using Microsoft.AspNetCore.Mvc;
using DigitalData.Modules.Logging;
using EnvelopeGenerator.Common;
using EnvelopeGenerator.Web.Services;
using static EnvelopeGenerator.Common.Constants;
using static EnvelopeGenerator.Web.Constants;

namespace EnvelopeGenerator.Web.Controllers
{
    public class DocumentController : Controller
    {
        private readonly DatabaseService database;
        private readonly LoggingService logging;
        private readonly Logger logger;
        private readonly ApiService api;

        public DocumentController(DatabaseService database, LoggingService logging, ApiService api)
        {
            this.database = database;
            this.logging = logging;
            this.logger = logging.LogConfig.GetLoggerFor(GetType().Name);
            this.api = api;
        }

        [HttpGet]
        [Route("api/document/{envelopeKey}")]
        public async Task<IActionResult> Get(string envelopeKey)
        {
            try
            {
                logger.Info("Handling file download.");

                // Validate Envelope Key
                EnvelopeResponse r = api.EnsureValidEnvelopeKey(envelopeKey);

                // Load document info
                var Request = ControllerContext.HttpContext.Request;
                var document = api.GetDocument(Request, envelopeKey);

                // Load the document from disk
                var bytes = await System.IO.File.ReadAllBytesAsync(document.Filepath);
                logger.Info("Serving file, size: [{0}]", bytes.Length);

                // Return the document as bytes
                return File(bytes, "application/octet-stream");
            }
            catch (IOException e)
            {
                logger.Error(e);
                return Problem(
                    statusCode: 500,
                    detail: e.Message,
                    type: ErrorType.ServerError.ToString());

            }
            catch (Exception e)
            {
                // Better error handling & reporting
                logger.Error(e);
                return Problem(
                    statusCode: 500,
                    detail: e.Message,
                    type: ErrorType.ServerError.ToString());

            }
        }

        [HttpPost]
        [Route("api/document/{envelopeKey}")]
        public async Task<IActionResult> Update(string envelopeKey)
        {
            try
            {
                logger.Info("Handling file update.");

                // Validate Envelope Key
                EnvelopeResponse r = api.EnsureValidEnvelopeKey(envelopeKey);

                // Load Document info
                var Request = ControllerContext.HttpContext.Request;
                var document = api.GetDocument(Request, envelopeKey);

                // Try to update the document with new data
                if (!await api.UpdateDocument(Request.Body, document.Filepath))
                {
                    throw new IOException("Document could not be saved to disk!");
                }

                // Add history entry 
                database.InsertHistoryEntry(new EnvelopeHistoryEntry()
                {
                    ActionDescription = "Dokument wurde signiert",
                    ActionDate = DateTime.Now,
                    ActionType = EnvelopeHistoryActionType.Signed,
                    EnvelopeId = r.Envelope.Id,
                    UserReference = r.Receiver.Email
                });

                return Ok();
            }
            catch (IOException e)
            {
                logger.Error(e);
                return Problem(
                    statusCode: 500,
                    detail: e.Message,
                    type: ErrorType.ServerError.ToString());

            }
            catch (Exception e)
            {
                // Better error handling & reporting
                logger.Error(e);
                return Problem(
                    statusCode: 500,
                    detail: e.Message,
                    type: ErrorType.ServerError.ToString());
            }
        }
    }
}