using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EMIS.DataLogic.Repositories;
using EMIS.Entities;
using System.Linq.Expressions;

namespace EMIS.DataLogic.SystemDAL
{
    public class MenuDAL
    {
        public RoleRepository RoleRepository { get; set; }
        public UserRepository UserRepository { get; set; }
        public MenuRepository MenuRepository { get; set; }

        public IQueryable<Sys_Menu> GetMenuByUser(
            Expression<Func<Sys_Menu, bool>> menuDefineExp,
            Expression<Func<Sys_User, bool>> userExp)
        {
            var userFunc = userExp;
            var menuDefineFunc = menuDefineExp;

            var iqResult = from m in (
                               (from u in this.UserRepository.GetList(userExp) 
                               from r in u.Sys_Role
                               from f in r.Sys_FunctionCode 
                               join m in MenuRepository.GetList(menuDefineExp) on f.FunctionCode equals m.FunctionCode
                               select m
                               ).Concat(
                               MenuRepository.GetList(menuDefineExp).Where(x => x.FunctionCode == null)
                               )
                           )
                           group m by m into g
                           select g.Key;

            return iqResult;
        }
    }
}