%%% -------------------------------------------------------------------
%%% Author  : Sergei Polkovnikov <serge.polkovnikov@gmail.com>
%%% Description : The library with functions for generation random lists
%%%              of the virtual users
%%% Created : Mar 25, 2013
%%% -------------------------------------------------------------------

-module(nsg_crowd_lib).
-include_lib("kvs/include/user.hrl").

-compile(export_all).

create_users(A,B) ->
    ImagioUsers = fake_users:imagionary_users(),
    [ begin 
        {Id,Name,Surname} = lists:nth(N,ImagioUsers),
        U = #user{  username = Id,
                    id = Id,
                    names = Name,
                    surnames = Surname,
                    birth={1981,9,29} }, kvs:put(U) end || N <- lists:seq(A, B) ].

virtual_users() ->
    case kvs:get(user,"maxim@synrc.com") of
        {aborted,_} -> kvs:join(), kvs:init_db(),
                create_users(1,100), kvs:put(#user{id="maxim@synrc.com"});
        {ok,_} -> skip end,

    AllUsers = fake_users:imagionary_users(),
    F = fun({UserId,_,_}, Acc) ->
        User = auth_server:get_user_info_by_user_id(UserId),
        case User of
                    {error,_} -> Acc;
                    _ -> [UserId | Acc]
                end
        end,
    lists:usort(lists:foldl(F, [], AllUsers)).

random_users(Num, AllUsers) ->
    AllUsersNum = length(AllUsers),
    random_users(Num, [], AllUsers, AllUsersNum).

random_users(0, Acc, _AllUsers, _AllUsersNum) -> Acc;
random_users(N, Acc, AllUsers, AllUsersNum) ->
    User = lists:nth(crypto:rand_uniform(1, AllUsersNum + 1), AllUsers),
    case lists:member(User, Acc) of
        false -> random_users(N - 1, [User | Acc], AllUsers, AllUsersNum);
        true -> random_users(N, Acc, AllUsers, AllUsersNum)
    end.