package packaging_test

import (
	"encoding/json"
	"os"
	"testing"
)

// The mesh delivers the launcher, so the manifest carries a copy of it (novox/hq 04-ISSUES/142).
//
// **Two copies of one script is a drift waiting to happen**, and the only reason to accept it is that
// a file resource is written atomically — temp file, then rename — while an archive writes in place
// with truncate. The running launcher keeps the inode it was started from and the next start picks up
// the new one; unpacking an archive over it would truncate the file a running shell is reading.
//
// So: two copies, and this is the check that they are the same one.
func TestTheManifestCarriesTheLauncherExactly(t *testing.T) {
	onDisk, err := os.ReadFile("nox-mesh-host-launch")
	if err != nil {
		t.Fatal(err)
	}
	raw, err := os.ReadFile("../module.json")
	if err != nil {
		t.Fatal(err)
	}
	var manifest struct {
		Resources []struct {
			ID      string `json:"id"`
			Content string `json:"content"`
		} `json:"resources"`
	}
	if err := json.Unmarshal(raw, &manifest); err != nil {
		t.Fatal(err)
	}
	for _, r := range manifest.Resources {
		if r.ID != "launcher" {
			continue
		}
		if r.Content != string(onDisk) {
			t.Fatal("the launcher the mesh would deliver is not the launcher in this repository. " +
				"Copy packaging/nox-mesh-host-launch into module.json's `launcher` resource — the " +
				"machines run what the manifest says, and this file is what gets reviewed")
		}
		return
	}
	t.Fatal("module.json declares no `launcher` resource, so nothing delivers the launcher and a " +
		"delivered host version is never started")
}