/* 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.
*/

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

#define _USE_MATH_DEFINES
#include <math.h>

#include "../mumble_plugin.h"

HANDLE h;
BYTE *posptr;
BYTE *rotptr;
BYTE *stateptr;

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 BYTE *getModuleAddr(DWORD pid, const wchar_t *modname) {
	MODULEENTRY32 me;
	BYTE *addr = NULL;
	me.dwSize = sizeof(me);
	HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid);
	if (hSnap != INVALID_HANDLE_VALUE) {
		BOOL ok = Module32First(hSnap, &me);

		while (ok) {
			if (wcscmp(me.szModule, modname)==0) {
				addr = me.modBaseAddr;
				break;
			}
			ok = Module32Next(hSnap, &me);
		}
		CloseHandle(hSnap);
	}
	return addr;
}


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 Left 4 Dead (Build 4023).", L"Mumble L4D Plugin", MB_OK);
}

static bool calcout(float *pos, float *rot, float *opos, float *front, float *top) {
	float h = rot[0];
	float v = rot[1];

	if ((v < -180.0f) || (v > 180.0f) || (h < -180.0f) || (h > 180.0f))
		return false;

	h *= static_cast<float>(M_PI / 180.0f);
	v *= static_cast<float>(M_PI / 180.0f);

	// Seems L4D is in inches. INCHES?!?
	opos[0] = pos[0] / 39.37f;
	opos[1] = pos[2] / 39.37f;
	opos[2] = pos[1] / 39.37f;

	front[0] = cos(v) * cos(h);
	front[1] = -sin(h);
	front[2] = sin(v) * cos(h);

	h -= static_cast<float>(M_PI / 2.0f);

	top[0] = cos(v) * cos(h);
	top[1] = -sin(h);
	top[2] = sin(v) * cos(h);
	/*
		printf("Poll\n");
		printf("%f %f %f : %f %f\n",pos[0],pos[1],pos[2], rot[0], rot[1]);
		printf("%f %f %f :: %.2f %.2f %.2f :: %.2f %.2f %.2f\n", opos[0], opos[1], opos[2], front[0], front[1], front[2], top[0], top[1], top[2]);
	*/
	return true;
}

static int trylock() {
	h = NULL;
	posptr = rotptr = NULL;

	DWORD pid=getProcess(L"left4dead.exe");
	if (!pid)
		return false;

	BYTE *mod=getModuleAddr(pid, L"client.dll");
	if (!mod)
		return false;

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

	posptr = mod + 0x580588;
	rotptr = mod + 0x4FF024;
	stateptr = mod + 0x4F8E34;

	float pos[3];
	float rot[3];
	float opos[3], top[3], front[3];

	bool ok = peekProc(posptr, pos, 12) &&
	          peekProc(rotptr, rot, 12);

	if (ok)
		return calcout(pos, rot, opos, top, front);

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

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

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) {
	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;

	float ipos[3], rot[3];
	bool ok;
	char state;

	ok = peekProc(posptr, ipos, 12) &&
	     peekProc(rotptr, rot, 12) &&
	     peekProc(stateptr, &state, 1);

	if (state == 0)
		return true; // This results in all vectors beeing zero which tells Mumble to ignore them.

	if (ok) {
		int res = calcout(ipos, rot, avatar_pos, avatar_front, avatar_top);
		if (res) {
			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];

				// Example only -- only set these when you have sane values, and make sure they're pretty constant (every change causes a sever message).
				context = std::string("server/map/blah");
				identity = std::wstring(L"STEAM_1:2:3456789");
			}
			return res;
		}
	}

	return false;
}

static const std::wstring longdesc() {
	return std::wstring(L"Supports L4D version 4023 only. Supports no fancy stuff.");
}

static std::wstring description(L"Left 4 Dead (Build 4023)");
static std::wstring shortname(L"Left 4 Dead");

static MumblePlugin l4dplug = {
	MUMBLE_PLUGIN_MAGIC,
	description,
	shortname,
	about,
	NULL,
	trylock,
	unlock,
	longdesc,
	fetch
};

extern "C" __declspec(dllexport) MumblePlugin *getMumblePlugin() {
	return &l4dplug;
}