#include <stdio.h>

#include <X11/Xatom.h>
#include "src/utils.h"
#include "src/control.h"

const char *sofname = "ucalc";
const char *version = "0.0.0";
const char *disname = "Unix Calc";

int main() {
  UiSystem ui;
  XEvent event;
  int screen;
  XGCValues values;

  ui.display = XOpenDisplay(NULL);
  if (ui.display == NULL) {
    fprintf(stderr, "画面を開けられません。\n");
    exit(1);
  }

  screen = DefaultScreen(ui.display);

  int sw = DisplayWidth(ui.display, screen);
  int sh = DisplayHeight(ui.display, screen);
  int window_x = (sw - window_width) / 3;
  int window_y = (sh - window_height) / 2;

  ui.window = XCreateSimpleWindow(ui.display,
      RootWindow(ui.display, screen),
      window_x, window_y, window_width, window_height, 1, BTCOL, BGCOL);
  if (!ui.window) {
    cleanup(&ui);
    fprintf(stderr, "ウィンドウを作成に失敗。\n");
    exit(1);
  }

  ui.backbuf = XCreatePixmap(ui.display, ui.window, window_width, window_height,
      DefaultDepth(ui.display, screen));
  ui.target = ui.backbuf;

  Atom net_wm_window_type = XInternAtom(ui.display, "_NET_WM_WINDOW_TYPE", False);
  Atom dialog = XInternAtom(ui.display, "_NET_WM_WINDOW_TYPE_DIALOG", False);

  XChangeProperty(ui.display, ui.window, net_wm_window_type, XA_ATOM, 32,
      PropModeReplace, (unsigned char *)&dialog, 1);

  XStoreName(ui.display, ui.window, disname);
  Atom net_wm_name = XInternAtom(ui.display, "_NET_WM_NAME", False);
  char displayname[16];
  snprintf(displayname, 16, "%s %s", disname, version);
  XChangeProperty(ui.display, ui.window, net_wm_name,
      XInternAtom(ui.display, "UTF8_STRING", False), 8,
      PropModeReplace, (unsigned char *)displayname, strlen(displayname));

  XClassHint *classHint = XAllocClassHint();
  if (classHint) {
    classHint->res_name = "unixcalc";
    classHint->res_class = "UnixCalc";
    XSetClassHint(ui.display, ui.window, classHint);
    XFree(classHint);
  }

  XSetWindowBackground(ui.display, ui.window, BGCOL);

  XSelectInput(ui.display, ui.window,
      ExposureMask
    | ButtonPressMask
    | ButtonReleaseMask
    | KeyPressMask
    // | PointerMotionMask
    // | ButtonMotionMask
    // | StructureNotifyMask
  );

  ui.gc = XCreateGC(ui.display, ui.window, 0, &values);
  if (!ui.gc) {
    cleanup(&ui);
    fprintf(stderr, "GCを作成に失敗。\n");
    exit(1);
  }

  ui.visual = *DefaultVisual(ui.display, screen);

  ui.colormap = XCreateColormap(ui.display, ui.window, &ui.visual, AllocNone);
  if (ui.colormap == None) {
    cleanup(&ui);
    fprintf(stderr, "カラーマップを作成に失敗。\n");
    exit(1);
  }

  ui.font = XftFontOpenName(ui.display, screen, "Noto Sans CJK-12");
  if (!ui.font) {
    cleanup(&ui);
    fprintf(stderr, "フォントの読み込みに失敗。\n");
    exit(1);
  }

  ui.prbfont = XftFontOpenName(ui.display, screen, "Noto Sans CJK-24");
  if (!ui.prbfont) {
    cleanup(&ui);
    fprintf(stderr, "問題フォントの読み込みに失敗。\n");
    exit(1);
  }

  ui.disfont = XftFontOpenName(ui.display, screen, "Noto Sans CJK-72");
  if (!ui.disfont) {
    cleanup(&ui);
    fprintf(stderr, "解決フォントの読み込みに失敗。\n");
    exit(1);
  }

  if (!XftColorAllocName(ui.display, &ui.visual, ui.colormap, "#232020", &ui.color)) {
    cleanup(&ui);
    fprintf(stderr, "色の役割に失敗。\n");
    exit(1);
  }

  XMapWindow(ui.display, ui.window);
  {
    XWindowAttributes attr;
    XGetWindowAttributes(ui.display, ui.window, &attr);
    XEvent fake = { .type = Expose };
    fake.xexpose.window = ui.window;
    fake.xexpose.width = attr.width;
    fake.xexpose.height = attr.height;
    control_expose(&ui, &event);
  }

  while (isrunning) {
    XNextEvent(ui.display, &event);

    switch (event.type) {
      case Expose:
      case ConfigureNotify:
        XClearWindow(ui.display, ui.window);
        control_expose(&ui, &event);
        break;
      case ButtonPress:
        if (event.xbutton.button == Button1) {
          handle_button_press(&ui, event.xbutton.x, event.xbutton.y);
          break;
        }
      case ButtonRelease:
        if (event.xbutton.button == Button1) {
          handle_button_release(&ui, event.xbutton.x, event.xbutton.y);
          break;
        }
      case KeyPress:
        handle_key_press(&ui, &event);
        break;
      // case MotionNotify:
      //   handle_mouse_hover(&ui, &event);
      //   break;
      case ClientMessage:
        // WM_DELETE_WINDOW
        break;
    }
  }

  cleanup(&ui);

  return 0;
}