Core/Calendar: Implement different timezone support for ingame calendar

Closes #8390
Closes #29427

src/server/game/Time/WowTime.cpp

@@ -0,0 +1,219 @@
+/*
+ * This file is part of the TrinityCore 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 General Public License as published by the
+ * Free Software Foundation; either version 2 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/>.
+ */
+
+#include "WowTime.h"
+#include "ByteBuffer.h"
+#include "Errors.h"
+#include "Util.h"
+
+uint32 WowTime::GetPackedTime() const
+{
+    return ((_year % 100) & 0x1F) << 24
+        | (_month & 0xF) << 20
+        | (_monthDay & 0x3F) << 14
+        | (_weekDay & 0x7) << 11
+        | (_hour & 0x1F) << 6
+        | (_minute & 0x3F)
+        | (_flags & 0x3) << 29;
+}
+
+void WowTime::SetPackedTime(uint32 packedTime)
+{
+    _year = (packedTime >> 24) & 0x1F;
+    if (_year == 31)
+        _year = -1;
+
+    _month = (packedTime >> 20) & 0xF;
+    if (_month == 15)
+        _month = -1;
+
+    _monthDay = (packedTime >> 14) & 0x3F;
+    if (_monthDay == 63)
+        _monthDay = -1;
+
+    _weekDay = (packedTime >> 11) & 0x7;
+    if (_weekDay == 7)
+        _weekDay = -1;
+
+    _hour = (packedTime >> 6) & 0x1F;
+    if (_hour == 31)
+        _hour = -1;
+
+    _minute = packedTime & 0x3F;
+    if (_minute == 63)
+        _minute = -1;
+
+    _flags = (packedTime >> 29) & 0x3;
+    if (_flags == 3)
+        _flags = -1;
+}
+
+std::time_t WowTime::GetUnixTimeFromUtcTime() const
+{
+    if (_year < 0 || _month < 0 || _monthDay < 0)
+        return 0;
+
+    std::tm buf{};
+    buf.tm_year = _year + 100;
+    buf.tm_mon = _month;
+    buf.tm_mday = _monthDay + 1;
+    if (_hour >= 0)
+    {
+        buf.tm_hour = _hour;
+        if (_minute >= 0)
+            buf.tm_min = _minute;
+    }
+    buf.tm_isdst = -1;
+    buf.tm_wday = _weekDay;
+
+    return timegm(&buf);
+}
+
+void WowTime::SetUtcTimeFromUnixTime(std::time_t unixTime)
+{
+    std::tm buf;
+    if (!::gmtime_r(&unixTime, &buf))
+        return;
+
+    _year = (buf.tm_year - 100) % 100;
+    _month = buf.tm_mon;
+    _monthDay = buf.tm_mday - 1;
+    _weekDay = buf.tm_wday;
+    _hour = buf.tm_hour;
+    _minute = buf.tm_min;
+}
+
+void WowTime::SetYear(int32 year)
+{
+    ASSERT(year == -1 || (year >= 0 && year < 32));
+    _year = year;
+}
+
+void WowTime::SetMonth(int8 month)
+{
+    ASSERT(month == -1 || (month >= 0 && month < 12));
+    _month = month;
+}
+
+void WowTime::SetMonthDay(int8 monthDay)
+{
+    ASSERT(monthDay == -1 || (monthDay >= 0 && monthDay < 32));
+    _monthDay = monthDay;
+}
+
+void WowTime::SetWeekDay(int8 weekDay)
+{
+    ASSERT(weekDay == -1 || (weekDay >= 0 && weekDay < 7));
+    _weekDay = weekDay;
+}
+
+void WowTime::SetHour(int8 hour)
+{
+    ASSERT(hour == -1 || (hour >= 0 && hour < 24));
+    _hour = hour;
+}
+
+void WowTime::SetMinute(int8 minute)
+{
+    ASSERT(minute == -1 || (minute >= 0 && minute < 60));
+    _minute = minute;
+}
+
+void WowTime::SetFlags(int8 flags)
+{
+    ASSERT(flags == -1 || (flags >= 0 && flags < 3));
+    _flags = flags;
+}
+
+std::strong_ordering operator<=>(WowTime const& left, WowTime const& right)
+{
+    auto compareFieldIfSet = [&]<typename T>(T WowTime::*field) -> std::strong_ordering
+    {
+        if (left.*field < 0 || right.*field < 0)
+            return std::strong_ordering::equal;
+
+        return left.*field <=> right.*field;
+    };
+
+    if (std::strong_ordering cmp = compareFieldIfSet(&WowTime::_year); advstd::is_neq(cmp))
+        return cmp;
+
+    if (std::strong_ordering cmp = compareFieldIfSet(&WowTime::_month); advstd::is_neq(cmp))
+        return cmp;
+
+    if (std::strong_ordering cmp = compareFieldIfSet(&WowTime::_monthDay); advstd::is_neq(cmp))
+        return cmp;
+
+    if (std::strong_ordering cmp = compareFieldIfSet(&WowTime::_weekDay); advstd::is_neq(cmp))
+        return cmp;
+
+    if (std::strong_ordering cmp = compareFieldIfSet(&WowTime::_year); advstd::is_neq(cmp))
+        return cmp;
+
+    if (std::strong_ordering cmp = compareFieldIfSet(&WowTime::_hour); advstd::is_neq(cmp))
+        return cmp;
+
+    return std::strong_ordering::equal;
+}
+
+bool WowTime::IsInRange(WowTime const& from, WowTime const& to) const
+{
+    if (from > to)
+        return *this >= from || *this < to;
+
+    return *this >= from && *this < to;
+}
+
+WowTime& WowTime::operator+=(Seconds seconds)
+{
+    time_t unixTime = GetUnixTimeFromUtcTime();
+    unixTime += seconds.count();
+    SetUtcTimeFromUnixTime(unixTime);
+    return *this;
+}
+
+WowTime WowTime::operator+(Seconds seconds) const
+{
+    return WowTime(*this) += seconds;
+}
+
+WowTime& WowTime::operator-=(Seconds seconds)
+{
+    time_t unixTime = GetUnixTimeFromUtcTime();
+    unixTime -= seconds.count();
+    SetUtcTimeFromUnixTime(unixTime);
+    return *this;
+}
+
+WowTime WowTime::operator-(Seconds seconds) const
+{
+    return WowTime(*this) -= seconds;
+}
+
+ByteBuffer& operator<<(ByteBuffer& data, WowTime const& wowTime)
+{
+    data << uint32(wowTime.GetPackedTime());
+    return data;
+}
+
+ByteBuffer& operator>>(ByteBuffer& data, WowTime& wowTime)
+{
+    uint32 packedTime = 0;
+    data >> packedTime;
+    wowTime.SetPackedTime(packedTime);
+    return data;
+}