using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Data.SqlClient;
using System.Linq;
using System.Threading;
using System.Web;
using Weee.DAL;
using Weee.Models;
using Weee.ViewModels.Lca.LCARiskAssmtSurveyForm;

namespace Weee.Service
{
    public class SignificanceAssmtDataService : WeeeLCADataService
    {
        public SignificanceAssmtDataService(WeeeDataContext db)
        : base(db)
        {
        }

        public IQueryable<LCARiskAssmtSurveyForm_SignificanceAssmtQuery> GetList(int LCAID)
        //public IQueryable<LCARiskAssmtSurveyForm_SignificanceAssmt> GetList(int LCAID)
        {
            if (!AuthorizedLCAs.Contains(LCAID)) throw new Exception("not authorized");
            var qry = _db.Set<LCARiskAssmtSurveyForm_SignificanceAssmt>().Include(x => x.FactorScores).Where(x => x.LCAID == LCAID)
                .OrderByDescending(x => x.ID);
            //var qry2 = qry.ToList();
            //return qry;
            var qry2 = (from a in qry
                        join b in _db.LCARiskAssmtSurveyForm_LifecycleAssmts on
                            new { LCAID = a.LCAID, LifeCycleStage = a.LifeCycleStage, GHGEvaluateItem = a.GHGEvaluateItem }
                            equals new { LCAID = b.LCAID, LifeCycleStage = b.LifeCycleStage, GHGEvaluateItem = b.GHGEvaluateItem }
                        select new LCARiskAssmtSurveyForm_SignificanceAssmtQuery
                        {
                            emitPercentage = b.Percentage,
                            ID = a.ID,
                            LCAID = a.LCAID,
                            Comment = a.Comment,
                            CreatedBy = a.CreatedBy,
                            CreatedDate = a.CreatedDate,
                            FactorScores = a.FactorScores,
                            ModifiedBy = a.ModifiedBy,
                            ModifiedDate = a.ModifiedDate,
                            OwnerLCA = a.OwnerLCA,
                            LifeCycleStage = a.LifeCycleStage,
                            Category = a.Category,
                            GHGEvaluateItem = a.GHGEvaluateItem,
                            Score = a.Score,
                            Significance = a.Significance
                        });
            return qry2;
        }

        public IQueryable<LCARiskAssmtSurveyForm_AssmtFactor> GetAssmtFactors(int LCAID)
        {
            return _db.Set<LCARiskAssmtSurveyForm_AssmtFactor>().Include(x => x.FactorScores).Where(x => x.LCAID == LCAID);
        }

        public void Sync(int LCAID)
        {
            // CFT-511 由主表同步到顯著性評估，要刪除已不存在的項目
            string sql = $@"
delete s
from LCARiskAssmtSurveyForm_SignificanceAssmt s
left join LCARiskAssmtSurveyForm_LifecycleAssmt l on s.LCAID=l.LCAID and s.LifeCycleStage=l.LifeCycleStage and s.GHGEvaluateItem=l.GHGEvaluateItem
where (l.LCAID is null or l.LifeCycleStage is null or l.GHGEvaluateItem is null or l.GHGinventoryItemNo is null or len(GHGinventoryItemNo)=0) and s.LCAID=@LCAID
";
            int rows = _db.Database.ExecuteSqlCommand(sql, new SqlParameter("@LCAID", LCAID));
            sql = $@"
delete s
from LCARiskAssmtSurveyForm_SignificanceAssmtFactor s
join LCARiskAssmtSurveyForm_SignificanceAssmt a on s.SignificanceAssmtID=a.ID
left join LCARiskAssmtSurveyForm_AssmtFactor f on f.ID=s.AssmtFactorID
where f.id is null and a.LCAID=@LCAID
";
            rows = _db.Database.ExecuteSqlCommand(sql, new SqlParameter("@LCAID", LCAID));
            var user = GetUserContext();
            var list = GetList(LCAID).ToList(); // destination
            var analyses = _db.Set<LCARiskAssmtSurveyForm_LifecycleAssmt>()
                .Where(x => x.LCAID == LCAID && x.GHGinventoryItemNo!=null && x.GHGinventoryItemNo.Length>0).ToList();
            var factors = _db.Set<LCARiskAssmtSurveyForm_AssmtFactor>().Where(x => x.LCAID == LCAID).ToList();
            if (analyses.Count == 0)
            {
                throw new Exception("从生命週期流程圖及評估複製資料失败！");
            }
            else if (factors.Count < 2)
            {
                throw new Exception("請最少設定兩個以上的評估因子，才可以同步！");
            }
            else
            {
                foreach (var lifecycleAssmt in analyses) // source
                {
                    if (!list.Any(s => s.LifeCycleStage == lifecycleAssmt.LifeCycleStage && s.GHGEvaluateItem == lifecycleAssmt.GHGEvaluateItem))
                    {
                        int parsedCategory = 0;
                        int.TryParse(lifecycleAssmt.category, out parsedCategory);
                        var toBeAdd = new LCARiskAssmtSurveyForm_SignificanceAssmt()
                        {
                            LCAID = LCAID,
                            LifeCycleStage = lifecycleAssmt.LifeCycleStage,
                            GHGEvaluateItem = lifecycleAssmt.GHGEvaluateItem,
                            Category= parsedCategory,//lifecycleAssmt.category,
                            CreatedBy = user.Id,
                            CreatedDate = DateTime.Now
                        };
                        //SetCategory(toBeAdd);
                        foreach (var factor in factors)
                        {
                            toBeAdd.FactorScores.Add(new LCARiskAssmtSurveyForm_SignificanceAssmtFactor()
                            {
                                AssmtFactorID = factor.ID
                            });
                        }
                        _db.Set<LCARiskAssmtSurveyForm_SignificanceAssmt>().Add(toBeAdd);
                        _db.Entry(toBeAdd).State = EntityState.Added;
                    }
                }
                _db.SaveChanges();
            }
        }

        //private void SetCategory(LCARiskAssmtSurveyForm_SignificanceAssmt significanceAssmt)
        //{
        //    /*
        //     * 1. 原物料取得，category 4
        //     * 2. 上游運輸, category 3
        //     * 3. 運作支援及服務, 僅外購電力為category 2, 其餘為category 4
        //     * 4. 下游運輸, category 3
        //     * 5. 產品使用及廢棄, category 5
        //     * 6. 廢棄物處理, category 4
        //     */

        //    if (significanceAssmt.LifeCycleStage == 1)
        //    {
        //        significanceAssmt.Category = 4;
        //    }
        //    else if (significanceAssmt.LifeCycleStage == 2)
        //    {
        //        significanceAssmt.Category = 3;
        //    }
        //    else if (significanceAssmt.LifeCycleStage == 3)
        //    {
        //        significanceAssmt.Category = IsPurchasedElectricity(significanceAssmt.GHGEvaluateItem) ? 2 : 4;
        //    }
        //    else if (significanceAssmt.LifeCycleStage == 4)
        //    {
        //        significanceAssmt.Category = 3;
        //    }
        //    else if (significanceAssmt.LifeCycleStage == 5)
        //    {
        //        significanceAssmt.Category = 5;
        //    }
        //    else if (significanceAssmt.LifeCycleStage == 6)
        //    {
        //        significanceAssmt.Category = 4;
        //    }
        //}

        private bool IsPurchasedElectricity(string ghgEvaluateItem)
        {
            return !string.IsNullOrEmpty(ghgEvaluateItem) && ghgEvaluateItem.Contains("外購電力") && ghgEvaluateItem.ToUpper().StartsWith("C2");
        }

        public void UpdateGradingScore(int LCAID, int GradingScore)
        {
            var lca = GetLCA(LCAID);
            var list = GetList(LCAID).ToList();

            foreach (var significanceAssmt in list)
            {
                significanceAssmt.Significance = significanceAssmt.Score >= GradingScore ? 1 : 0;
                _db.LCARiskAssmtSurveyForm_SignificanceAssmts.AddOrUpdate(significanceAssmt);
            }

            lca.GradingScore = GradingScore;
            _db.SaveChanges();
        }

        public void UpdateListDefaultPurpose(int LCAID, string ListDefaultPurpose)
        {
            var lca = GetLCA(LCAID);
            lca.ListDefaultPurpose = ListDefaultPurpose;
            int rows = _db.SaveChanges();
            Thread.Sleep(0);
        }

        public LCARiskAssmtSurveyForm_SignificanceAssmt Save(LCARiskAssmtSurveyForm_SignificanceAssmt toBeSave)
        {
            var user = GetUserContext();

            if (!AuthorizedLCAs.Contains(toBeSave.LCAID)) throw new Exception("not authorized");
            var entry = _db.Entry(toBeSave);
            if (toBeSave.ID == 0)
            {
                // 資料來自於生命週期流程圖及評估
                toBeSave.CreatedBy = user.Id;
                toBeSave.CreatedDate = DateTime.Now;
                entry.State = EntityState.Added;
            }
            else
            {
                foreach (var factorScore in toBeSave.FactorScores)
                {
                    _db.Entry(factorScore).State = EntityState.Modified;
                }

                toBeSave.ModifiedBy = user.Id;
                toBeSave.ModifiedDate = DateTime.Now;
                entry.State = EntityState.Modified;
                entry.Property(x => x.LCAID).IsModified = false;
            }

            _db.SaveChanges();
            return toBeSave;
        }

        public void Delete(int ID)
        {
            var entry = _db.Set<LCARiskAssmtSurveyForm_SignificanceAssmt>().Where(x => x.ID == ID).Single();
            var LCA = GetLCA(entry.LCAID);
            if (LCA.Status != LCAStatus.New && LCA.Status != LCAStatus.Processing) throw new Exception("Business logic error , should not delete data in this status: " + LCA.Status.ToString());

            var ToBeDelete = _db.Entry(entry);
            ToBeDelete.State = EntityState.Deleted;

            _db.SaveChanges();
        }
    }
}