# frozen_string_literal: true

require 'rake_helper'

RSpec.describe 'dev rake tasks' do
  before do
    Rake.application.rake_require 'tasks/gitlab/setup'
    Rake.application.rake_require 'tasks/gitlab/shell'
    Rake.application.rake_require 'tasks/dev'
    Rake.application.rake_require 'active_record/railties/databases'
    Rake.application.rake_require 'tasks/gitlab/db'
  end

  describe 'setup' do
    around do |example|
      old_force_value = ENV['force']

      # setup rake task sets the force env var, so reset it
      example.run

      ENV['force'] = old_force_value # rubocop:disable RSpec/EnvAssignment
    end

    subject(:setup_task) { run_rake_task('dev:setup') }

    let(:connections) { Gitlab::Database.database_base_models_with_gitlab_shared.values.map(&:connection) }

    it 'sets up the development environment', :aggregate_failures do
      expect(Rake::Task['gitlab:setup']).to receive(:invoke)

      expect(connections).to all(receive(:execute).with('SET statement_timeout TO 0'))
      expect(connections).to all(receive(:execute).with('ANALYZE'))
      expect(connections).to all(receive(:execute).with('RESET statement_timeout'))

      expect(Rake::Task['gitlab:shell:setup']).to receive(:invoke)

      setup_task
    end
  end

  describe 'load' do
    subject(:load_task) { run_rake_task('dev:load') }

    it 'eager loads the application', :aggregate_failures do
      expect(Rails.configuration).to receive(:eager_load=).with(true)
      expect(Rails.application).to receive(:eager_load!)

      load_task
    end
  end

  describe 'terminate_all_connections' do
    before do
      allow(ActiveRecord::Base).to receive(:clear_all_connections!)
    end

    let(:connections) do
      Gitlab::Database.database_base_models_with_gitlab_shared.values.filter_map do |model|
        model.connection if Gitlab::Database.db_config_share_with(model.connection_db_config).nil?
      end
    end

    def expect_connections_to_be_terminated
      expect(Gitlab::Database::EachDatabase).to receive(:each_database_connection)
        .with(include_shared: false)
        .and_call_original

      expect(connections).to all(receive(:execute).with(/SELECT pg_terminate_backend/))
    end

    def expect_connections_not_to_be_terminated
      connections.each do |connection|
        expect(connection).not_to receive(:execute)
      end
    end

    subject(:terminate_task) { run_rake_task('dev:terminate_all_connections') }

    it 'terminates all connections' do
      expect_connections_to_be_terminated

      expect(ActiveRecord::Base).to receive(:clear_all_connections!)

      terminate_task
    end

    context 'when in the production environment' do
      it 'does not terminate connections' do
        expect(Rails.env).to receive(:production?).and_return(true)
        expect_connections_not_to_be_terminated
        expect(ActiveRecord::Base).not_to receive(:clear_all_connections!)

        terminate_task
      end
    end

    context 'when a database is not found' do
      before do
        skip_if_multiple_databases_not_setup
      end

      it 'continues to next connection' do
        expect(connections.first).to receive(:execute).and_raise(ActiveRecord::NoDatabaseError)
        expect(connections.second).to receive(:execute).with(/SELECT pg_terminate_backend/)

        terminate_task
      end
    end
  end

  context 'multiple databases' do
    before do
      skip_if_multiple_databases_not_setup
    end

    context 'with a valid database' do
      describe 'copy_db:ci' do
        before do
          allow(Rake::Task['dev:terminate_all_connections']).to receive(:invoke)

          configurations = instance_double(ActiveRecord::DatabaseConfigurations)
          allow(ActiveRecord::Base).to receive(:configurations).and_return(configurations)
          allow(configurations).to receive(:configs_for).with(env_name: Rails.env, name: 'ci').and_return(ci_configuration)
        end

        subject(:load_task) { run_rake_task('dev:copy_db:ci') }

        let(:ci_configuration) { instance_double(ActiveRecord::DatabaseConfigurations::HashConfig, name: 'ci', database: '__test_db_ci') }

        it 'creates the database from main' do
          expect(ApplicationRecord.connection).to receive(:create_database).with(
            ci_configuration.database,
            template: ApplicationRecord.connection_db_config.database
          )

          expect(Rake::Task['dev:terminate_all_connections']).to receive(:invoke)

          load_task
        end

        context 'when the database already exists' do
          it 'prints out a warning' do
            expect(ApplicationRecord.connection).to receive(:create_database).and_raise(ActiveRecord::DatabaseAlreadyExists)

            expect { load_task }.to output(/Database '#{ci_configuration.database}' already exists/).to_stderr
          end
        end
      end
    end

    context 'with an invalid database' do
      it 'raises an error' do
        expect { run_rake_task('dev:copy_db:foo') }.to raise_error(RuntimeError, /Don't know how to build task/)
      end
    end
  end
end