package s3tables

import (
	"context"
	"encoding/json"
	"errors"
	"testing"

	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
	"github.com/seaweedfs/seaweedfs/weed/s3api/s3tables/s3tablestest"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

// deleteEntryStub answers DeleteEntry the way the filer does: a rejected delete
// comes back as a nil transport error with the reason in the response.
type deleteEntryStub struct {
	filer_pb.SeaweedFilerClient
	resp *filer_pb.DeleteEntryResponse
	err  error
	req  *filer_pb.DeleteEntryRequest
}

func (s *deleteEntryStub) DeleteEntry(_ context.Context, req *filer_pb.DeleteEntryRequest, _ ...grpc.CallOption) (*filer_pb.DeleteEntryResponse, error) {
	s.req = req
	return s.resp, s.err
}

func TestDeleteDirectoryReportsRejectedDelete(t *testing.T) {
	stub := &deleteEntryStub{resp: &filer_pb.DeleteEntryResponse{Error: "fail to delete non-empty folder"}}

	err := (&S3TablesHandler{}).deleteDirectory(context.Background(), stub, "/buckets/b/ns/t")

	require.Error(t, err, "a delete the filer rejected must not be reported as success")
	assert.Contains(t, err.Error(), "fail to delete non-empty folder")
}

func TestDeleteDirectoryToleratesMissingEntry(t *testing.T) {
	t.Run("reported in the response", func(t *testing.T) {
		stub := &deleteEntryStub{resp: &filer_pb.DeleteEntryResponse{Error: filer_pb.ErrNotFound.Error()}}
		assert.NoError(t, (&S3TablesHandler{}).deleteDirectory(context.Background(), stub, "/buckets/b/ns/t"))
	})
	t.Run("reported as a transport error", func(t *testing.T) {
		stub := &deleteEntryStub{err: status.Error(codes.NotFound, filer_pb.ErrNotFound.Error())}
		assert.NoError(t, (&S3TablesHandler{}).deleteDirectory(context.Background(), stub, "/buckets/b/ns/t"))
	})
}

func TestDeleteDirectoryPropagatesTransportError(t *testing.T) {
	stub := &deleteEntryStub{err: errors.New("filer unreachable")}

	err := (&S3TablesHandler{}).deleteDirectory(context.Background(), stub, "/buckets/b/ns/t")

	require.Error(t, err)
	assert.Contains(t, err.Error(), "filer unreachable")
}

// deleteDirectory drops a whole subtree, so the delete has to stay recursive and
// take the data with it.
func TestDeleteDirectoryDeletesTheSubtree(t *testing.T) {
	stub := &deleteEntryStub{resp: &filer_pb.DeleteEntryResponse{}}

	require.NoError(t, (&S3TablesHandler{}).deleteDirectory(context.Background(), stub, "/buckets/b/ns/t"))

	require.NotNil(t, stub.req)
	assert.Equal(t, "/buckets/b/ns", stub.req.Directory)
	assert.Equal(t, "t", stub.req.Name)
	assert.True(t, stub.req.IsDeleteData)
	assert.True(t, stub.req.IsRecursive)
	assert.True(t, stub.req.IgnoreRecursiveError)
}

// The bucket is the directory, so DeleteTableBucket must not answer success
// when the filer refused to remove it.
func TestDeleteTableBucketReportsRejectedDirectoryDelete(t *testing.T) {
	fs := s3tablestest.Start(t)
	bucketMeta, err := json.Marshal(tableBucketMetadata{Name: renameTestBucket, OwnerAccountID: DefaultAccountID})
	require.NoError(t, err)
	fs.Put(TablesPath, renameTestBucket, map[string][]byte{
		ExtendedKeyTableBucket: []byte("{}"),
		ExtendedKeyMetadata:    bucketMeta,
	})

	bucketPath := GetTableBucketPath(renameTestBucket)
	fs.RejectDelete = func(dir, name string) string {
		if dir+"/"+name == bucketPath {
			return "fail to delete non-empty folder"
		}
		return ""
	}

	m := NewManager()
	m.SetTrusted(true)
	err = m.Execute(context.Background(), NewManagerClient(fs.Client), "DeleteTableBucket",
		&DeleteTableBucketRequest{TableBucketARN: mustBucketARN(t)}, nil, "")

	require.Error(t, err, "a bucket the filer refused to delete must not be reported as deleted")
	assert.NotNil(t, fs.Get(TablesPath, renameTestBucket), "the bucket is still there")
}