local function _read_data()
    -- 读数据
    read_list = {public_data = {}, private_data = {}}
    chainhelper:read_chain()
end

local function _save_data()
    -- 写数据
    read_list = {public_data = {}, private_data = {}}
    chainhelper:write_chain()
end

function init()
    assert(chainhelper:is_owner(), "#没有权限#")
    _read_data()
    assert(public_data.count == nil, "#游戏已经开始了#");
    public_data = {
        count = 0,
        timestamp = chainhelper:time(),
        countrys = {
            wei = {num = 0, price = 0},
            shu = {num = 0, price = 0},
            wu = {num = 0, price = 0}
        }
    }
    _save_data()
end

function Buy(arg_country, arg_num)
    -- 增兵
    _read_data()
    arg_num = math.floor(arg_num)
    if private_data.countrys == nil then 
        private_data.countrys ={
            wei = {num = 0, price = 0},
            shu = {num = 0, price = 0},
            wu = {num = 0, price = 0}
        }
    end
    local public_country = public_data.countrys[country]
    local private_country = private_data.countrys[country]
    if public_data.num ~= 0 then 
        public_country.price = public_country.price + num/public_country.num
    end
    if private_country.num == 0 then
        private_country.price = public_country.price
    else
        local sub_price = public_country.price - private_data.price
        local bonus_total = sub_price * private_country.num
        local proportion = bonus_total / (private_country.num + arg_num)
        local new_sub_price =  public_country.price - proportion
        private_data.price = new_sub_price
    end
    private_country.num = private_country.num + arg_num
    public_data.countrys[country].num = public_data.countrys[country].num + arg_num
    _save_data()
end

function Withdraw()
    -- 撤兵
end