# frozen_string_literal: true

require 'rubycritic/source_control_systems/base'
require 'rubycritic/analysers_runner'
require 'rubycritic/revision_comparator'
require 'rubycritic/reporter'
require 'rubycritic/commands/base'
require 'rubycritic/commands/default'
require 'rubycritic/commands/utils/build_number_file'

module RubyCritic
  module Command
    class Compare < Default
      def initialize(options)
        super
        @build_number = 0
      end

      def execute
        compare_branches
        status_reporter.score = Config.feature_branch_score
        status_reporter
      end

      private

      attr_reader :paths, :status_reporter

      def compare_branches
        @build_number = Utils::BuildNumberFile.new.update_build_number
        set_root_paths
        original_no_browser_config = Config.no_browser
        Config.no_browser = true
        analyse_branch(:base_branch)
        analyse_branch(:feature_branch)
        Config.no_browser = original_no_browser_config
        analyse_modified_files
        compare_code_quality
      end

      def set_root_paths
        Config.base_root_directory = Pathname.new(branch_directory(:base_branch))
        Config.feature_root_directory = Pathname.new(branch_directory(:feature_branch))
        Config.compare_root_directory = Pathname.new("#{Config.root}/compare")
      end

      # switch branch and analyse files
      def analyse_branch(branch)
        SourceControlSystem::Git.switch_branch(Config.send(branch))
        critic = critique(branch)
        Config.send(:"#{branch}_score=", critic.score)
        Config.root = branch_directory(branch)
        report(critic)
      end

      # generate report only for modified files
      def analyse_modified_files
        modified_files = Config.feature_branch_collection.where(SourceControlSystem::Git.modified_files)
        analysed_modules = AnalysedModulesCollection.new(modified_files.map(&:path), modified_files)
        Config.root = "#{Config.root}/compare"
        report(analysed_modules)
      end

      def compare_code_quality
        build_details
        compare_threshold
      end

      # mark build as failed if the diff b/w the score of
      # two branches is greater than threshold value
      def compare_threshold
        return unless mark_build_fail?

        print("Threshold: #{Config.threshold_score}\n")
        print("Difference: #{(Config.base_branch_score - Config.feature_branch_score).abs}\n")
        abort('The score difference between the two branches is over the threshold.')
      end

      def mark_build_fail?
        Config.threshold_score >= 0 && threshold_reached?
      end

      def threshold_reached?
        (Config.base_branch_score - Config.feature_branch_score) > Config.threshold_score
      end

      def branch_directory(branch)
        "#{Config.root}/compare/#{Config.send(branch)}"
      end

      # create a txt file with the branch score details
      def build_details
        details = "Base branch (#{Config.base_branch}) score: #{Config.base_branch_score} \n"\
                  "Feature branch (#{Config.feature_branch}) score: #{Config.feature_branch_score} \n"
        File.open("#{Config.compare_root_directory}/build_details.txt", 'w') { |file| file.write(details) }
      end

      # store the analysed moduled collection based on the branch
      def critique(branch)
        module_collection = AnalysersRunner.new(paths).run
        Config.send(:"#{branch}_collection=", module_collection)
        RevisionComparator.new(paths).statuses = module_collection
      end
    end
  end
end