using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;
using System.Threading.Tasks;

using SharedLibraryCore;
using IW4MAdmin.Plugins.Stats.Models;
using System.Collections.Generic;
using SharedLibraryCore.Database.Models;
using SharedLibraryCore.Configuration;
using SharedLibraryCore.Interfaces;
using IW4MAdmin.Plugins.Stats.Config;
using IW4MAdmin.Plugins.Stats.Helpers;

namespace IW4MAdmin.Plugins.Stats.Commands
{
    class MostKillsCommand : Command
    {
        private readonly IDatabaseContextFactory _contextFactory;

        public MostKillsCommand(CommandConfiguration config, ITranslationLookup translationLookup, IDatabaseContextFactory contextFactory) : base(config, translationLookup)
        {
            Name = "mostkills";
            Description = translationLookup["PLUGINS_STATS_COMMANDS_MOSTKILLS_DESC"];
            Alias = "mk";
            Permission = EFClient.Permission.User;

            _contextFactory = contextFactory;
        }

        public override async Task ExecuteAsync(GameEvent E)
        {
            var mostKills = await GetMostKills(StatManager.GetIdForServer(E.Owner), Plugin.Config.Configuration(), _contextFactory, _translationLookup);
            if (!E.Message.IsBroadcastCommand())
            {
                foreach (var stat in mostKills)
                {
                    E.Origin.Tell(stat);
                }
            }

            else
            {
                foreach (var stat in mostKills)
                {
                    E.Owner.Broadcast(stat);
                }
            }
        }

        public static async Task<IEnumerable<string>> GetMostKills(long? serverId, StatsConfiguration config, IDatabaseContextFactory contextFactory, ITranslationLookup translationLookup)
        {
            using (var ctx = contextFactory.CreateContext(enableTracking: false))
            {
                var dayInPast = DateTime.UtcNow.AddMonths(-config.MostKillsMaxInactivityDays);

                var iqStats = (from stats in ctx.Set<EFClientStatistics>()
                               join client in ctx.Clients
                               on stats.ClientId equals client.ClientId
                               join alias in ctx.Aliases
                               on client.CurrentAliasId equals alias.AliasId
                               where stats.ServerId == serverId
                               where client.Level != EFClient.Permission.Banned
                               where client.LastConnection >= dayInPast
                               orderby stats.Kills descending
                               select new
                               {
                                   alias.Name,
                                   stats.Kills
                               })
                               .Take(config.MostKillsClientLimit);

                var iqList = await iqStats.ToListAsync();

                return iqList.Select((stats, index) => translationLookup["PLUGINS_STATS_COMMANDS_MOSTKILLS_FORMAT"].FormatExt(index + 1, stats.Name, stats.Kills))
                    .Prepend(Utilities.CurrentLocalization.LocalizationIndex["PLUGINS_STATS_COMMANDS_MOSTKILLS_HEADER"]);
            }
        }
    }
}