package steprun

import (
	"fmt"

	"git.novox.be/novox/mesh-sdk/go/buscalls"
)

// OutputsStore is the local name of the object store a build seat's holder keeps a run's answer in when it is over what
// step-ended carries inline (design 47 G A-254), as the holder's manifest `requires` asks for it with the template objects.
const OutputsStore = "outputs"

// OutputObjects is the object store of OutputsStore as a holder uses it (mesh-sdk busstate.ObjectsOf(OutputsStore)).
type OutputObjects interface {
	Put(name string, data []byte, description string) (buscalls.ObjectInfo, error)
	Get(name string) (buscalls.ObjectData, error)
}

// KeepOutputIn is a holder's Puller.KeepOutput over its store of outputs.
func KeepOutputIn(o OutputObjects) func(object string, body []byte) error {
	return func(object string, body []byte) error {
		if o == nil {
			return fmt.Errorf("this module keeps no %s store", OutputsStore)
		}
		_, err := o.Put(object, body, "a run's answer, named by its step-ended")
		return err
	}
}

// ReadOutputFrom is a holder's read of a kept answer for OutputTool over its store of outputs.
func ReadOutputFrom(o OutputObjects) func(object string) ([]byte, error) {
	return func(object string) ([]byte, error) {
		if o == nil {
			return nil, fmt.Errorf("this module keeps no %s store", OutputsStore)
		}
		got, err := o.Get(object)
		if err != nil {
			return nil, fmt.Errorf("the answer %s in the %s store: %w", object, OutputsStore, err)
		}
		return got.Data, nil
	}
}