【框架设计】坐骑系统：碎片合成与品质保底

---坐骑合成：碎片集齐兑换
local MOUNTS = {
    { name = "赤兔马",   shards = 50, speed = 30, quality = 3 },
    { name = "白泽",     shards = 80, speed = 35, quality = 4 },
    { name = "墨麒麟",   shards = 120, speed = 40, quality = 5 },
}

function Mount.compose(actor, mountId)
    local player = class(actor)
    if not player then return false end
    local cfg = MOUNTS[mountId]
    if not checkitemw(actor, cfg.name .. "碎片", cfg.shards) then
        sendmsg(actor, 1, "碎片不足，还差 " ..
            (cfg.shards - checkitemw2(actor, cfg.name .. "碎片")))
        return false
    end
    takeitem(actor, cfg.name .. "碎片", cfg.shards, 0, "坐骑合成")
    giveitem(actor, cfg.name, 1)
    QF_Broadcast(player:GetName() .. " 合成了 " ..
        cfg.name .. "！")
    return true
end

---保底：抽取的碎片保底计数
function Mount.drawPity(actor, quality)
    local pity = tonumber(getplayvar(actor, 2,
        "MountPity_" .. quality)) or 0
    pity = pity + 1
    if pity >= 60 then
        setplayvar(actor, "HUMAN",
            "MountPity_" .. quality, 0, 1)
        giveitem(actor, MOUNTS[quality].name .. "碎片", 20)
        sendmsg(actor, 1, "保底触发：碎片 x20 已发放")
    else
        setplayvar(actor, "HUMAN",
            "MountPity_" .. quality, pity, 1)
    end
end