# frozen_string_literal: true

require "hashdiff"

module NeetoCompliance
  class JsconfigVerifier < Base
    attr_accessor :diff

    def initialize
      @diff = []
    end

    def local_copy
      "app/javascript/jsconfig.json"
    end

    def commons_copy
      NeetoCompliance::NeetoCommons.path.join "common_files", "app", "javascript", "jsconfig.json"
    end

    def local_jsconfig_data
      @_local_jsconfig_data ||= JSON.parse(File.read(local_copy))
    end

    def required_jsconfig_data
      @_required_jsconfig_data ||= JSON.parse(File.read(commons_copy))
    end

    def verify_command
      self.diff = Hashdiff.best_diff(required_jsconfig_data, local_jsconfig_data)
      removed_symbol = "\-"
      modified_symbol = "\~"
      symbol_index = 0
      self.diff.any? { |p| /#{removed_symbol}|#{modified_symbol}/.match?(p[symbol_index]) }
    end

    def local_file_exists?
      File.file?(local_copy)
    end

    def valid?
      return false unless local_file_exists?

      is_modified_or_removed = verify_command
      !is_modified_or_removed
    end

    def autofix_command
      "cp #{commons_copy} #{local_copy}"
    end

    def upstream_copy
      "https://github.com/bigbinary/neeto-commons-backend/blob/stable/lib/neeto-commons-backend/common_files/app/javascript/jsconfig.json"
    end

    def autofix_suggestion
      base_message = %{
      Your jsconfig.json content doesn't match with the expected neeto-commons content.

      The following is the recommended jsconfig.json content in neeto ecosystem:
      1) View #{upstream_copy}
      2) Or open #{commons_copy}

      To fix, start by fully replacing app/javascript/jsconfig.json
      of your app with above mentioned content, by running the following:
      #{autofix_command.yellow}
      }

      # The following is an example diff:
      # [["-", "compilerOptions.moduleResolution", "NodeNext"],
      # ["~", "compilerOptions.module", "ESNext", "ESNex"],
      # ["+", "compilerOptions.paths.neetou", ["../../node_modules/@bigbinary/neetoui/**"]],
      # For the above diff, we only need to get the newly added items marked by "+"
      # and also check whether it's a "path" that has been added.
      capture_addition_into_paths_key = "(?=.*\+)(?=.*compilerOptions.paths)"
      new_paths = self.diff.select { |p| p.join =~ /#{capture_addition_into_paths_key}.*/ }
      if new_paths.empty?
        return base_message
      end

      custom_paths = Hash.new
      new_paths.each do |path|
        k = path[1].split(".").last
        v = path[2]
        custom_paths[k] = v
      end

      message = %{
      #{base_message}
      ==================================================
      It seems that you've also added some custom paths in your jsconfig. You can cherry pick and
      append the custom paths to app/javascript/jsconfig.json, if need be, after running above mentioned copy command.
      Refer the comments in #{upstream_copy}
      to see how to add custom paths.
      The following are the custom paths that we have detected in your app/javascript/jsconfig.json:
      #{JSON.pretty_generate(custom_paths).yellow}
      }
    end
  end
end