package tests

import (
	"bytes"
	"path"
	"testing"

	"git.frostfs.info/TrueCloudLab/frostfs-contract/policy"
	"github.com/nspcc-dev/neo-go/pkg/core/interop/storage"
	"github.com/nspcc-dev/neo-go/pkg/neotest"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/nspcc-dev/neo-go/pkg/vm"
	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
	"github.com/stretchr/testify/require"
)

const policyPath = "../policy"

func deployPolicyContract(t *testing.T, e *neotest.Executor) util.Uint160 {
	cfgPath := path.Join(policyPath, "config.yml")
	c := neotest.CompileFile(t, e.CommitteeHash, policyPath, cfgPath)
	e.DeployContract(t, c, []any{nil})
	return c.Hash
}

func newPolicyInvoker(t *testing.T) *neotest.ContractInvoker {
	e := newExecutor(t)
	h := deployPolicyContract(t, e)
	return e.CommitteeInvoker(h)
}

func TestPolicy(t *testing.T) {
	e := newPolicyInvoker(t)

	// Policies are opaque to the contract and are just raw bytes to store.
	p1 := []byte("chain1")
	p2 := []byte("chain2")
	p3 := []byte("chain3")
	p33 := []byte("chain33")

	e.Invoke(t, stackitem.Null{}, "addChain", policy.Namespace, "mynamespace", "ingress:123", p1)
	checkChains(t, e, "mynamespace", "", "ingress", [][]byte{p1})
	checkChains(t, e, "mynamespace", "", "all", nil)

	e.Invoke(t, stackitem.Null{}, "addChain", policy.Container, "cnr1", "ingress:myrule2", p2)
	checkChains(t, e, "mynamespace", "", "ingress", [][]byte{p1}) // Only namespace chains.
	checkChains(t, e, "mynamespace", "cnr1", "ingress", [][]byte{p1, p2})
	checkChains(t, e, "mynamespace", "cnr1", "all", nil)              // No chains attached to 'all'.
	checkChains(t, e, "mynamespace", "cnr2", "ingress", [][]byte{p1}) // Only namespace, no chains for the container.

	e.Invoke(t, stackitem.Null{}, "addChain", policy.Container, "cnr1", "ingress:myrule3", p3)
	checkChains(t, e, "mynamespace", "cnr1", "ingress", [][]byte{p1, p2, p3})

	e.Invoke(t, stackitem.Null{}, "addChain", policy.Container, "cnr1", "ingress:myrule3", p33)
	checkChain(t, e, policy.Container, "cnr1", "ingress:myrule3", p33)
	checkChains(t, e, "mynamespace", "cnr1", "ingress", [][]byte{p1, p2, p33}) // Override chain.
	checkChainsByPrefix(t, e, policy.Container, "cnr1", "", [][]byte{p2, p33})
	checkChainsByPrefix(t, e, policy.IAM, "", "", nil)

	checkChainsIteratorByPrefix(t, e, policy.Container, "cnr1", "ingress:myrule3", [][]byte{p33})
	checkChainsIteratorByPrefix(t, e, policy.Container, "cnr1", "ingress", [][]byte{p2, p33})

	t.Run("removal", func(t *testing.T) {
		t.Run("wrong name", func(t *testing.T) {
			e.Invoke(t, stackitem.Null{}, "removeChain", policy.Namespace, "mynamespace", "ingress")
			checkChains(t, e, "mynamespace", "", "ingress", [][]byte{p1})
		})

		e.Invoke(t, stackitem.Null{}, "removeChain", policy.Namespace, "mynamespace", "ingress:123")
		checkChains(t, e, "mynamespace", "", "ingress", nil)
		checkChains(t, e, "mynamespace", "cnr1", "ingress", [][]byte{p2, p33}) // Container chains still exist.

		// Remove by prefix.
		e.Invoke(t, stackitem.Null{}, "removeChainsByPrefix", policy.Container, "cnr1", "ingress")
		checkChains(t, e, "mynamespace", "cnr1", "ingress", nil)
	})
}

func TestAutorization(t *testing.T) {
	e := newPolicyInvoker(t)

	e.Invoke(t, stackitem.Null{}, "getAdmin")

	s := e.NewAccount(t, 1_0000_0000)
	c := e.WithSigners(s)

	args := []any{policy.Container, "cnr1", "ingress:myrule3", []byte("opaque")}
	c.InvokeFail(t, policy.ErrNotAuthorized, "addChain", args...)

	e.Invoke(t, stackitem.Null{}, "setAdmin", s.ScriptHash())
	e.Invoke(t, stackitem.NewBuffer(s.ScriptHash().BytesBE()), "getAdmin")

	c.Invoke(t, stackitem.Null{}, "addChain", args...)
}

func checkChains(t *testing.T, e *neotest.ContractInvoker, namespace, container, name string, expected [][]byte) {
	s, err := e.TestInvoke(t, "listChains", namespace, container, name)
	require.NoError(t, err)

	checksChainsOnStack(t, s, expected)
}

func checkChainsByPrefix(t *testing.T, e *neotest.ContractInvoker, kind byte, entityName, prefix string, expected [][]byte) {
	s, err := e.TestInvoke(t, "listChainsByPrefix", kind, entityName, prefix)
	require.NoError(t, err)

	checksChainsOnStack(t, s, expected)
}

func checkChainsIteratorByPrefix(t *testing.T, e *neotest.ContractInvoker, kind byte, entityName, prefix string, expected [][]byte) {
	s, err := e.TestInvoke(t, "iteratorChainsByPrefix", kind, entityName, prefix)
	require.NoError(t, err)

	if s.Len() == 0 {
		t.Fatal("Stack is empty")
	}

	iteratorItem := s.Pop().Value().(*storage.Iterator)
	policys := iteratorToArray(iteratorItem)
	require.Equal(t, len(expected), len(policys))

	for i := range expected {
		bytesPolicy, err := policys[i].TryBytes()
		require.NoError(t, err)
		require.Equal(t, expected[i], bytesPolicy)
	}
}

func checksChainsOnStack(t *testing.T, s *vm.Stack, expected [][]byte) {
	require.Equal(t, 1, s.Len())

	var actual [][]byte
	arr := s.Pop().Array()
	for i := range arr {
		bs, err := arr[i].TryBytes()

		require.NoError(t, err)
		actual = append(actual, bs)
	}

	require.ElementsMatch(t, expected, actual)
}

func checkChain(t *testing.T, e *neotest.ContractInvoker, kind byte, entityName, name string, expected []byte) {
	s, err := e.TestInvoke(t, "getChain", kind, entityName, name)
	require.NoError(t, err)
	require.Equal(t, 1, s.Len())

	require.True(t, bytes.Equal(expected, s.Pop().Bytes()))
}