using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EMISOnline.DataLogic.Repositories;
using EMISOnline.ViewModel.ExamView;
using EMISOnline.Entities;
using System.Linq.Expressions;

namespace EMISOnline.DataLogic.ExamSetting
{
    public class QuestionSettingDAL
    {
        public base_question_typeRepository typeRepository { get; set; }
        public questionRepository questionRepository { get; set; }
        public question_provid_answerRepository answerRepository { get; set; }
        public question_libaryRepository libaryRepository { get; set; }
        public base_paramRepository paramRepository { get; set; }
        /// 获取试题列表
        /// </summary>
        public IQueryable<ExamQuestionView> GetQuestionList( Expression<Func<test_question, bool>> expWhere)
        { 
            var query = from q in questionRepository.Entities.Where(expWhere)
                        join lib in libaryRepository.Entities on q.test_question_libary_id equals lib.test_question_libary_id
                        where q.test_question_ParentId == null
                        orderby q.test_question_Id descending
                        select new ExamQuestionView
                        {
                            test_question_Id = q.test_question_Id,
                            content = q.content,
                            base_question_type_id = q.base_question_type_id,
                            question_type_name = q.test_base_question_type.Name, 
                            difficulty_degree = q.difficulty_degree,//(from p in context.test_base_param where p.base_param_parent_id == 3 && p.base_param_id == q.difficulty_degree select p.name).Single(),
                            test_question_libary_id = q.test_question_libary_id,
                            questione_lib_name = lib.name,
                            answers = q.answers,
                            is_vaild = q.is_vaild,
                            used_count = q.used_count,
                            created_date = q.created_date
                        }
                        ;
            return query;
        }

        /// <summary>
        /// 获取所有子类库
        /// </summary>
        /// <param name="isFill">是否归档,Null查询所有</param>
        /// <param name="parentid">类库ID</param>
        /// <param name="subList">子类列表</param>
        public void GetSubLibary(bool? isFill, decimal parentid, IList<test_question_libary> subList)
        {
            var query = from lib in libaryRepository.Entities
                        where lib.parent_id == parentid && (isFill == null || lib.filled == isFill)
                        select lib;

            foreach (var subLib in query.ToList())
            {
                subList.Add(subLib);
                GetSubLibary(isFill, subLib.test_question_libary_id, subList);
            }
        }
    }
}