package bundle

import (
	"context"
	"reflect"
	"testing"

	"gitea.maximumdirect.net/eric/distributor/internal/storage"
	"gitea.maximumdirect.net/eric/distributor/internal/storage/fake"
)

func TestDiscoverFindsBundlesInDeterministicOrder(t *testing.T) {
	backend := fake.New()
	addBundle(t, backend, "z/daily")
	addBundle(t, backend, "a/daily")

	bundles, err := Discover(context.Background(), backend, "")
	if err != nil {
		t.Fatalf("Discover() error = %v", err)
	}
	var paths []string
	for _, sourceBundle := range bundles {
		paths = append(paths, sourceBundle.RootRelativePath)
	}
	want := []string{"a/daily", "z/daily"}
	if !reflect.DeepEqual(paths, want) {
		t.Fatalf("paths = %v, want %v", paths, want)
	}
}

func TestDiscoverFindsRootBundle(t *testing.T) {
	backend := validFakeBundle(t)
	bundles, err := Discover(context.Background(), backend, "")
	if err != nil {
		t.Fatalf("Discover() error = %v", err)
	}
	if got, want := len(bundles), 1; got != want {
		t.Fatalf("bundle count = %d, want %d", got, want)
	}
	if bundles[0].RootRelativePath != "" {
		t.Fatalf("root = %q, want empty", bundles[0].RootRelativePath)
	}
}

func TestDiscoverRejectsNestedManifests(t *testing.T) {
	backend := fake.New()
	addBundle(t, backend, "daily")
	addBundle(t, backend, "daily/nested")

	_, err := Discover(context.Background(), backend, "")
	assertErrorContains(t, err, "nested manifest")
}

func addBundle(t *testing.T, backend *fake.Backend, root string) {
	t.Helper()
	writeFakeFile(t, backend, joinTestPath(root, "manifest.json"), string(readFixture(t, "testdata/valid_bundle/manifest.json")))
	writeFakeFile(t, backend, joinTestPath(root, "report.md"), string(readFixture(t, "testdata/valid_bundle/report.md")))
	writeFakeFile(t, backend, joinTestPath(root, "summary.txt"), string(readFixture(t, "testdata/valid_bundle/summary.txt")))
}

func joinTestPath(root, file string) string {
	if root == "" {
		return file
	}
	joined, err := storage.Join(root, file)
	if err != nil {
		panic(err)
	}
	return joined
}