# frozen_string_literal: true

require "base64"
require "sewing_kit/webpack/manifest"

module SewingKit
  module Webpack
    module Helper
      class UnknownAssetError < StandardError
      end

      Asset = Struct.new(:path, :integrity)

      def sewing_kit_assets(entrypoint_name, extension: "js")
        return "" unless entrypoint_name.present?

        assets = SewingKit::Webpack::Manifest.asset_dependencies(entrypoint_name, request.user_agent)

        raise UnknownAssetError, "#{entrypoint_name} was not found in manifest." if raise_unknown_error?(assets)
        return [] unless assets && assets[extension]

        dependencies = assets[extension]
        dependencies.map do |raw_asset|
          Asset.new(raw_asset["path"], raw_asset["integrity"])
        end
      end

      def sewing_kit_link_tag(*assets)
        options = assets.extract_options!

        tags = assets.uniq.map do |asset|
          next "" if asset.path == ""

          create_asset_tag(:link, asset, options)
        end

        safe_join(tags, "\n")
      end

      def sewing_kit_script_tag(*assets)
        options = assets.extract_options!
        tags = assets.map do |asset|
          next "" if asset.path == ""

          create_asset_tag(:script, asset, options)
        end

        safe_join(tags, "\n")
      end

      def sewing_kit_assets_bundle_name
        SewingKit::Webpack::Manifest.asset_bundle_name(request.user_agent)
      end

      private

      def create_asset_tag(tag_type, asset, tag_options)
        raise ArgumentError, "Invalid tag type: #{tag_type}" unless [:script, :link].include?(tag_type)

        options = tag_options.clone

        if tag_options[:integrity] && asset.integrity
          options[:integrity] = asset.integrity
        else
          options.delete(:integrity)
        end

        case tag_type
        when :script
          content_tag(:script, "", options.reverse_merge(src: asset.path))
        when :link
          tag(:link, options.reverse_merge(href: asset.path, rel: "stylesheet"))
        end
      end

      def serve_development_assets?
        return false if ENV["SK_SIMULATE_PRODUCTION"] == "1"

        Rails.env.development?
      end

      def raise_unknown_error?(assets)
        assets.nil? && serve_development_assets?
      end
    end
  end
end