xD

#include <a_samp>

#define Distance 50.0

new bool:IsAttached[MAX_VEHICLES] = false;
new missile_object[MAX_VEHICLES];
new Float:VehPos[MAX_VEHICLES][3];
new Float:VehCameraPos[MAX_VEHICLES][3];
new Float:VehVectorPos[MAX_VEHICLES][3];
new Float:OffSet[MAX_VEHICLES][3];

const Float:Dist = Distance;

public OnFilterScriptInit()
{
    SetTimer("CheckPos",10,true);
    return 1;
}

forward AttachMissileToVehicle(vehicleid,Float:OffSetX,Float:OffSetY,Float:OffSetZ);
public AttachMissileToVehicle(vehicleid,Float:OffSetX,Float:OffSetY,Float:OffSetZ)
{
    IsAttached[vehicleid] = true;
    OffSet[vehicleid][0] = OffSetX;
    OffSet[vehicleid][1] = OffSetY;
    OffSet[vehicleid][2] = OffSetZ;
    GetVehiclePos(vehicleid,VehPos[vehicleid][0],VehPos[vehicleid][1],VehPos[vehicleid][2]);
    missile_object[vehicleid] = CreateObject(360,VehPos[vehicleid][0]+OffSetX,VehPos[vehicleid][1]+OffSetY,VehPos[vehicleid][2]+OffSetZ,0.0,0.0,0.0,400);
    return 1;
}

forward DeAttachMissileFromVehicle(vehicleid);
public DeAttachMissileFromVehicle(vehicleid)
{
    IsAttached[vehicleid] = false;
    DestroyObject(missile_object[vehicleid]);
    return 1;
}

stock GetVehicleDriver(vehicleid)
{
    for(new i=0; i<MAX_PLAYERS, IsPlayerConnected(i); i++)
    {
        if(GetPlayerVehicleID(i) == vehicleid && GetPlayerState(i) == PLAYER_STATE_DRIVER) return i;
    }
    return INVALID_PLAYER_ID;
}

forward CheckPos();
public CheckPos()
{
    for(new i = 0; i < MAX_VEHICLES; i++)
    {
        if(IsAttached[i] == true)
        {
            GetVehiclePos(i,VehPos[i][0],VehPos[i][1],VehPos[i][2]);
            SetObjectPos(missile_object[i],VehPos[i][0]+OffSet[i][0],VehPos[i][1]+OffSet[i][1],VehPos[i][2]+OffSet[i][2]);
            GetPlayerCameraPos(GetVehicleDriver(i),VehCameraPos[i][0],VehCameraPos[i][1],VehCameraPos[i][2]);
            GetPlayerCameraFrontVector(GetVehicleDriver(i),VehVectorPos[i][0],VehVectorPos[i][1],VehVectorPos[i][2]);
            SetObjectRot(missile_object[i],0.0,-asin(VehVectorPos[i][2]),90 - atan2(VehVectorPos[i][0],VehVectorPos[i][1]));
        }
    }
}

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys & KEY_FIRE)
    {
        if(GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
        {
            for(new i = 0; i < MAX_VEHICLES; i++)
            {
                if(IsAttached[i] == true)
                {
                    if(GetPlayerVehicleID(playerid) == i)
                    {
                        new i2 = GetPlayerVehicleID(playerid);
                        CreateExplosion(VehCameraPos[i2][0]+(VehVectorPos[i2][0] * Dist),VehCameraPos[i2][1]+(VehVectorPos[i2][1] * Dist),VehCameraPos[i2][2]+(VehVectorPos[i2][2] * Dist),7,100);
                    }
                }
            }
        }
    }
    return 1;
}

public OnPlayerCommandText(playerid,cmdtext[])
{
    if(strcmp(cmdtext,"/attachmissile",true) == 0)
    {
        if(GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
        {
            AttachMissileToVehicle(GetPlayerVehicleID(playerid),0,0,1.01);
        }
        else return SendClientMessage(playerid,0xFFFFFFFF,"ERROR: You are not driving any vehicle!");
        return 1;
    }
    return 0;
}

public OnFilterScriptExit()
{
    for(new i = 0; i < MAX_VEHICLES; i++)
    {
        if(IsAttached[i] == true)
        {
            DestroyObject(missile_object[i]);
            IsAttached[i] = false;
        }
    }
    return true;
}