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

// Zen command line client utility
//

#include "zen.h"

#include "chunk/chunk.h"
#include "cmds/cache.h"
#include "cmds/copy.h"
#include "cmds/dedup.h"
#include "cmds/exportproject.h"
#include "cmds/hash.h"
#include "cmds/importproject.h"
#include "cmds/print.h"
#include "cmds/run.h"
#include "cmds/status.h"
#include "cmds/top.h"
#include "cmds/up.h"
#include "cmds/version.h"

#include <zencore/logging.h>
#include <zencore/scopeguard.h>
#include <zencore/string.h>
#include <zencore/zencore.h>

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

#include <gsl/gsl-lite.hpp>

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

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

class TemplateCommand : public ZenCmdBase
{
public:
	TemplateCommand() { m_Options.add_options()("r,root", "Root directory for CAS pool", cxxopts::value<std::string>(m_RootDirectory)); }

	virtual int Run(const ZenCliOptions& GlobalOptions, int argc, char** argv) override
	{
		ZEN_UNUSED(GlobalOptions, argc, argv);
		return 0;
	}

	virtual cxxopts::Options* Options() override { return &m_Options; }

private:
	cxxopts::Options m_Options{"template", "EDIT THIS COMMAND DESCRIPTION"};
	std::string		 m_RootDirectory;
};

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

#if ZEN_WITH_TESTS

class RunTestsCommand : public ZenCmdBase
{
public:
	virtual int Run(const ZenCliOptions& GlobalOptions, int argc, char** argv) override
	{
		ZEN_UNUSED(GlobalOptions);

		// Set output mode to handle virtual terminal sequences
#	if ZEN_PLATFORM_WINDOWS
		HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
		if (hOut == INVALID_HANDLE_VALUE)
			return GetLastError();

		DWORD dwMode = 0;
		if (!GetConsoleMode(hOut, &dwMode))
			return GetLastError();

		dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
		if (!SetConsoleMode(hOut, dwMode))
			return GetLastError();
#	endif	// ZEN_PLATFORM_WINDOWS

		return ZEN_RUN_TESTS(argc, argv);
	}

	virtual cxxopts::Options* Options() override { return &m_Options; }

private:
	cxxopts::Options m_Options{"runtests", "Run tests"};
};

#endif

//////////////////////////////////////////////////////////////////////////
// TODO: should make this Unicode-aware so we can pass anything in on the
// command line.

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

#if ZEN_USE_MIMALLOC
	mi_version();
#endif

	zen::logging::InitializeLogging();
	MaximizeOpenFileCount();

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

	auto _ = zen::MakeGuard([] { spdlog::shutdown(); });

	HashCommand	 HashCmd;
	CopyCommand	 CopyCmd;
	DedupCommand DedupCmd;
	DropCommand	 DropCmd;
#if ZEN_WITH_EXEC_SERVICES
	RunCommand RunCmd;
#endif
	StatusCommand		 StatusCmd;
	TopCommand			 TopCmd;
	PrintCommand		 PrintCmd;
	PrintPackageCommand	 PrintPkgCmd;
	PsCommand			 PsCmd;
	UpCommand			 UpCmd;
	DownCommand			 DownCmd;
	ExportProjectCommand ExportProjectCmd;
	ImportProjectCommand ImportProjectCmd;
	VersionCommand		 VersionCmd;

#if ZEN_WITH_TESTS
	RunTestsCommand RunTestsCmd;
#endif

	const struct CommandInfo
	{
		const char* CmdName;
		ZenCmdBase* Cmd;
		const char* CmdSummary;
	} Commands[] = {
		// clang-format off
//		{"chunk",		&ChunkCmd,		"Perform chunking"},
		{"copy",		&CopyCmd,		"Copy file(s)"},
		{"dedup",		&DedupCmd,		"Dedup files"},
		{"drop",		&DropCmd,		"Drop cache bucket(s)"},
		{"export-project",		&ExportProjectCmd,		"Export project store oplog"},
		{"hash",		&HashCmd,		"Compute file hashes"},
		{"import-project",		&ImportProjectCmd,		"Import project store oplog"},
		{"print",		&PrintCmd,		"Print compact binary object"},
		{"printpackage", &PrintPkgCmd,	"Print compact binary package"},
#if ZEN_WITH_EXEC_SERVICES
		{"run",			&RunCmd,		"Remote execution"},
#endif // ZEN_WITH_EXEC_SERVICES
		{"status",		&StatusCmd,		"Show zen status"},
		{"ps",			&PsCmd,			"Enumerate running zen server instances"},
		{"top",			&TopCmd,		"Monitor zen server activity"},
		{"up",			&UpCmd,			"Bring zen server up"},
		{"down",		&DownCmd,		"Bring zen server down"},
		{"version",		&VersionCmd,	"Get zen server version"},
	// clang-format on
#if ZEN_WITH_TESTS
		{"runtests", &RunTestsCmd, "Run zen tests"},
#endif
	};

	// Build set containing available commands

	std::unordered_set<std::string> CommandSet;

	for (const auto& Cmd : Commands)
		CommandSet.insert(Cmd.CmdName);

	// Split command line into options, commands and any pass-through arguments

	std::string				 Passthrough;
	std::vector<std::string> PassthroughV;

	for (int i = 1; i < argc; ++i)
	{
		if (strcmp(argv[i], "--") == 0)
		{
			bool							  IsFirst = true;
			zen::ExtendableStringBuilder<256> Line;

			for (int j = i + 1; j < argc; ++j)
			{
				if (!IsFirst)
				{
					Line.AppendAscii(" ");
				}

				std::string_view ThisArg(argv[j]);
				PassthroughV.push_back(std::string(ThisArg));

				const bool NeedsQuotes = (ThisArg.find(' ') != std::string_view::npos);

				if (NeedsQuotes)
				{
					Line.AppendAscii("\"");
				}

				Line.Append(ThisArg);

				if (NeedsQuotes)
				{
					Line.AppendAscii("\"");
				}

				IsFirst = false;
			}

			Passthrough = Line.c_str();

			// This will "truncate" the arg vector and terminate the loop
			argc = i - 1;
		}
	}

	// Split command line into global vs command options. We do this by simply
	// scanning argv for a string we recognise as a command and split it there

	std::vector<char*> CommandArgVec;
	CommandArgVec.push_back(argv[0]);

	for (int i = 1; i < argc; ++i)
	{
		if (CommandSet.find(argv[i]) != CommandSet.end())
		{
			int commandArgCount = /* exec name */ 1 + argc - (i + 1);
			CommandArgVec.resize(commandArgCount);
			std::copy(argv + i + 1, argv + argc, CommandArgVec.begin() + 1);

			argc = i + 1;

			break;
		}
	}

	// Parse global CLI arguments

	ZenCliOptions GlobalOptions;

	GlobalOptions.PassthroughArgs = Passthrough;
	GlobalOptions.PassthroughV	  = PassthroughV;

	std::string SubCommand = "<None>";

	cxxopts::Options Options("zen", "Zen management tool");
	Options.add_options()("d, debug", "Enable debugging", cxxopts::value<bool>(GlobalOptions.IsDebug));
	Options.add_options()("v, verbose", "Enable verbose logging", cxxopts::value<bool>(GlobalOptions.IsVerbose));
	Options.add_options()("help", "Show command line help");
	Options.add_options()("c, command", "Sub command", cxxopts::value<std::string>(SubCommand));

	Options.parse_positional({"command"});

	const bool IsNullInvoke = (argc == 1);	// If no arguments are passed we want to print usage information

	try
	{
		auto ParseResult = Options.parse(argc, argv);

		if (ParseResult.count("help") || IsNullInvoke == 1)
		{
			std::string Help = Options.help();

			printf("%s\n", Help.c_str());

			printf("available commands:\n");

			for (const auto& CmdInfo : Commands)
			{
				printf("  %-10s %s\n", CmdInfo.CmdName, CmdInfo.CmdSummary);
			}

			exit(0);
		}

		if (GlobalOptions.IsDebug)
		{
			spdlog::set_level(spdlog::level::debug);
		}

		for (const CommandInfo& CmdInfo : Commands)
		{
			if (StrCaseCompare(SubCommand.c_str(), CmdInfo.CmdName) == 0)
			{
				cxxopts::Options* VerbOptions = CmdInfo.Cmd->Options();

				try
				{
					return CmdInfo.Cmd->Run(GlobalOptions, (int)CommandArgVec.size(), CommandArgVec.data());
				}
				catch (cxxopts::OptionParseException& Ex)
				{
					if (VerbOptions)
					{
						std::string help = VerbOptions->help();

						printf("Error parsing arguments for command '%s': %s\n\n%s", SubCommand.c_str(), Ex.what(), help.c_str());

						exit(11);
					}
					else
					{
						printf("Error parsing arguments for command '%s': %s\n\n", SubCommand.c_str(), Ex.what());

						exit(11);
					}
				}
			}
		}

		printf("Unknown command specified: '%s', exiting\n", SubCommand.c_str());
	}
	catch (cxxopts::OptionParseException& Ex)
	{
		std::string HelpMessage = Options.help();

		printf("Error parsing snapshot program arguments: %s\n\n%s", Ex.what(), HelpMessage.c_str());

		return 9;
	}
	catch (std::exception& Ex)
	{
		printf("Exception caught from 'main': %s\n", Ex.what());

		return 10;
	}

	return 0;
}