【进阶实战】箭塔守御：固定炮台的索敌与开火封装

local function towerPick(targets)
    local best, bestDist = nil, math.huge
    for _, t in ipairs(targets) do
        if t.dist < bestDist
            or (t.dist == bestDist and t.hp < best.hp) then
            best, bestDist = t, t.dist
        end
    end
    return best
end

local function towerFire(actor, target)
    local hp = tonumber(getplayvar(target, 0, "HP")) or 0
    setplayvar(target, 0, "HP", hp - 300, 0)
    sendmsg(target, 1, "箭塔命中，受到 300 点伤害。")
    if hp - 300 <= 0 then
        sendmsg(actor, 1, "箭塔击退一名入侵者。")
    end
end