using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TEAMModelOS.Model.Syllabus.Dtos;
using TEAMModelOS.Model.Syllabus.Models;
using TEAMModelOS.SDK.Helper.Common.CollectionHelper;
using TEAMModelOS.SDK.Helper.Common.JsonHelper;
using TEAMModelOS.Service.Core.Implements;
using TEAMModelOS.Service.Syllabus.Interfaces;

namespace TEAMModelOS.Service.Syllabus.Implements
{
    public class KnowledgeService : BaseService, IKnowledgeService
    {
        public async Task<List<KnowledgePoint>> FindKnowledgePointByDict(KnowledgeDto knowledgePoint) {
            List<KnowledgePoint> points = await FindListByDict<KnowledgePoint>(knowledgePoint.PointParams);
            if (knowledgePoint.Periods.IsNotEmpty()) {
                HashSet<KnowledgePoint> knowledges = new HashSet<KnowledgePoint>();
                foreach (string period in knowledgePoint.Periods) {
                    if (!string.IsNullOrEmpty(period)) {
                        knowledges.UnionWith(points.Where(x => x.AdvicePeriodCode.Contains(period)).ToHashSet());
                    }
                }
                return knowledges.OrderBy(x=>x.Order).ToList();
            }
            return points.OrderBy(x => x.Order).ToList(); 
        }

        public async Task<List<BlockPointDto>> FindKnowledgeBlockAndPointByDict(KnowledgeDto knowledgePoint) {
            List<KnowledgeBlock> blocks = await FindListByDict<KnowledgeBlock>(knowledgePoint.PointParams);
            List<KnowledgeBlockPoint> blockPoints = await FindListByDict<KnowledgeBlockPoint>(knowledgePoint.PointParams);
            
            if (knowledgePoint.Periods.IsNotEmpty())
            {
                HashSet<KnowledgeBlock> knowledges = new HashSet<KnowledgeBlock>();
                HashSet<KnowledgeBlockPoint> knowledgeBlocks = new HashSet<KnowledgeBlockPoint>();
                foreach (string period in knowledgePoint.Periods)
                {
                    if (!string.IsNullOrEmpty(period))
                    {
                        knowledges.UnionWith(blocks.Where(x => x.AdvicePeriodCode.Contains(period)).ToHashSet());
                        knowledgeBlocks.UnionWith(blockPoints.Where(x => x.AdvicePeriodCode.Contains(period)).ToHashSet());
                    }
                }
                blocks= knowledges.OrderBy(x => x.Order).ToList();
                blockPoints= knowledgeBlocks.OrderBy(x => x.Order).ToList();


            }
            
            return ListToTree(blocks, blockPoints);
        }

        private List<BlockPointDto> ListToTree(List<KnowledgeBlock> blocks ,List<KnowledgeBlockPoint>  points)
        {
            List<PointDto> pointList = MessagePackHelper.JsonToObject<List<PointDto>>(MessagePackHelper.ObjectToJson(points));
            List<BlockPointDto> blockList = MessagePackHelper.JsonToObject<List<BlockPointDto>>(MessagePackHelper.ObjectToJson(blocks));
            Dictionary<string, List<PointDto>> pointDict = new Dictionary<string, List<PointDto>>();
            List<string> keys = (pointList.GroupBy(c => c.BlockId).Select(group => group.Key)).ToList();
            foreach (string key in keys) {
                pointDict.Add(key, pointList.Where(x => x.BlockId.Equals(key)).ToList());
            }
            var blockDict = blockList.ToDictionary(n => n.RowKey, n => n);
            return GetChild(blockList, blockDict , pointDict);
        }
        public List<BlockPointDto> GetChild(List<BlockPointDto> list, Dictionary<string, BlockPointDto> blockDict, Dictionary<string, List<PointDto>> pointDict)
        {
            List<PointDto> empt = new List<PointDto>();
            list = list.OrderBy(m => m.Order).ToList();
            List<BlockPointDto> trees = new List<BlockPointDto>();
            foreach (BlockPointDto node in list)
            {
                bool fl= pointDict.TryGetValue(node.RowKey,out List<PointDto> points);
                if (fl && points.IsNotEmpty())
                {
                    node.Points = points;
                }
                else {
                    node.Points = empt;
                }
                bool flag = blockDict.TryGetValue(node.Pid, out BlockPointDto syllabus);
                if (flag && syllabus != null)
                {
                    syllabus.Children.Add(node);
                }
                else
                {
                    trees.Add(node);
                }
            }
            return trees.OrderBy(x=>x.Order).ToList();
        }
    }
}