using System;
using System.Collections.Generic;

namespace SharpChat.Events {
    public class ChatEventDispatcher {
        private readonly object HandlersAccess = new();
        private readonly List<IChatEventHandler> Handlers = new();

        public void Subscribe(IChatEventHandler handler) {
            lock(HandlersAccess)
                if(!Handlers.Contains(handler))
                    Handlers.Add(handler);
        }

        public void Unsubscribe(IChatEventHandler handler) {
            lock(HandlersAccess)
                Handlers.Remove(handler);
        }

        public ChatEventInfo Dispatch(ChatEventInfo info) {
            lock(HandlersAccess)
                foreach(IChatEventHandler handler in Handlers)
                    handler.HandleEvent(info);

            return info;
        }

        public ChatEventInfo Dispatch(
            string eventType,
            long senderId,
            string senderName,
            Colour senderColour,
            int senderRank,
            string senderNickName,
            UserPermissions senderPerms,
            ChatEventData? eventData = null
        ) {
            return Dispatch(new ChatEventInfo(
                SharpId.Next(),
                eventType,
                DateTimeOffset.UtcNow,
                string.Empty,
                senderId,
                senderName,
                senderColour,
                senderRank,
                senderNickName,
                senderPerms,
                eventData
            ));
        }

        public ChatEventInfo Dispatch(
            string eventType,
            DateTimeOffset eventCreated,
            string channelName,
            UserInfo userInfo,
            ChatEventData? eventData = null
        ) {
            return Dispatch(new ChatEventInfo(
                SharpId.Next(),
                eventType,
                eventCreated,
                channelName,
                userInfo.UserId,
                userInfo.UserName,
                userInfo.Colour,
                userInfo.Rank,
                userInfo.NickName,
                userInfo.Permissions,
                eventData
            ));
        }

        public ChatEventInfo Dispatch(
            string eventType,
            DateTimeOffset eventCreated,
            ChannelInfo channelInfo,
            UserInfo userInfo,
            ChatEventData? eventData = null
        ) {
            return Dispatch(new ChatEventInfo(
                SharpId.Next(),
                eventType,
                eventCreated,
                channelInfo.Name,
                userInfo.UserId,
                userInfo.UserName,
                userInfo.Colour,
                userInfo.Rank,
                userInfo.NickName,
                userInfo.Permissions,
                eventData
            ));
        }

        public ChatEventInfo Dispatch(
            string eventType,
            string channelName,
            ChatEventInfo userInfo,
            ChatEventData? eventData = null
        ) {
            return Dispatch(new ChatEventInfo(
                SharpId.Next(),
                eventType,
                DateTimeOffset.UtcNow,
                channelName,
                userInfo.SenderId,
                userInfo.SenderName,
                userInfo.SenderColour,
                userInfo.SenderRank,
                userInfo.SenderNickName,
                userInfo.SenderPerms,
                eventData
            ));
        }

        public ChatEventInfo Dispatch(
            string eventType,
            string channelName,
            UserInfo userInfo,
            ChatEventData? eventData = null
        ) {
            return Dispatch(new ChatEventInfo(
                SharpId.Next(),
                eventType,
                DateTimeOffset.UtcNow,
                channelName,
                userInfo.UserId,
                userInfo.UserName,
                userInfo.Colour,
                userInfo.Rank,
                userInfo.NickName,
                userInfo.Permissions,
                eventData
            ));
        }

        public ChatEventInfo Dispatch(
            string eventType,
            ChannelInfo channelInfo,
            UserInfo userInfo,
            ChatEventData? eventData = null
        ) {
            return Dispatch(eventType, channelInfo.Name, userInfo, eventData);
        }

        public ChatEventInfo Dispatch(
            string eventType,
            UserInfo userInfo,
            ChatEventData? eventData = null
        ) {
            return Dispatch(eventType, string.Empty, userInfo, eventData);
        }

        public ChatEventInfo Dispatch(
            string eventType,
            ChatEventInfo userInfo,
            ChatEventData? eventData = null
        ) {
            return Dispatch(eventType, string.Empty, userInfo, eventData);
        }
    }
}