package tests

import (
	"context"
	"fmt"
	"os"
	"strconv"
	"strings"
	"testing"

	"git.frostfs.info/TrueCloudLab/frostfs-contract/frostfsid/client"
	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
	"github.com/nspcc-dev/neo-go/pkg/wallet"
	"github.com/stretchr/testify/require"
)

type testFrostFSIDClientInvoker struct {
	base *testFrostFSIDInvoker
	cli  *client.Client
	a    awaiter
}

func initFrostfsIFClientTest(t *testing.T) (clientInvoker *testFrostFSIDClientInvoker, cancelFn func()) {
	f := newFrostFSIDInvoker(t)

	wlt := initTmpWallet(t)
	ctx, cancel := context.WithCancel(context.Background())
	address := runRPC(ctx, t, f.e.Chain, wlt)

	cli, rpc := frostfsidRPCClient(t, address, f.contractHash, f.owner)

	clientInvoker = &testFrostFSIDClientInvoker{
		base: f,
		cli:  cli,
		a: awaiter{
			ctx: ctx,
			t:   t,
			rpc: rpc,
		},
	}

	return clientInvoker, func() {
		cancel()
		err := os.Remove(wlt)
		require.NoError(t, err)
	}
}

func frostfsidRPCClient(t *testing.T, address string, contractHash util.Uint160, accs ...*wallet.Account) (*client.Client, *rpcclient.Client) {
	rpcCli, err := rpcclient.New(context.Background(), "http://"+address, rpcclient.Options{})
	require.NoError(t, err)

	var acc *wallet.Account
	if len(accs) == 0 {
		acc, err = wallet.NewAccount()
		require.NoError(t, err)
	} else {
		require.Len(t, accs, 1)
		acc = accs[0]
	}

	cli, err := client.New(rpcCli, acc, contractHash, nil)
	require.NoError(t, err)

	return cli, rpcCli
}

func TestFrostFSID_Client_ContractOwnersManagement(t *testing.T) {
	ffsid, cancel := initFrostfsIFClientTest(t)
	defer cancel()

	committeeInvoker := ffsid.base.CommitteeInvoker()
	defaultOwnerAddress := ffsid.base.owner.ScriptHash()
	_, newOwnerAddress := newKey(t)

	checkListOwnersClient(t, ffsid.cli, defaultOwnerAddress)

	_, _, err := ffsid.cli.AddOwner(newOwnerAddress)
	require.ErrorContains(t, err, "not witnessed")
	committeeInvoker.Invoke(t, stackitem.Null{}, addOwnerMethod, newOwnerAddress)

	checkListOwnersClient(t, ffsid.cli, defaultOwnerAddress, newOwnerAddress)

	_, _, err = ffsid.cli.DeleteOwner(newOwnerAddress)
	require.ErrorContains(t, err, "not witnessed")
	committeeInvoker.Invoke(t, stackitem.Null{}, deleteOwnerMethod, newOwnerAddress)

	checkListOwnersClient(t, ffsid.cli, defaultOwnerAddress)
}

func newKey(t *testing.T) (*keys.PrivateKey, util.Uint160) {
	key, err := keys.NewPrivateKey()
	require.NoError(t, err)
	return key, key.PublicKey().GetScriptHash()
}

func checkListOwnersClient(t *testing.T, cli *client.Client, owners ...util.Uint160) {
	addresses, err := cli.ListOwners()
	require.NoError(t, err)
	require.ElementsMatch(t, addresses, owners)
}

func TestFrostFSID_Client_SubjectManagement(t *testing.T) {
	ffsid, cancel := initFrostfsIFClientTest(t)
	defer cancel()

	subjKey, subjAddr := newKey(t)
	extraKey, _ := newKey(t)
	subjLogin := "subj-login"
	iamPathKV := "iam/path"

	ffsid.a.await(ffsid.cli.CreateSubject(subjKey.PublicKey()))
	ffsid.a.await(ffsid.cli.SetSubjectName(subjAddr, subjLogin))
	ffsid.a.await(ffsid.cli.SetSubjectKV(subjAddr, client.SubjectIAMPathKey, iamPathKV))
	ffsid.a.await(ffsid.cli.AddSubjectKey(subjAddr, extraKey.PublicKey()))

	subj, err := ffsid.cli.GetSubject(subjAddr)
	require.NoError(t, err)
	require.True(t, subjKey.PublicKey().Equal(subj.PrimaryKey))
	require.Equal(t, subj.Name, subjLogin)
	require.Equal(t, map[string]string{client.SubjectIAMPathKey: iamPathKV}, subj.KV)
	require.ElementsMatch(t, []*keys.PublicKey{extraKey.PublicKey()}, subj.AdditionalKeys)

	ffsid.a.await(ffsid.cli.DeleteSubjectKV(subjAddr, client.SubjectIAMPathKey))
	subj, err = ffsid.cli.GetSubject(subjAddr)
	require.NoError(t, err)
	require.Empty(t, subj.KV)

	subjects, err := ffsid.cli.ListSubjects()
	require.NoError(t, err)
	require.ElementsMatch(t, subjects, []util.Uint160{subjAddr})

	subj, err = ffsid.cli.GetSubjectByKey(extraKey.PublicKey())
	require.NoError(t, err)
	require.True(t, subjKey.PublicKey().Equal(subj.PrimaryKey))

	ffsid.a.await(ffsid.cli.RemoveSubjectKey(subjAddr, extraKey.PublicKey()))
	_, err = ffsid.cli.GetSubjectByKey(extraKey.PublicKey())
	require.ErrorContains(t, err, "not found")

	ffsid.a.await(ffsid.cli.DeleteSubject(subjAddr))

	_, err = ffsid.cli.GetSubject(subjAddr)
	require.ErrorContains(t, err, "not found")
	subjects, err = ffsid.cli.ListSubjects()
	require.NoError(t, err)
	require.Empty(t, subjects)
}

func TestFrostFSID_Client_NamespaceManagement(t *testing.T) {
	ffsid, cancel := initFrostfsIFClientTest(t)
	defer cancel()

	subjKey, subjAddr := newKey(t)
	ffsid.a.await(ffsid.cli.CreateSubject(subjKey.PublicKey()))

	namespace := "namespace"
	ffsid.a.await(ffsid.cli.CreateNamespace(namespace))
	_, _, err := ffsid.cli.CreateNamespace(namespace)
	require.ErrorContains(t, err, "already exists")

	ns, err := ffsid.cli.GetNamespace(namespace)
	require.NoError(t, err)
	require.Equal(t, namespace, ns.Name)

	namespaces, err := ffsid.cli.ListNamespaces()
	require.NoError(t, err)
	require.ElementsMatch(t, []*client.Namespace{ns}, namespaces)

	ffsid.a.await(ffsid.cli.AddSubjectToNamespace(subjAddr, namespace))
	_, _, err = ffsid.cli.AddSubjectToNamespace(subjAddr, namespace)
	require.ErrorContains(t, err, "already added")

	subj, err := ffsid.cli.GetSubject(subjAddr)
	require.NoError(t, err)
	require.Equal(t, namespace, subj.Namespace)

	subjects, err := ffsid.cli.ListNamespaceSubjects(namespace)
	require.NoError(t, err)
	require.ElementsMatch(t, []util.Uint160{subjAddr}, subjects)

	ffsid.a.await(ffsid.cli.RemoveSubjectFromNamespace(subjAddr))

	subj, err = ffsid.cli.GetSubject(subjAddr)
	require.NoError(t, err)
	require.Empty(t, subj.Namespace)

	subjects, err = ffsid.cli.ListNamespaceSubjects(namespace)
	require.NoError(t, err)
	require.Empty(t, subjects)
}

func TestFrostFSID_Client_GroupManagement(t *testing.T) {
	ffsid, cancel := initFrostfsIFClientTest(t)
	defer cancel()

	subjKey, subjAddr := newKey(t)
	ffsid.a.await(ffsid.cli.CreateSubject(subjKey.PublicKey()))

	namespace := "namespace"
	ffsid.a.await(ffsid.cli.CreateNamespace(namespace))

	groupName := "group"
	ffsid.a.await(ffsid.cli.CreateGroup(namespace, groupName))
	_, _, err := ffsid.cli.CreateGroup(namespace, groupName)
	require.ErrorContains(t, err, "already exists")

	group, err := ffsid.cli.GetGroup(namespace, groupName)
	require.NoError(t, err)
	require.Equal(t, groupName, group.Name)

	groupExt, err := ffsid.cli.GetGroupExtended(namespace, groupName)
	require.NoError(t, err)
	require.Zero(t, groupExt.SubjectsCount)

	ffsid.a.await(ffsid.cli.AddSubjectToNamespace(subjAddr, namespace))
	ffsid.a.await(ffsid.cli.AddSubjectToGroup(subjAddr, groupName))

	subjExt, err := ffsid.cli.GetSubjectExtended(subjAddr)
	require.NoError(t, err)
	require.ElementsMatch(t, []*client.Group{{Name: groupName, Namespace: namespace}}, subjExt.Groups)

	groupExt, err = ffsid.cli.GetGroupExtended(namespace, groupName)
	require.NoError(t, err)
	require.EqualValues(t, 1, groupExt.SubjectsCount)

	subjects, err := ffsid.cli.ListGroupSubjects(namespace, groupName)
	require.NoError(t, err)
	require.ElementsMatch(t, []util.Uint160{subjAddr}, subjects)

	subjects, err = ffsid.cli.ListNamespaceSubjects(namespace)
	require.NoError(t, err)
	require.ElementsMatch(t, []util.Uint160{subjAddr}, subjects)

	groups, err := ffsid.cli.ListGroups(namespace)
	require.NoError(t, err)
	require.ElementsMatch(t, []*client.Group{{Name: groupName, Namespace: namespace}}, groups)

	ffsid.a.await(ffsid.cli.DeleteGroup(namespace, groupName))
	_, err = ffsid.cli.GetGroup(namespace, groupName)
	require.ErrorContains(t, err, "not found")

	groups, err = ffsid.cli.ListGroups(namespace)
	require.NoError(t, err)
	require.Empty(t, groups)
}

type testSubject struct {
	key  *keys.PrivateKey
	addr util.Uint160
}

func TestFrostFSID_Client_Lists(t *testing.T) {
	ffsid, cancel := initFrostfsIFClientTest(t)
	defer cancel()

	namespaces := []string{"empty-ns0", "ns1", "ns2", "ns3"}

	tx := ffsid.cli.StartTx()
	for _, namespace := range namespaces {
		err := tx.WrapCall(ffsid.cli.CreateNamespaceCall(namespace))
		require.NoError(t, err)
	}
	ffsid.a.await(ffsid.cli.SendTx(tx))

	subjects := make([]testSubject, 10)
	tx = ffsid.cli.StartTx()
	for i := range subjects {
		subjects[i].key, subjects[i].addr = newKey(t)
		err := tx.WrapCall(ffsid.cli.CreateSubjectCall(subjects[i].key.PublicKey()))
		require.NoError(t, err)
	}
	ffsid.a.await(ffsid.cli.SendTx(tx))

	groups := []client.Group{
		{
			Name:      "empty-group0",
			Namespace: namespaces[0],
		},
		{
			Name:      "empty-group1",
			Namespace: namespaces[1],
		},
		{
			Name:      "group2",
			Namespace: namespaces[1],
		},
		{
			Name:      "group3",
			Namespace: namespaces[2],
		},
		{
			Name:      "group4",
			Namespace: namespaces[3],
		},
		{
			Name:      "group5",
			Namespace: namespaces[3],
		},
	}

	tx = ffsid.cli.StartTx()
	for _, group := range groups {
		err := tx.WrapCall(ffsid.cli.CreateGroupCall(group.Namespace, group.Name))
		require.NoError(t, err)
	}
	ffsid.a.await(ffsid.cli.SendTx(tx))

	addSubjectsToNamespaces(t, ffsid, namespaces, subjects)
	addSubjectsToGroups(t, ffsid, groups, subjects)

	nsList, err := ffsid.cli.ListNamespaces()
	require.NoError(t, err)
	require.ElementsMatch(t, []*client.Namespace{{Name: namespaces[0]}, {Name: namespaces[1]}, {Name: namespaces[2]}, {Name: namespaces[3]}}, nsList)

	nonEmptyNs, err := ffsid.cli.ListNonEmptyNamespaces()
	require.NoError(t, err)
	require.ElementsMatch(t, namespaces[1:], nonEmptyNs)

	checkNamespaceSubjects(t, ffsid.cli, namespaces[0], subjects, 0, 0)
	checkNamespaceSubjects(t, ffsid.cli, namespaces[1], subjects, 0, 3)
	checkNamespaceSubjects(t, ffsid.cli, namespaces[2], subjects, 3, 5)
	checkNamespaceSubjects(t, ffsid.cli, namespaces[3], subjects, 5, 10)

	nonEmptyGroups, err := ffsid.cli.ListNonEmptyGroups(namespaces[1])
	require.NoError(t, err)
	require.ElementsMatch(t, []string{groups[2].Name}, nonEmptyGroups)

	checkGroupSubjects(t, ffsid.cli, groups[0], subjects, 0, 0)
	checkGroupSubjects(t, ffsid.cli, groups[1], subjects, 0, 0)
	checkGroupSubjects(t, ffsid.cli, groups[2], subjects, 2, 3)
	checkGroupSubjects(t, ffsid.cli, groups[3], subjects, 3, 5)
	checkGroupSubjects(t, ffsid.cli, groups[4], subjects, 6, 8)
	checkGroupSubjects(t, ffsid.cli, groups[5], subjects, 8, 10)
}

func addSubjectsToNamespaces(t *testing.T, ffsid *testFrostFSIDClientInvoker, namespaces []string, subjects []testSubject) {
	cli := ffsid.cli

	tx := cli.StartTx()
	for _, subject := range subjects[:3] {
		err := tx.WrapCall(cli.AddSubjectToNamespaceCall(subject.addr, namespaces[1]))
		require.NoError(t, err)
	}
	ffsid.a.await(cli.SendTx(tx))

	tx = cli.StartTx()
	for _, subject := range subjects[3:5] {
		err := tx.WrapCall(cli.AddSubjectToNamespaceCall(subject.addr, namespaces[2]))
		require.NoError(t, err)
	}
	ffsid.a.await(cli.SendTx(tx))

	tx = cli.StartTx()
	for _, subject := range subjects[5:] {
		err := tx.WrapCall(cli.AddSubjectToNamespaceCall(subject.addr, namespaces[3]))
		require.NoError(t, err)
	}
	ffsid.a.await(cli.SendTx(tx))
}

func addSubjectsToGroups(t *testing.T, ffsid *testFrostFSIDClientInvoker, groups []client.Group, subjects []testSubject) {
	cli := ffsid.cli
	tx := cli.StartTx()

	err := tx.WrapCall(cli.AddSubjectToGroupCall(subjects[2].addr, groups[2].Name))
	require.NoError(t, err)

	err = tx.WrapCall(cli.AddSubjectToGroupCall(subjects[3].addr, groups[3].Name))
	require.NoError(t, err)
	err = tx.WrapCall(cli.AddSubjectToGroupCall(subjects[4].addr, groups[3].Name))
	require.NoError(t, err)

	ffsid.a.await(cli.SendTx(tx))

	// we have to start new tx because of insufficient gas / gas limit exceeded error
	tx = cli.StartTx()

	err = tx.WrapCall(cli.AddSubjectToGroupCall(subjects[6].addr, groups[4].Name))
	require.NoError(t, err)
	err = tx.WrapCall(cli.AddSubjectToGroupCall(subjects[7].addr, groups[4].Name))
	require.NoError(t, err)
	err = tx.WrapCall(cli.AddSubjectToGroupCall(subjects[8].addr, groups[5].Name))
	require.NoError(t, err)
	err = tx.WrapCall(cli.AddSubjectToGroupCall(subjects[9].addr, groups[5].Name))
	require.NoError(t, err)

	ffsid.a.await(cli.SendTx(tx))
}

func checkNamespaceSubjects(t *testing.T, cli *client.Client, ns string, subjects []testSubject, start, end int) {
	nsSubjects, err := cli.ListNamespaceSubjects(ns)
	require.NoError(t, err)
	require.ElementsMatch(t, subjSlice(subjects, start, end), nsSubjects)
}

func checkGroupSubjects(t *testing.T, cli *client.Client, group client.Group, subjects []testSubject, start, end int) {
	groupSubjects, err := cli.ListGroupSubjects(group.Namespace, group.Name)
	require.NoError(t, err)
	require.ElementsMatch(t, subjSlice(subjects, start, end), groupSubjects)
}

func subjSlice(subjects []testSubject, start, end int) []util.Uint160 {
	res := make([]util.Uint160, 0, end-start)
	for i := start; i < end; i++ {
		res = append(res, subjects[i].addr)
	}
	return res
}

func TestFrostFSID_Client_UseCaseWithS3GW(t *testing.T) {
	ffsid, cancel := initFrostfsIFClientTest(t)
	defer cancel()

	namespace := "namespace"
	login := "login"
	dataUserKey, dataUserAddr := newKey(t)
	extraDataUserKey, _ := newKey(t)

	// admin
	tx := ffsid.cli.StartTx()
	err := tx.WrapCall(ffsid.cli.CreateNamespaceCall(namespace))
	require.NoError(t, err)
	err = tx.WrapCall(ffsid.cli.CreateSubjectCall(dataUserKey.PublicKey()))
	require.NoError(t, err)
	err = tx.WrapCall(ffsid.cli.SetSubjectNameCall(dataUserAddr, login))
	require.NoError(t, err)
	err = tx.WrapCall(ffsid.cli.AddSubjectKeyCall(dataUserAddr, extraDataUserKey.PublicKey()))
	require.NoError(t, err)
	err = tx.WrapCall(ffsid.cli.AddSubjectToNamespaceCall(dataUserAddr, namespace))
	require.NoError(t, err)
	ffsid.a.await(ffsid.cli.SendTx(tx))

	// s3-gw
	subj, err := ffsid.cli.GetSubjectByKey(extraDataUserKey.PublicKey())
	require.NoError(t, err)
	require.Equal(t, login, subj.Name)
	require.True(t, dataUserKey.PublicKey().Equal(subj.PrimaryKey))
	require.Equal(t, namespace, subj.Namespace)
}

func TestFrostFSID_Client_UseCaseListNSSubjects(t *testing.T) {
	ffsid, cancel := initFrostfsIFClientTest(t)
	defer cancel()

	namespace := "namespace"
	group := "group"

	tx := ffsid.cli.StartTx()
	err := tx.WrapCall(ffsid.cli.CreateNamespaceCall(namespace))
	require.NoError(t, err)
	err = tx.WrapCall(ffsid.cli.CreateGroupCall(namespace, group))
	require.NoError(t, err)
	ffsid.a.await(ffsid.cli.SendTx(tx))

	// admin

	subjects := make([]testSubject, 5)

	for i := range subjects {
		tx = ffsid.cli.StartTx()
		subjects[i].key, subjects[i].addr = newKey(t)
		err = tx.WrapCall(ffsid.cli.CreateSubjectCall(subjects[i].key.PublicKey()))
		require.NoError(t, err)
		err = tx.WrapCall(ffsid.cli.SetSubjectNameCall(subjects[i].addr, "login"+strconv.Itoa(i)))
		require.NoError(t, err)
		err = tx.WrapCall(ffsid.cli.AddSubjectToNamespaceCall(subjects[i].addr, namespace))
		require.NoError(t, err)

		if i > len(subjects)/2 {
			err = tx.WrapCall(ffsid.cli.AddSubjectToGroupCall(subjects[i].addr, group))
			require.NoError(t, err)
		}
		ffsid.a.await(ffsid.cli.SendTx(tx))
	}

	nsSubjects, err := ffsid.cli.ListNamespaceSubjects(namespace)
	require.NoError(t, err)

	res := make([]*client.SubjectExtended, len(nsSubjects))
	for i, subj := range nsSubjects {
		res[i], err = ffsid.cli.GetSubjectExtended(subj)
		require.NoError(t, err)
	}
	prettyPrintExtendedSubjects(res)
}

func prettyPrintExtendedSubjects(subjects []*client.SubjectExtended) {
	for _, subj := range subjects {
		var sb strings.Builder
		sb.WriteString(fmt.Sprintf("login: %s, namespace: %v, groups: [ ", subj.Name, subj.Namespace))

		for _, group := range subj.Groups {
			sb.WriteString(group.Namespace + ":" + group.Name + " ")
		}

		sb.WriteByte(']')
		fmt.Println(sb.String())
	}
}