using ClosedXML.Excel;
using PagedList;
using Qcarbon.ViewModels.admin;
using Qcarbon.ViewModels.DTO;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using Weee.Areas.Admin.ViewModels;
using Weee.DAL;
using Weee.Models;
using Weee.ViewModels;
using Microsoft.AspNet.Identity;
using Resources;
using System.IO;
using System.Net.Mime;

namespace Weee.Areas.Admin.Controllers
{
    public class ARnGWPController : AdminControllerBase
    {
        public ARnGWPController(WeeeDataContext d) : base(d)
        {
        }
        protected override void Initialize(RequestContext requestContext)
        {
            base.Initialize(requestContext);
        }

        public ActionResult Index(int page = 1, string arv="AR6")
        {
            ARnGWPvm viewModel = new ARnGWPvm();
            viewModel.arv = arv;
            var qry =
                (from a in db.AssessmentReportGWP
                 //join b in db.AssessmentReportVersion on a.ARversion equals b.ARversion
                 //where a.ARversion == arv
                 orderby a.ingredientName
                 select new ARnGWProwViewModel
                 {
                     ID=a.ID,
                     ingredientName=a.ingredientName,
                     chemicalFormula=a.chemicalFormula,
                     GWP100=(arv=="AR6"?a.AR6GWP100:(arv=="AR4"?a.AR4GWP100:a.AR5GWP100)),
                     ChineseName=a.ChineseName,
                     Alias=a.Alias,
                     GHGType=a.GHGType,
                     GWPtype=a.GWPtype
                 }).AsQueryable();
            if (qry == null)
                return View(viewModel );
            var assessmentReportGWPs = qry.ToList();
            var onePage = assessmentReportGWPs.ToPagedList(page, 10);
            viewModel.ARnGWPlst = onePage;
            return View(viewModel);
        }
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Index(ARnGWPvm viewModel)
        {
            switch (viewModel.cmd)
            {
                case "upload":
                    // 以下參考來自 c:\_git\weeecarbonfootprint\weee\Areas\admin\Controllers\ParameterController.cs
                    var errMsg = processExcelUpload(viewModel);
                    if (!string.IsNullOrEmpty(errMsg))
                        TempData["ErrMsg"] = viewModel.errMsg;
                    return RedirectToAction("Index", "ARnGWP", new { viewModel.arv });
                case "download":
                    return processExcelDownload(db.AssessmentReportGWP.ToList());
            }
            return View(viewModel);
        }
        public ActionResult AR4()
        {
            return RedirectToAction("index", new { page = 1, arv = "AR4" });
        }
        public ActionResult AR5()
        {
            return RedirectToAction("index", new { page = 1, arv = "AR5" });
        }
        public ActionResult AR6()
        {
            return RedirectToAction("index", new { page = 1, arv = "AR6" });
        }

        public ActionResult Edit(int id, string arv="AR6")
        {
            var rq = Request.Form;
            var qry =
               (from a in db.AssessmentReportGWP
                    //join b in db.AssessmentReportVersion on a.ARversion equals b.ARversion
                 where a.ID == id
                 select new ARnGWProwViewModel
                {
                    ID = a.ID,
                    ingredientName = a.ingredientName,
                    chemicalFormula = a.chemicalFormula,
                    GWP100 = (arv == "AR6" ? a.AR6GWP100 : (arv == "AR4" ? a.AR4GWP100 : a.AR5GWP100)),
                    ChineseName = a.ChineseName,
                    Alias = a.Alias,
                    GHGType = a.GHGType,
                    GWPtype = a.GWPtype
                }).AsQueryable();
            if (qry == null)
                return HttpNotFound();

            List<SelectListItem> selectGWPparameterType = new List<SelectListItem>();
            selectGWPparameterType.Add(new SelectListItem() { Text = "", Value = "" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.OtherCompound, Value = "0" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.Refrigerant, Value = "1" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.ParamemterCategoriesFireEquipment, Value = "2" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.ParamemterCategoriesFireEquipment+'&'+Resource.Refrigerant, Value = "3" });
            ViewBag.selectGWPparameterType = selectGWPparameterType;
            return View(qry.Single());
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit(int id, ARnGWProwViewModel viewModel, string arv = "AR6")
        {
            if (ModelState.IsValid)
            {
                if (viewModel.cmd=="cancel")
                    return RedirectToAction("index", new { page = 1, arv });
                var ToBeEdit = db.AssessmentReportGWP.Single(x => x.ID == id);

                ToBeEdit.ingredientName = viewModel.ingredientName;
                ToBeEdit.chemicalFormula = viewModel.chemicalFormula;
                switch (arv)
                {
                    case "AR4":
                        ToBeEdit.AR4GWP100 = viewModel.GWP100;
                        break;
                    case "AR5":
                        ToBeEdit.AR5GWP100 = viewModel.GWP100;
                        break;
                    case "AR6":
                        ToBeEdit.AR6GWP100 = viewModel.GWP100;
                        break;
                }
                ToBeEdit.ChineseName = viewModel.ChineseName;
                ToBeEdit.Alias = viewModel.Alias;
                ToBeEdit.GHGType = viewModel.GHGType != null ? viewModel.GHGType : "";
                ToBeEdit.GWPtype = viewModel.GWPtype;
                ToBeEdit.modifyTime = DateTime.Now;
                ToBeEdit.modifyBy = User.Identity.GetUserName();
                db.SaveChanges();
                return RedirectToAction("index", new { page = 1, arv });
            }
            return RedirectToAction("index", new { page = 1, arv });
        }

        public ActionResult Create(string arv = "AR6")
        {
            List<SelectListItem> selectGWPparameterType = new List<SelectListItem>();
            selectGWPparameterType.Add(new SelectListItem() { Text = "", Value = "" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.OtherCompound, Value = "0" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.Refrigerant, Value = "1" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.ParamemterCategoriesFireEquipment, Value = "2" });
            selectGWPparameterType.Add(new SelectListItem() { Text = Resource.ParamemterCategoriesFireEquipment + '&' + Resource.Refrigerant, Value = "3" });
            ViewBag.selectGWPparameterType = selectGWPparameterType;
            var viewModel = new ARnGWProwViewModel();
            return View(viewModel);
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(ARnGWProwViewModel viewModel, string arv = "AR6")
        {
            if (ModelState.IsValid)
            {
                var ToBeEdit = new AssessmentReportGWP();
                ToBeEdit.ingredientName = viewModel.ingredientName;
                ToBeEdit.chemicalFormula = viewModel.chemicalFormula;
                switch (arv)
                {
                    case "AR4":
                        ToBeEdit.AR4GWP100 = viewModel.GWP100;
                        ToBeEdit.AR5GWP100 = 0M;
                        ToBeEdit.AR6GWP100 = 0M;
                        break;
                    case "AR5":
                        ToBeEdit.AR5GWP100 = viewModel.GWP100;
                        ToBeEdit.AR4GWP100 = 0M;
                        ToBeEdit.AR6GWP100 = 0M;
                        break;
                    case "AR6":
                        ToBeEdit.AR6GWP100 = viewModel.GWP100;
                        ToBeEdit.AR4GWP100 = 0M;
                        ToBeEdit.AR5GWP100 = 0M;
                        break;
                }
                ToBeEdit.ChineseName = viewModel.ChineseName;
                ToBeEdit.Alias = viewModel.Alias;
                ToBeEdit.GHGType = viewModel.GHGType != null ? viewModel.GHGType : ""; ;
                ToBeEdit.GWPtype = viewModel.GWPtype;
                ToBeEdit.createTime = DateTime.Now;
                ToBeEdit.createBy = User.Identity.GetUserName();
                ToBeEdit.modifyTime = DateTime.Now;
                ToBeEdit.modifyBy = User.Identity.GetUserName();
                db.AssessmentReportGWP.Add(ToBeEdit);
                db.SaveChanges();
                return RedirectToAction("index", new { page = 1, arv });
            }
            return RedirectToAction("index", new { page = 1, arv });
        }

        public ActionResult Delete(int id, string arv = "AR6")
        {
            var toBeRemove = db.AssessmentReportGWP.Find(id);
            db.AssessmentReportGWP.Remove(toBeRemove);
            db.SaveChanges();
            return RedirectToAction("index", new { page = 1, arv });
        }

        public ActionResult DeleteAll()
        {
            try
            {
                db.AssessmentReportGWP.RemoveRange(db.AssessmentReportGWP.ToList());
                db.SaveChanges();
            }
            catch (Exception ex)
            {
                TempData["ErrMsg"] = ex.Message;
            }
            return RedirectToAction("Index", "ARnGWP", new { });
        }

        private FileStreamResult processExcelDownload(List<AssessmentReportGWP> data)
        {
            XLWorkbook excelWorkbook = new XLWorkbook(); // 寫資料進excelWorkbook
            string sheetName = "All GHG Values";
            var worksheet = excelWorkbook.Worksheets.Add(sheetName);
            int rowTh;

            var provider = ModelMetadataProviders.Current;
            worksheet.Cell($"A1").Value = "Chemical Formula";
            worksheet.Cell($"B1").Value = "Name";
            worksheet.Cell($"C1").Value = "Chinese-Name";
            worksheet.Cell($"D1").Value = "AR6-GWP100";
            worksheet.Cell($"E1").Value = "AR5-GWP100";
            worksheet.Cell($"F1").Value = "AR4-GWP100";
            worksheet.Cell($"G1").Value = "Alias";
            worksheet.Cell($"H1").Value = "GHG Type";
            worksheet.Cell($"I1").Value = "冷媒1/滅火器2/冷媒&滅火器3";

            rowTh = 2;
            foreach (AssessmentReportGWP oneData in data)
            {
                worksheet.Cell($"A{rowTh}").Value = $"{oneData.chemicalFormula}";
                worksheet.Cell($"B{rowTh}").Value = $"{oneData.ingredientName}";
                worksheet.Cell($"C{rowTh}").Value = $"{oneData.ChineseName}";
                worksheet.Cell($"D{rowTh}").Value = oneData.AR6GWP100;
                worksheet.Cell($"E{rowTh}").Value = oneData.AR5GWP100;
                worksheet.Cell($"F{rowTh}").Value = oneData.AR4GWP100;
                worksheet.Cell($"G{rowTh}").Value = $"{oneData.Alias}";
                worksheet.Cell($"H{rowTh}").Value = $"{oneData.GHGType}";
                worksheet.Cell($"I{rowTh}").Value = (int)oneData.GWPtype;
                rowTh++;
            }

            string myName = Server.UrlEncode(Resources.Resource.GWPFactor.Replace(' ', '_')
                + $"_{sheetName}_" + DateTime.Today.ToString("yyyyMMdd") + ".xlsx");
            MemoryStream stream = new MemoryStream();
            excelWorkbook.SaveAs(stream);
            stream.Position = 0;

            Response.Clear();
            Response.Buffer = true;
            Response.AddHeader("content-disposition", "attachment; filename=" + myName);
            Response.ContentType = "application/vnd.ms-excel";
            Response.BinaryWrite(stream.ToArray());
            Response.End();
            return new FileStreamResult(stream, MediaTypeNames.Application.Octet);
        }
        
        private string processExcelUpload(ARnGWPvm sour)
        {
            string err = "";
            try
            {
                var exlVmList = GetExcelData(sour.uploadExcelFile);
                exlVmList = exlVmList.ToList();
                if (exlVmList != null && exlVmList.Count() > 0)
                {
                    if (CkExcelData(exlVmList, out string ckErr))
                        SaveExelData(exlVmList);
                    else
                        throw new Exception(ckErr);
                }
            }
            catch (Exception ex)
            {
                ex = CScommon.Exceptions.inner(ex);
                err = ex.Message;
            }
            return err;
        }

        private List<ARnGWPExcelViewModel> GetExcelData(HttpPostedFileBase uploadExcelFile)
        {
            var re = new List<ARnGWPExcelViewModel>();
            if (uploadExcelFile == null || uploadExcelFile.InputStream == null || uploadExcelFile.InputStream.Length == 0)
                throw new Exception($"未指定上傳檔案!");
            else
            {
                string extesion = uploadExcelFile.FileName.Substring(uploadExcelFile.FileName.LastIndexOf(".") + 1);
                if (extesion.ToLower() != "xlsx")
                    throw new Exception("僅支持xlsx類型!");

                using (XLWorkbook workBook = new XLWorkbook(uploadExcelFile.InputStream))
                {
                    IXLWorksheet workSheet = workBook.Worksheet(1);
                    if (workSheet == null)
                        throw new Exception($"檔案錯誤, sheet 不存在!");
                    int ith = 0;
                    foreach (IXLRow row in workSheet.Rows())
                    {
                        ith++;
                        if (ith == 1)
                            continue; // skip first row
                        var exlIt = new ARnGWPExcelViewModel();
                        //chemicalFormula
                        string cellA = workSheet.Cell($"A{ith}").Value.ToString().Trim();
                        exlIt.chemicalFormula = cellA;
                        //ingredientName
                        string cellB = workSheet.Cell($"B{ith}").Value.ToString().Trim();
                        exlIt.ingredientName = cellB;
                        //ChineseName
                        string cellC = workSheet.Cell($"C{ith}").Value.ToString().Trim();
                        exlIt.ChineseName = cellC;
                        //AR6GWP100
                        string cellD = workSheet.Cell($"D{ith}").Value.ToString().Trim();
                        exlIt.AR6GWP100 = GetFromExcel(cellD);
                        //AR5GWP100
                        string cellE = workSheet.Cell($"E{ith}").Value.ToString().Trim();
                        exlIt.AR5GWP100 = GetFromExcel(cellE);
                        //AR4GWP100
                        string cellF = workSheet.Cell($"F{ith}").Value.ToString().Trim(); ;
                        exlIt.AR4GWP100 = GetFromExcel(cellF);
                        //Alias
                        string cellG = workSheet.Cell($"G{ith}").Value.ToString().Trim();
                        exlIt.Alias = cellG;
                        //GHGType
                        string cellH = workSheet.Cell($"H{ith}").Value.ToString().Trim();
                        exlIt.GHGType = cellH;
                        //GWPtype
                        string cellI = workSheet.Cell($"I{ith}").Value.ToString().Trim();
                        int GWPtype = 0;
                        int.TryParse(cellI, out GWPtype);
                        exlIt.GWPtype = GWPtype;
                        if(!(cellB.Equals("") && exlIt.AR4GWP100 == 0 && exlIt.AR5GWP100 == 0 && exlIt.AR6GWP100 == 0))
                        {
                            re.Add(exlIt);
                        }
                    }
                }
            }
            return re;
        }

        private bool CkExcelData(List<ARnGWPExcelViewModel> sour, out string errMsg)
        {
            errMsg = "";
            var errList = new List<string>();
            if (sour == null && sour.Count() == 0)
            {
                errMsg = "資料不可為空";
                return false;
            }

            if (errList != null && errList.Count() > 0)
            {
                errMsg = String.Join(",", errList);
                return false;
            }
            return true;
        }

        private void SaveExelData(List<ARnGWPExcelViewModel> sour)
        {
            string err = "";
            var transac = db.Database.BeginTransaction();
            try
            {
                if (sour != null && sour.Count() > 0)
                {
                    foreach (var it in sour)
                    {
                        bool existed = true;
                        var ToBeAdded = db.AssessmentReportGWP.Where(x => x.ingredientName.Equals(it.ingredientName)).FirstOrDefault();
                        if(ToBeAdded == null)
                        {
                            ToBeAdded = new AssessmentReportGWP();
                            existed = false;
                        }
                        ToBeAdded.ingredientName = it.ingredientName;
                        ToBeAdded.chemicalFormula = it.chemicalFormula;
                        ToBeAdded.AR4GWP100 = it.AR4GWP100;
                        ToBeAdded.AR5GWP100 = it.AR5GWP100;
                        ToBeAdded.AR6GWP100 = it.AR6GWP100;
                        ToBeAdded.ChineseName = it.ChineseName;
                        ToBeAdded.Alias = it.Alias;
                        ToBeAdded.GHGType = it.GHGType;
                        ToBeAdded.GWPtype = (GWPparameterType) it.GWPtype;
                        ToBeAdded.modifyTime = DateTime.Now;
                        ToBeAdded.modifyBy = User.Identity.GetUserName();
                        if (!existed)
                        {
                            ToBeAdded.createTime = DateTime.Now;
                            ToBeAdded.createBy = User.Identity.GetUserName();
                            db.AssessmentReportGWP.Add(ToBeAdded);
                        }
                        db.SaveChanges();
                    }
                    transac.Commit();
                }
            }
            catch (Exception ex)
            {
                ex = CScommon.Exceptions.inner(ex);
                err = ex.Message;
                transac.Rollback();
                throw ex;
            }
        }

        public decimal GetFromExcel(string sour)
        {
            if (string.IsNullOrWhiteSpace(sour))
                return 0;
            if (!Decimal.TryParse(sour, NumberStyles.Any, CultureInfo.InvariantCulture.NumberFormat, out decimal Value))
                throw new Exception(sour + " not number");
            return Value;
        }
        
    }
}