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#include <stdint.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <tcl.h>

#include "randombytes.h"
#include "tweetnacl.h"
#include "blake2.h"

#define NANO_SECRET_KEY_LENGTH (crypto_sign_SECRETKEYBYTES - crypto_sign_PUBLICKEYBYTES)
#define NANO_PUBLIC_KEY_LENGTH (crypto_sign_PUBLICKEYBYTES)
#define NANO_BLOCK_HASH_LENGTH 32
#define NANO_WORK_VALUE_LENGTH 8
#define NANO_WORK_HASH_LENGTH  8
#define NANO_WORK_DEFAULT_MIN  0xffffffc000000000LLU
#define TclNano_AttemptAlloc(x) ((void *) Tcl_AttemptAlloc(x))
#define TclNano_Free(x) Tcl_Free((char *) x)

static unsigned char *nano_parse_secret_key(Tcl_Obj *secret_key_only_obj, int *out_key_length) {
	unsigned char *secret_key, *public_key, *secret_key_only;
	int secret_key_length, secret_key_only_length;
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	Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(result, result_length));

	return(TCL_OK);

	/* NOTREACH */
	clientData = clientData;
}

static int nano_validate_work(const unsigned char *blockhash, const unsigned char *work, uint64_t workMin) {
	unsigned char workReversed[NANO_WORK_VALUE_LENGTH], workCheck[NANO_WORK_HASH_LENGTH];
	unsigned int idxIn, idxOut;
	blake2b_state workhash_state;
	uint64_t workValue;
	int blake2_ret;

	idxIn = sizeof(workReversed) - 1;
	idxOut = 0;
	while (idxOut < sizeof(workReversed)) {
		workReversed[idxOut] = work[idxIn];
		idxOut++;
		idxIn--;
	}

	blake2_ret = blake2b_init(&workhash_state, sizeof(workCheck));
	if (blake2_ret != 0) {
		return(0);
	}

	blake2_ret = blake2b_update(&workhash_state, workReversed, sizeof(workReversed));
	if (blake2_ret != 0) {
		return(0);
	}

	blake2_ret = blake2b_update(&workhash_state, blockhash, NANO_BLOCK_HASH_LENGTH);
	if (blake2_ret != 0) {
		return(0);
	}

	blake2_ret = blake2b_final(&workhash_state, workCheck, sizeof(workCheck));
	if (blake2_ret != 0) {
		return(0);
	}

	workValue = 0;
	for (idxIn = sizeof(workCheck); idxIn > 0; idxIn--) {
		workValue <<= 8;
		workValue |= workCheck[idxIn - 1];
	}

	if (workValue < workMin) {
		/* Fails to meet the requirements */
		return(0);
	}

	return(1);
}

static void nano_generate_work(const unsigned char *blockhash, unsigned char *workOut, uint64_t workMin) {
	unsigned char work[NANO_WORK_VALUE_LENGTH];
	unsigned int offset;
	int work_valid;

	memcpy(work, blockhash, sizeof(work));

	while (1) {
		work_valid = nano_validate_work(blockhash, work, workMin);
		if (work_valid) {
			break;
		}

		offset = 0;
		while (work[offset] == 0xff) {
			work[offset] = 0;
			offset++;
			offset %= sizeof(work);
		}

		work[offset] = (((int) work[offset]) + 1) & 0xff;
	}

	memcpy(workOut, work, sizeof(work));

	return;
}

static int nano_tcl_validate_work(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
	unsigned char *blockhash, *work;
	uint64_t workMin = NANO_WORK_DEFAULT_MIN;
	int blockhash_length, work_length;

	if (objc < 3 || objc > 4) {
		Tcl_WrongNumArgs(interp, 1, objv, "workBlockhash work ?workMin?");

		return(TCL_ERROR);
	}

	blockhash = Tcl_GetByteArrayFromObj(objv[1], &blockhash_length);
	if (blockhash_length != NANO_BLOCK_HASH_LENGTH) {
		Tcl_SetResult(interp, "Block hash size is wrong", NULL);

		return(TCL_ERROR);
	}

	work = Tcl_GetByteArrayFromObj(objv[2], &work_length);
	if (work_length != NANO_WORK_VALUE_LENGTH) {
		Tcl_SetResult(interp, "Work size is wrong", NULL);

		return(TCL_ERROR);
	}

	if (objc == 4) {
		/* XXX:TODO: Implement getting a uint64_t from Tcl */
		Tcl_SetResult(interp, "User-supplied workMin is not implemented", NULL);

		return(TCL_ERROR);
	}

	int valid, result;

	valid = nano_validate_work(blockhash, work, workMin);
	if (valid) {
		result = 1;
	} else {
		result = 0;
	}

	Tcl_SetObjResult(interp, Tcl_NewBooleanObj(result));

	return(TCL_OK);

	/* NOTREACH */
	clientData = clientData;
}

static int nano_tcl_generate_work(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
	unsigned char *blockhash;
	unsigned char work[NANO_WORK_VALUE_LENGTH];
	uint64_t workMin = NANO_WORK_DEFAULT_MIN;
	int blockhash_length;

	if (objc < 2 || objc > 3) {
		Tcl_WrongNumArgs(interp, 1, objv, "workBlockhash ?workMin?");

		return(TCL_ERROR);
	}

	blockhash = Tcl_GetByteArrayFromObj(objv[1], &blockhash_length);
	if (blockhash_length != NANO_BLOCK_HASH_LENGTH) {
		Tcl_SetResult(interp, "Block hash size is wrong", NULL);

		return(TCL_ERROR);
	}

	if (objc == 3) {
		/* XXX:TODO: Implement getting a uint64_t from Tcl */
		Tcl_SetResult(interp, "User-supplied workMin is not implemented", NULL);

		return(TCL_ERROR);
	}

	nano_generate_work(blockhash, work, workMin);

	Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(work, sizeof(work)));

	return(TCL_OK);

	/* NOTREACH */
	clientData = clientData;
}

static int nano_tcl_self_test(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
	if (objc != 1) {
		Tcl_WrongNumArgs(interp, 1, objv, "");

		return(TCL_ERROR);
	}
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	Tcl_CreateObjCommand(interp, "::nano::internal::selfTest", nano_tcl_self_test, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::generateKey", nano_tcl_generate_keypair, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::generateSeed", nano_tcl_generate_seed, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::publicKey", nano_tcl_secret_key_to_public_key, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::signDetached", nano_tcl_sign_detached, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::verifyDetached", nano_tcl_verify_detached, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::hashData", nano_tcl_hash_data, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::validateWork", nano_tcl_validate_work, NULL, NULL);
	Tcl_CreateObjCommand(interp, "::nano::internal::generateWork", nano_tcl_generate_work, NULL, NULL);

	if (interp) {
		te_ret = Tcl_Eval(interp, nanoInitScript);
		if (te_ret != TCL_OK) {
			return(te_ret);
		}
	}
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