local ModelBase = class("ModelBase")
  ModelBase.key = "key"

  ModelBase.schema = {}

  
  local string_format = string.format
  local table_insert = table.insert
  local table_unpack = table.unpack
  local assert = assert
  local next = next
  local ipairs = ipairs
  local pairs = pairs
  local tostring = tostring
  local tonumber = tonumber
  local redisproxy = redisproxy
  
  local function filterProperties(properties, filter)
      for i, field in ipairs(filter) do
          properties[field] = nil
      end
  end
  
  function ModelBase:ctor(properties)
      self.isModelBase_ = true

      self.cacheFields = {} --缓存字段 不更新数据库的字段
  
      self[self.class.key .. "_"] = properties[self.class.key] --数据库key
      properties[self.class.key] = nil
  
      if not self:isValidKey() then
          print(string_format("%s [%s:key] should be give in new(ctor)", tostring(self), self.class.__cname))
          return 
      end

  
      if type(properties) ~= "table" then properties = {} end
      self:setProperties(properties, true)  --缺少的域将设置默认值
  end
  

  -- startCache 和 endCache 在恰当的时候配对使用
  function ModelBase:startCache( ... )
      for _, field in ipairs({ ... }) do
          if self.class.schema[field] then
              self.cacheFields[field] = true
          end
      end
  end
  
  function ModelBase:endCache( ... )
      args = { ... }
      params = {}
  
      function doOneCache(field)
          local propname = field .. "_"
          table_insert(params, field)
          if self.class.schema[fieldName][1] == "table" then
              table_insert(params, MsgPack.pack(self[propname]))
          else
              table_insert(params, self[propname])
          end
      end
  
      if not next(args) then
          for field, _ in pairs(self.cacheFields) do
              doOneCache(field)
          end
          self.cacheFields = {}
      else
          for _, field in ipairs(args) do
              if self.cacheFields[field] then
                  self.cacheFields[field] = nil
                  doOneCache(field)
              end
          end
      end
  
      if next(params) then
          redisproxy:hmset(self:getKey(), table_unpack(params))
      end
  end

  --[[--
  
  返回对象的 ID 值。
  
  **Returns:**
  
  -   ID 值
  
  ]]
  function ModelBase:getKey()
      local id = self[self.class.key .. "_"]
      assert(id ~= nil, string_format("%s [%s:getKey()] Invalid key", tostring(self), self.class.__cname))
      return id
  end
  
  function ModelBase:load(properties)
      if not self:isValidKey() then
          print(string_format("%s [%s:id] should be set before load", tostring(self), self.class.__cname))
          return false
      end
  
      if not properties then
          properties = redisproxy:hgetall(self:getKey())

          properties = table.arrayToMap(properties)

      end

      if not next(properties) then return false end
  
      self:setProperties(properties, true)
  
      self:onLoad()
  
      return true
  end
  
  --创建model对应的redis数据, 必须已经设置了ID
  function ModelBase:create()
      if not self:isValidKey() then
          print(string_format("%s [%s:key] should be set before create", tostring(self), self.class.__cname))
          return nil
      end
  

      self:save()
      self:onCreate()
  
      return self
  end

  -- save 忽略 缓存配置

  function ModelBase:save()
      local redisProperties = self:getProperties()
  
      local params = {}
      for fieldName, value in pairs(redisProperties) do

          local propname = fieldName .. "_"
          table_insert(params, fieldName)
          if self.class.schema[fieldName][1] == "table" then
              table_insert(params, MsgPack.pack(self[propname]))
          else

              table_insert(params, self[propname])

          end

      end
      if next(params) then
          redisproxy:hmset(self:getKey(), table_unpack(params))
      end
  end
  
  --[[--
  
  确定对象是否设置了有效的 key。
  
  ]]
  function ModelBase:isValidKey()
      local propname = self.class.key .. "_"
      local key = self[propname]
      return type(key) == "string" and key ~= ""
  end
  
  --[[--
  
  修改对象的属性。
  NOTE: 如果properties缺少schema中的域, 将用默认值来填充
  
  **Parameters:**
  
  -   properties: 包含属性值的数组
  
  ]]
  function ModelBase:setProperties(properties, notWrite)
      assert(type(properties) == "table", "Invalid properties")
             -- string_format("%s [%s:setProperties()] Invalid properties", tostring(self), self.class.__cname))
  
      local params = {}
      for field, schema in pairs(self.class.schema) do
          local typ, def = table_unpack(schema)
          local propname = field .. "_"
  

          if typ == "table" and type(properties[field]) == "string" then
              properties[field] = MsgPack.unpack(properties[field])
          end
  

          local val = properties[field] or def
          if val ~= nil then
              if typ == "number" then val = tonumber(val) end
              assert(type(val) == typ,
                 string_format("%s [%s:setProperties()] Type mismatch, %s expected %s, actual is %s",
                                   tostring(self), self.class.__cname, field, typ, type(val)))
              self[propname] = val

              if not self.cacheFields[field] then
                  table_insert(params, field)
                  if typ == "table" then
                      val = MsgPack.pack(val)
                  end
                  table_insert(params, val)
              end

          end
      end
      if not notWrite and next(params) then
          redisproxy:hmset(self:getKey(), table_unpack(params))
      end
  end
  
  --[[--
  
  取得对象的属性值。
  
  **Parameters:**
  
  -   fields: 要取得哪些属性的值，如果未指定该参数，则返回 fields 中设定的属性
  -   filter: 要从结果中过滤掉哪些属性，如果未指定则不过滤
  
  **Returns:**
  
  -   包含属性值的数组
  
  ]]
  function ModelBase:getProperties(fields, filter)
      local schema = self.class.schema

      if type(fields) ~= "table" then fields = table.keys(self.class.schema) end

  
      local properties = {}
      for i, field in ipairs(fields) do
          local propname = field .. "_"
          local typ = schema[field][1]
          local val = self[propname]
          assert(type(val) == typ,
                 string_format("%s [%s:getProperties()] Type mismatch, %s expected %s, actual is %s",
                                   tostring(self), self.class.__cname, field, typ, type(val)))
          properties[field] = val
      end
  
      if type(filter) == "table" then
          filterProperties(properties, filter)
      end
  
      return properties
  end
  
  function ModelBase:getProperty(property)
      if type(property) ~= "string" then return nil end
      if not self.class.schema[property] then return nil end
      return self:getProperties({property})[property]
  end
  

  function ModelBase:setProperty(property, value)

      if not self.class.schema[property] then
          print(string_format("%s [%s:setProperty()] Invalid property : %s",
              tostring(self), self.class.__cname, property))
          return
      end
  
      local typ, def = table_unpack(self.class.schema[property])
      local propname = property .. "_"
  
      if typ == "number" then value = tonumber(value) end

      if typ == "table" and not value then
          value = self[propname] -- table 可以用自己的缓冲
      end

      assert(type(value) == typ,
         string_format("%s [%s:setProperties()] Type mismatch, %s expected %s, actual is %s",
           tostring(self), self.class.__cname, property, typ, type(value)))
      self[propname] = value
  

      if not self.cacheFields[property] then
          -- table 使用msgpack
          if typ == "table" then
              value = MsgPack.pack(value)
          end

          redisproxy:hset(self:getKey(), property, value)

      end
  end
  

  function ModelBase:incrProperty(property, value)

      if not self.class.schema[property] then
          print(string_format("%s [%s:setProperty()] Invalid property : %s",
              tostring(self), self.class.__cname, property))
          return
      end
  
      local typ, def = table_unpack(self.class.schema[property])
      local propname = property .. "_"
  

      if typ == "table" then return end

      if typ == "number" then value = tonumber(value) end

      assert(type(value) == typ,
         string_format("%s [%s:setProperties()] Type mismatch, %s expected %s, actual is %s",
           tostring(self), self.class.__cname, property, typ, type(value)))
      self[propname] = self[propname] + value
  

      if not self.cacheFields[property] then

          return redisproxy:hincrby(self:getKey(), property, value)

      end
  end
  
  function ModelBase:onLoad()
  end
  
  function ModelBase:onCreate()
  end
  
  return ModelBase