using CarCareTracker.External.Interfaces;
using CarCareTracker.Models;
using LiteDB;
using Microsoft.AspNetCore.Mvc;
using CarCareTracker.Helper;
using CsvHelper;
using System.Globalization;

namespace CarCareTracker.Controllers
{
    public class VehicleController : Controller
    {
        private readonly ILogger<HomeController> _logger;
        private readonly IVehicleDataAccess _dataAccess;
        private readonly INoteDataAccess _noteDataAccess;
        private readonly IServiceRecordDataAccess _serviceRecordDataAccess;
        private readonly IGasRecordDataAccess _gasRecordDataAccess;
        private readonly ICollisionRecordDataAccess _collisionRecordDataAccess;
        private readonly ITaxRecordDataAccess _taxRecordDataAccess;
        private readonly IWebHostEnvironment _webEnv;
        private readonly IFileHelper _fileHelper;

        public VehicleController(ILogger<HomeController> logger, 
            IFileHelper fileHelper, 
            IVehicleDataAccess dataAccess, 
            INoteDataAccess noteDataAccess, 
            IServiceRecordDataAccess serviceRecordDataAccess, 
            IGasRecordDataAccess gasRecordDataAccess,
            ICollisionRecordDataAccess collisionRecordDataAccess,
            ITaxRecordDataAccess taxRecordDataAccess,
            IWebHostEnvironment webEnv)
        {
            _logger = logger;
            _dataAccess = dataAccess;
            _noteDataAccess = noteDataAccess;
            _fileHelper = fileHelper;
            _serviceRecordDataAccess = serviceRecordDataAccess;
            _gasRecordDataAccess = gasRecordDataAccess;
            _collisionRecordDataAccess = collisionRecordDataAccess;
            _taxRecordDataAccess = taxRecordDataAccess;
            _webEnv = webEnv;
        }
        [HttpGet]
        public IActionResult Index(int vehicleId)
        {
            var data = _dataAccess.GetVehicleById(vehicleId);
            return View(data);
        }
        [HttpGet]
        public IActionResult AddVehiclePartialView()
        {
            return PartialView("_VehicleModal", new Vehicle());
        }
        [HttpGet]
        public IActionResult GetEditVehiclePartialViewById(int vehicleId)
        {
            var data = _dataAccess.GetVehicleById(vehicleId);
            return PartialView("_VehicleModal", data);
        }
        [HttpPost]
        public IActionResult SaveVehicle(Vehicle vehicleInput)
        {
            try
            {
                //move image from temp folder to images folder.
                vehicleInput.ImageLocation = _fileHelper.MoveFileFromTemp(vehicleInput.ImageLocation, "images/");
                //save vehicle.
                var result = _dataAccess.SaveVehicle(vehicleInput);
                return Json(result);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error Saving Vehicle");
                return Json(false);
            }
        }
        [HttpPost]
        public IActionResult DeleteVehicle(int vehicleId)
        {
            //Delete all service records, gas records, notes, etc.
            var result = _gasRecordDataAccess.DeleteAllGasRecordsByVehicleId(vehicleId) &&
                _serviceRecordDataAccess.DeleteAllServiceRecordsByVehicleId(vehicleId) &&
                _collisionRecordDataAccess.DeleteAllCollisionRecordsByVehicleId(vehicleId) &&
                _taxRecordDataAccess.DeleteAllTaxRecordsByVehicleId(vehicleId) &&
                _noteDataAccess.DeleteNoteByVehicleId(vehicleId) &&
                _dataAccess.DeleteVehicle(vehicleId);
            return Json(result);
        }
        [HttpPost]
        public IActionResult SaveNoteToVehicle(Note newNote)
        {
            //check if there is already an existing note for this vehicle.
            var existingNote = _noteDataAccess.GetNoteByVehicleId(newNote.VehicleId);
            if (existingNote.Id != default)
            {
                newNote.Id = existingNote.Id;
            }
            var result = _noteDataAccess.SaveNoteToVehicleId(newNote);
            return Json(result);
        }
        [HttpGet]
        public IActionResult GetNoteByVehicleId(int vehicleId)
        {
            var existingNote = _noteDataAccess.GetNoteByVehicleId(vehicleId);
            if (existingNote.Id != default)
            {
                return Json(existingNote.NoteText);
            }
            return Json("");
        }
        #region "Bulk Imports"
        [HttpGet]
        public IActionResult GetBulkImportModalPartialView(string mode)
        {
            return PartialView("_BulkDataImporter", mode);
        }
        [HttpPost]
        public IActionResult ImportToVehicleIdFromCsv(int vehicleId, string mode, string fileName)
        {
            var fullFileName = _fileHelper.GetFullFilePath(fileName);
            if (vehicleId == default || string.IsNullOrWhiteSpace(fullFileName))
            {
                return Json(false);
            }
            try
            {
                using (var reader = new StreamReader(fullFileName))
                {
                    var config = new CsvHelper.Configuration.CsvConfiguration(System.Globalization.CultureInfo.InvariantCulture);
                    config.MissingFieldFound = null;
                    config.HeaderValidated = null;
                    using (var csv = new CsvReader(reader, config))
                    {
                        if (mode == "gas")
                        {
                            var records = csv.GetRecords<GasRecordImport>().ToList();
                            if (records.Any())
                            {
                                foreach (GasRecordImport gasRecordToInsert in records)
                                {
                                    var convertedGasRecord = new GasRecord()
                                    {
                                        VehicleId = vehicleId,
                                        Date = gasRecordToInsert.Date,
                                        Mileage = gasRecordToInsert.Odometer,
                                        Gallons = gasRecordToInsert.FuelConsumed,
                                        Cost = gasRecordToInsert.Cost
                                    };
                                    _gasRecordDataAccess.SaveGasRecordToVehicle(convertedGasRecord);
                                }
                            }
                        }
                    }
                }
                return Json(true);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error Occurred While Bulk Inserting");
                return Json(false);
            }
        }
        #endregion
        #region "Gas Records"
        [HttpGet]
        public IActionResult GetGasRecordsByVehicleId(int vehicleId)
        {
            var result = _gasRecordDataAccess.GetGasRecordsByVehicleId(vehicleId);
            var computedResults = new List<GasRecordViewModel>();
            int previousMileage = 0;
            //perform computation.
            for(int i = 0; i < result.Count; i++)
            {
                if (i > 0)
                {
                    var currentObject = result[i];
                    var deltaMileage = currentObject.Mileage - previousMileage;
                    computedResults.Add(new GasRecordViewModel()
                    {
                        Id = currentObject.Id,
                        VehicleId = currentObject.VehicleId,
                        Date = currentObject.Date.ToShortDateString(),
                        Mileage = currentObject.Mileage,
                        Gallons = currentObject.Gallons,
                        Cost = currentObject.Cost,
                        DeltaMileage = deltaMileage,
                        MilesPerGallon = deltaMileage / currentObject.Gallons,
                        CostPerGallon = (currentObject.Cost / currentObject.Gallons)
                    });
                } else
                {
                    computedResults.Add(new GasRecordViewModel()
                    {
                        Id = result[i].Id,
                        VehicleId = result[i].VehicleId,
                        Date = result[i].Date.ToShortDateString(),
                        Mileage = result[i].Mileage,
                        Gallons = result[i].Gallons,
                        Cost = result[i].Cost,
                        DeltaMileage = 0,
                        MilesPerGallon = 0,
                        CostPerGallon = (result[i].Cost / result[i].Gallons)
                    });
                }
                previousMileage = result[i].Mileage;
            }
            return PartialView("_Gas", computedResults);
        }
        [HttpPost]
        public IActionResult SaveGasRecordToVehicleId(GasRecordInput gasRecord)
        {
            gasRecord.Files = gasRecord.Files.Select(x => { return new UploadedFiles { Name = x.Name, Location = _fileHelper.MoveFileFromTemp(x.Location, "documents/") }; }).ToList();
            var result = _gasRecordDataAccess.SaveGasRecordToVehicle(gasRecord.ToGasRecord());
            return Json(result);
        }
        [HttpGet]
        public IActionResult GetAddGasRecordPartialView()
        {
            return PartialView("_GasModal", new GasRecordInput());
        }
        [HttpGet]
        public IActionResult GetGasRecordForEditById(int gasRecordId)
        {
            var result = _gasRecordDataAccess.GetGasRecordById(gasRecordId);
            var convertedResult = new GasRecordInput
            {
                Id = result.Id,
                Mileage = result.Mileage,
                VehicleId = result.VehicleId,
                Cost = result.Cost,
                Date = result.Date.ToShortDateString(),
                Files = result.Files,
                Gallons = result.Gallons
            };
            return PartialView("_GasModal", convertedResult);
        }
        [HttpPost]
        public IActionResult DeleteGasRecordById(int gasRecordId)
        {
            var result = _gasRecordDataAccess.DeleteGasRecordById(gasRecordId);
            return Json(result);
        }
        #endregion
        #region "Service Records"
        [HttpGet]
        public IActionResult GetServiceRecordsByVehicleId(int vehicleId)
        {
            var result = _serviceRecordDataAccess.GetServiceRecordsByVehicleId(vehicleId);
            return PartialView("_ServiceRecords", result);
        }
        [HttpPost]
        public IActionResult SaveServiceRecordToVehicleId(ServiceRecordInput serviceRecord)
        {
            //move files from temp.
            serviceRecord.Files = serviceRecord.Files.Select(x => { return new UploadedFiles { Name = x.Name, Location = _fileHelper.MoveFileFromTemp(x.Location, "documents/") }; }).ToList();
            var result = _serviceRecordDataAccess.SaveServiceRecordToVehicle(serviceRecord.ToServiceRecord());
            return Json(result);
        }
        [HttpGet]
        public IActionResult GetAddServiceRecordPartialView()
        {
            return PartialView("_ServiceRecordModal", new ServiceRecordInput());
        }
        [HttpGet]
        public IActionResult GetServiceRecordForEditById(int serviceRecordId)
        {
            var result = _serviceRecordDataAccess.GetServiceRecordById(serviceRecordId);
            //convert to Input object.
            var convertedResult = new ServiceRecordInput { Id = result.Id, 
                Cost = result.Cost, 
                Date = result.Date.ToShortDateString(), 
                Description = result.Description,
                Mileage = result.Mileage,
                Notes = result.Notes,
                VehicleId = result.VehicleId,
                Files = result.Files
            };
            return PartialView("_ServiceRecordModal", convertedResult);
        }
        [HttpPost] 
        public IActionResult DeleteServiceRecordById(int serviceRecordId)
        {
            var result = _serviceRecordDataAccess.DeleteServiceRecordById(serviceRecordId);
            return Json(result);
        }
        #endregion
        #region "Collision Records"
        [HttpGet]
        public IActionResult GetCollisionRecordsByVehicleId(int vehicleId)
        {
            var result = _collisionRecordDataAccess.GetCollisionRecordsByVehicleId(vehicleId);
            return PartialView("_CollisionRecords", result);
        }
        [HttpPost]
        public IActionResult SaveCollisionRecordToVehicleId(CollisionRecordInput collisionRecord)
        {
            //move files from temp.
            collisionRecord.Files = collisionRecord.Files.Select(x => { return new UploadedFiles { Name = x.Name, Location = _fileHelper.MoveFileFromTemp(x.Location, "documents/") }; }).ToList();
            var result = _collisionRecordDataAccess.SaveCollisionRecordToVehicle(collisionRecord.ToCollisionRecord());
            return Json(result);
        }
        [HttpGet]
        public IActionResult GetAddCollisionRecordPartialView()
        {
            return PartialView("_CollisionRecordModal", new CollisionRecordInput());
        }
        [HttpGet]
        public IActionResult GetCollisionRecordForEditById(int collisionRecordId)
        {
            var result = _collisionRecordDataAccess.GetCollisionRecordById(collisionRecordId);
            //convert to Input object.
            var convertedResult = new CollisionRecordInput
            {
                Id = result.Id,
                Cost = result.Cost,
                Date = result.Date.ToShortDateString(),
                Description = result.Description,
                Mileage = result.Mileage,
                Notes = result.Notes,
                VehicleId = result.VehicleId,
                Files = result.Files
            };
            return PartialView("_CollisionRecordModal", convertedResult);
        }
        [HttpPost]
        public IActionResult DeleteCollisionRecordById(int collisionRecordId)
        {
            var result = _collisionRecordDataAccess.DeleteCollisionRecordById(collisionRecordId);
            return Json(result);
        }
        #endregion
        #region "Tax Records"
        [HttpGet]
        public IActionResult GetTaxRecordsByVehicleId(int vehicleId)
        {
            var result = _taxRecordDataAccess.GetTaxRecordsByVehicleId(vehicleId);
            return PartialView("_TaxRecords", result);
        }
        [HttpPost]
        public IActionResult SaveTaxRecordToVehicleId(TaxRecordInput taxRecord)
        {
            //move files from temp.
            taxRecord.Files = taxRecord.Files.Select(x => { return new UploadedFiles { Name = x.Name, Location = _fileHelper.MoveFileFromTemp(x.Location, "documents/") }; }).ToList();
            var result = _taxRecordDataAccess.SaveTaxRecordToVehicle(taxRecord.ToTaxRecord());
            return Json(result);
        }
        [HttpGet]
        public IActionResult GetAddTaxRecordPartialView()
        {
            return PartialView("_TaxRecordModal", new TaxRecordInput());
        }
        [HttpGet]
        public IActionResult GetTaxRecordForEditById(int taxRecordId)
        {
            var result = _taxRecordDataAccess.GetTaxRecordById(taxRecordId);
            //convert to Input object.
            var convertedResult = new TaxRecordInput
            {
                Id = result.Id,
                Cost = result.Cost,
                Date = result.Date.ToShortDateString(),
                Description = result.Description,
                Notes = result.Notes,
                VehicleId = result.VehicleId,
                Files = result.Files
            };
            return PartialView("_TaxRecordModal", convertedResult);
        }
        [HttpPost]
        public IActionResult DeleteTaxRecordById(int taxRecordId)
        {
            var result = _taxRecordDataAccess.DeleteTaxRecordById(taxRecordId);
            return Json(result);
        }
        #endregion
        #region "Reports"
        [HttpGet]
        public IActionResult GetReportPartialView()
        {
            return PartialView("_Report");
        }
        [HttpGet]
        public IActionResult GetCostMakeUpForVehicle(int vehicleId, string startDate = "", string endDate = "")
        {
            var serviceRecords = _serviceRecordDataAccess.GetServiceRecordsByVehicleId(vehicleId);
            var gasRecords = _gasRecordDataAccess.GetGasRecordsByVehicleId(vehicleId);
            var collisionRecords = _collisionRecordDataAccess.GetCollisionRecordsByVehicleId(vehicleId);
            var taxRecords = _taxRecordDataAccess.GetTaxRecordsByVehicleId(vehicleId);
            if (!string.IsNullOrWhiteSpace(startDate) && 
                !string.IsNullOrWhiteSpace(endDate) &&
                DateTime.TryParse(startDate, out DateTime parsedStartDate) &&
                DateTime.TryParse(endDate, out DateTime parsedEndDate)
                )
            {
                parsedEndDate = parsedEndDate.AddDays(1).AddSeconds(-1);
                //if start and end dates are provided then we need to filter the data down.
                serviceRecords.RemoveAll(x => x.Date < parsedStartDate || x.Date > parsedEndDate);
                gasRecords.RemoveAll(x => x.Date < parsedStartDate || x.Date > parsedEndDate);
                collisionRecords.RemoveAll(x => x.Date < parsedStartDate || x.Date > parsedEndDate);
                taxRecords.RemoveAll(x => x.Date < parsedStartDate || x.Date > parsedEndDate);
            }
            var viewModel = new CostMakeUpForVehicle
            {
                ServiceRecordSum = serviceRecords.Sum(x => x.Cost),
                GasRecordSum = gasRecords.Sum(x => x.Cost),
                CollisionRecordSum = collisionRecords.Sum(x => x.Cost),
                TaxRecordSum = taxRecords.Sum(x => x.Cost)
            };
            return PartialView("_CostMakeUpReport", viewModel);
        }
        public IActionResult GetFuelCostByMonthByVehicle(int vehicleId, int year = 0)
        {
            var gasRecords = _gasRecordDataAccess.GetGasRecordsByVehicleId(vehicleId);
            if (year != default)
            {
                gasRecords.RemoveAll(x => x.Date.Year != year);
            }
            var groupedGasRecord = gasRecords.GroupBy(x => x.Date.Month).OrderBy(x=>x.Key).Select(x => new GasCostForVehicleByMonth {
                MonthName = CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(x.Key),
                Cost = x.Sum(y=>y.Cost)
            }).ToList();
            return PartialView("_GasCostByMonthReport", groupedGasRecord);
        }
        #endregion
    }
}