package main

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

// A component's version comes from where it sits, not from its linker (novox/hq ADR 0142). The mesh's
// toolchain stamps no version — a build does not know what it will be called — so a delivered host
// read as "development build" and the mesh could not tell which host a machine ran (04-ISSUES/161).

func TestADeliveredHostReadsItsVersionFromItsPath(t *testing.T) {
	// A delivered host lives at <libexec>/versions/<version>/<binary>.
	dir := t.TempDir()
	versioned := filepath.Join(dir, "versions", "637f65559d16")
	if err := os.MkdirAll(versioned, 0o755); err != nil {
		t.Fatal(err)
	}
	self := filepath.Join(versioned, "nox-mesh-host")
	if err := os.WriteFile(self, []byte("#!/bin/sh\n"), 0o755); err != nil {
		t.Fatal(err)
	}
	if got := versionAt(self, "development build"); got != "637f65559d16" {
		t.Fatalf("a delivered host read its version as %q", got)
	}
}

func TestAHostPlacedByHandKeepsItsStamp(t *testing.T) {
	// The honest answer for one the mesh did not deliver — and every machine is in that state until
	// a delivery reaches it.
	if got := versionAt("/usr/bin/nox-mesh-host", "04a27ca"); got != "04a27ca" {
		t.Fatalf("a hand-placed host read its version as %q", got)
	}
}

func TestADirectoryThatIsNotAVersionIsNotReadAsOne(t *testing.T) {
	// A binary sitting anywhere else must not have its parent directory's name read as a version.
	for _, path := range []string{
		"/opt/somewhere/nox-mesh-host",
		"/usr/lib/nox-mesh-host/launch",
		"/home/someone/build/nox-mesh-host",
	} {
		if got := versionAt(path, "the stamp"); got != "the stamp" {
			t.Fatalf("%s read its version as %q", path, got)
		}
	}
}