# 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(['test', 'type::maintenance', 'maintenance::performance', 'priority::3', 'severity::3', 'rspec profiling', 'rspec:slow test']).freeze
        SEARCH_LABELS = %w[test maintenance::performance].freeze

        JOB_URL_REGEX = %r{(?<job_url>https://(?<host>[\w.]+)/(?<project_path>[\w\-./]+)/-/jobs/\d+)}
        REPORT_ITEM_REGEX = /^1\. \d{4}-\d{2}-\d{2}: #{JOB_URL_REGEX} \((?<pipeline_url>.+)\)$/

        MultipleIssuesFound = Class.new(StandardError)

        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 test.slow_test?
            end
          end

          write_issues_log_file
        end

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

        def new_issue_description(test)
          super +
            <<~DESCRIPTION.chomp
              Slow tests were detected, please see the [test speed best practices guide](https://docs.gitlab.com/ee/development/testing_guide/best_practices.html#test-speed)
              to improve them. More context available about this issue in the [top slow tests guide](https://docs.gitlab.com/ee/development/testing_guide/best_practices.html#top-slow-tests).

              Add `allowed_to_be_slow: true` to the RSpec test if this is a legit slow test and close the issue.

              #{reports_section(test)}
            DESCRIPTION
        end

        def reports_section(test)
          <<~REPORTS
          ### Reports (1)

          #{report_list_item(test)}
          REPORTS
        end

        def report_list_item(test)
          "1. #{Time.new.utc.strftime('%F')}: #{test.ci_job_url} (#{ENV.fetch('CI_PIPELINE_URL', 'pipeline url is missing')})"
        end

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

          issues = find_issues(test, SEARCH_LABELS, state: 'opened')

          if issues.blank?
            issues << create_issue(test)
          else
            issues.each do |issue|
              puts "   => Existing issue link #{issue['web_url']}"

              update_reports(issue, test)
            end
          end

          collect_issues(test, issues)
        rescue MultipleIssuesFound => e
          warn(e.message)
        end

        def update_reports(issue, test)
          # We reopen closed issues to not lose any history
          state_event = issue.state == 'closed' ? 'reopen' : nil

          issue_attrs = {
            description: up_to_date_issue_description(issue.description, test)
          }

          issue_attrs[:state_event] = state_event if state_event

          gitlab.edit_issue(iid: issue.iid, options: issue_attrs)
          puts "  => Added a report in '#{issue.title}': #{issue.web_url}!"
        end

        def up_to_date_issue_description(issue_description, test)
          new_issue_description =
            if issue_description.include?('### Reports')
              # We count the number of existing reports.
              reports_count = issue_description
                .scan(REPORT_ITEM_REGEX)
                .size.to_i + 1
              issue_description.sub(/^### Reports.*$/, "### Reports (#{reports_count})")
            else # For issue with the legacy format, we add the Reports section
              reports_count = issue_description
                .scan(JOB_URL_REGEX)
                .size.to_i + 1

              "#{issue_description}\n\n### Reports (#{reports_count})"
            end

          "#{new_issue_description}\n#{report_list_item(test)}"
        end
      end
    end
  end
end