module SvelteOnRails
  module Lib
    class Utils

      def self.gem_app_dir
        File.expand_path('../../svelte_on_rails', __dir__) + '/'
      end

      def self.asset_path(filename)
        config = SvelteOnRails::Configuration.instance
        path = (config.frontend_folder + config.components_folder).join(filename)
        manifest = config.ssr_manifest
        manifest[path.to_s.sub(/\.svelte$/, '') + '.svelte']['file']
      end

      def self.file_exist_case_sensitive?(containing_dir, filename)
        # Combine the directory path and filename
        full_path = File.join(containing_dir, filename)

        # Check if the file exists and the path matches case-sensitively
        File.exist?(full_path) && Dir[File.join(containing_dir, "**/*")].any? do |f|
          f == full_path
        end
      end

      def self.component_files(filename, base_path: SvelteOnRails::Configuration.instance.components_folder_full)
        fn = (filename.match(/\.svelte$/) ? filename[0..-8] : filename)
        svelte_file = (base_path + fn).to_s + '.svelte'
        svelte_filename = fn + '.svelte'
        cnf = SvelteOnRails::Configuration.instance
        cf = cnf.rails_root.join('public', 'vite-ssr', asset_path(filename).sub(/.js$/, ''))

        {
          svelte_file: svelte_file,
          svelte_filename: svelte_filename,
          compiled_file: cf.to_s
        }
      end

      def self.watch_changes_and_precompile
        config = SvelteOnRails::Configuration.instance
        return unless config.watch_changes?

        mtime = Dir[File.join(config.components_folder_full, '**/*.svelte')].map do |file|
          File.mtime(file).to_f
        end.max || 0.0

        last = if Dir.exist?(config.ssr_dist_folder)
                 mtime_path = config.ssr_dist_folder.join('last_mtime')
                 (File.exist?(mtime_path) ? File.read(mtime_path).to_f : 0.0)
               end

        if !last || mtime > last
          precompile(mtime)
        end

      end

      def self.precompile(last_mtime = nil)
        config = SvelteOnRails::Configuration.instance

        # run build

        cmd = "#{config.rails_root.join('node_modules', '.bin', 'vite')} build --config vite-ssr.config.ts"

        stdout, stderr, status = Open3.capture3(cmd)

        warnings = stderr.to_s.split("\n")
        errors_matcher = Regexp.new('(Could not resolve|failed to resolve)')
        error_lines = warnings.select { |e| e.match(errors_matcher) }
        have_error = error_lines.present? || status.to_s.match(/exit 1/)

        # error handling

        if stderr.present?

          red_background = "\033[97;41m"
          light_blue_background = "\033[30;106m"
          clear_colors = "\033[0m"

          msg = "  +++  #{have_error ? 'ERROR' : 'WARNING'} compiling Svelte components#{have_error ? ' failed' : ''} («#{cmd}»)  +++  "
          puts "#{have_error ? red_background : light_blue_background}#{msg}#{clear_colors}"

          warnings.each do |e|
            if e.match(errors_matcher)
              red_font = "\033[31m"
              puts "#{red_background}  #{clear_colors}#{red_font} #{e}#{clear_colors}"
            else
              puts "#{light_blue_background}  #{clear_colors}#{e}"
            end
          end

          if have_error
            puts "#{red_background}  +++  End of error message  +++  #{clear_colors}"
          else
            puts "#{light_blue_background}  +++  End of compiling warnings  +++  #{clear_colors}"
          end
          puts "#{have_error ? red_background : light_blue_background}  +++  Run «npm run build:ssr» on the console to see the original error message  +++  #{clear_colors}"

          if have_error
            cl_str = if error_lines.present?
                       "#{error_lines.join("\n")}\n\n"
                     end
            raise "Svelte components compilation failed\n\n#{cl_str}Full message:\n+++\n#{stderr}+++\n\nYou can run «npm run build:ssr» on the console to see the original error message\n"
          end

        end

        puts stdout

        unless Dir.exist?(config.ssr_dist_folder)
          raise "Could not find dist folder: #{config.ssr_dist_folder}"
        end
        if last_mtime
          mtime_path = config.ssr_dist_folder.join('last_mtime')
          File.write(mtime_path, last_mtime.to_s)
        end

      end

      # Defining methods to log errors and warnings using Rails logger
      def self.puts_error(text)
        # Using Rails logger to log error with custom formatting
        caller_info = caller[1] =~ /`([^']*)'/ ? $1 : "unknown"
        Rails.logger.error("  => [svelte-on-rails] #{caller_info} ERROR")
        text.split("\n").each do |line|
          Rails.logger.error("  => #{line}")
        end
      end

      # Defining method to log warnings using Rails logger
      def self.puts_warning(text)
        # Using Rails logger to log warning with custom formatting
        caller_info = caller[1] =~ /`([^']*)'/ ? $1 : "unknown"
        Rails.logger.warn("  => [svelte-on-rails] #{caller_info} WARNING \e[0m")
        text.split("\n").each do |line|
          Rails.logger.warn("  => #{line}")
        end
      end
    end
  end
end