package bip39

import (
	"crypto/rand"
	"encoding/hex"
	"testing"
)

type vector struct {
	entropy  string
	mnemonic string
	seed     string
}

func TestNewMnemonic(t *testing.T) {
	t.Parallel()

	for _, vector := range testVectors() {
		entropy, err := hex.DecodeString(vector.entropy)
		assertNil(t, err)

		mnemonic, err := NewMnemonic(entropy)
		assertNil(t, err)
		assertEqualString(t, vector.mnemonic, mnemonic)

		seed := NewSeed(mnemonic, "TREZOR")
		assertEqualString(t, vector.seed, hex.EncodeToString(seed))
	}
}

func TestNewMnemonicInvalidEntropy(t *testing.T) {
	t.Parallel()

	_, err := NewMnemonic([]byte{})
	assertNotNil(t, err)
}

func TestIsMnemonicValid(t *testing.T) {
	t.Parallel()

	for _, vector := range badMnemonicSentences() {
		assertFalse(t, IsMnemonicValid(vector.mnemonic))
	}

	for _, vector := range testVectors() {
		assertTrue(t, IsMnemonicValid(vector.mnemonic))
	}
}

func TestPadByteSlice(t *testing.T) {
	t.Parallel()

	assertEqualByteSlices(t, []byte{0}, padByteSlice([]byte{}, 1))
	assertEqualByteSlices(t, []byte{0, 1}, padByteSlice([]byte{1}, 2))
	assertEqualByteSlices(t, []byte{1, 1}, padByteSlice([]byte{1, 1}, 2))
	assertEqualByteSlices(t, []byte{1, 1, 1}, padByteSlice([]byte{1, 1, 1}, 2))
}

func TestEntropyFromMnemonic128(t *testing.T) {
	t.Parallel()

	testEntropyFromMnemonic(t, 128)
}

func TestEntropyFromMnemonic160(t *testing.T) {
	t.Parallel()

	testEntropyFromMnemonic(t, 160)
}

func TestEntropyFromMnemonic192(t *testing.T) {
	t.Parallel()

	testEntropyFromMnemonic(t, 192)
}

func TestEntropyFromMnemonic224(t *testing.T) {
	t.Parallel()

	testEntropyFromMnemonic(t, 224)
}

func TestEntropyFromMnemonic256(t *testing.T) {
	t.Parallel()

	testEntropyFromMnemonic(t, 256)
}

//nolint:dupword,lll // the test vector, kept as upstream wrote it
func TestEntropyFromMnemonicInvalidChecksum(t *testing.T) {
	t.Parallel()

	_, err := EntropyFromMnemonic("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon yellow")
	assertEqual(t, ErrChecksumIncorrect, err)
}

//nolint:dupword // the test vectors, kept as upstream wrote them
func TestEntropyFromMnemonicInvalidMnemonicSize(t *testing.T) {
	t.Parallel()

	for _, mnemonic := range []string{
		"a a a a a a a a a a a a a a a a a a a a a a a a a", // Too many words
		"a",                           // Too few
		"a a a a a a a a a a a a a a", // Not multiple of 3
	} {
		_, err := EntropyFromMnemonic(mnemonic)
		assertEqual(t, ErrInvalidMnemonic, err)
	}
}

func testEntropyFromMnemonic(t *testing.T, bitSize int) {
	t.Helper()

	for range 512 {
		expectedEntropy := make([]byte, bitSize/8)
		_, err := rand.Read(expectedEntropy)
		assertNil(t, err)
		assertTrue(t, len(expectedEntropy) != 0)

		mnemonic, err := NewMnemonic(expectedEntropy)
		assertNil(t, err)
		assertTrue(t, len(mnemonic) != 0)

		actualEntropy, err := EntropyFromMnemonic(mnemonic)
		assertNil(t, err)
		assertEqualByteSlices(t, expectedEntropy, actualEntropy)
	}
}

//nolint:dupword,funlen,lll // the BIP-39 test vectors, kept as upstream wrote them
func testVectors() []vector {
	return []vector{
		{
			entropy:  "00000000000000000000000000000000",
			mnemonic: "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about",
			seed:     "c55257c360c07c72029aebc1b53c05ed0362ada38ead3e3e9efa3708e53495531f09a6987599d18264c1e1c92f2cf141630c7a3c4ab7c81b2f001698e7463b04",
		},
		{
			entropy:  "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f",
			mnemonic: "legal winner thank year wave sausage worth useful legal winner thank yellow",
			seed:     "2e8905819b8723fe2c1d161860e5ee1830318dbf49a83bd451cfb8440c28bd6fa457fe1296106559a3c80937a1c1069be3a3a5bd381ee6260e8d9739fce1f607",
		},
		{
			entropy:  "80808080808080808080808080808080",
			mnemonic: "letter advice cage absurd amount doctor acoustic avoid letter advice cage above",
			seed:     "d71de856f81a8acc65e6fc851a38d4d7ec216fd0796d0a6827a3ad6ed5511a30fa280f12eb2e47ed2ac03b5c462a0358d18d69fe4f985ec81778c1b370b652a8",
		},
		{
			entropy:  "ffffffffffffffffffffffffffffffff",
			mnemonic: "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong",
			seed:     "ac27495480225222079d7be181583751e86f571027b0497b5b5d11218e0a8a13332572917f0f8e5a589620c6f15b11c61dee327651a14c34e18231052e48c069",
		},
		{
			entropy:  "000000000000000000000000000000000000000000000000",
			mnemonic: "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon agent",
			seed:     "035895f2f481b1b0f01fcf8c289c794660b289981a78f8106447707fdd9666ca06da5a9a565181599b79f53b844d8a71dd9f439c52a3d7b3e8a79c906ac845fa",
		},
		{
			entropy:  "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f",
			mnemonic: "legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal will",
			seed:     "f2b94508732bcbacbcc020faefecfc89feafa6649a5491b8c952cede496c214a0c7b3c392d168748f2d4a612bada0753b52a1c7ac53c1e93abd5c6320b9e95dd",
		},
		{
			entropy:  "808080808080808080808080808080808080808080808080",
			mnemonic: "letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter always",
			seed:     "107d7c02a5aa6f38c58083ff74f04c607c2d2c0ecc55501dadd72d025b751bc27fe913ffb796f841c49b1d33b610cf0e91d3aa239027f5e99fe4ce9e5088cd65",
		},
		{
			entropy:  "ffffffffffffffffffffffffffffffffffffffffffffffff",
			mnemonic: "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo when",
			seed:     "0cd6e5d827bb62eb8fc1e262254223817fd068a74b5b449cc2f667c3f1f985a76379b43348d952e2265b4cd129090758b3e3c2c49103b5051aac2eaeb890a528",
		},
		{
			entropy:  "0000000000000000000000000000000000000000000000000000000000000000",
			mnemonic: "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon art",
			seed:     "bda85446c68413707090a52022edd26a1c9462295029f2e60cd7c4f2bbd3097170af7a4d73245cafa9c3cca8d561a7c3de6f5d4a10be8ed2a5e608d68f92fcc8",
		},
		{
			entropy:  "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f",
			mnemonic: "legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth title",
			seed:     "bc09fca1804f7e69da93c2f2028eb238c227f2e9dda30cd63699232578480a4021b146ad717fbb7e451ce9eb835f43620bf5c514db0f8add49f5d121449d3e87",
		},
		{
			entropy:  "8080808080808080808080808080808080808080808080808080808080808080",
			mnemonic: "letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic bless",
			seed:     "c0c519bd0e91a2ed54357d9d1ebef6f5af218a153624cf4f2da911a0ed8f7a09e2ef61af0aca007096df430022f7a2b6fb91661a9589097069720d015e4e982f",
		},
		{
			entropy:  "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
			mnemonic: "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo vote",
			seed:     "dd48c104698c30cfe2b6142103248622fb7bb0ff692eebb00089b32d22484e1613912f0a5b694407be899ffd31ed3992c456cdf60f5d4564b8ba3f05a69890ad",
		},
		{
			entropy:  "77c2b00716cec7213839159e404db50d",
			mnemonic: "jelly better achieve collect unaware mountain thought cargo oxygen act hood bridge",
			seed:     "b5b6d0127db1a9d2226af0c3346031d77af31e918dba64287a1b44b8ebf63cdd52676f672a290aae502472cf2d602c051f3e6f18055e84e4c43897fc4e51a6ff",
		},
		{
			entropy:  "b63a9c59a6e641f288ebc103017f1da9f8290b3da6bdef7b",
			mnemonic: "renew stay biology evidence goat welcome casual join adapt armor shuffle fault little machine walk stumble urge swap",
			seed:     "9248d83e06f4cd98debf5b6f010542760df925ce46cf38a1bdb4e4de7d21f5c39366941c69e1bdbf2966e0f6e6dbece898a0e2f0a4c2b3e640953dfe8b7bbdc5",
		},
		{
			entropy:  "3e141609b97933b66a060dcddc71fad1d91677db872031e85f4c015c5e7e8982",
			mnemonic: "dignity pass list indicate nasty swamp pool script soccer toe leaf photo multiply desk host tomato cradle drill spread actor shine dismiss champion exotic",
			seed:     "ff7f3184df8696d8bef94b6c03114dbee0ef89ff938712301d27ed8336ca89ef9635da20af07d4175f2bf5f3de130f39c9d9e8dd0472489c19b1a020a940da67",
		},
		{
			entropy:  "0460ef47585604c5660618db2e6a7e7f",
			mnemonic: "afford alter spike radar gate glance object seek swamp infant panel yellow",
			seed:     "65f93a9f36b6c85cbe634ffc1f99f2b82cbb10b31edc7f087b4f6cb9e976e9faf76ff41f8f27c99afdf38f7a303ba1136ee48a4c1e7fcd3dba7aa876113a36e4",
		},
		{
			entropy:  "72f60ebac5dd8add8d2a25a797102c3ce21bc029c200076f",
			mnemonic: "indicate race push merry suffer human cruise dwarf pole review arch keep canvas theme poem divorce alter left",
			seed:     "3bbf9daa0dfad8229786ace5ddb4e00fa98a044ae4c4975ffd5e094dba9e0bb289349dbe2091761f30f382d4e35c4a670ee8ab50758d2c55881be69e327117ba",
		},
		{
			entropy:  "2c85efc7f24ee4573d2b81a6ec66cee209b2dcbd09d8eddc51e0215b0b68e416",
			mnemonic: "clutch control vehicle tonight unusual clog visa ice plunge glimpse recipe series open hour vintage deposit universe tip job dress radar refuse motion taste",
			seed:     "fe908f96f46668b2d5b37d82f558c77ed0d69dd0e7e043a5b0511c48c2f1064694a956f86360c93dd04052a8899497ce9e985ebe0c8c52b955e6ae86d4ff4449",
		},
		{
			entropy:  "eaebabb2383351fd31d703840b32e9e2",
			mnemonic: "turtle front uncle idea crush write shrug there lottery flower risk shell",
			seed:     "bdfb76a0759f301b0b899a1e3985227e53b3f51e67e3f2a65363caedf3e32fde42a66c404f18d7b05818c95ef3ca1e5146646856c461c073169467511680876c",
		},
		{
			entropy:  "7ac45cfe7722ee6c7ba84fbc2d5bd61b45cb2fe5eb65aa78",
			mnemonic: "kiss carry display unusual confirm curtain upgrade antique rotate hello void custom frequent obey nut hole price segment",
			seed:     "ed56ff6c833c07982eb7119a8f48fd363c4a9b1601cd2de736b01045c5eb8ab4f57b079403485d1c4924f0790dc10a971763337cb9f9c62226f64fff26397c79",
		},
		{
			entropy:  "4fa1a8bc3e6d80ee1316050e862c1812031493212b7ec3f3bb1b08f168cabeef",
			mnemonic: "exile ask congress lamp submit jacket era scheme attend cousin alcohol catch course end lucky hurt sentence oven short ball bird grab wing top",
			seed:     "095ee6f817b4c2cb30a5a797360a81a40ab0f9a4e25ecd672a3f58a0b5ba0687c096a6b14d2c0deb3bdefce4f61d01ae07417d502429352e27695163f7447a8c",
		},
		{
			entropy:  "18ab19a9f54a9274f03e5209a2ac8a91",
			mnemonic: "board flee heavy tunnel powder denial science ski answer betray cargo cat",
			seed:     "6eff1bb21562918509c73cb990260db07c0ce34ff0e3cc4a8cb3276129fbcb300bddfe005831350efd633909f476c45c88253276d9fd0df6ef48609e8bb7dca8",
		},
		{
			entropy:  "18a2e1d81b8ecfb2a333adcb0c17a5b9eb76cc5d05db91a4",
			mnemonic: "board blade invite damage undo sun mimic interest slam gaze truly inherit resist great inject rocket museum chief",
			seed:     "f84521c777a13b61564234bf8f8b62b3afce27fc4062b51bb5e62bdfecb23864ee6ecf07c1d5a97c0834307c5c852d8ceb88e7c97923c0a3b496bedd4e5f88a9",
		},
		{
			entropy:  "15da872c95a13dd738fbf50e427583ad61f18fd99f628c417a61cf8343c90419",
			mnemonic: "beyond stage sleep clip because twist token leaf atom beauty genius food business side grid unable middle armed observe pair crouch tonight away coconut",
			seed:     "b15509eaa2d09d3efd3e006ef42151b30367dc6e3aa5e44caba3fe4d3e352e65101fbdb86a96776b91946ff06f8eac594dc6ee1d3e82a42dfe1b40fef6bcc3fd",
		},
	}
}

//nolint:dupword,lll // the test vectors, kept as upstream wrote them
func badMnemonicSentences() []vector {
	return []vector{
		{mnemonic: "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon"},
		{mnemonic: "legal winner thank year wave sausage worth useful legal winner thank yellow yellow"},
		{mnemonic: "letter advice cage absurd amount doctor acoustic avoid letter advice caged above"},
		{mnemonic: "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo, wrong"},
		{mnemonic: "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon"},
		{mnemonic: "legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal will will will"},
		{mnemonic: "letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter always."},
		{mnemonic: "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo why"},
		{mnemonic: "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon art art"},
		{mnemonic: "legal winner thank year wave sausage worth useful legal winner thanks year wave worth useful legal winner thank year wave sausage worth title"},
		{mnemonic: "letter advice cage absurd amount doctor acoustic avoid letters advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic bless"},
		{mnemonic: "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo voted"},
		{mnemonic: "jello better achieve collect unaware mountain thought cargo oxygen act hood bridge"},
		{mnemonic: "renew, stay, biology, evidence, goat, welcome, casual, join, adapt, armor, shuffle, fault, little, machine, walk, stumble, urge, swap"},
		{mnemonic: "dignity pass list indicate nasty"},

		// From issue 32
		{mnemonic: "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon letter"},
	}
}

func assertNil(t *testing.T, object any) {
	t.Helper()

	if object != nil {
		t.Errorf("Expected nil, got %v", object)
	}
}

func assertNotNil(t *testing.T, object any) {
	t.Helper()

	if object == nil {
		t.Error("Expected not nil")
	}
}

func assertTrue(t *testing.T, a bool) {
	t.Helper()

	if !a {
		t.Error("Expected true, got false")
	}
}

func assertFalse(t *testing.T, a bool) {
	t.Helper()

	if a {
		t.Error("Expected false, got true")
	}
}

func assertEqual(t *testing.T, a, b any) {
	t.Helper()

	if a != b {
		t.Errorf("Objects not equal, expected `%s` and got `%s`", a, b)
	}
}

func assertEqualString(t *testing.T, a, b string) {
	t.Helper()

	if a != b {
		t.Errorf("Strings not equal, expected `%s` and got `%s`", a, b)
	}
}

func assertEqualByteSlices(t *testing.T, a, b []byte) {
	t.Helper()

	if len(a) != len(b) {
		t.Errorf("Byte slices not equal, expected %v and got %v", a, b)

		return
	}

	for i := range a {
		if a[i] != b[i] {
			t.Errorf("Byte slices not equal, expected %v and got %v", a, b)

			return
		}
	}
}