package hashutil_test

import (
	"encoding/hex"
	"testing"

	fuzz "github.com/google/gofuzz"
	pb "github.com/prysmaticlabs/prysm/proto/testing"
	"github.com/prysmaticlabs/prysm/shared/bytesutil"
	"github.com/prysmaticlabs/prysm/shared/hashutil"
)

func TestHash(t *testing.T) {
	hashOf0 := [32]byte{110, 52, 11, 156, 255, 179, 122, 152, 156, 165, 68, 230, 187, 120, 10, 44, 120, 144, 29, 63, 179, 55, 56, 118, 133, 17, 163, 6, 23, 175, 160, 29}
	hash := hashutil.Hash([]byte{0})
	if hash != hashOf0 {
		t.Fatalf("expected hash and computed hash are not equal %d, %d", hash, hashOf0)
	}

	hashOf1 := [32]byte{75, 245, 18, 47, 52, 69, 84, 197, 59, 222, 46, 187, 140, 210, 183, 227, 209, 96, 10, 214, 49, 195, 133, 165, 215, 204, 226, 60, 119, 133, 69, 154}
	hash = hashutil.Hash([]byte{1})
	if hash != hashOf1 {
		t.Fatalf("expected hash and computed hash are not equal %d, %d", hash, hashOf1)
	}

	if hashOf0 == hashOf1 {
		t.Fatalf("expected hash and computed hash are equal %d, %d", hash, hashOf1)
	}
}

func TestHashKeccak256(t *testing.T) {
	hashOf0 := [32]byte{188, 54, 120, 158, 122, 30, 40, 20, 54, 70, 66, 41, 130, 143, 129, 125, 102, 18, 247, 180, 119, 214, 101, 145, 255, 150, 169, 224, 100, 188, 201, 138}
	hash := hashutil.HashKeccak256([]byte{0})
	if hash != hashOf0 {
		t.Fatalf("expected hash and computed hash are not equal %d, %d", hash, hashOf0)
	}

	hashOf1 := [32]byte{95, 231, 249, 119, 231, 29, 186, 46, 161, 166, 142, 33, 5, 123, 238, 187, 155, 226, 172, 48, 198, 65, 10, 163, 141, 79, 63, 190, 65, 220, 255, 210}
	hash = hashutil.HashKeccak256([]byte{1})
	if hash != hashOf1 {
		t.Fatalf("expected hash and computed hash are not equal %d, %d", hash, hashOf1)
	}

	if hashOf0 == hashOf1 {
		t.Fatalf("expected hash and computed hash are equal %d, %d", hash, hashOf1)
	}

	// Same hashing test from go-ethereum for keccak256
	hashOfabc, _ := hex.DecodeString("4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45")
	hash = hashutil.HashKeccak256([]byte("abc"))

	h := bytesutil.ToBytes32(hashOfabc)

	if hash != h {
		t.Fatalf("expected hash and computed hash are not equal %d, %d", hash, h)
	}
}

func TestHashProto(t *testing.T) {
	msg1 := &pb.Puzzle{
		Challenge: "hello",
	}
	msg2 := &pb.Puzzle{
		Challenge: "hello",
	}
	h1, err := hashutil.HashProto(msg1)
	if err != nil {
		t.Fatalf("Could not hash proto message: %v", err)
	}
	h2, err := hashutil.HashProto(msg2)
	if err != nil {
		t.Fatalf("Could not hash proto message: %v", err)
	}
	if h1 != h2 {
		t.Errorf("Expected hashes to equal, received %#x == %#x", h1, h2)
	}
}

func TestHashProtoFuzz(t *testing.T) {
	f := fuzz.New().NilChance(.2)

	for i := 0; i < 1000; i++ {
		msg := &pb.AddressBook{}
		f.Fuzz(msg)
		_, _ = hashutil.HashProto(msg)
	}
}