path: root/src/items.cpp

// items.cpp — item ESP (discovery, classification, drawing).
#include "esp_internal.h"
#include "hl2h.h"
#include <cmath>
#include <cstdio>
#include <cstring>


enum ItemKind {
  IK_HEALTH,
  IK_AMMO,
  IK_ARMOR,
  IK_WEAPON,
  IK_CRATE,
  IK_OTHER
};

struct ItemTarget {
  int idx;
  int kind;
  int ammo_type; // m_iAmmo index for IK_AMMO, -1 otherwise
  Vector origin;
  char label[128];
};

static ItemTarget g_item_targets[192];
static int g_nitems = 0;
static bool g_items_logged = false;

static bool item_icontains(const char *hay, const char *needle) {
  if (!hay || !needle || !*needle)
    return false;
  size_t n = strlen(needle);
  for (const char *p = hay; *p; p++)
    if (strncasecmp(p, needle, n) == 0)
      return true;
  return false;
}

static bool item_handle_valid(uint32_t h) {
  return h != 0 && h != 0xFFFFFFFFu;
}

// Weapons held by the player or an NPC are not world pickups.
bool item_weapon_is_owned(void *ent) {
  if (!ent)
    return false;
  if (g_net.owner >= 0) {
    uint32_t h = *(uint32_t *)((uintptr_t)ent + g_net.owner);
    if (item_handle_valid(h))
      return true;
  }
  if (g_net.weapon_owner >= 0) {
    uint32_t h = *(uint32_t *)((uintptr_t)ent + g_net.weapon_owner);
    if (item_handle_valid(h))
      return true;
  }
  return false;
}

// Entity index of the weapon's owner, or -1. Used to distinguish the local
// player's inventory from NPC weapons.
static int item_weapon_owner_idx(void *ent) {
  if (!ent)
    return -1;
  uint32_t h = 0;
  if (g_net.owner >= 0)
    h = *(uint32_t *)((uintptr_t)ent + g_net.owner);
  if (!item_handle_valid(h) && g_net.weapon_owner >= 0)
    h = *(uint32_t *)((uintptr_t)ent + g_net.weapon_owner);
  if (!item_handle_valid(h))
    return -1;
  return (int)(h & 0x7FF);
}

static int local_active_weapon_idx(int local_idx) {
  if (local_idx <= 0 || g_net.activeweapon < 0)
    return -1;
  void *local = entitylist_get(local_idx);
  if (!local)
    return -1;
  uint32_t h = *(uint32_t *)((uintptr_t)local + g_net.activeweapon);
  if (!item_handle_valid(h))
    return -1;
  return (int)(h & 0x7FF);
}

static int classify_weapon(const char *model, const char *cls, char *label,
                           size_t outn) {
  if (!item_icontains(model, "models/weapons/w_") &&
      !item_icontains(cls, "weapon"))
    return 0;
  if (item_icontains(model, "w_crowbar"))
    snprintf(label, outn, "Crowbar");
  else if (item_icontains(model, "w_pistol"))
    snprintf(label, outn, "Pistol");
  else if (item_icontains(model, "w_357"))
    snprintf(label, outn, "Revolver");
  else if (item_icontains(model, "w_smg1") ||
           item_icontains(model, "w_smg2"))
    snprintf(label, outn, "SMG");
  else if (item_icontains(model, "w_ar2") ||
           item_icontains(model, "w_irifle"))
    snprintf(label, outn, "AR2");
  else if (item_icontains(model, "w_shotgun"))
    snprintf(label, outn, "Shotgun");
  else if (item_icontains(model, "w_crossbow"))
    snprintf(label, outn, "Crossbow");
  else if (item_icontains(model, "w_rocket_launcher"))
    snprintf(label, outn, "RPG");
  else if (item_icontains(model, "w_frag") ||
           item_icontains(model, "w_grenade"))
    snprintf(label, outn, "Grenade");
  else if (item_icontains(model, "w_physcannon") ||
           item_icontains(model, "w_physics"))
    snprintf(label, outn, "Gravity gun");
  else if (item_icontains(model, "w_stunstick") ||
           item_icontains(model, "w_stunbaton"))
    snprintf(label, outn, "Stunstick");
  else if (item_icontains(model, "w_bugbait"))
    snprintf(label, outn, "Bugbait");
  else if (item_icontains(model, "w_sniper"))
    snprintf(label, outn, "Sniper");
  else if (item_icontains(model, "w_slam"))
    snprintf(label, outn, "SLAM");
  else
    snprintf(label, outn, "%s", model);
  return 1;
}

// Weapon identity for the "owned weapon -> fallen weapon is ammo" rule.
enum {
  WT_NONE = 0,
  WT_PISTOL,
  WT_357,
  WT_SMG,
  WT_AR2,
  WT_SHOTGUN,
  WT_CROSSBOW,
  WT_RPG,
  WT_GRENADE,
  WT_SNIPER,
  WT_COUNT
};

static int weapon_type_id(const char *model, const char *cls) {
  if (item_icontains(model, "pistol") || item_icontains(cls, "pistol"))
    return WT_PISTOL;
  if (item_icontains(model, "357") || item_icontains(cls, "357"))
    return WT_357;
  if (item_icontains(model, "smg") || item_icontains(cls, "smg"))
    return WT_SMG;
  if (item_icontains(model, "ar2") || item_icontains(model, "irifle") ||
      item_icontains(cls, "ar2") || item_icontains(cls, "irifle"))
    return WT_AR2;
  if (item_icontains(model, "shotgun") || item_icontains(cls, "shotgun"))
    return WT_SHOTGUN;
  if (item_icontains(model, "crossbow") || item_icontains(cls, "crossbow"))
    return WT_CROSSBOW;
  if (item_icontains(model, "rocket") || item_icontains(cls, "rpg"))
    return WT_RPG;
  if (item_icontains(model, "grenade") || item_icontains(cls, "frag"))
    return WT_GRENADE;
  if (item_icontains(model, "sniper") || item_icontains(cls, "sniper"))
    return WT_SNIPER;
  return WT_NONE;
}

static int weapon_ammo_type(int wt) {
  switch (wt) {
  case WT_PISTOL: return 2;
  case WT_357: return 4;
  case WT_SMG: return 3;
  case WT_AR2: return 0;
  case WT_SHOTGUN: return 6;
  case WT_CROSSBOW: return 5;
  case WT_RPG: return 7;
  case WT_GRENADE: return 11;
  case WT_SNIPER: return 9;
  default: return -1;
  }
}

// Ammo type index used by CBasePlayer::m_iAmmo (order of AddAmmoType in
// hl2_gamerules.cpp).
static int item_ammo_type(const char *model) {
  if (!model)
    return -1;
  if (item_icontains(model, "boxsrounds") ||
      item_icontains(model, "ammocrate_pistol") ||
      item_icontains(model, "w_pistol"))
    return 2;
  if (item_icontains(model, "boxmrounds") ||
      item_icontains(model, "ammocrate_smg1"))
    return 3;
  if (item_icontains(model, "boxlrounds") ||
      item_icontains(model, "combine_rifle") ||
      item_icontains(model, "ammocrate_ar2") ||
      item_icontains(model, "w_ar2") || item_icontains(model, "w_irifle"))
    return 0;
  if (item_icontains(model, "357ammo") ||
      item_icontains(model, "357ammobox") ||
      item_icontains(model, "w_357"))
    return 4;
  if (item_icontains(model, "crossbowrounds") ||
      item_icontains(model, "w_crossbow"))
    return 5;
  if (item_icontains(model, "boxbuckshot") ||
      item_icontains(model, "ammocrate_buckshot") ||
      item_icontains(model, "w_shotgun"))
    return 6;
  if (item_icontains(model, "w_missile_closed") ||
      item_icontains(model, "ammocrate_rockets") ||
      item_icontains(model, "w_rocket_launcher"))
    return 7;
  if (item_icontains(model, "ar2_grenade") ||
      item_icontains(model, "ammocrate_smg2") ||
      item_icontains(model, "smg1_grenade") ||
      item_icontains(model, "smg_grenade"))
    return 8;
  if (item_icontains(model, "ammocrate_grenade") ||
      item_icontains(model, "w_grenade") ||
      item_icontains(model, "w_frag") ||
      item_icontains(model, "frag_grenade") ||
      item_icontains(model, "items/grenade"))
    return 11;
  if (item_icontains(model, "w_smg1") || item_icontains(model, "w_smg2"))
    return 3;
  return -1;
}

static int convar_int(const char *name) {
  if (!g_iface.cvar || !name)
    return -1;
  using FindFn = void *(*)(void *, const char *);
  void *v = vfunc<FindFn>(g_iface.cvar, 12)(g_iface.cvar, name);
  if (!v)
    return -1;
  return (int)*(float *)((uintptr_t)v + 0x2c); // ConVar m_Value.f
}

// Maximum reserve ammo for an m_iAmmo index. Prefers the sk_max_* cvar and
// falls back to the stock HL2 cap so the RPG's 3-rocket limit is honoured
// even when server cvars are not visible from the client.
static int ammo_max(int type) {
  static int cache[16];
  static bool init = false;
  if (type < 0 || type >= 16)
    return -1;
  if (!init) {
    for (int i = 0; i < 16; i++)
      cache[i] = -2;
    init = true;
  }
  if (cache[type] != -2)
    return cache[type];
  const char *name = nullptr;
  int stock = -1;
  switch (type) {
  case 0: name = "sk_max_ar2"; stock = 60; break;
  case 2: name = "sk_max_pistol"; stock = 150; break;
  case 3: name = "sk_max_smg1"; stock = 225; break;
  case 4: name = "sk_max_357"; stock = 12; break;
  case 5: name = "sk_max_crossbow"; stock = 10; break;
  case 6: name = "sk_max_buckshot"; stock = 30; break;
  case 7: name = "sk_max_rpg_round"; stock = 3; break;
  case 8: name = "sk_max_smg1_grenade"; stock = 3; break;
  case 9: name = "sk_max_sniper_round"; stock = 30; break;
  case 11: name = "sk_max_grenade"; stock = 5; break;
  default: break;
  }
  int v = convar_int(name);
  if (v <= 0)
    v = stock;
  cache[type] = v;
  return v;
}

static int local_ammo(void *local_ent, int type) {
  if (type < 0 || type >= 32)
    return -1;
  // Prefer the authoritative server array; the client m_iAmmo netvar offset
  // can be off by an element, which made "full" counts flicker as other ammo
  // was spent. server_player_ammo already skips the CNetworkArray header.
  int local = engine_get_local_player();
  if (local > 0 && g_iface.engineserver) {
    resolve_server_netvars();
    int s = server_player_ammo(local, type);
    if (s >= 0)
      return s;
  }
  if (local_ent && g_net.ammo >= 0)
    return *(int *)((uintptr_t)local_ent + g_net.ammo + type * 4);
  return -1;
}

static int classify_item(const char *model, const char *cls, char *label,
                         size_t outn) {
  if (!model && !cls)
    return -1;

  // Breakable prop chunks are debris, not pickups.
  if (item_icontains(model, "chunk"))
    return -1;

  if (item_icontains(model, "healthkit")) {
    snprintf(label, outn, "Medkit");
    return IK_HEALTH;
  }
  if (item_icontains(model, "healthvial")) {
    snprintf(label, outn, "Health vial");
    return IK_HEALTH;
  }
  if (item_icontains(model, "health_charger")) {
    snprintf(label, outn, "Health charger");
    return IK_HEALTH;
  }
  if (item_icontains(model, "battery")) {
    snprintf(label, outn, "Battery");
    return IK_ARMOR;
  }
  if (item_icontains(model, "hevsuit")) {
    snprintf(label, outn, "HEV suit");
    return IK_ARMOR;
  }
  if (item_icontains(model, "w_longjump")) {
    snprintf(label, outn, "Long jump");
    return IK_ARMOR;
  }
  if (item_icontains(model, "suit_charger")) {
    snprintf(label, outn, "Suit charger");
    return IK_ARMOR;
  }

  // Only the two item-crate models are supply crates. Other crates are just
  // breakable map props and deliberately not tagged.
  if (item_icontains(model, "item_item_crate") ||
      item_icontains(model, "item_beacon_crate")) {
    snprintf(label, outn, "Supply crate");
    return IK_CRATE;
  }

  if (item_icontains(model, "ammocrate_pistol")) {
    snprintf(label, outn, "Pistol ammo crate");
    return IK_AMMO;
  }
  if (item_icontains(model, "ammocrate_smg1")) {
    snprintf(label, outn, "SMG ammo crate");
    return IK_AMMO;
  }
  if (item_icontains(model, "ammocrate_ar2")) {
    snprintf(label, outn, "AR2 ammo crate");
    return IK_AMMO;
  }
  if (item_icontains(model, "ammocrate_rockets")) {
    snprintf(label, outn, "RPG ammo crate");
    return IK_AMMO;
  }
  if (item_icontains(model, "ammocrate_buckshot")) {
    snprintf(label, outn, "Shotgun ammo crate");
    return IK_AMMO;
  }
  if (item_icontains(model, "ammocrate_grenade")) {
    snprintf(label, outn, "Grenade crate");
    return IK_AMMO;
  }
  if (item_icontains(model, "ammocrate_smg2")) {
    snprintf(label, outn, "SMG grenade crate");
    return IK_AMMO;
  }
  if (item_icontains(model, "ammocrate")) {
    snprintf(label, outn, "Ammo crate");
    return IK_AMMO;
  }

  if (item_icontains(model, "w_missile_closed")) {
    snprintf(label, outn, "RPG rocket");
    return IK_AMMO;
  }
  if (item_icontains(model, "boxsrounds")) {
    snprintf(label, outn, "Pistol ammo");
    return IK_AMMO;
  }
  if (item_icontains(model, "boxmrounds")) {
    snprintf(label, outn, "SMG ammo");
    return IK_AMMO;
  }
  if (item_icontains(model, "boxlrounds") ||
      item_icontains(model, "combine_rifle_cartridge") ||
      item_icontains(model, "combine_rifle_ammo")) {
    snprintf(label, outn, "AR2 ammo");
    return IK_AMMO;
  }
  if (item_icontains(model, "357ammo") ||
      item_icontains(model, "357ammobox")) {
    snprintf(label, outn, ".357 ammo");
    return IK_AMMO;
  }
  if (item_icontains(model, "crossbowrounds")) {
    snprintf(label, outn, "Crossbow bolts");
    return IK_AMMO;
  }
  if (item_icontains(model, "boxbuckshot")) {
    snprintf(label, outn, "Shotgun shells");
    return IK_AMMO;
  }
  if (item_icontains(model, "boxsniperrounds")) {
    snprintf(label, outn, "Sniper ammo");
    return IK_AMMO;
  }
  if (item_icontains(model, "boxflares") ||
      item_icontains(model, "models/items/flare")) {
    snprintf(label, outn, "Flares");
    return IK_AMMO;
  }
  if (item_icontains(model, "ar2_grenade")) {
    snprintf(label, outn, "AR2 grenade");
    return IK_AMMO;
  }
  if (item_icontains(model, "w_grenade") ||
      item_icontains(model, "w_frag") ||
      item_icontains(model, "frag_grenade") ||
      item_icontains(model, "items/grenade")) {
    snprintf(label, outn, "Frag grenade");
    return IK_AMMO;
  }
  if (item_icontains(model, "models/items/")) {
    snprintf(label, outn, "Ammo");
    return IK_AMMO;
  }

  if (classify_weapon(model, cls, label, outn) == 1)
    return IK_WEAPON;

  if (item_icontains(cls, "healthkit") || item_icontains(cls, "healthvial") ||
      item_icontains(cls, "wallhealth") ||
      item_icontains(cls, "healthcharger")) {
    snprintf(label, outn, "Health");
    return IK_HEALTH;
  }
  if (item_icontains(cls, "battery") || item_icontains(cls, "itemsuit") ||
      item_icontains(cls, "recharge")) {
    snprintf(label, outn, "Armor");
    return IK_ARMOR;
  }
  if (item_icontains(cls, "itemcrate")) {
    snprintf(label, outn, "Supply crate");
    return IK_CRATE;
  }
  if (item_icontains(cls, "item_ammo") || item_icontains(cls, "itemammo")) {
    snprintf(label, outn, "Ammo");
    return IK_AMMO;
  }
  if (item_icontains(cls, "weapon")) {
    snprintf(label, outn, "Weapon");
    return IK_WEAPON;
  }
  if (item_icontains(cls, "item") || item_icontains(cls, "pickup")) {
    snprintf(label, outn, "Item");
    return IK_OTHER;
  }
  return -1;
}

static bool item_kind_enabled(int kind) {
  switch (kind) {
  case IK_HEALTH: return g_item_health;
  case IK_AMMO: return g_item_ammo;
  case IK_ARMOR: return g_item_armor;
  case IK_WEAPON: return g_item_weapons;
  case IK_CRATE: return g_item_crates;
  default: return true;
  }
}

// Health chargers are brushes (func_healthcharger/CWallHealth) and suit
// chargers are item_suitcharger/CNewRecharge. Both expose m_iJuice.
static bool item_is_charger(const char *model, const char *cls) {
  return item_icontains(model, "charger") ||
         item_icontains(model, "suit_charger") ||
         item_icontains(cls, "charger") ||
         item_icontains(cls, "wallhealth") ||
         item_icontains(cls, "recharge");
}

static bool item_is_suit_charger(const char *model, const char *cls) {
  return item_icontains(model, "suit_charger") ||
         item_icontains(model, "suitcharger") ||
         item_icontains(cls, "recharge") ||
         item_icontains(cls, "suitcharger");
}

static void items_collect(int local_idx) {
  static double last_scan = 0.0;
  double now = esp_now();
  if (now - last_scan < 0.10)
    return;
  last_scan = now;
  g_nitems = 0;
  if (!g_iface.entitylist || g_net.origin < 0 || g_net.modelindex < 0)
    return;
  resolve_server_netvars();

  using Fn = int (*)(void *);
  int hi = vfunc<Fn>(g_iface.entitylist, 6)(g_iface.entitylist);
  if (hi < 0 || hi > 4096)
    hi = 4096;
  int active_idx = local_active_weapon_idx(local_idx);

  // Which weapon types the local player already carries. A fallen weapon of
  // the same type is then just an ammo pickup. Owner handles are unreliable on
  // this client (owner/weapon_owner netvars resolve to -1), so remember every
  // type the player has held since the current local entity appeared.
  static uint32_t owned_mask = 0;
  static void *last_local = nullptr;
  void *local_ent = entitylist_get(local_idx);
  if (local_ent != last_local) {
    last_local = local_ent;
    owned_mask = 0;
  }
  int owned_idx = active_idx;
  if (owned_idx <= 0 && g_iface.engineserver) {
    resolve_server_netvars();
    owned_idx = server_active_weapon(local_idx);
  }
  if (owned_idx > 0) {
    void *aw = entitylist_get(owned_idx);
    void *anet = entity_networkable(owned_idx);
    const char *acls = anet ? entity_class_name(anet, nullptr) : nullptr;
    const char *amodel = aw ? entity_model_name(aw) : nullptr;
    int at = weapon_type_id(amodel, acls);
    if (at > 0)
      owned_mask |= 1u << at;
  }
  for (int idx = 1; idx <= hi; idx++) {
    if (idx == local_idx)
      continue;
    void *ent = entitylist_get(idx);
    if (!ent || item_weapon_owner_idx(ent) != local_idx)
      continue;
    void *net = entity_networkable(idx);
    const char *cls = net ? entity_class_name(net, nullptr) : nullptr;
    const char *model = entity_model_name(ent);
    int wt = weapon_type_id(model, cls);
    if (wt > 0)
      owned_mask |= 1u << wt;
  }
  // Server-side inventory, independent of the client recv-table arrays.
  if (g_iface.engineserver) {
    for (int slot = 0; slot < 48; slot++) {
      uint32_t h = server_player_weapon(local_idx, slot);
      if (!item_handle_valid(h))
        continue;
      int wi = (int)(h & 0x7FF);
      if (wi <= 0 || wi > 4096)
        continue;
      void *wep = entitylist_get(wi);
      void *net = entity_networkable(wi);
      const char *wc = net ? entity_class_name(net, nullptr) : nullptr;
      const char *wm = wep ? entity_model_name(wep) : nullptr;
      if (!wm) {
        void *sb = nullptr;
        server_entity_health(wi, nullptr, nullptr, &sb);
        if (sb)
          wm = model_name_from_index(server_model_index(sb));
      }
      int wt = weapon_type_id(wm, wc);
      if (wt > 0)
        owned_mask |= 1u << wt;
    }
  }
  bool owned_weapon[WT_COUNT] = {};
  for (int t = 1; t < WT_COUNT; t++)
    owned_weapon[t] = (owned_mask & (1u << t)) != 0;
  static bool cats_logged = false;
  if (!cats_logged) {
    cats_logged = true;
    char maxbuf[16];
    if (g_item_max_dist == 0)
      snprintf(maxbuf, sizeof(maxbuf), "All");
    else
      snprintf(maxbuf, sizeof(maxbuf), "%d", g_item_max_dist);
    logf("items: categories health=%d ammo=%d armor=%d weapons=%d "
         "crates=%d distance=%d max=%s",
         (int)g_item_health, (int)g_item_ammo, (int)g_item_armor,
         (int)g_item_weapons, (int)g_item_crates, (int)g_item_distance,
         maxbuf);
  }
  static int dbg_lines = 0;
  static bool owner_warned = false;
  if (!owner_warned && g_net.owner < 0 && g_net.weapon_owner < 0) {
    owner_warned = true;
    logf("items: weapon owner netvar unavailable; held weapons may tag");
  }

  for (int idx = 1; idx <= hi && g_nitems < 192; idx++) {
    if (idx == local_idx)
      continue;
    void *ent = entitylist_get(idx);
    if (!ent)
      continue;
    void *net = entity_networkable(idx);
    if (!net || entity_is_dormant(net))
      continue;
    const char *cls = entity_class_name(net, nullptr);
    const char *scls = nullptr;
    if (g_iface.engineserver &&
        (!cls || !*cls || strcmp(cls, "CBaseEntity") == 0))
      scls = server_entity_classname(idx);
    const char *model = entity_model_name(ent);
    // CPhysicsProp's client m_nModelIndex is often 0 (e.g. item_item_crate);
    // fall back to the server entity's model index, which is set in Spawn().
    if ((!model || !*model) && g_iface.engineserver) {
      void *sbase = nullptr;
      server_entity_health(idx, nullptr, nullptr, &sbase);
      if (sbase)
        model = model_name_from_index(server_model_index(sbase));
    }
    char label[128];
    int kind = classify_item(model, cls, label, sizeof(label));
    if (kind < 0 && scls)
      kind = classify_item(model, scls, label, sizeof(label));
    if (kind < 0)
      continue;
    // Health/suit chargers are dispensers that stay useful after a refill, but
    // an empty suit charger cannot give anything. The health charger's
    // m_iJuice offset is still being verified (it read 0 on a full charger),
    // so it is left visible for now; server_item_juice logs both candidate
    // values for diagnosis.
    bool is_charger = item_is_charger(model, cls) ||
                      (scls && item_is_charger(model, scls));
    bool is_suit = item_is_suit_charger(model, cls) ||
                   (scls && item_is_suit_charger(model, scls));
    if (is_charger) {
      int juice = server_item_juice(idx);
      if (is_suit && juice == 0)
        continue;
    }

    Vector origin{*(float *)((uintptr_t)ent + g_net.origin),
                  *(float *)((uintptr_t)ent + g_net.origin + 4),
                  *(float *)((uintptr_t)ent + g_net.origin + 8)};
    float dx = origin.x - g_cam_eye.x;
    float dy = origin.y - g_cam_eye.y;
    float dz = origin.z - g_cam_eye.z;
    float dist = sqrtf(dx * dx + dy * dy + dz * dz);

    if (kind == IK_WEAPON) {
      if (idx == active_idx || item_weapon_is_owned(ent))
        continue;
      int wt = weapon_type_id(model, cls);
      if (wt > 0 && owned_weapon[wt]) {
        char base_label[160];
        snprintf(base_label, sizeof(base_label), "%s", label);
        snprintf(label, sizeof(label), "%.100s ammo", base_label);
        kind = IK_AMMO;
      }
    }
    // Distance applies to every tag; 0 means unlimited.
    if (g_item_max_dist > 0 && dist > (float)g_item_max_dist)
      continue;

    ItemTarget &t = g_item_targets[g_nitems++];
    t.idx = idx;
    t.kind = kind;
    t.ammo_type = -1;
    if (kind == IK_AMMO) {
      t.ammo_type = item_ammo_type(model);
      if (t.ammo_type < 0)
        t.ammo_type = weapon_ammo_type(weapon_type_id(model, cls));
    }
    t.origin = origin;
    snprintf(t.label, sizeof(t.label), "%s", label);
    if (dbg_lines < 8) {
      dbg_lines++;
      logd("item: idx=%d kind=%d cls=%s model=%s", idx, kind,
           cls ? cls : "?", model ? model : "?");
    }
  }

  if (!g_items_logged) {
    g_items_logged = true;
    logf("items: tagging %d valuable entities", g_nitems);
  }
}

// Authoritative local health/armor for the "only if usable" item filter.
// The health ceiling comes from the server player's m_iMaxHealth, not a
// hardcoded 100; when it cannot be read the filter fails open.
static void local_vitals(int &hp, int &maxhp, int &armor) {
  hp = maxhp = armor = -1;
  int local = engine_get_local_player();
  if (local <= 0)
    return;
  void *le = entitylist_get(local);
  if (le && g_net.health >= 0)
    hp = *(int *)((uintptr_t)le + g_net.health);
  if (g_iface.engineserver) {
    int smax = -1;
    int shp = server_entity_health(local, &smax, nullptr, nullptr);
    if (shp >= 0)
      hp = shp;
    if (smax > 0)
      maxhp = smax;
    armor = server_player_armor(local);
  }
  if (maxhp < 0 && le && g_net.maxhealth >= 0)
    maxhp = *(int *)((uintptr_t)le + g_net.maxhealth);
}

void esp_draw_items() {
  if (!g_surface || !g_iface.entitylist || g_net.origin < 0)
    return;
  if (!g_item_health && !g_item_ammo && !g_item_armor && !g_item_weapons &&
      !g_item_crates)
    return;
  int local = engine_get_local_player();
  if (local <= 0)
    return;
  if (!esp_update_screen())
    return;
  items_collect(local);

  int vit_hp = -1, vit_max = -1, vit_armor = -1;
  if (g_item_usable)
    local_vitals(vit_hp, vit_max, vit_armor);
  static bool ammo_logged = false;
  if (g_item_usable && !ammo_logged) {
    ammo_logged = true;
    char buf[512];
    int pos = 0;
    void *le = entitylist_get(local);
    for (int t = 0; t < 16 && pos < 500; t++) {
      int a = local_ammo(le, t);
      int m = ammo_max(t);
      if (a >= 0 && m > 0)
        pos += snprintf(buf + pos, sizeof(buf) - pos, " %d:%d/%d", t, a, m);
    }
    logf("items: ammo%s", buf);
  }

  for (int i = 0; i < g_nitems; i++) {
    ItemTarget &t = g_item_targets[i];
    // Follow the entity between the 10 Hz discovery scans.
    Vector live;
    if (entity_origin(entitylist_get(t.idx), live))
      t.origin = live;
    if (!item_kind_enabled(t.kind))
      continue;
    // Dispensers (chargers, ammo crates, supply crates) stay useful after a
    // refill, so the fullness filter does not apply to them.
    bool dispenser = strcasestr(t.label, "crate") ||
                     strcasestr(t.label, "charger");
    if (g_item_usable && !dispenser) {
      if (t.kind == IK_HEALTH && vit_hp >= 0 && vit_max > 0 &&
          vit_hp >= vit_max)
        continue;
      if (t.kind == IK_ARMOR && vit_armor >= 0 && vit_armor >= 100)
        continue;
      if (t.kind == IK_AMMO && t.ammo_type >= 0) {
        int maxa = ammo_max(t.ammo_type);
        int cura = local_ammo(entitylist_get(local), t.ammo_type);
        if (maxa > 0 && cura >= 0 && cura >= maxa)
          continue;
      }
    }
    float sx, sy;
    if (!world_to_screen(t.origin, sx, sy))
      continue;
    if (sx < -40 || sx > (float)g_scr_w + 40 || sy < -20 ||
        sy > (float)g_scr_h + 20)
      continue;

    int r = 230, g = 230, b = 230;
    switch (t.kind) {
    case IK_HEALTH: r = 90; g = 255; b = 130; break;
    case IK_AMMO: r = 255; g = 210; b = 80; break;
    case IK_ARMOR: r = 90; g = 180; b = 255; break;
    case IK_WEAPON: r = 120; g = 230; b = 255; break;
    case IK_CRATE: r = 220; g = 150; b = 255; break;
    default: break;
    }
    int x = (int)sx, y = (int)sy;
    int rad = (t.kind == IK_CRATE) ? 7 : 4;
    surf_color(r, g, b, 255);
    surf_rect(0, x - rad, y - rad, x + rad, y + rad);
    surf_line(x - rad - 4, y, x - rad - 1, y);
    surf_line(x + rad + 1, y, x + rad + 4, y);
    surf_line(x, y - rad - 4, x, y - rad - 1);
    surf_line(x, y + rad + 1, x, y + rad + 4);
    if (t.kind == IK_CRATE)
      surf_rect(1, x - 2, y - 2, x + 2, y + 2);

    float dx = t.origin.x - g_cam_eye.x;
    float dy = t.origin.y - g_cam_eye.y;
    float dz = t.origin.z - g_cam_eye.z;
    int dist = (int)sqrtf(dx * dx + dy * dy + dz * dz);
    char text[192];
    if (g_item_distance)
      snprintf(text, sizeof(text), "%s %du", t.label, dist);
    else
      snprintf(text, sizeof(text), "%s", t.label);
    int tw = (int)strlen(text) * 9;
    int tx = x + 10;
    if (tx + tw > g_scr_w - 4)
      tx = x - 10 - tw;
    if (tx < 4)
      tx = 4;
    int ty = y - 7;
    if (ty < 0)
      ty = 0;
    if (ty + 16 > g_scr_h)
      ty = g_scr_h - 16;
    draw_text_col(tx, ty, text, r, g, b);
  }
}

// ---------------------------------------------------------------------------
// projectile ESP: grenades, rockets, helicopter bombs, AR2 balls
// ---------------------------------------------------------------------------