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

#include <zencore/compactbinarybuilder.h>
#include <zencore/compactbinaryvalidation.h>
#include <zencore/config.h>
#include <zencore/filesystem.h>
#include <zencore/fmtutils.h>
#include <zencore/iobuffer.h>
#include <zencore/logging.h>
#include <zencore/refcount.h>
#include <zencore/scopeguard.h>
#include <zencore/session.h>
#include <zencore/string.h>
#include <zencore/thread.h>
#include <zencore/timer.h>
#include <zencore/trace.h>
#include <zenhttp/httpserver.h>
#include <zenstore/basicfile.h>
#include <zenstore/cas.h>
#include <zenstore/cidstore.h>
#include <zenutil/zenserverprocess.h>

#if ZEN_PLATFORM_WINDOWS
#	include <zencore/windows.h>
#endif

#if ZEN_USE_MIMALLOC
ZEN_THIRD_PARTY_INCLUDES_START
#	include <mimalloc-new-delete.h>
#	include <mimalloc.h>
ZEN_THIRD_PARTY_INCLUDES_END
#endif

ZEN_THIRD_PARTY_INCLUDES_START
#include <fmt/format.h>
#include <asio.hpp>
#include <lua.hpp>
ZEN_THIRD_PARTY_INCLUDES_END

#include <exception>
#include <list>
#include <optional>
#include <regex>
#include <set>
#include <unordered_map>

//////////////////////////////////////////////////////////////////////////
// We don't have any doctest code in this file but this is needed to bring
// in some shared code into the executable

#if ZEN_WITH_TESTS
#	define DOCTEST_CONFIG_IMPLEMENT
#	include <zencore/testing.h>
#	undef DOCTEST_CONFIG_IMPLEMENT
#endif

//////////////////////////////////////////////////////////////////////////

#include "casstore.h"
#include "config.h"
#include "diag/logging.h"

#if ZEN_PLATFORM_WINDOWS
#	include "windows/service.h"
#endif

//////////////////////////////////////////////////////////////////////////
// Sentry
//

#define USE_SENTRY 1

#if USE_SENTRY
#	define SENTRY_BUILD_STATIC 1
ZEN_THIRD_PARTY_INCLUDES_START
#	include <sentry.h>
ZEN_THIRD_PARTY_INCLUDES_END

// Sentry currently does not automatically add all required Windows
// libraries to the linker when consumed via vcpkg

#	if ZEN_PLATFORM_WINDOWS
#		pragma comment(lib, "sentry.lib")
#		pragma comment(lib, "dbghelp.lib")
#		pragma comment(lib, "winhttp.lib")
#		pragma comment(lib, "version.lib")
#	endif
#endif

//////////////////////////////////////////////////////////////////////////
// Services
//

#include "admin/admin.h"
#include "cache/structuredcache.h"
#include "cache/structuredcachestore.h"
#include "compute/apply.h"
#include "diag/diagsvcs.h"
#include "experimental/frontend.h"
#include "experimental/usnjournal.h"
#include "monitoring/httpstats.h"
#include "monitoring/httpstatus.h"
#include "projectstore.h"
#include "testing/httptest.h"
#include "testing/launch.h"
#include "upstream/jupiter.h"
#include "upstream/upstreamcache.h"
#include "upstream/zen.h"
#include "zenstore/gc.h"
#include "zenstore/scrub.h"

#define ZEN_APP_NAME "Zen store"

namespace zen {

using namespace std::literals;

namespace utils {
	asio::error_code ResolveHostname(asio::io_context&		   Ctx,
									 std::string_view		   Host,
									 std::string_view		   DefaultPort,
									 std::vector<std::string>& OutEndpoints)
	{
		std::string_view Port = DefaultPort;

		if (const size_t Idx = Host.find(":"); Idx != std::string_view::npos)
		{
			Port = Host.substr(Idx + 1);
			Host = Host.substr(0, Idx);
		}

		asio::ip::tcp::resolver Resolver(Ctx);

		asio::error_code					  ErrorCode;
		asio::ip::tcp::resolver::results_type Endpoints = Resolver.resolve(Host, Port, ErrorCode);

		if (!ErrorCode)
		{
			for (const asio::ip::tcp::endpoint Ep : Endpoints)
			{
				OutEndpoints.push_back(fmt::format("http://{}:{}", Ep.address().to_string(), Ep.port()));
			}
		}

		return ErrorCode;
	}
}  // namespace utils

class ZenServer : public IHttpStatusProvider
{
public:
	void Initialize(const ZenServerOptions& ServerOptions, ZenServerState::ZenServerEntry* ServerEntry)
	{
		m_ServerEntry			 = ServerEntry;
		m_DebugOptionForcedCrash = ServerOptions.ShouldCrash;
		const int ParentPid		 = ServerOptions.OwnerPid;

		if (ParentPid)
		{
			zen::ProcessHandle OwnerProcess;
			OwnerProcess.Initialize(ParentPid);

			if (!OwnerProcess.IsValid())
			{
				ZEN_WARN("Unable to initialize process handle for specified parent pid #{}", ParentPid);

				// If the pid is not reachable should we just shut down immediately? the intended owner process
				// could have been killed or somehow crashed already
			}
			else
			{
				ZEN_INFO("Using parent pid #{} to control process lifetime", ParentPid);
			}

			m_ProcessMonitor.AddPid(ParentPid);
		}

		// Initialize/check mutex based on base port

		std::string MutexName = fmt::format("zen_{}", ServerOptions.BasePort);

		if (zen::NamedMutex::Exists(MutexName) || ((m_ServerMutex.Create(MutexName) == false)))
		{
			throw std::runtime_error(fmt::format("Failed to create mutex '{}' - is another instance already running?", MutexName).c_str());
		}

		InitializeState(ServerOptions);

		m_HealthService.SetHealthInfo({.DataRoot		= m_DataRoot,
									   .AbsLogPath		= ServerOptions.AbsLogFile,
									   .HttpServerClass = std::string(ServerOptions.HttpServerClass),
									   .BuildVersion	= std::string(ZEN_CFG_VERSION_BUILD_STRING_FULL)});

		// Ok so now we're configured, let's kick things off

		m_Http = zen::CreateHttpServer(ServerOptions.HttpServerClass);
		m_Http->Initialize(ServerOptions.BasePort);
		m_Http->RegisterService(m_HealthService);
		m_Http->RegisterService(m_StatsService);
		m_Http->RegisterService(m_StatusService);
		m_StatusService.RegisterHandler("status", *this);

		// Initialize storage and services

		ZEN_INFO("initializing storage");

		zen::CasStoreConfiguration Config;
		Config.RootDirectory = m_DataRoot / "cas";

		m_CasStore->Initialize(Config);

		m_CidStore = std::make_unique<zen::CidStore>(*m_CasStore, m_DataRoot / "cid");
		m_CasGc.SetCidStore(m_CidStore.get());

		ZEN_INFO("instantiating project service");

		m_ProjectStore = new zen::ProjectStore(*m_CidStore, m_DataRoot / "projects", m_CasGc);
		m_HttpProjectService.reset(new zen::HttpProjectService{*m_CidStore, m_ProjectStore});

#if ZEN_USE_NAMED_PIPES
		m_LocalProjectService = zen::LocalProjectService::New(*m_CasStore, m_ProjectStore);
#endif

#if ZEN_USE_EXEC
		std::filesystem::path SandboxDir = m_DataRoot / "exec" / "sandbox";
		zen::CreateDirectories(SandboxDir);
		m_HttpLaunchService = std::make_unique<zen::HttpLaunchService>(*m_CasStore, SandboxDir);
#endif

#if ZEN_WITH_COMPUTE_SERVICES
		ZEN_INFO("instantiating compute services");

		std::filesystem::path SandboxDir = m_DataRoot / "exec" / "sandbox";
		zen::CreateDirectories(SandboxDir);
		m_HttpLaunchService = std::make_unique<zen::HttpLaunchService>(*m_CasStore, SandboxDir);

		std::filesystem::path ApplySandboxDir = m_DataRoot / "exec" / "apply";
		zen::CreateDirectories(ApplySandboxDir);
		m_HttpFunctionService = std::make_unique<zen::HttpFunctionService>(*m_CasStore, *m_CidStore, ApplySandboxDir);
#endif	// ZEN_WITH_COMPUTE_SERVICES

		if (ServerOptions.StructuredCacheEnabled)
		{
			InitializeStructuredCache(ServerOptions);
		}
		else
		{
			ZEN_INFO("NOT instantiating structured cache service");
		}

#if ZEN_ENABLE_MESH
		if (ServerOptions.MeshEnabled)
		{
			StartMesh(BasePort);
		}
		else
		{
			ZEN_INFO("NOT starting mesh");
		}
#endif

		m_Http->RegisterService(m_TestService);	 // NOTE: this is intentionally not limited to test mode as it's useful for diagnostics
		m_Http->RegisterService(m_TestingService);
		m_Http->RegisterService(m_AdminService);

		if (m_HttpProjectService)
		{
			m_Http->RegisterService(*m_HttpProjectService);
		}

		m_Http->RegisterService(m_CasService);

		if (m_StructuredCacheService)
		{
			m_Http->RegisterService(*m_StructuredCacheService);
		}

#if ZEN_WITH_COMPUTE_SERVICES
		if (m_HttpLaunchService)
		{
			m_Http->RegisterService(*m_HttpLaunchService);
		}

		if (m_HttpFunctionService)
		{
			m_Http->RegisterService(*m_HttpFunctionService);
		}
#endif	// ZEN_WITH_COMPUTE_SERVICES

		m_FrontendService = std::make_unique<HttpFrontendService>(m_ContentRoot);

		if (m_FrontendService)
		{
			m_Http->RegisterService(*m_FrontendService);
		}

		ZEN_INFO("initializing GC, enabled '{}', interval {}s", ServerOptions.GcConfig.Enabled, ServerOptions.GcConfig.IntervalSeconds);
		zen::GcSchedulerConfig GcConfig{
			.RootDirectory		 = m_DataRoot / "gc",
			.Interval			 = std::chrono::seconds(ServerOptions.GcConfig.IntervalSeconds),
			.MaxCacheDuration	 = std::chrono::seconds(ServerOptions.GcConfig.Cache.MaxDurationSeconds),
			.CollectSmallObjects = ServerOptions.GcConfig.CollectSmallObjects,
			.Enabled			 = ServerOptions.GcConfig.Enabled,
		};
		m_GcScheduler.Initialize(GcConfig);
	}

	void InitializeState(const ZenServerOptions& ServerOptions);
	void InitializeStructuredCache(const ZenServerOptions& ServerOptions);

#if ZEN_ENABLE_MESH
	void StartMesh(int BasePort)
	{
		ZEN_INFO("initializing mesh discovery");
		m_ZenMesh.Start(uint16_t(BasePort));
	}
#endif

	void Run()
	{
		// This is disabled for now, awaiting better scheduling
		//
		// Scrub();

		if (m_ProcessMonitor.IsActive())
		{
			EnqueueTimer();
		}

		if (!m_TestMode)
		{
			ZEN_INFO("__________                _________ __                        ");
			ZEN_INFO("\\____    /____   ____    /   _____//  |_  ___________   ____  ");
			ZEN_INFO("  /     // __ \\ /    \\   \\_____  \\\\   __\\/  _ \\_  __ \\_/ __ \\ ");
			ZEN_INFO(" /     /\\  ___/|   |  \\  /        \\|  | (  <_> )  | \\/\\  ___/ ");
			ZEN_INFO("/_______ \\___  >___|  / /_______  /|__|  \\____/|__|    \\___  >");
			ZEN_INFO("        \\/   \\/     \\/          \\/                         \\/ ");
		}

		ZEN_INFO(ZEN_APP_NAME " now running (pid: {})", zen::GetCurrentProcessId());

#if USE_SENTRY
		sentry_clear_modulecache();
#endif

		if (m_DebugOptionForcedCrash)
		{
			ZEN_DEBUG_BREAK();
		}

		const bool IsInteractiveMode = zen::IsInteractiveSession() && !m_TestMode;

		SetNewState(kRunning);

		OnReady();

		m_Http->Run(IsInteractiveMode);

		SetNewState(kShuttingDown);

		ZEN_INFO(ZEN_APP_NAME " exiting");

		m_IoContext.stop();

		Flush();
	}

	void RequestExit(int ExitCode)
	{
		RequestApplicationExit(ExitCode);
		m_Http->RequestExit();
	}

	void Cleanup() { ZEN_INFO(ZEN_APP_NAME " cleaning up"); }

	void SetDedicatedMode(bool State) { m_IsDedicatedMode = State; }
	void SetTestMode(bool State) { m_TestMode = State; }
	void SetDataRoot(std::filesystem::path Root) { m_DataRoot = Root; }
	void SetContentRoot(std::filesystem::path Root) { m_ContentRoot = Root; }

	std::function<void()> m_IsReadyFunc;
	void				  SetIsReadyFunc(std::function<void()>&& IsReadyFunc) { m_IsReadyFunc = std::move(IsReadyFunc); }
	void				  OnReady();

	void EnsureIoRunner()
	{
		if (!m_IoRunner.joinable())
		{
			m_IoRunner = std::move(std::jthread{[this] { m_IoContext.run(); }});
		}
	}

	void EnqueueTimer()
	{
		m_PidCheckTimer.expires_after(std::chrono::seconds(1));
		m_PidCheckTimer.async_wait([this](const asio::error_code&) { CheckOwnerPid(); });

		EnsureIoRunner();
	}

	void CheckOwnerPid()
	{
		// Pick up any new "owner" processes

		std::set<uint32_t> AddedPids;

		for (auto& PidEntry : m_ServerEntry->SponsorPids)
		{
			if (uint32_t ThisPid = PidEntry.load(std::memory_order_relaxed))
			{
				if (PidEntry.compare_exchange_strong(ThisPid, 0))
				{
					if (AddedPids.insert(ThisPid).second)
					{
						m_ProcessMonitor.AddPid(ThisPid);

						ZEN_INFO("added process with pid #{} as a sponsor process", ThisPid);
					}
				}
			}
		}

		if (m_ProcessMonitor.IsRunning())
		{
			EnqueueTimer();
		}
		else
		{
			ZEN_INFO(ZEN_APP_NAME " exiting since sponsor processes are all gone");

			RequestExit(0);
		}
	}

	void Scrub()
	{
		Stopwatch Timer;
		ZEN_INFO("Storage validation STARTING");

		ScrubContext Ctx;
		m_CasStore->Scrub(Ctx);
		m_CidStore->Scrub(Ctx);
		m_ProjectStore->Scrub(Ctx);
		m_StructuredCacheService->Scrub(Ctx);

		const uint64_t ElapsedTimeMs = Timer.GetElapsedTimeMs();

		ZEN_INFO("Storage validation DONE in {}, ({} in {} chunks - {})",
				 NiceTimeSpanMs(ElapsedTimeMs),
				 NiceBytes(Ctx.ScrubbedBytes()),
				 Ctx.ScrubbedChunks(),
				 NiceByteRate(Ctx.ScrubbedBytes(), ElapsedTimeMs));
	}

	void Flush()
	{
		if (m_CasStore)
			m_CasStore->Flush();

		if (m_CidStore)
			m_CidStore->Flush();

		if (m_StructuredCacheService)
			m_StructuredCacheService->Flush();

		if (m_ProjectStore)
			m_ProjectStore->Flush();
	}

	virtual void HandleStatusRequest(HttpServerRequest& Request) override
	{
		CbObjectWriter Cbo;
		Cbo << "ok" << true;
		Cbo << "state" << ToString(m_CurrentState);
		Request.WriteResponse(HttpResponseCode::OK, Cbo.Save());
	}

private:
	ZenServerState::ZenServerEntry* m_ServerEntry	  = nullptr;
	bool							m_IsDedicatedMode = false;
	bool							m_TestMode		  = false;
	CbObject						m_RootManifest;
	std::filesystem::path			m_DataRoot;
	std::filesystem::path			m_ContentRoot;
	std::jthread					m_IoRunner;
	asio::io_context				m_IoContext;
	asio::steady_timer				m_PidCheckTimer{m_IoContext};
	zen::ProcessMonitor				m_ProcessMonitor;
	zen::NamedMutex					m_ServerMutex;

	enum ServerState
	{
		kInitializing,
		kRunning,
		kShuttingDown
	} m_CurrentState = kInitializing;

	inline void SetNewState(ServerState NewState) { m_CurrentState = NewState; }

	std::string_view ToString(ServerState Value)
	{
		switch (Value)
		{
			case kInitializing:
				return "initializing"sv;
			case kRunning:
				return "running"sv;
			case kShuttingDown:
				return "shutdown"sv;
			default:
				return "unknown"sv;
		}
	}

	zen::Ref<zen::HttpServer>						 m_Http;
	zen::HttpStatusService							 m_StatusService;
	zen::HttpStatsService							 m_StatsService;
	zen::CasGc										 m_CasGc;
	zen::GcScheduler								 m_GcScheduler{m_CasGc};
	std::unique_ptr<zen::CasStore>					 m_CasStore{zen::CreateCasStore(m_CasGc)};
	std::unique_ptr<zen::CidStore>					 m_CidStore;
	std::unique_ptr<zen::ZenCacheStore>				 m_CacheStore;
	zen::CasScrubber								 m_Scrubber{*m_CasStore};
	zen::HttpTestService							 m_TestService;
	zen::HttpTestingService							 m_TestingService;
	zen::HttpCasService								 m_CasService{*m_CasStore};
	zen::RefPtr<zen::ProjectStore>					 m_ProjectStore;
	zen::Ref<zen::LocalProjectService>				 m_LocalProjectService;
	std::unique_ptr<zen::HttpProjectService>		 m_HttpProjectService;
	std::unique_ptr<zen::HttpStructuredCacheService> m_StructuredCacheService;
	zen::HttpAdminService							 m_AdminService{m_GcScheduler};
	zen::HttpHealthService							 m_HealthService;
	zen::Mesh										 m_ZenMesh{m_IoContext};
#if ZEN_WITH_COMPUTE_SERVICES
	std::unique_ptr<zen::HttpLaunchService>	  m_HttpLaunchService;
	std::unique_ptr<zen::HttpFunctionService> m_HttpFunctionService;
#endif
	std::unique_ptr<zen::HttpFrontendService> m_FrontendService;

#if ZEN_USE_EXEC
	std::unique_ptr<zen::HttpLaunchService> m_HttpLaunchService;
#endif

#if ZEN_USE_NAMED_PIPES
	zen::Ref<zen::LocalProjectService> m_LocalProjectService;
#endif

	bool m_DebugOptionForcedCrash = false;
};

void
ZenServer::OnReady()
{
	m_ServerEntry->SignalReady();

	if (m_IsReadyFunc)
	{
		m_IsReadyFunc();
	}
}

void
ZenServer::InitializeState(const ZenServerOptions& ServerOptions)
{
	// Check root manifest to deal with schema versioning

	bool		WipeState  = false;
	std::string WipeReason = "Unspecified";

	bool				  UpdateManifest = false;
	std::filesystem::path ManifestPath	 = m_DataRoot / "root_manifest";
	FileContents		  ManifestData	 = zen::ReadFile(ManifestPath);

	if (ManifestData.ErrorCode)
	{
		if (ServerOptions.IsFirstRun)
		{
			ZEN_INFO("Initializing state at '{}'", m_DataRoot);

			UpdateManifest = true;
		}
		else
		{
			WipeState  = true;
			WipeReason = fmt::format("No manifest present at '{}'", ManifestPath);
		}
	}
	else
	{
		IoBuffer Manifest = ManifestData.Flatten();

		if (CbValidateError ValidationResult = ValidateCompactBinary(Manifest, CbValidateMode::All);
			ValidationResult != CbValidateError::None)
		{
			ZEN_ERROR("Manifest validation failed: {}, state will be wiped", ValidationResult);

			WipeState  = true;
			WipeReason = fmt::format("Validation of manifest at '{}' failed: {}", ManifestPath, ValidationResult);
		}
		else
		{
			m_RootManifest = LoadCompactBinaryObject(Manifest);

			const int32_t ManifestVersion = m_RootManifest["schema_version"].AsInt32(0);

			if (ManifestVersion != ZEN_CFG_SCHEMA_VERSION)
			{
				WipeState  = true;
				WipeReason = fmt::format("Manifest schema version: {}, differs from required: {}", ManifestVersion, ZEN_CFG_SCHEMA_VERSION);
			}
		}
	}

	// Release any open handles so we can overwrite the manifest
	ManifestData = {};

	// Handle any state wipe

	if (WipeState)
	{
		ZEN_WARN("Wiping state at '{}' - reason: '{}'", m_DataRoot, WipeReason);

		std::error_code Ec;
		for (const std::filesystem::directory_entry& DirEntry : std::filesystem::directory_iterator{m_DataRoot, Ec})
		{
			if (DirEntry.is_directory() && (DirEntry.path().filename() != "logs"))
			{
				ZEN_INFO("Deleting '{}'", DirEntry.path());

				std::filesystem::remove_all(DirEntry.path(), Ec);

				if (Ec)
				{
					ZEN_WARN("Delete of '{}' returned error: '{}'", DirEntry.path(), Ec.message());
				}
			}
		}

		ZEN_INFO("Wiped all directories in data root");

		UpdateManifest = true;
	}

	if (UpdateManifest)
	{
		// Write new manifest

		const DateTime Now = DateTime::Now();

		CbObjectWriter Cbo;
		Cbo << "schema_version" << ZEN_CFG_SCHEMA_VERSION << "created" << Now << "updated" << Now << "state_id" << Oid::NewOid();

		m_RootManifest = Cbo.Save();

		WriteFile(ManifestPath, m_RootManifest.GetBuffer().AsIoBuffer());
	}
}

void
ZenServer::InitializeStructuredCache(const ZenServerOptions& ServerOptions)
{
	using namespace std::literals;
	auto ValueOrDefault = [](std::string_view Value, std::string_view Default) { return Value.empty() ? Default : Value; };

	ZEN_INFO("instantiating structured cache service");
	m_CacheStore = std::make_unique<ZenCacheStore>(m_CasGc, m_DataRoot / "cache");

	std::unique_ptr<zen::UpstreamCache> UpstreamCache;
	if (ServerOptions.UpstreamCacheConfig.CachePolicy != UpstreamCachePolicy::Disabled)
	{
		const ZenUpstreamCacheConfig& UpstreamConfig = ServerOptions.UpstreamCacheConfig;

		zen::UpstreamCacheOptions UpstreamOptions;
		UpstreamOptions.ReadUpstream  = (uint8_t(ServerOptions.UpstreamCacheConfig.CachePolicy) & uint8_t(UpstreamCachePolicy::Read)) != 0;
		UpstreamOptions.WriteUpstream = (uint8_t(ServerOptions.UpstreamCacheConfig.CachePolicy) & uint8_t(UpstreamCachePolicy::Write)) != 0;

		if (UpstreamConfig.UpstreamThreadCount < 32)
		{
			UpstreamOptions.ThreadCount = static_cast<uint32_t>(UpstreamConfig.UpstreamThreadCount);
		}

		UpstreamOptions.StatsEnabled = UpstreamConfig.StatsEnabled;

		UpstreamCache = zen::MakeUpstreamCache(UpstreamOptions, *m_CacheStore, *m_CidStore);

		// Zen upstream
		{
			std::vector<std::string> ZenUrls = UpstreamConfig.ZenConfig.Urls;
			if (!UpstreamConfig.ZenConfig.Dns.empty())
			{
				for (const std::string& Dns : UpstreamConfig.ZenConfig.Dns)
				{
					if (!Dns.empty())
					{
						const asio::error_code Err = zen::utils::ResolveHostname(m_IoContext, Dns, "1337"sv, ZenUrls);
						if (Err)
						{
							ZEN_ERROR("resolve '{}' FAILED, reason '{}'", Err.message());
						}
					}
				}
			}

			std::erase_if(ZenUrls, [](const auto& Url) { return Url.empty(); });

			if (!ZenUrls.empty())
			{
				std::unique_ptr<zen::UpstreamEndpoint> ZenEndpoint =
					zen::MakeZenUpstreamEndpoint({.Urls			  = ZenUrls,
												  .ConnectTimeout = std::chrono::milliseconds(UpstreamConfig.ConnectTimeoutMilliseconds),
												  .Timeout		  = std::chrono::milliseconds(UpstreamConfig.TimeoutMilliseconds)});
				UpstreamCache->RegisterEndpoint(std::move(ZenEndpoint));
			}
		}

		// Jupiter upstream
		{
			zen::CloudCacheClientOptions Options;
			if (UpstreamConfig.JupiterConfig.UseProductionSettings)
			{
				Options =
					zen::CloudCacheClientOptions{.ServiceUrl		 = "https://jupiter.devtools.epicgames.com"sv,
												 .DdcNamespace		 = "ue.ddc"sv,
												 .BlobStoreNamespace = "ue.ddc"sv,
												 .OAuthProvider		 = "https://epicgames.okta.com/oauth2/auso645ojjWVdRI3d0x7/v1/token"sv,
												 .OAuthClientId		 = "0oao91lrhqPiAlaGD0x7"sv,
												 .OAuthSecret		 = "-GBWjjenhCgOwhxL5yBKNJECVIoDPH0MK4RDuN7d"sv,
												 .ConnectTimeout	 = std::chrono::milliseconds(UpstreamConfig.ConnectTimeoutMilliseconds),
												 .Timeout			 = std::chrono::milliseconds(UpstreamConfig.TimeoutMilliseconds),
												 .UseLegacyDdc		 = false};
			}
			else if (UpstreamConfig.JupiterConfig.UseDevelopmentSettings)
			{
				Options =
					zen::CloudCacheClientOptions{.ServiceUrl		 = "https://jupiter.devtools-dev.epicgames.com"sv,
												 .DdcNamespace		 = "ue4.ddc"sv,
												 .BlobStoreNamespace = "test.ddc"sv,
												 .OAuthProvider		 = "https://epicgames.okta.com/oauth2/auso645ojjWVdRI3d0x7/v1/token"sv,
												 .OAuthClientId		 = "0oao91lrhqPiAlaGD0x7"sv,
												 .OAuthSecret		 = "-GBWjjenhCgOwhxL5yBKNJECVIoDPH0MK4RDuN7d"sv,
												 .ConnectTimeout	 = std::chrono::milliseconds(UpstreamConfig.ConnectTimeoutMilliseconds),
												 .Timeout			 = std::chrono::milliseconds(UpstreamConfig.TimeoutMilliseconds),
												 .UseLegacyDdc		 = false};
			}

			Options.ServiceUrl		   = ValueOrDefault(UpstreamConfig.JupiterConfig.Url, Options.ServiceUrl);
			Options.DdcNamespace	   = ValueOrDefault(UpstreamConfig.JupiterConfig.DdcNamespace, Options.DdcNamespace);
			Options.BlobStoreNamespace = ValueOrDefault(UpstreamConfig.JupiterConfig.Namespace, Options.BlobStoreNamespace);
			Options.OAuthProvider	   = ValueOrDefault(UpstreamConfig.JupiterConfig.OAuthProvider, Options.OAuthProvider);
			Options.OAuthClientId	   = ValueOrDefault(UpstreamConfig.JupiterConfig.OAuthClientId, Options.OAuthClientId);
			Options.OAuthSecret		   = ValueOrDefault(UpstreamConfig.JupiterConfig.OAuthClientSecret, Options.OAuthSecret);
			Options.UseLegacyDdc |= UpstreamConfig.JupiterConfig.UseLegacyDdc;

			if (!Options.ServiceUrl.empty())
			{
				std::unique_ptr<zen::UpstreamEndpoint> JupiterEndpoint = zen::MakeJupiterUpstreamEndpoint(Options);
				UpstreamCache->RegisterEndpoint(std::move(JupiterEndpoint));
			}
		}

		if (UpstreamCache->Initialize())
		{
			ZEN_INFO("upstream cache active ({})",
					 UpstreamOptions.ReadUpstream && UpstreamOptions.WriteUpstream ? "READ|WRITE"
					 : UpstreamOptions.ReadUpstream								   ? "READONLY"
					 : UpstreamOptions.WriteUpstream							   ? "WRITEONLY"
																				   : "DISABLED");
		}
		else
		{
			UpstreamCache.reset();
			ZEN_INFO("NOT using upstream cache");
		}
	}

	m_StructuredCacheService.reset(
		new zen::HttpStructuredCacheService(*m_CacheStore, *m_CidStore, m_StatsService, m_StatusService, std::move(UpstreamCache)));
}

////////////////////////////////////////////////////////////////////////////////

class ZenEntryPoint
{
public:
	ZenEntryPoint(ZenServerOptions& ServerOptions);
	ZenEntryPoint(const ZenEntryPoint&) = delete;
	ZenEntryPoint& operator=(const ZenEntryPoint&) = delete;
	int			   Run();

private:
	ZenServerOptions& m_ServerOptions;
	zen::LockFile	  m_LockFile;
};

ZenEntryPoint::ZenEntryPoint(ZenServerOptions& ServerOptions) : m_ServerOptions(ServerOptions)
{
}

int
ZenEntryPoint::Run()
{
#if USE_SENTRY
	// Initialize sentry.io client

	sentry_options_t* SentryOptions = sentry_options_new();
	sentry_options_set_dsn(SentryOptions, "https://8ba3441bebc941c1ae24b8cd2fd25d55@o10593.ingest.sentry.io/5919284");
	sentry_options_set_database_path(SentryOptions, PathToUtf8(m_ServerOptions.DataDir / ".sentry-native").c_str());
	sentry_init(SentryOptions);

	auto _ = zen::MakeGuard([] { sentry_close(); });
#endif

	auto& ServerOptions = m_ServerOptions;

	try
	{
		// Mutual exclusion and synchronization

		std::error_code Ec;

		std::filesystem::path LockFilePath = ServerOptions.DataDir / ".lock";

		bool IsReady = false;

		auto MakeLockData = [&] {
			CbObjectWriter Cbo;
			Cbo << "pid" << zen::GetCurrentProcessId() << "data" << PathToUtf8(ServerOptions.DataDir) << "port" << ServerOptions.BasePort
				<< "session_id" << GetSessionId() << "ready" << IsReady;
			return Cbo.Save();
		};

		m_LockFile.Create(LockFilePath, MakeLockData(), Ec);

		if (Ec)
		{
			ConsoleLog().error("ERROR: Unable to grab lock at '{}' (error: '{}')", LockFilePath, Ec.message());

			std::exit(99);
		}

		InitializeLogging(ServerOptions);

		ZEN_INFO(ZEN_APP_NAME " - starting on port {}, version '{}'", ServerOptions.BasePort, ZEN_CFG_VERSION_BUILD_STRING_FULL);

		ZenServerState ServerState;
		ServerState.Initialize();
		ServerState.Sweep();

		ZenServerState::ZenServerEntry* Entry = ServerState.Lookup(ServerOptions.BasePort);

		if (Entry)
		{
			// Instance already running for this port? Should double check pid

			ZEN_WARN("Looks like there is already a process listening to this port (pid: {})", Entry->Pid);

			if (ServerOptions.OwnerPid)
			{
				Entry->AddSponsorProcess(ServerOptions.OwnerPid);

				std::exit(0);
			}
		}

		Entry = ServerState.Register(ServerOptions.BasePort);

		if (ServerOptions.OwnerPid)
		{
			Entry->AddSponsorProcess(ServerOptions.OwnerPid);
		}

		std::unique_ptr<std::thread>	 ShutdownThread;
		std::unique_ptr<zen::NamedEvent> ShutdownEvent;

		zen::ExtendableStringBuilder<64> ShutdownEventName;
		ShutdownEventName << "Zen_" << ServerOptions.BasePort << "_Shutdown";
		ShutdownEvent.reset(new zen::NamedEvent{ShutdownEventName});

		ZenServer Server;
		Server.SetDataRoot(ServerOptions.DataDir);
		Server.SetContentRoot(ServerOptions.ContentDir);
		Server.SetTestMode(ServerOptions.IsTest);
		Server.SetDedicatedMode(ServerOptions.IsDedicated);
		Server.Initialize(ServerOptions, Entry);

		// Monitor shutdown signals

		ShutdownThread.reset(new std::thread{[&] {
			ZEN_INFO("shutdown monitor thread waiting for shutdown signal '{}'", ShutdownEventName);
			if (ShutdownEvent->Wait())
			{
				ZEN_INFO("shutdown signal received");
				Server.RequestExit(0);
			}
			else
			{
				ZEN_INFO("shutdown signal wait() failed");
			}
		}});

		// If we have a parent process, establish the mechanisms we need
		// to be able to communicate readiness with the parent

		Server.SetIsReadyFunc([&] {
			IsReady = true;

			m_LockFile.Update(MakeLockData(), Ec);

			if (!ServerOptions.ChildId.empty())
			{
				zen::NamedEvent ParentEvent{ServerOptions.ChildId};
				ParentEvent.Set();
			}
		});

		Server.Run();
		Server.Cleanup();

		ShutdownEvent->Set();
		ShutdownThread->join();
	}
	catch (std::exception& e)
	{
		SPDLOG_CRITICAL("Caught exception in main: {}", e.what());
	}

	ShutdownLogging();

	return 0;
}

}  // namespace zen

////////////////////////////////////////////////////////////////////////////////

#if ZEN_PLATFORM_WINDOWS

class ZenWindowsService : public WindowsService
{
public:
	ZenWindowsService(ZenServerOptions& ServerOptions) : m_EntryPoint(ServerOptions) {}

	ZenWindowsService(const ZenWindowsService&) = delete;
	ZenWindowsService& operator=(const ZenWindowsService&) = delete;

	virtual int Run() override;

private:
	zen::ZenEntryPoint m_EntryPoint;
};

int
ZenWindowsService::Run()
{
	return m_EntryPoint.Run();
}

#endif	// ZEN_PLATFORM_WINDOWS

////////////////////////////////////////////////////////////////////////////////

#if ZEN_WITH_TESTS
int
test_main(int argc, char** argv)
{
	zen::zencore_forcelinktests();
	zen::zenhttp_forcelinktests();
	zen::zenstore_forcelinktests();
	zen::z$_forcelink();

	zen::logging::InitializeLogging();

	spdlog::set_level(spdlog::level::debug);

	return doctest::Context(argc, argv).run();
}
#endif

int
main(int argc, char* argv[])
{
	using namespace zen;

#if ZEN_USE_MIMALLOC
	mi_version();
#endif

#if ZEN_WITH_TESTS
	if (argc >= 2)
	{
		if (argv[1] == "test"sv)
		{
			return test_main(argc, argv);
		}
	}
#endif

	try
	{
		ZenServerOptions ServerOptions;
		ParseCliOptions(argc, argv, ServerOptions);

		if (!std::filesystem::exists(ServerOptions.DataDir))
		{
			ServerOptions.IsFirstRun = true;
			std::filesystem::create_directories(ServerOptions.DataDir);
		}

#if ZEN_WITH_TRACE
		if (ServerOptions.TraceHost.size())
		{
			TraceInit(ServerOptions.TraceHost.c_str(), TraceType::Network);
		}
		else if (ServerOptions.TraceFile.size())
		{
			TraceInit(ServerOptions.TraceFile.c_str(), TraceType::File);
		}
#endif	// ZEN_WITH_TRACE

#if ZEN_PLATFORM_WINDOWS
		if (ServerOptions.InstallService)
		{
			WindowsService::Install();

			std::exit(0);
		}

		if (ServerOptions.UninstallService)
		{
			WindowsService::Delete();

			std::exit(0);
		}

		ZenWindowsService App(ServerOptions);
		return App.ServiceMain();
#else
		if (ServerOptions.InstallService || ServerOptions.UninstallService)
		{
			throw std::runtime_error("Service mode is not supported on this platform");
		}

		ZenEntryPoint App(ServerOptions);
		return App.Run();
#endif	// ZEN_PLATFORM_WINDOWS
	}
	catch (std::exception& Ex)
	{
		fprintf(stderr, "ERROR: Caught exception in main: '%s'", Ex.what());

		return 1;
	}
}