using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EMISOnline.DataLogic.ExamSetting;
using System.Web.Script.Serialization;
using System.Collections;
using EMISOnline.ViewModel.ExamView;
using Bowin.Web.Controls.Mvc;
using System.Data;

namespace EMISOnline.CommonLogic.ExamServices
{
    public class QuestionServices : IQuestionServices
    {
        public QuestionDAL QuestionDAL { get; set; }

        public Entities.test_base_question_type[] ListAllQuestionType()
        {
            return QuestionDAL.ListAllQuestionType();
        }

        public decimal[] GeneratePractice(string[] libaryids, List<string> typeID, int? num)
        {
            return QuestionDAL.GeneratePractice(libaryids, typeID, num);
        }

        public string GetQuestion(decimal question_id)
        {
            var question = QuestionDAL.GetQuestion(new decimal[] { question_id });
            var js = new JavaScriptSerializer();
            return js.Serialize(question);
        }

        public string ShowPaperQuestion(decimal[] QeustionSet, Dictionary<string, string> Answers)
        {
            var questions = QuestionDAL.GetPaperQuestion(Answers.Keys.Select(q => decimal.Parse(q)).ToArray()).ToList();
            var questionTypes = QuestionDAL.ListAllQuestionType();
            var result = new ArrayList();
            questions.ForEach(q =>
            {
                q.userAnswer = Answers[q.question_id.ToString()];
                ReadQuestion(q, q.userAnswer, (int)q.question_typeid);
            });
            foreach (var type in questionTypes)
            {
                if (questions.Any(q => q.question_typeid == type.base_question_type_id))
                    result.Add(new { id = type.base_question_type_id, name = type.Name, questions = questions });
            }
            var data = new
            {
                score = questions.Sum(q => q.score),//试题总分
                studentscore = questions.Sum(q => q.userscore), //你的得分
                questionnumber = QeustionSet.Count(),//试题总数
                rightnumber = questions.Count(q => q.userscore > 0),//答对题数
                errornumber = questions.Count(q => q.userscore == 0 && !string.IsNullOrEmpty(q.userAnswer)),//答错题数
                unquestion = QeustionSet.Count() - Answers.Count,//未答题数
            };
            var js = new JavaScriptSerializer();
            return js.Serialize(new { data = data, result = result });
        }
        private void ReadQuestion(PaperQuestionView question, string useranser, int questionType)
        {
            var isRight = false;
            switch (questionType)
            {
                case 1:
                    isRight = question.rightAnswer == useranser.Trim();
                    break;
                case 2:
                    var provid = question.answers.Select(q => true).ToArray();
                    isRight = string.Join("|", provid) == useranser.Trim();
                    break;
                case 3:
                    isRight = question.rightAnswer == OrderAnswer(useranser);
                    break;
                case 4:
                    isRight = question.rightAnswer == useranser.Trim();
                    break;
                default:
                    break;
            }
            if (isRight)
                question.userscore = question.score;
        }
        private string OrderAnswer(string answer)
        {
            var answerArr = answer.Split('|');
            return string.Join(",", answerArr.OrderBy(q => q).ToArray());
        }

        public List<TreeItem> ListQuesLibTreeStu()
        {
            List<TreeItem> rtn = new List<TreeItem>();
            var TreeDT = QuestionDAL.ListQuesLibTreeStu(); 
            var query = TreeDT.AsEnumerable().Where(e => e.Field<decimal>("parent_id") == 1);

            foreach (var node in query.ToList())
            {
                TreeItem item = new TreeItem();
                item.id = node.Field<decimal>("test_question_libary_id").ToString();
                item.text = node.Field<string>("name").ToString(); ;
                item.attributes = "";
                item.children = CreateChildTree(TreeDT, node.Field<decimal>("test_question_libary_id"));
            
                rtn.Add(item);
            }
            return rtn;
        }
        public List<TreeItem> CreateChildTree(DataTable TreeDT, decimal parent_id)
        {
            List<TreeItem> rtn = new List<TreeItem>();
            var query = TreeDT.AsEnumerable().Where(e => e.Field<decimal>("parent_id") == parent_id);

            foreach (var node in query.ToList())
            {
                TreeItem item = new TreeItem();
                item.id = node.Field<decimal>("test_question_libary_id").ToString();
                item.text = node.Field<string>("name").ToString(); ;
                item.attributes = "";
                item.children = CreateChildTree(TreeDT, node.Field<decimal>("test_question_libary_id"));
                
                rtn.Add(item);
            }
            return rtn;
        }
    }
}