#include < amxmodx >
#include < amxmisc >
#include < fvault >

#define PLUGIN	"Zombie XP"
#define VERSION	"1.0 Beta"
#define AUTHOR	"LondoN eXtream"

#define SAVE_FILE_NAME	"ZPXP_fVault"
#define MAX_LEVEL	10

new g_PlayerName [ 33 ] [ 32 ];
new g_Experience [ 33 ], g_Level [ 33 ];
new g_CvarAmmoPacksDamage;

new const ExperienceNeed [ MAX_LEVEL ] =
{
	0,	//	Level 1
	500,	//	Level 2
	1000,	// 	Level 3
	2000,	//	Level 4
	3500,	//	Level 5
	4000,	//	Level 6
	5500,	//	Level 7
	6300,	//	Level 8
	7200,	//	Level 9
	9000,	//	Level 10
}

public plugin_init ( )
{
	register_plugin ( PLUGIN, VERSION, AUTHOR );
	register_cvar ( "zombie_xp_london", VERSION, FCVAR_SERVER|FCVAR_SPONLY );
	set_cvar_string ( "zombie_xp_london", VERSION );

	g_CvarAmmoPacksDamage = register_cvar ( "zp_xp_damage_for_experience", "500" );

	register_event ( "Damage", "Event_UserMakeDamage", "b", "2!=0" );
	register_event ( "DeathMsg", "Event_UserKillSomeone", "a" );
}

public plugin_natives ( )
{
	register_native ( "zpxp_set_experience", "_set_experience", 1 );
	register_native ( "zpxp_get_experience", "_get_experience", 1 );
	register_native ( "zpxp_set_level", "_set_level", 1 );
	register_native ( "zpxp_get_level", "_get_level", 1 );
}

public _set_experience ( Player, Amount )
{
	if ( !is_user_connected ( Player ) )
		return;

	g_Experience [ Player ] += Amount;

	check_user_level ( Player );
}

public _get_experience ( Player )
{
	return g_Experience [ Player ];
}

public _set_level ( Player, Level )
{
	if ( !is_user_connected ( Player ) )
		return;

	if ( Level > MAX_LEVEL )
		return;

	g_Level [ Player ] = Level;

	g_Experience [ Player ] = ExperienceNeed [ g_Level [ Player ] ];
}

public _get_level ( Player )
{
	return g_Level [ Player ];
}

public Event_UserMakeDamage ( Player )
{
	new Damage = read_data ( 2 );
	new ID = get_user_attacker ( Player );

	if ( ID == Player || !ID || !is_user_alive ( ID ) )
		return;

	while ( Damage >= get_pcvar_num ( g_CvarAmmoPacksDamage ) )
	{
		Damage -= get_pcvar_num ( g_CvarAmmoPacksDamage );
		g_Experience [ ID ] += random_num ( 1, 3 );
	}

	check_user_level ( ID );

}


public Event_UserKillSomeone ( )
{
	new Attacker;	Attacker = read_data ( 1 );
	new Victim;	Victim = read_data ( 2 );

	if ( Attacker == Victim || !Attacker || !is_user_alive ( Attacker ) )
		return;

	g_Experience [ Attacker ] += 20;

	check_user_level ( Attacker );
}

public check_user_level ( Player )
{
	if ( g_Level [ Player ] < MAX_LEVEL )
	{
		while ( g_Experience [ Player ] >= ExperienceNeed [ g_Level [ Player ] ] )
		{
			g_Level [ Player ]++;
		}
	}

	save_user_data ( Player );
}

public client_connect ( Player )
{
	if ( is_user_bot ( Player ) || is_user_hltv ( Player ) )
		return;

	get_user_name ( Player, g_PlayerName [ Player ], charsmax ( g_PlayerName ) );

	load_user_data ( Player );
}

public client_disconnect ( Player )
{
	if ( is_user_bot ( Player ) || is_user_hltv ( Player ) )
		return;

	save_user_data ( Player );
}

public save_user_data ( Player )
{
	new g_String [ 32 ];
	formatex ( g_String, charsmax ( g_String ), "%s %s", g_Level [ Player ], g_Experience [ Player ] );

	fvault_set_data ( SAVE_FILE_NAME, g_PlayerName [ Player ], g_String );
}

public load_user_data ( Player )
{
	new g_String [ 32 ];

	if ( fvault_get_data ( SAVE_FILE_NAME, g_PlayerName [ Player ], g_String, charsmax ( g_String ) ) )
	{
		// a = level | b = experience
		new a [ 16 ], b [ 16 ];
		parse ( g_String, a, charsmax ( a ), b, charsmax ( b ) );

		g_Level [ Player ] = str_to_num ( a );
		g_Experience [ Player ] = str_to_num ( b );
	}
	else
	{
		g_Level [ Player ] = 0;
		g_Experience [ Player ] = 0;
	}
}