package journal

// Priority is the "level" or severity of the message.
type Priority int

const (
	PriEmerg Priority = iota
	PriAlert
	PriCrit
	PriErr
	PriWarning
	PriNotice
	PriInfo
	PriDebug
)

// String returns the same value as Keyword.
func (pri Priority) String() string {
	return pri.Keyword()
}

// Keyword returns a keyword associated with the priority level. These should be
// recognisable to system operators.
func (pri Priority) Keyword() string {
	switch pri {
	case PriEmerg:
		return "emerg"
	case PriAlert:
		return "alert"
	case PriCrit:
		return "crit"
	case PriErr:
		return "err"
	case PriWarning:
		return "warning"
	case PriNotice:
		return "notice"
	case PriInfo:
		return "info"
	case PriDebug:
		return "debug"
	default:
		return "?"
	}
}

var priorityAttrKey = AttrKey{key: "PRIORITY"}

var priorityAttrMap = map[Priority]Attr{
	PriEmerg:   Attr{Key: priorityAttrKey, Value: []byte{'0'}},
	PriAlert:   Attr{Key: priorityAttrKey, Value: []byte{'1'}},
	PriCrit:    Attr{Key: priorityAttrKey, Value: []byte{'2'}},
	PriErr:     Attr{Key: priorityAttrKey, Value: []byte{'3'}},
	PriWarning: Attr{Key: priorityAttrKey, Value: []byte{'4'}},
	PriNotice:  Attr{Key: priorityAttrKey, Value: []byte{'5'}},
	PriInfo:    Attr{Key: priorityAttrKey, Value: []byte{'6'}},
	PriDebug:   Attr{Key: priorityAttrKey, Value: []byte{'7'}},
}

var unknownPriorityAttr = Attr{Key: priorityAttrKey, Value: []byte{'6'}}

// Attr returns an attribute value ready to be used in a journal entry.
func (pri Priority) Attr() Attr {
	if a, ok := priorityAttrMap[pri]; ok {
		return a
	}
	return unknownPriorityAttr
}