package model

// InstanceState 描述流程执行状态，独立的 Paused 标记控制是否允许新工作。
type InstanceState string

const (
	InstanceRunning     InstanceState = "RUNNING"
	InstanceWaiting     InstanceState = "WAITING"
	InstanceCancelling  InstanceState = "CANCELLING"
	InstanceNeedsReview InstanceState = "NEEDS_REVIEW"
	InstanceSucceeded   InstanceState = "SUCCEEDED"
	InstanceFailed      InstanceState = "FAILED"
	InstanceCancelled   InstanceState = "CANCELLED"
)

func (s InstanceState) Terminal() bool {
	return s == InstanceSucceeded || s == InstanceFailed || s == InstanceCancelled
}
func (i Instance) AllowsNewWork() bool {
	return !i.Paused && i.StopKind == nil && i.CancelRequestedAt == nil && (i.State == InstanceRunning || i.State == InstanceWaiting)
}

type NodeKind string

const (
	NodeTask     NodeKind = "TASK"     // 通过 Pulse 执行业务处理器。
	NodeBranch   NodeKind = "BRANCH"   // 按已保存结果选择条件路径。
	NodeParallel NodeKind = "PARALLEL" // 展开有界并行分支。
	NodeJoin     NodeKind = "JOIN"     // 按规则汇合并行结果。
	NodeSignal   NodeKind = "SIGNAL"   // 等待业务信号。
	NodeTimer    NodeKind = "TIMER"    // 等待指定时间。
	NodePoll     NodeKind = "POLL"     // 有界重复查询节点。
)

type StepState string

const (
	StepBlocked     StepState = "BLOCKED"
	StepReady       StepState = "READY"
	StepActive      StepState = "ACTIVE"
	StepWaiting     StepState = "WAITING"
	StepNeedsReview StepState = "NEEDS_REVIEW"
	StepSucceeded   StepState = "SUCCEEDED"
	StepFailed      StepState = "FAILED"
	StepCancelled   StepState = "CANCELLED"
	StepSkipped     StepState = "SKIPPED"
)

type WaitState string

const (
	WaitWaiting   WaitState = "WAITING"
	WaitSatisfied WaitState = "SATISFIED"
	WaitExpired   WaitState = "EXPIRED"
	WaitCancelled WaitState = "CANCELLED"
)

type SignalState string

const (
	SignalPending  SignalState = "PENDING"
	SignalConsumed SignalState = "CONSUMED"
	SignalExpired  SignalState = "EXPIRED"
	SignalRejected SignalState = "REJECTED"
)

type InboxState string

const (
	InboxPending     InboxState = "PENDING"
	InboxLeased      InboxState = "LEASED"
	InboxProcessed   InboxState = "PROCESSED"
	InboxQuarantined InboxState = "QUARANTINED"
)