using System;
using System.Linq;
using LeafWeb.Core.DAL;
using LeafWeb.Core.Entities;
using LeafWeb.Core.Remote;
using NLog;

namespace LeafWeb.Web.Services
{
	public class PiscalQueueManager : IDisposable
	{
		private readonly DataService _dataService;
		private readonly PiscalService _piscalService;

		public PiscalQueueManager(DataService dataService, PiscalService piscalService)
		{
			_dataService = dataService;
			_piscalService = piscalService;
		}

		public PiscalQueueManager() : this(new DataService(), new PiscalService()) {}

		public void ProcessQueue()
		{
			var logger = LogManager.GetCurrentClassLogger();

			var runningLeafInputFiles = _dataService.GetLeafInputFiles(LeafInputStatusType.Running).ToList();
			foreach (var file in runningLeafInputFiles)
			{
				var status = _piscalService.GetLeafInputFileStatus(file);
				switch (status)
				{
					case PiscalStatus.Running:
						logger.Debug("LeafInputFile: {0}, {1}", file.Id, status);
						// continue running
						break;
					case PiscalStatus.Success:
						logger.Info("LeafInputFile: {0}, {1}", file.Id, status);
						// collect the leaf output
						var leafOutputFiles = _piscalService.RetrieveLeafOutputFile(file).ToList();
						foreach (var outputFile in leafOutputFiles)
						{
							_dataService.AddLeafOutputFile(outputFile);
						}
						logger.Info("LeafInputFile: {0}, output files: {1}", file.Id, string.Join(", ", leafOutputFiles.Select(o => o.Filename)));
						_dataService.SetLeafInputFileStatus(file, LeafInputStatusType.Complete);
						break;
					case PiscalStatus.Error:
						logger.Error("LeafInputFile: {0}", file.Id);
						_dataService.SetLeafInputFileStatus(file, LeafInputStatusType.Error);
						break;
				}
			}

			runningLeafInputFiles = _dataService.GetLeafInputFiles(LeafInputStatusType.Running).ToList();
			if (!runningLeafInputFiles.Any())
			{
				var queuedFile =
					_dataService
						.GetLeafInputFiles(LeafInputStatusType.Queued)
						.OrderBy(l => l.Id)
						.FirstOrDefault();

				if (queuedFile != null)
				{
					logger.Info("LeafInputFile: {0}, Start", queuedFile.Id);
					_piscalService.RunLeafInputFile(queuedFile);
					_dataService.SetLeafInputFileStatus(queuedFile, LeafInputStatusType.Running);
				}
			}
		}

		public void Dispose()
		{
			_dataService.Dispose();
		}
	}
}