using PWAPPv2.Source.API;
using PWAPPv2.Source.DataObjects;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Mail;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Forms;

namespace PWAPPv2.Source.Attachments
{
    public class FileHandler
    {

        public List<string> SupportedImageTypes;
        public List<string> SupportedVideoTypes;
        public List<string> SupportedDocumentTypes;

        public List<Source.DataObjects.Attachment> Attachments;

        private APICredentials credentials;

        private string filterString;

        public FileHandler(APICredentials apiCredentials)
        {
            credentials = apiCredentials;
            SupportedImageTypes = new List<string>();
            SupportedVideoTypes = new List<string>();
            SupportedDocumentTypes = new List<string>();

            SupportedImageTypes.Clear();
            SupportedImageTypes.Add(".jpeg");
            SupportedImageTypes.Add(".jpg");
            SupportedImageTypes.Add(".png");
            //SupportedImageTypes.Add(".tiff");

            SupportedDocumentTypes.Clear();
            SupportedDocumentTypes.Add(".pdf");
            
            Attachments = new List<Source.DataObjects.Attachment>();

            filterString = "Attachment files (";
            string filter = "|";
            foreach (string imageType in SupportedImageTypes)
            {
                filterString += "*" + imageType + ",";
                filter += "*" + imageType + ";";
            }
            foreach (string videoType in SupportedVideoTypes)
            {
                filterString += "*" + videoType + ",";
                filter += "*" + videoType + ";";
            }
            foreach (string documentType in SupportedDocumentTypes)
            {
                filterString += "*" + documentType + ",";
                filter += "*" + documentType + ";";
            }
            filterString = filterString.Remove(filterString.Length - 1, 1);
            filterString += ")" + filter;

        }

        public void AddFile()
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Multiselect = true;
            

            openFileDialog.Filter = filterString;
            openFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures);

            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                foreach (string filename in openFileDialog.FileNames)
                {
                    if(SupportedImageTypes.Contains(Path.GetExtension(filename)))
                    {
                        try
                        {
                            Attachments.Add(new DataObjects.Attachment(credentials, new DataObjects.PWImage(filename)));
                        }
                        catch (NullReferenceException)
                        { }
                    }
                    if(SupportedDocumentTypes.Contains(Path.GetExtension(filename)))
                    {
                        try
                        {
                            Attachments.Add(new Source.DataObjects.Attachment(credentials, new Source.DataObjects.PWPdf(filename)));
                        }
                        catch(NullReferenceException) { }
                    }
                }
            }
        }

        public void SendFilesAsAttachments(APIConnection connection, string token)
        {
            if(Attachments.Count <= 0)
            {
                return;
            }
            foreach(DataObjects.Attachment attachment in Attachments)
            {
                PWAttachment att = null;
                if (attachment.image != null)
                {
                    att = AttachmentFactory.BuildAttachment(credentials, token, attachment.image);

                }
                else if (attachment.pdf != null)
                {
                    att = AttachmentFactory.BuildAttachment(credentials, token, attachment.pdf);
                }

                if (att == null)
                {
                    throw new AttachmentTypeNotYetSupportedException();
                }
                string json = JsonSerializer.Serialize(att);
                connection.SendPostWithCredsInHeader("api/PWAttachment", json);
            }
        }

    }

    public class AttachmentTypeNotYetSupportedException : Exception { }
}