/*
 * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Affero 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 Affero 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/>.
 */

#include "Util.h"
#include "Common.h"
#include "Containers.h"
#include "IpAddress.h"
#include "StringConvert.h"
#include "Tokenize.h"
#include <algorithm>
#include <boost/core/demangle.hpp>
#include <cctype>
#include <cstdarg>
#include <sstream>
#include <string>
#include <utf8.h>

void stripLineInvisibleChars(std::string& str)
{
    static std::string const invChars = " \t\7\n";

    std::size_t wpos = 0;

    bool space = false;
    for (std::size_t pos = 0; pos < str.size(); ++pos)
    {
        if (invChars.find(str[pos]) != std::string::npos)
        {
            if (!space)
            {
                str[wpos++] = ' ';
                space = true;
            }
        }
        else
        {
            if (wpos != pos)
            {
                str[wpos++] = str[pos];
            }
            else
            {
                ++wpos;
            }
            space = false;
        }
    }

    if (wpos < str.size())
    {
        str.erase(wpos, str.size());
    }
    if (str.find("|TInterface") != std::string::npos)
    {
        str.clear();
    }
}

std::string secsToTimeString(uint64 timeInSecs, bool shortText)
{
    uint64 secs    = timeInSecs % MINUTE;
    uint64 minutes = timeInSecs % HOUR / MINUTE;
    uint64 hours   = timeInSecs % DAY  / HOUR;
    uint64 days    = timeInSecs / DAY;

    std::ostringstream ss;
    if (days)
    {
        ss << days << (shortText ? "d" : " day(s) ");
    }
    if (hours)
    {
        ss << hours << (shortText ? "h" : " hour(s) ");
    }
    if (minutes)
    {
        ss << minutes << (shortText ? "m" : " minute(s) ");
    }
    if (secs || (!days && !hours && !minutes) )
    {
        ss << secs << (shortText ? "s" : " second(s) ");
    }

    std::string str = ss.str();

    if (!shortText && !str.empty() && str[str.size() - 1] == ' ')
    {
        str.resize(str.size() - 1);
    }

    return str;
}

Optional<int32> MoneyStringToMoney(std::string_view moneyString)
{
    int32 money = 0;

    bool hadG = false;
    bool hadS = false;
    bool hadC = false;

    for (std::string_view token : Acore::Tokenize(moneyString, ' ', false))
    {
        uint32 unit;
        switch (token[token.length() - 1])
        {
        case 'g':
            if (hadG)
            {
                return std::nullopt;
            }
            hadG = true;
            unit = 100 * 100;
            break;
        case 's':
            if (hadS)
            {
                return std::nullopt;
            }
            hadS = true;
            unit = 100;
            break;
        case 'c':
            if (hadC)
            {
                return std::nullopt;
            }
            hadC = true;
            unit = 1;
            break;
        default:
            return std::nullopt;
        }

        Optional<uint32> amount = Acore::StringTo<uint32>(token.substr(0, token.length() - 1));
        if (amount)
        {
            money += (unit * *amount);
        }
        else
        {
            return std::nullopt;
        }
    }

    return money;
}

uint32 TimeStringToSecs(const std::string& timestring)
{
    uint32 secs       = 0;
    uint32 buffer     = 0;
    uint32 multiplier = 0;

    for (std::string::const_iterator itr = timestring.begin(); itr != timestring.end(); ++itr)
    {
        if (isdigit(*itr))
        {
            buffer *= 10;
            buffer += (*itr) - '0';
        }
        else
        {
            switch (*itr)
            {
                case 'd':
                    multiplier = DAY;
                    break;
                case 'h':
                    multiplier = HOUR;
                    break;
                case 'm':
                    multiplier = MINUTE;
                    break;
                case 's':
                    multiplier = 1;
                    break;
                default :
                    return 0;                         //bad format
            }
            buffer *= multiplier;
            secs += buffer;
            buffer = 0;
        }
    }

    return secs;
}

/// Check if the string is a valid ip address representation
bool IsIPAddress(char const* ipaddress)
{
    if (!ipaddress)
    {
        return false;
    }

    boost::system::error_code error;
    Acore::Net::make_address(ipaddress, error);
    return !error;
}

/// create PID file
uint32 CreatePIDFile(std::string const& filename)
{
    FILE* pid_file = fopen(filename.c_str(), "w");
    if (!pid_file)
    {
        return 0;
    }

    uint32 pid = GetPID();

    fprintf(pid_file, "%u", pid);
    fclose(pid_file);

    return pid;
}

uint32 GetPID()
{
#ifdef _WIN32
    DWORD pid = GetCurrentProcessId();
#else
    pid_t pid = getpid();
#endif

    return uint32(pid);
}

std::size_t utf8length(std::string& utf8str)
{
    try
    {
        return utf8::distance(utf8str.c_str(), utf8str.c_str() + utf8str.size());
    }
    catch (std::exception const&)
    {
        utf8str.clear();
        return 0;
    }
}

void utf8truncate(std::string& utf8str, std::size_t len)
{
    try
    {
        std::size_t wlen = utf8::distance(utf8str.c_str(), utf8str.c_str() + utf8str.size());
        if (wlen <= len)
        {
            return;
        }

        std::wstring wstr;
        wstr.resize(wlen);
        utf8::utf8to16(utf8str.c_str(), utf8str.c_str() + utf8str.size(), &wstr[0]);
        wstr.resize(len);
        char* oend = utf8::utf16to8(wstr.c_str(), wstr.c_str() + wstr.size(), &utf8str[0]);
        utf8str.resize(oend - (&utf8str[0]));               // remove unused tail
    }
    catch (std::exception const&)
    {
        utf8str.clear();
    }
}

bool Utf8toWStr(char const* utf8str, std::size_t csize, wchar_t* wstr, std::size_t& wsize)
{
    try
    {
        Acore::CheckedBufferOutputIterator<wchar_t> out(wstr, wsize);
        out = utf8::utf8to16(utf8str, utf8str + csize, out);
        wsize -= out.remaining(); // remaining unused space
        wstr[wsize] = L'\0';
    }
    catch (std::exception const&)
    {
        // Replace the converted string with an error message if there is enough space
        // Otherwise just return an empty string
        const wchar_t* errorMessage = L"An error occurred converting string from UTF-8 to WStr";
        std::size_t errorMessageLength = std::char_traits<wchar_t>::length(errorMessage);
        if (wsize >= errorMessageLength)
        {
            std::wcscpy(wstr, errorMessage);
            wsize = std::char_traits<wchar_t>::length(wstr);
        }
        else if (wsize > 0)
        {
            wstr[0] = L'\0';
            wsize = 0;
        }
        else
        {
            wsize = 0;
        }

        return false;
    }

    return true;
}

bool Utf8toWStr(std::string_view utf8str, std::wstring& wstr)
{
    wstr.clear();
    try
    {
        utf8::utf8to16(utf8str.begin(), utf8str.end(), std::back_inserter(wstr));
    }
    catch (std::exception const&)
    {
        wstr.clear();
        return false;
    }

    return true;
}

bool WStrToUtf8(wchar_t const* wstr, std::size_t size, std::string& utf8str)
{
    try
    {
        std::string utf8str2;
        utf8str2.resize(size * 4);                            // allocate for most long case

        if (size)
        {
            char* oend = utf8::utf16to8(wstr, wstr + size, &utf8str2[0]);
            utf8str2.resize(oend - (&utf8str2[0]));               // remove unused tail
        }

        utf8str = utf8str2;
    }
    catch (std::exception const&)
    {
        utf8str.clear();
        return false;
    }

    return true;
}

bool WStrToUtf8(std::wstring_view wstr, std::string& utf8str)
{
    try
    {
        std::string utf8str2;
        utf8str2.resize(wstr.size() * 4);                     // allocate for most long case

        if (!wstr.empty())
        {
            char* oend = utf8::utf16to8(wstr.begin(), wstr.end(), &utf8str2[0]);
            utf8str2.resize(oend - (&utf8str2[0]));                // remove unused tail
        }

        utf8str = utf8str2;
    }
    catch (std::exception const&)
    {
        utf8str.clear();
        return false;
    }

    return true;
}

void wstrToUpper(std::wstring& str) { std::transform(std::begin(str), std::end(str), std::begin(str), wcharToUpper); }
void wstrToLower(std::wstring& str) { std::transform(std::begin(str), std::end(str), std::begin(str), wcharToLower); }
void strToUpper(std::string& str) { std::transform(std::begin(str), std::end(str), std::begin(str), charToUpper); }
void strToLower(std::string& str) { std::transform(std::begin(str), std::end(str), std::begin(str), charToLower); }

std::wstring GetMainPartOfName(std::wstring const& wname, uint32_t declension)
{
    // supported only Cyrillic cases
    if (wname.empty() || !isCyrillicCharacter(wname[0]) || declension > 5)
    {
        return wname;
    }

    // Important: end length must be <= MAX_INTERNAL_PLAYER_NAME-MAX_PLAYER_NAME (3 currently)
    static std::wstring const a_End    = L"\u0430";
    static std::wstring const o_End    = L"\u043E";
    static std::wstring const ya_End   = L"\u044F";
    static std::wstring const ie_End   = L"\u0435";
    static std::wstring const i_End    = L"\u0438";
    static std::wstring const yeru_End = L"\u044B";
    static std::wstring const u_End    = L"\u0443";
    static std::wstring const yu_End   = L"\u044E";
    static std::wstring const oj_End   = L"\u043E\u0439";
    static std::wstring const ie_j_End = L"\u0435\u0439";
    static std::wstring const io_j_End = L"\u0451\u0439";
    static std::wstring const o_m_End  = L"\u043E\u043C";
    static std::wstring const io_m_End = L"\u0451\u043C";
    static std::wstring const ie_m_End = L"\u0435\u043C";
    static std::wstring const soft_End = L"\u044C";
    static std::wstring const j_End    = L"\u0439";

    static std::array<std::array<std::wstring const*, 7>, 6> const dropEnds = {{
            { &a_End,  &o_End,    &ya_End,   &ie_End,  &soft_End, &j_End,    nullptr },
            { &a_End,  &ya_End,   &yeru_End, &i_End,   nullptr,   nullptr,   nullptr },
            { &ie_End, &u_End,    &yu_End,   &i_End,   nullptr,   nullptr,   nullptr },
            { &u_End,  &yu_End,   &o_End,    &ie_End,  &soft_End, &ya_End,   &a_End  },
            { &oj_End, &io_j_End, &ie_j_End, &o_m_End, &io_m_End, &ie_m_End, &yu_End },
            { &ie_End, &i_End,    nullptr,   nullptr,  nullptr,   nullptr,   nullptr }
        }
    };

    std::size_t const thisLen = wname.length();
    std::array<std::wstring const*, 7> const& endings = dropEnds[declension];
    for (const std::wstring* endingPtr : endings)
    {
        if (endingPtr == nullptr)
        {
            break;
        }

        std::wstring const& ending = *endingPtr;
        std::size_t const endLen = ending.length();
        if (endLen > thisLen)
        {
            continue;
        }

        if (wname.compare(thisLen - endLen, endLen, ending) == 0)
        {
            return wname.substr(0, thisLen - endLen);
        }
    }

    return wname;
}

bool utf8ToConsole(std::string_view utf8str, std::string& conStr)
{
#if AC_PLATFORM == AC_PLATFORM_WINDOWS
    std::wstring wstr;
    if (!Utf8toWStr(utf8str, wstr))
    {
        return false;
    }

    conStr.resize(wstr.size());
    CharToOemBuffW(&wstr[0], &conStr[0], wstr.size());
#else
    // not implemented yet
    conStr = utf8str;
#endif

    return true;
}

bool consoleToUtf8(std::string_view conStr, std::string& utf8str)
{
#if AC_PLATFORM == AC_PLATFORM_WINDOWS
    std::wstring wstr;
    wstr.resize(conStr.size());
    OemToCharBuffW(&conStr[0], &wstr[0], uint32(conStr.size()));

    return WStrToUtf8(wstr, utf8str);
#else
    // not implemented yet
    utf8str = conStr;
    return true;
#endif
}

bool Utf8FitTo(std::string_view str, std::wstring_view search)
{
    std::wstring temp;

    if (!Utf8toWStr(str, temp))
    {
        return false;
    }

    // converting to lower case
    wstrToLower(temp);

    if (temp.find(search) == std::wstring::npos)
    {
        return false;
    }

    return true;
}

void utf8printf(FILE* out, const char* str, ...)
{
    va_list ap;
    va_start(ap, str);
    vutf8printf(out, str, &ap);
    va_end(ap);
}

void vutf8printf(FILE* out, const char* str, va_list* ap)
{
#if AC_PLATFORM == AC_PLATFORM_WINDOWS
    char temp_buf[32 * 1024];
    wchar_t wtemp_buf[32 * 1024];

    std::size_t temp_len = vsnprintf(temp_buf, 32 * 1024, str, *ap);
    //vsnprintf returns -1 if the buffer is too small
    if (temp_len == std::size_t(-1))
    {
        temp_len = 32 * 1024 - 1;
    }

    std::size_t wtemp_len = 32 * 1024 - 1;
    Utf8toWStr(temp_buf, temp_len, wtemp_buf, wtemp_len);

    CharToOemBuffW(&wtemp_buf[0], &temp_buf[0], uint32(wtemp_len + 1));
    fprintf(out, "%s", temp_buf);
#else
    vfprintf(out, str, *ap);
#endif
}

bool Utf8ToUpperOnlyLatin(std::string& utf8String)
{
    std::wstring wstr;
    if (!Utf8toWStr(utf8String, wstr))
    {
        return false;
    }

    std::transform(wstr.begin(), wstr.end(), wstr.begin(), wcharToUpperOnlyLatin);

    return WStrToUtf8(wstr, utf8String);
}

std::string Acore::Impl::ByteArrayToHexStr(uint8 const* bytes, std::size_t arrayLen, bool reverse /* = false */)
{
    int32 init = 0;
    int32 end = arrayLen;
    int8 op = 1;

    if (reverse)
    {
        init = arrayLen - 1;
        end = -1;
        op = -1;
    }

    std::ostringstream ss;
    for (int32 i = init; i != end; i += op)
    {
        char buffer[4];
        snprintf(buffer, sizeof(buffer), "%02X", bytes[i]);
        ss << buffer;
    }

    return ss.str();
}

void Acore::Impl::HexStrToByteArray(std::string_view str, uint8* out, std::size_t outlen, bool reverse /*= false*/)
{
    ASSERT(str.size() == (2 * outlen));

    int32 init = 0;
    int32 end = int32(str.length());
    int8 op = 1;

    if (reverse)
    {
        init = int32(str.length() - 2);
        end = -2;
        op = -1;
    }

    uint32 j = 0;
    for (int32 i = init; i != end; i += 2 * op)
    {
        char buffer[3] = { str[i], str[i + 1], '\0' };
        out[j++] = uint8(strtoul(buffer, nullptr, 16));
    }
}

bool StringEqualI(std::string_view a, std::string_view b)
{
    return std::equal(a.begin(), a.end(), b.begin(), b.end(), [](char c1, char c2) { return std::tolower(c1) == std::tolower(c2); });
}

bool StringContainsStringI(std::string_view haystack, std::string_view needle)
{
    return haystack.end() !=
        std::search(haystack.begin(), haystack.end(), needle.begin(), needle.end(), [](char c1, char c2) { return std::tolower(c1) == std::tolower(c2); });
}

bool StringCompareLessI(std::string_view a, std::string_view b)
{
    return std::lexicographical_compare(a.begin(), a.end(), b.begin(), b.end(), [](char c1, char c2) { return std::tolower(c1) < std::tolower(c2); });
}

std::string GetTypeName(std::type_info const& info)
{
    return boost::core::demangle(info.name());
}