using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading;
using JD.Core.ProjectManaging;
using JD.LogService;
using Packager.Tasks;
using TeaBox;
using Directory = System.IO.Directory;
using File = System.IO.File;
using LogCategory = JD.LogService.LogCategory;

namespace Packager
{
    /// <summary>
    ///     Message logging mechanism for the tool
    /// </summary>
    public class MessageLogger : ILogger
    {
        public delegate void MessageEvent(MessageLogger sender, string message);

        private readonly object _lock = new object();

        public string LogFilePath { get; }

        public string LoggedObjectName { get; }

        public MessageLogger(string loggedObjectName)
        {
            LoggedObjectName = loggedObjectName;

            var logFileDirectory = Path.Combine(DataPath.Value, "output", "temp", nameof(Packager));
            if (!Directory.Exists(logFileDirectory))
            {
                Directory.CreateDirectory(logFileDirectory);
            }

            Thread.Sleep(1); // avoid colliding file names
            var logFileName = $"{DateTime.Now.ToString("yyyyMMdd_HHmmss_fff", CultureInfo.InvariantCulture)}" +
                              $"_pid_{Process.GetCurrentProcess().Id}_{loggedObjectName}.txt";

            LogFilePath = Path.Combine(logFileDirectory, logFileName);
            LogInfo("Log file created.");
            
            // delete log files older than 48 hours
            var existingLogFiles = Directory.EnumerateFiles(logFileDirectory, "*.txt", SearchOption.TopDirectoryOnly);
            var logsToDelete = existingLogFiles.Select(f => new System.IO.FileInfo(f))
                                .Where(fi => fi.LastAccessTime < DateTime.Now.AddHours(-48));

            foreach (var logPath in logsToDelete.Select(f => f.FullName))
            {
                LogInfo($"Deleting old log file at \"{logPath}\"");
                File.Delete(logPath);
            }
        }

        public void Log(LogEvent @event)
        {
            switch (@event.Category)
            {
                case LogCategory.Message:
                    LogInfo(@event.Message);
                    break;

                case LogCategory.Error:
                    LogError(@event.Message);
                    break;

                case LogCategory.Warning:
                    LogWarning(@event.Message);
                    break;
                default:
                    var ex = new ArgumentOutOfRangeException(typeof(LogCategory).Name, @event.Category, "Value of log category was unhandled");
                    LogException(ex);
                    throw ex;
            }
        }

        public event MessageEvent OnInfoLogged;

        public event MessageEvent OnWarningLogged;

        public event MessageEvent OnErrorLogged;

        /// <summary>
        /// Makes the current MessageLogger able to catches log events from the given cookerWrapper.
        /// </summary>
        public void AttachCookerWrapper(cookerWrapper cookerWrapper)
        {
            cookerWrapper.onLogCook += OnCookerWrapperLog;
            cookerWrapper.onProgress += OnCookerWrapperProgress;
            cookerWrapper.onErrorCook += OnCookerWrapperCookingError;
            cookerWrapper.onLogError += OnCookerWrapperError;
            cookerWrapper.onLogFatal += OnCookerWrapperFatalError;
        }

        /// <summary>
        /// Stop catching log events from the given cookerWrapper.
        /// </summary>
        public void DetachCookerWrapper(cookerWrapper cookerWrapper)
        {
            cookerWrapper.onLogCook += OnCookerWrapperLog;
            cookerWrapper.onProgress += OnCookerWrapperProgress;
            cookerWrapper.onErrorCook += OnCookerWrapperCookingError;
            cookerWrapper.onLogError += OnCookerWrapperError;
            cookerWrapper.onLogFatal += OnCookerWrapperFatalError;
        }

        private void OnCookerWrapperFatalError(string progress)
        {
            this.LogError("Cooker wrapper encoutered a FATAL ERROR: " + progress);
        }

        private void OnCookerWrapperError(string progress)
        {
            this.LogError("Cooker wrapper encoutered an error: " + progress);
        }

        private void OnCookerWrapperCookingError(string text, bool errordescribed)
        {
            this.LogError("Cooker wrapper encoutered an error while cooking: " + text);
        }

        private void OnCookerWrapperProgress(float progress)
        {
            this.LogInfo(progress.ToString(CultureInfo.InvariantCulture));
        }

        private void OnCookerWrapperLog(string progress)
        {
            this.LogInfo(progress);
        }
        
        public void LogInfo(string message)
        {
            var text = $"\n{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff", CultureInfo.InvariantCulture)} INFO: {message}";
            Console.WriteLine(text);
            WriteToLogFile(text);

            OnInfoLogged?.Invoke(this, message);
        }

        public void LogWarning(string message)
        {
            var text = $"\n{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff", CultureInfo.InvariantCulture)} WARNING: {message}";
            Console.WriteLine(text);
            WriteToLogFile(text);

            OnWarningLogged?.Invoke(this, message);
        }

        public void LogError(string message)
        {
            var text = $"\n{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff", CultureInfo.InvariantCulture)} ERROR: {message}";
            Console.WriteLine(text);
            WriteToLogFile(text);

            OnErrorLogged?.Invoke(this, message);
        }
        
        public void LogException(Exception exception)
        {
            var text = $"\n{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff", CultureInfo.InvariantCulture)} EXCEPTION: {exception.Message}";
            text += "\n" + exception.StackTrace;

            Console.Error.WriteLine(text);
            WriteToLogFile(text);
        }
        
        public void LogTaskMessage(Task task, string message, LogCategory messageCategory)
        {
            switch (messageCategory)
            {
                case LogCategory.Message:
                    LogInfo($"[{task.InstanceName}] {message}");
                    break;

                case LogCategory.Error:
                    LogError($"[{task.InstanceName}] {message}");
                    break;

                case LogCategory.Warning:
                    LogWarning($"[{task.InstanceName}] {message}");
                    break;
                default:
                    var ex = new ArgumentOutOfRangeException(typeof(LogCategory).Name, messageCategory, "Value of log category was unhandled");
                    LogError(ex.Message);
                    throw ex;
            }
        }

        public void LogEndedTask(Task task)
        {
            var time = task.ElapsedTime;
            var timeString = (time.Minutes > 0 ? $"{time.Minutes} minute{(time.Minutes > 1 ? "s" : "")} " : "") +
                             $"{time.Seconds} second{(time.Seconds > 1 ? "s" : "")}";

            string endTaskMessage = $"[COMPLETED] (took {timeString})";
            LogTaskMessage(task, endTaskMessage, LogCategory.Message);
        }

        public void LogStartedTask(Task task)
        {
            var startTaskMessage = $"[STARTED]";
            LogTaskMessage(task, startTaskMessage, LogCategory.Message);
        }
        
        private void WriteToLogFile(string text)
        {
            lock (_lock)
            {
                File.AppendAllText(LogFilePath, text);
            }
        }
    }
}