// This file is part of the 64k demo project.
// It implements platform-specific windowing and input using GLFW.
// Handles fullscreen toggling and native surface creation for WebGPU.

#include "platform.h"
#include "glfw3webgpu.h"

#include <GLFW/glfw3.h>

static GLFWwindow *window = nullptr;
static int windowed_x, windowed_y, windowed_w, windowed_h;
static bool g_is_fullscreen = false;

static void glfw_key_callback(GLFWwindow *cb_window, int key, int scancode,
                              int action, int mods) {
  if (action == GLFW_PRESS) {
    if (key == GLFW_KEY_ESCAPE || key == GLFW_KEY_Q) {
      glfwSetWindowShouldClose(cb_window, GLFW_TRUE);
    } else if (key == GLFW_KEY_F) {
      platform_toggle_fullscreen();
    }
  }
}

void platform_init_window(bool fullscreen) {
  glfwInit();
  glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
  window = glfwCreateWindow(1280, 720, "demo64k", nullptr, nullptr);
  glfwSetKeyCallback(window, glfw_key_callback);

  g_is_fullscreen = fullscreen;
  if (fullscreen) {
    // Save current windowed mode dimensions before going fullscreen
    glfwGetWindowPos(window, &windowed_x, &windowed_y);
    glfwGetWindowSize(window, &windowed_w, &windowed_h);

    GLFWmonitor *monitor = glfwGetPrimaryMonitor();
    const GLFWvidmode *mode = glfwGetVideoMode(monitor);
    glfwSetWindowMonitor(window, monitor, 0, 0, mode->width, mode->height,
                         mode->refreshRate);
  }
}

void platform_shutdown() {
  glfwDestroyWindow(window);
  glfwTerminate();
}

void platform_poll() { glfwPollEvents(); }

bool platform_should_close() { return glfwWindowShouldClose(window); }

void platform_toggle_fullscreen() {
  g_is_fullscreen = !g_is_fullscreen;
  if (g_is_fullscreen) {
    glfwGetWindowPos(window, &windowed_x, &windowed_y);
    glfwGetWindowSize(window, &windowed_w, &windowed_h);

    GLFWmonitor *monitor = glfwGetPrimaryMonitor();
    const GLFWvidmode *mode = glfwGetVideoMode(monitor);
    glfwSetWindowMonitor(window, monitor, 0, 0, mode->width, mode->height,
                         mode->refreshRate);
  } else {
    glfwSetWindowMonitor(window, nullptr, windowed_x, windowed_y, windowed_w,
                         windowed_h, 0);
  }
}

GLFWwindow *platform_get_window() { return window; }

double platform_get_time() { return glfwGetTime(); }

WGPUSurface platform_create_wgpu_surface(WGPUInstance instance) {
  return glfwCreateWindowWGPUSurface(instance, window);
}