const TASK_SPEED_BOOST = 100

#include <amxmodx>
#include <fakemeta>
#include <hamsandwich>
#include <zombieplague>
 
const TASK_SPEED_BOOST = 500
#define ID_SPEED_BOOST (taskid - TASK_SPEED_BOOST)
 
// Hack to be able to use Ham_Player_ResetMaxSpeed (by joaquimandrade)
new Ham&#58;Ham_Player_ResetMaxSpeed = Ham_Item_PreFrame
 
new g_itemid_boost
new cvar_boost_amount
new cvar_boost_duration
new g_has_speed_boost&#91;33&#93;
 
public plugin_init()
{
	register_plugin("&#91;ZP&#93; Extra Item Speed Boost", "1&#46;2", "MeRcyLeZZ")
 
	g_itemid_boost = zp_register_extra_item("Speed Boost", 5, ZP_TEAM_HUMAN | ZP_TEAM_ZOMBIE)
	cvar_boost_amount = register_cvar("zp_boost_amount", "100&#46;0")
	cvar_boost_duration = register_cvar("zp_boost_duration", "5&#46;0")
 
	RegisterHam(Ham_Player_ResetMaxSpeed, "player", "fw_ResetMaxSpeed_Post", 1)
	RegisterHam(Ham_Killed, "player", "fw_PlayerKilled")
	register_event("HLTV", "event_round_start", "a", "1=0", "2=0")
}
 
public zp_extra_item_selected(player, itemid)
{
	if (itemid == g_itemid_boost)
	{
		// Player frozen (or CS freezetime)
		if (pev(player, pev_maxspeed) <= 1)
		{
			client_print(player, print_chat, "&#91;ZP&#93; You can't use this item when frozen&#46;")
			return ZP_PLUGIN_HANDLED;
		}
 
		// Already using speed boost
		if (g_has_speed_boost&#91;player&#93;)
		{
			client_print(player, print_chat, "&#91;ZP&#93; You already have the speed boost&#46;")
			return ZP_PLUGIN_HANDLED;
		}
 
		// Enable speed boost
		g_has_speed_boost&#91;player&#93; = true
		client_print(player, print_chat, "&#91;ZP&#93; Speed boost enabled!")
 
		// Set the restore speed task
		set_task(get_pcvar_float(cvar_boost_duration), "restore_maxspeed", player+TASK_SPEED_BOOST)
 
		// Update player's maxspeed
		ExecuteHamB(Ham_Player_ResetMaxSpeed, player)
	}
	return PLUGIN_CONTINUE;
}
 
public restore_maxspeed(taskid)
{
	// Disable speed boost
	g_has_speed_boost&#91;ID_SPEED_BOOST&#93; = false
	client_print(ID_SPEED_BOOST, print_chat, "&#91;ZP&#93; Speed boost is over&#46;")
 
	// Update player's maxspeed
	ExecuteHamB(Ham_Player_ResetMaxSpeed, ID_SPEED_BOOST)
}
 
// Remove speed boost task when infected, humanized, killed, or disconnected
public zp_user_infected_pre(id, infector, nemesis)
{
	g_has_speed_boost&#91;id&#93; = false
	remove_task(id+TASK_SPEED_BOOST)
}
public zp_user_humanized_pre(id, survivor)
{
	g_has_speed_boost&#91;id&#93; = false
	remove_task(id+TASK_SPEED_BOOST)
}
public fw_PlayerKilled(victim)
{
	g_has_speed_boost&#91;victim&#93; = false
	remove_task(victim+TASK_SPEED_BOOST)
}
public client_disconnect(id)
{
	g_has_speed_boost&#91;id&#93; = false
	remove_task(id+TASK_SPEED_BOOST)
}
 
// Remove speed boost at round start
public event_round_start()
{
	new id
	for (id = 1; id <= get_maxplayers(); id++)
	{
		g_has_speed_boost&#91;id&#93; = false
		remove_task(id+TASK_SPEED_BOOST)
	}
}
 
public fw_ResetMaxSpeed_Post(id)
{
	if (!is_user_alive(id) || !g_has_speed_boost&#91;id&#93;)
		return;
 
	// Apply speed boost
	new Float&#58;current_maxspeed
	pev(id, pev_maxspeed, current_maxspeed)
	set_pev(id, pev_maxspeed, current_maxspeed + get_pcvar_float(cvar_boost_amount))
}