模块:Chinese calendar

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local p = {}

local function extract(num, pos, len)
    local shifted = math.floor(num / (2 ^ pos))
    local result = shifted % (2 ^ len)
    return result
end

-- 天干
local HEAVENLY_STEMS = { '甲', '乙', '丙', '丁', '戊', '己', '庚', '辛', '壬', '癸' }
-- 地支
local EARTHLY_BRANCHES = { '子', '丑', '寅', '卯', '辰', '巳', '午', '未', '申', '酉', '戌', '亥' }
-- 月份
local LUNAR_MONTHS = { '正', '二', '三', '四', '五', '六', '七', '八', '九', '十', '冬', '腊' }
-- 日期
local LUNAR_DAYS = {
    '初一', '初二', '初三', '初四', '初五', '初六', '初七', '初八', '初九', '初十',
    '十一', '十二', '十三', '十四', '十五', '十六', '十七', '十八', '十九', '二十',
    '廿一', '廿二', '廿三', '廿四', '廿五', '廿六', '廿七', '廿八', '廿九', '三十'
}

-- 农历数据 (1900-2100)
local LUNAR_INFO = {
    0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
    0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977,
    0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970,
    0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950,
    0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557,
    0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0,
    0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0,
    0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,
    0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570,
    0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0,
    0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5,
    0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930,
    0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,
    0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45,
    0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0
}

-- 节气数据（每个节气的日期偏移量）
local SOLAR_TERMS_OFFSET = {
    4, 19, 3, 18, 4, 19, 4, 19, 4, 20, 4, 20, 6, 22, 6, 22,
    6, 22, 7, 22, 6, 21, 6, 21
}

-- 节气名称
local SOLAR_TERMS = {
    '小寒', '大寒', '立春', '雨水', '惊蛰', '春分',
    '清明', '谷雨', '立夏', '小满', '芒种', '夏至',
    '小暑', '大暑', '立秋', '处暑', '白露', '秋分',
    '寒露', '霜降', '立冬', '小雪', '大雪', '冬至'
}

-- 检查日期是否合法
local function isValidDate(year, month, day)
    local days = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
    if (year % 4 == 0 and year % 100 ~= 0) or (year % 400 == 0) then
        days[2] = 29
    end
    return day <= days[month]
end

-- 计算指定公历日期是一年中的第几天
local function getDayOfYear(year, month, day)
    local days = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
    if (year % 4 == 0 and year % 100 ~= 0) or (year % 400 == 0) then
        days[2] = 29
    end

    local dayOfYear = day
    for i = 1, month - 1 do
        dayOfYear = dayOfYear + days[i]
    end
    return dayOfYear
end

-- 获取某年农历数据中的月份大小信息
local function getMonthSizes(lunarCode)
    local monthSizes = {}
    for i = 1, 12 do
        monthSizes[i] = extract(lunarCode, 12 - i, 1) == 1 and 30 or 29
    end
    return monthSizes
end

-- 获取闰月信息
local function getLeapMonth(lunarCode)
    return extract(lunarCode, 12, 4)
end

-- 获取春节日期
local function getSpringFestival(lunarCode)
    local month = extract(lunarCode, 16, 2) + 1
    local day = extract(lunarCode, 18, 5)
    return month, day
end

-- 计算节气
local function getSolarTerm(year, month, day)
    local baseYear = 1900
    local baseDay = 6        -- 1900年的小寒基准日
    local yearDays = 365.242 -- 回归年长度

    -- 计算与基准年份的差距
    local yearDiff = year - baseYear
    local termIndex = (month - 1) * 2

    -- 计算节气理论日期
    local theoreticalDay = math.floor(yearDiff * yearDays + baseDay + SOLAR_TERMS_OFFSET[termIndex + 1])

    -- 如果当前日期恰好是节气日期
    if day == theoreticalDay % 31 then
        return SOLAR_TERMS[termIndex + 1]
    end

    return nil
end

-- 计算农历日期
function calculateLunarDate(yearCode, year, month, day)
    -- 获取春节日期
    local sfMonth, sfDay = getSpringFestival(yearCode)

    -- 计算目标日期和春节的天数差
    local targetDayOfYear = getDayOfYear(year, month, day)
    local springFestivalDayOfYear = getDayOfYear(year, sfMonth, sfDay)
    local dayDiff = targetDayOfYear - springFestivalDayOfYear

    -- 如果在春节前，则属于上一个农历年
    if dayDiff < 0 then
        if year > 1900 then
            local prevYearCode = LUNAR_INFO[year - 1900]
            local prevMonthSizes = getMonthSizes(prevYearCode)
            local totalDays = dayDiff + prevMonthSizes[12]
            return 12, totalDays + 1, false, year - 1
        else
            return 12, 30 + dayDiff, false, year - 1
        end
    end

    -- 获取当年农历月份大小
    local monthSizes = getMonthSizes(yearCode)
    local leapMonth = getLeapMonth(yearCode)

    -- 计算农历月份和日期
    local days = dayDiff
    local lunarMonth = 1
    local isLeapMonth = false

    while days >= monthSizes[lunarMonth] do
        days = days - monthSizes[lunarMonth]

        if lunarMonth == leapMonth then
            if not isLeapMonth then
                isLeapMonth = true
                if days >= monthSizes[lunarMonth] then
                    days = days - monthSizes[lunarMonth]
                    lunarMonth = lunarMonth + 1
                end
            else
                lunarMonth = lunarMonth + 1
                isLeapMonth = false
            end
        else
            lunarMonth = lunarMonth + 1
        end

        if lunarMonth > 12 then
            return 1, days + 1, false, year + 1
        end
    end

    return lunarMonth, days + 1, isLeapMonth, year
end

-- 将公历日期转换为农历日期
function p.toLunar(frame)
    -- 获取输入参数
    local date = frame.args[1]
    local showSolarTerm = frame.args.showSolarTerm or false

    local year = tonumber(date:sub(1, 4))
    local month = tonumber(date:sub(6, 7))
    local day = tonumber(date:sub(9, 10))

    -- 输入范围验证
    if year < 1900 or year > 2100 then
        return '错误：年份超出范围(1900-2100)'
    end
    if month < 1 or month > 12 then
        return '错误：月份无效'
    end
    if not isValidDate(year, month, day) then
        return '错误：日期无效'
    end

    -- 计算农历年
    local yearCode = LUNAR_INFO[year - 1900 + 1]

    -- 计算农历月份和日期
    local lunarMonth, lunarDay, isLeapMonth, lunarYear = calculateLunarDate(yearCode, year, month, day)

    -- 获取天干地支
    local stemIndex = (lunarYear - 4) % 10
    local branchIndex = (lunarYear - 4) % 12

    -- 构造输出字符串
    local result = HEAVENLY_STEMS[stemIndex + 1] .. EARTHLY_BRANCHES[branchIndex + 1] .. '年'
    if isLeapMonth then
        result = result .. '闰'
    end
    result = result .. LUNAR_MONTHS[lunarMonth] .. '月' .. LUNAR_DAYS[lunarDay]

    -- 如果需要显示节气
    if showSolarTerm then
        local solarTerm = getSolarTerm(year, month, day)
        if solarTerm then
            result = result .. ' （' .. solarTerm .. '）'
        end
    end

    return result
end

return p