#include "pch.h"
#include "logging.h"
#include "sourceconsole.h"
#include "spdlog/sinks/basic_file_sink.h"
#include "hookutils.h"
#include "dedicated.h"
#include "convar.h"
#include <iomanip>
#include <sstream>
#include <Psapi.h>
#include <minidumpapiset.h>
#include "configurables.h"
#include "rcon_shared.h"
#include "sv_rcon.h"

// This needs to be called after hooks are loaded so we can access the command line args
void CreateLogFiles()
{
	if (strstr(GetCommandLineA(), "-disablelogs"))
	{
		spdlog::default_logger()->set_level(spdlog::level::off);
	}
	else
	{
		// todo: might be good to delete logs that are too old
		time_t time = std::time(nullptr);
		tm currentTime = *std::localtime(&time);
		std::stringstream stream;

		stream << std::put_time(&currentTime, (GetNorthstarPrefix() + "/logs/nslog%Y-%m-%d %H-%M-%S.txt").c_str());
		spdlog::default_logger()->sinks().push_back(std::make_shared<spdlog::sinks::basic_file_sink_mt>(stream.str(), false));
		spdlog::flush_on(spdlog::level::info);
	}
}

long __stdcall ExceptionFilter(EXCEPTION_POINTERS* exceptionInfo)
{
	static bool logged = false;
	if (logged)
		return EXCEPTION_CONTINUE_SEARCH;

	if (!IsDebuggerPresent())
	{
		const DWORD exceptionCode = exceptionInfo->ExceptionRecord->ExceptionCode;
		if (exceptionCode != EXCEPTION_ACCESS_VIOLATION && exceptionCode != EXCEPTION_ARRAY_BOUNDS_EXCEEDED &&
			exceptionCode != EXCEPTION_DATATYPE_MISALIGNMENT && exceptionCode != EXCEPTION_FLT_DENORMAL_OPERAND &&
			exceptionCode != EXCEPTION_FLT_DIVIDE_BY_ZERO && exceptionCode != EXCEPTION_FLT_INEXACT_RESULT &&
			exceptionCode != EXCEPTION_FLT_INVALID_OPERATION && exceptionCode != EXCEPTION_FLT_OVERFLOW &&
			exceptionCode != EXCEPTION_FLT_STACK_CHECK && exceptionCode != EXCEPTION_FLT_UNDERFLOW &&
			exceptionCode != EXCEPTION_ILLEGAL_INSTRUCTION && exceptionCode != EXCEPTION_IN_PAGE_ERROR &&
			exceptionCode != EXCEPTION_INT_DIVIDE_BY_ZERO && exceptionCode != EXCEPTION_INT_OVERFLOW &&
			exceptionCode != EXCEPTION_INVALID_DISPOSITION && exceptionCode != EXCEPTION_NONCONTINUABLE_EXCEPTION &&
			exceptionCode != EXCEPTION_PRIV_INSTRUCTION && exceptionCode != EXCEPTION_STACK_OVERFLOW)
			return EXCEPTION_CONTINUE_SEARCH;

		std::stringstream exceptionCause;
		exceptionCause << "Cause: ";
		switch (exceptionCode)
		{
		case EXCEPTION_ACCESS_VIOLATION:
		case EXCEPTION_IN_PAGE_ERROR:
		{
			exceptionCause << "Access Violation" << std::endl;

			auto exceptionInfo0 = exceptionInfo->ExceptionRecord->ExceptionInformation[0];
			auto exceptionInfo1 = exceptionInfo->ExceptionRecord->ExceptionInformation[1];

			if (!exceptionInfo0)
				exceptionCause << "Attempted to read from: 0x" << (void*)exceptionInfo1;
			else if (exceptionInfo0 == 1)
				exceptionCause << "Attempted to write to: 0x" << (void*)exceptionInfo1;
			else if (exceptionInfo0 == 8)
				exceptionCause << "Data Execution Prevention (DEP) at: 0x" << (void*)std::hex << exceptionInfo1;
			else
				exceptionCause << "Unknown access violation at: 0x" << (void*)exceptionInfo1;

			break;
		}
		case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
			exceptionCause << "Array bounds exceeded";
			break;
		case EXCEPTION_DATATYPE_MISALIGNMENT:
			exceptionCause << "Datatype misalignment";
			break;
		case EXCEPTION_FLT_DENORMAL_OPERAND:
			exceptionCause << "Denormal operand";
			break;
		case EXCEPTION_FLT_DIVIDE_BY_ZERO:
			exceptionCause << "Divide by zero (float)";
			break;
		case EXCEPTION_INT_DIVIDE_BY_ZERO:
			exceptionCause << "Divide by zero (int)";
			break;
		case EXCEPTION_FLT_INEXACT_RESULT:
			exceptionCause << "Inexact result";
			break;
		case EXCEPTION_FLT_INVALID_OPERATION:
			exceptionCause << "Invalid operation";
			break;
		case EXCEPTION_FLT_OVERFLOW:
		case EXCEPTION_INT_OVERFLOW:
			exceptionCause << "Numeric overflow";
			break;
		case EXCEPTION_FLT_UNDERFLOW:
			exceptionCause << "Numeric underflow";
			break;
		case EXCEPTION_FLT_STACK_CHECK:
			exceptionCause << "Stack check";
			break;
		case EXCEPTION_ILLEGAL_INSTRUCTION:
			exceptionCause << "Illegal instruction";
			break;
		case EXCEPTION_INVALID_DISPOSITION:
			exceptionCause << "Invalid disposition";
			break;
		case EXCEPTION_NONCONTINUABLE_EXCEPTION:
			exceptionCause << "Noncontinuable exception";
			break;
		case EXCEPTION_PRIV_INSTRUCTION:
			exceptionCause << "Priviledged instruction";
			break;
		case EXCEPTION_STACK_OVERFLOW:
			exceptionCause << "Stack overflow";
			break;
		default:
			exceptionCause << "Unknown";
			break;
		}

		void* exceptionAddress = exceptionInfo->ExceptionRecord->ExceptionAddress;

		HMODULE crashedModuleHandle;
		GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, static_cast<LPCSTR>(exceptionAddress), &crashedModuleHandle);

		MODULEINFO crashedModuleInfo;
		GetModuleInformation(GetCurrentProcess(), crashedModuleHandle, &crashedModuleInfo, sizeof(crashedModuleInfo));

		char crashedModuleFullName[MAX_PATH];
		GetModuleFileNameExA(GetCurrentProcess(), crashedModuleHandle, crashedModuleFullName, MAX_PATH);
		char* crashedModuleName = strrchr(crashedModuleFullName, '\\') + 1;

		DWORD64 crashedModuleOffset = ((DWORD64)exceptionAddress) - ((DWORD64)crashedModuleInfo.lpBaseOfDll);
		CONTEXT* exceptionContext = exceptionInfo->ContextRecord;

		spdlog::error("Northstar has crashed! a minidump has been written and exception info is available below:");
		spdlog::error(exceptionCause.str());
		spdlog::error("At: {} + {}", crashedModuleName, (void*)crashedModuleOffset);

		PVOID framesToCapture[62];
		int frames = RtlCaptureStackBackTrace(0, 62, framesToCapture, NULL);
		for (int i = 0; i < frames; i++)
		{
			HMODULE backtraceModuleHandle;
			GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, static_cast<LPCSTR>(framesToCapture[i]), &backtraceModuleHandle);

			char backtraceModuleFullName[MAX_PATH];
			GetModuleFileNameExA(GetCurrentProcess(), backtraceModuleHandle, backtraceModuleFullName, MAX_PATH);
			char* backtraceModuleName = strrchr(backtraceModuleFullName, '\\') + 1;

			void* actualAddress = (void*)framesToCapture[i];
			void* relativeAddress = (void*)(uintptr_t(actualAddress) - uintptr_t(backtraceModuleHandle));

			spdlog::error("    {} + {} ({})", backtraceModuleName, relativeAddress, actualAddress);
		}

		spdlog::error("RAX: 0x{0:x}", exceptionContext->Rax);
		spdlog::error("RBX: 0x{0:x}", exceptionContext->Rbx);
		spdlog::error("RCX: 0x{0:x}", exceptionContext->Rcx);
		spdlog::error("RDX: 0x{0:x}", exceptionContext->Rdx);
		spdlog::error("RSI: 0x{0:x}", exceptionContext->Rsi);
		spdlog::error("RDI: 0x{0:x}", exceptionContext->Rdi);
		spdlog::error("RBP: 0x{0:x}", exceptionContext->Rbp);
		spdlog::error("RSP: 0x{0:x}", exceptionContext->Rsp);
		spdlog::error("R8: 0x{0:x}", exceptionContext->R8);
		spdlog::error("R9: 0x{0:x}", exceptionContext->R9);
		spdlog::error("R10: 0x{0:x}", exceptionContext->R10);
		spdlog::error("R11: 0x{0:x}", exceptionContext->R11);
		spdlog::error("R12: 0x{0:x}", exceptionContext->R12);
		spdlog::error("R13: 0x{0:x}", exceptionContext->R13);
		spdlog::error("R14: 0x{0:x}", exceptionContext->R14);
		spdlog::error("R15: 0x{0:x}", exceptionContext->R15);

		time_t time = std::time(nullptr);
		tm currentTime = *std::localtime(&time);
		std::stringstream stream;
		stream << std::put_time(&currentTime, (GetNorthstarPrefix() + "/logs/nsdump%Y-%m-%d %H-%M-%S.dmp").c_str());

		auto hMinidumpFile = CreateFileA(stream.str().c_str(), GENERIC_WRITE, FILE_SHARE_READ, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
		if (hMinidumpFile)
		{
			MINIDUMP_EXCEPTION_INFORMATION dumpExceptionInfo;
			dumpExceptionInfo.ThreadId = GetCurrentThreadId();
			dumpExceptionInfo.ExceptionPointers = exceptionInfo;
			dumpExceptionInfo.ClientPointers = false;

			MiniDumpWriteDump(
				GetCurrentProcess(),
				GetCurrentProcessId(),
				hMinidumpFile,
				MINIDUMP_TYPE(MiniDumpWithIndirectlyReferencedMemory | MiniDumpScanMemory),
				&dumpExceptionInfo,
				nullptr,
				nullptr);
			CloseHandle(hMinidumpFile);
		}
		else
			spdlog::error("Failed to write minidump file {}!", stream.str());

		if (!IsDedicated())
			MessageBoxA(
				0, "Northstar has crashed! Crash info can be found in R2Northstar/logs", "Northstar has crashed!", MB_ICONERROR | MB_OK);
	}

	logged = true;
	return EXCEPTION_EXECUTE_HANDLER;
}

HANDLE hExceptionFilter;

BOOL WINAPI ConsoleHandlerRoutine(DWORD eventCode)
{
	switch (eventCode)
	{
	case CTRL_CLOSE_EVENT:
		// User closed console, shut everything down
		spdlog::info("Exiting due to console close...");
		RemoveVectoredExceptionHandler(hExceptionFilter);
		exit(EXIT_SUCCESS);
		return FALSE;
	}

	return TRUE;
}

void InitialiseLogging()
{
	hExceptionFilter = AddVectoredExceptionHandler(TRUE, ExceptionFilter);

	AllocConsole();
	freopen("CONOUT$", "w", stdout);
	freopen("CONOUT$", "w", stderr);
	spdlog::default_logger()->set_pattern("[%H:%M:%S] [%l] %v");

	SetConsoleCtrlHandler(ConsoleHandlerRoutine, true);
}

ConVar* Cvar_spewlog_enable;

enum SpewType_t
{
	SPEW_MESSAGE = 0,

	SPEW_WARNING,
	SPEW_ASSERT,
	SPEW_ERROR,
	SPEW_LOG,

	SPEW_TYPE_COUNT
};

typedef void (*EngineSpewFuncType)();
EngineSpewFuncType EngineSpewFunc;

void EngineSpewFuncHook(void* engineServer, SpewType_t type, const char* format, va_list args)
{
	if (!Cvar_spewlog_enable->GetBool())
		return;

	const char* typeStr;
	switch (type)
	{
	case SPEW_MESSAGE:
	{
		typeStr = "SPEW_MESSAGE";
		break;
	}

	case SPEW_WARNING:
	{
		typeStr = "SPEW_WARNING";
		break;
	}

	case SPEW_ASSERT:
	{
		typeStr = "SPEW_ASSERT";
		break;
	}

	case SPEW_ERROR:
	{
		typeStr = "SPEW_ERROR";
		break;
	}

	case SPEW_LOG:
	{
		typeStr = "SPEW_LOG";
		break;
	}

	default:
	{
		typeStr = "SPEW_UNKNOWN";
		break;
	}
	}

	char formatted[2048] = {0};
	bool shouldFormat = true;

	// because titanfall 2 is quite possibly the worst thing to yet exist, it sometimes gives invalid specifiers which will crash
	// ttf2sdk had a way to prevent them from crashing but it doesnt work in debug builds
	// so we use this instead
	for (int i = 0; format[i]; i++)
	{
		if (format[i] == '%')
		{
			switch (format[i + 1])
			{
			// this is fucking awful lol
			case 'd':
			case 'i':
			case 'u':
			case 'x':
			case 'X':
			case 'f':
			case 'F':
			case 'g':
			case 'G':
			case 'a':
			case 'A':
			case 'c':
			case 's':
			case 'p':
			case 'n':
			case '%':
			case '-':
			case '+':
			case ' ':
			case '#':
			case '*':
			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9':
				break;

			default:
			{
				shouldFormat = false;
				break;
			}
			}
		}
	}

	if (shouldFormat)
		vsnprintf(formatted, sizeof(formatted), format, args);
	else
	{
		spdlog::warn("Failed to format {} \"{}\"", typeStr, format);
	}

	auto endpos = strlen(formatted);
	if (formatted[endpos - 1] == '\n')
		formatted[endpos - 1] = '\0'; // cut off repeated newline

	spdlog::info("[SERVER {}] {}", typeStr, formatted);

	if (IsDedicated())
	{
		if (CVar_sv_rcon_sendlogs->GetBool())
		{
			char sendbuf[2048] {};
			snprintf(sendbuf, sizeof(sendbuf), "[SERVER %s] %s", typeStr, formatted);
			g_pRConServer->Send(sendbuf);
		}
	}
}

typedef void (*Status_ConMsg_Type)(const char* text, ...);
Status_ConMsg_Type Status_ConMsg_Original;

void Status_ConMsg_Hook(const char* text, ...)
{
	char formatted[2048];
	va_list list;

	va_start(list, text);
	vsprintf_s(formatted, text, list);
	va_end(list);

	auto endpos = strlen(formatted);
	if (formatted[endpos - 1] == '\n')
		formatted[endpos - 1] = '\0'; // cut off repeated newline

	spdlog::info(formatted);

	if (IsDedicated())
	{
		if (CVar_sv_rcon_sendlogs->GetBool())
		{
			g_pRConServer->Send(formatted);
		}
	}
}

typedef bool (*CClientState_ProcessPrint_Type)(__int64 thisptr, __int64 msg);
CClientState_ProcessPrint_Type CClientState_ProcessPrint_Original;

bool CClientState_ProcessPrint_Hook(__int64 thisptr, __int64 msg)
{
	char* text = *(char**)(msg + 0x20);

	auto endpos = strlen(text);
	if (text[endpos - 1] == '\n')
		text[endpos - 1] = '\0'; // cut off repeated newline

	spdlog::info(text);
	return true;
}

void InitialiseEngineSpewFuncHooks(HMODULE baseAddress)
{
	HookEnabler hook;

	ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x11CA80, EngineSpewFuncHook, reinterpret_cast<LPVOID*>(&EngineSpewFunc));

	// Hook print function that status concmd uses to actually print data
	ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x15ABD0, Status_ConMsg_Hook, reinterpret_cast<LPVOID*>(&Status_ConMsg_Original));

	// Hook CClientState::ProcessPrint
	ENABLER_CREATEHOOK(
		hook,
		(char*)baseAddress + 0x1A1530,
		CClientState_ProcessPrint_Hook,
		reinterpret_cast<LPVOID*>(&CClientState_ProcessPrint_Original));

	Cvar_spewlog_enable = new ConVar("spewlog_enable", "1", FCVAR_NONE, "Enables/disables whether the engine spewfunc should be logged");
}

#include "bitbuf.h"

ConVar* Cvar_cl_showtextmsg;

typedef void (*TextMsg_Type)(__int64);
TextMsg_Type TextMsg_Original;

class ICenterPrint
{
  public:
	virtual void ctor() = 0;
	virtual void Clear(void) = 0;
	virtual void ColorPrint(int r, int g, int b, int a, wchar_t* text) = 0;
	virtual void ColorPrint(int r, int g, int b, int a, char* text) = 0;
	virtual void Print(wchar_t* text) = 0;
	virtual void Print(char* text) = 0;
	virtual void SetTextColor(int r, int g, int b, int a) = 0;
};

ICenterPrint* internalCenterPrint = NULL;

void TextMsgHook(BFRead* msg)
{
	int msg_dest = msg->ReadByte();

	char text[256];
	msg->ReadString(text, sizeof(text));

	if (!Cvar_cl_showtextmsg->GetBool())
		return;

	switch (msg_dest)
	{
	case 4: // HUD_PRINTCENTER
		internalCenterPrint->Print(text);
		break;
	default:
		spdlog::warn("Unimplemented TextMsg type {}! printing to console", msg_dest);
		[[fallthrough]];
	case 2: // HUD_PRINTCONSOLE
		auto endpos = strlen(text);
		if (text[endpos - 1] == '\n')
			text[endpos - 1] = '\0'; // cut off repeated newline
		spdlog::info(text);
		break;
	}
}

void InitialiseClientPrintHooks(HMODULE baseAddress)
{
	HookEnabler hook;

	internalCenterPrint = (ICenterPrint*)((char*)baseAddress + 0x216E940);

	// "TextMsg" usermessage
	ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x198710, TextMsgHook, reinterpret_cast<LPVOID*>(&TextMsg_Original));

	Cvar_cl_showtextmsg = new ConVar("cl_showtextmsg", "1", FCVAR_NONE, "Enable/disable text messages printing on the screen.");
}