// esp.cpp — ESP drawing + shared world_to_screen / entity gather (aimbot reuses these)
#include "hl2h.h"
#include <cmath>
#include <cstring>
#include <cstddef>
#include <cstdlib>
#include <ctime>

// ISurface slots (binary = SDK header + 4, disassembly-confirmed)
enum SurfSlot {
  SURF_DrawSetColor = 10, SURF_FilledRect = 12, SURF_OutlinedRect = 14,
  SURF_DrawLine = 15, SURF_GetScreenSize = 38,
};

enum { LIFE_ALIVE = 0 };

struct EspTarget {
  int idx;
  float sx, sy;       // screen pos of feet
  float h;            // box height px
  float health, maxhealth;
  bool show_health;
  bool friendly;
  bool neutral;
  char name[48];
};
static EspTarget g_targets[128];
static int g_ntargets = 0;
static int g_scr_w = 0, g_scr_h = 0;
static bool g_esp_logged = false;

// Speed graph: 100 samples at 0.1 s = the last 10 seconds.
static constexpr int SPEED_SAMPLES = 100;
static float g_speed_samples[SPEED_SAMPLES] = {};
static int g_speed_head = 0;
static double g_speed_last_sample = 0.0;

static double esp_now() {
  timespec ts;
  clock_gettime(CLOCK_MONOTONIC, &ts);
  return (double)ts.tv_sec + (double)ts.tv_nsec * 1e-9;
}

bool world_to_screen(const Vector &w, float &sx, float &sy) {
  // Preferred: the engine's own transform. Uses the real view setup (FOV,
  // aspect, roll), so boxes do not drift at the screen edges.
  if (g_iface.debugoverlay) {
    using Fn = int (*)(void *, const Vector *, Vector *);
    Vector s;
    int behind =
        vfunc<Fn>(g_iface.debugoverlay, 9)(g_iface.debugoverlay, &w, &s);
    if (behind)
      return false;
    sx = s.x;
    sy = s.y;
    return true;
  }
  // Fallback: local math with the default HL2 FOV.
  float pitch = g_cam_view.x * PI_F / 180.0f;
  float yaw = g_cam_view.y * PI_F / 180.0f;
  float sp = sinf(pitch), cp = cosf(pitch);
  float syy = sinf(yaw), cy = cosf(yaw);
  float fwd[3] = {cp * cy, cp * syy, -sp};
  float right[3] = {syy, -cy, 0};
  float up[3] = {sp * cy, sp * syy, cp};
  float dx = w.x - g_cam_eye.x, dy = w.y - g_cam_eye.y, dz = w.z - g_cam_eye.z;
  float z = dx * fwd[0] + dy * fwd[1] + dz * fwd[2];
  if (z < 1.0f) return false;
  float x = dx * right[0] + dy * right[1] + dz * right[2];
  float y = dx * up[0] + dy * up[1] + dz * up[2];
  float tanfov = tanf(75.0f * 0.5f * PI_F / 180.0f);
  sx = (float)g_scr_w * 0.5f + (x / z) * ((float)g_scr_w * 0.5f / tanfov);
  sy = (float)g_scr_h * 0.5f - (y / z) * ((float)g_scr_w * 0.5f / tanfov);
  return true;
}

// ---------------------------------------------------------------------------
// entity helpers (IClientEntityList / IClientNetworkable, header-documented)
// ---------------------------------------------------------------------------

using GetNetFn = void *(*)(void *, int);
using GetCCFn = void *(*)(void *);
using GetModelFn = const void *(*)(void *, int);
using GetModelNameFn = const char *(*)(void *, const void *);

// entitylist slot 0 = GetClientNetworkable(entnum). Safer than assuming the
// IClientNetworkable subobject offset inside the entity (see projectz).
static void *entity_networkable(int idx) {
  return vfunc<GetNetFn>(g_iface.entitylist, 0)(g_iface.entitylist, idx);
}

// IClientNetworkable slot 2 = GetClientClass(); ClientClass::m_pNetworkName @ +8.
static const char *entity_class_name(void *net, void **out_cc) {
  if (!net) return nullptr;
  void *cc = vfunc<GetCCFn>(net, 2)(net);
  if (out_cc) *out_cc = cc;
  return cc ? *(const char **)((uintptr_t)cc + 8) : nullptr;
}

// m_nModelIndex -> IVModelInfoClient(006)::GetModel/GetModelName.
// Itanium ABI: two dtor slots, so GetModel=2, GetModelName=4.
static const char *entity_model_name(void *ent) {
  if (!g_iface.modelinfo || g_net.modelindex < 0) return nullptr;
  int modelindex = *(int *)((uintptr_t)ent + g_net.modelindex);
  if (modelindex <= 0) return nullptr;
  const void *model =
      vfunc<GetModelFn>(g_iface.modelinfo, 2)(g_iface.modelinfo, modelindex);
  if (!model)
    return nullptr;
  return vfunc<GetModelNameFn>(g_iface.modelinfo, 4)(g_iface.modelinfo, model);
}

// HL2 SP: generic NPCs (combine, metrocop, zombie, citizen, antlion, ...) all
// use the single client class "CAI_BaseNPC" — only special NPCs register their
// own class names (CNPC_Manhack, CNPC_Strider, CNPC_CombineGunship, ...).
static bool is_npc_class(const char *name) {
  if (!name) return false;
  return strstr(name, "NPC") != nullptr ||
         strstr(name, "BaseHelicopter") != nullptr;
}

static bool model_is_friendly(const char *m) {
  static const char *patterns[] = {
      "citizen", "humans/",  "male_",   "female_", "barney", "alyx",
      "alex",    "scientist", "kleiner", "eli",     "mossman", "vortigaunt",
      "dog",     "grigori",   "monk",    "odessa",  "gman",   nullptr};
  if (!m) return false;
  for (int i = 0; patterns[i]; i++)
    if (strstr(m, patterns[i]))
      return true;
  return false;
}

// harmless wildlife that also happens to be CAI_BaseNPC
static bool model_is_neutral(const char *m) {
  static const char *patterns[] = {"crow", "gull", "pigeon", "seagull",
                                   "bird", nullptr};
  if (!m) return false;
  for (int i = 0; patterns[i]; i++)
    if (strstr(m, patterns[i]))
      return true;
  return false;
}

static void short_name(const char *model, char *out, size_t outn) {
  if (!model) { snprintf(out, outn, "NPC"); return; }
  const char *base = strrchr(model, '/');
  base = base ? base + 1 : model;
  size_t n = strcspn(base, ".");
  if (n >= outn) n = outn - 1;
  memcpy(out, base, n);
  out[n] = 0;
}

static void esp_collect(int local_idx) {
  // outer_draw() runs once per PaintTraverseEx call (several per frame); cache
  // the scan briefly so we do not walk the entity list dozens of times a frame.
  static double last_scan = 0.0;
  static double last_dbg = 0.0;
  double now = esp_now();
  if (now - last_scan < 0.01)
    return;
  last_scan = now;
  bool dbg = (now - last_dbg) >= 2.0;
  if (dbg) last_dbg = now;

  g_ntargets = 0;
  using Fn = int (*)(void *);
  int hi = vfunc<Fn>(g_iface.entitylist, 6)(g_iface.entitylist); // GetHighestEntityIndex
  if (hi < 0 || hi > 4096) hi = 4096;
  int npc_alive = 0, dbg_lines = 0;
  bool srv = resolve_server_netvars();
  static bool srv_checked = false;
  static bool srv_trusted = false;

  for (int idx = 1; idx <= hi && g_ntargets < 128; idx++) {
    if (idx == local_idx) continue;
    void *ent = entitylist_get(idx);
    if (!ent) continue;
    void *net = entity_networkable(idx);
    if (!net) continue;
    const char *cls = entity_class_name(net, nullptr);
    if (!cls) continue;

    uintptr_t e = (uintptr_t)ent;
    int cli_life = g_net.lifestate >= 0
                       ? (int)*(unsigned char *)(e + g_net.lifestate)
                       : -1;
    int cli_hp = g_net.health >= 0 ? *(int *)(e + g_net.health) : 0;
    bool npc = is_npc_class(cls);
    const char *model = entity_model_name(ent);

    // NPC health is not networked; read it from the listen-server entity.
    int hp = cli_hp, maxhp = -1, life = cli_life;
    if (npc && srv) {
      int slife = -1, smax = -1;
      void *sbase = nullptr;
      int shp = server_entity_health(idx, &smax, &slife, &sbase);
      if (!srv_checked && sbase) {
        srv_checked = true;
        int cli_mi =
            g_net.modelindex >= 0 ? *(int *)(e + g_net.modelindex) : -1;
        int srv_mi = server_model_index(sbase);
        srv_trusted = (cli_mi == srv_mi);
        logf("ESP server check: idx=%d base=%p cli_model=%d srv_model=%d "
             "hp=%d maxhp=%d life=%d trusted=%d",
             idx, sbase, cli_mi, srv_mi, shp, smax, slife, (int)srv_trusted);
        if (!srv_trusted)
          logf("ESP: server entity mismatch, ignoring server values");
      }
      if (srv_trusted) {
        if (shp >= 0) hp = shp;
        if (smax > 0) maxhp = smax;
        if (slife >= 0) life = slife;
      }
    }

    if (dbg && npc && dbg_lines < 40) {
      dbg_lines++;
      logf("ESP npc %d cls=%s life=%d(cli %d) hp=%d(cli %d) maxhp=%d model=%s",
           idx, cls, life, cli_life, hp, cli_hp, maxhp,
           model ? model : "?");
    }

    if (npc) {
      if (life != LIFE_ALIVE) continue;
      npc_alive++;
    } else {
      // players (HL2DM) are the only entities with a live networked m_iHealth
      if (!strstr(cls, "Player") || !(hp > 0)) continue;
    }

    float minz = g_net.mins >= 0 ? *(float *)(e + g_net.mins + 8) : 0.0f;
    float maxz = g_net.maxs >= 0 ? *(float *)(e + g_net.maxs + 8) : 72.0f;
    if (!(maxz > minz + 4.0f && maxz - minz < 512.0f)) {
      minz = 0.0f;
      maxz = 72.0f;
    }
    Vector origin{*(float *)(e + g_net.origin), *(float *)(e + g_net.origin + 4),
                  *(float *)(e + g_net.origin + 8)};
    Vector bottom{origin.x, origin.y, origin.z + minz};
    Vector top{origin.x, origin.y, origin.z + maxz};
    float sx, sy, tx, ty;
    if (!world_to_screen(bottom, sx, sy) || !world_to_screen(top, tx, ty))
      continue;
    float h = sy - ty;
    if (h < 3.0f || sy < 0 || ty > (float)g_scr_h) continue; // behind / offscreen
    if (sx < -(float)g_scr_w || sx > 2.0f * (float)g_scr_w) continue;

    EspTarget &t = g_targets[g_ntargets++];
    t.idx = idx;
    t.sx = sx; t.sy = sy; t.h = h;
    t.health = hp > 0 ? (float)hp : 0.0f;
    t.maxhealth = maxhp > 0 ? (float)maxhp : 100.0f;
    t.show_health = hp > 0;
    t.friendly = model_is_friendly(model);
    t.neutral = model_is_neutral(model);
    short_name(model, t.name, sizeof(t.name));
    if (npc && !model) snprintf(t.name, sizeof(t.name), "NPC");
  }

  if (dbg)
    logf("ESP scan: hi=%d npc_alive=%d targets=%d", hi, npc_alive, g_ntargets);
  if (g_ntargets && !g_esp_logged) {
    g_esp_logged = true;
    logf("ESP: first targets, %d", g_ntargets);
  }
}

static void surf_rect(int filled, int x0, int y0, int x1, int y1) {
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, filled ? SURF_FilledRect : SURF_OutlinedRect)(g_surface, x0, y0, x1, y1);
}
static void surf_color(int r, int g, int b, int a) {
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, SURF_DrawSetColor)(g_surface, r, g, b, a);
}
static void surf_line(int x0, int y0, int x1, int y1) {
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, SURF_DrawLine)(g_surface, x0, y0, x1, y1);
}

// Screen projection of the aimbot FOV cone boundary, using the engine's own
// world->screen transform so it follows the actual aspect/fov.
static QAngle engine_view_angles() {
  QAngle v{g_cam_view.x, g_cam_view.y, g_cam_view.z};
  if (g_iface.engine) {
    using Fn = void (*)(void *, QAngle *);
    vfunc<Fn>(g_iface.engine, 19)(g_iface.engine, &v);
  }
  return v;
}

static void draw_fov_circle() {
  if (!aimbot_fov_circle())
    return;
  float fov = (float)aimbot_fov();
  if (fov < 1.0f || fov >= 89.0f) // beyond this the "circle" is behind the eye
    return;
  float alpha = fov * PI_F / 180.0f;
  QAngle view = engine_view_angles();
  float yaw = view.y * PI_F / 180.0f;
  float pitch = view.x * PI_F / 180.0f;
  Vector fwd{cosf(pitch) * cosf(yaw), cosf(pitch) * sinf(yaw), -sinf(pitch)};
  Vector right{sinf(yaw), -cosf(yaw), 0.0f};
  Vector up{right.y * fwd.z - right.z * fwd.y,
            right.z * fwd.x - right.x * fwd.z,
            right.x * fwd.y - right.y * fwd.x};

  constexpr float D = 1024.0f;
  float ca = cosf(alpha), sa = sinf(alpha);
  Vector eh{g_cam_eye.x + (fwd.x * ca + right.x * sa) * D,
            g_cam_eye.y + (fwd.y * ca + right.y * sa) * D,
            g_cam_eye.z + (fwd.z * ca + right.z * sa) * D};
  Vector ev{g_cam_eye.x + (fwd.x * ca + up.x * sa) * D,
            g_cam_eye.y + (fwd.y * ca + up.y * sa) * D,
            g_cam_eye.z + (fwd.z * ca + up.z * sa) * D};
  float hsx, hsy, vsx, vsy;
  if (!world_to_screen(eh, hsx, hsy) || !world_to_screen(ev, vsx, vsy))
    return;

  float cx = (float)g_scr_w * 0.5f, cy = (float)g_scr_h * 0.5f;
  float rx = fabsf(hsx - cx), ry = fabsf(vsy - cy);
  if (!(rx > 1.0f && ry > 1.0f) || rx > 1e5f || ry > 1e5f)
    return;

  constexpr int N = 64;
  int px = 0, py = 0;
  surf_color(255, 255, 255, 160);
  for (int i = 0; i <= N; i++) {
    float phi = (2.0f * PI_F * i) / N;
    int x = (int)(cx + rx * cosf(phi));
    int y = (int)(cy + ry * sinf(phi));
    if (i > 0)
      surf_line(px, py, x, y);
    px = x;
    py = y;
  }
}

// Speed graph: 100 samples at 0.1 s = the last 10 seconds; min is 0, max is
// the window maximum. Small and centered in the lower half of the screen.
static void speed_graph_sample() {
  // Only while actually playing: IVEngineClient013 slot 26 IsInGame,
  // slot 84 IsPaused.
  if (g_iface.engine) {
    using BoolFn = bool (*)(void *);
    if (!vfunc<BoolFn>(g_iface.engine, 26)(g_iface.engine))
      return;
    if (vfunc<BoolFn>(g_iface.engine, 84)(g_iface.engine))
      return;
  }
  double now = esp_now();
  if (now - g_speed_last_sample < 0.1)
    return;
  g_speed_last_sample = now;
  float speed = 0.0f;
  int local = engine_get_local_player();
  if (local > 0 && g_net.velocity >= 0) {
    void *ent = entitylist_get(local);
    if (ent) {
      const float *v = (const float *)((uintptr_t)ent + g_net.velocity);
      speed = sqrtf(v[0] * v[0] + v[1] * v[1]);
    }
  }
  g_speed_samples[g_speed_head] = speed;
  g_speed_head = (g_speed_head + 1) % SPEED_SAMPLES;
}

static void draw_speed_graph() {
  if (!esp_option(ESP_OPT_SHOW_SPEEDGRAPH))
    return;
  speed_graph_sample();

  float maxv = 0.0f;
  for (int i = 0; i < SPEED_SAMPLES; i++)
    if (g_speed_samples[i] > maxv)
      maxv = g_speed_samples[i];
  float scale = maxv > 1.0f ? maxv : 1.0f;

  const int w = 240, h = 64;
  int x = (g_scr_w - w) / 2;
  int y = (g_scr_h * 9) / 10 - h / 2;
  if (x < 0) x = 0;
  if (y < 0) y = 0;

  surf_color(0, 0, 0, 120);
  surf_rect(1, x, y, x + w, y + h);
  surf_color(80, 80, 80, 180);
  surf_rect(0, x, y, x + w, y + h);

  surf_color(0, 255, 200, 220);
  int px = 0, py = 0;
  for (int i = 0; i < SPEED_SAMPLES; i++) {
    int idx = (g_speed_head + i) % SPEED_SAMPLES; // oldest -> newest
    float v = g_speed_samples[idx];
    int sx = x + 1 + (i * (w - 2)) / (SPEED_SAMPLES - 1);
    int sy = y + h - 2 - (int)((v / scale) * (float)(h - 4));
    if (sy < y + 1) sy = y + 1;
    if (i > 0)
      surf_line(px, py, sx, sy);
    px = sx;
    py = sy;
  }

  char label[32];
  snprintf(label, sizeof(label), "max %d", (int)maxv);
  draw_text_col(x + 3, y + 2, label, 200, 200, 200);

  int cur_idx = (g_speed_head + SPEED_SAMPLES - 1) % SPEED_SAMPLES;
  char cur[16];
  snprintf(cur, sizeof(cur), "%d", (int)g_speed_samples[cur_idx]);
  int cur_w = (int)strlen(cur) * 8;
  draw_text_col(x + w - 4 - cur_w, y + 2, cur, 255, 255, 255);
}

// Draw the parent->child bone links. Bone snapshots are world-space matrices
// from SetupBones; project each bone once and reuse for both endpoints.
static void draw_skeleton(const EspTarget &t) {
  int n = bones_count(t.idx);
  if (n <= 0 || n > 256)
    return;
  Vector wp[256];
  float xs[256], ys[256];
  bool ok[256];
  int core_count = 0;
  for (int i = 0; i < n; i++) {
    ok[i] = false;
    if (!bone_is_skeleton_core(t.idx, i))
      continue;
    core_count++;
    ok[i] = bone_pos(t.idx, i, wp[i]) &&
            world_to_screen(wp[i], xs[i], ys[i]) && std::isfinite(xs[i]) &&
            std::isfinite(ys[i]);
  }
  static int logged = 0;
  if (core_count > 0 && logged < 4) {
    logged++;
    logf("skeleton: idx=%d bones=%d core=%d humanoid=%d", t.idx, n, core_count,
         (int)bones_is_humanoid(t.idx));
  }
  if (t.friendly)
    surf_color(60, 255, 60, 255);
  else if (t.neutral)
    surf_color(220, 220, 220, 255);
  else
    surf_color(255, 60, 60, 255);
  for (int i = 0; i < n; i++) {
    if (!ok[i])
      continue;
    int p = bone_nearest_core_parent(t.idx, i);
    if (p >= 0 && p < n && ok[p])
      surf_line((int)xs[p], (int)ys[p], (int)xs[i], (int)ys[i]);
  }
}

// ---------------------------------------------------------------------------
// aimbot v1: nearest hostile NPC head to the crosshair.
// Bounded smoothing: never snap, never overshoot. Each tick moves at most
// MAX_STEP degrees toward the target and stops inside DEADZONE.
// ---------------------------------------------------------------------------

static QAngle angle_to(const Vector &from, const Vector &to) {
  float dx = to.x - from.x, dy = to.y - from.y, dz = to.z - from.z;
  float horiz = sqrtf(dx * dx + dy * dy);
  if (horiz < 0.001f)
    horiz = 0.001f;
  QAngle a{};
  a.x = -atan2f(dz, horiz) * 180.0f / PI_F; // Source: positive pitch = down
  a.y = atan2f(dy, dx) * 180.0f / PI_F;
  a.z = 0.0f;
  return a;
}

static int g_aim_lock = -1;
static int g_silent_lock = -1;

void aimbot_reset_lock() { g_aim_lock = -1; }
void silentaim_reset_lock() { g_silent_lock = -1; }

// max_fov is the angular radius around the crosshair. If lock_idx is non-null
// and valid, that target is kept while it is alive and visible (the "do not
// switch while the bind is held" rule); a fresh acquisition is ranked by angle
// and the nearest visible selected hitbox point.
static bool select_aim_target(const QAngle &view, unsigned bone_mask,
                              bool vischeck, float max_fov, const char *tag,
                              int *lock_idx, int &out_idx, Vector &out_point,
                              float &out_fov) {
  out_idx = -1;
  out_point = {};
  out_fov = 0.0f;
  if (!g_iface.entitylist || g_net.origin < 0 || g_net.maxs < 0)
    return false;
  int local = engine_get_local_player();
  if (local <= 0)
    return false;
  void *local_ent = entitylist_get(local);
  if (!local_ent)
    return false;
  if (g_net.health >= 0 &&
      *(int *)((uintptr_t)local_ent + g_net.health) <= 0)
    return false;

  auto try_target = [&](int idx, bool enforce_fov, Vector &pt,
                        float &fov) -> bool {
    if (idx <= 0 || idx == local)
      return false;
    void *ent = entitylist_get(idx);
    if (!ent)
      return false;
    void *net = entity_networkable(idx);
    if (!net)
      return false;
    const char *cls = entity_class_name(net, nullptr);
    if (!cls || !is_npc_class(cls))
      return false;
    uintptr_t e = (uintptr_t)ent;
    int life = g_net.lifestate >= 0
                   ? (int)*(unsigned char *)(e + g_net.lifestate)
                   : -1;
    if (life != LIFE_ALIVE)
      return false;
    const char *model = entity_model_name(ent);
    if (model_is_friendly(model) || model_is_neutral(model))
      return false;
    if (!bones_update(idx, ent))
      return false;
    Vector pts[32];
    int npoints = aim_points(idx, bone_mask, pts, 32);
    float best = 1e9f;
    Vector best_pt{};
    for (int i = 0; i < npoints; i++) {
      float f = getfov(view, angle_to(g_cam_eye, pts[i]));
      if (enforce_fov && f > max_fov)
        continue;
      if (f >= best)
        continue;
      if (vischeck && !is_visible(g_cam_eye, pts[i]))
        continue;
      best = f;
      best_pt = pts[i];
    }
    if (best > 1e8f)
      return false;
    pt = best_pt;
    fov = best;
    return true;
  };

  // Keep the locked target while it is alive and has a visible selected point.
  // No FOV limit on a locked target; only acquisition is FOV-limited.
  if (lock_idx && *lock_idx >= 0) {
    Vector pt;
    float f;
    if (try_target(*lock_idx, false, pt, f)) {
      out_idx = *lock_idx;
      out_point = pt;
      out_fov = f;
      static int lock_logs = 0;
      if (lock_logs < 5) {
        lock_logs++;
        logf("%s: lock idx=%d fov=%.2f", tag, out_idx, f);
      }
      return true;
    }
    *lock_idx = -1;
  }

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

  struct Candidate {
    int idx;
    float fov;
    Vector approx;
  };
  Candidate cands[16];
  int ncands = 0;

  for (int idx = 1; idx <= hi; idx++) {
    if (idx == local)
      continue;
    void *ent = entitylist_get(idx);
    if (!ent)
      continue;
    void *net = entity_networkable(idx);
    if (!net)
      continue;
    const char *cls = entity_class_name(net, nullptr);
    if (!cls || !is_npc_class(cls))
      continue;

    uintptr_t e = (uintptr_t)ent;
    int life = g_net.lifestate >= 0
                   ? (int)*(unsigned char *)(e + g_net.lifestate)
                   : -1;
    if (life != LIFE_ALIVE)
      continue;
    const char *model = entity_model_name(ent);
    if (model_is_friendly(model) || model_is_neutral(model))
      continue;

    float maxz = g_net.maxs >= 0 ? *(float *)(e + g_net.maxs + 8) : 72.0f;
    if (!(maxz > 4.0f && maxz < 512.0f))
      maxz = 72.0f;
    Vector origin{*(float *)(e + g_net.origin),
                  *(float *)(e + g_net.origin + 4),
                  *(float *)(e + g_net.origin + 8)};
    Vector approx{origin.x, origin.y,
                  origin.z + maxz * ((bone_mask & (1u << 1)) ? 0.9f : 0.55f)};
    float fov = getfov(view, angle_to(g_cam_eye, approx));
    if (fov > max_fov)
      continue;

    int pos = ncands;
    while (pos > 0 && cands[pos - 1].fov > fov)
      pos--;
    if (ncands < 16)
      ncands++;
    for (int j = ncands - 1; j > pos; j--)
      cands[j] = cands[j - 1];
    if (pos < 16)
      cands[pos] = {idx, fov, approx};
  }

  if (ncands == 0) {
    static double last_none = 0.0;
    double now = esp_now();
    if (now - last_none >= 2.0) {
      last_none = now;
      logf("%s: no hostile target within %.0f deg", tag, max_fov);
    }
    return false;
  }

  for (int ci = 0; ci < ncands; ci++) {
    Vector pt;
    float f;
    if (!try_target(cands[ci].idx, true, pt, f))
      continue;
    out_idx = cands[ci].idx;
    out_point = pt;
    out_fov = f;
    if (lock_idx)
      *lock_idx = out_idx;
    static int sel_logs = 0;
    if (sel_logs < 5) {
      sel_logs++;
      logf("%s: target idx=%d fov=%.2f vischeck=%d", tag, out_idx, f,
           (int)vischeck);
    }
    return true;
  }

  static double last_vis = 0.0;
  double now = esp_now();
  if (now - last_vis >= 2.0) {
    last_vis = now;
    logf("%s: no visible aim point (vischeck=%d)", tag, (int)vischeck);
  }
  return false;
}

bool aimbot_apply(CUserCmd *cmd) {
  unsigned bone_mask = aimbot_bone_mask();
  if (!bone_mask)
    return false;
  QAngle view{cmd->viewangles[0], cmd->viewangles[1], 0.0f};
  int target = -1;
  Vector point{};
  float fov = 0.0f;
  float max_fov = (float)aimbot_fov();
  if (max_fov < 1.0f) max_fov = 1.0f;
  if (max_fov > 180.0f) max_fov = 180.0f;
  int *lock = feature_has_bind(FEAT_AIMBOT) ? &g_aim_lock : nullptr;
  if (!select_aim_target(view, bone_mask, aimbot_vischeck_enabled(), max_fov,
                         "aimbot", lock, target, point, fov))
    return false;
  QAngle desired = angle_to(g_cam_eye, point);
  static int want_logs = 0;
  if (want_logs < 10) {
    want_logs++;
    logf("aimbot: target=%d aim=(%.1f %.1f %.1f) fov=%.2f want=%.2f/%.2f",
         target, point.x, point.y, point.z, fov, desired.x, desired.y);
  }
  float dp = desired.x - cmd->viewangles[0];
  float dy = desired.y - cmd->viewangles[1];
  while (dy > 180.0f) dy -= 360.0f;
  while (dy < -180.0f) dy += 360.0f;

  constexpr float DEADZONE = 0.05f;
  float max_step = (float)aimbot_smooth_step();
  if (max_step < 1.0f) max_step = 1.0f;
  float maxd = fmaxf(fabsf(dp), fabsf(dy));
  if (maxd <= DEADZONE)
    return false;

  float scale = (maxd > max_step) ? (max_step / maxd) : 1.0f;
  float old_pitch = cmd->viewangles[0];
  float old_yaw = cmd->viewangles[1];
  float np = cmd->viewangles[0] + dp * scale;
  float ny = cmd->viewangles[1] + dy * scale;
  if (np > 89.0f) np = 89.0f;
  if (np < -89.0f) np = -89.0f;
  while (ny > 180.0f) ny -= 360.0f;
  while (ny < -180.0f) ny += 360.0f;
  cmd->viewangles[0] = np;
  cmd->viewangles[1] = ny;

  if (g_iface.engine) {
    QAngle out{np, ny, 0.0f};
    using SetViewFn = void (*)(void *, QAngle *);
    vfunc<SetViewFn>(g_iface.engine, 20)(g_iface.engine, &out);
  }
  static int mod_logs = 0;
  if (mod_logs < 10) {
    mod_logs++;
    logf("aimbot: view %.2f/%.2f -> %.2f/%.2f", old_pitch, old_yaw, np, ny);
  }
  return true;
}

// Keep the world-space movement wish direction unchanged when the usercmd
// view angles are temporarily replaced by the silent-aim angles.
static void preserve_movement(CUserCmd *cmd, float old_yaw, float new_yaw) {
  float oy = old_yaw * PI_F / 180.0f;
  float ay = new_yaw * PI_F / 180.0f;
  float ofx = cosf(oy), ofy = sinf(oy);
  float orx = sinf(oy), ory = -cosf(oy);
  float afx = cosf(ay), afy = sinf(ay);
  float arx = sinf(ay), ary = -cosf(ay);
  float wx = ofx * cmd->forwardmove + orx * cmd->sidemove;
  float wy = ofy * cmd->forwardmove + ory * cmd->sidemove;
  cmd->forwardmove = wx * afx + wy * afy;
  cmd->sidemove = wx * arx + wy * ary;
}

bool silent_aim_apply(CUserCmd *cmd) {
  unsigned bone_mask = aimbot_bone_mask();
  if (!bone_mask)
    return false;
  QAngle orig{g_cam_view.x, g_cam_view.y, g_cam_view.z};
  QAngle view{orig.x, orig.y, 0.0f};
  int target = -1;
  Vector point{};
  float fov = 0.0f;
  float max_fov = (float)silentaim_fov();
  if (max_fov < 1.0f) max_fov = 1.0f;
  if (max_fov > 180.0f) max_fov = 180.0f;
  int *lock = feature_has_bind(FEAT_SILENTAIM) ? &g_silent_lock : nullptr;
  if (!select_aim_target(view, bone_mask, true, max_fov, "silentaim", lock,
                         target, point, fov))
    return false;
  QAngle desired = angle_to(g_cam_eye, point);
  float np = desired.x;
  if (np > 89.0f) np = 89.0f;
  if (np < -89.0f) np = -89.0f;
  float ny = desired.y;
  while (ny > 180.0f) ny -= 360.0f;
  while (ny < -180.0f) ny += 360.0f;

  preserve_movement(cmd, orig.y, ny);

  cmd->viewangles[0] = np;
  cmd->viewangles[1] = ny;
  cmd->viewangles[2] = orig.z;

  // Restore now and again at FRAME_RENDER_START (after the engine consumed
  // the aimed usercmd); the frame-stage restore is the one that sticks.
  set_silent_restore(orig);
  if (g_iface.engine) {
    QAngle restore{orig.x, orig.y, orig.z};
    using SetViewFn = void (*)(void *, QAngle *);
    vfunc<SetViewFn>(g_iface.engine, 20)(g_iface.engine, &restore);
  }
  cmd->buttons |= IN_ATTACK;
  static int logs = 0;
  if (logs < 5) {
    logs++;
    logf("silentaim: fire idx=%d fov=%.2f aim=%.2f/%.2f", target, fov, np, ny);
  }
  return true;
}

// ---------------------------------------------------------------------------
// melee killbot
// ---------------------------------------------------------------------------
//
// The crowbar's CBaseHLBludgeonWeapon::Swing traces 75 units from
// Weapon_ShootPosition along the view forward (CROWBAR_RANGE in
// weapon_crowbar.h). It first tries a line, then a +/-16 hull backed off by
// ~28 units, and ignores targets more than ~45 degrees off the aim direction.
// We therefore only need to point the usercmd at the target for one command;
// the rendered view is restored exactly like silent aim.

static constexpr float MELEE_RANGE = 75.0f;

static float vec_dist(const Vector &a, const Vector &b) {
  float dx = a.x - b.x, dy = a.y - b.y, dz = a.z - b.z;
  return sqrtf(dx * dx + dy * dy + dz * dz);
}

bool melee_weapon_active(void *local_ent) {
  if (!local_ent)
    return false;
  int local = engine_get_local_player();

  auto check = [&](int idx, const char **cls_out,
                   const char **model_out) -> bool {
    if (idx <= 0 || idx > 4096)
      return false;
    void *wep = entitylist_get(idx);
    void *net = entity_networkable(idx);
    const char *cls = net ? entity_class_name(net, nullptr) : nullptr;
    const char *model = wep ? entity_model_name(wep) : nullptr;
    *cls_out = cls;
    *model_out = model;
    return (cls && strstr(cls, "Crowbar")) ||
           (model && strstr(model, "crowbar"));
  };

  int idx = -1;
  if (g_net.activeweapon >= 0) {
    uint32_t h = *(uint32_t *)((uintptr_t)local_ent + g_net.activeweapon);
    if (h != 0xFFFFFFFFu)
      idx = (int)(h & 0xFFFF);
  }
  const char *cls = nullptr, *model = nullptr;
  bool crowbar = check(idx, &cls, &model);

  if (!crowbar) {
    // Fallback: the authoritative server player's m_hActiveWeapon handle.
    // Also covers a client netvar offset that resolves but does not point at
    // the weapon the server is actually using.
    if (local > 0) {
      resolve_server_netvars();
      int si = server_active_weapon(local);
      if (si > 0 && si != idx) {
        idx = si;
        crowbar = check(idx, &cls, &model);
      }
    }
  }

  static int last_idx = -2;
  static bool last_crowbar = false;
  if (idx != last_idx || crowbar != last_crowbar) {
    last_idx = idx;
    last_crowbar = crowbar;
    logf("melee: active idx=%d cls=%s model=%s crowbar=%d", idx,
         cls ? cls : "?", model ? model : "?", (int)crowbar);
  }
  return crowbar;
}

bool melee_aimbot_apply(CUserCmd *cmd) {
  if (!g_iface.entitylist || g_net.origin < 0)
    return false;
  int local = engine_get_local_player();
  if (local <= 0)
    return false;
  void *local_ent = entitylist_get(local);
  if (!local_ent)
    return false;
  if (g_net.health >= 0 &&
      *(int *)((uintptr_t)local_ent + g_net.health) <= 0)
    return false;

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

  struct Cand {
    int idx;
    float dist;
    Vector closest;
    Vector center;
  };
  Cand cands[16];
  int n = 0;

  for (int idx = 1; idx <= hi; idx++) {
    if (idx == local)
      continue;
    void *ent = entitylist_get(idx);
    if (!ent)
      continue;
    void *net = entity_networkable(idx);
    if (!net)
      continue;
    const char *cls = entity_class_name(net, nullptr);
    if (!cls || !is_npc_class(cls))
      continue;
    uintptr_t e = (uintptr_t)ent;
    int life = g_net.lifestate >= 0
                   ? (int)*(unsigned char *)(e + g_net.lifestate)
                   : -1;
    if (life != LIFE_ALIVE)
      continue;
    const char *model = entity_model_name(ent);
    if (model_is_friendly(model) || model_is_neutral(model))
      continue;

    Vector origin{*(float *)(e + g_net.origin),
                  *(float *)(e + g_net.origin + 4),
                  *(float *)(e + g_net.origin + 8)};
    float minx = -16.0f, miny = -16.0f, minz = 0.0f;
    float maxx = 16.0f, maxy = 16.0f, maxz = 72.0f;
    if (g_net.mins >= 0) {
      minx = *(float *)(e + g_net.mins);
      miny = *(float *)(e + g_net.mins + 4);
      minz = *(float *)(e + g_net.mins + 8);
    }
    if (g_net.maxs >= 0) {
      maxx = *(float *)(e + g_net.maxs);
      maxy = *(float *)(e + g_net.maxs + 4);
      maxz = *(float *)(e + g_net.maxs + 8);
    }
    if (!(maxz > minz + 4.0f && maxz < 512.0f)) {
      minz = 0.0f;
      maxz = 72.0f;
    }
    if (!(maxx > minx + 1.0f && maxx < 256.0f)) {
      minx = -16.0f;
      maxx = 16.0f;
    }
    if (!(maxy > miny + 1.0f && maxy < 256.0f)) {
      miny = -16.0f;
      maxy = 16.0f;
    }

    Vector lo{origin.x + minx, origin.y + miny, origin.z + minz};
    Vector hiV{origin.x + maxx, origin.y + maxy, origin.z + maxz};
    Vector closest{g_cam_eye.x, g_cam_eye.y, g_cam_eye.z};
    if (closest.x < lo.x) closest.x = lo.x;
    if (closest.x > hiV.x) closest.x = hiV.x;
    if (closest.y < lo.y) closest.y = lo.y;
    if (closest.y > hiV.y) closest.y = hiV.y;
    if (closest.z < lo.z) closest.z = lo.z;
    if (closest.z > hiV.z) closest.z = hiV.z;
    float d = vec_dist(g_cam_eye, closest);
    if (d > MELEE_RANGE)
      continue;

    Vector center{(lo.x + hiV.x) * 0.5f, (lo.y + hiV.y) * 0.5f,
                  (lo.z + hiV.z) * 0.5f};

    int pos = n;
    while (pos > 0 && cands[pos - 1].dist > d)
      pos--;
    if (n < 16)
      n++;
    else if (pos >= 16)
      continue;
    for (int j = n - 1; j > pos; j--)
      cands[j] = cands[j - 1];
    cands[pos] = {idx, d, closest, center};
  }

  for (int ci = 0; ci < n; ci++) {
    const Cand &c = cands[ci];
    Vector aim{};
    bool have_aim = false;

    // Prefer the nearest visible hitbox center. This handles small NPCs
    // (headcrabs, antlions) whose AABB center can be less useful than the
    // actual body hitboxes.
    void *tent = entitylist_get(c.idx);
    if (tent && bones_update(c.idx, tent)) {
      Vector pts[32];
      int np = aim_points(c.idx, 0xFE, pts, 32);
      float bestd = 1e9f;
      for (int i = 0; i < np; i++) {
        float pd = vec_dist(g_cam_eye, pts[i]);
        if (pd > MELEE_RANGE || pd >= bestd)
          continue;
        if (!is_visible(g_cam_eye, pts[i]))
          continue;
        bestd = pd;
        aim = pts[i];
        have_aim = true;
      }
    }

    if (!have_aim) {
      aim = c.center;
      float ad = vec_dist(g_cam_eye, aim);
      if (ad > MELEE_RANGE) {
        // The body is in range but its center is not: aim just inside the
        // closest point on the AABB.
        aim = c.closest;
        aim.x += (c.center.x - c.closest.x) * 0.25f;
        aim.y += (c.center.y - c.closest.y) * 0.25f;
        aim.z += (c.center.z - c.closest.z) * 0.25f;
        ad = vec_dist(g_cam_eye, aim);
        if (ad > MELEE_RANGE)
          aim = c.closest;
      }
      if (!is_visible(g_cam_eye, aim))
        continue;
    }

    QAngle orig{g_cam_view.x, g_cam_view.y, g_cam_view.z};
    QAngle desired = angle_to(g_cam_eye, aim);
    float np = desired.x;
    if (np > 89.0f) np = 89.0f;
    if (np < -89.0f) np = -89.0f;
    float ny = desired.y;
    while (ny > 180.0f) ny -= 360.0f;
    while (ny < -180.0f) ny += 360.0f;

    preserve_movement(cmd, orig.y, ny);
    cmd->viewangles[0] = np;
    cmd->viewangles[1] = ny;
    cmd->viewangles[2] = orig.z;
    set_silent_restore(orig);
    if (g_iface.engine) {
      QAngle restore{orig.x, orig.y, orig.z};
      using SetViewFn = void (*)(void *, QAngle *);
      vfunc<SetViewFn>(g_iface.engine, 20)(g_iface.engine, &restore);
    }
    cmd->buttons |= IN_ATTACK;

    static int logs = 0;
    if (logs < 10) {
      logs++;
      logf("melee: swing idx=%d dist=%.1f aim=(%.1f %.1f %.1f)", c.idx,
           c.dist, aim.x, aim.y, aim.z);
    }
    return true;
  }

  static double last_none = 0.0;
  double now = esp_now();
  if (now - last_none >= 2.0) {
    last_none = now;
    logf("melee: no visible target within %.0f", MELEE_RANGE);
  }
  return false;
}

// ---------------------------------------------------------------------------
// weapon spread control
// ---------------------------------------------------------------------------
//
// HL2's CBaseEntity::FireBullets uses CBaseEntity::GetPredictionRandomSeed()
// (the client usercmd's random_seed) unless a weapon opts into
// m_bUseServerRandomSeed. HL2 weapons do not, so the client can choose the
// 8-bit seed and with it the random cone offset. CShotManipulator::ApplySpread
// draws four uniform floats per attempt; we precompute the best seed for one
// shot and for the shotgun's pellet windows with the engine's own RNG.

static bool g_spread_ready = false;
static int g_spread_seed1 = 0;
static int g_spread_seed8 = 0;  // first pellet exact, 7 spread
static int g_spread_seed12 = 0; // all 12 spread
int g_spread_pellets = 1;

static void spread_compute() {
  using SeedFn = void (*)(int);
  using FloatFn = float (*)(float, float);
  SeedFn seed = (SeedFn)dlsym(RTLD_DEFAULT, "RandomSeed");
  FloatFn rf = (FloatFn)dlsym(RTLD_DEFAULT, "RandomFloat");
  if (!seed || !rf) {
    size_t slash = g_engine.path.find_last_of('/');
    if (slash != std::string::npos) {
      std::string path = g_engine.path.substr(0, slash + 1) + "libvstdlib.so";
      void *h = dlopen(path.c_str(), RTLD_NOLOAD | RTLD_LAZY | RTLD_GLOBAL);
      if (!h)
        h = dlopen(path.c_str(), RTLD_LAZY | RTLD_GLOBAL);
      if (h) {
        seed = (SeedFn)dlsym(h, "RandomSeed");
        rf = (FloatFn)dlsym(h, "RandomFloat");
      }
    }
  }
  if (!seed || !rf) {
    logf("spread: RandomSeed/RandomFloat unavailable");
    return;
  }

  auto draw = [&](int s, float &x, float &y) {
    seed(s);
    int it = 0;
    do {
      // CShotManipulator::ApplySpread with the default bias of 1.0:
      // shotBias = 1.0, flatness = 0.5.
      x = rf(-1.0f, 1.0f) * 0.5f + rf(-1.0f, 1.0f) * 0.5f;
      y = rf(-1.0f, 1.0f) * 0.5f + rf(-1.0f, 1.0f) * 0.5f;
      it++;
    } while (x * x + y * y > 1.0f && it < 64);
  };

  float best1 = 1e9f;
  for (int s = 0; s < 256; s++) {
    float x, y;
    draw(s, x, y);
    float r2 = x * x + y * y;
    if (r2 < best1) {
      best1 = r2;
      g_spread_seed1 = s;
    }
  }

  auto window = [&](int n, int first) {
    int best_s = 0;
    float best = 1e9f;
    for (int s = 0; s < 256; s++) {
      float score = 0.0f;
      for (int i = first; i < n; i++) {
        float x, y;
        draw(s + i, x, y);
        score += x * x + y * y;
      }
      if (score < best) {
        best = score;
        best_s = s;
      }
    }
    return best_s;
  };
  g_spread_seed8 = window(8, 1);
  g_spread_seed12 = window(12, 0);
  seed(0);

  logf("spread: seeds single=%d shotgun8=%d shotgun12=%d", g_spread_seed1,
       g_spread_seed8, g_spread_seed12);
  g_spread_ready = true;
}

static bool active_weapon_is_shotgun(void *local_ent) {
  if (!local_ent || g_net.activeweapon < 0)
    return false;
  uint32_t h = *(uint32_t *)((uintptr_t)local_ent + g_net.activeweapon);
  if (h == 0xFFFFFFFFu)
    return false;
  int idx = (int)(h & 0xFFFF);
  if (idx <= 0 || idx > 4096)
    return false;
  void *wep = entitylist_get(idx);
  void *net = entity_networkable(idx);
  const char *cls = net ? entity_class_name(net, nullptr) : nullptr;
  const char *model = wep ? entity_model_name(wep) : nullptr;
  return (cls && strstr(cls, "Shotgun")) ||
         (model && strstr(model, "shotgun"));
}

bool spread_control_apply(CUserCmd *cmd, void *local_ent) {
  if (!feature_active(FEAT_SPREAD) || !spread_no_spread_enabled())
    return false;
  if (!(cmd->buttons & (IN_ATTACK | IN_ATTACK2)))
    return false;
  if (!g_spread_ready) {
    static bool tried = false;
    if (!tried) {
      tried = true;
      spread_compute();
    }
  }
  if (!g_spread_ready)
    return false;

  bool shotgun = active_weapon_is_shotgun(local_ent);
  int pellets = 1;
  if (shotgun)
    pellets = (cmd->buttons & IN_ATTACK2) ? 12 : 8;
  g_spread_pellets = pellets;
  int seed = spread_best_seed(pellets);
  if (cmd->random_seed == seed)
    return false;
  cmd->random_seed = seed;

  static int logs = 0;
  if (logs < 10) {
    logs++;
    logf("spread: seed=%d pellets=%d", seed, pellets);
  }
  return true;
}

int spread_best_seed(int pellets) {
  if (!g_spread_ready)
    return 33;
  if (pellets >= 12)
    return g_spread_seed12;
  if (pellets >= 8)
    return g_spread_seed8;
  return g_spread_seed1;
}

bool triggerbot_apply(CUserCmd *cmd) {
  if (!g_iface.enginetrace || !g_iface.entitylist)
    return false;
  int local = engine_get_local_player();
  if (local <= 0)
    return false;
  void *local_ent = entitylist_get(local);
  if (!local_ent)
    return false;
  if (g_net.health >= 0 &&
      *(int *)((uintptr_t)local_ent + g_net.health) <= 0)
    return false;

  QAngle view{cmd->viewangles[0], cmd->viewangles[1], 0.0f};
  Vector fwd = angle_forward_vector(view);
  Vector start = g_cam_eye;
  Vector end{start.x + fwd.x * 8192.0f, start.y + fwd.y * 8192.0f,
             start.z + fwd.z * 8192.0f};
  void *hit = trace_entity(start, end, local_ent);
  if (!hit)
    return false;

  using Fn = int (*)(void *);
  int hi = vfunc<Fn>(g_iface.entitylist, 6)(g_iface.entitylist);
  if (hi < 0 || hi > 4096)
    hi = 4096;
  for (int idx = 1; idx <= hi; idx++) {
    if (entitylist_get(idx) != hit)
      continue;
    void *net = entity_networkable(idx);
    const char *cls = net ? entity_class_name(net, nullptr) : nullptr;
    if (!cls || !is_npc_class(cls))
      return false;
    uintptr_t e = (uintptr_t)hit;
    int life = g_net.lifestate >= 0
                   ? (int)*(unsigned char *)(e + g_net.lifestate)
                   : -1;
    if (life != LIFE_ALIVE)
      return false;
    const char *model = entity_model_name(hit);
    if (model_is_friendly(model) || model_is_neutral(model))
      return false;
    cmd->buttons |= IN_ATTACK;
    static int logs = 0;
    if (logs < 5) {
      logs++;
      logf("triggerbot: fire idx=%d model=%s", idx, model ? model : "?");
    }
    return true;
  }
  return false;
}

void esp_draw() {
  if (!g_surface || !g_iface.entitylist || !g_net.esp_ok()) return;
  if (!g_scr_w) {
    using Fn = void (*)(void *, int &, int &);
    vfunc<Fn>(g_surface, SURF_GetScreenSize)(g_surface, g_scr_w, g_scr_h);
    logf("ESP: screen %dx%d", g_scr_w, g_scr_h);
    if (!g_scr_w) return;
  }
  draw_fov_circle();
  esp_collect(engine_get_local_player());
  for (int i = 0; i < g_ntargets; i++) {
    const EspTarget &t = g_targets[i];
    if (t.neutral && !esp_option(ESP_OPT_SHOW_NEUTRAL))
      continue;
    if (esp_option(ESP_OPT_SHOW_SKELETON)) {
      void *ent = entitylist_get(t.idx);
      if (ent && bones_update(t.idx, ent))
        draw_skeleton(t);
    }
    if (t.friendly) surf_color(60, 255, 60, 255);
    else if (t.neutral) surf_color(220, 220, 220, 255);
    else surf_color(255, 60, 60, 255);
    float w = t.h * 0.45f;  // ponytail: constant aspect, no OBB width
    int left = (int)(t.sx - w / 2);
    int right = (int)(t.sx + w / 2);
    int top = (int)(t.sy - t.h);
    int bot = (int)t.sy;
    if (esp_option(ESP_OPT_SHOW_BOX))
      surf_rect(0, left, top, right, bot);
    bool draw_bar = t.show_health && esp_option(ESP_OPT_SHOW_HEALTHBAR);
    bool draw_num = t.show_health && esp_option(ESP_OPT_SHOW_HEALTHNUM);
    int num_x = right + 3;
    if (draw_bar) {
      float frac = t.health / (t.maxhealth > 1.0f ? t.maxhealth : 100.0f);
      if (frac > 1) frac = 1;
      if (frac < 0) frac = 0;
      // vertical bar just right of the box, HP number beside it
      int bx0 = right + 2, bx1 = right + 5;
      surf_color(0, 0, 0, 200);
      surf_rect(1, bx0, top, bx1, bot);
      int fill_top = bot - (int)((float)(bot - top) * frac);
      if (fill_top < top) fill_top = top;
      if (frac > 0.5f) surf_color(40, 255, 40, 255);
      else if (frac > 0.25f) surf_color(255, 255, 0, 255);
      else surf_color(255, 40, 40, 255);
      if (fill_top < bot)
        surf_rect(1, bx0, fill_top, bx1, bot);
      num_x = bx1 + 3;
    }
    if (draw_num) {
      char hptext[16];
      snprintf(hptext, sizeof(hptext), "%d", (int)t.health);
      draw_text_col(num_x, top, hptext, 255, 255, 255);
    }
    if (esp_option(ESP_OPT_SHOW_NAME))
      draw_text_col(left, top - 14, t.name, 255, 255, 255);
  }

  // Groundwork probe: HL2H_BONE_DEBUG=1 draws a white marker at each NPC's
  // "head" hitbox center (from SetupBones + studio hitboxes).
  static bool bone_debug = getenv("HL2H_BONE_DEBUG") != nullptr;
  if (bone_debug) {
    static bool head_logged = false;
    for (int i = 0; i < g_ntargets; i++) {
      const EspTarget &t = g_targets[i];
      void *ent = entitylist_get(t.idx);
      if (!ent || !bones_update(t.idx, ent))
        continue;
      Vector head;
      if (!head_position(t.idx, head)) {
        static int no_head = 0;
        if (no_head < 4) {
          no_head++;
          logf("head: idx=%d no head hitbox/bone", t.idx);
        }
        continue;
      }
      float hx, hy;
      if (!world_to_screen(head, hx, hy))
        continue;
      surf_color(255, 255, 255, 255);
      surf_rect(1, (int)hx - 2, (int)hy - 2, (int)hx + 3, (int)hy + 3);
      if (!head_logged) {
        head_logged = true;
        logf("bone debug: idx=%d bones=%d head=(%.1f %.1f %.1f)", t.idx,
             bones_count(t.idx), head.x, head.y, head.z);
      }
    }
  }

  draw_speed_graph();
}