package hostexec

import (
	"errors"
	"os"
)

// ProjectRootClient keeps the agent's status and cleanup hint. It never
// establishes a lifetime lock or participates in root admission.
func ProjectRootClient(dataDir string, state State) error {
	d, err := openLocal(dataDir)
	if err != nil {
		return err
	}
	defer d.close()
	if state.State == "settled" {
		old, err := d.read(state.Host)
		if errors.Is(err, os.ErrNotExist) {
			return nil
		}
		if err != nil {
			return err
		}
		if old.Host != state.Host || old.Incarnation != state.Incarnation || old.Op != state.Op {
			return ErrState
		}
		return d.remove(state.Host)
	}
	state.Process, err = currentControllerProcess()
	if err != nil {
		return err
	}
	return d.write(state)
}

// ClearRootClientMirror follows a successful tokenless root serving view.
// Removing this status hint conveys no execution or update authority.
func ClearRootClientMirror(dataDir, host string) error {
	d, err := openLocal(dataDir)
	if err != nil {
		return err
	}
	defer d.close()
	err = d.remove(host)
	if errors.Is(err, os.ErrNotExist) {
		return nil
	}
	return err
}