#include <sourcemod>
#include <sdktools>

new g_iHealth[MAXPLAYERS + 1];
new g_iMaxClients;

public OnPluginStart() {
    HookEntityOutput("item_healthkit_small",  "OnPlayerTouch",    EntityOutput_SaveHealth);
    HookEntityOutput("item_healthkit_medium", "OnPlayerTouch",    EntityOutput_SaveHealth);
    HookEntityOutput("item_healthkit_full",   "OnPlayerTouch",    EntityOutput_SaveHealth);
    HookEntityOutput("prop_dynamic",          "OnAnimationBegun", EntityOutput_SaveHealthAll);
    
    HookEvent("player_hurt",  Event_PlayerHurt);
    HookEvent("player_spawn", Event_PlayerSpawn);
}

public OnMapStart() {
    g_iMaxClients        = GetMaxClients();
}

public EntityOutput_SaveHealth(const String:output[],    caller, activator, Float:delay) {
    g_iHealth[activator] = GetClientHealth(activator);
}

public EntityOutput_SaveHealthAll(const String:output[], caller, activator, Float:delay) {
    for (new i = 1; i <= g_iMaxClients; i++) {
        if (IsClientInGame(i) && !IsClientObserver(i)) {
            g_iHealth[i] = GetClientHealth(i);
        }
    }
}

public Action:Event_PlayerHurt(Handle:event,  const String:name[], bool:dontBroadcast)   {
    new iClient = GetClientOfUserId(GetEventInt(event, "userid")),
        iHealth = GetEventInt(event, "health");
    
    PrintToChat(iClient, "Damage: %d", g_iHealth[iClient] - iHealth);
    
    g_iHealth[iClient]   = iHealth;
}

public Action:Event_PlayerSpawn(Handle:event, const String:name[], bool:dontBroadcast)   {
    CreateTimer(0.1, Timer_SaveHealth, GetClientOfUserId(GetEventInt(event, "userid")));
}

public Action:Timer_SaveHealth(Handle:timer, any:client) {
    g_iHealth[client]    = GetClientHealth(client);
}