package cmd

import (
	"axolotl/models"
	"axolotl/service"
	"strings"
)

// parseRelInput parses a rel string into a RelInput.
//
// Formats:
//   - "prefix::value"  → property rel with no target (tag)
//   - "relname:target" → edge rel with a target node
//   - "tagname"        → simple label rel with no target (alias for --tag)
func parseRelInput(s string) (service.RelInput, error) {
	if strings.Contains(s, "::") {
		// Property: name::value — no target node.
		return service.RelInput{Type: models.RelType(s), Target: ""}, nil
	}
	if idx := strings.Index(s, ":"); idx >= 0 {
		// Edge rel: relname:target.
		return service.RelInput{Type: models.RelType(s[:idx]), Target: s[idx+1:]}, nil
	}
	// Simple label tag — no target node.
	return service.RelInput{Type: models.RelType(s), Target: ""}, nil
}