/* Copyright (c) 1994-1996 David Hogan, see README for licence details */
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <X11/X.h>
#include <X11/Xos.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#ifdef SHAPE
#include <X11/extensions/shape.h>
#endif
#include <X11/extensions/Xrandr.h>
#include "config.h"
#ifdef VIRTNOTIFY
#include <libnotify/notify.h>
#endif
#include "dat.h"
#include "fns.h"
#include "patchlevel.h"

char* version[] = {
  "ryudo version 1.2.2\nCopyright (c) 1994-1996 David Hogan,\n(c) 2004 Russ "
  "Cox,\n(c) 2019-2022 Derek Stevens",
  0};

Display* dpy;
ScreenInfo* screens;
int initting;
XFontStruct* font;
int nostalgia;
char** myargv;
char* termprog;
char* shell;
Bool shape;
int _border = 4;
int _corner = 25;
int _inset = 1;
int curtime;
int debug;
int signalled;
int scrolling;
int num_screens;
int solidsweep = 0;
int numvirtuals = 0;
int ffm = 0;
int kbLaunch = 0;
int zoom = 0;

Atom exit_rio;
Atom restart_rio;
Atom wm_state;
Atom wm_change_state;
Atom wm_protocols;
Atom wm_delete;
Atom wm_take_focus;
Atom wm_lose_focus;
Atom wm_colormaps;
Atom _rio_running;
Atom _rio_hold_mode;
Atom wm_state_fullscreen;
Atom wm_state;

char* fontlist[] = FONTLIST;

void usage(void) {
  fprintf(
    stderr,
    "usage: ryudo [-ffm] [-font fname] [-s] [-term prog] [-version] [-virtuals "
    "num] [exit|restart]\n");
  exit(1);
}

int main(int argc, char* argv[]) {
  int i, do_exit, do_restart;
  char* fname;
  int shape_event;
#ifdef SHAPE
  int dummy;
#endif

  shape_event = 0;
  myargv = argv; /* for restart */

  do_exit = do_restart = 0;
  font = 0;
  fname = 0;
  for (i = 1; i < argc; i++)
    if (strcmp(argv[i], "-nostalgia") == 0)
      nostalgia++;
    else if (strcmp(argv[i], "-debug") == 0)
      debug++;

    else if (strcmp(argv[i], "-ffm") == 0)
      ffm++;

    else if (strcmp(argv[i], "-font") == 0 && i + 1 < argc) {
      i++;
      fname = argv[i];
    } else if (strcmp(argv[i], "-term") == 0 && i + 1 < argc)
      termprog = argv[++i];
    else if (strcmp(argv[i], "-virtuals") == 0 && i + 1 < argc) {
      numvirtuals = atoi(argv[++i]);
      if (numvirtuals < 0 || numvirtuals > 12) {
        fprintf(
          stderr,
          "ryudo: wrong number of virtual displays, defaulting to 4\n");
        numvirtuals = 4;
      }
    } else if (strcmp(argv[i], "-version") == 0) {
      fprintf(stderr, "%s", version[0]);
      if (PATCHLEVEL > 0)
        fprintf(stderr, "; patch level %d", PATCHLEVEL);
      fprintf(stderr, "\n");
      exit(0);
    } else if (strcmp(argv[i], "-s") == 0) {
      scrolling = 1;
    } else if (argv[i][0] == '-')
      usage();
    else
      break;
  for (; i < argc; i++)
    if (strcmp(argv[i], "exit") == 0)
      do_exit++;
    else if (strcmp(argv[i], "restart") == 0)
      do_restart++;
    else
      usage();

  if (do_exit && do_restart)
    usage();

  shell = (char*)getenv("SHELL");
  if (shell == NULL)
    shell = DEFSHELL;

  dpy = XOpenDisplay("");
  if (dpy == 0)
    fatal("can't open display");

  initting = 1;
  XSetErrorHandler(handler);
  if (signal(SIGTERM, sighandler) == SIG_IGN)
    signal(SIGTERM, SIG_IGN);
  if (signal(SIGINT, sighandler) == SIG_IGN)
    signal(SIGINT, SIG_IGN);
  if (signal(SIGHUP, sighandler) == SIG_IGN)
    signal(SIGHUP, SIG_IGN);

  exit_rio = XInternAtom(dpy, "9WM_EXIT", False);
  restart_rio = XInternAtom(dpy, "9WM_RESTART", False);

  curtime = -1; /* don't care */
  if (do_exit) {
    sendcmessage(DefaultRootWindow(dpy), exit_rio, 0L, 1, 1);
    XSync(dpy, False);
    exit(0);
  }
  if (do_restart) {
    sendcmessage(DefaultRootWindow(dpy), restart_rio, 0L, 1, 1);
    XSync(dpy, False);
    exit(0);
  }

  if (0)
    XSynchronize(dpy, True);

  wm_state = XInternAtom(dpy, "WM_STATE", False);
  wm_change_state = XInternAtom(dpy, "WM_CHANGE_STATE", False);
  wm_protocols = XInternAtom(dpy, "WM_PROTOCOLS", False);
  wm_delete = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
  wm_take_focus = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
  wm_lose_focus = XInternAtom(dpy, "_9WM_LOSE_FOCUS", False);
  wm_colormaps = XInternAtom(dpy, "WM_COLORMAP_WINDOWS", False);
  _rio_running = XInternAtom(dpy, "_9WM_RUNNING", False);
  _rio_hold_mode = XInternAtom(dpy, "_9WM_HOLD_MODE", False);
  wm_state = XInternAtom(dpy, "_NET_WM_STATE", False);
  wm_state_fullscreen = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);

  if (fname != 0)
    if ((font = XLoadQueryFont(dpy, fname)) == 0)
      fprintf(stderr, "ryudo: warning: can't load font %s\n", fname);

  if (font == 0) {
    i = 0;
    for (;;) {
      fname = fontlist[i++];
      if (fname == 0) {
        fprintf(stderr, "ryudo: warning: can't find a font\n");
        break;
      }
      font = XLoadQueryFont(dpy, fname);
      if (font != 0)
        break;
    }
  }
  if (nostalgia) {
    _border--;
    _inset--;
  }

#ifdef SHAPE
  shape = XShapeQueryExtension(dpy, &shape_event, &dummy);
#endif

  num_screens = ScreenCount(dpy);
  screens = (ScreenInfo*)malloc(sizeof(ScreenInfo) * num_screens);

  for (i = 0; i < num_screens; i++)
    initscreen(&screens[i], i, 0);

  initb2menu(numvirtuals);

  /* set selection so that 9term knows we're running */
  curtime = CurrentTime;
  XSetSelectionOwner(dpy, _rio_running, screens[0].menuwin, timestamp());

  XSync(dpy, False);
  initting = 0;

  nofocus();

  for (i = 0; i < num_screens; i++)
    scanwins(&screens[i]);

#ifdef VIRTNOTIFY
  notify_init("ryudo");
#endif
  keysetup();
  mainloop(shape_event);
#ifdef VIRTNOTIFY
  notify_uninit();
#endif
  return 0;
}

void initscreen(ScreenInfo* s, int i, int background) {
  char *ds, *colon, *dot1;
  unsigned long mask;
  unsigned long gmask;
  XGCValues gv;
  XSetWindowAttributes attr;
  XVisualInfo xvi;
  XSetWindowAttributes attrs;

  s->num = i;
  s->root = RootWindow(dpy, i);
  s->def_cmap = DefaultColormap(dpy, i);
  s->min_cmaps = MinCmapsOfScreen(ScreenOfDisplay(dpy, i));
  s->depth = DefaultDepth(dpy, i);

  /*
   * Figure out underlying screen format.
   */
  if (
    XMatchVisualInfo(dpy, i, 16, TrueColor, &xvi) ||
    XMatchVisualInfo(dpy, i, 16, DirectColor, &xvi)) {
    s->vis = xvi.visual;
    s->depth = 16;
  } else if (
    XMatchVisualInfo(dpy, i, 15, TrueColor, &xvi) ||
    XMatchVisualInfo(dpy, i, 15, DirectColor, &xvi)) {
    s->vis = xvi.visual;
    s->depth = 15;
  } else if (
    XMatchVisualInfo(dpy, i, 24, TrueColor, &xvi) ||
    XMatchVisualInfo(dpy, i, 24, DirectColor, &xvi)) {
    s->vis = xvi.visual;
    s->depth = 24;
  } else if (
    XMatchVisualInfo(dpy, i, 8, PseudoColor, &xvi) ||
    XMatchVisualInfo(dpy, i, 8, StaticColor, &xvi)) {
    s->vis = xvi.visual;
    s->depth = 8;
  } else {
    s->depth = DefaultDepth(dpy, i);
    if (s->depth != 8) {
      fprintf(stderr, "can't understand depth %d screen", s->depth);
      exit(1);
    }
    s->vis = DefaultVisual(dpy, i);
  }
  if (DefaultDepth(dpy, i) != s->depth) {
    s->def_cmap = XCreateColormap(dpy, s->root, s->vis, AllocNone);
  }

  ds = DisplayString(dpy);
  colon = rindex(ds, ':');
  if (colon && num_screens > 1) {
    strcpy(s->display, "DISPLAY=");
    strcat(s->display, ds);
    colon = s->display + 8 + (colon - ds); /* use version in buf */
    dot1 = index(colon, '.');              /* first period after colon */
    if (!dot1)
      dot1 = colon + strlen(colon); /* if not there, append */
    sprintf(dot1, ".%d", i);
  } else
    s->display[0] = '\0';

  s->black = BlackPixel(dpy, i);
  s->white = WhitePixel(dpy, i);
  s->activeholdborder = colorpixel(dpy, s, s->depth, SHOLDCOL, s->white);
  s->inactiveholdborder = colorpixel(dpy, s, s->depth, HOLDCOL, s->black);
  s->activeborder = colorpixel(dpy, s, s->depth, SBORDERCOL, s->black);
  s->inactiveborder = colorpixel(dpy, s, s->depth, BORDERCOL, s->white);
  s->red = colorpixel(dpy, s, s->depth, GHOSTCOL, s->white);
  s->width = WidthOfScreen(ScreenOfDisplay(dpy, i));
  s->height = HeightOfScreen(ScreenOfDisplay(dpy, i));
  s->bkup[0] =
    XCreatePixmap(dpy, s->root, 2 * s->width, BORDER, DefaultDepth(dpy, i));
  s->bkup[1] =
    XCreatePixmap(dpy, s->root, BORDER, 2 * s->height, DefaultDepth(dpy, i));

  gv.foreground = s->black ^ s->white;
  gv.background = s->white;
  gv.function = GXxor;
  gv.line_width = 0;
  gv.subwindow_mode = IncludeInferiors;
  gmask =
    GCForeground | GCBackground | GCFunction | GCLineWidth | GCSubwindowMode;
  if (font != 0) {
    gv.font = font->fid;
    gmask |= GCFont;
  }
  s->gc = XCreateGC(dpy, s->root, gmask, &gv);

  gv.function = GXcopy;
  s->gccopy = XCreateGC(dpy, s->root, gmask, &gv);

  gv.foreground = s->red;
  s->gcred = XCreateGC(dpy, s->root, gmask, &gv);

  gv.foreground = colorpixel(dpy, s, s->depth, 0xEEEEEE, s->black);
  s->gcsweep = XCreateGC(dpy, s->root, gmask, &gv);

  initcurs(s);

  attr.cursor = s->arrow;
  attr.event_mask = SubstructureRedirectMask | SubstructureNotifyMask |
                    ColormapChangeMask | ButtonPressMask | ButtonReleaseMask |
                    PropertyChangeMask | KeyPressMask | EnterWindowMask;
  mask = CWCursor | CWEventMask;
  XChangeWindowAttributes(dpy, s->root, mask, &attr);
  XSync(dpy, False);

  attrs.border_pixel = colorpixel(dpy, s, s->depth, MBORDERCOL, s->black);
  attrs.background_pixel = colorpixel(dpy, s, s->depth, MENUBGCOL, s->white);
  attrs.colormap = s->def_cmap;

  s->menuwin = XCreateWindow(
    dpy,
    s->root,
    0,
    0,
    1,
    1,
    MENUBORDER,
    s->depth,
    CopyFromParent,
    s->vis,
    CWBackPixel | CWBorderPixel | CWColormap,
    &attrs);

  gv.foreground = colorpixel(dpy, s, s->depth, MENUBGCOL, s->black);
  s->gcmenubg = XCreateGC(dpy, s->menuwin, gmask, &gv);

  gv.foreground = colorpixel(dpy, s, s->depth, SMENUBGCOL, s->white);
  s->gcmenubgs = XCreateGC(dpy, s->menuwin, gmask, &gv);

  gv.foreground = colorpixel(dpy, s, s->depth, MENUFGCOL, s->white);
  gv.background = colorpixel(dpy, s, s->depth, MENUBGCOL, s->black);
  s->gcmenufg = XCreateGC(dpy, s->menuwin, gmask, &gv);

  gv.foreground = colorpixel(dpy, s, s->depth, SMENUFGCOL, s->white);
  gv.background = colorpixel(dpy, s, s->depth, SMENUBGCOL, s->black);
  s->gcmenufgs = XCreateGC(dpy, s->menuwin, gmask, &gv);

  attrs.border_pixel = s->red;
  attrs.background_pixel = colorpixel(dpy, s, s->depth, 0xEEEEEE, s->black);
  attrs.colormap = s->def_cmap;
  s->sweepwin = XCreateWindow(
    dpy,
    s->root,
    0,
    0,
    1,
    1,
    4,
    s->depth,
    CopyFromParent,
    s->vis,
    CWBackPixel | CWBorderPixel | CWColormap,
    &attrs);

  XRRSelectInput(dpy, DefaultRootWindow(dpy), RRScreenChangeNotifyMask);
  fetchmonitorinfo();
}

ScreenInfo* getscreen(Window w) {
  int i;

  for (i = 0; i < num_screens; i++)
    if (screens[i].root == w)
      return &screens[i];

  return 0;
}

Time timestamp(void) {
  XEvent ev;

  if (curtime == CurrentTime) {
    XChangeProperty(
      dpy,
      screens[0].root,
      _rio_running,
      _rio_running,
      8,
      PropModeAppend,
      (unsigned char*)"",
      0);
    XMaskEvent(dpy, PropertyChangeMask, &ev);
    curtime = ev.xproperty.time;
  }
  return curtime;
}

void sendcmessage(Window w, Atom a, long x, int isroot, int usemask) {
  XEvent ev;
  int status;
  long mask;

  memset(&ev, 0, sizeof(ev));
  ev.xclient.type = ClientMessage;
  ev.xclient.window = w;
  ev.xclient.message_type = a;
  ev.xclient.format = 32;
  ev.xclient.data.l[0] = x;
  ev.xclient.data.l[1] = timestamp();
  mask = 0;
  if (usemask) {
    mask |= KeyPressMask; /* seems to be necessary */
    if (isroot)
      mask |= SubstructureRedirectMask; /* magic! */
    else
      mask |= ExposureMask; /* not really correct but so be it */
  }
  status = XSendEvent(dpy, w, False, mask, &ev);
  if (status == 0)
    fprintf(stderr, "ryudo: sendcmessage failed\n");
}

void sendconfig(Client* c) {
  XConfigureEvent ce;

  ce.type = ConfigureNotify;
  ce.event = c->window;
  ce.window = c->window;
  ce.x = c->x;
  ce.y = c->y;
  ce.width = c->dx;
  ce.height = c->dy;
  ce.border_width = c->border;
  ce.above = None;
  ce.override_redirect = 0;
  XSendEvent(dpy, c->window, False, StructureNotifyMask, (XEvent*)&ce);
}

void sighandler(void) { signalled = 1; }

void getevent(XEvent* e) {
  int fd;
  fd_set rfds;
  struct timeval t;

  if (!signalled) {
    if (QLength(dpy) > 0) {
      XNextEvent(dpy, e);
      return;
    }
    fd = ConnectionNumber(dpy);
    FD_ZERO(&rfds);
    FD_SET(fd, &rfds);
    t.tv_sec = t.tv_usec = 0;
    if (select(fd + 1, &rfds, NULL, NULL, &t) == 1) {
      XNextEvent(dpy, e);
      return;
    }
    XFlush(dpy);
    FD_SET(fd, &rfds);
    if (select(fd + 1, &rfds, NULL, NULL, NULL) == 1) {
      XNextEvent(dpy, e);
      return;
    }
    if (errno != EINTR || !signalled) {
      perror("ryudo: select failed");
      exit(1);
    }
  }
  fprintf(stderr, "ryudo: exiting on signal\n");
  cleanup();
  exit(1);
}

void cleanup(void) {
  Client *c, *cc[2], *next;
  XWindowChanges wc;
  int i;

  /* order of un-reparenting determines final stacking order... */
  cc[0] = cc[1] = 0;
  for (c = clients; c; c = next) {
    next = c->next;
    i = normal(c);
    c->next = cc[i];
    cc[i] = c;
  }

  for (i = 0; i < 2; i++) {
    for (c = cc[i]; c; c = c->next) {
      if (!withdrawn(c)) {
        XReparentWindow(dpy, c->window, c->screen->root, c->x, c->y);
      }
      wc.border_width = c->border;
      XConfigureWindow(dpy, c->window, CWBorderWidth, &wc);
    }
  }

  XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, timestamp());
  for (i = 0; i < num_screens; i++)
    cmapnofocus(&screens[i]);
  XCloseDisplay(dpy);
}