# frozen_string_literal: true

require "cases/helper"

module ActiveRecord
  module ConnectionAdapters
    class SchemaCacheTest < ActiveRecord::TestCase
      def setup
        @connection       = ActiveRecord::Base.connection
        @cache            = SchemaCache.new @connection
        @database_version = @connection.get_database_version
      end

      def test_primary_key
        assert_equal "id", @cache.primary_keys("posts")
      end

      def test_yaml_dump_and_load
        @cache.columns("posts")
        @cache.columns_hash("posts")
        @cache.data_sources("posts")
        @cache.primary_keys("posts")
        @cache.indexes("posts")

        new_cache = YAML.load(YAML.dump(@cache))
        assert_no_queries do
          assert_equal 12, new_cache.columns("posts").size
          assert_equal 12, new_cache.columns_hash("posts").size
          assert new_cache.data_sources("posts")
          assert_equal "id", new_cache.primary_keys("posts")
          assert_equal 1, new_cache.indexes("posts").size
          assert_equal @database_version.to_s, new_cache.database_version.to_s
        end
      end

      def test_yaml_loads_5_1_dump
        @cache = YAML.load(File.read(schema_dump_path))

        assert_no_queries do
          assert_equal 11, @cache.columns("posts").size
          assert_equal 11, @cache.columns_hash("posts").size
          assert @cache.data_sources("posts")
          assert_equal "id", @cache.primary_keys("posts")
        end
      end

      def test_yaml_loads_5_1_dump_without_indexes_still_queries_for_indexes
        @cache = YAML.load(File.read(schema_dump_path))

        # Simulate assignment in railtie after loading the cache.
        old_cache, @connection.schema_cache = @connection.schema_cache, @cache

        assert_queries :any, ignore_none: true do
          assert_equal 1, @cache.indexes("posts").size
        end
      ensure
        @connection.schema_cache = old_cache
      end

      def test_yaml_loads_5_1_dump_without_database_version_still_queries_for_database_version
        @cache = YAML.load(File.read(schema_dump_path))

        # Simulate assignment in railtie after loading the cache.
        old_cache, @connection.schema_cache = @connection.schema_cache, @cache

        # We can't verify queries get executed because the database version gets
        # cached in both MySQL and PostgreSQL outside of the schema cache.
        assert_nil @cache.instance_variable_get(:@database_version)
        assert_equal @database_version.to_s, @cache.database_version.to_s
      ensure
        @connection.schema_cache = old_cache
      end

      def test_primary_key_for_non_existent_table
        assert_nil @cache.primary_keys("omgponies")
      end

      def test_caches_columns
        columns = @cache.columns("posts")
        assert_equal columns, @cache.columns("posts")
      end

      def test_caches_columns_hash
        columns_hash = @cache.columns_hash("posts")
        assert_equal columns_hash, @cache.columns_hash("posts")
      end

      def test_caches_indexes
        indexes = @cache.indexes("posts")
        assert_equal indexes, @cache.indexes("posts")
      end

      def test_caches_database_version
        @cache.database_version # cache database_version

        assert_no_queries do
          assert_equal @database_version.to_s, @cache.database_version.to_s

          if current_adapter?(:Mysql2Adapter)
            assert_not_nil @cache.database_version.full_version_string
          end
        end
      end

      def test_clearing
        @cache.columns("posts")
        @cache.columns_hash("posts")
        @cache.data_sources("posts")
        @cache.primary_keys("posts")
        @cache.indexes("posts")

        @cache.clear!

        assert_equal 0, @cache.size
        assert_nil @cache.instance_variable_get(:@database_version)
      end

      def test_dump_and_load
        @cache.columns("posts")
        @cache.columns_hash("posts")
        @cache.data_sources("posts")
        @cache.primary_keys("posts")
        @cache.indexes("posts")

        @cache = Marshal.load(Marshal.dump(@cache))

        assert_no_queries do
          assert_equal 12, @cache.columns("posts").size
          assert_equal 12, @cache.columns_hash("posts").size
          assert @cache.data_sources("posts")
          assert_equal "id", @cache.primary_keys("posts")
          assert_equal 1, @cache.indexes("posts").size
          assert_equal @database_version.to_s, @cache.database_version.to_s
        end
      end

      def test_data_source_exist
        assert @cache.data_source_exists?("posts")
        assert_not @cache.data_source_exists?("foo")
      end

      def test_clear_data_source_cache
        @cache.clear_data_source_cache!("posts")
      end

      test "#columns_hash? is populated by #columns_hash" do
        assert_not @cache.columns_hash?("posts")

        @cache.columns_hash("posts")

        assert @cache.columns_hash?("posts")
      end

      test "#columns_hash? is not populated by #data_source_exists?" do
        assert_not @cache.columns_hash?("posts")

        @cache.data_source_exists?("posts")

        assert_not @cache.columns_hash?("posts")
      end

      private
        def schema_dump_path
          "test/assets/schema_dump_5_1.yml"
        end
    end
  end
end