// Copyright (c) 2021 Dominic Msters
// 
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

#include "glwfwplatform.h"

GLFWwindow *window = NULL;
game_t *runningGame = NULL;

int32_t main() {
  // Attempt to init GLFW
  if(!glfwInit()) return NULL;
  window = glfwCreateWindow(WINDOW_WIDTH_DEFAULT, WINDOW_HEIGHT_DEFAULT,
    "", NULL, NULL
  );
  if(!window) {
    glfwTerminate();
    return 1;
  }

  // Load GLAD
  glfwMakeContextCurrent(window);
  glfwSwapInterval(0);
  gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);

  // Setup window listeners
  glfwSetWindowSizeCallback(window, &glfwOnResize);
  glfwSetKeyCallback(window, &glfwOnKey);

  // Init the game
  if(gameInit()) {
    // Bind initial keys
    inputBind(INPUT_NULL,     (inputsource_t)GLFW_KEY_ESCAPE);
    inputBind(INPUT_UP,       (inputsource_t)GLFW_KEY_UP);
    inputBind(INPUT_DOWN,     (inputsource_t)GLFW_KEY_DOWN);
    inputBind(INPUT_LEFT,     (inputsource_t)GLFW_KEY_LEFT);
    inputBind(INPUT_RIGHT,    (inputsource_t)GLFW_KEY_RIGHT);
    inputBind(INPUT_UP,       (inputsource_t)GLFW_KEY_W);
    inputBind(INPUT_DOWN,     (inputsource_t)GLFW_KEY_S);
    inputBind(INPUT_LEFT,     (inputsource_t)GLFW_KEY_A);
    inputBind(INPUT_RIGHT,    (inputsource_t)GLFW_KEY_D);

    // Init the render resolution
    renderSetResolution(WINDOW_WIDTH_DEFAULT, WINDOW_HEIGHT_DEFAULT);

    // Update the window title.
    glfwSetWindowTitle(window, GAME_STATE.name);

    double time = 0;

    // Main Render Loop 
    while(!glfwWindowShouldClose(window)) {
      glfwPollEvents();

      // Determine the delta.
      double newTime = glfwGetTime();
      float fDelta = (float)(newTime - time);
      time = newTime;

      // Tick the engine.
      if(!gameUpdate(fDelta)) break;
      glfwSwapBuffers(window);
      sleep(0);//Fixes some weird high CPU bug, not actually necessary.
    }

    // Game has finished running, cleanup.
    gameDispose();
  }
  
  // Terminate the GLFW context.
  glfwSetWindowSizeCallback(window, NULL);
  glfwTerminate();

  return 0;
}

void glfwOnResize(GLFWwindow *window, int32_t width, int32_t height) {
  renderSetResolution(width, height);
}

void glfwOnKey(GLFWwindow *window,
  int32_t key, int32_t scancode, int32_t action, int32_t mods
) {
  if(action == GLFW_PRESS) {
    INPUT_STATE.buffer[key] = 1;
  } else if(action == GLFW_RELEASE) {
    INPUT_STATE.buffer[key] = 0;
  }
}