package buildrun

import (
	"strings"

	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-builder/builds"
	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-sdk/buildstep"
)

// The words of a key that failed on a transport fault (design 47 G §568, A-76): `transport fault: <class>, <seat> <node>,
// <cause>`, the class one of ADR 0664 §1's four, the seat and node the step's, the cause the last run's in the build
// module's words. No other failure opens `transport fault:`.

// TransportFaultPrefix opens the error of a key that failed on a transport fault.
const TransportFaultPrefix = builds.TransportFaultPrefix

// The classes of a transport fault.
const (
	ClassNoResponders = "no responders"
	ClassNameLookup   = "name lookup"
	ClassConnection   = "connection"
	ClassDeadline     = "deadline"
)

// FaultClass is the class of a call's error or a step's reason: the words the builder's retake reads a transport fault by
// (buildstep.PassingCause), read as no responders, a name lookup, a deadline or, for every other refused, reset or cut
// connection, a connection.
func FaultClass(cause string) string {
	c := strings.ToLower(cause)
	has := func(words ...string) bool {
		for _, w := range words {
			if strings.Contains(c, w) {
				return true
			}
		}
		return false
	}
	switch {
	case has("no responders", strings.ToLower(buildstep.HolderSilentWords), "jetstream not enabled"):
		return ClassNoResponders
	case has("no such host", "name resolution", "lookup ", "could not resolve", "enotfound", "eai_again"):
		return ClassNameLookup
	case has("deadline", "timeout", "timed out", "etimedout"):
		return ClassDeadline
	}
	return ClassConnection
}

// TransportFault is the error of a key that failed on a transport fault of the seat's step on node, with the cause of its
// last run.
func TransportFault(class, seat, node, cause string) string {
	return TransportFaultPrefix + " " + class + ", " + seat + " " + node + ", " + cause
}