package stacks

import (
	"path/filepath"
	"strings"
	"testing"
)

// R-674 (v0.270.0): a pin equal to the ladder's newest `to` is AT THE HEAD — the log must not call it
// "older than the ladder".
//
// COMPANION RED-PROOF (REPORT.md): drop the head branch in nextLadderStep → "the head was called older
// than the ladder".
func TestR674_HeadIsNotCalledOlder(t *testing.T) {
	dir := t.TempDir()
	mustWrite(t, filepath.Join(dir, ".felhom.yml"), "display_name: X\nupdate_ladder:\n"+ladderLine(ladderA, ladderB)+ladderLine(ladderB, ladderC))
	mustWrite(t, filepath.Join(dir, "docker-compose.yml"), "services:\n  web:\n    image: "+ladderC+"\n")
	step, err := nextLadderStep(dir, map[string]string{"web": ladderC})
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(step.Why, "older than the ladder") || !strings.Contains(step.Why, "AT THE HEAD") {
		t.Fatalf("the head was called older than the ladder: %q", step.Why)
	}
	// Control: a pin the ladder does not know is still said so.
	step, _ = nextLadderStep(dir, map[string]string{"web": "nextcloud:30.0.0-apache"})
	if !strings.Contains(step.Why, "matches no update_ladder entry") {
		t.Fatalf("the unknown-pin sentence changed: %q", step.Why)
	}
}