOnRailsPro.configuration.rsc_bundle_js_file)
  end
  if ::Shakapacker.dev_server.running? && (!is_bundle_running_on_server ||
    ReactOnRails.configuration.same_bundle_for_client_and_server)
    "#{dev_server_url}#{hashed_bundle_name}"
  else
    File.expand_path(File.join("public", hashed_bundle_name)).to_s
  end
end

def self.check_manifest_not_cached
  return unless ::Shakapacker.config.cache_manifest?
  msg = <<-MSG.strip_heredoc
      ERROR: you have enabled cache_manifest in the #{Rails.env} env when using the
      ReactOnRails::TestHelper.configure_rspec_to_compile_assets helper
      To fix this: edit your config/shakapacker.yml file and set cache_manifest to false for test.
  MSG
  puts wrap_message(msg)
  exit!
end

def self.dev_server_running?
  Shakapacker.dev_server.running?
end

def self.dev_server_url
  "#{Shakapacker.dev_server.protocol}://#{Shakapacker.dev_server.host_with_port}"
end

def self.extract_precompile_hook
  # Access config data using private :data method since there's no public API
  # to access the raw configuration hash needed for hook detection
  config_data = ::Shakapacker.config.send(:data)
  # Try symbol keys first (Shakapacker's internal format), then fall back to string keys
  # The key is 'precompile_hook' at the top level of the config
  config_data&.[](:precompile_hook) || config_data&.[]("precompile_hook")
end

def self.hook_contains_generate_packs?(hook_value)
  # The hook value can be either:
  # 1. A direct command containing the rake task
  # 2. A path to a script file that needs to be read
  return false if hook_value.blank?
  # Check if it's a direct command first
  return true if hook_value.to_s.match?(/\breact_on_rails:generate_packs\b/)
  # Check if it's a script file path
  script_path = resolve_hook_script_path(hook_value)
  return false unless script_path && File.exist?(script_path)
  # Read and check script contents
  script_contents = File.read(script_path)
  script_contents.match?(/\breact_on_rails:generate_packs\b/)
rescue StandardError
  # If we can't read the script, assume it doesn't contain generate_packs
  false
end

def self.manifest_exists?
  ::Shakapacker.config.public_manifest_path.exist?
end

def self.nested_entries?
  ::Shakapacker.config.nested_entries?
end

def self.packer_public_output_path
  ::Shakapacker.config.public_output_path.to_s
end

def self.packer_source_entry_path
  ::Shakapacker.config.source_entry_path
end

def self.packer_source_path
  ::Shakapacker.config.source_path
end

def self.packer_source_path_explicit?
  ::Shakapacker.config.send(:data)[:source_path].present?
end

def self.precompile?
  ::Shakapacker.config.shakapacker_precompile?
end

def self.public_output_uri_path
  "#{::Shakapacker.config.public_output_path.relative_path_from(::Shakapacker.config.public_path)}/"
end

def self.raise_nested_entries_disabled
  msg = <<~MSG
    **ERROR** ReactOnRails: `nested_entries` is configured to be disabled in shakapacker. Please update \
    config/shakapacker.yml to enable nested entries. for more information read
    https://www.shakacode.com/react-on-rails/docs/guides/file-system-based-automated-bundle-generation.md#enable-nested_entries-for-shakapacker
  MSG
  raise ReactOnRails::Error, msg
end

def self.raise_shakapacker_version_incompatible_for_autobundling
  msg = <<~MSG
    **ERROR** ReactOnRails: Please upgrade ::Shakapacker to version #{ReactOnRails::PacksGenerator::MINIMUM_SHAKAPACKER_VERSION_FOR_AUTO_BUNDLING} or \
    above to use the automated bundle generation feature (which requires nested_entries support). \
    The currently installed version is #{ReactOnRails::PackerUtils.shakapacker_version}. \
    Basic pack generation requires ::Shakapacker #{ReactOnRails::PacksGenerator::MINIMUM_SHAKAPACKER_VERSION} or above.
  MSG
  raise ReactOnRails::Error, msg
end

def self.raise_shakapacker_version_incompatible_for_basic_pack_generation
  msg = <<~MSG
    **ERROR** ReactOnRails: Please upgrade ::Shakapacker to version #{ReactOnRails::PacksGenerator::MINIMUM_SHAKAPACKER_VERSION} or \
    above to use basic pack generation features. The currently installed version is #{ReactOnRails::PackerUtils.shakapacker_version}.
  MSG
  raise ReactOnRails::Error, msg
end

def self.resolve_hook_script_path(hook_value)
  # Hook value might be a script path relative to Rails root
  return nil unless defined?(Rails) && Rails.respond_to?(:root)
  potential_path = Rails.root.join(hook_value.to_s.strip)
  potential_path if potential_path.file?
end

def self.shakapacker_precompile_hook_configured?
  return false unless defined?(::Shakapacker)
  hook_value = extract_precompile_hook
  return false if hook_value.nil?
  hook_contains_generate_packs?(hook_value)
rescue StandardError => e
  # Swallow errors during hook detection to fail safe - if we can't detect the hook,
  # we should run generate_packs rather than skip it incorrectly.
  # Possible errors: NoMethodError (config method missing), TypeError (unexpected data structure),
  # or errors from shakapacker's internal implementation changes
  warn "Warning: Unable to detect shakapacker precompile hook: #{e.message}" if ENV["DEBUG"]
  false
end

def self.shakapacker_precompile_hook_value
  return nil unless defined?(::Shakapacker)
  extract_precompile_hook
rescue StandardError
  nil
end

def self.shakapacker_version
  return @shakapacker_version if defined?(@shakapacker_version)
  @shakapacker_version = Gem.loaded_specs["shakapacker"].version.to_s
end

def self.shakapacker_version_as_array
  return @shakapacker_version_as_array if defined?(@shakapacker_version_as_array)
  match = shakapacker_version.match(ReactOnRails::VersionChecker::VERSION_PARTS_REGEX)
  # match[4] is the pre-release version, not normally a number but something like "beta.1" or `nil`
  @shakapacker_version_as_array = [match[1].to_i, match[2].to_i, match[3].to_i, match[4]].compact
end

def self.shakapacker_version_requirement_met?(required_version)
  @version_checks ||= {}
  @version_checks[required_version] ||= Gem::Version.new(shakapacker_version) >= Gem::Version.new(required_version)
end

def self.supports_async_loading?
  shakapacker_version_requirement_met?("8.2.0")
end

def self.supports_autobundling?
  min_version = ReactOnRails::PacksGenerator::MINIMUM_SHAKAPACKER_VERSION_FOR_AUTO_BUNDLING
  ::Shakapacker.config.respond_to?(:nested_entries?) && shakapacker_version_requirement_met?(min_version)
end

def self.supports_basic_pack_generation?
  shakapacker_version_requirement_met?(ReactOnRails::PacksGenerator::MINIMUM_SHAKAPACKER_VERSION)
end

def self.webpack_assets_status_checker
  source_path = ReactOnRails::Utils.source_path
  generated_assets_full_path = ReactOnRails::Utils.generated_assets_full_path
  webpack_generated_files = ReactOnRails.configuration.webpack_generated_files
  @webpack_assets_status_checker ||= ReactOnRails::TestHelper::WebpackAssetsStatusChecker.new(
    source_path: source_path,
    generated_assets_full_path: generated_assets_full_path,
    webpack_generated_files: webpack_generated_files
  )
end