package writecachebbolt

import (
	"context"
	"os"
	"path/filepath"
	"sync/atomic"
	"testing"

	objectCore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache/writecachetest"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
	"github.com/stretchr/testify/require"
	"go.etcd.io/bbolt"
	"go.uber.org/zap/zaptest"
)

func TestFlush(t *testing.T) {
	createCacheFn := func(t *testing.T, smallSize uint64, mb *meta.DB, bs *blobstor.BlobStor, opts ...Option) writecache.Cache {
		return New(
			append([]Option{
				WithLogger(&logger.Logger{Logger: zaptest.NewLogger(t)}),
				WithPath(filepath.Join(t.TempDir(), "writecache")),
				WithSmallObjectSize(smallSize),
				WithMetabase(mb),
				WithBlobstor(bs),
			}, opts...)...)
	}

	errCountOpt := func() (Option, *atomic.Uint32) {
		cnt := &atomic.Uint32{}
		return WithReportErrorFunc(func(string, error) {
			cnt.Add(1)
		}), cnt
	}

	failures := []writecachetest.TestFailureInjector[Option]{
		{
			Desc: "db, invalid address",
			InjectFn: func(t *testing.T, wc writecache.Cache) {
				c := wc.(*cache)
				obj := testutil.GenerateObject()
				data, err := obj.Marshal()
				require.NoError(t, err)
				require.NoError(t, c.db.Batch(func(tx *bbolt.Tx) error {
					b := tx.Bucket(defaultBucket)
					return b.Put([]byte{1, 2, 3}, data)
				}))
			},
		},
		{
			Desc: "db, invalid object",
			InjectFn: func(t *testing.T, wc writecache.Cache) {
				c := wc.(*cache)
				require.NoError(t, c.db.Batch(func(tx *bbolt.Tx) error {
					b := tx.Bucket(defaultBucket)
					k := []byte(oidtest.Address().EncodeToString())
					v := []byte{1, 2, 3}
					return b.Put(k, v)
				}))
			},
		},
		{
			Desc: "fs, read error",
			InjectFn: func(t *testing.T, wc writecache.Cache) {
				c := wc.(*cache)
				obj := testutil.GenerateObject()
				data, err := obj.Marshal()
				require.NoError(t, err)

				var prm common.PutPrm
				prm.Address = objectCore.AddressOf(obj)
				prm.RawData = data

				_, err = c.fsTree.Put(context.Background(), prm)
				require.NoError(t, err)

				p := prm.Address.Object().EncodeToString() + "." + prm.Address.Container().EncodeToString()
				p = filepath.Join(c.fsTree.RootPath, p[:1], p[1:])

				_, err = os.Stat(p) // sanity check
				require.NoError(t, err)
				require.NoError(t, os.Truncate(p, 0)) // corrupt the file contents, so that it can't be unmarshalled
			},
		},
		{
			Desc: "fs, invalid object",
			InjectFn: func(t *testing.T, wc writecache.Cache) {
				c := wc.(*cache)
				var prm common.PutPrm
				prm.Address = oidtest.Address()
				prm.RawData = []byte{1, 2, 3}
				_, err := c.fsTree.Put(context.Background(), prm)
				require.NoError(t, err)
			},
		},
	}

	writecachetest.TestFlush(t, createCacheFn, errCountOpt, failures...)
}