【进阶实战】排行榜预览：提交前预估名次与差距展示封装

local function previewRank(actor, myPts)
    actor = getplayerbyname(actor)
    local board = tostring(getsysvar("WarPtsBoard") or "")
    local higher, closestAbove = 0, nil
    for e in string.gmatch(board, "[^|]+") do
        local pts = tonumber(string.match(e, ":(%d+)$") or "0")
        if pts > myPts then
            higher = higher + 1
            if closestAbove == nil or pts < closestAbove then
                closestAbove = pts
            end
        end
    end
    local rank = higher + 1
    local gap = closestAbove and (closestAbove - myPts) or 0
    sendmsg(actor, 1, "预计第 " .. rank .. " 名，距前一名差 " .. gap .. " 分。")
    return rank, gap
end

local REWARDS = { { min = 1, desc = "金条x5+限定称号" }, { min = 10, desc = "金条x2" }, { min = 50, desc = "金创药x5" } }
local function showRewardPreview(actor, rank)
    actor = getplayerbyname(actor)
    for _, r in ipairs(REWARDS) do
        if rank <= r.min then
            sendmsg(actor, 1, "第 " .. r.min .. " 名内可获得：" .. r.desc)
            return
        end
    end
    sendmsg(actor, 1, "当前名次暂无奖励，继续加油！")
end