#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <check.h>

#include "segwit_addr.h"

static const char* valid_checksum[] = {
	"A12UEL5L",
	"an83characterlonghumanreadablepartthatcontainsthenumber1andtheexcludedcharactersbio1tt5tgs",
	"abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw",
	"11qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqc8247j",
	"split1checkupstagehandshakeupstreamerranterredcaperred2y9e3w",
};

static const char* invalid_checksum[] = {
	" 1nwldj5",
	"\x7f""1axkwrx",
	"an84characterslonghumanreadablepartthatcontainsthenumber1andtheexcludedcharactersbio1569pvx",
	"pzry9x0s0muk",
	"1pzry9x0s0muk",
	"x1b4n0q5v",
	"li1dgmt3",
	"de1lg7wt\xff",
};

struct valid_address_data {
	const char* address;
	size_t scriptPubKeyLen;
	const uint8_t scriptPubKey[42];
};

struct invalid_address_data {
	const char* hrp;
	int version;
	size_t program_length;
};

static struct valid_address_data valid_address[] = {
	{
		"BC1QW508D6QEJXTDG4Y5R3ZARVARY0C5XW7KV8F3T4",
		22, {
			0x00, 0x14, 0x75, 0x1e, 0x76, 0xe8, 0x19, 0x91, 0x96, 0xd4, 0x54,
			0x94, 0x1c, 0x45, 0xd1, 0xb3, 0xa3, 0x23, 0xf1, 0x43, 0x3b, 0xd6
		}
	},
	{
		"tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3q0sl5k7",
		34, {
			0x00, 0x20, 0x18, 0x63, 0x14, 0x3c, 0x14, 0xc5, 0x16, 0x68, 0x04,
			0xbd, 0x19, 0x20, 0x33, 0x56, 0xda, 0x13, 0x6c, 0x98, 0x56, 0x78,
			0xcd, 0x4d, 0x27, 0xa1, 0xb8, 0xc6, 0x32, 0x96, 0x04, 0x90, 0x32,
			0x62
		}
	},
	{
		"bc1pw508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7k7grplx",
		42, {
			0x51, 0x28, 0x75, 0x1e, 0x76, 0xe8, 0x19, 0x91, 0x96, 0xd4, 0x54,
			0x94, 0x1c, 0x45, 0xd1, 0xb3, 0xa3, 0x23, 0xf1, 0x43, 0x3b, 0xd6,
			0x75, 0x1e, 0x76, 0xe8, 0x19, 0x91, 0x96, 0xd4, 0x54, 0x94, 0x1c,
			0x45, 0xd1, 0xb3, 0xa3, 0x23, 0xf1, 0x43, 0x3b, 0xd6
		}
	},
	{
		"BC1SW50QA3JX3S",
		4, {
		   0x60, 0x02, 0x75, 0x1e
		}
	},
	{
		"bc1zw508d6qejxtdg4y5r3zarvaryvg6kdaj",
		18, {
			0x52, 0x10, 0x75, 0x1e, 0x76, 0xe8, 0x19, 0x91, 0x96, 0xd4, 0x54,
			0x94, 0x1c, 0x45, 0xd1, 0xb3, 0xa3, 0x23
		}
	},
	{
		"tb1qqqqqp399et2xygdj5xreqhjjvcmzhxw4aywxecjdzew6hylgvsesrxh6hy",
		34, {
			0x00, 0x20, 0x00, 0x00, 0x00, 0xc4, 0xa5, 0xca, 0xd4, 0x62, 0x21,
			0xb2, 0xa1, 0x87, 0x90, 0x5e, 0x52, 0x66, 0x36, 0x2b, 0x99, 0xd5,
			0xe9, 0x1c, 0x6c, 0xe2, 0x4d, 0x16, 0x5d, 0xab, 0x93, 0xe8, 0x64,
			0x33
		}
	}
};

static const char* invalid_address[] = {
	"tc1qw508d6qejxtdg4y5r3zarvary0c5xw7kg3g4ty",
	"bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t5",
	"BC13W508D6QEJXTDG4Y5R3ZARVARY0C5XW7KN40WF2",
	"bc1rw5uspcuh",
	"bc10w508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7kw5rljs90",
	"BC1QR508D6QEJXTDG4Y5R3ZARVARYV98GJ9P",
	"tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3q0sL5k7",
	"bc1zw508d6qejxtdg4y5r3zarvaryvqyzf3du",
	"tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3pjxtptv",
	"bc1gmk9yu",
};

static struct invalid_address_data invalid_address_enc[] = {
	{"BC", 0, 20},
	{"bc", 0, 21},
	{"bc", 17, 32},
	{"bc", 1, 1},
	{"bc", 16, 41},
};

static void segwit_scriptpubkey(uint8_t* scriptpubkey, size_t* scriptpubkeylen, int witver, const uint8_t* witprog, size_t witprog_len) {
	scriptpubkey[0] = witver ? (0x50 + witver) : 0;
	scriptpubkey[1] = witprog_len;
	memcpy(scriptpubkey + 2, witprog, witprog_len);
	*scriptpubkeylen = witprog_len + 2;
}

int my_strncasecmp(const char *s1, const char *s2, size_t n) {
	size_t i = 0;
	while (i < n) {
		char c1 = s1[i];
		char c2 = s2[i];
		if (c1 >= 'A' && c1 <= 'Z') c1 = (c1 - 'A') + 'a';
		if (c2 >= 'A' && c2 <= 'Z') c2 = (c2 - 'A') + 'a';
		if (c1 < c2) return -1;
		if (c1 > c2) return 1;
		if (c1 == 0) return 0;
		++i;
	}
	return 0;
}

START_TEST(test_segwit)
{
	size_t i;
	for (i = 0; i < sizeof(valid_checksum) / sizeof(valid_checksum[0]); ++i) {
		uint8_t data[82];
		char rebuild[92];
		char hrp[84];
		size_t data_len;
		int res = bech32_decode(hrp, data, &data_len, valid_checksum[i]);
		ck_assert_int_eq(res, 1);
		res = bech32_encode(rebuild, hrp, data, data_len);
		ck_assert_int_eq(res, 1);
		ck_assert_int_eq(my_strncasecmp(rebuild, valid_checksum[i], 92), 0);
	}
	for (i = 0; i < sizeof(invalid_checksum) / sizeof(invalid_checksum[0]); ++i) {
		uint8_t data[82];
		char hrp[84];
		size_t data_len;
		int res = bech32_decode(hrp, data, &data_len, invalid_checksum[i]);
		ck_assert_int_eq(res, 0);
	}
	for (i = 0; i < sizeof(valid_address) / sizeof(valid_address[0]); ++i) {
		uint8_t witprog[40];
		size_t witprog_len;
		int witver;
		const char* hrp = "bc";
		uint8_t scriptpubkey[42];
		size_t scriptpubkey_len;
		char rebuild[93];
		int ret = segwit_addr_decode(&witver, witprog, &witprog_len, hrp, valid_address[i].address);
		if (!ret) {
			hrp = "tb";
			ret = segwit_addr_decode(&witver, witprog, &witprog_len, hrp, valid_address[i].address);
		}
		ck_assert_int_eq(ret, 1);
		segwit_scriptpubkey(scriptpubkey, &scriptpubkey_len, witver, witprog, witprog_len);
		ck_assert_int_eq(scriptpubkey_len, valid_address[i].scriptPubKeyLen);
		ck_assert_int_eq(memcmp(scriptpubkey, valid_address[i].scriptPubKey, scriptpubkey_len), 0);
		ck_assert_int_eq(segwit_addr_encode(rebuild, hrp, witver, witprog, witprog_len), 1);
		ck_assert_int_eq(my_strncasecmp(valid_address[i].address, rebuild, 93), 0);
	}
	for (i = 0; i < sizeof(invalid_address) / sizeof(invalid_address[0]); ++i) {
		uint8_t witprog[40];
		size_t witprog_len;
		int witver;
		int ret = segwit_addr_decode(&witver, witprog, &witprog_len, "bc", invalid_address[i]);
		ck_assert_int_eq(ret, 0);
		ret = segwit_addr_decode(&witver, witprog, &witprog_len, "tb", invalid_address[i]);
		ck_assert_int_eq(ret, 0);
	}
	for (i = 0; i < sizeof(invalid_address_enc) / sizeof(invalid_address_enc[0]); ++i) {
		char rebuild[93];
		static const uint8_t program[42] = {0};
		int ret = segwit_addr_encode(rebuild, invalid_address_enc[i].hrp, invalid_address_enc[i].version, program, invalid_address_enc[i].program_length);
		ck_assert_int_eq(ret, 0);
	}
}
END_TEST