# frozen_string_literal: true

module GitlabQuality
  module TestTooling
    module Report
      # Uses the API to create GitLab issues for slow tests
      #
      # - Takes the JSON test reports like rspec-*.json`
      # - Takes a project where slow issues should be created
      # - Find issue by title (with test description or test file)
      # - Add test metadata, duration to the issue with group and category labels
      class SlowTestIssue < ReportAsIssue
        include Concerns::FindSetDri
        include Concerns::GroupAndCategoryLabels

        NEW_ISSUE_LABELS = Set.new(%w[test type::maintenance maintenance::performance priority::3 severity::3]).freeze
        SEARCH_LABELS = %w[test maintenance::performance].freeze

        MultipleIssuesFound = Class.new(StandardError)

        TestLevelSpecification = Struct.new(:regex, :max_duration)

        OTHER_TESTS_MAX_DURATION = 45.40 # seconds

        TEST_LEVEL_SPECIFICATIONS = [
          TestLevelSpecification.new(%r{/features/}, 50.13),
          TestLevelSpecification.new(%r{/controllers|requests/}, 19.20),
          TestLevelSpecification.new(%r{/lib/}, 27.12)
        ].freeze

        private

        def run!
          puts "Reporting slow tests in `#{files.join(',')}` as issues in project `#{project}` via the API at `#{Runtime::Env.gitlab_api_base}`."

          TestResults::Builder.new(files).test_results_per_file do |test_results|
            puts "=> Reporting #{test_results.count} tests in #{test_results.path}"

            test_results.each do |test|
              create_slow_issue(test) if should_create_slow_issue?(test)
            end
          end
        end

        def new_issue_title(test)
          "Slow test in #{super}"
        end

        def new_issue_description(test)
          super + [
            "\n### Slow test",
            "Slow tests detected, see guides for more details and how to improve them:",
            "- [Top slow tests](https://docs.gitlab.com/ee/development/testing_guide/best_practices.html#top-slow-tests)",
            "- [Test speed](https://docs.gitlab.com/ee/development/testing_guide/best_practices.html#test-speed)",
            "**Duration**: #{test.run_time} seconds"
          ].compact.join("\n\n")
        end

        def create_slow_issue(test)
          puts "   => Finding existing issues for slow test '#{test.name}' (run time: #{test.run_time} seconds)..."

          issue = find_issue(test)

          puts "   => Existing issue link #{issue['web_url']}" if issue.present?

          create_issue(test) unless issue.present?
        rescue MultipleIssuesFound => e
          warn(e.message)
        end

        def find_issue(test)
          search_labels = SEARCH_LABELS

          gitlab.find_issues(options: { state: 'opened', labels: search_labels.to_a }).find do |issue|
            issue_title = issue.title.strip
            issue_title.include?(test.name) || issue_title.include?(partial_file_path(test.file))
          end
        end

        def should_create_slow_issue?(test)
          test.run_time > max_duration_for_test(test)
        end

        def max_duration_for_test(test)
          test_level_specification = TEST_LEVEL_SPECIFICATIONS.find do |test_level_specification|
            test.example_id =~ test_level_specification.regex
          end
          return OTHER_TESTS_MAX_DURATION unless test_level_specification

          test_level_specification.max_duration
        end
      end
    end
  end
end