#!/usr/bin/env ruby
# frozen_string_literal: true

require 'set'
require 'test_file_finder'

# These tests run a sanity check on the mapping file `tests.yml`
# used with the `test_file_finder` gem (`tff`) to identify matching test files.
# The verification depend on the presence of actual test files,
# so they would fail if one of the test files mentioned here is deleted.
# To minimize the chance of this test failing due to unrelated changes,
# the test files are chosen to be critical files that are unlikely to be deleted in a typical merge request
tests = [
  {
    explanation: 'EE code should map to respective spec',
    source: 'ee/app/controllers/admin/licenses_controller.rb',
    expected: ['ee/spec/controllers/admin/licenses_controller_spec.rb']
  },

  {
    explanation: 'FOSS code should map to respective spec',
    source: 'app/finders/admin/projects_finder.rb',
    expected: ['spec/finders/admin/projects_finder_spec.rb']
  },

  {
    explanation: 'EE extension should map to its EE extension spec and its FOSS class spec',
    source: 'ee/app/finders/ee/projects_finder.rb',
    expected: ['ee/spec/finders/ee/projects_finder_spec.rb', 'spec/finders/projects_finder_spec.rb']
  },

  {
    explanation: 'EE lib should map to respective spec.',
    source: 'ee/lib/world.rb',
    expected: ['ee/spec/lib/world_spec.rb']
  },

  {
    explanation: 'FOSS lib should map to respective spec',
    source: 'lib/gitaly/server.rb',
    expected: ['spec/lib/gitaly/server_spec.rb']
  },

  {
    explanation: 'https://gitlab.com/gitlab-org/gitlab/-/issues/368628',
    source: 'lib/gitlab/usage_data_counters/foo.rb',
    expected: ['spec/lib/gitlab/usage_data_spec.rb']
  },

  {
    explanation: 'https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/54#note_1160811638',
    source: 'lib/gitlab/ci/config/base.rb',
    expected: ['spec/lib/gitlab/ci/yaml_processor_spec.rb']
  },

  {
    explanation: 'https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/54#note_1160811638',
    source: 'ee/lib/gitlab/ci/config/base.rb',
    expected: ['spec/lib/gitlab/ci/yaml_processor_spec.rb', 'ee/spec/lib/gitlab/ci/yaml_processor_spec.rb']
  },

  {
    explanation: 'Tooling should map to respective spec',
    source: 'tooling/danger/specs/project_factory_suggestion.rb',
    expected: ['spec/tooling/danger/specs/project_factory_suggestion_spec.rb']
  },

  {
    explanation: 'Map RuboCop related files to respective specs',
    source: 'rubocop/cop/gettext/static_identifier.rb',
    expected: ['spec/rubocop/cop/gettext/static_identifier_spec.rb']
  },

  {
    explanation: 'Initializers should map to respective spec',
    source: 'config/initializers/action_mailer_hooks.rb',
    expected: ['spec/initializers/action_mailer_hooks_spec.rb']
  },

  {
    explanation: 'DB structure should map to schema spec',
    source: 'db/structure.sql',
    expected: ['spec/db/schema_spec.rb']
  },

  {
    explanation: 'Migration should map to its non-timestamped spec',
    source: 'db/migrate/20221014034338_populate_releases_access_level_from_repository.rb',
    expected: ['spec/migrations/populate_releases_access_level_from_repository_spec.rb']
  },
  # rubocop:disable Layout/LineLength
  {
    explanation: 'Migration should map to its timestamped spec',
    source: 'db/post_migrate/20230105172120_sync_new_amount_used_with_amount_used_on_ci_namespace_monthly_usages_table.rb',
    expected: ['spec/migrations/20230105172120_sync_new_amount_used_with_amount_used_on_ci_namespace_monthly_usages_table_spec.rb']
  },
  # rubocop:enable Layout/LineLength
  {
    explanation: 'FOSS views should map to respective spec',
    source: 'app/views/admin/dashboard/index.html.haml',
    expected: ['spec/views/admin/dashboard/index.html.haml_spec.rb']
  },

  {
    explanation: 'EE views should map to respective spec',
    source: 'ee/app/views/subscriptions/new.html.haml',
    expected: ['ee/spec/views/subscriptions/new.html.haml_spec.rb']
  },

  {
    explanation: 'FOSS spec code should map to itself',
    source: 'spec/models/issue_spec.rb',
    expected: ['spec/models/issue_spec.rb']
  },

  {
    explanation: 'EE spec code should map to itself',
    source: 'ee/spec/models/ee/user_spec.rb',
    expected: ['ee/spec/models/ee/user_spec.rb', 'spec/models/user_spec.rb']
  },

  {
    explanation: 'EE extension spec should map to itself and the FOSS class spec',
    source: 'ee/spec/services/ee/notification_service_spec.rb',
    expected: ['ee/spec/services/ee/notification_service_spec.rb', 'spec/services/notification_service_spec.rb']
  },

  {
    explanation: 'FOSS factory should map to factories spec',
    source: 'spec/factories/users.rb',
    expected: ['ee/spec/models/factories_spec.rb']
  },

  {
    explanation: 'EE factory should map to factories spec',
    source: 'ee/spec/factories/users.rb',
    expected: ['ee/spec/models/factories_spec.rb']
  },

  {
    explanation: 'Whats New should map to its respective spec',
    source: 'data/whats_new/202101140001_13_08.yml',
    expected: ['spec/lib/release_highlights/validator_spec.rb']
  },

  {
    explanation: 'The documentation index page is used in this haml_lint spec',
    source: 'doc/index.md',
    expected: ['spec/haml_lint/linter/documentation_links_spec.rb']
  },

  {
    explanation: 'Spec for FOSS sidekiq worker',
    source: 'app/workers/new_worker.rb',
    expected: ['spec/workers/every_sidekiq_worker_spec.rb']
  },

  {
    explanation: 'Spec for EE sidekiq worker',
    source: 'ee/app/workers/new_worker.rb',
    expected: ['spec/workers/every_sidekiq_worker_spec.rb']
  },

  {
    explanation: 'Known events',
    source: 'lib/gitlab/usage_data_counters/known_events/common.yml',
    expected: ['spec/lib/gitlab/usage_data_counters/hll_redis_counter_spec.rb', 'spec/lib/gitlab/usage_data_spec.rb']
  },

  {
    explanation: 'FOSS mailer previews',
    source: 'app/mailers/previews/foo.rb',
    expected: ['spec/mailers/previews_spec.rb']
  },

  {
    explanation: 'EE mailer previews',
    source: 'ee/app/mailers/previews/foo.rb',
    expected: ['spec/mailers/previews_spec.rb']
  },

  {
    explanation: 'EE mailer extension previews',
    source: 'ee/app/mailers/previews/license_mailer_preview.rb',
    expected: ['spec/mailers/previews_spec.rb']
  },

  {
    explanation: 'GLFM spec and config files for CE and EE should map to respective markdown snapshot specs',
    source: 'glfm_specification/foo',
    expected: ['spec/requests/api/markdown_snapshot_spec.rb', 'ee/spec/requests/api/markdown_snapshot_spec.rb']
  },

  {
    explanation: 'https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/287#note_1192008962',
    # Note: The metrics seem to be changed every year or so, so this test will fail once a year or so.
    #       You will need to change the metric below for another metric present in the project.
    source: 'ee/config/metrics/counts_all/20221114065035_delete_merge_request.yml',
    expected: ['ee/spec/config/metrics/every_metric_definition_spec.rb']
  },

  {
    explanation: 'https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/287#note_1192008962',
    source: 'ee/lib/ee/gitlab/usage_data_counters/known_events/common.yml',
    expected: ['ee/spec/config/metrics/every_metric_definition_spec.rb']
  },
  {
    explanation: 'https://gitlab.com/gitlab-org/quality/engineering-productivity/team/-/issues/146',
    source: 'config/feature_categories.yml',
    expected: ['spec/db/docs_spec.rb', 'ee/spec/lib/ee/gitlab/database/docs/docs_spec.rb']
  },

  {
    explanation: 'https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/1360',
    source: 'vendor/project_templates/gitbook.tar.gz',
    expected: ['spec/lib/gitlab/project_template_spec.rb']
  },

  {
    explanation: 'https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/1683#note_1385966977',
    source: 'app/finders/members_finder.rb',
    expected: ['spec/finders/members_finder_spec.rb', 'spec/graphql/types/project_member_relation_enum_spec.rb']
  }
]

class MappingTest
  def initialize(explanation:, source:, expected:, strategy:)
    @explanation = explanation
    @source = source
    @strategy = strategy
    @expected_set = Set.new(expected)
    @actual_set = Set.new(actual)
  end

  def passed?
    expected_set.eql?(actual_set)
  end

  def failed?
    !passed?
  end

  def failure_message
    "#{explanation}: #{source}: Expected #{expected_set.to_a}, got #{actual_set.to_a}."
  end

  private

  attr_reader :explanation, :source, :expected_set, :actual_set, :mapping

  def actual
    tff = TestFileFinder::FileFinder.new(paths: [source])
    tff.use @strategy
    tff.test_files
  end
end

strategy = TestFileFinder::MappingStrategies::PatternMatching.load('tests.yml')
results = tests.map { |test| MappingTest.new(strategy: strategy, **test) }

failed_tests = results.select(&:failed?)
if failed_tests.any?
  puts <<~MESSAGE
    tff mapping verification failed:
    #{failed_tests.map(&:failure_message).join("\n")}
  MESSAGE

  exit 1
end

puts 'tff mapping verification passed.'