package domain

import (
	"errors"

	"git.cin.su/m/Assistant/contracts/capability"
)

var ErrInvalidHealth = errors.New("invalid capability health")
var ErrUnsupportedHealthVersion = errors.New("unsupported capability health semantic version")

func ValidateHealth(health capability.Health) error {
	if health.CapabilityID == "" || health.Revision < 1 {
		return ErrInvalidHealth
	}
	switch health.SemanticVersion {
	case capability.HealthV1:
		if health.ObservedAtUnixMillis != nil {
			return ErrInvalidHealth
		}
	case capability.HealthV2:
		if health.ObservedAtUnixMillis == nil || *health.ObservedAtUnixMillis < 1 {
			return ErrInvalidHealth
		}
	default:
		return ErrUnsupportedHealthVersion
	}
	switch health.State {
	case capability.HealthAvailable:
		if health.Reason != capability.ReasonNone {
			return ErrInvalidHealth
		}
	case capability.HealthDegraded, capability.HealthUnavailable:
		if health.Reason == capability.ReasonNone || health.Reason == "" {
			return ErrInvalidHealth
		}
	default:
		return ErrInvalidHealth
	}
	return nil
}