using System;
using System.Collections.Generic;
using System.Web.Http;
using log4net;

namespace bsmd.AIS2Service
{
    public class SLRController : ApiController
    {
        private static readonly ILog _log = LogManager.GetLogger(typeof(SLRController));

        [HttpGet]
        public IEnumerable<ShipLocationReport> Get([FromUri] int? id)
        {
            if (!id.HasValue) return null;
            List<ShipLocationReport> result = AISManager.SQLiteStorage.GetShipLocationReports(id.Value);

            int classBReportCnt = result.RemoveAll(x => AISManager.SitRep.ContainsKey(x.MMSI) && (AISManager.SitRep[x.MMSI].IsClassB ?? false));
            _log.DebugFormat("removed {0} class B SLR reports from list"); // tut des?

            // auch alles entfernen was "abgelaufen" ist und nicht im SitRep enthalten ist

            Dictionary<int, List<ShipLocationReport>> mmsiDict = new Dictionary<int, List<ShipLocationReport>>();
            foreach(ShipLocationReport report in result) {
                if (!mmsiDict.ContainsKey(report.MMSI)) mmsiDict[report.MMSI] = new List<ShipLocationReport>();
                mmsiDict[report.MMSI].Add(report);
                if (AISManager.SitRep.ContainsKey(report.MMSI))
                {
                    report.Destination = AISManager.SitRep[report.MMSI].Destination;
                    report.Name = AISManager.SitRep[report.MMSI].Name;
                    report.NavStatus = AIS_PosReport.GetNavStatus(AISManager.SitRep[report.MMSI].NavStatus);
                    report.IMO = AISManager.SitRep[report.MMSI].IMO;
                }
            }

            // determine "state" of vessel through alarm comparison. Possible values are:
            // 0 = stationary (= equals)
            // 1 = incoming
            // 2 = outgoing
            // 3 = expired

            foreach(int key in mmsiDict.Keys)
            {
                bool expired = true;
                DateTime? lastDate= null;
                bool? incoming = null;

                // first run through alarm list to determine state
                foreach(ShipLocationReport slr in mmsiDict[key])
                {
                    if((DateTime.Now - slr.Timestamp_Last).TotalHours < Properties.Settings.Default.AutoAlarmExpiryHours)  expired = false;
                    if (lastDate == null)
                    {
                        lastDate = slr.Timestamp_Last;
                    }
                    else
                    {
                        incoming = slr.Timestamp_Last < lastDate;
                    }
                }

                // second run through alarm list to set state flag in all entries
                foreach (ShipLocationReport slr in mmsiDict[key])
                {
                    if (expired)
                    {
                        slr.VoyageDirection = 3;
                    }
                    else if (incoming.HasValue)
                    {
                        if (incoming.Value) { slr.VoyageDirection = 1; }
                        else { slr.VoyageDirection = 2; }
                    }
                    else
                    {
                        slr.VoyageDirection = 0; // stationary / no comparison value
                    }
                }
            }

            return result;
        }
    }
}