#!/usr/bin/env ruby

require 'set'

# 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: 'Some EE extensions also map to its EE class spec, but this is not recommended: https://docs.gitlab.com/ee/development/ee_features.html#testing-ee-features-based-on-ce-features',
    source: 'ee/app/models/ee/user.rb',
    expected: ['ee/spec/models/user_spec.rb', 'spec/models/user_spec.rb']
  },

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

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

  {
    explanation: 'Tooling should map to respective spec',
    source: 'tooling/lib/tooling/test_file_finder.rb',
    expected: ['spec/tooling/lib/tooling/test_file_finder_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/user_spec.rb',
    expected: ['ee/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: ['spec/factories_spec.rb']
  },

  {
    explanation: 'EE factory should map to factories spec',
    source: 'ee/spec/factories/users.rb',
    expected: ['spec/factories_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: 'FOSS views should map to respective spec',
    source: 'app/views/admin/users/_user.html.haml',
    expected: ['spec/views/admin/users/_user.html.haml_spec.rb']
  },

  {
    explanation: 'EE views should map to respective spec',
    source: 'ee/app/views/admin/licenses/show.html.haml',
    expected: ['ee/spec/views/admin/licenses/show.html.haml_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/20191023152913_add_default_and_free_plans.rb',
    expected: ['spec/migrations/add_default_and_free_plans_spec.rb']
  },

  {
    explanation: 'Migration should map to its timestamped spec',
    source: 'db/post_migrate/20190924152703_migrate_issue_trackers_data.rb',
    expected: ['spec/migrations/20190924152703_migrate_issue_trackers_data_spec.rb']
  }
]

class MappingTest
  def initialize(explanation:, source:, expected:, mapping: 'tests.yml')
    @explanation = explanation
    @source = source
    @mapping = mapping
    @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 -f #{mapping} #{source}`.split(' ')
  end
end

results = tests.map { |test| MappingTest.new(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.'