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

using EpicGames.Perforce;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace P4VUtils.Commands
{
	[Command("robomergepreviewgraph", CommandCategory.Toolbox, 9)]
	class RobomergePreviewCommand : Command
	{
		public override string Description => "Shelves and Previews the pending changes to the Robomerge Graph.";

		public override CustomToolInfo CustomTool => new CustomToolInfo("Robomerge Preview Graph", "%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;
			}

			string? ClientName = Environment.GetEnvironmentVariable("P4CLIENT");
			using PerforceConnection Perforce = new PerforceConnection(null, null, ClientName, Logger);

			ClientRecord Client = await Perforce.GetClientAsync(ClientName, CancellationToken.None);
			if (Client.Stream == null)
			{
				Logger.LogError("Not being run from a stream client");
				return 1;
			}

			List<OpenedRecord> OpenedRecords = await Perforce.OpenedAsync(OpenedOptions.None, Change, null, null, -1, FileSpecList.Any, CancellationToken.None).ToListAsync();

			if (OpenedRecords.Any(x => x.ClientFile.EndsWith(".branchmap.json", StringComparison.OrdinalIgnoreCase)))
			{
				Logger.LogInformation("Shelving changelist {Change}", Change);
				await Perforce.ShelveAsync(Change, ShelveOptions.Overwrite, new[] { "//..." }, CancellationToken.None);

				List<DescribeRecord> Describe = await Perforce.DescribeAsync(DescribeOptions.Shelved, -1, new[] { Change }, CancellationToken.None);
				if (Describe[0].Files.Count == 0)
				{
					Logger.LogError("No files were shelved in {Change}", Change);
					return 1;
				}
			}
			else
			{
				DescribeRecord ChangeDesc = await Perforce.DescribeAsync(DescribeOptions.Shelved, -1, Change);

				if (!ChangeDesc.Files.Any(x => x.DepotFile.EndsWith(".branchmap.json", StringComparison.OrdinalIgnoreCase)))
				{
					Logger.LogError("No branchmapping.json files contained in changelist {Change}", Change);
					return 1;
				}
			}

			string Url = GetUrl(Change, ConfigValues);
			Logger.LogInformation("Opening {Url}", Url);

			ProcessUtils.OpenInNewProcess(Url);

			return 0;
		}

		static public string GetUrl(int Change, IReadOnlyDictionary<string, string> ConfigValues)
		{
			string? BaseUrl;
			if (!ConfigValues.TryGetValue("RobomergeURL", out BaseUrl))
			{
				BaseUrl = "https://configure-server-url-in-p4vutils.ini";
			}

			return $"{BaseUrl.TrimEnd('/')}/preview/{Change}";

		}
	}

	[Command("robomergetrackchange", CommandCategory.Toolbox, 11)]
	class RobomergeTrackChangeCommand : Command
	{
		public override string Description => "Opens the RoboMerge site to track where a submitted change has been merged to.";

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

		public override async Task<int> Execute(string[] Args, IReadOnlyDictionary<string, string> ConfigValues, ILogger Logger)
		{
			await Task.Yield();

			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;
			}

			string Url = GetUrl(Change, ConfigValues);
			Logger.LogInformation("Opening {Url}", Url);

			ProcessUtils.OpenInNewProcess(Url);

			return 0;
		}

		static public string GetUrl(int Change, IReadOnlyDictionary<string, string> ConfigValues)
		{
			string? BaseUrl;
			if (!ConfigValues.TryGetValue("RobomergeURL", out BaseUrl))
			{
				BaseUrl = "https://configure-server-url-in-p4vutils.ini";
			}

			return $"{BaseUrl.TrimEnd('/')}/trackchange/{Change}";

		}
	}
}