package event

import (
	"fmt"
	"strings"
)

// Kind identifies the "type/category" of an event for routing and policy decisions.
//
// Kind is intentionally open-ended (stringly-typed), because different daemons will
// have different kinds:
//
//	weatherfeeder: "observation", "forecast", "alert"
//	newsfeeder:    "article", "breaking", ...
//	stockfeeder:   "quote", "bar", "news", ...
//
// Conventions (recommended, not required):
//   - lowercase
//   - words separated by underscores if needed
type Kind string

// ParseKind normalizes and validates a kind string.
// It lowercases and trims whitespace, and rejects empty values.
func ParseKind(s string) (Kind, error) {
	k := strings.ToLower(strings.TrimSpace(s))
	if k == "" {
		return "", fmt.Errorf("kind cannot be empty")
	}
	return Kind(k), nil
}