package replication

// Event is one bounded input into the Phase 14 core skeleton.
// Events describe observation or intent; they do not perform side effects.
type Event interface {
	VolumeID() string
}

// AssignmentDelivered carries the desired local role and replica set.
type AssignmentDelivered struct {
	ID             string
	Epoch          uint64
	Role           VolumeRole
	Replicas       []ReplicaAssignment
	RecoveryTarget SessionKind
}

func (e AssignmentDelivered) VolumeID() string { return e.ID }

// RoleApplied confirms the local runtime applied the desired role.
type RoleApplied struct {
	ID string
}

func (e RoleApplied) VolumeID() string { return e.ID }

// ReceiverReadyObserved confirms replica receiver readiness.
type ReceiverReadyObserved struct {
	ID string
}

func (e ReceiverReadyObserved) VolumeID() string { return e.ID }

// ShipperConfiguredObserved confirms shipper wiring exists.
type ShipperConfiguredObserved struct {
	ID string
}

func (e ShipperConfiguredObserved) VolumeID() string { return e.ID }

// ShipperConnectedObserved confirms the shipper is connected.
type ShipperConnectedObserved struct {
	ID string
}

func (e ShipperConnectedObserved) VolumeID() string { return e.ID }

// DiagnosticShippedAdvanced updates sender-side diagnostic progress only.
type DiagnosticShippedAdvanced struct {
	ID         string
	ShippedLSN uint64
}

func (e DiagnosticShippedAdvanced) VolumeID() string { return e.ID }

// CommittedLSNAdvanced updates the committed boundary truth without implying
// replica durability or checkpoint advancement.
type CommittedLSNAdvanced struct {
	ID           string
	CommittedLSN uint64
}

func (e CommittedLSNAdvanced) VolumeID() string { return e.ID }

// BarrierAccepted advances authoritative durable progress.
type BarrierAccepted struct {
	ID         string
	FlushedLSN uint64
}

func (e BarrierAccepted) VolumeID() string { return e.ID }

// BarrierRejected marks the bounded path degraded until a later success clears it.
type BarrierRejected struct {
	ID     string
	Reason string
}

func (e BarrierRejected) VolumeID() string { return e.ID }

// CheckpointAdvanced updates the durable base-image boundary.
type CheckpointAdvanced struct {
	ID            string
	CheckpointLSN uint64
}

func (e CheckpointAdvanced) VolumeID() string { return e.ID }

// CatchUpPlanned freezes the current replay target as bounded recovery truth.
type CatchUpPlanned struct {
	ReplicaID string
	ID        string
	TargetLSN uint64
}

func (e CatchUpPlanned) VolumeID() string { return e.ID }

// RecoveryProgressObserved updates achieved replay/rebuild progress without
// implying publication or durability closure by itself.
type RecoveryProgressObserved struct {
	ReplicaID   string
	ID          string
	AchievedLSN uint64
}

func (e RecoveryProgressObserved) VolumeID() string { return e.ID }

// CatchUpCompleted closes a previously planned catch-up path at an explicit
// achieved boundary.
type CatchUpCompleted struct {
	ReplicaID   string
	ID          string
	AchievedLSN uint64
}

func (e CatchUpCompleted) VolumeID() string { return e.ID }

// NeedsRebuildObserved is a fail-closed rebuild escalation.
type NeedsRebuildObserved struct {
	ReplicaID string
	ID        string
	Reason    string
}

func (e NeedsRebuildObserved) VolumeID() string { return e.ID }

// RebuildStarted moves the recovery truth from blocked-needs-rebuild into an
// explicit rebuilding path with a frozen target.
type RebuildStarted struct {
	ReplicaID string
	ID        string
	TargetLSN uint64
}

func (e RebuildStarted) VolumeID() string { return e.ID }

// RebuildCommitted clears the rebuild condition with bounded durable truth.
type RebuildCommitted struct {
	ReplicaID     string
	ID            string
	AchievedLSN   uint64
	FlushedLSN    uint64
	CheckpointLSN uint64
}

func (e RebuildCommitted) VolumeID() string { return e.ID }