/// <summary>
/// 创建标签
/// </summary>
/// <remarks>
/// 一个公众号，最多可以创建100个标签。
/// </remarks>
function CreateTag(const ATagName: string): TWechatTag;

function TWechatRequest.CreateTag(const ATagName: string): TWechatTag;
var
  Content, Response: TJSONObject;
begin
  Result := nil;
  Content := TJSONObject.Create.AddPair('tag', TJSONObject.Create.AddPair('name', ATagName));
  try
    Response := HttpPost(Content, 'tags/create');
    try
      if ParseResponse(Response) then
      begin
        Result := TJson.Json2Object<TWechatTag>(Response.Values['tag'].ToJSON);
        Result.Count := 0;
      end;
    finally
      FreeAndNil(Response);
    end;
  finally
    FreeAndNil(Content);
  end;
end;

/// <summary>
/// 获取公众号已创建的标签
/// </summary>
function GetTags: TWechatTags;

function TWechatRequest.GetTags: TWechatTags;
var
  JsonString: string;
  Response: TJSONObject;
begin
  Response := HttpGet('tags/get');
  try
    if ParseResponse(Response) then
    begin
      JsonString := Response.GetValue<TJSONArray>('tags').ToJSON;
      Result := TJson.Json2Object<TWechatTags>(JsonString);
    end;
  finally
    FreeAndNil(Response);
  end;
end;

/// <summary>
/// 删除标签
/// </summary>
/// <remarks>
/// 当某个标签下的粉丝超过10w时，后台不可直接删除标签。
/// 此时，开发者可以对该标签下的openid列表 ,
/// 先进行取消标签的操作，直到粉丝数不超过10w后，才可直接删除该标签。
/// </remarks>
function DeleteTag(ATagId: Integer): Boolean;

function TWechatRequest.DeleteTag(ATagId: Integer): Boolean;
var
  Content, Response: TJSONObject;
begin
  Content := TJSONObject.Create.AddPair('tag', TJSONObject.Create.AddPair('id', TJSONNumber.Create(ATagId)));
  try
    Response := HttpPost(Content, 'tags/delete');
    try
      Result := ParseResponse(Response);
    finally
      FreeAndNil(Response);
    end;
  finally
    FreeAndNil(Content);
  end;
end;

/// <summary>
/// 编辑标签
/// </summary>
function UpdateTag(ATagId: Integer; ANewName: string): Boolean;

function TWechatRequest.UpdateTag(ATagId: Integer; ANewName: string): Boolean;
var
  Content, Response: TJSONObject;
begin
  Content := TJSONObject.Create.AddPair('tag', TJSONObject.Create
      .AddPair('id', TJSONNumber.Create(ATagId))
      .AddPair('name', ANewName)
    );
  try
    Response := HttpPost(Content, 'tags/update');
    try
      Result := ParseResponse(Response);
    finally
      FreeAndNil(Response);
    end;
  finally
    FreeAndNil(Content);
  end;
end;

/// <summary>
/// 设置用户备注名
/// </summary>
/// <remarks>
/// https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140838
/// </remarks>
function UpdateRemark(const AOpenID, ARemark: string): Boolean;

function TWechatRequest.UpdateRemark(const AOpenID, ARemark: string): Boolean;
var
  Content, Response: TJSONObject;
begin
  Content := TJSONObject.Create.AddPair('openid', AOpenID).AddPair('remark', ARemark);
  try
    Response := HttpPost(Content, 'user/info/updateremark');
    try
      Result := ParseResponse(Response);
    finally
      FreeAndNil(Response);
    end;
  finally
    FreeAndNil(Content);
  end;
end;

/// <summary>
/// 获取单个用户基本信息
/// </summary>
function GetUserInfo(const AOpenID: string): TWechatUser;

function TWechatRequest.GetUserInfo(const AOpenID: String): TWechatUser;
var
  Response: TJSONObject;
begin
  Result := nil;
  Response := HttpGet('user/info', Format('openid=%s&lang=zh_CN', [AOpenID]));
  try
    if ParseResponse(Response) then
      Result := TWechatUser.FromJsonString(Response.ToJSON);
  finally
    FreeAndNil(Response);
  end;
end;