DateOBJ = {}
DateOBJ.__cname = "DateOBJ"
DateOBJ.__index = DateOBJ


---获取明天0点时间
---@param days number 默认为明天 从今天起算
---@param now number 现在时间戳 不是必传
function DateOBJ.getTomorrowZero(days, now)
    days = days or 1;
    now = now or os.time()
    local nextTime = os.date("*t", now + (86400 * days))
    nextTime.hour = 0
    nextTime.min = 0
    nextTime.sec = 0
    return os.time(nextTime);
end

---获取今天00点的字符串格式化时间
function DateOBJ.getTodayZero(now)
    now = now or os.time();
    local nextTime = os.date("*t", now)
    nextTime.hour = 0
    nextTime.min = 0
    nextTime.sec = 0
    return os.time(nextTime);
end

---获取本周指定周几0点时间如果小于等于当前周几自动滑到下周
---@param week number 1-7 周一-周日
function DateOBJ.getAutoWeekZero(week)
    week = week or 1;
    local now = os.time();
    local w = tonumber(os.date("%w", now));
    if w == 0 then w = 7 end
    if week <= w then
        week = week + 7
    end
    return DateOBJ.getTomorrowZero((week - w), now);
end

---获取本周指定周几0点时间
---@param week number 1-7 周一-周日
function DateOBJ.getWeekZero(week)
    week = week or 1;
    local now = os.time();
    local w = tonumber(os.date("%w", now));
    if w == 0 then w = 7 end
    return DateOBJ.getTomorrowZero((week - w), now);
end

---获取下周指定周几0点时间
---@param week number 1-7 周一-周日
function DateOBJ.getNextWeekZero(week)
    week = week or 1;
    local now = os.time();
    local w = tonumber(os.date("%w", now));
    if w == 0 then w = 7 end
    return DateOBJ.getTomorrowZero((week - w) + 7, now);
end

---获取月指定时间(精确版, 包括闰月计算)
---@param day number 指定当月的第几天
---@param now number 当前时间戳，默认为当前时间
function DateOBJ.getMonthZero(day, now)
    day = day or 1
    now = now or os.time()
    local monTime = os.date("*t", now)

    -- 获取当前月份的天数
    local function getDaysInMonth(year, month)
        if month == 2 then
            -- 闰年判断：能被4整除且不能被100整除，或者能被400整除
            if (year % 4 == 0 and year % 100 ~= 0) or (year % 400 == 0) then
                return 29
            else
                return 28
            end
        end
        -- 大月31天，小月30天
        local daysInMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
        return daysInMonth[month]
    end

    -- 确保指定的天数在当前月份的范围内
    local daysInCurrentMonth = getDaysInMonth(monTime.year, monTime.month)
    if day > daysInCurrentMonth then
        day = daysInCurrentMonth
    elseif day < 1 then
        day = 1
    end

    monTime.day = day
    monTime.hour = 0
    monTime.min = 0
    monTime.sec = 0
    return os.time(monTime)
end

---获取下月指定时间(精确版, 包括闰月计算)
---@param day number 指定下月的第几天
---@param now number 当前时间戳，默认为当前时间
function DateOBJ.getNextMonthZero(day, now)
    day = day or 1
    now = now or os.time()
    local monTime = os.date("*t", now)

    -- 获取下个月的月份和年份
    monTime.month = monTime.month + 1
    if monTime.month > 12 then
        monTime.month = 1
        monTime.year = monTime.year + 1
    end

    -- 获取当前月份的天数
    local function getDaysInMonth(year, month)
        if month == 2 then
            -- 闰年判断：能被4整除且不能被100整除，或者能被400整除
            if (year % 4 == 0 and year % 100 ~= 0) or (year % 400 == 0) then
                return 29
            else
                return 28
            end
        end
        -- 大月31天，小月30天
        local daysInMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
        return daysInMonth[month]
    end

    -- 确保指定的天数在下个月的范围内
    local daysInNextMonth = getDaysInMonth(monTime.year, monTime.month)
    if day > daysInNextMonth then
        day = daysInNextMonth
    elseif day < 1 then
        day = 1
    end

    monTime.day = day
    monTime.hour = 0
    monTime.min = 0
    monTime.sec = 0
    return os.time(monTime)
end

---获取准确的年月日的时间戳
---@param year number 年份
---@param month number 月份
---@param day number 天
---@param hour? number 小时
---@param min? number 分钟
---@param sec? number 秒
function DateOBJ.getDateZero(year, month, day, hour, min, sec)
    year = year or os.date("%Y")
    month = month or os.date("%m")
    day = day or os.date("%d")
    hour = hour or 0
    min = min or 0
    sec = sec or 0

    -- 确保月份在1-12之间
    if month < 1 then month = 1 end
    if month > 12 then month = 12 end

    -- 确保天数在1-31之间
    if day < 1 then day = 1 end
    if day > 31 then day = 31 end

    local dateTable = {
        year = year,
        month = month,
        day = day,
        hour = hour,
        min = min,
        sec = sec
    }
    return os.time(dateTable)
end

return DateOBJ