/*
===========================================================================

Wolfenstein: Enemy Territory GPL Source Code
Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company. 

This file is part of the Wolfenstein: Enemy Territory GPL Source Code (“Wolf ET Source Code”).  

Wolf ET Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Wolf ET Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Wolf ET Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Wolf: ET Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Wolf ET Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <windows.h>
#include <eh.h>

#define MAX_STACK_TRACE_LINES 32

HWND g_hWnd =    NULL;
const char* g_Version = NULL;

typedef int fileHandle_t;

typedef enum {
	FS_READ,
	FS_WRITE,
	FS_APPEND,
	FS_APPEND_SYNC
} fsMode_t;

extern "C" {
void Com_Frame( void );
void Q_strcat( char *dest, int size, const char *src );
void __cdecl Com_sprintf( char *dest, int size, const char *fmt, ... );
int FS_FOpenFileByMode( const char *qpath, fileHandle_t * f, fsMode_t mode );
int FS_Write( const void *buffer, int len, fileHandle_t h );
void FS_FCloseFile( fileHandle_t f );
}

#define CASE( seCode ) case EXCEPTION_ ## seCode: \
	Com_sprintf( minibuffer, sizeof( minibuffer ), "Exception %s (0x%.8x) at address 0x%.8x.", # seCode, EXCEPTION_ ## seCode, m_exPointers->ExceptionRecord->ExceptionAddress ); \
	break;

class CWolfException {
public:
CWolfException( UINT nSeCode, _EXCEPTION_POINTERS* pExcPointers ) {
	m_seCode =      nSeCode;
	m_exPointers =  pExcPointers;
}

~CWolfException() {
}

void BuildErrorMessage( char* buffer, int size ) {
	char minibuffer[256];

	switch ( m_seCode ) {
	case EXCEPTION_ACCESS_VIOLATION:
		Com_sprintf(    minibuffer, sizeof( minibuffer ),
						"Exception ACCESS_VIOLATION (0x%.8x) at address 0x%.8x trying to %s address 0x%.8x.", EXCEPTION_ACCESS_VIOLATION,
						m_exPointers->ExceptionRecord->ExceptionAddress,
						m_exPointers->ExceptionRecord->ExceptionInformation[0] ? "write" : "read",
						m_exPointers->ExceptionRecord->ExceptionInformation[1] );
		break;
		CASE( DATATYPE_MISALIGNMENT );
		CASE( BREAKPOINT );
		CASE( SINGLE_STEP );
		CASE( ARRAY_BOUNDS_EXCEEDED );
		CASE( FLT_DENORMAL_OPERAND );
		CASE( FLT_DIVIDE_BY_ZERO );
		CASE( FLT_INEXACT_RESULT );
		CASE( FLT_INVALID_OPERATION );
		CASE( FLT_OVERFLOW );
		CASE( FLT_STACK_CHECK );
		CASE( FLT_UNDERFLOW );
		CASE( INT_DIVIDE_BY_ZERO );
		CASE( INT_OVERFLOW );
		CASE( PRIV_INSTRUCTION );
		CASE( IN_PAGE_ERROR );
		CASE( ILLEGAL_INSTRUCTION );
		CASE( NONCONTINUABLE_EXCEPTION );
		CASE( STACK_OVERFLOW );
		CASE( INVALID_DISPOSITION );
		CASE( GUARD_PAGE );
		CASE( INVALID_HANDLE );
	default:
		Com_sprintf( minibuffer, sizeof( minibuffer ), "Unknown exception." );
		break;
	}

	Q_strcat( buffer, size, minibuffer );
}

void BuildDump( char* buffer, int size ) {
	char minibuffer[256];

	Com_sprintf(    minibuffer, sizeof( minibuffer ),
					"Exception      : %.8x\r\n"
					"Address        : %.8x\r\n"
					"Access Type    : %s\r\n"
					"Access Address : %.8x\r\n",

					m_exPointers->ExceptionRecord->ExceptionCode,
					m_exPointers->ExceptionRecord->ExceptionAddress,
					m_exPointers->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ? m_exPointers->ExceptionRecord->ExceptionInformation[0] ? "write" : "read" : "NA",
					m_exPointers->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ? m_exPointers->ExceptionRecord->ExceptionInformation[1] : 0 );

	Q_strcat( buffer, size, minibuffer );
}

void BuildRegisters( char* buffer, int size ) {
	char minibuffer[256];

	Com_sprintf( minibuffer, sizeof( minibuffer ),
				 "Registers      : EAX=%.8x CS=%.4x EIP=%.8x EFLGS=%.8x\r\n"
				 "               : EBX=%.8x SS=%.4x ESP=%.8x EBP=%.8x\r\n"
				 "               : ECX=%.8x DS=%.4x ESI=%.8x FS=%.4x\r\n"
				 "               : EDX=%.8x ES=%.4x EDI=%.8x GS=%.4x\r\n",
				 m_exPointers->ContextRecord->Eax,
				 m_exPointers->ContextRecord->SegCs,
				 m_exPointers->ContextRecord->Eip,
				 m_exPointers->ContextRecord->EFlags,
				 m_exPointers->ContextRecord->Ebx,
				 m_exPointers->ContextRecord->SegSs,
				 m_exPointers->ContextRecord->Esp,
				 m_exPointers->ContextRecord->Ebp,
				 m_exPointers->ContextRecord->Ecx,
				 m_exPointers->ContextRecord->SegDs,
				 m_exPointers->ContextRecord->Esi,
				 m_exPointers->ContextRecord->SegFs,
				 m_exPointers->ContextRecord->Edx,
				 m_exPointers->ContextRecord->SegEs,
				 m_exPointers->ContextRecord->Edi,
				 m_exPointers->ContextRecord->SegGs
				 );

	Q_strcat( buffer, size, minibuffer );
}

void BuildStackTrace( char* buffer, int size ) {
	int i, j;
	DWORD* sp;
	DWORD stackTrace[MAX_STACK_TRACE_LINES];

	sp = ( DWORD * )( m_exPointers->ContextRecord->Ebp );
	for ( i = 0; i < MAX_STACK_TRACE_LINES; i++ ) {
		if ( !IsBadReadPtr( sp, sizeof( DWORD ) ) && *sp ) {
			DWORD* np = (DWORD*)*sp;
			stackTrace[i] = *( sp + 1 );

			sp = np;
		} else {
			stackTrace[i] = 0;
		}
	}

	for ( i = 0; i < MAX_STACK_TRACE_LINES; i++ ) {
		if ( i == 0 ) {
			Q_strcat( buffer, size, "Stack Trace    : " );
		} else {
			Q_strcat( buffer, size, "               : " );
		}

		for ( j = 0; j < 4 && i < MAX_STACK_TRACE_LINES; i++, j++ ) {
			char minibuffer[16];
			Com_sprintf( minibuffer, sizeof( minibuffer ), "%.8x ", stackTrace[i] );

			Q_strcat( buffer, size, minibuffer );
		}

		Q_strcat( buffer, size, "\r\n" );
	}

//		MessageBox( g_hWnd, buffer, "Arf!", MB_OK );
}

private:
UINT m_seCode;
_EXCEPTION_POINTERS*    m_exPointers;
};

void WinExceptionHandler( UINT nSeCode, _EXCEPTION_POINTERS* pExcPointers ) {
	CWolfException* we = new CWolfException( nSeCode, pExcPointers );
	throw we;
}

void RunFrame( void ) {
	try {
		// run the game
		Com_Frame();
	}
	catch ( CWolfException* we ) {
		char buffer[2048];
		fileHandle_t handle;

/*		*buffer = '\0';

		we->BuildErrorMessage(	buffer, sizeof( buffer ) );

		MessageBox( g_hWnd, buffer, "Error!", MB_OK | MB_ICONEXCLAMATION );*/

		*buffer = '\0';

		Q_strcat( buffer, sizeof( buffer ), g_Version );
		Q_strcat( buffer, sizeof( buffer ), "\r\n" );

		we->BuildDump(          buffer, sizeof( buffer ) );
		we->BuildRegisters(     buffer, sizeof( buffer ) );
		we->BuildStackTrace(    buffer, sizeof( buffer ) );

		Q_strcat( buffer, sizeof( buffer ), "\r\n" );

		FS_FOpenFileByMode( "crash.log", &handle, FS_APPEND );
		if ( handle ) {
			FS_Write( buffer, strlen( buffer ), handle );
			FS_FCloseFile( handle );
		}

		delete we;

		throw;
	}
}

extern "C" {
void WinSetExceptionWnd( HWND wnd ) {
	if ( wnd ) {
		_set_se_translator( WinExceptionHandler );
	} else {
		_set_se_translator( NULL );
	}

	g_hWnd = wnd;
}

void Com_FrameExt( void ) {
	RunFrame();
}

void WinSetExceptionVersion( const char* version ) {
	g_Version = version;
}
}