local DataMgr = setmetatable({},{
    __index = function(t, key)
        return require("Datas."..key)
    end})
    

function DataMgr.Print_t ( t )
    -- print table
    local print_r_cache={}
    local function sub_print_r(t,indent)
        if (print_r_cache[tostring(t)]) then
            print(indent.."*"..tostring(t))
        else
            print_r_cache[tostring(t)]=true
            if (type(t)=="table") then
                for pos,val in pairs(t) do
                    if (type(val)=="table") then
                        print(indent.."["..pos.."] => "..tostring(t).." {")
                        sub_print_r(val,indent..string.rep(" ",string.len(pos)+8))
                        print(indent..string.rep(" ",string.len(pos)+6).."}")
                    elseif (type(val)=="string") then
                        print(indent.."["..pos..'] => "'..val..'"')
                    else
                        print(indent.."["..pos.."] => "..tostring(val))
                    end
                end
            else
                print(indent..tostring(t))
            end
        end
    end
    if (type(t)=="table") then
        print(tostring(t).." {")
        sub_print_r(t,"  ")
        print("}")
    else
        sub_print_r(t,"  ")
    end
    print()
end

function DataMgr.GetData(filename)
    local pro_path = UE4.UKismetSystemLibrary.GetProjectContentDirectory()
    local file = io.open(pro_path..'../Datas/'..filename .. '.json', "r")
    local info = file:read("*a")
    file:close()
    local json= require("rapidjson")
    local res = json.decode(info)
    return res
end

function DataMgr.GetLevelLoaderJsonData(shortname)
    local pro_path = UE4.UKismetSystemLibrary.GetProjectContentDirectory()
    local path=pro_path..'Script/Datas/Houdini_data/'..shortname .. '.json'
    local info = UE4.URuntimeCommonFunctionLibrary.LoadFile(path)
    -- local file = io.open(path, "r")
    -- local info = file:read("*a")
    -- file:close()
    local json= require("rapidjson")
    local res = json.decode(info)
    return res
end

-- 预加载数据表，将所有的数据表全部加载到内存中，减少之后读表index的时间消耗
function DataMgr.PreLoad()
    local DataNames = require("Datas.DataNames")
    for _, DataName in pairs(DataNames) do
        require("Datas."..DataName)
    end
end

local all_tables = {}

function DataMgr.CollectTable(Table)
    for k, tbl in pairs(all_tables) do
        if tbl == Table then
            all_tables[k] = nil
            for k, v in pairs(tbl) do
                if type(v) == "table" then
                    DataMgr.CollectTable(v)
                end
            end
            break
        end
    end
end

DataMgr.ReadOnly_NewIndex = function(t, k, v)
    local rawset = rawset
    local getmetatable = getmetatable
    error("没法对导表数据【" .. tostring(t.__name) .."】中字段【" .. tostring(k) .. "】进行写操作")
end

function DataMgr.CleanAllTable()
    all_tables = {}
    local DataNames = require("Datas.DataNames")
    local HotFix = require("HotFix")
    local data_module_table = rawget(HotFix, "data_module_table")
    for _, DataName in pairs(DataNames) do
        if not (data_module_table and data_module_table[DataName]) then
            require("UnLuaHotReload").RemoveLoadedModule("Datas."..DataName)
        end
    end
end
function read_only(name, tbl)
    if not all_tables[tbl] then
        local tbl_mt = getmetatable(tbl)
        if not tbl_mt then
            tbl_mt = {}
            setmetatable(tbl, tbl_mt)
        end

        local proxy = tbl_mt.__read_only_proxy
        if not proxy then
            proxy = {__name = name}
            tbl_mt.__read_only_proxy = proxy
            local proxy_mt = {
                __index = tbl,
                __newindex = DataMgr.ReadOnly_NewIndex,
                __pairs = function (t) return pairs(tbl) end,
                -- __ipairs = function (t) return ipairs(tbl) end,   5.3版本不需要此方法
                __len = function (t) return #tbl end,
                __read_only_proxy = proxy
            }
            setmetatable(proxy, proxy_mt)
        end
        all_tables[tbl] = proxy
        for k, v in pairs(tbl) do
            if type(v) == "table" then
                tbl[k] = read_only(name, v)
            end
        end
    end
    return all_tables[tbl]
end

--if URuntimeCommonFunctionLibrary.IsDebugDataTable() then
if true then
    DataMgr.ReadOnly = read_only
else
    DataMgr.ReadOnly = function (name, tbl) 
        return tbl 
    end
end
_G.DataMgr = DataMgr
return DataMgr