const (
	// EventIntermediate declares intermediate event type
	//
	// Warning: This is an experimental feature and could change at any time
	EventIntermediate = Event(iota)

	// EventDone declares done event type
	//
	// Warning: This is an experimental feature and could change at any time
	EventDone
)

type Client interface {
	closer.Closer

	// CreateSession returns session or error for manually control of session lifecycle
	// CreateSession do not provide retry loop for failed create session requests.
	// Best effort policy may be implements with outer retry loop includes CreateSession call
	CreateSession(ctx context.Context, opts ...Option) (s ClosableSession, err error)

	// Do provide the best effort for execute operation
	// Do implements internal busy loop until one of the following conditions is met:
	// - deadline was canceled or deadlined
	// - retry operation returned nil as error
	// Warning: if context without deadline or cancellation func than Do can run indefinitely
	Do(ctx context.Context, op Operation, opts ...Option) error

	// DoTx provide the best effort for execute transaction
	// DoTx implements internal busy loop until one of the following conditions is met:
	// - deadline was canceled or deadlined
	// - retry operation returned nil as error
	// DoTx makes auto begin, commit and rollback of transaction
	// If op TxOperation returns nil - transaction will be committed
	// If op TxOperation return non nil - transaction will be rollback
	// Warning: if context without deadline or cancellation func than DoTx can run indefinitely
	DoTx(ctx context.Context, op TxOperation, opts ...Option) error
}

type ClosableSession interface {
	closer.Closer
	Session
}

type DataQuery interface {
	String() string
	ID() string
	YQL() string
}

type DataQueryExplanation struct {
	Explanation

	AST string
}

type Event uint8

type Explanation struct {
	Plan string
}

type Operation func(ctx context.Context, s Session) error

type Option func(o *Options)

type Options struct {
	Idempotent      bool
	TxSettings      *TransactionSettings
	TxCommitOptions []options.CommitTransactionOption
	FastBackoff     retry.Backoff
	SlowBackoff     retry.Backoff
	Trace           trace.Table

	// IsTraceError checks err before submit trace
	//
	// Warning: This is an experimental feature and could change at any time
	IsTraceError func(event Event, err error) bool
}

type ParameterOption func(queryParams)

type QueryParameters struct {
	// contains filtered or unexported fields
}

type ScriptingYQLExplanation struct {
	Explanation

	ParameterTypes map[string]types.Type
}

type Session interface {
	SessionInfo

	CreateTable(
		ctx context.Context,
		path string,
		opts ...options.CreateTableOption,
	) (err error)
	DescribeTable(
		ctx context.Context,
		path string,
		opts ...options.DescribeTableOption,
	) (desc options.Description, err error)
	DropTable(
		ctx context.Context,
		path string,
		opts ...options.DropTableOption,
	) (err error)
	AlterTable(
		ctx context.Context,
		path string,
		opts ...options.AlterTableOption,
	) (err error)
	CopyTable(
		ctx context.Context,
		dst, src string,
		opts ...options.CopyTableOption,
	) (err error)
	Explain(
		ctx context.Context,
		query string,
	) (exp DataQueryExplanation, err error)
	Prepare(
		ctx context.Context,
		query string,
	) (stmt Statement, err error)
	Execute(
		ctx context.Context,
		tx *TransactionControl,
		query string,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (txr Transaction, r result.Result, err error)
	ExecuteSchemeQuery(
		ctx context.Context,
		query string,
		opts ...options.ExecuteSchemeQueryOption,
	) (err error)
	DescribeTableOptions(
		ctx context.Context,
	) (desc options.TableOptionsDescription, err error)
	StreamReadTable(
		ctx context.Context,
		path string,
		opts ...options.ReadTableOption,
	) (r result.StreamResult, err error)
	StreamExecuteScanQuery(
		ctx context.Context,
		query string,
		params *QueryParameters,
		opts ...options.ExecuteScanQueryOption,
	) (_ result.StreamResult, err error)
	BulkUpsert(
		ctx context.Context,
		table string,
		rows types.Value,
	) (err error)
	BeginTransaction(
		ctx context.Context,
		tx *TransactionSettings,
	) (x Transaction, err error)
	KeepAlive(
		ctx context.Context,
	) error
}

type SessionInfo interface {
	ID() string
}

type Statement interface {
	Execute(
		ctx context.Context,
		tx *TransactionControl,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (txr Transaction, r result.Result, err error)
	NumInput() int
	Text() string
}

type Transaction interface {
	TransactionActor

	CommitTx(
		ctx context.Context,
		opts ...options.CommitTransactionOption,
	) (r result.Result, err error)
	Rollback(
		ctx context.Context,
	) (err error)
}

type TransactionActor interface {
	TransactionIdentifier

	Execute(
		ctx context.Context,
		query string,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (result.Result, error)
	ExecuteStatement(
		ctx context.Context,
		stmt Statement,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (result.Result, error)
}

type TransactionControl struct {
	// contains filtered or unexported fields
}

type TransactionIdentifier interface {
	ID() string
}

type TransactionSettings struct {
	// contains filtered or unexported fields
}

type TxControlOption func(*txControlDesc)

type TxOnlineReadOnlyOption func(*txOnlineReadOnly)

type TxOperation func(ctx context.Context, tx TransactionActor) error

type TxOption func(*txDesc)