// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Copyright (c) 2017-2019 The Sheet Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

/**
 * Server/client environment: argument handling, config file parsing,
 * logging, thread wrappers, startup time
 */
#ifndef SHEET_UTIL_H
#define SHEET_UTIL_H

#if defined(HAVE_CONFIG_H)
#include "config/sheet-config.h"
#endif

#include "compat.h"
#include "fs.h"
#include "sync.h"
#include "tinyformat.h"
#include "utiltime.h"

#include <atomic>
#include <exception>
#include <map>
#include <stdint.h>
#include <string>
#include <vector>

#include <boost/signals2/signal.hpp>

// Application startup time (used for uptime calculation)
int64_t GetStartupTime();

static const bool DEFAULT_LOGTIMEMICROS = false;
static const bool DEFAULT_LOGIPS        = false;
static const bool DEFAULT_LOGTIMESTAMPS = true;

/** Signals for translation. */
class CTranslationInterface
{
public:
    /** Translate a message to the native language of the user. */
    boost::signals2::signal<std::string(const char *psz)> Translate;
};

extern bool fPrintToConsole;
extern bool fPrintToDebugLog;

extern bool fLogTimestamps;
extern bool fLogTimeMicros;
extern bool fLogIPs;
extern std::atomic<bool> fReopenDebugLog;
extern CTranslationInterface translationInterface;

extern const char *const SHEET_CONF_FILENAME;
extern const char *const SHEET_PID_FILENAME;

extern std::atomic<uint32_t> logCategories;

/**
 * Translation function: Call Translate signal on UI interface, which returns a boost::optional result.
 * If no translation slot is registered, nothing is returned, and simply return the input.
 */
inline std::string _(const char *psz)
{
    boost::optional<std::string> rv = translationInterface.Translate(psz);
    return rv ? (*rv) : psz;
}

void SetupEnvironment();

bool SetupNetworking();

struct CLogCategoryActive
{
    std::string category;
    bool active;
};

namespace BCLog
{
    enum LogFlags : uint32_t
    {
        NONE = 0,
        NET = (1 << 0),
        TOR = (1 << 1),
        MEMPOOL = (1 << 2),
        HTTP = (1 << 3),
        BENCH = (1 << 4),
        ZMQ = (1 << 5),
        DB = (1 << 6),
        RPC = (1 << 7),
        ESTIMATEFEE = (1 << 8),
        ADDRMAN = (1 << 9),
        SELECTCOINS = (1 << 10),
        REINDEX = (1 << 11),
        CMPCTBLOCK = (1 << 12),
        RAND = (1 << 13),
        PRUNE = (1 << 14),
        PROXY = (1 << 15),
        MEMPOOLREJ = (1 << 16),
        LIBEVENT = (1 << 17),
        COINDB = (1 << 18),
        QT = (1 << 19),
        LEVELDB = (1 << 20),
        REWARDS = (1 << 21),
        ALL = ~(uint32_t) 0,
    };
}

/** Return true if log accepts specified category */
static inline bool LogAcceptCategory(uint32_t category)
{
    return (logCategories.load(std::memory_order_relaxed) & category) != 0;
}

/** Returns a string with the log categories. */
std::string ListLogCategories();

/** Returns a vector of the active log categories. */
std::vector<CLogCategoryActive> ListActiveLogCategories();

/** Return true if str parses as a log category and set the flags in f */
bool GetLogCategory(uint32_t *f, const std::string *str);

/** Send a string to the log output */
int LogPrintStr(const std::string &str);

/** Get format string from VA_ARGS for error reporting */
template<typename... Args>
std::string FormatStringFromLogArgs(const char *fmt, const Args &... args)
{ return fmt; }

static inline void MarkUsed()
{}

template<typename T, typename... Args>
static inline void MarkUsed(const T &t, const Args &... args)
{
    (void) t;
    MarkUsed(args...);
}

#ifdef USE_COVERAGE
#define LogPrintf(...) do { MarkUsed(__VA_ARGS__); } while(0)
#define LogPrint(category, ...) do { MarkUsed(__VA_ARGS__); } while(0)
#else
#define LogPrintf(...) do { \
    std::string _log_msg_; /* Unlikely name to avoid shadowing variables */ \
    try { \
        _log_msg_ = tfm::format(__VA_ARGS__); \
    } catch (tinyformat::format_error &fmterr) { \
        /* Original format string will have newline so don't add one here */ \
        _log_msg_ = "Error \"" + std::string(fmterr.what()) + "\" while formatting log message: " + FormatStringFromLogArgs(__VA_ARGS__); \
    } \
    LogPrintStr(_log_msg_); \
} while(0)

#define LogPrint(category, ...) do { \
    if (LogAcceptCategory((category))) { \
        LogPrintf(__VA_ARGS__); \
    } \
} while(0)
#endif

template<typename... Args>
bool error(const char *fmt, const Args &... args)
{
    LogPrintStr("ERROR: " + tfm::format(fmt, args...) + "\n");
    return false;
}

void PrintExceptionContinue(const std::exception *pex, const char *pszThread);

void FileCommit(FILE *file);

bool TruncateFile(FILE *file, unsigned int length);

int RaiseFileDescriptorLimit(int nMinFD);

void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length);

bool RenameOver(fs::path src, fs::path dest);

bool TryCreateDirectories(const fs::path &p);

fs::path GetDefaultDataDir();

const fs::path &GetDataDir(bool fNetSpecific = true);

void ClearDatadirCache();

fs::path GetConfigFile(const std::string &confPath);

#ifndef WIN32

fs::path GetPidFile();

void CreatePidFile(const fs::path &path, pid_t pid);

#endif
#ifdef WIN32
fs::path GetSpecialFolderPath(int nFolder, bool fCreate = true);
#endif

void OpenDebugLog();

void ShrinkDebugFile();

void runCommand(const std::string &strCommand);

inline bool IsSwitchChar(char c)
{
#ifdef WIN32
    return c == '-' || c == '/';
#else
    return c == '-';
#endif
}

class ArgsManager
{
protected:
    mutable CCriticalSection cs_args;
    std::map<std::string, std::string> mapArgs;
    std::map<std::string, std::vector<std::string>> mapMultiArgs;
public:
    void ParseParameters(int argc, const char *const argv[]);

    void ReadConfigFile(const std::string &confPath);

    /**
     * Return a vector of strings of the given argument
     *
     * @param strArg Argument to get (e.g. "-foo")
     * @return command-line arguments
     */
    std::vector<std::string> GetArgs(const std::string &strArg) const;

    /**
     * Return true if the given argument has been manually set
     *
     * @param strArg Argument to get (e.g. "-foo")
     * @return true if the argument has been set
     */
    bool IsArgSet(const std::string &strArg) const;

    /**
     * Return string argument or default value
     *
     * @param strArg Argument to get (e.g. "-foo")
     * @param strDefault (e.g. "1")
     * @return command-line argument or default value
     */
    std::string GetArg(const std::string &strArg, const std::string &strDefault) const;

    /**
     * Return integer argument or default value
     *
     * @param strArg Argument to get (e.g. "-foo")
     * @param nDefault (e.g. 1)
     * @return command-line argument (0 if invalid number) or default value
     */
    int64_t GetArg(const std::string &strArg, int64_t nDefault) const;

    /**
     * Return boolean argument or default value
     *
     * @param strArg Argument to get (e.g. "-foo")
     * @param fDefault (true or false)
     * @return command-line argument or default value
     */
    bool GetBoolArg(const std::string &strArg, bool fDefault) const;

    /**
     * Set an argument if it doesn't already have a value
     *
     * @param strArg Argument to set (e.g. "-foo")
     * @param strValue Value (e.g. "1")
     * @return true if argument gets set, false if it already had a value
     */
    bool SoftSetArg(const std::string &strArg, const std::string &strValue);

    /**
     * Set a boolean argument if it doesn't already have a value
     *
     * @param strArg Argument to set (e.g. "-foo")
     * @param fValue Value (e.g. false)
     * @return true if argument gets set, false if it already had a value
     */
    bool SoftSetBoolArg(const std::string &strArg, bool fValue);

    // Forces an arg setting. Called by SoftSetArg() if the arg hasn't already
    // been set. Also called directly in testing.
    void ForceSetArg(const std::string &strArg, const std::string &strValue);

    void ForceSetArg(const std::string &strArg, const int64_t &nValue);
};

extern ArgsManager gArgs;

/**
 * Format a string to be used as group of options in help messages
 *
 * @param message Group name (e.g. "RPC server options:")
 * @return the formatted string
 */
std::string HelpMessageGroup(const std::string &message);

/**
 * Format a string to be used as option description in help messages
 *
 * @param option Option message (e.g. "-rpcuser=<user>")
 * @param message Option description (e.g. "Username for JSON-RPC connections")
 * @return the formatted string
 */
std::string HelpMessageOpt(const std::string &option, const std::string &message);

/**
 * Return the number of physical cores available on the current system.
 * @note This does not count virtual cores, such as those provided by HyperThreading
 * when boost is newer than 1.56.
 */
int GetNumCores();

void RenameThread(const char *name);

/**
 * .. and a wrapper that just calls func once
 */
template<typename Callable>
void TraceThread(const char *name, Callable func)
{
    std::string s = strprintf("sheet-%s", name);
    RenameThread(s.c_str());
    try
    {
        LogPrintf("%s thread start\n", name);
        func();
        LogPrintf("%s thread exit\n", name);
    }
    catch (const boost::thread_interrupted &)
    {
        LogPrintf("%s thread interrupt\n", name);
        throw;
    }
    catch (const std::exception &e)
    {
        PrintExceptionContinue(&e, name);
        throw;
    }
    catch (...)
    {
        PrintExceptionContinue(nullptr, name);
        throw;
    }
}

std::string CopyrightHolders(const std::string &strPrefix);

void SetThreadPriority(int nPriority);

#endif // SHEET_UTIL_H
