package meta_test

import (
	"context"
	"math/rand"
	"strconv"
	"testing"

	object2 "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
	objectV2 "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/object"
	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
	"github.com/stretchr/testify/require"
	"golang.org/x/exp/maps"
)

func TestDB_IterateExpired(t *testing.T) {
	db := newDB(t)
	defer func() { require.NoError(t, db.Close(context.Background())) }()

	const epoch = 13
	const lockExpiresAfter = 1000

	mAlive := map[objectSDK.Type]oid.Address{}
	mExpired := map[objectSDK.Type]oid.Address{}

	for _, typ := range []objectSDK.Type{
		objectSDK.TypeRegular,
		objectSDK.TypeTombstone,
		objectSDK.TypeLock,
	} {
		mAlive[typ] = putWithExpiration(t, db, typ, epoch)
		mExpired[typ] = putWithExpiration(t, db, typ, epoch-1)
	}

	expiredLocked := putWithExpiration(t, db, objectSDK.TypeRegular, epoch-1)

	require.NoError(t, db.Lock(context.Background(), expiredLocked.Container(), oidtest.ID(), []oid.ID{expiredLocked.Object()}, lockExpiresAfter))

	err := db.IterateExpired(context.Background(), epoch, func(exp *meta.ExpiredObject) error {
		if addr, ok := mAlive[exp.Type()]; ok {
			require.NotEqual(t, addr, exp.Address())
		}

		require.NotEqual(t, expiredLocked, exp.Address())

		addr, ok := mExpired[exp.Type()]
		require.True(t, ok)
		require.Equal(t, addr, exp.Address())

		delete(mExpired, exp.Type())

		return nil
	})
	require.NoError(t, err)

	require.Empty(t, mExpired)
}

func putWithExpiration(t *testing.T, db *meta.DB, typ objectSDK.Type, expiresAt uint64) oid.Address {
	obj := testutil.GenerateObject()
	obj.SetType(typ)
	testutil.AddAttribute(obj, objectV2.SysAttributeExpEpoch, strconv.FormatUint(expiresAt, 10))

	require.NoError(t, putBig(db, obj))

	return object2.AddressOf(obj)
}

func TestIterateLocked(t *testing.T) {
	t.Parallel()

	const (
		numObjects        = 10
		numLocksPerObject = 10
	)

	db := newDB(t)
	defer func() { require.NoError(t, db.Close(context.Background())) }()

	m := make(map[oid.Address][]meta.Lock)

	// every two objects have same container
	for range numObjects / 2 {
		container := cidtest.ID()

		object := testutil.GenerateObjectWithCID(container)
		require.NoError(t, metaPut(db, object, nil))
		addr := object2.AddressOf(object)
		m[addr] = []meta.Lock{}

		object = testutil.GenerateObjectWithCID(container)
		require.NoError(t, metaPut(db, object, nil))
		addr = object2.AddressOf(object)
		m[addr] = []meta.Lock{}
	}

	for addr := range m {
		// every object has locks of both old and new formats
		for range numLocksPerObject / 2 {
			m[addr] = append(m[addr],
				meta.Lock{
					ID:       oidtest.ID(),
					ExpEpoch: rand.Uint64(),
				}, meta.Lock{
					ID:       oidtest.ID(),
					ExpEpoch: meta.NoExpirationEpoch,
				},
			)
		}

		for _, lock := range m[addr] {
			require.NoError(t, db.Lock(
				context.Background(),
				addr.Container(),
				lock.ID,
				[]oid.ID{addr.Object()},
				lock.ExpEpoch,
			))
		}
	}

	t.Run("just iterate", func(t *testing.T) {
		err := db.IterateLocked(context.Background(), nil, func(lo *meta.LockedObject) error {
			locks, ok := m[lo.Address()]
			require.True(t, ok)
			require.ElementsMatch(t, locks, lo.Locks())
			return nil
		})
		require.NoError(t, err)
	})

	t.Run("iterate with offset", func(t *testing.T) {
		var foundObjects []oid.Address
		var offset *oid.Address

		for didStep := true; didStep; {
			didStep = false
			err := db.IterateLocked(context.Background(), offset, func(lo *meta.LockedObject) error {
				addr := lo.Address()
				foundObjects = append(foundObjects, addr)
				offset = &addr
				didStep = true
				return meta.ErrInterruptIterator
			})
			require.NoError(t, err)
		}
		require.ElementsMatch(t, foundObjects, maps.Keys(m))
	})
}