/*
  Copyright (C) 2000-2004 Carsten Haitzler, Geoff Harrison and various contributors
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to
  deal in the Software without restriction, including without limitation the
  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  sell copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in
  all copies of the Software, its documentation and marketing & publicity
  materials, and acknowledgment shall be given in the documentation, materials
  and software packages that this Software was used.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */

#include "dox.h"

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xosdefs.h>
#include <X11/Xproto.h>
#include <X11/keysym.h>

#ifdef HAS_XINERAMA
#include <X11/extensions/Xinerama.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#if defined(__alpha__) && defined(__GNUC__) && ((__GNUC__ == 2) && (__GNUC_MINOR__ < 96))	/* gets rid of some misalignment in GCC */
#pragma 2
#endif

/* Motif window hints */
#define MWM_HINTS_FUNCTIONS           (1L << 0)
#define MWM_HINTS_DECORATIONS         (1L << 1)

/* bit definitions for MwmHints.functions */
#define MWM_FUNC_ALL            (1L << 0)
#define MWM_FUNC_RESIZE         (1L << 1)
#define MWM_FUNC_MOVE           (1L << 2)
#define MWM_FUNC_MINIMIZE       (1L << 3)
#define MWM_FUNC_MAXIMIZE       (1L << 4)
#define MWM_FUNC_CLOSE          (1L << 5)

/* bit definitions for MwmHints.decorations */
#define MWM_DECOR_ALL                 (1L << 0)
#define MWM_DECOR_BORDER              (1L << 1)
#define MWM_DECOR_RESIZEH             (1L << 2)
#define MWM_DECOR_TITLE               (1L << 3)
#define MWM_DECOR_MENU                (1L << 4)
#define MWM_DECOR_MINIMIZE            (1L << 5)
#define MWM_DECOR_MAXIMIZE            (1L << 6)

#define PROP_MWM_HINTS_ELEMENTS       4

#define STARTPOS 4		/* to bypass next/prev/exit buttons for key binding positions */

typedef struct _mwmhints
{
   CARD32              flags;
   CARD32              functions;
   CARD32              decorations;
   INT32               inputMode;
} MWMHints;

Display            *disp;
Root                VRoot;

#if !USE_IMLIB2
ImlibData          *pI1Ctx;
ImlibImage         *pIcImg;
Drawable            vIcDrw;
#endif
#if USE_FNLIB
FnlibData          *pFnlibData;
#endif
Window              win_main, win_title, win_exit, win_next, win_prev, win_text,
   win_cover;
Imlib_Image        *im_text;
Imlib_Image        *im_title;
Imlib_Image        *im_prev1, *im_prev2;
Imlib_Image        *im_next1, *im_next2;
Imlib_Image        *im_exit1, *im_exit2;
char               *docdir = NULL;

Window              CreateWindow(Window parent, int x, int y, int ww, int hh);
int                 ReadHeader(FILE * f);
int                 ReadPages(FILE * f);

Window
CreateWindow(Window parent, int x, int y, int ww, int hh)
{
   Window              win;
   XSetWindowAttributes attr;
   MWMHints            mwm;

/*   Atom                a; */
   XSizeHints          hnt;

   attr.backing_store = NotUseful;
   attr.override_redirect = False;
   attr.colormap = VRoot.cmap;
   attr.border_pixel = 0;
   attr.background_pixel = 0;
   attr.save_under = False;
   mwm.flags = MWM_HINTS_DECORATIONS;
   mwm.functions = 0;
   mwm.decorations = 0;
   mwm.inputMode = 0;
/*   a = XInternAtom(disp, "_MOTIF_WM_HINTS", False); */
   win = XCreateWindow(disp, parent, x, y, ww, hh, 0, VRoot.depth,
		       InputOutput, VRoot.vis,
		       CWOverrideRedirect | CWSaveUnder | CWBackingStore |
		       CWColormap | CWBackPixel | CWBorderPixel, &attr);
   XSetWindowBackground(disp, win, 0);
/*   XChangeProperty(disp, win, a, a, 32, PropModeReplace,
 * (unsigned char *)&mwm, sizeof(MWMHints) / 4); */
   XStoreName(disp, win, "DOX: Enlightenment Document Viewer");
   hnt.flags = USPosition | USSize | PPosition | PSize | PMinSize | PMaxSize;
   hnt.x = x;
   hnt.y = y;
   hnt.width = ww;
   hnt.height = hh;
   hnt.min_width = ww;
   hnt.max_width = ww;
   hnt.min_height = hh;
   hnt.max_height = hh;
   XSetWMNormalHints(disp, win, &hnt);
   return win;
}

static Imlib_Image *
LoadImage(const char *file)
{
   Imlib_Image        *im;
   char                tmp[4096];

   sprintf(tmp, "%s/E-docs/%s", ENLIGHTENMENT_ROOT, file);
   findLocalizedFile(tmp);
   im = imlib_load_image(tmp);

   return im;
}

static void
ApplyImage1(Window win, Imlib_Image * im)
{
   Pixmap              pmap = 0, mask = 0;

   imlib_context_set_image(im);
   imlib_context_set_drawable(win);
   imlib_render_pixmaps_for_whole_image(&pmap, &mask);
   XSetWindowBackgroundPixmap(disp, win, pmap);
   IMLIB_FREE_PIXMAP_AND_MASK(pmap, mask);
}

static void
ApplyImage2(Window win, Imlib_Image * im)
{
   imlib_context_set_image(im);
   imlib_context_set_drawable(win);
   imlib_render_image_on_drawable(0, 0);
}

#if USE_IMLIB2
#define ApplyImage3(win, im) \
	XClearWindow(disp, win)
#else
#define ApplyImage3 ApplyImage2
#endif

#define FREE_LINKS \
ll = l; \
while (ll) \
{ \
  l = ll; \
  ll = ll->next; \
  free(l->name); \
  free(l); \
}

#define UPDATE_NOW \
{ \
XSetWindowBackgroundPixmap(disp, win_text, draw); \
XClearWindow(disp, win_text); \
}

#define UPDATE \
{ \
  int up_i, up_j; \
  int up_lut[16] = { 0, 8, 4, 12, 2, 6, 10, 14, \
                     3, 11, 1, 9, 7, 13, 5, 15}; \
  XSetWindowBackgroundPixmap(disp, win_text, draw); \
  for (up_j = 0; up_j < 16; up_j++) \
    { \
      for (up_i = 0; up_i < h; up_i += 16) \
        { \
          XClearArea(disp, win_text, 0, up_i + up_lut[up_j], w, 1, False); \
        } \
      XSync(disp, False); \
    } \
}

int
main(int argc, char **argv)
{
   int                 pagenum;
   int                 i, w, h, t, x, y;
   int                 wx, wy;
   FILE               *f;
   char               *s;
   const char         *docfile;
   Pixmap              draw = 0;
   Link               *l = NULL, *ll = NULL;
   Imlib_Border        ibd;

#if !USE_IMLIB2
   ImlibInitParams     params;
#endif
   int                *page_hist = NULL;
   int                 page_hist_len = 1;
   int                 page_hist_pos = 0;

   w = 512;
   h = 400;
   x = 0;
   y = 0;
   pagenum = 0;

   if ((int)(disp = XOpenDisplay(NULL)) < 1)
     {
	printf("%s: Cannot open X display.\n", argv[0]);
	exit(0);
     }

   /* now we'll set the locale */
   setlocale(LC_ALL, "");
   if (!XSupportsLocale())
      setlocale(LC_ALL, "C");
   XSetLocaleModifiers("");
   setlocale(LC_ALL, NULL);

   /* I dont want any internationalisation of my numeric input & output */
   setlocale(LC_NUMERIC, "C");

   VRoot.scr = DefaultScreen(disp);
#if USE_IMLIB2
   VRoot.win = DefaultRootWindow(disp);
   VRoot.vis = DefaultVisual(disp, VRoot.scr);
   VRoot.depth = DefaultDepth(disp, VRoot.scr);
   VRoot.cmap = DefaultColormap(disp, VRoot.scr);

   imlib_set_color_usage(128);

   imlib_context_set_display(disp);
   imlib_context_set_visual(VRoot.vis);
   imlib_context_set_colormap(VRoot.cmap);
   imlib_context_set_dither(1);
   imlib_context_set_dither_mask(0);
#else
   params.flags = PARAMS_IMAGECACHESIZE | PARAMS_PIXMAPCACHESIZE;
   params.imagecachesize = (w * h * 3 * 2);
   params.pixmapcachesize = (w * h * 3 * 2 * 8);
   pI1Ctx = Imlib_init_with_params(disp, &params);
   Imlib_set_render_type(pI1Ctx, RT_DITHER_TRUECOL);
   VRoot.win = pI1Ctx->x.root;
   VRoot.vis = Imlib_get_visual(pI1Ctx);
   VRoot.depth = pI1Ctx->x.depth;
   VRoot.cmap = Imlib_get_colormap(pI1Ctx);
#endif
#if USE_FNLIB
   pFnlibData = Fnlib_init(pI1Ctx);
#endif

   if (argc < 2)
     {
	printf("usage:\n"
	       "%s [-page page_number] [-file Edoc_fname] [-size width height] Edoc_dir\n",
	       argv[0]);
	exit(1);
     }

   docfile = "MAIN";
   for (i = 1; i < argc; i++)
     {
	if ((!strcmp(argv[i], "-page")) && (i < (argc - 1)))
	   pagenum = atoi(argv[++i]);
	else if ((!strcmp(argv[i], "-file")) && (i < (argc - 1)))
	   docfile = argv[++i];
	else if ((!strcmp(argv[i], "-size")) && (i < (argc - 2)))
	  {
	     w = atoi(argv[++i]);
	     h = atoi(argv[++i]);
	  }
	else
	   docdir = strdup(argv[i]);
     }
   if (docdir == NULL)
      docdir = strdup(".");
   s = malloc(strlen(docdir) + strlen(docfile) + 2 + 20);
   sprintf(s, "%s/%s", docdir, docfile);
   findLocalizedFile(s);

   im_title = LoadImage("title.xpm");
   imlib_context_set_image(im_title);
   ibd.left = 50;
   ibd.right = 2;
   ibd.top = 2;
   ibd.bottom = 2;
   imlib_image_set_border(&ibd);
   im_prev1 = LoadImage("prev1.xpm");
   im_prev2 = LoadImage("prev2.xpm");
   im_next1 = LoadImage("next1.xpm");
   im_next2 = LoadImage("next2.xpm");
   im_exit1 = LoadImage("exit1.xpm");
   im_exit2 = LoadImage("exit2.xpm");

   f = fopen(s, "r");
   if (!f)
     {
	strcpy(s, docdir);
	strcat(s, "/");
	strcat(s, docfile);
	f = fopen(s, "r");
	if (!f)
	  {
	     printf("Edoc_dir %s does not contain a %s file\n", docdir,
		    docfile);
	     exit(1);
	  }
     }

   t = 16;
   GetObjects(f);
   fclose(f);
#if USE_FNLIB
   Fnlib_add_dir(pFnlibData, docdir);
#endif
   wx = (DisplayWidth(disp, DefaultScreen(disp)) - w) / 2;
   wy = (DisplayHeight(disp, DefaultScreen(disp)) - (h + t)) / 2;
#ifdef HAS_XINERAMA
   {
      if (XineramaIsActive(disp))
	{
	   Window              rt, ch;
	   int                 d;
	   unsigned int        ud;
	   int                 pointer_x, pointer_y;
	   int                 num;
	   XineramaScreenInfo *screens;

	   XQueryPointer(disp, VRoot.win, &rt, &ch, &pointer_x, &pointer_y,
			 &d, &d, &ud);

	   screens = XineramaQueryScreens(disp, &num);
	   for (i = 0; i < num; i++)
	     {
		if (pointer_x >= screens[i].x_org)
		  {
		     if (pointer_x <= (screens[i].width + screens[i].x_org))
		       {
			  if (pointer_y >= screens[i].y_org)
			    {
			       if (pointer_y <= (screens[i].height +
						 screens[i].y_org))
				 {
				    wx = ((screens[i].width - w) / 2)
				       + screens[i].x_org;
				    wy = ((screens[i].height - (h + t)) / 2)
				       + screens[i].y_org;
				 }
			    }
		       }
		  }
	     }

	   XFree(screens);
	}

   }
#endif
   win_main = CreateWindow(VRoot.win, wx, wy, w, h + t);
   win_title =
      XCreateSimpleWindow(disp, win_main, 0, 0, (w - 64 - 64 - t), t, 0, 0, 0);
   win_prev =
      XCreateSimpleWindow(disp, win_main, (w - 64 - 64 - t), 0, 64, t, 0, 0, 0);
   win_next =
      XCreateSimpleWindow(disp, win_main, (w - 64 - 64 - t) + 64, 0, 64, t, 0,
			  0, 0);
   win_exit =
      XCreateSimpleWindow(disp, win_main, (w - 64 - 64 - t) + 64 + 64, 0, t, t,
			  0, 0, 0);
   win_text = XCreateSimpleWindow(disp, win_main, 0, t, w, h, 0, 0, 0);
   XSelectInput(disp, win_prev, ButtonPressMask | ButtonReleaseMask);
   XSelectInput(disp, win_next, ButtonPressMask | ButtonReleaseMask);
   XSelectInput(disp, win_exit, ButtonPressMask | ButtonReleaseMask);
   XSelectInput(disp, win_text, ButtonPressMask | ButtonReleaseMask |
		KeyPressMask | KeyReleaseMask | PointerMotionMask);

   draw = XCreatePixmap(disp, win_text, w, h, VRoot.depth);

   ApplyImage1(win_title, im_title);
   ApplyImage1(win_prev, im_prev1);
   ApplyImage1(win_next, im_next1);
   ApplyImage1(win_exit, im_exit1);

   l = RenderPage(draw, pagenum, w, h);
   UPDATE_NOW;

   XMapWindow(disp, win_title);
   XMapWindow(disp, win_prev);
   XMapWindow(disp, win_next);
   XMapWindow(disp, win_exit);
   XMapWindow(disp, win_text);
   XMapWindow(disp, win_main);

   XSync(disp, False);
   page_hist = malloc(sizeof(int));

   page_hist[0] = 0;

   for (;;)
     {
	KeySym              key;
	XEvent              ev;

	XNextEvent(disp, &ev);
	switch (ev.type)
	  {
	  case KeyPress:
	     key = XLookupKeysym(&ev.xkey, 0);
	     switch (key)
	       {
	       case XK_Escape:
		  exit(0);
		  break;
	       case XK_Down:
	       case XK_Right:
		  break;
	       case XK_Up:
	       case XK_Left:
		  break;
	       case XK_Return:
		  break;
	       case XK_Home:
		  FREE_LINKS;
		  pagenum = 0;
		  pagenum = FixPage(pagenum);
		  l = RenderPage(draw, pagenum, w, h);
		  UPDATE;
		  break;
	       case XK_End:
		  FREE_LINKS;
		  pagenum = 99999;
		  pagenum = FixPage(pagenum);
		  l = RenderPage(draw, pagenum, w, h);
		  UPDATE;
		  break;
	       case XK_Prior:
		  FREE_LINKS;
		  pagenum--;
		  pagenum = FixPage(pagenum);
		  l = RenderPage(draw, pagenum, w, h);
		  UPDATE;
		  break;
	       case XK_Next:
		  FREE_LINKS;
		  pagenum++;
		  pagenum = FixPage(pagenum);
		  l = RenderPage(draw, pagenum, w, h);
		  UPDATE;
		  break;
	       }
	     break;
	  case ButtonPress:
	     if (ev.xbutton.window == win_prev)
		ApplyImage2(win_prev, im_prev2);
	     else if (ev.xbutton.window == win_next)
		ApplyImage2(win_next, im_next2);
	     else if (ev.xbutton.window == win_exit)
		ApplyImage2(win_exit, im_exit2);
	     else
	       {
		  x = ev.xbutton.x;
		  y = ev.xbutton.y;
		  ll = l;
		  while (ll)
		    {
		       if ((x >= ll->x) && (y >= ll->y) &&
			   (x < (ll->x + ll->w)) && (y < (ll->y + ll->h)))
			 {
			    int                 pg;

			    if (!strncmp("EXEC.", ll->name, 5))
			      {
				 if (!fork())
				   {
				      char               *exe;

				      exe = &(ll->name[5]);
				      execl("/bin/sh", "/bin/sh", "-c", exe,
					    NULL);
				      exit(0);
				   }
			      }
			    else if (!strncmp("INPUT.", ll->name, 6))
			      {
				 FILE               *p;
				 char               *exe, tmp[1024];

				 exe = &(ll->name[6]);
				 if (exe[0] != '/')
				   {
				      sprintf(tmp, "%s/%s", docdir, exe);
				      findLocalizedFile(tmp);
				      exe = tmp;
				   }
				 p = popen(exe, "r");
				 if (p)
				   {
				      int                 dirlen = 0;
				      char               *sp;

				      sp = exe;
				      while ((*sp) && (*sp != ' '))
					 sp++;
				      while ((*sp != '/') && (sp != exe))
					 sp--;
				      dirlen = sp - exe;
				      if (dirlen > 1)
					{
					   free(docdir);
					   docdir = malloc(dirlen + 1);
					   memcpy(docdir, exe, dirlen);
					   docdir[dirlen] = 0;
					}
				      GetObjects(p);
				      pclose(p);
				      if (page_hist)
					 free(page_hist);
				      page_hist = malloc(sizeof(int));

				      page_hist[0] = 0;
				      page_hist_len = 1;
				      pagenum = 0;
				      page_hist_pos = 0;
				      FREE_LINKS;
				      l = RenderPage(draw, pagenum, w, h);
				      UPDATE;
				   }
			      }
			    else
			      {
				 pg = GetPage(ll->name);
				 if (pg >= 0)
				   {
				      FREE_LINKS;
				      pagenum = pg;
				      page_hist_pos++;
				      if (page_hist_pos >= page_hist_len)
					{
					   page_hist_len++;
					   page_hist =
					      realloc(page_hist,
						      sizeof(int) *
						      page_hist_len);
					}
				      page_hist[page_hist_pos] = pagenum;
				      l = RenderPage(draw, pagenum, w, h);
				      UPDATE;
				   }
			      }
			    break;
			 }
		       ll = ll->next;
		    }
	       }
	     break;
	  case ButtonRelease:
	     if (ev.xbutton.window == win_prev)
	       {
		  ApplyImage3(win_prev, im_prev1);
		  FREE_LINKS;
		  page_hist_pos--;
		  if (page_hist_pos < 0)
		     page_hist_pos = 0;
		  pagenum = page_hist[page_hist_pos];
		  l = RenderPage(draw, pagenum, w, h);
		  UPDATE;
	       }
	     else if (ev.xbutton.window == win_next)
	       {
		  int                 prev_pagenum;

		  ApplyImage3(win_next, im_next1);
		  prev_pagenum = pagenum;
		  pagenum++;
		  pagenum = FixPage(pagenum);
		  if (pagenum != prev_pagenum)
		    {
		       FREE_LINKS;
		       page_hist_pos++;
		       if (page_hist_pos >= page_hist_len)
			 {
			    page_hist_len++;
			    page_hist = realloc(page_hist,
						sizeof(int) * page_hist_len);

			    page_hist[page_hist_pos] = pagenum;
			 }
		       else
			  page_hist[page_hist_pos] = pagenum;
		       l = RenderPage(draw, pagenum, w, h);
		       UPDATE;
		    }
	       }
	     else if (ev.xbutton.window == win_exit)
	       {
		  ApplyImage3(win_exit, im_exit1);
		  exit(0);
	       }
	     break;
	  case EnterNotify:
	     break;
	  case LeaveNotify:
	     break;
	  case MotionNotify:
	     while (XCheckTypedEvent(disp, ev.type, &ev));
	     {
		static Link        *pl = NULL;
		char                found = 0;

		x = ev.xmotion.x;
		y = ev.xmotion.y;
		ll = l;
		while (ll)
		  {
		     if ((x >= ll->x) && (y >= ll->y) &&
			 (x < (ll->x + ll->w)) && (y < (ll->y + ll->h)))
		       {
			  GC                  gc;
			  XGCValues           gcv;
			  int                 r, g, b;
			  XColor              xclr;

			  if (pl != ll)
			    {
			       if (pl)
				 {
				    UPDATE_NOW;
				 }
			       GetLinkColors(pagenum, &r, &g, &b);
			       ESetColor(&xclr, r, g, b);
			       EAllocColor(&xclr);
			       gc = XCreateGC(disp, win_text, 0, &gcv);
			       XSetForeground(disp, gc, xclr.pixel);
			       XDrawRectangle(disp, win_text, gc, ll->x, ll->y,
					      ll->w, ll->h);
			       XFreeGC(disp, gc);
			       pl = ll;
			    }
			  found = 1;
			  ll = NULL;
		       }
		     if (ll)
			ll = ll->next;
		  }
		if (!found)
		  {
		     UPDATE_NOW;
		     pl = NULL;
		  }
	     }
	     break;
	  default:
	     break;
	  }
     }
}

void
ESetColor(XColor * pxc, int r, int g, int b)
{
   pxc->red = (r << 8) | r;
   pxc->green = (g << 8) | g;
   pxc->blue = (b << 8) | b;
}

void
EGetColor(XColor * pxc, int *pr, int *pg, int *pb)
{
   *pr = pxc->red >> 8;
   *pg = pxc->green >> 8;
   *pb = pxc->blue >> 8;
}