using System;
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>
        /// <param name="ayId"></param>
        /// <param name="userLocaleId"></param>
        /// <param name="ct"></param>
        /// <returns></returns>
        internal static async Task<string> GetLogForObject(long ayId, long userLocaleId, AyContext ct)
        {
            var items = await ct.Event
                                .Where(m => m.AyId == ayId)
                                .OrderBy(m => m.Created)
                                .ToListAsync();

            if (items.Count == 0)
            {
                return "";
            }

            AyaNova.Api.Controllers.LocaleController.LocaleSubsetParam param = new Api.Controllers.LocaleController.LocaleSubsetParam();
            param.LocaleId = userLocaleId;
            param.Keys.AddRange(new string[] { "CommonCreated", "Delete", "Modified", "Retrieved" });

            //TODO: add all the keys from all the events in AyaEvent
            //Attachment, Created instead of AttachmentCreate, or is it attached?

            var LT = await LocaleBiz.GetSubsetStatic(param);

            //Have list of locales and list of ops, now make it into a readable text display and return it
            System.Text.StringBuilder SbReturn = new System.Text.StringBuilder();
            foreach (Event ev in items)
            {
                SbReturn.AppendLine(BuildLogEntry(ev, LT));
            }

            return SbReturn.ToString();

        }

        internal static Task<string> GetLogForUser(long ayId, long userLocaleId, AyContext ct)
        {
            throw new NotImplementedException();
        }


        internal static string BuildLogEntry(Event ev, List<KeyValuePair<string, string>> lt)
        {

            return ":";
        }


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




    }//eoc

}//eons