core

type FakeResource struct {
	ResourceMeta `json:"-"`

	Spec   FakeResourceSpec    `json:"spec"`
	Status *FakeResourceStatus `json:"status,omitempty"`
}

type FakeResourceSpec struct {
	FieldA []StringToken `json:"fieldA"`
}

type FakeResourceStatus struct {
	FieldB string `json:"fieldB"`
}

type LiteralStringToken string

type Resource interface {
	// resource's stack.
	Stack() Stack

	// resource's Type.
	Type() string

	// resource's ID within stack.
	ID() string
}

type ResourceFieldStringToken struct {
	// contains filtered or unexported fields
}

type ResourceMeta struct {
	// contains filtered or unexported fields
}

type ResourceVisitor interface {
	Visit(res Resource) error
}

type Stack interface {
	// stackID returns a unique ID for stack.
	StackID() StackID

	// Add a resource into stack.
	AddResource(res Resource) error

	// Add a dependency relationship between resources.
	AddDependency(dependee Resource, depender Resource) error

	// ListResources list all resources for specific type.
	// pResourceSlice must be a pointer to a slice of resources, which will be filled.
	ListResources(pResourceSlice interface{}) error

	// TopologicalTraversal visits resources in stack in topological order.
	TopologicalTraversal(visitor ResourceVisitor) error
}

type StackID types.NamespacedName

type StringToken interface {
	Token
	Resolve(ctx context.Context) (string, error)
}

type Token interface {
	// token's value resolution may depends on 0 or more Resources.
	Dependencies() []Resource
}