package v1

import (
	"strconv"
	"sync"
	"testing"

	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
	"github.com/prysmaticlabs/prysm/config/params"
	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
	"github.com/prysmaticlabs/prysm/shared/testutil/assert"
)

func TestValidatorMap_DistinctCopy(t *testing.T) {
	count := uint64(100)
	vals := make([]*ethpb.Validator, 0, count)
	for i := uint64(1); i < count; i++ {
		someRoot := [32]byte{}
		someKey := [48]byte{}
		copy(someRoot[:], strconv.Itoa(int(i)))
		copy(someKey[:], strconv.Itoa(int(i)))
		vals = append(vals, &ethpb.Validator{
			PublicKey:                  someKey[:],
			WithdrawalCredentials:      someRoot[:],
			EffectiveBalance:           params.BeaconConfig().MaxEffectiveBalance,
			Slashed:                    false,
			ActivationEligibilityEpoch: 1,
			ActivationEpoch:            1,
			ExitEpoch:                  1,
			WithdrawableEpoch:          1,
		})
	}
	handler := stateutil.NewValMapHandler(vals)
	newHandler := handler.Copy()
	wantedPubkey := strconv.Itoa(22)
	handler.Set(bytesutil.ToBytes48([]byte(wantedPubkey)), 27)
	val1, _ := handler.Get(bytesutil.ToBytes48([]byte(wantedPubkey)))
	val2, _ := newHandler.Get(bytesutil.ToBytes48([]byte(wantedPubkey)))
	assert.NotEqual(t, val1, val2, "Values are supposed to be unequal due to copy")
}

func TestBeaconState_NoDeadlock(t *testing.T) {
	count := uint64(100)
	vals := make([]*ethpb.Validator, 0, count)
	for i := uint64(1); i < count; i++ {
		someRoot := [32]byte{}
		someKey := [48]byte{}
		copy(someRoot[:], strconv.Itoa(int(i)))
		copy(someKey[:], strconv.Itoa(int(i)))
		vals = append(vals, &ethpb.Validator{
			PublicKey:                  someKey[:],
			WithdrawalCredentials:      someRoot[:],
			EffectiveBalance:           params.BeaconConfig().MaxEffectiveBalance,
			Slashed:                    false,
			ActivationEligibilityEpoch: 1,
			ActivationEpoch:            1,
			ExitEpoch:                  1,
			WithdrawableEpoch:          1,
		})
	}
	st, err := InitializeFromProtoUnsafe(&ethpb.BeaconState{
		Validators: vals,
	})
	assert.NoError(t, err)

	wg := new(sync.WaitGroup)

	wg.Add(1)
	go func() {
		// Continuously lock and unlock the state
		// by acquiring the lock.
		for i := 0; i < 1000; i++ {
			for _, f := range st.stateFieldLeaves {
				f.Lock()
				if f.Empty() {
					f.InsertFieldLayer(make([][]*[32]byte, 10))
				}
				f.Unlock()
				f.FieldReference().AddRef()
			}
		}
		wg.Done()
	}()
	// Constantly read from the offending portion
	// of the code to ensure there is no possible
	// recursive read locking.
	for i := 0; i < 1000; i++ {
		go func() {
			_ = st.FieldReferencesCount()
		}()
	}
	// Test will not terminate in the event of a deadlock.
	wg.Wait()
}

func TestStateTrie_IsNil(t *testing.T) {
	var emptyState *BeaconState
	assert.Equal(t, true, emptyState.IsNil())

	emptyProto := &BeaconState{state: nil}
	assert.Equal(t, true, emptyProto.IsNil())

	nonNilState := &BeaconState{state: &ethpb.BeaconState{}}
	assert.Equal(t, false, nonNilState.IsNil())
}