package appbackup

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

// R-49 (D21 = B): the template's `backup.volumes` list — only `excluded`, only declared named volumes, never all of them.
func TestR49_ExcludedDockerVolumes(t *testing.T) {
	dir := filepath.Join(t.TempDir(), "immich")
	os.MkdirAll(dir, 0o755)
	compose := filepath.Join(dir, "docker-compose.yml")
	os.WriteFile(compose, []byte("services:\n  a:\n    image: x\n    volumes:\n      - immich_ml_cache:/cache\n      - immich_postgres_data:/db\nvolumes:\n  immich_ml_cache:\n  immich_postgres_data:\n"), 0o644)
	spec := &BackupSpec{Volumes: []VolumeSpec{
		{Name: "immich_ml_cache", Class: ClassExcluded},
		{Name: "no_such_volume", Class: ClassExcluded},
		{Name: "immich_postgres_data", Class: ClassMandatory},
	}}
	ex, ignored := ExcludedDockerVolumes(spec, compose)
	if !reflect.DeepEqual(ex, []string{"immich_immich_ml_cache"}) {
		t.Fatalf("excluded = %v, want [immich_immich_ml_cache] (project-prefixed like ResolveDockerVolumeNames)", ex)
	}
	if len(ignored) != 2 {
		t.Fatalf("ignored = %v, want the unknown name and the non-excluded class", ignored)
	}
	all := &BackupSpec{Volumes: []VolumeSpec{{Name: "immich_ml_cache", Class: ClassExcluded}, {Name: "immich_postgres_data", Class: ClassExcluded}}}
	if ex, ig := ExcludedDockerVolumes(all, compose); ex != nil || len(ig) == 0 {
		t.Fatalf("excluding EVERY named volume must be refused (a hollow unit), got %v / %v", ex, ig)
	}
	if ex, _ := ExcludedDockerVolumes(nil, compose); ex != nil {
		t.Fatal("no backup block → nothing excluded")
	}
}

// The new key never costs an app its bind classifications: a block whose only fault is a bad volume entry still
// validates (ValidateBackupSpec does not read Volumes).
func TestR49_AVolumeEntryNeverInvalidatesTheBlock(t *testing.T) {
	spec := &BackupSpec{HDD: []BindSpec{{Path: "appdata/immich", Class: ClassMandatory}},
		Volumes: []VolumeSpec{{Name: "nonsense", Class: "bogus"}}}
	binds := []ComposeBind{{Root: RootHDD, RelPath: "appdata/immich"}}
	if err := ValidateBackupSpec(spec, binds); err != nil {
		t.Fatalf("a bad volume entry discarded the block: %v", err)
	}
}