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

using EpicGames.Core;
using EpicGames.ProjectStore;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;
using System.Xml;

namespace AutomationTool.Tasks
{

	/// <summary>
	/// Parameters for a task that exports an snapshot from ZenServer
	/// </summary>
	public class ZenImportOplogTaskParameters
	{
		/// <summary>
		/// The type of destination to import from to (cloud, file...)
		/// </summary>
		[TaskParameter]
		public string ImportType;

		/// <summary>
		/// comma separated full path to the oplog dir to import into the local zen server
		/// Files="Path1,Path2"
		/// </summary>
		[TaskParameter(Optional = true)]
		public string Files;

		/// <summary>
		/// The project from which to import for
		/// </summary>
		[TaskParameter(Optional = true)]
		public FileReference Project;

		/// <summary>
		/// The name of the newly created Zen Project we will be importing into
		/// </summary>
		[TaskParameter(Optional = true)]
		public string ProjectName;


		/// <summary>
		/// The target platform to import the snapshot for
		/// </summary>
		[TaskParameter(Optional = true)]
		public string Platform;

		/// <summary>
		/// Root dir for the UE project. Used to derive the Enging folder and the Project folder
		/// </summary>
		[TaskParameter(Optional = true)]
		public string RootDir;

		/// <summary>
		/// The name of the imported oplog
		/// </summary>
		[TaskParameter(Optional = true)]
		public string OplogName;

		/// <summary>
		/// The host URL for the zen server we are importing from
		/// </summary>
		[TaskParameter(Optional = true)]
		public string HostName = "localhost";

		/// <summary>
		/// The host port for the zen server we are importing from
		/// </summary>
		[TaskParameter(Optional = true)]
		public string HostPort = "8558";
		

		/// <summary>
		/// The cloud URL to import from
		/// </summary>
		[TaskParameter(Optional = true)]
		public string CloudURL;

		/// <summary>
		/// what namespace to use when importing from cloud
		/// </summary>
		[TaskParameter(Optional = true)]
		public string Namespace;

		/// <summary>
		/// what bucket to use when importing from cloud
		/// </summary>
		[TaskParameter(Optional = true)]
		public string Bucket;

		/// <summary>
		/// What key to use when importing from cloud
		/// </summary>
		[TaskParameter(Optional = true)]
		public string Key;
	}

	/// <summary>
	/// Imports an oplog from Zen to a specified destination.
	/// </summary>
	[TaskElement("ZenImportOplog", typeof(ZenImportOplogTaskParameters))]
	public class ZenImportOplogTask : BgTaskImpl
	{
		/// <summary>
		/// Parameters for the task
		/// </summary>
		ZenImportOplogTaskParameters Parameters;

		FileReference ProjectFile;

		/// <summary>
		/// Constructor.
		/// </summary>
		/// <param name="InParameters">Parameters for this task</param>
		public ZenImportOplogTask(ZenImportOplogTaskParameters InParameters)
		{
			Parameters = InParameters;
		}

		/// <summary>
		/// Execute the task.
		/// </summary>
		/// <param name="Job">Information about the current job</param>
		/// <param name="BuildProducts">Set of build products produced by this node.</param>
		/// <param name="TagNameToFileSet">Mapping from tag names to the set of files they include</param>
		public override Task ExecuteAsync(JobContext Job, HashSet<FileReference> BuildProducts, Dictionary<string, HashSet<FileReference>> TagNameToFileSet)
		{
			SnapshotStorageType ImportMethod = SnapshotStorageType.Invalid;
			if (!string.IsNullOrEmpty(Parameters.ImportType))
			{
				ImportMethod = (SnapshotStorageType)Enum.Parse(typeof(SnapshotStorageType), Parameters.ImportType);
			}

			ProjectFile = Parameters.Project;
			if (!FileReference.Exists(ProjectFile))
			{
				throw new AutomationException("Missing project file - {0}", ProjectFile.FullName);
			}

			ZenExportSnapshotTask.ZenLaunch(ProjectFile);

			// Get the Zen executable path
			FileReference ZenExe = ZenExportSnapshotTask.ZenExeFileReference();
			{
				if (String.IsNullOrEmpty(Parameters.RootDir))
				{
					throw new AutomationException("RootDir was not specified");
				}
				if (String.IsNullOrEmpty(Parameters.ProjectName))
				{
					throw new AutomationException("ProjectName was not specified");
				}
				
				// Create a new project to import everything into.
				string RootDir = Parameters.RootDir;
				string EngineDir = System.IO.Path.Combine(Parameters.RootDir, "Engine");
				string ProjectDir = System.IO.Path.Combine(Parameters.RootDir, ProjectFile.GetFileNameWithoutAnyExtensions());
				string HostURLArg = string.Format("--hosturl http://{0}:{1}", Parameters.HostName, Parameters.HostPort);
				StringBuilder OplogProjectCreateCommandline = new StringBuilder();
				OplogProjectCreateCommandline.AppendFormat("project-create -p {0} --rootdir {1} --enginedir {2} --projectdir {3} --projectfile {4} {5}",
					Parameters.ProjectName,
					RootDir,
					EngineDir,
					ProjectDir,
					ProjectFile.FullName,
					HostURLArg);

				Logger.LogInformation("Running '{Arg0} {Arg1}'", CommandUtils.MakePathSafeToUseWithCommandLine(ZenExe.FullName), OplogProjectCreateCommandline.ToString());
				CommandUtils.RunAndLog(CommandUtils.CmdEnv, ZenExe.FullName, OplogProjectCreateCommandline.ToString(), Options: CommandUtils.ERunOptions.Default);
			}

			switch (ImportMethod)
			{
				case SnapshotStorageType.File:
					ImportFromFile(ZenExe);
					break;
				case SnapshotStorageType.Cloud:
					ImportFromCloud(ZenExe);
					break;
				default:
					throw new AutomationException("Unknown/invalid/unimplemented import type - {0}", Parameters.ImportType);
			}

			WriteProjectStoreFile();
			return Task.CompletedTask;
		}

		private void ImportFromFile(FileReference ZenExe)
		{
			if (String.IsNullOrEmpty(Parameters.OplogName))
			{
				throw new AutomationException("OplogName was not specified");
			}

			foreach (string FileToImport in Parameters.Files.Split(','))
			{
				if (DirectoryReference.Exists(new DirectoryReference(FileToImport)))
				{
					StringBuilder OplogImportCommandline = new StringBuilder();
					OplogImportCommandline.AppendFormat("oplog-import --file {0} --oplog {1} -p {2}", FileToImport, Parameters.OplogName, Parameters.ProjectName);

					Logger.LogInformation("Running '{Arg0} {Arg1}'", CommandUtils.MakePathSafeToUseWithCommandLine(ZenExe.FullName), OplogImportCommandline.ToString());
					CommandUtils.RunAndLog(CommandUtils.CmdEnv, ZenExe.FullName, OplogImportCommandline.ToString(), Options: CommandUtils.ERunOptions.Default);
				}
			}
		}

		private void WriteProjectStoreFile()
		{
			DirectoryReference PlatformCookedDirectory = DirectoryReference.Combine(ProjectFile.Directory, "Saved", "Cooked", Parameters.Platform);
			if (!DirectoryReference.Exists(PlatformCookedDirectory))
			{
				DirectoryReference.CreateDirectory(PlatformCookedDirectory);
			}
			ProjectStoreData ProjectStore = new ProjectStoreData();
			ProjectStore.ZenServer = new ZenServerStoreData
			{
				ProjectId = Parameters.ProjectName,
				OplogId = Parameters.OplogName
			};

			JsonSerializerOptions SerializerOptions = new JsonSerializerOptions
			{
				AllowTrailingCommas = true,
				ReadCommentHandling = JsonCommentHandling.Skip,
				PropertyNameCaseInsensitive = true
			};
			SerializerOptions.Converters.Add(new JsonStringEnumConverter());

			FileReference ProjectStoreFile = FileReference.Combine(PlatformCookedDirectory, "ue.projectstore");
			File.WriteAllText(ProjectStoreFile.FullName, JsonSerializer.Serialize(ProjectStore, SerializerOptions), new UTF8Encoding(encoderShouldEmitUTF8Identifier: false));
		}

		private void ImportFromCloud(FileReference ZenExe)
		{
			if (string.IsNullOrEmpty(Parameters.CloudURL))
			{
				throw new AutomationException("Missing destination cloud host");
			}
			if (string.IsNullOrEmpty(Parameters.Namespace))
			{
				throw new AutomationException("Missing destination cloud namespace");
			}
			if (string.IsNullOrEmpty(Parameters.Key))
			{
				throw new AutomationException("Missing destination cloud storage key");
			}

			string BucketName = Parameters.Bucket;
			string ProjectNameAsBucketName = ProjectFile.GetFileNameWithoutAnyExtensions().ToLowerInvariant();
			if (string.IsNullOrEmpty(BucketName))
			{
				BucketName = ProjectNameAsBucketName;
			}

			string HostURLArg = string.Format("--hosturl http://{0}:{1}", Parameters.HostName, Parameters.HostPort);
			StringBuilder OplogImportCommandline = new StringBuilder();
			OplogImportCommandline.AppendFormat("oplog-import {0} --cloud {1} --namespace {2} --bucket {3}", HostURLArg, Parameters.CloudURL, Parameters.Namespace, BucketName);
			OplogImportCommandline.AppendFormat(" {0}", Parameters.Key);

			Logger.LogInformation("Running '{Arg0} {Arg1}'", CommandUtils.MakePathSafeToUseWithCommandLine(ZenExe.FullName), OplogImportCommandline.ToString());
			CommandUtils.RunAndLog(CommandUtils.CmdEnv, ZenExe.FullName, OplogImportCommandline.ToString(), Options: CommandUtils.ERunOptions.Default);
		}

		/// <summary>
		/// Output this task out to an XML writer.
		/// </summary>
		public override void Write(XmlWriter Writer)
		{
			Write(Writer, Parameters);
		}

		/// <summary>
		/// Find all the tags which are used as inputs to this task
		/// </summary>
		/// <returns>The tag names which are read by this task</returns>
		public override IEnumerable<string> FindConsumedTagNames()
		{
			yield break;
		}

		/// <summary>
		/// Find all the tags which are modified by this task
		/// </summary>
		/// <returns>The tag names which are modified by this task</returns>
		public override IEnumerable<string> FindProducedTagNames()
		{
			yield break;
		}
	}
}