#include <iostream>
#include <unistd.h>
#include <thread>

#include "chip8.hpp"
#include "platform.hpp"

#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif

#define WINDOW_TITLE "chip8emu"

Platform* platform = nullptr;

Chip8* chip8 = new Chip8();

bool quit = false;

void createPlatform(int videoScale) {
  platform = new Platform(
    WINDOW_TITLE,
    VIDEO_WIDTH * videoScale,
    VIDEO_HEIGHT * videoScale,
    VIDEO_WIDTH, VIDEO_HEIGHT
  );
}

void mainLoop(void* videoScale) {
    platform->Update(chip8->video, *(int*)videoScale);
}

void update(int cycleDelay) {
  while (true) {
    quit = platform->ProcessInput(&chip8->keypad);

#ifdef __EMSCRIPTEN__
    if (quit) emscripten_cancel_main_loop();
    std::this_thread::sleep_for(std::chrono::milliseconds(10));
#else
    usleep(cycleDelay * 1000);
#endif
    chip8->Cycle();
  }
}

int main(int argc, char** argv) {
  if (argc != 4) {
    std::cerr << "Usage: " << argv[0] << " <Scale> <Delay> <ROM>" << std::endl;
    std::exit(EXIT_FAILURE);
  }

  int videoScale = std::stoi(argv[1]);
  int cycleDelay = std::stoi(argv[2]);
  char const* filename = argv[3];

  Table* table = new Table(chip8);

  chip8->SetTable(table);
  chip8->LoadROM(filename);

  createPlatform(videoScale);

  std::thread timerThread(&Chip8::TimerUpdateThread, chip8, platform);
  std::thread updateThread(update, cycleDelay);
#ifdef __EMSCRIPTEN__
  emscripten_set_main_loop_arg(mainLoop, (void*) &videoScale, 0, 1);
#else
  while (!quit)
    mainLoop((void*) &videoScale);
  timerThread.detach();
#endif

  return 0;
}