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

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

        public HistoryController(DatabaseService database, LoggingService logging, ApiService api)
        {
            this.database = database;
            this.logging = logging;
            this.logger = logging.LogConfig.GetLoggerFor("HistoryController");
            this.api = api;
        }

        [HttpPost]
        [Route("api/history/{envelopeKey}")]
        public IActionResult Create(HttpContext ctx, string envelopeKey)
        {
            try
            {
                api.EnsureValidEnvelopeKey(envelopeKey);
                EnvelopeResponse r = database.LoadEnvelope(envelopeKey);
                var receiver = r.Envelope.Receivers.Where(receiver => receiver.Id == r.ReceiverId).SingleOrDefault();

                if (receiver == null)
                {
                    return BadRequest();
                }

                string actionTypeString = EnsureValidQueryField(ctx.Request, "actionType");
                string actionDescription = EnsureValidQueryField(ctx.Request, "actionDescription");

                if (!Enum.TryParse<EnvelopeHistoryActionType>(actionTypeString, out var actionType))
                {
                    return BadRequest();
                };

                database.InsertHistoryEntry(new EnvelopeHistoryEntry()
                {
                    ActionDescription = actionDescription,
                    ActionDate = DateTime.Now,
                    ActionType = actionType,
                    EnvelopeId = r.Envelope.Id,
                    UserReference = receiver.Email
                });

                return Json(new { });
            }
            catch (Exception e)
            {
                logger.Error(e);
                return Problem(statusCode: 500);          
            }      
        }

        private string EnsureValidQueryField(HttpRequest request, string fieldName)
        {
            if (request.Query.TryGetValue(fieldName, out StringValues documentIndexString))
            {
                try
                {
                    return documentIndexString.First();
                }
                catch (Exception e)
                {
                    throw new ArgumentNullException(fieldName, e);
                }
            }
            else
            {
                throw new ArgumentNullException(fieldName);
            }
        }
    }
}