using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Xamarin.Essentials;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using XF.Material.Forms.UI.Dialogs;


namespace PRS.Mobile
{
    public delegate void ConsignmentSavedEvent();

    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class ConsignmentCompletionPage 
    {
        public event ConsignmentSavedEvent OnConsignmentSaved;
        List<POItemShell> listReceived = new List<POItemShell>();
        int shortSupplyIssues = 0;
        int extraSupplyIssues = 0;
        int count = 1;
        Guid consignmentID = Guid.Empty;
        string consignmentNumber = "";
        Dictionary<Image, Document> imagesDocuments = new Dictionary<Image, Document>();
        public ConsignmentCompletionPage(List<POItemShell> _listReceived, Guid _consignmentID, string _consignmentNumber)
        {
            InitializeComponent();
            consignmentID = _consignmentID;
            consignmentNumber = _consignmentNumber;
            listReceived = _listReceived;
            LoadScreen();
        }

        private void LoadScreen()
        {
            try
            {
                titleLbl.Text = "Consignment " + consignmentNumber;
                totalReceivedNumberLbl.Text = listReceived.Count.ToString();
                string text = new Client<Consignment>().Query(
                    new Filter<Consignment>(x => x.ID).IsEqualTo(consignmentID),
                    new Columns<Consignment>(ColumnTypeFlags.None).Add(x => x.Description)
                    ).Rows.FirstOrDefault().Values[0].ToString();

                List<POItemShell> issuesList = new List<POItemShell>();
                foreach (POItemShell item in listReceived)
                {
                    if (item.Description.Contains("due to short supply"))
                    {
                        shortSupplyIssues++;
                        issuesList.Add(item);
                    }
                    else if (item.Description.Contains("Purchase Order Item Line split due to extra"))
                    {
                        extraSupplyIssues++;
                        issuesList.Add(item);
                    }
                }
                if (issuesList.Count > 0)
                {
                    foreach (POItemShell item in issuesList)
                    {
                        if (item.Description.Contains("due to short supply"))
                        {
                            text = text + System.Environment.NewLine + count + ". " + item.Description;
                            count++;
                        }
                        else if (item.Description.Contains("Purchase Order Item Line split due to extra"))
                        {
                            text = text + System.Environment.NewLine + count + ". " + item.Description;
                            count++;
                        }
                    }
                }
                descriptionLbl.Text = text;
            }
            catch { }
        }
        async void TakePhoto_Clicked(object sender, EventArgs e)
        {
            TakeAPhoto();
        }
        async void ChooseImage_Clicked(object sender, EventArgs e)
        {
            ChooseAPhoto();
        }
        private async void ConfirmBtn_Clicked(object sender, EventArgs e)
        {
            try
            {
                if (photosFrame.BorderColor == Color.Red)
                {
                    return;
                }
                else
                {
                    using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Saving"))
                    {
                        Consignment consignment = new Consignment()
                        {
                            ID = consignmentID,
                            Number = consignmentNumber
                        };
                        consignment.ActualWarehouseArrival = DateTime.Now;
                        consignment.Description = descriptionLbl.Text;
                        consignment.Employee.ID = App.Data.Me.ID;

                        SaveConsignment(consignment);

                        await DisplayAlert("Success", "Receival saved for " + consignmentNumber, "OK");

                        OnConsignmentSaved?.Invoke();
                    }
                    Navigation.PopAsync();
                }
            }
            catch (Exception ex)
            {
                OnConsignmentSaved?.Invoke();
            }
        }

        private void SaveConsignment(Consignment consignment)
        {
            try 
            {
                new Client<Consignment>().Save(consignment, "Updated from mobile device");
            }
            catch (Exception ex) 
            {
                InABox.Mobile.MobileLogging.Log(ex);
                SaveConsignment(consignment);
            }
        }

        //Note that photos are saved as they are taken, to avoid saving a long list of photos which some devices can't handle
        //PurchaseOrderDocuments, StockMovementBatch and StockMovementBatchDocuments are saved in ConsignmentStore
        #region Photos
        private async void TakeAPhoto()
        {
            try
            {
                var file = await MediaPicker.CapturePhotoAsync();

                if (file == null)
                    return;

                using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Adding Photo"))
                {
                    Image img = null;
                    var memoryStream = new MemoryStream();
                    using (var stream = await file.OpenReadAsync())
                        await stream.CopyToAsync(memoryStream);
                    var data = memoryStream.ToArray();

                    Document doc = new Document()
                    {
                        FileName = file.FileName,
                        Data = data,
                        CRC = CoreUtils.CalculateCRC(data),
                        TimeStamp = DateTime.Now
                    };

                    ImageSource src = ImageSource.FromStream(() => new MemoryStream(data));
                    img = new Image();
                    img.HeightRequest = 150;
                    img.WidthRequest = 150;
                    img.Aspect = Aspect.AspectFit;
                    img.Source = src;
                    img.GestureRecognizers.Add(new TapGestureRecognizer
                    {
                        Command = new Command(OnTap),
                        CommandParameter = src,
                        NumberOfTapsRequired = 1
                    });

                    doc = SavePhoto(doc);

                    SaveConsignmentDocument(doc.ID);

                    imagesDocuments.Add(img, doc);

                    //file.Dispose();
                    if (img != null)
                    {
                        Device.BeginInvokeOnMainThread(() =>
                        {
                            ImageScroller.IsVisible = true;
                            images.Children.Add(img);
                            UpdateColours();
                        });
                    }
                }
            }
            catch (Exception ex)
            {
                DisplayAlert("Error saving - please try again", ex.Message, "OK");
            }
        }

        private Document SavePhoto(Document doc)
        {
            try
            {
                new Client<Document>().Save(doc, "Saved on Mobile Receivals Module");
                return doc;
            }
            catch (Exception ex)
            {
                InABox.Mobile.MobileLogging.Log(ex);
                return SavePhoto(doc);
            }
        }
        private async void ChooseAPhoto()
        {
            try
            {

                var file = await MediaPicker.CapturePhotoAsync();
                if (file == null)
                    return;

                using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Adding Photo"))
                {
                    Image img = null;
                    var memoryStream = new MemoryStream();
                    using (var stream = await file.OpenReadAsync())
                        await stream.CopyToAsync(memoryStream);
                    var data = memoryStream.ToArray();

                    Document doc = new Document()
                    {
                        FileName = Path.GetFileName(file.FileName),
                        Data = data,
                        CRC = CoreUtils.CalculateCRC(data),
                        TimeStamp = DateTime.Now
                    };

                    ImageSource src = ImageSource.FromStream(() => new MemoryStream(data));
                    img = new Image();
                    img.HeightRequest = 150;
                    img.WidthRequest = 150;
                    img.Aspect = Aspect.AspectFit;
                    img.Source = src;
                    img.GestureRecognizers.Add(new TapGestureRecognizer
                    {
                        Command = new Command(OnTap),
                        CommandParameter = src,
                        NumberOfTapsRequired = 1
                    });

                    doc = SavePhoto(doc);

                    SaveConsignmentDocument(doc.ID);

                    imagesDocuments.Add(img, doc);

                    //file.Dispose();
                    if (img != null)
                    {
                        Device.BeginInvokeOnMainThread(() =>
                        {
                            ImageScroller.IsVisible = true;
                            images.Children.Add(img);
                            UpdateColours();
                        });
                    }
                }
            }
            catch (Exception ex)
            {
                DisplayAlert("Error saving - please try again", ex.Message, "OK");
            }
        }
        private void SaveConsignmentDocument(Guid docid)
        {
            Task.Run(() =>
            {
                try
                {
                    ConsignmentDocument consignmentDocument = new ConsignmentDocument();
                    consignmentDocument.DocumentLink.ID = docid;
                    consignmentDocument.EntityLink.ID = consignmentID;
                    new Client<ConsignmentDocument>().Save(consignmentDocument, "Saved on Mobile Receivals Module");
                }
                catch (Exception ex)
                {
                    InABox.Mobile.MobileLogging.Log(ex);
                    SaveConsignmentDocument(docid);
                }
            });
        }
        private void OnTap(object obj)
        {
            try
            {
                ImageViewerPage viewer = new ImageViewerPage(obj as ImageSource, () => DeleteImage(obj));
                Navigation.PushAsync(viewer);
            }
            catch { }
        }

        private void DeleteImage(object obj)
        {
            Image img = imagesDocuments.Keys.FirstOrDefault(x => x.Source.Equals(obj as ImageSource));
            DeleteDocuments(imagesDocuments[img].ID);
            imagesDocuments.Remove(img);
            Device.BeginInvokeOnMainThread(() =>
            {
                images.Children.Clear();
                if (imagesDocuments.Count > 0)
                {
                    foreach (Image image in imagesDocuments.Keys)
                    {
                        images.Children.Add(image);
                    }
                }

                UpdateColours();
            });
        }

        private void DeleteDocuments(Guid docid)
        {
            Task.Run(() =>
            {
                try
                {
                    Document doc = new Document { ID = docid };
                    new Client<Document>().Delete(doc, "User removed unwanted photo on mobile receivals module");
                    CoreTable table = new Client<ConsignmentDocument>().Query(new Filter<ConsignmentDocument>(x => x.DocumentLink.ID).IsEqualTo(docid),
                        new Columns<ConsignmentDocument>(ColumnTypeFlags.None).Add(x => x.ID));
                    if (table.Rows.Any())
                    {
                        ConsignmentDocument consignmentDocument = table.Rows.FirstOrDefault().ToObject<ConsignmentDocument>();
                        new Client<ConsignmentDocument>().Delete(consignmentDocument, "User removed unwanted photo on mobile receivals module");
                    }
                }
                catch (Exception ex)
                {
                    InABox.Mobile.MobileLogging.Log(ex);
                    DeleteDocuments(docid);
                }
            });
        }

        #endregion

        private void UpdateColours()
        {
            if (imagesDocuments.Count > 0)
                photosFrame.BorderColor = Color.Gray;
            else
                photosFrame.BorderColor = Color.Red;
        }
    }
}