// Copyright Epic Games, Inc. All Rights Reserved.

using EpicGames.Core;
using EpicGames.Perforce;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace P4VUtils.Commands
{
	[Command("describe", CommandCategory.Root, 0)]
	class DescribeCommand : Command
	{
		public override string Description => "Prints out a description of the given changelist";

		public override CustomToolInfo CustomTool => new CustomToolInfo("Describe", "%c") { ShowConsole = true, RefreshUI = false};

		public override async Task<int> Execute(string[] Args, IReadOnlyDictionary<string, string> ConfigValues, ILogger Logger)
		{
			int Change;
			if (Args.Length < 2)
			{
				Logger.LogError("Missing changelist number");
				return 1;
			}
			else if (!int.TryParse(Args[1], out Change))
			{
				Logger.LogError("'{Argument}' is not a numbered changelist", Args[1]);
				return 1;
			}

			using PerforceConnection Perforce = new PerforceConnection(null, null, Logger);
			DescribeRecord DescribeRecord = await Perforce.DescribeAsync(Change, CancellationToken.None);

			foreach (string Line in DescribeRecord.Description.Split('\n'))
			{
				Console.WriteLine(Line);
			}

			return 0;
		}
	}

	[Command("describedirectory", CommandCategory.Toolbox, 8)]
	class DescribeDirectoryCommand : Command
	{
		public override string Description => "Prints out a description of last 30 days of CL's in the given directory to txt and csv";

		public override CustomToolInfo CustomTool => new CustomToolInfo("Describe Directory", "%D") { ShowConsole = true, RefreshUI = false };

		private int MaxDaysHistory = 30;
		private int MaxChangeListCount = 10000;

		public override async Task<int> Execute(string[] Args, IReadOnlyDictionary<string, string> ConfigValues, ILogger Logger)
		{
			if (Args.Length < 2)
			{
				Logger.LogError("Missing directory path(s)");
				return 1;
			}

			List<string> DescribePathsStrings = new List<string>();

			// %D is 'selected files or folders', ensure we only use folders
			for (int i = 1; i < Args.Length; i++)
			{
				Logger.LogInformation("params {Idx} - {Arg}", i, Args[i]);

				if (Args[i].EndsWith("...", StringComparison.Ordinal))
				{
					DescribePathsStrings.Add(Args[i]);
				}
				else
				{
					Logger.LogError("   ignoring individial selected file {File}", Args[i]);
				}
			}

			using PerforceConnection Perforce = new PerforceConnection(null, null, Logger);

			// grab a list of the changes with a large max count
			List<ChangesRecord> ChangeRecords = await Perforce.GetChangesAsync(ChangesOptions.LongOutput, MaxChangeListCount, ChangeStatus.Submitted, DescribePathsStrings, CancellationToken.None);

			if (ChangeRecords.Count == 0)
			{
				Logger.LogWarning("Could not find any p4 change record for {File}", DescribePathsStrings);
				return 1;
			}

			StringBuilder CSVFormat = new StringBuilder();
			StringBuilder PlainTextFormat = new StringBuilder();

			DateTime TimeNow = DateTime.Now;
			// iterate over the changes, filter to within the last x days
			foreach (ChangesRecord ChangeRecord in ChangeRecords)
			{
				TimeSpan Delta = TimeNow - ChangeRecord.Time;
				if (Delta.TotalDays < MaxDaysHistory)
				{
					// grab the description string - split it and remove lines that start with # or trim lines that have # within them.
					string[] Lines = ChangeRecord.Description.Split('\n');

					StringBuilder FilteredOutput = new StringBuilder();

					foreach(string line in Lines)
					{
						string[] subLines = line.Split('#');
						if (subLines.Length > 0)
						{
							FilteredOutput.Append(subLines[0]);
						}
					}

					// now remove all newlines for the plain text output, truncate to 100 chars for text size reasons
					string Single = FilteredOutput.ToString().
						Replace("\n", "", System.StringComparison.Ordinal).
						Replace("\r", "", System.StringComparison.Ordinal);
					string FinalSingleString;

					if (Single.Length > 100)
					{
						FinalSingleString = Single.Substring(0, 100);
						FinalSingleString += "(...)";
					}
					else
					{
						FinalSingleString = Single;
					}

					if(FinalSingleString.Length < 2)
					{
						FinalSingleString = Lines[0];
					}

					PlainTextFormat.AppendLine("{0} - {1} - {2} - {3}", ChangeRecord.Number, ChangeRecord.User, FinalSingleString, ChangeRecord.Time.ToString());

					string CSVString = FilteredOutput.ToString().Replace("\"", "\"\"",StringComparison.Ordinal);

					if (CSVString.Length < 2)
					{
						CSVString = Lines[0];
					}

					CSVFormat.AppendLine("{0},{1},\"{2}\",{3}", ChangeRecord.Number, ChangeRecord.User, CSVString, ChangeRecord.Time.ToString());
				}
			}

			string GuidString = Guid.NewGuid().ToString();
			string CsvPath = Path.Combine(Path.GetTempPath(), GuidString + ".csv");
			string PlainTextPath = Path.Combine(Path.GetTempPath(), GuidString + ".txt");

			using (StreamWriter Writer = new StreamWriter(PlainTextPath))
			{
				await Writer.WriteLineAsync(PlainTextFormat.ToString());
			}

			using (StreamWriter Writer = new StreamWriter(CsvPath))
			{
				await Writer.WriteLineAsync(CSVFormat.ToString());
			}

			ProcessUtils.OpenInNewProcess(PlainTextPath);

			Logger.LogInformation("Complete");
			Logger.LogInformation("PlainText: {PlainText}", PlainTextPath);
			Logger.LogInformation("CSV Form : {CsvPath}", CsvPath);

			return 0;
		}
	}
}