vertex

type Builder interface {
	// Build a new stop vertex from the parents
	BuildStopVtx(ctx context.Context, parentIDs []ids.ID) (avalanche.Vertex, error)
}

type DAGVM interface {
	block.ChainVM

	// Convert a stream of bytes to a transaction or return an error
	ParseTx(ctx context.Context, txBytes []byte) (snowstorm.Tx, error)
}

type LinearizableVM interface {
	DAGVM

	// Linearize is called after [Initialize] and after the DAG has been
	// finalized. After Linearize is called:
	//
	// - PendingTxs will never be called again
	// - GetTx will never be called again
	// - ParseTx may still be called
	// - All the block based functions of the [block.ChainVM] must work as
	//   expected.
	//
	// Linearize is part of the VM initialization, and will be called at most
	// once per VM instantiation. This means that Linearize should be called
	// every time the chain restarts after the DAG has finalized.
	Linearize(ctx context.Context, stopVertexID ids.ID) error
}

type LinearizableVMWithEngine interface {
	DAGVM

	// Linearize is called after [Initialize] and after the DAG has been
	// finalized. After Linearize is called:
	//
	// - PendingTxs will never be called again
	// - GetTx will never be called again
	// - ParseTx may still be called
	// - All the block based functions of the [block.ChainVM] must work as
	//   expected.
	//
	// Linearize is part of the VM initialization, and will be called at most
	// once per VM instantiation. This means that Linearize should be called
	// every time the chain restarts after the DAG has finalized.
	Linearize(
		ctx context.Context,
		stopVertexID ids.ID,
		toEngine chan<- common.Message,
	) error
}

type Manager interface {
	Builder
	Parser
	Storage
}

type Parser interface {
	// Parse a vertex from a slice of bytes
	ParseVtx(ctx context.Context, vertex []byte) (avalanche.Vertex, error)
}

type StatelessVertex interface {
	verify.Verifiable
	ID() ids.ID
	Bytes() []byte
	Version() uint16
	ChainID() ids.ID
	StopVertex() bool
	Height() uint64
	Epoch() uint32
	ParentIDs() []ids.ID
	Txs() [][]byte
}

type Storage interface {
	// Get a vertex by its hash from storage.
	GetVtx(ctx context.Context, vtxID ids.ID) (avalanche.Vertex, error)
	// Edge returns a list of accepted vertex IDs with no accepted children.
	Edge(ctx context.Context) (vtxIDs []ids.ID)
	// Returns "true" if accepted frontier ("Edge") is stop vertex.
	StopVertexAccepted(ctx context.Context) (bool, error)
}