using Discord;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace RMSoftware.ModularBot
{
    public class ConsoleLogWriter
    {
        bool WriterBusy = false;

        

        Stack<LogMessage> log_stack = new Stack<LogMessage>();

        public async Task WriteEntry(LogMessage message)
        {
            string category = message.Source;
            string logText = message.Message;
            if (WriterBusy)//If busy, queue it up.
            {
                //check for item in queue.
                if (log_stack.Contains(message))
                {
                    //don't queue.
                    return;
                }
                else
                {
                    //re-queue.
                    log_stack.Push(message);
                }
                return;
            }
            else //Otherwise, process it.
            {
                WriterBusy = true;
                ConsoleColor BG = Console.BackgroundColor;
                ConsoleColor FG = Console.ForegroundColor;
                switch (message.Severity)
                {
                    case LogSeverity.Critical:
                        BG = ConsoleColor.DarkRed;
                        break;
                    case LogSeverity.Error:
                        BG = ConsoleColor.Red;
                        break;
                    case LogSeverity.Warning:
                        BG = ConsoleColor.Yellow; FG = ConsoleColor.Black;
                        break;
                    case LogSeverity.Info:
                        BG = ConsoleColor.DarkBlue;
                        break;
                    case LogSeverity.Verbose:
                        BG = ConsoleColor.Black;
                        break;
                    case LogSeverity.Debug:
                        BG = ConsoleColor.Black;
                        break;
                    default:
                        break;
                }
                
                Console.Write(DateTime.Now.ToString("HH:mm:ss").PadRight(9));
                ConsoleColor last = Console.BackgroundColor;
                ConsoleColor f_last = Console.ForegroundColor;
                Console.BackgroundColor = BG;
                Console.ForegroundColor = FG;
                if (message.Source.Length > 11)
                {

                    Console.Write(message.Source.Substring(0, 11));
                }
                else
                {

                    Console.Write(message.Source.PadRight(11));
                }
                Console.BackgroundColor = last;
                Console.ForegroundColor = f_last;
                Console.Write(" ");
                Console.WriteLine(message.Message);
                await Task.Delay(3);
                WriterBusy = false;//after the writer is finished writing this entry, it won't be busy.
            }
           
        }

        public void push(LogMessage logmessage)
        {
            log_stack.Push(logmessage);
        }

        public async Task ProcessStack()
        {
            while (true)
            {
                if(!Program.discon)
                {
                    SpinWait.SpinUntil(() => log_stack.Count > 0);
                }
                //once the log stack has shit inside, process it if writer isn't busy.
                if(WriterBusy)
                {
                    return;//Do not write an entry if the writer is busy.
                }
                await WriteEntry(log_stack.Pop());
            }
        }
    }
}