package catalogue

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

// readManifest is one manifest of the catalogue as ReadTreeManifest read it.
type readManifest struct {
	path     string // the module.json
	manifest Manifest
	err      error
}

var (
	readOnce sync.Once
	readAll  []readManifest
	readRoot string
)

// catalogueManifests is every manifest of the catalogue (catalogueRoot), read through ReadTreeManifest once
// per test binary and not once per test: the checks over the real catalogue each read and parsed every
// manifest again, and together took 1.5 s of mesh-sdk's unit bound of 2 s (issue 1756). What it returns is
// shared and read-only: a test that changes a manifest copies it first.
func catalogueManifests(t *testing.T) (string, []readManifest) {
	t.Helper()
	root := catalogueRoot(t)
	readOnce.Do(func() {
		readRoot = root
		found, err := filepath.Glob(filepath.Join(root, "modules", "*", "module.json"))
		if err != nil {
			return
		}
		for _, p := range found {
			m, err := ReadTreeManifest(root, filepath.Dir(p))
			readAll = append(readAll, readManifest{path: p, manifest: m, err: err})
		}
	})
	if len(readAll) == 0 {
		t.Fatalf("no manifests under %s", root)
	}
	return readRoot, readAll
}