using System.Collections.Concurrent;
using HermesSocketLibrary.db;
using HermesSocketLibrary.Requests.Messages;
using HermesSocketServer.Models;
using HermesSocketServer.Store;

namespace HermesSocketServer.Services
{
    public class ChannelManager
    {
        private readonly IStore<string, User> _users;
        private readonly Database _database;
        private readonly IStore<string, TTSVoice> _voices;
        private readonly ServerConfiguration _configuration;
        private readonly Serilog.ILogger _logger;
        private readonly IDictionary<string, Channel> _channels;
        private readonly object _lock;

        public ChannelManager(IStore<string, User> users, Database database, IStore<string, TTSVoice> voices, ServerConfiguration configuration, Serilog.ILogger logger)
        {
            _users = users;
            _database = database;
            _voices = voices;
            _configuration = configuration;
            _logger = logger;
            _channels = new ConcurrentDictionary<string, Channel>();
            _lock = new object();
        }


        public async Task<Channel?> Add(string userId)
        {
            var user = _users.Get(userId);
            if (user == null)
                return null;

            return await Task.Run(() =>
            {
                lock (_lock)
                {
                    if (_channels.TryGetValue(userId, out var channel))
                        return Task.FromResult<Channel?>(channel);

                    var actionTable = _configuration.Database.Tables["Action"];
                    var chatterTable = _configuration.Database.Tables["Chatter"];
                    var connectionTable = _configuration.Database.Tables["Connection"];
                    //var chatterGroupTable = _configuration.Database.Tables["ChatterGroup"];
                    var groupTable = _configuration.Database.Tables["Group"];
                    var groupPermissionTable = _configuration.Database.Tables["GroupPermission"];
                    var policyTable = _configuration.Database.Tables["Policy"];
                    var redemptionTable = _configuration.Database.Tables["Redemption"];
                    var ttsFilterTable = _configuration.Database.Tables["TtsFilter"];
                    var ttsVoiceStateTable = _configuration.Database.Tables["VoiceState"];

                    var chatters = new ChatterStore(userId, chatterTable, _database, _logger);
                    var connections = new ConnectionStore(userId, connectionTable, _database, _logger);
                    var groups = new GroupStore(userId, groupTable, _database, _configuration, _logger);
                    var groupPermissions = new GroupPermissionStore(userId, groupPermissionTable, groups, _database, _logger);
                    var policies = new PolicyStore(userId, policyTable, groups, _database, _logger);
                    var filters = new TTSFilterStore(userId, ttsFilterTable, _database, _logger);
                    var actions = new ActionStore(userId, actionTable, _database, _logger);
                    var redemptions = new RedemptionStore(userId, redemptionTable, actions, _database, _logger);
                    var voiceStates = new VoiceStateStore(userId, ttsVoiceStateTable, _voices, _database, _logger);

                    channel = new Channel()
                    {
                        Id = userId,
                        User = user,
                        Chatters = chatters,
                        Connections = connections,
                        Groups = groups,
                        GroupPermissions = groupPermissions,
                        Policies = policies,
                        Filters = filters,
                        Actions = actions,
                        Redemptions = redemptions,
                        VoiceStates = voiceStates,
                    };

                    Task.WaitAll([
                        channel.Actions.Load(),
                        channel.Chatters.Load(),
                        channel.Connections.Load(),
                        channel.Groups.Load(),
                        channel.Filters.Load(),
                        channel.VoiceStates.Load(),
                    ]);

                    Task.WaitAll([
                        channel.GroupPermissions.Load(),
                        channel.Policies.Load(),
                        channel.Redemptions.Load(),
                    ]);

                    _channels.Add(userId, channel);
                    return Task.FromResult<Channel?>(channel);
                }
            });
        }

        public Channel? Get(string channelId)
        {
            if (_channels.TryGetValue(channelId, out var channel))
                return channel;
            return null;
        }

        public async Task Save(string userId)
        {
            if (!_channels.TryGetValue(userId, out var channel))
                return;

            _logger.Debug($"Saving channel data to database [channel id: {channel.Id}][channel name: {channel.User.Name}]");
            await Task.WhenAll([
                channel.Chatters.Save(),
                channel.Connections.Save(),
                channel.Groups.Save(),
                channel.GroupPermissions.Save(),
                channel.Policies.Save(),
                channel.Filters.Save(),
                channel.Actions.Save(),
                channel.Redemptions.Save(),
                channel.VoiceStates.Save(),
            ]);
        }

        public async Task Save()
        {
            foreach (var channel in _channels.Values)
            {
                _logger.Debug($"Saving channel data to database [channel id: {channel.Id}][channel name: {channel.User.Name}]");
                var genericTablesTask = Task.WhenAll([
                    channel.Chatters.Save(),
                    channel.Connections.Save(),
                    channel.Filters.Save(),
                    channel.VoiceStates.Save(),
                ]).ConfigureAwait(false);

                await Task.WhenAll([
                    channel.Actions.Save(),
                    channel.Groups.Save(),
                ]).ConfigureAwait(false);

                await Task.WhenAll([
                    channel.GroupPermissions.Save(),
                    channel.Policies.Save(),
                    channel.Redemptions.Save(),
                ]).ConfigureAwait(false);

                await genericTablesTask;
            }
        }
    }
}