#include <amxmodx>
#include <amxmisc>
#include <fakemeta>
#include <hamsandwich>

new g_max_clients;

#define FL_ONGROUND2			(FL_ONGROUND|FL_PARTIALGROUND|FL_INWATER|FL_CONVEYOR|FL_FLOAT)

#define UnitsToMeters(%1)	(%1*0.0254)


new bool:g_bCheckSurf[ 33 ];

new Float:g_oldorigins[33][3];

new Float:meters[33];
public plugin_init()
{
	register_plugin( "meter calculator", "1.0", "-=ThQ=-" );
	register_forward(FM_PlayerPreThink, "client_PreThink");
	g_max_clients = get_maxplayers();

	set_task ( 1.0, "TASK_HUD", _, _, _, "b" );

	RegisterHam ( Ham_Spawn, "player", "Player_Spawn", 1 );
}

public Player_Spawn ( id ) {

	if ( meters [ id ] )
		meters [ id ] = 0.0;

}

public client_PreThink(id)
{
	if( !is_user_alive(id) ) return;
	new bool:on_ground = IsUserOnGround(id);
	if( g_bCheckSurf[ id ] )
	{
		g_bCheckSurf[ id ] = false;
		return;
	}
	//static Float:old_origin[33][3];

	static Float:origin[3];
	pev(id, pev_origin, origin);

	//pev(id, pev_velocity, velocity);

	static Float:gravity;
	//pev(id, pev_maxspeed, maxspeed);
	pev(id, pev_gravity, gravity);

	if(
	pev(id, pev_movetype) != MOVETYPE_WALK
	|| gravity != 1.0
	|| pev(id, pev_waterlevel) > 0
	|| (g_oldorigins[id][0] == origin[0] && g_oldorigins[id][1] == origin[1] && g_oldorigins[id][2] == origin[2] )
	) {

		return;
	}

	if(on_ground)
	{

		meters[id]+=get_distance_f(origin,g_oldorigins[id]);
		pev(id, pev_origin, g_oldorigins[id]);
		//server_print("on ground %f %f %f %f %f",origin[0],origin[1],origin[2],UnitsToMeters(meters[id]), meters[id]);
	}


}

public TASK_HUD ( ) {


	static id;
	for ( id = 1; id <= get_maxplayers ( ); id++ ) {

		if ( is_user_alive ( id ) ) {

			set_hudmessage(255, 255, 255, -1.0, 0.82, 0, 6.0, 1.0)
			show_hudmessage(id, "Meters: %f", UnitsToMeters(meters[id]) )




		}

	}

}

public FwdTouch( iEntity1, iEntity2 )
{
	// player touched something while in the air, so reset the jump
	// this prevents surfing
	//
	// the only problem with this is player could touch a wall during a jump
	// but not lose any speed and this would reset the jump
	//
	// oh well. this prevents surfing, and i'm happy

	if( ( 1 <= iEntity1 <= g_max_clients ) && !IsUserOnGround( iEntity1 ) )
	{
		g_bCheckSurf[ iEntity1 ] = true;
	}

	if( ( 1 <= iEntity2 <= g_max_clients ) && !IsUserOnGround( iEntity2 ) )
	{
		g_bCheckSurf[ iEntity2 ] = true;
	}
}

stock bool:IsUserOnGround(client)
{
	return !!(pev(client, pev_flags) & FL_ONGROUND2);
}