fold

type Deps struct {
	Engine Engine
	actions.MutationDeps
}

type Engine interface {
	validation.GitOperationEngine
	actions.OwnershipEngine
	Trunk() engine.Branch
	Graph(ctx context.Context, strategy engine.SortStrategy) *engine.StackGraph
	GetRevision(ctx context.Context, branch engine.Branch) (string, error)
	GetMergeBase(ctx context.Context, rev1, rev2 string) (string, error)
	ShowDiff(ctx context.Context, rr git.RevRange, format git.DiffFormat) (string, error)
	CheckoutBranch(ctx context.Context, branch engine.Branch) error
	Merge(ctx context.Context, revision string, opts engine.MergeOptions) error
	DeleteBranch(ctx context.Context, branch engine.Branch) error
	SetParent(ctx context.Context, branch engine.Branch, parentBranch engine.Branch, mode engine.DivergenceMode) error
	ReparentBranchesToParents(ctx context.Context, moves []engine.BranchParentMove, opts engine.ReparentOpts) error
}

type Handler interface {
	// Start is called at the beginning of fold
	Start(currentBranch, parentBranch string, dryRun bool)

	// OnStep is called for each step in the fold process
	OnStep(step Step, status handler.StepStatus, message string)

	// Complete is called when fold finishes
	Complete(result Result)

	// Cleanup restores terminal state (may be no-op)
	Cleanup()

	// IsInteractive returns true if the handler supports interactive prompts
	IsInteractive() bool
}

type NullHandler struct {
	handler.NullBase
	handler.NullProgress[Step]
}

type Options struct {
	Keep       bool // If true, keeps the name of the current branch instead of using the name of its parent
	AllowTrunk bool // If true, allows folding into the trunk branch
	DryRun     bool // If true, only shows what would happen
}

type Result struct {
	FoldedBranch  string
	IntoBranch    string
	ChildrenCount int
}

type Step string