#include <a_samp>
#define PRESSED(%0) \
	(((newkeys & (%0)) == (%0)) && ((oldkeys & (%0)) != (%0)))
#define RELEASED(%0) \
	(((newkeys & (%0)) != (%0)) && ((oldkeys & (%0)) == (%0)))
new Float:HP[MAX_PLAYERS];
new pUpdate[MAX_PLAYERS];

forward OPSP_OnPlayerUpdate(playerid);
public OPSP_OnPlayerUpdate(playerid)
{
    pUpdate[playerid]++;
    if(!(pUpdate[playerid] %= 10)) GetPlayerHealth(playerid, HP[playerid]);
    new Keys[3]; GetPlayerKeys(playerid, Keys[0], Keys[1], Keys[2]);
    if(Keys[0] & KEY_FIRE){
	    if(IsPlayerAim(playerid)){
	        FindOnWhoIShot(playerid);
	        return 1;
		}
	}
    return 1;
}

forward OnPlayerShotPlayer(playerid, target, Float:damage);

forward FindOnWhoIShot(playerid);
public FindOnWhoIShot(playerid)
{
	if(IsPlayerAim(playerid))
	{
	    new i = 0, players = GetMaxPlayers();
		while(i < players)
		{
			new Float:HPP;
			GetPlayerHealth(i, HPP);
			if(!IsPlayerConnected(i) || i == playerid || HP[i] == HPP)
			{
			    i++;
			    continue;
			}
			new Float:Pos[3];
			GetPlayerPos(i, Pos[0], Pos[1], Pos[2]);
			if(IsPlayerAimingAt(playerid, Pos[0], Pos[1], Pos[2], 3))
			{
			    OnPlayerShotPlayer(playerid, i, HP[i] - HPP);
			    GetPlayerHealth(i, HP[i]);

			}
			i++;
		}
	}
}

stock IsPlayerAim(playerid)
{
    new animname[32];
    GetAnimationName(GetPlayerAnimationIndex(playerid),animname,32,animname,32);
    if(strfind(animname,"GUN_STAND",true) != -1) return true;
        else if( strfind(animname,"COLT45_FIRE",true) != -1 ) return true;
	return false;
}

stock Float:GetPointAngleToPoint(Float:x2, Float:y2, Float:X, Float:Y) {

  new Float:DX, Float:DY;
  new Float:angle;

  DX = floatabs(floatsub(x2,X));
  DY = floatabs(floatsub(y2,Y));

  if (DY == 0.0 || DX == 0.0) {
    if(DY == 0 && DX > 0) angle = 0.0;
    else if(DY == 0 && DX < 0) angle = 180.0;
    else if(DY > 0 && DX == 0) angle = 90.0;
    else if(DY < 0 && DX == 0) angle = 270.0;
    else if(DY == 0 && DX == 0) angle = 0.0;
  }
  else {
    angle = atan(DX/DY);

    if(X > x2 && Y <= y2) angle += 90.0;
    else if(X <= x2 && Y < y2) angle = floatsub(90.0, angle);
    else if(X < x2 && Y >= y2) angle -= 90.0;
    else if(X >= x2 && Y > y2) angle = floatsub(270.0, angle);
  }

  return floatadd(angle, 90.0);
}

stock GetXYInFrontOfPoint(&Float:x, &Float:y, Float:angle, Float:distance) {
    x += (distance * floatsin(-angle, degrees));
    y += (distance * floatcos(-angle, degrees));
}

Float:DistanceCameraTargetToLocation(Float:CamX, Float:CamY, Float:CamZ, Float:ObjX, Float:ObjY, Float:ObjZ, Float:FrX, Float:FrY, Float:FrZ)
{
	new Float:TGTDistance;
	TGTDistance = floatsqroot((CamX - ObjX) * (CamX - ObjX) + (CamY - ObjY) * (CamY - ObjY) + (CamZ - ObjZ) * (CamZ - ObjZ));
	new Float:tmpX, Float:tmpY, Float:tmpZ;
	tmpX = FrX * TGTDistance + CamX;
	tmpY = FrY * TGTDistance + CamY;
	tmpZ = FrZ * TGTDistance + CamZ;
	return floatsqroot((tmpX - ObjX) * (tmpX - ObjX) + (tmpY - ObjY) * (tmpY - ObjY) + (tmpZ - ObjZ) * (tmpZ - ObjZ));
}

stock IsPlayerAimingAt(playerid, Float:x, Float:y, Float:z, Float:radius)
{
	new Float:camera_x,Float:camera_y,Float:camera_z,Float:vector_x,Float:vector_y,Float:vector_z;
	GetPlayerCameraPos(playerid, camera_x, camera_y, camera_z);
	GetPlayerCameraFrontVector(playerid, vector_x, vector_y, vector_z);
//
    new Float:vertical, Float:horizontal;
//
    switch (GetPlayerWeapon(playerid))
	{
		case 34,35,36:
		{
			if (DistanceCameraTargetToLocation(camera_x, camera_y, camera_z, x, y, z, vector_x, vector_y, vector_z) < radius) return true;
			return false;
		}
		case 30,31: {vertical = 4.0; horizontal = -1.6;}
		case 33: {vertical = 2.7; horizontal = -1.0;}
		default: {vertical = 6.0; horizontal = -2.2;}
    }
//
	new Float:angle = GetPointAngleToPoint(0, 0, floatsqroot(vector_x*vector_x+vector_y*vector_y), vector_z) - 270.0;
	new Float:resize_x, Float:resize_y, Float:resize_z = floatsin(angle+vertical, degrees);
	GetXYInFrontOfPoint(resize_x, resize_y, GetPointAngleToPoint(0, 0, vector_x, vector_y)+horizontal, floatcos(angle+vertical, degrees));
//
 	if (DistanceCameraTargetToLocation(camera_x, camera_y, camera_z, x, y, z, resize_x, resize_y, resize_z) < radius) return true;
	return false;
}