package tests

import (
	"path"
	"testing"

	"git.frostfs.info/TrueCloudLab/frostfs-contract/policy"
	"github.com/nspcc-dev/neo-go/pkg/neotest"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"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, 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)
	checkChains(t, e, "mynamespace", "cnr1", "ingress", [][]byte{p1, p2, p33}) // Override chain.

	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 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)
	require.Equal(t, 1, s.Len())

	if len(expected) == 0 {
		_, ok := s.Pop().Item().(stackitem.Null)
		require.True(t, ok)
		return
	}

	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)
}