/* Copyright (C) 2009-2010, Snares <snares@users.sourceforge.net>
   Copyright (C) 2009-2010, Stefan Hacker <dD0t@users.sourceforge.net>
   Copyright (C) 2005-2010, Thorvald Natvig <thorvald@natvig.com>

   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.
   - Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
   - Neither the name of the Mumble Developers nor the names of its
     contributors may be used to endorse or promote products derived from this
     software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#define _USE_MATH_DEFINES

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <tlhelp32.h>
#include <math.h>

#include "../mumble_plugin.h"

HANDLE h = NULL;

static DWORD getProcess(const wchar_t *exename) {
	PROCESSENTRY32 pe;
	DWORD pid = 0;

	pe.dwSize = sizeof(pe);
	HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	if (hSnap != INVALID_HANDLE_VALUE) {
		BOOL ok = Process32First(hSnap, &pe);

		while (ok) {
			if (wcscmp(pe.szExeFile, exename)==0) {
				pid = pe.th32ProcessID;
				break;
			}
			ok = Process32Next(hSnap, &pe);
		}
		CloseHandle(hSnap);
	}
	return pid;
}

static bool peekProc(VOID *base, VOID *dest, SIZE_T len) {
	SIZE_T r;
	BOOL ok=ReadProcessMemory(h, base, dest, len, &r);
	return (ok && (r == len));
}

static void about(HWND h) {
	::MessageBox(h, L"Reads audio position information from Call of Duty: Modern Warfare 2 Multiplayer v1.0.182.", L"Mumble CoDMW2 MP Plugin", MB_OK);
}


static int fetch(float *avatar_pos, float *avatar_front, float *avatar_top, float *camera_pos, float *camera_front, float *camera_top, std::string &context, std::wstring &identity) {
	float viewHor, viewVer;
	char state;

	for (int i=0;i<3;i++)
		avatar_pos[i] = avatar_front[i] = avatar_top[i] = camera_pos[i] = camera_front[i] = camera_top[i] = 0.0f;

	bool ok;

	/*
		This plugin uses the following Variables:

			Address			Type	Description
			===================================
			0x008F0F78		float	Z-Coordinate
			0x008F0F7C		float	X-Coordinate
			0x008F0F80		float	Y-Coordinate
			0x008F0F88		float	Horizontal view (degrees)
			0x008F0F84		float	Vertical view (degrees)

			0x007F7A34		byte	Magical state value
	*/
	ok = peekProc((BYTE *) 0x007F7A34, &state, 1); // Magical state value
	if (! ok)
		return false;
	/*
		state value is:
		0		while not in game
		1		while playing
		5		while spectating

		This value is used for disabling PA for spectators
		or people not on a server.
	*/
	if (state != 1)
		return true; // This results in all vectors beeing zero which tells mumble to ignore them.

	ok = peekProc((BYTE *) 0x008F0F78, avatar_pos+2, 4) &&	//Z
	     peekProc((BYTE *) 0x008F0F7C, avatar_pos, 4) &&	//X
	     peekProc((BYTE *) 0x008F0F80, avatar_pos+1, 4) && //Y
	     peekProc((BYTE *) 0x008F0F88, &viewHor, 4) && //Hor
	     peekProc((BYTE *) 0x008F0F84, &viewVer, 4); //Ver

	if (! ok)
		return false;

	// Scale Coordinates
	/*
	   Z-Value is increasing when heading north
				  decreasing when heading south
	   X-Value is increasing when heading west
				  decreasing when heading east
	   Y-Value is increasing when going up
				  decreasing when going down
	   40 units = 1 meter (not confirmed)
	*/
	for (int i=0;i<3;i++)
		avatar_pos[i]/=40.0f; // Scale to meters
	avatar_pos[0]*=(-1.0f); // Convert right to left handed

	avatar_top[2] = -1; // Head movement is in front vector

	// Calculate view unit vector
	/*
	   Vertical view 0 when centered
					85	when looking down
				   275 when looking up
	   Decreasing when looking up.

	   Horizontal is 0 when facing North
					90 when facing West
				   180 when facing South
				   270 when facing East
	   Increasing when turning left.
	*/
	viewVer *= static_cast<float>(M_PI / 180.0f);
	viewHor *= static_cast<float>(M_PI / 180.0f);

	avatar_front[0] = -sin(viewHor) * cos(viewVer);
	avatar_front[1] = -sin(viewVer);
	avatar_front[2] = cos(viewHor) * cos(viewVer);

	for (int i=0;i<3;i++) {
		camera_pos[i] = avatar_pos[i];
		camera_front[i] = avatar_front[i];
		camera_top[i] = avatar_top[i];
	}

	return true;
}

static int trylock() {
	h = NULL;
	DWORD pid=getProcess(L"iw4mp.exe");
	if (!pid)
		return false;

	h=OpenProcess(PROCESS_VM_READ, false, pid);
	if (!h)
		return false;

	float apos[3], afront[3], atop[3], cpos[3], cfront[3], ctop[3];
	std::string context;
	std::wstring identity;

	if (fetch(apos, afront, atop, cpos, cfront, ctop, context, identity))
		return true;

	CloseHandle(h);
	h = NULL;
	return false;
}

static void unlock() {
	if (h) {
		CloseHandle(h);
		h = NULL;
	}
}

static const std::wstring longdesc() {
	return std::wstring(L"Supports Call of Duty: Modern Warfare 2 MP v1.0.182 only. No context or identity support yet.");
}

static std::wstring description(L"Call of Duty: Modern Warfare 2 MP v1.0.182");
static std::wstring shortname(L"Call of Duty: Modern Warfare 2 MP");

static MumblePlugin codmw2plug = {
	MUMBLE_PLUGIN_MAGIC,
	description,
	shortname,
	about,
	NULL,
	trylock,
	unlock,
	longdesc,
	fetch
};

extern "C" __declspec(dllexport) MumblePlugin *getMumblePlugin() {
	return &codmw2plug;
}