import encoding.base64

struct TestPair {
	decoded string
	encoded string
}

const (
	pairs    = [
		// RFC 3548 examples
		TestPair{'\x14\xfb\x9c\x03\xd9\x7e', 'FPucA9l+'},
		TestPair{'\x14\xfb\x9c\x03\xd9', 'FPucA9k='},
		TestPair{'\x14\xfb\x9c\x03', 'FPucAw=='},
		// RFC 4648 examples
		TestPair{'', ''},
		TestPair{'f', 'Zg=='},
		TestPair{'fo', 'Zm8='},
		TestPair{'foo', 'Zm9v'},
		TestPair{'foob', 'Zm9vYg=='},
		TestPair{'fooba', 'Zm9vYmE='},
		TestPair{'foobar', 'Zm9vYmFy'},
		// Wikipedia examples
		TestPair{'sure.', 'c3VyZS4='},
		TestPair{'sure', 'c3VyZQ=='},
		TestPair{'sur', 'c3Vy'},
		TestPair{'su', 'c3U='},
		TestPair{'leasure.', 'bGVhc3VyZS4='},
		TestPair{'easure.', 'ZWFzdXJlLg=='},
		TestPair{'asure.', 'YXN1cmUu'},
		TestPair{'sure.', 'c3VyZS4='},
	]

	man_pair = TestPair{'Man is distinguished, not only by his reason, but by this singular passion from other animals, which is a lust of the mind, that by a perseverance of delight in the continued and indefatigable generation of knowledge, exceeds the short vehemence of any carnal pleasure.', 'TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGludWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRoZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4='}
)

fn test_decode() {
	assert base64.decode(man_pair.encoded) == man_pair.decoded.bytes()

	// Test for incorrect padding.
	assert base64.decode('aGk') == ''.bytes()
	assert base64.decode('aGk=') == 'hi'.bytes()
	assert base64.decode('aGk==') == ''.bytes()

	for i, p in pairs {
		got := base64.decode(p.encoded)
		if got != p.decoded.bytes() {
			eprintln('pairs[$i]: expected = $p.decoded, got = $got')
			assert false
		}
	}
}

fn test_decode_str() {
	assert base64.decode_str(man_pair.encoded) == man_pair.decoded

	// Test for incorrect padding.
	assert base64.decode_str('aGk') == ''
	assert base64.decode_str('aGk=') == 'hi'
	assert base64.decode_str('aGk==') == ''

	for i, p in pairs {
		got := base64.decode_str(p.encoded)
		if got != p.decoded {
			eprintln('pairs[$i]: expected = $p.decoded, got = $got')
			assert false
		}
	}
}

fn test_encode() {
	assert base64.encode(man_pair.decoded.bytes()) == man_pair.encoded

	for i, p in pairs {
		got := base64.encode(p.decoded.bytes())
		if got != p.encoded {
			eprintln('pairs[$i]: expected = $p.encoded, got = $got')
			assert false
		}
	}
}

fn test_encode_str() {
	assert base64.encode_str(man_pair.decoded) == man_pair.encoded

	for i, p in pairs {
		got := base64.encode_str(p.decoded)
		if got != p.encoded {
			eprintln('pairs[$i]: expected = $p.encoded, got = $got')
			assert false
		}
	}
}

fn test_url_encode() {
	test := base64.url_encode('Hello Base64Url encoding!'.bytes())
	assert test == 'SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ'
}

fn test_url_encode_str() {
	test := base64.url_encode_str('Hello Base64Url encoding!')
	assert test == 'SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ'
}

fn test_url_decode() {
	test := base64.url_decode('SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ')
	assert test == 'Hello Base64Url encoding!'.bytes()
}

fn test_url_decode_str() {
	test := base64.url_decode_str('SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ')
	assert test == 'Hello Base64Url encoding!'
}

fn test_encode_null_byte() {
	assert base64.encode([byte(`A`), 0, `C`]) == 'QQBD'
}

fn test_encode_null_byte_str() {
	// While this works, bytestr() does a memcpy
	s := [byte(`A`), 0, `C`].bytestr()
	assert base64.encode_str(s) == 'QQBD'
}

fn test_decode_null_byte() {
	assert base64.decode('QQBD') == [byte(`A`), 0, `C`]
}

fn test_decode_null_byte_str() {
	// While this works, bytestr() does a memcpy
	s := [byte(`A`), 0, `C`].bytestr()
	assert base64.decode_str('QQBD') == s
}

fn test_decode_in_buffer_bytes() {
	rfc4648_pairs := [
		TestPair{'foob', 'Zm9vYg=='},
		TestPair{'fooba', 'Zm9vYmE='},
		TestPair{'foobar', 'Zm9vYmFy'},
	]
	mut src_dec_buf := []byte{len: 8}
	mut src_enc_buf := []byte{len: 8}
	mut out_buf := []byte{len: 8}

	for p in rfc4648_pairs {
		src_dec_buf = p.decoded.bytes()
		src_enc_buf = p.encoded.bytes()
		n := base64.decode_in_buffer_bytes(src_enc_buf, out_buf.data)
		assert src_dec_buf == out_buf[..n]
	}
}