using System;
using System.IO;

namespace MinecraftClient.ChatBots
{
    /// <summary>
    /// This bot saves the received messages in a text file.
    /// </summary>

    public class ChatLog : ChatBot
    {
        public enum MessageFilter { AllText, AllMessages, OnlyChat, OnlyWhispers, OnlyInternalCommands };
        private readonly bool dateandtime;
        private readonly bool saveOther = true;
        private readonly bool saveChat = true;
        private readonly bool savePrivate = true;
        private readonly bool saveInternal = true;
        private readonly string logfile;
        private readonly object logfileLock = new();

        /// <summary>
        /// This bot saves the messages received in the specified file, with some filters and date/time tagging.
        /// </summary>
        /// <param name="file">The file to save the log in</param>
        /// <param name="filter">The kind of messages to save</param>
        /// <param name="AddDateAndTime">Add a date and time before each message</param>

        public ChatLog(string file, MessageFilter filter, bool AddDateAndTime)
        {
            dateandtime = AddDateAndTime;
            logfile = file;
            switch (filter)
            {
                case MessageFilter.AllText:
                    saveOther = true;
                    savePrivate = true;
                    saveChat = true;
                    break;
                case MessageFilter.AllMessages:
                    saveOther = false;
                    savePrivate = true;
                    saveChat = true;
                    break;
                case MessageFilter.OnlyChat:
                    saveOther = false;
                    savePrivate = false;
                    saveChat = true;
                    break;
                case MessageFilter.OnlyWhispers:
                    saveOther = false;
                    savePrivate = true;
                    saveChat = false;
                    break;
                case MessageFilter.OnlyInternalCommands:
                    saveOther = false;
                    savePrivate = false;
                    saveChat = false;
                    saveInternal = true;
                    break;
            }
            if (String.IsNullOrEmpty(file) || file.IndexOfAny(Path.GetInvalidPathChars()) >= 0)
            {
                LogToConsoleTranslated("bot.chatLog.invalid_file", file);
                UnloadBot();
            }
        }

        public static MessageFilter str2filter(string filtername)
        {
            return Settings.ToLowerIfNeed(filtername) switch
            {
#pragma warning disable format // @formatter:off
                "all"       =>  MessageFilter.AllText,
                "messages"  =>  MessageFilter.AllMessages,
                "chat"      =>  MessageFilter.OnlyChat,
                "private"   =>  MessageFilter.OnlyWhispers,
                "internal"  =>  MessageFilter.OnlyInternalCommands,
                _           =>  MessageFilter.AllText,
#pragma warning restore format // @formatter:on
            };
        }

        public override void GetText(string text)
        {
            text = GetVerbatim(text);
            string sender = "";
            string message = "";

            if (saveChat && IsChatMessage(text, ref message, ref sender))
            {
                Save("Chat " + sender + ": " + message);
            }
            else if (savePrivate && IsPrivateMessage(text, ref message, ref sender))
            {
                Save("Private " + sender + ": " + message);
            }
            else if (saveOther)
            {
                Save("Other: " + text);
            }
        }

        public override void OnInternalCommand(string commandName, string commandParams, string result)
        {
            if (saveInternal)
            {
                Save(string.Format("Internal {0}({1}): {2}", commandName, commandParams, result));
            }
        }

        private void Save(string tosave)
        {
            if (dateandtime)
                tosave = GetTimestamp() + ' ' + tosave;
            lock (logfileLock)
            {
                string? directory = Path.GetDirectoryName(logfile);
                if (!String.IsNullOrEmpty(directory) && !Directory.Exists(directory))
                    Directory.CreateDirectory(directory);
                FileStream stream = new(logfile, FileMode.OpenOrCreate);
                StreamWriter writer = new(stream);
                stream.Seek(0, SeekOrigin.End);
                writer.WriteLine(tosave);
                writer.Dispose();
                stream.Close();
            }
        }
    }
}