// overlay.cpp — the single ISurface access layer.
#include "hl2h.h"
#include <ctime>

ISurface *g_surface = nullptr;

// ---------------------------------------------------------------------------
// per-frame draw budget
// ---------------------------------------------------------------------------

static bool g_drawn_this_frame = false;
static double g_frame_mark_at = 0.0;

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

void overlay_frame_mark() {
  g_drawn_this_frame = false;
  g_frame_mark_at = overlay_now();
}

bool overlay_should_draw() {
  if (g_drawn_this_frame && overlay_now() - g_frame_mark_at < 0.10)
    return false;
  g_drawn_this_frame = true;
  return true;
}

void overlay_color(int r, int g, int b, int a) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, SURF_DrawSetColor)(g_surface, r, g, b, a);
}

void overlay_fill(int x0, int y0, int x1, int y1) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, SURF_DrawFilledRect)(g_surface, x0, y0, x1, y1);
}

void overlay_outline_rect(int x0, int y0, int x1, int y1) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, SURF_DrawOutlinedRect)(g_surface, x0, y0, x1, y1);
}

void overlay_line(int x0, int y0, int x1, int y1) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, SURF_DrawLine)(g_surface, x0, y0, x1, y1);
}

void overlay_text_font(HFont f) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, HFont);
  vfunc<Fn>(g_surface, SURF_DrawSetTextFont)(g_surface, f);
}

void overlay_text_color(int r, int g, int b, int a) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int, int, int, int);
  vfunc<Fn>(g_surface, SURF_DrawSetTextColor)(g_surface, r, g, b, a);
}

void overlay_text_pos(int x, int y) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int, int);
  vfunc<Fn>(g_surface, SURF_DrawSetTextPos)(g_surface, x, y);
}

void overlay_print_text(const wchar_t *text, int count, int draw_type) {
  if (!g_surface || !text || count <= 0)
    return;
  using Fn = void (*)(void *, const wchar_t *, int, int);
  vfunc<Fn>(g_surface, SURF_DrawPrintText)(g_surface, text, count, draw_type);
}

HFont overlay_create_font() {
  if (!g_surface)
    return 0;
  using Fn = HFont (*)(void *);
  return vfunc<Fn>(g_surface, SURF_CreateFont)(g_surface);
}

bool overlay_add_glyph_set(HFont f, const char *name, int tall, int weight,
                           int blur, int scanlines, int flags, int range_min,
                           int range_max) {
  if (!g_surface || !name)
    return false;
  using Fn = bool (*)(void *, HFont, const char *, int, int, int, int, int, int,
                      int);
  return vfunc<Fn>(g_surface, SURF_AddGlyphSetToFont)(
      g_surface, f, name, tall, weight, blur, scanlines, flags, range_min,
      range_max);
}

void overlay_screen_size(int &w, int &h) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int &, int &);
  vfunc<Fn>(g_surface, SURF_GetScreenSize)(g_surface, w, h);
}

void overlay_text_size(HFont f, const wchar_t *text, int &w, int &h) {
  if (!g_surface || !text)
    return;
  using Fn = void (*)(void *, HFont, const wchar_t *, int &, int &);
  vfunc<Fn>(g_surface, SURF_GetTextSize)(g_surface, f, text, w, h);
}

int overlay_embedded_panel() {
  if (!g_surface)
    return 0;
  using Fn = int (*)(void *);
  return vfunc<Fn>(g_surface, SURF_GetEmbeddedPanel)(g_surface);
}

void overlay_push_make_current(int panel, bool use_insets) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int, bool);
  vfunc<Fn>(g_surface, SURF_PushMakeCurrent)(g_surface, panel, use_insets);
}

void overlay_pop_make_current(int panel) {
  if (!g_surface)
    return;
  using Fn = void (*)(void *, int);
  vfunc<Fn>(g_surface, SURF_PopMakeCurrent)(g_surface, panel);
}