package rpc

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"testing"

	"github.com/golang/protobuf/ptypes/empty"
	"github.com/google/uuid"
	pb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/validator-client"
	"github.com/prysmaticlabs/prysm/shared/bls"
	"github.com/prysmaticlabs/prysm/shared/event"
	"github.com/prysmaticlabs/prysm/shared/featureconfig"
	"github.com/prysmaticlabs/prysm/shared/fileutil"
	"github.com/prysmaticlabs/prysm/shared/testutil/assert"
	"github.com/prysmaticlabs/prysm/shared/testutil/require"
	"github.com/prysmaticlabs/prysm/validator/accounts"
	"github.com/prysmaticlabs/prysm/validator/accounts/iface"
	"github.com/prysmaticlabs/prysm/validator/accounts/wallet"
	"github.com/prysmaticlabs/prysm/validator/keymanager"
	"github.com/prysmaticlabs/prysm/validator/keymanager/imported"
	keystorev4 "github.com/wealdtech/go-eth2-wallet-encryptor-keystorev4"
)

const strongPass = "29384283xasjasd32%%&*@*#*"

func TestServer_CreateWallet_Imported(t *testing.T) {
	localWalletDir := setupWalletDir(t)
	defaultWalletPath = localWalletDir
	ctx := context.Background()
	s := &Server{
		walletInitializedFeed: new(event.Feed),
		walletDir:             defaultWalletPath,
	}
	_, err := s.Signup(ctx, &pb.AuthRequest{
		Password:             strongPass,
		PasswordConfirmation: strongPass,
	})
	require.NoError(t, err)
	req := &pb.CreateWalletRequest{
		Keymanager:     pb.KeymanagerKind_IMPORTED,
		WalletPassword: strongPass,
	}
	// We delete the directory at defaultWalletPath as CreateWallet will return an error if it tries to create a wallet
	// where a directory already exists
	require.NoError(t, os.RemoveAll(defaultWalletPath))
	_, err = s.CreateWallet(ctx, req)
	require.NoError(t, err)

	importReq := &pb.ImportKeystoresRequest{
		KeystoresPassword: strongPass,
		KeystoresImported: []string{"badjson"},
	}
	_, err = s.ImportKeystores(ctx, importReq)
	require.ErrorContains(t, "Not a valid EIP-2335 keystore", err)

	encryptor := keystorev4.New()
	keystores := make([]string, 3)
	for i := 0; i < len(keystores); i++ {
		privKey, err := bls.RandKey()
		require.NoError(t, err)
		pubKey := fmt.Sprintf("%x", privKey.PublicKey().Marshal())
		id, err := uuid.NewRandom()
		require.NoError(t, err)
		cryptoFields, err := encryptor.Encrypt(privKey.Marshal(), strongPass)
		require.NoError(t, err)
		item := &keymanager.Keystore{
			Crypto:  cryptoFields,
			ID:      id.String(),
			Version: encryptor.Version(),
			Pubkey:  pubKey,
			Name:    encryptor.Name(),
		}
		encodedFile, err := json.MarshalIndent(item, "", "\t")
		require.NoError(t, err)
		keystores[i] = string(encodedFile)
	}
	importReq.KeystoresImported = keystores
	_, err = s.ImportKeystores(ctx, importReq)
	require.NoError(t, err)
}

func TestServer_RecoverWallet_Derived(t *testing.T) {
	localWalletDir := setupWalletDir(t)
	ctx := context.Background()
	s := &Server{
		walletInitializedFeed: new(event.Feed),
		walletDir:             localWalletDir,
	}
	req := &pb.RecoverWalletRequest{
		WalletPassword: strongPass,
		NumAccounts:    0,
	}
	// We delete the directory at defaultWalletPath as RecoverWallet will return an error if it tries to create a wallet
	// where a directory already exists
	require.NoError(t, os.RemoveAll(localWalletDir))
	_, err := s.RecoverWallet(ctx, req)
	require.ErrorContains(t, "Must create at least 1 validator account", err)

	req.NumAccounts = 2
	req.Language = "Swahili"
	_, err = s.RecoverWallet(ctx, req)
	require.ErrorContains(t, "input not in the list of supported languages", err)

	req.Language = "ENglish"
	_, err = s.RecoverWallet(ctx, req)
	require.ErrorContains(t, "invalid mnemonic in request", err)

	mnemonicResp, err := s.GenerateMnemonic(ctx, &empty.Empty{})
	require.NoError(t, err)
	req.Mnemonic = mnemonicResp.Mnemonic

	req.Mnemonic25ThWord = " "
	_, err = s.RecoverWallet(ctx, req)
	require.ErrorContains(t, "mnemonic 25th word cannot be empty", err)
	req.Mnemonic25ThWord = "outer"

	// Test weak password.
	req.WalletPassword = "123qwe"
	_, err = s.RecoverWallet(ctx, req)
	require.ErrorContains(t, "password did not pass validation", err)

	req.WalletPassword = strongPass
	// Create(derived) should fail then test recover.
	reqCreate := &pb.CreateWalletRequest{
		Keymanager:     pb.KeymanagerKind_DERIVED,
		WalletPassword: strongPass,
		NumAccounts:    2,
		Mnemonic:       mnemonicResp.Mnemonic,
	}
	_, err = s.CreateWallet(ctx, reqCreate)
	require.ErrorContains(t, "create wallet not supported through web", err, "Create wallet for DERIVED or REMOTE types not supported through web, either import keystore or recover")

	// This defer will be the last to execute in this func.
	resetCfgFalse := featureconfig.InitWithReset(&featureconfig.Flags{
		WriteWalletPasswordOnWebOnboarding: false,
	})
	defer resetCfgFalse()

	resetCfgTrue := featureconfig.InitWithReset(&featureconfig.Flags{
		WriteWalletPasswordOnWebOnboarding: true,
	})
	defer resetCfgTrue()

	// Finally test recover.
	_, err = s.RecoverWallet(ctx, req)
	require.NoError(t, err)

	// Password File should have been written.
	passwordFilePath := filepath.Join(localWalletDir, wallet.DefaultWalletPasswordFile)
	assert.Equal(t, true, fileutil.FileExists(passwordFilePath))

	// Attempting to write again should trigger an error.
	err = writeWalletPasswordToDisk(localWalletDir, "somepassword")
	require.ErrorContains(t, "cannot write wallet password file as it already exists", err)

}

func TestServer_WalletConfig_NoWalletFound(t *testing.T) {
	s := &Server{}
	resp, err := s.WalletConfig(context.Background(), &empty.Empty{})
	require.NoError(t, err)
	assert.DeepEqual(t, resp, &pb.WalletResponse{})
}

func TestServer_WalletConfig(t *testing.T) {
	localWalletDir := setupWalletDir(t)
	defaultWalletPath = localWalletDir
	ctx := context.Background()
	s := &Server{
		walletInitializedFeed: new(event.Feed),
		walletDir:             defaultWalletPath,
	}
	// We attempt to create the wallet.
	w, err := accounts.CreateWalletWithKeymanager(ctx, &accounts.CreateWalletConfig{
		WalletCfg: &wallet.Config{
			WalletDir:      defaultWalletPath,
			KeymanagerKind: keymanager.Imported,
			WalletPassword: strongPass,
		},
		SkipMnemonicConfirm: true,
	})
	require.NoError(t, err)
	km, err := w.InitializeKeymanager(ctx, iface.InitKeymanagerConfig{ListenForChanges: false})
	require.NoError(t, err)
	s.wallet = w
	s.keymanager = km
	resp, err := s.WalletConfig(ctx, &empty.Empty{})
	require.NoError(t, err)

	assert.DeepEqual(t, resp, &pb.WalletResponse{
		WalletPath:     localWalletDir,
		KeymanagerKind: pb.KeymanagerKind_IMPORTED,
	})
}

func TestServer_ImportKeystores_FailedPreconditions_WrongKeymanagerKind(t *testing.T) {
	localWalletDir := setupWalletDir(t)
	defaultWalletPath = localWalletDir
	ctx := context.Background()
	w, err := accounts.CreateWalletWithKeymanager(ctx, &accounts.CreateWalletConfig{
		WalletCfg: &wallet.Config{
			WalletDir:      defaultWalletPath,
			KeymanagerKind: keymanager.Derived,
			WalletPassword: strongPass,
		},
		SkipMnemonicConfirm: true,
	})
	require.NoError(t, err)
	km, err := w.InitializeKeymanager(ctx, iface.InitKeymanagerConfig{ListenForChanges: false})
	require.NoError(t, err)
	ss := &Server{
		wallet:     w,
		keymanager: km,
	}
	_, err = ss.ImportKeystores(ctx, &pb.ImportKeystoresRequest{})
	assert.ErrorContains(t, "Only imported wallets can import more", err)
}

func TestServer_ImportKeystores_FailedPreconditions(t *testing.T) {
	localWalletDir := setupWalletDir(t)
	defaultWalletPath = localWalletDir
	ctx := context.Background()
	w, err := accounts.CreateWalletWithKeymanager(ctx, &accounts.CreateWalletConfig{
		WalletCfg: &wallet.Config{
			WalletDir:      defaultWalletPath,
			KeymanagerKind: keymanager.Imported,
			WalletPassword: strongPass,
		},
		SkipMnemonicConfirm: true,
	})
	require.NoError(t, err)
	km, err := w.InitializeKeymanager(ctx, iface.InitKeymanagerConfig{ListenForChanges: false})
	require.NoError(t, err)
	ss := &Server{
		keymanager: km,
	}
	_, err = ss.ImportKeystores(ctx, &pb.ImportKeystoresRequest{})
	assert.ErrorContains(t, "No wallet initialized", err)
	ss.wallet = w
	_, err = ss.ImportKeystores(ctx, &pb.ImportKeystoresRequest{})
	assert.ErrorContains(t, "Password required for keystores", err)
	_, err = ss.ImportKeystores(ctx, &pb.ImportKeystoresRequest{
		KeystoresPassword: strongPass,
	})
	assert.ErrorContains(t, "No keystores included for import", err)
	_, err = ss.ImportKeystores(ctx, &pb.ImportKeystoresRequest{
		KeystoresPassword: strongPass,
		KeystoresImported: []string{"badjson"},
	})
	assert.ErrorContains(t, "Not a valid EIP-2335 keystore", err)
}

func TestServer_ImportKeystores_OK(t *testing.T) {
	imported.ResetCaches()
	localWalletDir := setupWalletDir(t)
	defaultWalletPath = localWalletDir
	ctx := context.Background()
	w, err := accounts.CreateWalletWithKeymanager(ctx, &accounts.CreateWalletConfig{
		WalletCfg: &wallet.Config{
			WalletDir:      defaultWalletPath,
			KeymanagerKind: keymanager.Imported,
			WalletPassword: strongPass,
		},
		SkipMnemonicConfirm: true,
	})
	require.NoError(t, err)
	km, err := w.InitializeKeymanager(ctx, iface.InitKeymanagerConfig{ListenForChanges: false})
	require.NoError(t, err)
	ss := &Server{
		keymanager:            km,
		wallet:                w,
		walletInitializedFeed: new(event.Feed),
	}

	// Create 3 keystores.
	encryptor := keystorev4.New()
	keystores := make([]string, 3)
	pubKeys := make([][]byte, 3)
	for i := 0; i < len(keystores); i++ {
		privKey, err := bls.RandKey()
		require.NoError(t, err)
		pubKey := fmt.Sprintf("%x", privKey.PublicKey().Marshal())
		id, err := uuid.NewRandom()
		require.NoError(t, err)
		cryptoFields, err := encryptor.Encrypt(privKey.Marshal(), strongPass)
		require.NoError(t, err)
		item := &keymanager.Keystore{
			Crypto:  cryptoFields,
			ID:      id.String(),
			Version: encryptor.Version(),
			Pubkey:  pubKey,
			Name:    encryptor.Name(),
		}
		encodedFile, err := json.MarshalIndent(item, "", "\t")
		require.NoError(t, err)
		keystores[i] = string(encodedFile)
		pubKeys[i] = privKey.PublicKey().Marshal()
	}

	// Check the wallet has no accounts to start with.
	keys, err := km.FetchValidatingPublicKeys(ctx)
	require.NoError(t, err)
	assert.Equal(t, 0, len(keys))

	// Import the 3 keystores and verify the wallet has 3 new accounts.
	res, err := ss.ImportKeystores(ctx, &pb.ImportKeystoresRequest{
		KeystoresPassword: strongPass,
		KeystoresImported: keystores,
	})
	require.NoError(t, err)
	assert.DeepEqual(t, &pb.ImportKeystoresResponse{
		ImportedPublicKeys: pubKeys,
	}, res)

	km, err = w.InitializeKeymanager(ctx, iface.InitKeymanagerConfig{ListenForChanges: false})
	require.NoError(t, err)
	keys, err = km.FetchValidatingPublicKeys(ctx)
	require.NoError(t, err)
	assert.Equal(t, 3, len(keys))
}

func Test_writeWalletPasswordToDisk(t *testing.T) {
	walletDir := setupWalletDir(t)
	resetCfg := featureconfig.InitWithReset(&featureconfig.Flags{
		WriteWalletPasswordOnWebOnboarding: false,
	})
	defer resetCfg()
	err := writeWalletPasswordToDisk(walletDir, "somepassword")
	require.NoError(t, err)

	// Expected a silent failure if the feature flag is not enabled.
	passwordFilePath := filepath.Join(walletDir, wallet.DefaultWalletPasswordFile)
	assert.Equal(t, false, fileutil.FileExists(passwordFilePath))
	resetCfg = featureconfig.InitWithReset(&featureconfig.Flags{
		WriteWalletPasswordOnWebOnboarding: true,
	})
	defer resetCfg()
	err = writeWalletPasswordToDisk(walletDir, "somepassword")
	require.NoError(t, err)

	// File should have been written.
	assert.Equal(t, true, fileutil.FileExists(passwordFilePath))

	// Attempting to write again should trigger an error.
	err = writeWalletPasswordToDisk(walletDir, "somepassword")
	require.NotNil(t, err)
}

func createImportedWalletWithAccounts(t testing.TB, numAccounts int) (*Server, [][]byte) {
	localWalletDir := setupWalletDir(t)
	defaultWalletPath = localWalletDir
	ctx := context.Background()
	w, err := accounts.CreateWalletWithKeymanager(ctx, &accounts.CreateWalletConfig{
		WalletCfg: &wallet.Config{
			WalletDir:      defaultWalletPath,
			KeymanagerKind: keymanager.Imported,
			WalletPassword: strongPass,
		},
		SkipMnemonicConfirm: true,
	})
	require.NoError(t, err)

	km, err := w.InitializeKeymanager(ctx, iface.InitKeymanagerConfig{ListenForChanges: false})
	require.NoError(t, err)
	s := &Server{
		keymanager:            km,
		wallet:                w,
		walletDir:             defaultWalletPath,
		walletInitializedFeed: new(event.Feed),
	}
	// First we import accounts into the wallet.
	encryptor := keystorev4.New()
	keystores := make([]string, numAccounts)
	pubKeys := make([][]byte, len(keystores))
	for i := 0; i < len(keystores); i++ {
		privKey, err := bls.RandKey()
		require.NoError(t, err)
		pubKey := fmt.Sprintf("%x", privKey.PublicKey().Marshal())
		id, err := uuid.NewRandom()
		require.NoError(t, err)
		cryptoFields, err := encryptor.Encrypt(privKey.Marshal(), strongPass)
		require.NoError(t, err)
		item := &keymanager.Keystore{
			Crypto:  cryptoFields,
			ID:      id.String(),
			Version: encryptor.Version(),
			Pubkey:  pubKey,
			Name:    encryptor.Name(),
		}
		encodedFile, err := json.MarshalIndent(item, "", "\t")
		require.NoError(t, err)
		keystores[i] = string(encodedFile)
		pubKeys[i] = privKey.PublicKey().Marshal()
	}
	_, err = s.ImportKeystores(ctx, &pb.ImportKeystoresRequest{
		KeystoresImported: keystores,
		KeystoresPassword: strongPass,
	})
	require.NoError(t, err)
	s.keymanager, err = s.wallet.InitializeKeymanager(ctx, iface.InitKeymanagerConfig{ListenForChanges: false})
	require.NoError(t, err)
	return s, pubKeys
}