package meshtest

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

// bundlesWhy returns the reason bundles cannot be launched from a checkout rooted at root, or "" when they can: the
// TypeScript and Python bundles the runtime and the console launch need node and the package
// @novox/mesh-sdk, which comes from the package registry and is installed beside node-tools/package.json
// (novox/hq ADR 0529 clause 1: what merge-check.sh said "NOT TESTED HERE" about is a skip with its reason).
func bundlesWhy(root string, haveNode bool) string {
	if !haveNode {
		return "node is not installed"
	}
	if _, err := os.Stat(filepath.Join(root, "node_modules", "@novox", "mesh-sdk")); err != nil {
		return "@novox/mesh-sdk is not installed in " + filepath.Join(root, "node_modules")
	}
	return ""
}

// NeedBundles skips the test, saying why, where the bundles it launches cannot run here.
func NeedBundles(t *testing.T) {
	t.Helper()
	_, err := exec.LookPath("node")
	if why := bundlesWhy(moduleRoot(), err == nil); why != "" {
		t.Skip("NOT TESTED HERE: this test launches bundles, and " + why)
	}
}

// moduleRoot is node-tools/, where package.json and node_modules are.
func moduleRoot() string {
	_, here, _, _ := runtime.Caller(0)
	return filepath.Join(filepath.Dir(here), "..", "..")
}