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

extern alias HordeAgent;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Amazon.EC2.Model;
using Build.Bazel.Remote.Execution.V2;
using Google.LongRunning;
using HordeServer;
using HordeServer.Models;
using HordeServer.Services;
using HordeServer.Tasks.Impl;
using HordeServer.Utilities;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Console;
using Microsoft.VisualStudio.TestTools.UnitTesting;

using PoolId = HordeServer.Utilities.StringId<HordeServer.Models.IPool>;

namespace HordeServerTests.RemoteExec
{
	[TestClass]
	public class ActionTaskSourceTest : DatabaseIntegrationTest
	{
		private readonly TestSetup TestSetup;

		public ActionTaskSourceTest()
		{
			TestSetup = GetTestSetup().Result;
		}

		[TestMethod]
		public async Task BasicExecution()
		{
			ActionTaskSource TaskSource = CreateTaskSource();

			FakeAgent Agent = new FakeAgent();
			await TaskSource.SubscribeAsync(Agent);
			
			ExecuteRequest Req1 = new ExecuteRequest();
			Req1.SkipCacheLookup = true;
			Req1.ActionDigest = new Digest { Hash = "bogusTestingHash1", SizeBytes = 17 };
			
			ExecuteRequest Req2 = new ExecuteRequest();
			Req2.SkipCacheLookup = true;
			Req2.ActionDigest = new Digest { Hash = "bogusTestingHash2", SizeBytes = 17 };

			IActionExecuteOperation ExecuteOp1 = TaskSource.Execute(Req1);
			IActionExecuteOperation ExecuteOp2 = TaskSource.Execute(Req2);

			Task Pump1 = PumpExecuteOperation(TaskSource, ExecuteOp1, 10, Agent);
			Task Pump2 = PumpExecuteOperation(TaskSource, ExecuteOp2, 20, Agent);

			await Task.WhenAll(Pump1, Pump2);
		}
		
		[TestMethod]
		public async Task BasicExecutionWithPoolFilter()
		{
			RemoteExecInstanceSettings InstanceSettings = new RemoteExecInstanceSettings();
			InstanceSettings.PoolFilter = new List<string> {"pool1"};
			TestSetup.ServerSettingsMon.CurrentValue.RemoteExecSettings.Instances["foobar"] = InstanceSettings; 
			ActionTaskSource TaskSource = CreateTaskSource();

			FakeAgent Agent = new FakeAgent();
			Agent.ExplicitPools = new List<PoolId> {new PoolId("pool1")};
			await TaskSource.SubscribeAsync(Agent);
			
			ExecuteRequest Req1 = new ExecuteRequest();
			Req1.InstanceName = "foobar";
			Req1.SkipCacheLookup = true;
			Req1.ActionDigest = new Digest { Hash = "bogusTestingHash1", SizeBytes = 17 };

			IActionExecuteOperation ExecuteOp1 = TaskSource.Execute(Req1);

			await PumpExecuteOperation(TaskSource, ExecuteOp1, 10, Agent);
		}

		[TestMethod]
		public void CanBeScheduledOnAgent()
		{
			FakeAgent AgentWithNoPools = new FakeAgent();
			FakeAgent Agent = new FakeAgent();
			Agent.ExplicitPools = new List<StringId<IPool>> {new PoolId("pool1"), new PoolId("pool2")};

			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(Agent, new List<string> {"pool1"}));
			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(Agent, new List<string> {"pool2"}));
			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(Agent, new List<string> {"pool1", "pool2"}));
			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(Agent, new List<string> {"bogus", "pool2"}));
			Assert.IsFalse(ActionTaskSource.CanBeScheduledOnAgent(AgentWithNoPools, new List<string> {"bogus", "pool2"}));
			Assert.IsFalse(ActionTaskSource.CanBeScheduledOnAgent(Agent, new List<string> {"bogus", "foobar"}));
			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(Agent, new List<string>()));
			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(AgentWithNoPools, new List<string>()));
			
			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(Agent, null));
			Assert.IsTrue(ActionTaskSource.CanBeScheduledOnAgent(AgentWithNoPools, null));
		}
		
		private async Task<Operation> PumpExecuteOperation(ActionTaskSource TaskSource, IActionExecuteOperation ExecuteOp, int ExitCode, IAgent? AgentToReschedule)
		{
			Operation? LastOperation = null;
			await foreach (Operation Op in ExecuteOp.ReadStatusUpdatesAsync())
			{
				LastOperation = Op;
				Assert.IsTrue(Op.Metadata.TryUnpack(out ExecuteOperationMetadata Metadata));

				string Msg = $"id={Op.Name} digest={Metadata.ActionDigest.Hash} stage={Metadata.Stage}";

				if (Metadata.Stage == ExecutionStage.Types.Value.Executing)
				{
					ExecuteOp.TrySetResult(new ActionExecuteResult(new ActionResult {ExitCode = ExitCode}));
				}
				
				if (Op.Done)
				{
					Assert.IsTrue(Op.Response.TryUnpack(out ExecuteResponse Response));
					Assert.AreEqual(ExitCode, Response.Result.ExitCode);
					Msg += " result=" + Response;
				}
				
				Console.WriteLine(Msg);
			}

			if (AgentToReschedule != null)
			{
				// Schedule the agent again so the task source can execute actions on it
				await TaskSource.SubscribeAsync(AgentToReschedule);
			}

			return LastOperation!;
		}

		private ActionTaskSource CreateTaskSource()
		{
			ILogFileService LogFileService = (TestSetup.ServiceProvider.GetService(typeof(ILogFileService)) as ILogFileService)!;
			ILoggerFactory LoggerFactory = new LoggerFactory();
			ConsoleLoggerOptions LoggerOptions = new ConsoleLoggerOptions();
			TestOptionsMonitor<ConsoleLoggerOptions> LoggerOptionsMon = new TestOptionsMonitor<ConsoleLoggerOptions>(LoggerOptions);
			LoggerFactory.AddProvider(new ConsoleLoggerProvider(LoggerOptionsMon));
			ILogger<ActionTaskSource> Logger = LoggerFactory.CreateLogger<ActionTaskSource>();
			return new ActionTaskSource(null!, LogFileService, Logger, TestSetup.ServerSettingsMon);
		}
	}
}