babe

type AllowedSlots struct {
	sc.VaryingData
}

type AuthorityIndex = sc.U32

type Configuration struct {
	// The slot duration in milliseconds for BABE. Currently, only
	// the value provided by this type at genesis will be used.
	//
	// Dynamic slot duration may be supported in the future.
	SlotDuration sc.U64

	// The duration of epochs in slots.
	EpochLength sc.U64

	// A constant value that is used in the threshold calculation formula.
	// In the threshold formula calculation, `1 - c` represents the probability
	// of a slot being empty.
	C primitives.Tuple2U64

	// The authorities
	Authorities sc.Sequence[primitives.Authority]

	// The randomness
	Randomness Randomness

	// Type of allowed slots.
	AllowedSlots AllowedSlots
}

type Epoch struct {
	// The epoch index.
	EpochIndex sc.U64
	// The starting slot of the epoch.
	StartSlot Slot
	// The duration of this epoch.
	Duration sc.U64
	// The authorities and their weights.
	Authorities sc.Sequence[primitives.Authority]
	// Randomness for this epoch.
	Randomness Randomness
	// Configuration of the epoch.
	Config EpochConfiguration
}

type EpochConfiguration struct {
	// A constant value that is used in the threshold calculation formula.
	// In the threshold formula calculation, `1 - c` represents the probability
	// of a slot being empty.
	C primitives.Tuple2U64

	// Whether this chain should run with secondary slots, which are assigned
	// in round-robin manner.
	AllowedSlots AllowedSlots
}

type EpochStartBlocks struct {
	Previous sc.U64
	Current  sc.U64
}

type PreDigest struct {
	sc.VaryingData
}

type PrimaryPreDigest struct {
	AuthorityIndex AuthorityIndex
	Slot           Slot
	VrfSignature   types.VrfSignature
}

type Randomness = sc.FixedSequence[sc.U8]

type SecondaryPlainPreDigest struct {
	// This is not strictly-speaking necessary, since the secondary slots
	// are assigned based on slot number and epoch randomness. But including
	// it makes things easier for higher-level users of the chain data to
	// be aware of the author of a secondary-slot block.
	AuthorityIndex AuthorityIndex
	Slot           Slot
}

type SecondaryVRFPreDigest struct {
	AuthorityIndex AuthorityIndex
	Slot           Slot
	VrfSignature   types.VrfSignature
}

type SessionIndex = sc.U32

type SkippedEpoch struct {
	sc.U64
	SessionIndex
}

type Slot = sc.U64