using EnvelopeGenerator.Common;
using EnvelopeGenerator.Common.My.Resources;
using EnvelopeGenerator.Web.Services;
using Microsoft.Extensions.Primitives;

namespace EnvelopeGenerator.Web.Handler
{
    public class FileHandler
    {
        public async static Task<IResult> HandleFile(HttpContext ctx, DatabaseService database, LoggingService logging)
        {
            
            var logger = logging.LogConfig.GetLogger("FileHandler");
            string envelopeKey = (string)ctx.Request.RouteValues["envelopeKey"];

            logger.Info("Downloading file with EnvelopeKey [{0}]", envelopeKey);

            Tuple<string, string> result = Helpers.DecodeEnvelopeReceiverId(envelopeKey);
            logger.Info("EnvelopeUUID: [{0}]", result.Item1);
            logger.Info("ReceiverSignature: [{0}]", result.Item2);

            EnvelopeResponse response = database.LoadEnvelope(envelopeKey);
            var envelope = response.Envelope;
            logger.Info("Envelope [{0}] loaded", envelope.Id);
            logger.Info("Contains [{0}] documents", envelope.Documents.Count);
            logger.Info("Contains [{0}] receivers", envelope.Receivers.Count);

            int documentId = getDocumentIndex(ctx);
            var document = getDocument(envelope, documentId);

            try
            {
                var bytes = await File.ReadAllBytesAsync(document.Filepath);
                logger.Info("Serving file, size: [{0}]", bytes.Length);

                return Results.File(bytes);
            }
            catch (Exception e)
            {
                logger.Error(e);
                return Results.Problem();
                
            }     
        }

        private static int getDocumentIndex(HttpContext ctx)
        {
            int documentId = 0;
            StringValues documentIndexString;
            if (ctx.Request.Query.TryGetValue("index", out documentIndexString))
            {
                int.TryParse(documentIndexString.First(), out documentId);
            }

            return documentId;
        }

        private static EnvelopeDocument getDocument(Common.Envelope envelope, int documentId)
        {
            var document = envelope.Documents.First();
            if (documentId > 0)
            {
                var documentById = envelope.Documents.
                    Where(d => d.Id == documentId).
                    FirstOrDefault();

                if (documentById != null)
                {
                    document = documentById;
                }
            }

            return document;
        }

        public static Task<IResult> HandleGetData(HttpContext ctx, DatabaseService database, LoggingService logging)
        {
            var logger = logging.LogConfig.GetLogger("FileHandler");
            string envelopeKey = (string)ctx.Request.RouteValues["envelopeKey"];

            logger.Info("Fetching data for envelope with EnvelopeKey [{0}]", envelopeKey);

            Tuple<string, string> result = Helpers.DecodeEnvelopeReceiverId(envelopeKey);
            logger.Info("EnvelopeUUID: [{0}]", result.Item1);
            logger.Info("ReceiverSignature: [{0}]", result.Item2);

            var response = database.LoadEnvelope(envelopeKey);
            var envelope = response.Envelope;
            logger.Info("Envelope [{0}] loaded", envelope.Id);
            logger.Info("Contains [{0}] documents", envelope.Documents.Count);
            logger.Info("Contains [{0}] receivers", envelope.Receivers.Count);

            
            return Task.FromResult(Results.Json(response));
        }

    }
}