module main

// Note: this should be in vlib/crypto/ed25519/ed25519_test.v
// but is currently one folder below, because of a V parser/symbol registration bug.
// TODO: move this test back to vlib/crypto/ed25519/ed25519_test.v
import os
import sync.pool
import encoding.hex
import crypto.ed25519

const vexe = os.getenv('VEXE')

const vroot = os.dir(vexe)

const testdata = os.join_path(vroot, 'vlib/crypto/ed25519/testdata')

const contents = os.read_lines(os.join_path(testdata, 'sign.input')) or { panic(err) }

/*
struct ZeroReader {}

fn (z ZeroReader) read(mut buf []byte) ?int {
	for i, _ in buf {
		buf[i] = 0
	}
	return buf.len
}
*/

fn test_sign_verify() ? {
	// mut zero := ZeroReader{}
	public, private := ed25519.generate_key() ?

	message := 'test message'.bytes()
	sig := ed25519.sign(private, message) ?
	res := ed25519.verify(public, message, sig) or { false }
	assert res == true

	wrongmessage := 'wrong message'.bytes()
	res2 := ed25519.verify(public, wrongmessage, sig) ?
	assert res2 == false
}

fn test_equal() ? {
	public, private := ed25519.generate_key() ?

	assert public.equal(public) == true

	// This is not AVAILABLE
	/*
	if !public.Equal(crypto.Signer(private).Public()) {
		t.Errorf("private.Public() is not Equal to public: %q", public)
	}*/
	assert private.equal(private) == true

	otherpub, otherpriv := ed25519.generate_key() ?
	assert public.equal(otherpub) == false

	assert private.equal(otherpriv) == false
}

fn test_malleability() ? {
	// https://tools.ietf.org/html/rfc8032#section-5.1.7 adds an additional test
	// that s be in [0, order). This prevents someone from adding a multiple of
	// order to s and obtaining a second valid signature for the same message.
	msg := [byte(0x54), 0x65, 0x73, 0x74]
	sig := [byte(0x7c), 0x38, 0xe0, 0x26, 0xf2, 0x9e, 0x14, 0xaa, 0xbd, 0x05, 0x9a, 0x0f, 0x2d,
		0xb8, 0xb0, 0xcd, 0x78, 0x30, 0x40, 0x60, 0x9a, 0x8b, 0xe6, 0x84, 0xdb, 0x12, 0xf8, 0x2a,
		0x27, 0x77, 0x4a, 0xb0, 0x67, 0x65, 0x4b, 0xce, 0x38, 0x32, 0xc2, 0xd7, 0x6f, 0x8f, 0x6f,
		0x5d, 0xaf, 0xc0, 0x8d, 0x93, 0x39, 0xd4, 0xee, 0xf6, 0x76, 0x57, 0x33, 0x36, 0xa5, 0xc5,
		0x1e, 0xb6, 0xf9, 0x46, 0xb3, 0x1d]
	publickey := [byte(0x7d), 0x4d, 0x0e, 0x7f, 0x61, 0x53, 0xa6, 0x9b, 0x62, 0x42, 0xb5, 0x22,
		0xab, 0xbe, 0xe6, 0x85, 0xfd, 0xa4, 0x42, 0x0f, 0x88, 0x34, 0xb1, 0x08, 0xc3, 0xbd, 0xae,
		0x36, 0x9e, 0xf5, 0x49, 0xfa]
	// verify should fail on provided bytes
	res := ed25519.verify(publickey, msg, sig) or { false }
	assert res == false
}

fn works_check_on_sign_input_string(item string) bool {
	// this is core part of the tests sign input
	parts := item.split(':') // []string

	if parts.len != 5 {
		return false
	}
	// assert parts.len == 5
	privbytes := hex.decode(parts[0]) or { panic(err) }
	pubkey := hex.decode(parts[1]) or { panic(err) }
	msg := hex.decode(parts[2]) or { panic(err) }
	mut sig := hex.decode(parts[3]) or { panic(err) }

	if pubkey.len != ed25519.public_key_size {
		return false
	}
	// assert pubkey.len == public_key_size

	sig = sig[..ed25519.signature_size]
	mut priv := []byte{len: ed25519.private_key_size}
	copy(mut priv[..], privbytes)
	copy(mut priv[32..], pubkey)

	sig2 := ed25519.sign(priv[..], msg) or { panic(err) }
	if sig != sig2[..] {
		return false
	}

	res := ed25519.verify(pubkey, msg, sig2) or { panic(err) }
	// assert res == true
	if !res {
		return false
	}

	priv2 := ed25519.new_key_from_seed(priv[..32])
	if ed25519.PrivateKey(priv[..]) != priv2 {
		return false
	}

	pubkey2 := priv2.public_key()
	if ed25519.PublicKey(pubkey) != pubkey2 {
		return false
	}

	seed2 := priv2.seed()
	if priv[0..32] != seed2 {
		return false
	}

	return true
}

fn worker_for_string_content(p &pool.PoolProcessor, idx int, worker_id int) &SignResult {
	item := p.get_item<string>(idx)
	// println('worker_s worker_id: $worker_id | idx: $idx ')
	res := works_check_on_sign_input_string(item)
	mut sr := &SignResult{
		item: item
		result: res
	}
	return sr
}

struct SignResult {
mut:
	item   string
	result bool
}

// This test read a lot of entries in `testdata/sign.input`
// so, maybe need a long time to finish.
// be quiet and patient
fn test_input_from_djb_ed25519_crypto_sign_input_with_syncpool() ? {
	// contents := os.read_lines('testdata/sign.input') or { panic(err) } //[]string
	mut pool_s := pool.new_pool_processor(
		callback: worker_for_string_content
		maxjobs: 4
	)
	pool_s.work_on_items<string>(contents)
	for i, x in pool_s.get_results<SignResult>() {
		// println("i: $i = $x.result")
		assert x.result == true
	}
}

// same as above, but without sync.pool
/*
fn test_input_from_djb_ed25519_crypto_sign_input_without_syncpool() ? {
	// contents := os.read_lines('testdata/sign.input') or { panic(err) } //[]string
	for i, item in ed25519.contents {
		parts := item.split(':') // []string
		// println(parts)
		/*
		if parts.len != 5 {
			lg.fatal('not contains len 5')
		}*/
		assert parts.len == 5
		privbytes := hex.decode(parts[0]) ?
		pubkey := hex.decode(parts[1]) ?
		msg := hex.decode(parts[2]) ?
		mut sig := hex.decode(parts[3]) ?
		assert pubkey.len == public_key_size

		sig = sig[..signature_size]
		mut priv := []byte{len: ed25519.private_key_size}
		copy(mut priv[..], privbytes)
		copy(mut priv[32..], pubkey)

		sig2 := ed25519.sign(priv[..], msg) ?
		assert sig == sig2[..]

		res := ed25519.verify(pubkey, msg, sig2) ?
		assert res == true

		priv2 := new_key_from_seed(priv[..32])
		assert priv[..] == priv2

		pubkey2 := priv2.public_key()
		assert pubkey == pubkey2

		seed2 := priv2.seed()
		assert priv[0..32] == seed2
	}
}*/