package trie

import (
	"testing"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/ethdb/memorydb"
)

func TestSizeBug(t *testing.T) {
	st := NewStackTrie(nil)
	nt, _ := New(common.Hash{}, NewDatabase(memorydb.New()))

	leaf := common.FromHex("290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563")
	value := common.FromHex("94cf40d0d2b44f2b66e07cace1372ca42b73cf21a3")

	nt.TryUpdate(leaf, value)
	st.TryUpdate(leaf, value)

	if nt.Hash() != st.Hash() {
		t.Fatalf("error %x != %x", st.Hash(), nt.Hash())
	}
}

func TestEmptyBug(t *testing.T) {
	st := NewStackTrie(nil)
	nt, _ := New(common.Hash{}, NewDatabase(memorydb.New()))

	//leaf := common.FromHex("290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563")
	//value := common.FromHex("94cf40d0d2b44f2b66e07cace1372ca42b73cf21a3")
	kvs := []struct {
		K string
		V string
	}{
		{K: "405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5ace", V: "9496f4ec2bf9dab484cac6be589e8417d84781be08"},
		{K: "40edb63a35fcf86c08022722aa3287cdd36440d671b4918131b2514795fefa9c", V: "01"},
		{K: "b10e2d527612073b26eecdfd717e6a320cf44b4afac2b0732d9fcbe2b7fa0cf6", V: "947a30f7736e48d6599356464ba4c150d8da0302ff"},
		{K: "c2575a0e9e593c00f959f8c92f12db2869c3395a3b0502d05e2516446f71f85b", V: "02"},
	}

	for _, kv := range kvs {
		nt.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
		st.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
	}

	if nt.Hash() != st.Hash() {
		t.Fatalf("error %x != %x", st.Hash(), nt.Hash())
	}
}

func TestValLength56(t *testing.T) {
	st := NewStackTrie(nil)
	nt, _ := New(common.Hash{}, NewDatabase(memorydb.New()))

	//leaf := common.FromHex("290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563")
	//value := common.FromHex("94cf40d0d2b44f2b66e07cace1372ca42b73cf21a3")
	kvs := []struct {
		K string
		V string
	}{
		{K: "405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5ace", V: "1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111"},
	}

	for _, kv := range kvs {
		nt.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
		st.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
	}

	if nt.Hash() != st.Hash() {
		t.Fatalf("error %x != %x", st.Hash(), nt.Hash())
	}
}

// TestUpdateSmallNodes tests a case where the leaves are small (both key and value),
// which causes a lot of node-within-node. This case was found via fuzzing.
func TestUpdateSmallNodes(t *testing.T) {
	st := NewStackTrie(nil)
	nt, _ := New(common.Hash{}, NewDatabase(memorydb.New()))
	kvs := []struct {
		K string
		V string
	}{
		{"63303030", "3041"}, // stacktrie.Update
		{"65", "3000"},       // stacktrie.Update
	}
	for _, kv := range kvs {
		nt.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
		st.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
	}
	if nt.Hash() != st.Hash() {
		t.Fatalf("error %x != %x", st.Hash(), nt.Hash())
	}
}

// TestUpdateVariableKeys contains a case which stacktrie fails: when keys of different
// sizes are used, and the second one has the same prefix as the first, then the
// stacktrie fails, since it's unable to 'expand' on an already added leaf.
// For all practical purposes, this is fine, since keys are fixed-size length
// in account and storage tries.
//
// The test is marked as 'skipped', and exists just to have the behaviour documented.
// This case was found via fuzzing.
func TestUpdateVariableKeys(t *testing.T) {
	t.SkipNow()
	st := NewStackTrie(nil)
	nt, _ := New(common.Hash{}, NewDatabase(memorydb.New()))
	kvs := []struct {
		K string
		V string
	}{
		{"0x33303534636532393561313031676174", "303030"},
		{"0x3330353463653239356131303167617430", "313131"},
	}
	for _, kv := range kvs {
		nt.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
		st.TryUpdate(common.FromHex(kv.K), common.FromHex(kv.V))
	}
	if nt.Hash() != st.Hash() {
		t.Fatalf("error %x != %x", st.Hash(), nt.Hash())
	}
}