using System;
using System.Text;
using System.Linq;
using System.Threading.Tasks;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using AyaNova.Models;
using AyaNova.Util;


namespace AyaNova.Biz
{
    internal static class EventLogProcessor
    {
        private static ILogger log = AyaNova.Util.ApplicationLogging.CreateLogger("EventLogProcessor");

        /// <summary>
        /// Add an entry to the log
        /// </summary>      
        /// <param name="newEvent"></param>
        /// <param name="ct"></param>
        /// <returns></returns>
        internal static void AddEntry(Event newEvent, AyContext ct)
        {
            ct.Event.Add(newEvent);
            ct.SaveChanges();
        }


        /// <summary>
        /// Handle delete
        /// remove all prior entries for object, add one deleted entry
        /// </summary>             
        /// <param name="userId"></param>
        /// <param name="ayType"></param>
        /// <param name="ayId"></param>
        /// <param name="textra"></param>
        /// <param name="ct"></param>
        internal static void DeleteObject(long userId, AyaType ayType, long ayId, string textra, AyContext ct)
        {
            ct.Database.ExecuteSqlCommand($"delete from aevent where aytype = {ayType} and ayid={ayId}");
            ct.Event.Add(new Event(userId, ayId, ayType, AyaEvent.Deleted, textra));
            ct.SaveChanges();
        }

        /// <summary>
        /// Get the event log for a specified object
        /// </summary>
        internal static async Task<AyaNova.Api.Controllers.EventLogController.ObjectEventLogItem[]> GetLogForObject(AyaNova.Api.Controllers.EventLogController.EventLogOptions opt, AyContext ct)
        {
            //This is also an example of conditional where statements 

            //Set up the query
            var q = ct.Event.Select(m => m);


            q = q.Where(m => m.AyId == opt.AyId);

            if (opt.StartDate != null)
                q = q.Where(m => m.Created > opt.StartDate);

            if (opt.EndDate != null)
                q = q.Where(m => m.Created < opt.EndDate);

            q = q.OrderBy(m => m.Created);

            //Execute the query
            var EventItems = await q.ToArrayAsync();

            //convert the Event array to the correct return type array
            var ret = EventItems.Select(m => new AyaNova.Api.Controllers.EventLogController.ObjectEventLogItem()
            {
                Date = m.Created,
                UserId = m.OwnerId,
                Event = m.AyEvent,
                Textra = m.Textra
            }).ToArray();

            return ret;

        }




        internal static Task<string> GetLogForUser(AyaNova.Api.Controllers.EventLogController.EventLogOptions opt, AyContext ct)
        {
            throw new NotImplementedException();
        }



        internal static string BuildLogEntry(bool userFormat, Event ev, List<KeyValuePair<string, string>> lt)
        {
            StringBuilder S = new StringBuilder();

            //Object format:
            //DateTime, UserId, ActionNumber, Textra

            //User format:
            //DateTime, ObjectType, ObjectId, ActionNumber, Textra

            ev


            switch (ev.AyEvent)
            {
                case AyaEvent.Created:

                    break;
            }

            return ":";
        }


        /////////////////////////////////////////////////////////////////////




    }//eoc

}//eons