using Kerobot.Common;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;

namespace Kerobot.Modules.EntryRole
{
    /// <summary>
    /// Contains configuration data as well as per-guild timers for those awaiting role assignment.
    /// </summary>
    class GuildData
    {
        /// <summary>
        /// Lock on self.
        /// </summary>
        public Dictionary<ulong, DateTimeOffset> WaitingList { get; }

        /// <summary>
        /// Role to apply.
        /// </summary>
        public EntityName TargetRole { get; }
        /// <summary>
        /// Time to wait until applying the role, in seconds.
        /// </summary>
        public int WaitTime { get; }

        const int WaitTimeMax = 600; // 10 minutes

        public GuildData(JObject conf) : this(conf, new Dictionary<ulong, DateTimeOffset>()) { }

        public GuildData(JObject conf, Dictionary<ulong, DateTimeOffset> _waitingList)
        {
            WaitingList = _waitingList;

            var cfgRole = conf["Role"]?.Value<string>();
            if (string.IsNullOrWhiteSpace(cfgRole))
                throw new ModuleLoadException("Role value not specified.");
            try
            {
                TargetRole = new EntityName(cfgRole);
            }
            catch (ArgumentException)
            {
                throw new ModuleLoadException("Role config value was not properly specified to be a role.");
            }

            try
            {
                WaitTime = conf["WaitTime"].Value<int>();
            }
            catch (NullReferenceException)
            {
                throw new ModuleLoadException("WaitTime value not specified.");
            }
            catch (InvalidCastException)
            {
                throw new ModuleLoadException("WaitTime value must be a number.");
            }

            if (WaitTime > WaitTimeMax)
            {
                // don't silently correct it
                throw new ModuleLoadException($"WaitTime value may not exceed {WaitTimeMax} seconds.");
            }
            if (WaitTime < 0)
            {
                throw new ModuleLoadException("WaitTime value may not be negative.");
            }
        }

        public void WaitlistAdd(ulong userId)
        {
            lock (WaitingList) WaitingList.Add(userId, DateTimeOffset.UtcNow.AddSeconds(WaitTime));
        }

        public void WaitlistRemove(ulong userId)
        {
            lock (WaitingList) WaitingList.Remove(userId);
        }
    }
}