# frozen_string_literal: true

module JsDependency
  module Extractor
    class ExtractImportPath
      # @param [String] str
      def initialize(str)
        @str = str
      end

      # rubocop:disable Metrics/MethodLength, Metrics/AbcSize
      # @return [Array<String>]
      def call
        str = @str
        # import defaultExport from 'module-name';
        paths = str.gsub(/import\s+\S+\s+from\s+"([^"]+)"/).with_object([]) { |_, list| list << Regexp.last_match(1) }
        paths += str.gsub(/import\s+\S+\s+from\s+'([^']+)'/).with_object([]) { |_, list| list << Regexp.last_match(1) }

        # import * as name from \"module-name\";
        paths += str.gsub(/import\s+\S+\s+as\s+\S+\s+from\s+"([^"]+)"/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end
        paths += str.gsub(/import\s+\S+\s+as\s+\S+\s+from\s+'([^']+)'/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end

        # import { export1 } from \"module-name\";
        # import { export1 as alias1 } from "module-name";
        # import { export1 , export2 } from "module-name";
        # import { foo , bar } from "module-name/path/to/specific/un-exported/file";
        # import { export1 , export2 as alias2 , [...] } from "module-name";
        paths += str.gsub(/import\s+\{\s+.+\s+\}\s+from\s+"([^"]+)"/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end
        paths += str.gsub(/import\s+\{\s+.+\s+\}\s+from\s+'([^']+)'/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end

        # import defaultExport, { export1 [ , [...] ] } from "module-name";
        paths += str.gsub(/import\s+\S+,\s+\{\s+.+\s+\}\s+from\s+"([^"]+)"/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end
        paths += str.gsub(/import\s+\S+,\s+\{\s+.+\s+\}\s+from\s+'([^']+)'/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end

        # import defaultExport, * as name from "module-name";
        paths += str.gsub(/import\s+\S+,\s+.+\s+as\s+\S+\s+from\s+"([^"]+)"/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end
        paths += str.gsub(/import\s+\S+,\s+.+\s+as\s+\S+\s+from\s+'([^']+)'/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end

        # import "module-name";
        paths += str.gsub(/import\s+"([^"]+)"/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end
        paths += str.gsub(/import\s+'([^']+)'/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end

        # var promise = import("module-name");
        paths += str.gsub(/import\("([^"]+)"\)/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end
        paths += str.gsub(/import\('([^']+)'\)/).with_object([]) do |_, list|
          list << Regexp.last_match(1)
        end
        paths.uniq.sort
      end

      # rubocop:enable Metrics/MethodLength, Metrics/AbcSize

      def self.call(str)
        new(str).call
      end
    end
  end
end