package wakuext

import (
	"context"
	"fmt"
	"io/ioutil"
	"math"
	"os"
	"strconv"
	"testing"
	"time"

	"go.uber.org/zap"

	"github.com/stretchr/testify/require"
	"github.com/stretchr/testify/suite"
	"github.com/syndtr/goleveldb/leveldb"
	"github.com/syndtr/goleveldb/leveldb/storage"

	"github.com/ethereum/go-ethereum/node"
	"github.com/ethereum/go-ethereum/p2p"
	"github.com/status-im/status-go/appdatabase"
	gethbridge "github.com/status-im/status-go/eth-node/bridge/geth"
	"github.com/status-im/status-go/eth-node/crypto"
	"github.com/status-im/status-go/eth-node/types"
	"github.com/status-im/status-go/multiaccounts"
	"github.com/status-im/status-go/params"
	"github.com/status-im/status-go/services/ext"
	"github.com/status-im/status-go/sqlite"
	"github.com/status-im/status-go/t/helpers"
	"github.com/status-im/status-go/waku"
)

func TestRequestMessagesErrors(t *testing.T) {
	var err error

	waku := gethbridge.NewGethWakuWrapper(waku.New(nil, nil))
	aNode, err := node.New(&node.Config{
		P2P: p2p.Config{
			MaxPeers:    math.MaxInt32,
			NoDiscovery: true,
		},
		NoUSB: true,
	}) // in-memory node as no data dir
	require.NoError(t, err)
	w := gethbridge.GetGethWakuFrom(waku)
	aNode.RegisterLifecycle(w)
	aNode.RegisterAPIs(w.APIs())
	aNode.RegisterProtocols(w.Protocols())
	require.NoError(t, err)

	err = aNode.Start()
	require.NoError(t, err)
	defer func() { require.NoError(t, aNode.Close()) }()

	handler := ext.NewHandlerMock(1)
	config := params.NodeConfig{
		ShhextConfig: params.ShhextConfig{
			InstallationID:        "1",
			BackupDisabledDataDir: os.TempDir(),
			PFSEnabled:            true,
		},
	}
	nodeWrapper := ext.NewTestNodeWrapper(nil, waku)
	service := New(config, nodeWrapper, nil, handler, nil)
	api := NewPublicAPI(service)

	const mailServerPeer = "enode://b7e65e1bedc2499ee6cbd806945af5e7df0e59e4070c96821570bd581473eade24a489f5ec95d060c0db118c879403ab88d827d3766978f28708989d35474f87@[::]:51920"

	var hash []byte

	// invalid MailServer enode address
	hash, err = api.RequestMessages(context.TODO(), ext.MessagesRequest{MailServerPeer: "invalid-address"})
	require.Nil(t, hash)
	require.EqualError(t, err, "invalid mailServerPeer value: invalid URL scheme, want \"enode\"")

	// non-existent symmetric key
	hash, err = api.RequestMessages(context.TODO(), ext.MessagesRequest{
		MailServerPeer: mailServerPeer,
		SymKeyID:       "invalid-sym-key-id",
	})
	require.Nil(t, hash)
	require.EqualError(t, err, "invalid symKeyID value: non-existent key ID")

	// with a symmetric key
	symKeyID, symKeyErr := waku.AddSymKeyFromPassword("some-pass")
	require.NoError(t, symKeyErr)
	hash, err = api.RequestMessages(context.TODO(), ext.MessagesRequest{
		MailServerPeer: mailServerPeer,
		SymKeyID:       symKeyID,
	})
	require.Nil(t, hash)
	require.Contains(t, err.Error(), "could not find peer with ID")

	// from is greater than to
	hash, err = api.RequestMessages(context.TODO(), ext.MessagesRequest{
		From: 10,
		To:   5,
	})
	require.Nil(t, hash)
	require.Contains(t, err.Error(), "Query range is invalid: from > to (10 > 5)")
}

func TestInitProtocol(t *testing.T) {
	config := params.NodeConfig{
		ShhextConfig: params.ShhextConfig{
			InstallationID:          "2",
			BackupDisabledDataDir:   t.TempDir(),
			PFSEnabled:              true,
			MailServerConfirmations: true,
			ConnectionTarget:        10,
		},
	}
	db, err := leveldb.Open(storage.NewMemStorage(), nil)
	require.NoError(t, err)

	waku := gethbridge.NewGethWakuWrapper(waku.New(nil, nil))
	privateKey, err := crypto.GenerateKey()
	require.NoError(t, err)

	nodeWrapper := ext.NewTestNodeWrapper(nil, waku)
	service := New(config, nodeWrapper, nil, nil, db)

	tmpdir := t.TempDir()

	sqlDB, err := appdatabase.InitializeDB(fmt.Sprintf("%s/db.sql", tmpdir), "password", sqlite.ReducedKDFIterationsNumber)
	require.NoError(t, err)

	tmpfile, err := ioutil.TempFile("", "multi-accounts-tests-")
	require.NoError(t, err)
	multiAccounts, err := multiaccounts.InitializeDB(tmpfile.Name())
	require.NoError(t, err)

	acc := &multiaccounts.Account{KeyUID: "0xdeadbeef"}

	err = service.InitProtocol("Test", privateKey, sqlDB, nil, multiAccounts, acc, nil, nil, zap.NewNop())
	require.NoError(t, err)
}

func TestShhExtSuite(t *testing.T) {
	suite.Run(t, new(ShhExtSuite))
}

type ShhExtSuite struct {
	suite.Suite

	dir      string
	nodes    []*node.Node
	wakus    []types.Waku
	services []*Service
}

func (s *ShhExtSuite) createAndAddNode() {
	idx := len(s.nodes)

	// create a node
	cfg := &node.Config{
		Name: strconv.Itoa(idx),
		P2P: p2p.Config{
			MaxPeers:    math.MaxInt32,
			NoDiscovery: true,
			ListenAddr:  ":0",
		},
		NoUSB: true,
	}
	stack, err := node.New(cfg)
	s.NoError(err)
	w := waku.New(nil, nil)
	stack.RegisterLifecycle(w)
	stack.RegisterAPIs(w.APIs())
	stack.RegisterProtocols(w.Protocols())
	s.NoError(err)

	// set up protocol
	config := params.NodeConfig{
		ShhextConfig: params.ShhextConfig{
			InstallationID:          "1",
			BackupDisabledDataDir:   s.dir,
			PFSEnabled:              true,
			MailServerConfirmations: true,
			ConnectionTarget:        10,
		},
	}
	db, err := leveldb.Open(storage.NewMemStorage(), nil)
	s.Require().NoError(err)
	nodeWrapper := ext.NewTestNodeWrapper(nil, gethbridge.NewGethWakuWrapper(w))
	service := New(config, nodeWrapper, nil, nil, db)
	sqlDB, err := appdatabase.InitializeDB(fmt.Sprintf("%s/%d", s.dir, idx), "password", sqlite.ReducedKDFIterationsNumber)
	s.Require().NoError(err)

	tmpfile, err := ioutil.TempFile("", "multi-accounts-tests-")
	s.Require().NoError(err)
	multiAccounts, err := multiaccounts.InitializeDB(tmpfile.Name())
	s.Require().NoError(err)

	privateKey, err := crypto.GenerateKey()
	s.NoError(err)

	acc := &multiaccounts.Account{KeyUID: "0xdeadbeef"}

	err = service.InitProtocol("Test", privateKey, sqlDB, nil, multiAccounts, acc, nil, nil, zap.NewNop())
	s.NoError(err)

	stack.RegisterLifecycle(service)
	stack.RegisterAPIs(service.APIs())
	stack.RegisterProtocols(service.Protocols())

	s.NoError(err)

	// start the node
	err = stack.Start()
	s.Require().NoError(err)

	// store references
	s.nodes = append(s.nodes, stack)
	s.wakus = append(s.wakus, gethbridge.NewGethWakuWrapper(w))
	s.services = append(s.services, service)
}

func (s *ShhExtSuite) SetupTest() {
	s.dir = s.T().TempDir()
}

func (s *ShhExtSuite) TearDownTest() {
	for _, n := range s.nodes {
		s.NoError(n.Close())
	}
	s.nodes = nil
	s.wakus = nil
	s.services = nil
}

func (s *ShhExtSuite) TestRequestMessagesSuccess() {
	// two nodes needed: client and mailserver
	s.createAndAddNode()
	s.createAndAddNode()

	waitErr := helpers.WaitForPeerAsync(s.nodes[0].Server(), s.nodes[1].Server().Self().URLv4(), p2p.PeerEventTypeAdd, time.Second)
	s.nodes[0].Server().AddPeer(s.nodes[1].Server().Self())
	s.Require().NoError(<-waitErr)

	api := NewPublicAPI(s.services[0])

	_, err := api.RequestMessages(context.Background(), ext.MessagesRequest{
		MailServerPeer: s.nodes[1].Server().Self().URLv4(),
		Topics:         []types.TopicType{{1}},
	})
	s.NoError(err)
}

func (s *ShhExtSuite) TestMultipleRequestMessagesWithoutForce() {
	// two nodes needed: client and mailserver
	s.createAndAddNode()
	s.createAndAddNode()

	waitErr := helpers.WaitForPeerAsync(s.nodes[0].Server(), s.nodes[1].Server().Self().URLv4(), p2p.PeerEventTypeAdd, time.Second)
	s.nodes[0].Server().AddPeer(s.nodes[1].Server().Self())
	s.Require().NoError(<-waitErr)

	api := NewPublicAPI(s.services[0])

	_, err := api.RequestMessages(context.Background(), ext.MessagesRequest{
		MailServerPeer: s.nodes[1].Server().Self().URLv4(),
		Topics:         []types.TopicType{{1}},
	})
	s.NoError(err)
	_, err = api.RequestMessages(context.Background(), ext.MessagesRequest{
		MailServerPeer: s.nodes[1].Server().Self().URLv4(),
		Topics:         []types.TopicType{{2}},
	})
	s.NoError(err)
}

func (s *ShhExtSuite) TestFailedRequestWithUnknownMailServerPeer() {
	s.createAndAddNode()

	api := NewPublicAPI(s.services[0])

	_, err := api.RequestMessages(context.Background(), ext.MessagesRequest{
		MailServerPeer: "enode://19872f94b1e776da3a13e25afa71b47dfa99e658afd6427ea8d6e03c22a99f13590205a8826443e95a37eee1d815fc433af7a8ca9a8d0df7943d1f55684045b7@0.0.0.0:30305",
		Topics:         []types.TopicType{{1}},
	})
	s.EqualError(err, "could not find peer with ID: 10841e6db5c02fc331bf36a8d2a9137a1696d9d3b6b1f872f780e02aa8ec5bba")
}