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/*
 *
 * Copyright (C) 2022 Jeremias Stotter <jeremias@stotter.eu>
 *
 * This file is part of network-simulator.
 *
 * network-simulator is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * network-simulator is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with network-simulator. If not, see <https://www.gnu.org/licenses/>. 
*/

// This file will contain various functions that might be helpfull for the lua devices / interfaces

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <stdarg.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#include <lua.h>
#include <lauxlib.h>
#include <json.h>

#include "lua_functions.h"
#include "helpers.h"
#include "shared.h"
#include "template.h"

uint32_t crctable[256];

int lua_error_handler(lua_State* vm) {
	if(lua_tostring(vm, -1)) {
		luaL_traceback(vm, vm, NULL, 0);
		fprintf(stderr, "%s; %s\n", lua_tostring(vm, -2), lua_tostring(vm, -1));
	}
	return 1;
}

// takes variadic arguments in the pattern lua type, argument, lua_type, argument, ...
// The argument list should look like this:
// TYPE, argument, TYPE, argument, -1
// strings need 3 arguments like this:
// LUA_TSTRING, len, string
int my_lua_call(lua_State* vm, char* func_name, int nres, ...) {
		if(!lua_getglobal(vm, func_name) || !lua_isfunction(vm, -1)) {
			//fprintf(stderr, "%s doesn't seam to be a lua function\n", func_name);
			lua_pop(vm, 1);
			return 0;
		}

		va_list ptr;

		va_start(ptr, nres);

		int cont = 1;
		int nargs;
		for(nargs = 0; cont; nargs++) {
			int type = va_arg(ptr, int);
			switch(type) {
				case LUA_TNIL:
					lua_pushnil(vm);
					va_arg(ptr, void*);
					break;
				case LUA_TNUMBER:;
					int num = va_arg(ptr, int);
					lua_pushinteger(vm, num);
					break;
				case LUA_TBOOLEAN:
					lua_pushboolean(vm, va_arg(ptr, int));
					break;
				case LUA_TSTRING:
					{
						size_t len = va_arg(ptr, size_t);
						lua_pushlstring(vm, va_arg(ptr, char*), len);
					}
					break;
				case -1:
					cont = 0;
					// Decrease nargs by one so that we get the right ammount
					nargs--;
					break;
				default:
					fprintf(stderr, "my_lua_call: Unrecognized type %d in va_arg %d\n", type, nargs);
					va_end(ptr);
					return 0;
			}
		}
		va_end(ptr);
		lua_pushcfunction(vm, lua_error_handler);
		lua_insert(vm, 1);
		if(lua_pcall(vm, nargs, nres, /*handler_location*/ 1) != 0) {
			fprintf(stderr, "Error calling %s\n", func_name);
			return 0;
		}
		lua_remove(vm, 1);
		return 1;
}

char* string_to_numeric(const char* in, const size_t len) {
	char* out = malloc_or_abort(len*2+2);
	*out = 's';
	char* c = out+1;
	for(int i = 0; i < len; i++) {
		snprintf(c,3,"%02hhX",in[i]);
		c+= 2;
	}
	return out;
}

char* numeric_to_string(char* in, size_t* len) {
	size_t out_len = (strlen(in)-1)/2;
	if(len) *len = out_len;
	char* out = malloc(out_len);
	char* c = out;
	// Skip the initial s
	in++;
	while(*in != '\0') {
		char hex[3] = {0};
		memcpy(hex, in, 2);
		int matched = sscanf(hex, "%02hhX", c);
		if(!matched) return out;
		in+=2;
		c++;
	}
	return out;
}

// Turn the table at index into a json object
json_object* table_to_json(lua_State* lua_vm, int index) {
	json_object* return_obj = json_object_new_object();
	int start_top = lua_gettop(lua_vm);
	// first key
	lua_pushnil(lua_vm);
 	char numeric_index[25] = "";
	while(lua_next(lua_vm, index)) {
		const char* t_index = NULL;
		int need_free = 0;
		switch(lua_type(lua_vm, -2)) {
			// keys will either start with an s for string, an i for integer or a f for float
			case LUA_TNUMBER:
				if(lua_isinteger(lua_vm, -2)) {
				    snprintf(numeric_index, 20, "i%lld", lua_tointeger(lua_vm, -2));
					t_index = numeric_index;
				} else {
				    snprintf(numeric_index, 20, "f%lf", lua_tonumber(lua_vm, -2));
					t_index = numeric_index;
				}
				break;
			case LUA_TSTRING:
				{
					size_t lua_index_s;
					const char* lua_index = lua_tolstring(lua_vm, -2, &lua_index_s);
					// Replace any instances of "\0" with "%0" because json_c needs it
					t_index = string_to_numeric(lua_index, lua_index_s);
					need_free = 1;
				}
				break;
		}
		json_object* subobj = NULL;
		switch(lua_type(lua_vm, -1)) {
			case LUA_TSTRING:
				{
					size_t strlen = 0;
					const char* lua_string = lua_tolstring(lua_vm, -1, &strlen);
					subobj = json_object_new_string_len(lua_string, strlen);
				}
				break;
			case LUA_TNUMBER:
				if(lua_isinteger(lua_vm, -1))
					subobj = json_object_new_int64(lua_tointeger(lua_vm, -1));
				else
					subobj = json_object_new_double(lua_tonumber(lua_vm, -1));
				break;
			case LUA_TBOOLEAN:
				subobj = json_object_new_boolean(lua_toboolean(lua_vm, -1));
				break;
			case LUA_TTABLE:
				subobj = table_to_json(lua_vm, lua_gettop(lua_vm));
				break;
			case LUA_TNIL:
			default:
				subobj = json_object_new_null();
				break;
				
		}
		json_object_object_add_ex(return_obj, t_index, subobj, JSON_C_TO_STRING_NOSLASHESCAPE);
		lua_pop(lua_vm, 1);
		if(need_free) free((char*)t_index);
	}
	// Return the stack to its former state
	lua_settop(lua_vm, start_top);
	return return_obj;
}

// Takes a single table as an argument, returns its representation as a json string
int lua_table_to_json(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "table_to_json requires one argument\n");
		return 0;
	}
	json_object* return_obj = table_to_json(lua_vm, 1);
	lua_pushstring(lua_vm, json_object_to_json_string_ext(return_obj, 0));
	json_object_put(return_obj);
	return 1;
}

void table_from_json(lua_State* lua_vm, json_object* in_obj) {
		lua_newtable(lua_vm);
	json_object_iter iter = {0};
	json_object_object_foreachC(in_obj, iter) {
		// Do the index
		switch(iter.key[0]) {
			case 's':
				{
					size_t key_len = 0;
					char* key = numeric_to_string(iter.key, &key_len);
					lua_pushlstring(lua_vm, key, key_len);
					free(key);
				}
				break;
			case 'i':
				{
					int key = 0;
					sscanf(iter.key+1, "%d", &key);
					lua_pushinteger(lua_vm, key);
				}
				break;
			case 'f':
				{
					double key = 0;
					sscanf(iter.key+1, "%lf", &key);
					lua_pushnumber(lua_vm, key);
				}
				break;
			default:
				lua_pushstring(lua_vm, iter.key);
		}
		// Do the value
		switch(json_object_get_type(iter.val)) {
			case json_type_null:
				lua_pushnil(lua_vm);
				break;
			case json_type_boolean:
				lua_pushboolean(lua_vm, json_object_get_boolean(iter.val));
				break;
			case json_type_double:
				lua_pushnumber(lua_vm, json_object_get_double(iter.val));
				break;
			case json_type_int:
				lua_pushinteger(lua_vm, json_object_get_int64(iter.val));
				break;
			case json_type_object:
				table_from_json(lua_vm, iter.val);
				break;
			case json_type_string:
				lua_pushlstring(lua_vm, json_object_get_string(iter.val), json_object_get_string_len(iter.val));
				break;
			case json_type_array:
				lua_pushnil(lua_vm);
				break;
		}
		lua_settable(lua_vm, -3);
	}
}

int lua_table_from_json(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "table_from_json requires one argument\n");
		return 0;
	}
	const char* in_str = lua_tostring(lua_vm, 1);
	json_object* in_obj = json_tokener_parse(in_str);
	if(!in_obj || json_object_get_type(in_obj) != json_type_object) {
		fprintf(stderr, "Couldn't parse json or is of wrong type: %s\n", in_str);
		return 0;
	}
	table_from_json(lua_vm, in_obj);
	return 1;
}

// This takes a single ip address represented as a string and returns its integer representation
int lua_parse_ip(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "parse_ip requires one argument\n");
		return 0;
	}
	const char* string_addr = lua_tostring(lua_vm, 1);
	if(string_addr == NULL) {
		fprintf(stderr, "Address lua_tostring failed\n");
		return 0;
	}
	char bin_addr[4];
	if(!inet_pton(AF_INET, string_addr, bin_addr)) {
		fprintf(stderr, "Could not parse ip address %s\n", string_addr);
		return 0;
	}

	lua_pushlstring(lua_vm, bin_addr, 4);
	return 1;
}

int lua_ip_to_string(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "ip_to_string requires one argument\n");
		return 0;
	}
	size_t addrlen = 0;
	const char* addr_lua = lua_tolstring(lua_vm, 1, &addrlen);
	if(addrlen != 4) {
		fprintf(stderr, "The address needs to be 4 bytes long");
		return 0;
	}
	char addr_string[16];
	sprintf(addr_string, "%hhu.%hhu.%hhu.%hhu", addr_lua[0], addr_lua[1], addr_lua[2], addr_lua[3]);
	lua_pushstring(lua_vm, addr_string);
	return 1;
}

// This takes a string as a single argument. It will then return the hex representation of the bytes in the string
int lua_bin_to_hex(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "Wrong arguments passed to bin_to_hex");
		return 0;
	}
	size_t string_size = 0;
	const char* string = lua_tolstring(lua_vm, 1, &string_size);

	char* hexstring = malloc_or_abort(string_size * 2 + 1);
	for(int i = 0; i < string_size; i++) {
		sprintf(hexstring+(i*2), "%02X", (unsigned char)string[i]);
	}
	lua_pushlstring(lua_vm, (const char*)hexstring, string_size * 2);
	free(hexstring);
	return 1;
}

// This lua function takes one argument, which is the length of a random string that this function will return
int lua_getrandom_bytes(lua_State* lua_vm) {
	// Argument count
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "Wrong arguments passed to getrandom");
		return 0;
	}
	// Initialize the buffer for the random bytes
	int n_bytes = lua_tointeger(lua_vm, 1);
	unsigned char* rand_buffer = malloc_or_abort(n_bytes);
	for(int i = 0; i < n_bytes; i++) {
		rand_buffer[i] = rand() % UCHAR_MAX;
	}
	
	// Return random bytes
	lua_pushlstring(lua_vm, (char*)rand_buffer, n_bytes);
	free(rand_buffer);

	return 1;
}


uint32_t calc_fcs(const char* data, int data_len) {
	uint32_t crc32sum = 0xFFFFFFFFL;
	for(int i = 0; i < data_len; i++) {
		crc32sum = (crc32sum << 8) ^ crctable[((crc32sum >> 24) ^ data[i]) % 0xFF];
	}
	return ~(crc32sum);
}

int lua_calc_fcs(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 2) {
		fprintf(stderr, "Wrong arguments passed to calc_fcs\n");
		return 0;
	}

	// Get the arguments
	const char* input = lua_tolstring(lua_vm, 1, NULL);
	int input_len = lua_tointeger(lua_vm, 2);

	// Calculate the FCS
	uint32_t fcs = calc_fcs(input, input_len);
	// Return the result
	// Return it as a string because lua doesnt ensure its numbers are actually 32 bit
	lua_pushlstring(lua_vm, (char*)&fcs, 4);

	return 1;
}

char* my_strsep(char **stringp, const char* delimit) {
	if(!*stringp) return NULL;
	char* end = strstr(*stringp, delimit);
	char* start = *stringp;
	if(end) {
		char* past = end + strlen(delimit);
		*end = '\0';
		*stringp = past;
	} else {
		*stringp = NULL;
	}
	return start;
}

// Takes two arguments, a string and another string, splits the first string at any occurence of the second string, removing the occurence in the process
// Uses strtok
int lua_string_tok(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 2) {
		fprintf(stderr, "Wrong arguments passed to string_tok\n");
		return 0;
	}

	// Get the two arguments
	const char* lua_str = lua_tolstring(lua_vm, 1, NULL);
	const char* delimit = lua_tolstring(lua_vm, 2, NULL);

	// split the string
	char* string = malloc_or_abort(strlen(lua_str) + 1);
	strcpy(string, lua_str);
	lua_newtable(lua_vm);
	int i = 1;
	char* next_string = string;
	
	for(char* token = my_strsep(&next_string, delimit); token; token = my_strsep(&next_string, delimit)) {
		lua_pushstring(lua_vm, token);
		lua_seti(lua_vm, -2, i);
		i++;
	}
	free(string);
	return 1;
}

int lua_get_timestamp(lua_State* lua_vm) {
	lua_pushinteger(lua_vm, timestamp);
	return 1;
}

int lua_in_cksum(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "in_cksum expects 1 argument\n");
		return 0;
	}
	size_t len = 0;
	const char* in = lua_tolstring(lua_vm, 1, &len);

	union {
		char c[2];
		uint32_t i;
	} sum = {.i = 0xFFFF};

	for(size_t i = 0; i+1 < len; i+=2) {
		uint16_t word = *((uint16_t*)(&in[i]));
		sum.i += word;
		// If we need to carry, decrement
		if(sum.i > 0xFFFF) {
			sum.i-= 0xFFFF;
		}
	}

	if(len % 2) {
		char word = in[len -1];
		sum.c[0] += word;
		if(sum.i > 0xFFFF) {
			sum.i-= 0xFFFF;
		}		
	}
	lua_pushlstring(lua_vm, sum.c, 2);
	
	return 1;
}

// This function will take 3 arguments, one address and its subnet and a second address
// It will return true if they are in the same subnet and false if they are not
int lua_check_subnet(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 3) {
		fprintf(stderr, "check_subnet expects 3 arguments\n");
		return 0;
	}
	size_t len = 0;
	const uint32_t* addr1 = (const uint32_t*)lua_tolstring(lua_vm, 1, &len);
	if(len != 4) {
		fprintf(stderr, "Address 1 needs to be 4 bytes long\n");
		return 0;
	}
	int mask_bits = lua_tointeger(lua_vm, 2);
	uint32_t netmask = ~(0xFFFFFFFF >> (mask_bits));
	const uint32_t* addr2 = (const uint32_t*)lua_tolstring(lua_vm, 3, &len);
	if(len != 4) {
		fprintf(stderr, "Address 2 needs to be 4 bytes long\n");
		return 0;
	}
	// To check if we are in the same subnet we can just check if the network part of the address is the same
	lua_pushboolean(lua_vm, (ntohl(*addr1) & netmask) == (ntohl(*addr2) & netmask));
	return 1;
}

// This will load a library template
int lua_ns_openlib(lua_State* lua_vm) {
	int largc = lua_gettop(lua_vm);
	if(largc != 1) {
		fprintf(stderr, "ns_openlib expects 1 argument\n");
		return 0;
	}
	const char* libname = lua_tostring(lua_vm, 1);
	for(int i = 0; i < lib_template_n; i++) {
		if(strcmp(libname, lib_templates[i].name))
			continue;
		if(luaL_dofile(lua_vm, lib_templates[i].lua_file) != LUA_OK) {
			fprintf(stderr, "ns_openlib error: %s\n", lua_tostring(lua_vm, -1));
		}
		return 0;
	}
	fprintf(stderr, "couldn't find template %s\n", libname);
	return 0;
}

void register_lua_helpers(lua_State* lua_vm) {
	lua_register(lua_vm, "getrandom", lua_getrandom_bytes);
	lua_register(lua_vm, "calc_fcs", lua_calc_fcs);
	lua_register(lua_vm, "bin_to_hex", lua_bin_to_hex);
	lua_register(lua_vm, "parse_ip", lua_parse_ip);
	lua_register(lua_vm, "ip_to_string", lua_ip_to_string);
	lua_register(lua_vm, "string_tok", lua_string_tok);
	lua_register(lua_vm, "table_to_json", lua_table_to_json);
	lua_register(lua_vm, "table_from_json", lua_table_from_json);
	lua_register(lua_vm, "get_timestamp", lua_get_timestamp);
	lua_register(lua_vm, "in_cksum", lua_in_cksum);
	lua_register(lua_vm, "check_subnet", lua_check_subnet);
	lua_register(lua_vm, "ns_openlib", lua_ns_openlib);
}

uint32_t crctable[256] = {
	0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b, 0x1a864db2,
	0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, 0x350c9b64, 0x31cd86d3,
	0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
	0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
	0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e,
	0x95609039, 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
	0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d, 0xd4326d90,
	0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
	0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a,
	0xec7dd02d, 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c,
	0x2e003dc5, 0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13,
	0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
	0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
	0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, 0xaca5c697, 0xa864db20,
	0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f,
	0x8e6c3698, 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
	0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055,
	0xfef34de2, 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
	0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, 0x7a089632,
	0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
	0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629, 0x2c9f00f0,
	0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91,
	0x0a97ed48, 0x0e56f0ff, 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
	0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
	0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604,
	0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2, 0xaafbe615,
	0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, 0x8832161a,
	0x8cf30bad, 0x81b02d74, 0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
	0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f,
	0x76c15bf8, 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
	0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, 0x3793a651,
	0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
	0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
	0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa,
	0xf9278673, 0xfde69bc4, 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5,
	0x9e7d9662, 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
	0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};
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