/*
 Copyright (C) 2017-2020 Fredrik Öhrström

 This program 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.

 This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef UTIL_H
#define UTIL_H

#include<signal.h>
#include<stdint.h>
#include<string>
#include<functional>
#include<map>
#include<vector>

void onExit(std::function<void()> cb);
void restoreSignalHandlers();
bool gotHupped();
void wakeMeUpOnSigChld(pthread_t t);
bool signalsInstalled();

typedef unsigned char uchar;

#define call(A,B) ([&](){A->B();})
#define calll(A,B,T) ([&](T t){A->B(t);})

uchar bcd2bin(uchar c);
uchar revbcd2bin(uchar c);
uchar reverse(uchar c);

bool isHexChar(uchar c);

bool isHexString(const char* txt, bool *invalid);
bool isHexString(const std::string &txt, bool *invalid);
bool hex2bin(const char* src, std::vector<uchar> *target);
bool hex2bin(std::string &src, std::vector<uchar> *target);
bool hex2bin(std::vector<uchar> &src, std::vector<uchar> *target);
std::string bin2hex(const std::vector<uchar> &target);
std::string bin2hex(std::vector<uchar>::iterator data, std::vector<uchar>::iterator end, int len);
std::string bin2hex(std::vector<uchar> &data, int offset, int len);
std::string safeString(std::vector<uchar> &target);
void strprintf(std::string &s, const char* fmt, ...);
std::string tostrprintf(const char* fmt, ...);

// Return for example: 2010-03-21
std::string strdate(struct tm *date);
// Return for example: 2010-03-21 15:22
std::string strdatetime(struct tm *date);
// Return for example: 2010-03-21 15:22:03
std::string strdatetimesec(struct tm *date);
void addMonths(struct tm* date, int m);

bool stringFoundCaseIgnored(std::string haystack, std::string needle);

void xorit(uchar *srca, uchar *srcb, uchar *dest, int len);
void shiftLeft(uchar *srca, uchar *srcb, int len);
std::string format3fdot3f(double v);
bool enableLogfile(std::string logfile, bool daemon);
void disableLogfile();
void enableSyslog();
void error(const char* fmt, ...);
void verbose(const char* fmt, ...);
void trace(const char* fmt, ...);
void debug(const char* fmt, ...);
void warning(const char* fmt, ...);
void info(const char* fmt, ...);
void notice(const char* fmt, ...);
void notice_timestamp(const char* fmt, ...);

void silentLogging(bool b);
void verboseEnabled(bool b);
void debugEnabled(bool b);
void traceEnabled(bool b);

enum class AddLogTimestamps
{
    NotSet, Never, Always, Important
};

void setLogTimestamps(AddLogTimestamps ts);
void stderrEnabled(bool b);
void logTelegramsEnabled(bool b);
void internalTestingEnabled(bool b);
bool isInternalTestingEnabled();

bool isVerboseEnabled();
bool isDebugEnabled();
bool isLogTelegramsEnabled();

void debugPayload(std::string intro, std::vector<uchar> &payload);
void debugPayload(std::string intro, std::vector<uchar> &payload, std::vector<uchar>::iterator &pos);
void logTelegram(std::vector<uchar> &original, std::vector<uchar> &parsed, int header_size, int suffix_size);

enum class Alarm
{
    DeviceFailure,
    RegularResetFailure,
    DeviceInactivity,
    SpecifiedDeviceNotFound
};

const char* toString(Alarm type);
void logAlarm(Alarm type, std::string info);
void setAlarmShells(std::vector<std::string> &alarm_shells);

bool isValidAlias(std::string alias);
bool isValidBps(std::string b);
bool isValidMatchExpression(std::string id, bool non_compliant);
bool isValidMatchExpressions(std::string ids, bool non_compliant);
bool doesIdMatchExpression(std::string id, std::string match_rule);
bool doesIdMatchExpressions(std::string id, std::vector<std::string>& match_rules, bool *used_wildcard);
bool doesIdsMatchExpressions(std::vector<std::string> &ids, std::vector<std::string>& match_rules, bool *used_wildcard);
std::string toIdsCommaSeparated(std::vector<std::string> &ids);

bool isValidId(std::string id, bool accept_non_compliant);

bool isFrequency(std::string& fq);
bool isNumber(std::string& fq);

std::vector<std::string> splitMatchExpressions(std::string& mes);
std::vector<std::string> splitString(std::string &s, char c);

void incrementIV(uchar *iv, size_t len);

bool checkCharacterDeviceExists(const char *tty, bool fail_if_not);
bool checkFileExists(const char *file);
bool checkIfSimulationFile(const char *file);
bool checkIfDirExists(const char *dir);
bool listFiles(std::string dir, std::vector<std::string> *files);
int loadFile(std::string file, std::vector<std::string> *lines);
bool loadFile(std::string file, std::vector<char> *buf);

std::string eatTo(std::vector<uchar> &v, std::vector<uchar>::iterator &i, int c, size_t max, bool *eof, bool *err);

void padWithZeroesTo(std::vector<uchar> *content, size_t len, std::vector<uchar> *full_content);
std::string padLeft(std::string input, int width);

// Parse text string into seconds, 5h = (3600*5) 2m = (60*2) 1s = 1
int parseTime(std::string time);

// Test if current time is inside any of the specified periods.
// For example: mon-sun(00-24) is always true!
//              mon-fri(08-20) is true monday to friday from 08.00 to 19.59
//              tue(09-10),sat(00-24) is true tuesday 09.00 to 09.59 and whole of saturday.
bool isInsideTimePeriod(time_t now, std::string periods);
bool isValidTimePeriod(std::string periods);

uint16_t crc16_EN13757(uchar *data, size_t len);

// This crc is used by im871a for its serial communication.
uint16_t crc16_CCITT(uchar *data, uint16_t length);
bool     crc16_CCITT_check(uchar *data, uint16_t length);

// Eat characters from the vector v, iterating using i, until the end char c is found.
// If end char == -1, then do not expect any end char, get all until eof.
// If the end char is not found, return error.
// If the maximum length is reached without finding the end char, return error.
std::string eatTo(std::vector<char> &v, std::vector<char>::iterator &i, int c, size_t max, bool *eof, bool *err);
// Eat whitespace (space and tab, not end of lines).
void eatWhitespace(std::vector<char> &v, std::vector<char>::iterator &i, bool *eof);
// First eat whitespace, then start eating until c is found or eof. The found string is trimmed from beginning and ending whitespace.
std::string eatToSkipWhitespace(std::vector<char> &v, std::vector<char>::iterator &i, int c, size_t max, bool *eof, bool *err);
// Remove leading and trailing white space
void trimWhitespace(std::string *s);
// Returns AccessOK if device exists and is accessible.
// NotSameGroup means that there is no permission and the groups do not match.
// NoPermission means some other reason for no access. (missing rw etc)
// Locked means that some other process has locked the tty.
// NoSuchDevice means the tty does not exist.
// NoProperResponse means that we talked to something, but we do not know what it is.
enum class AccessCheck { NoSuchDevice, NoProperResponse, NoPermission, NotSameGroup, AccessOK };
const char* toString(AccessCheck ac);
AccessCheck checkIfExistsAndHasAccess(std::string device);
// Count the number of 1:s in the binary number v.
int countSetBits(int v);

bool startsWith(std::string &s, const char *prefix);
bool startsWith(std::string &s, std::string &prefix);

// Given alfa=beta it returns "alfa":"beta"
std::string makeQuotedJson(std::string &s);

std::string currentYear();
std::string currentDay();
std::string currentHour();
std::string currentMinute();
std::string currentSeconds();
std::string currentMicros();

#define CHECK(n) if (!hasBytes(n, pos, frame)) return expectedMore(__LINE__);

bool hasBytes(int n, std::vector<uchar>::iterator &pos, std::vector<uchar> &frame);

bool startsWith(std::string s, std::vector<uchar> &data);

// Sum the memory used by the heap and stack.
size_t memoryUsage();

std::string humanReadableTwoDecimals(size_t s);

uint32_t indexFromRtlSdrName(std::string &s);

bool check_if_rtlwmbus_exists_in_path();
bool check_if_rtlsdr_exists_in_path();

// Return the actual executable binary that is running.
std::string currentProcessExe();

std::string dirname(std::string p);

std::string lookForExecutable(std::string prog, std::string bin_dir, std::string default_dir);

// Extract from "ppm=5 radix=7" and put key values into map.
bool parseExtras(std::string s, std::map<std::string,std::string> *extras);
void checkIfMultipleWmbusMetersRunning();

size_t findBytes(std::vector<uchar> &v, uchar a, uchar b, uchar c);

#ifndef FUZZING
#define FUZZING false
#endif

#endif