/*

Copyright (c) 1991  X Consortium

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 or substantial portions of the Software.

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 X CONSORTIUM 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.

Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.

*/
/*
 * xditview -- 
 *
 *   Display ditroff output in an X window
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Xatom.h>
#include <X11/Shell.h>
#include <X11/Xos.h>
#include <X11/Xaw/Paned.h>
#include <X11/Xaw/Panner.h>
#include <X11/Xaw/Porthole.h>
#include <X11/Xaw/Viewport.h>
#include <X11/Xaw/Box.h>
#include <X11/Xaw/Command.h>
#include <X11/Xaw/Dialog.h>
#include <X11/Xaw/Label.h>
#include <X11/Xaw/MenuButton.h>
#include <X11/Xaw/SimpleMenu.h>
#include <X11/Xaw/SmeBSB.h>
#include <X11/Xaw/AsciiText.h>

#include "Dvi.h"

#include "xdit.bm"
#include "xdit_mask.bm"
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>

/* Command line options table.  Only resources are entered here...there is a
   pass over the remaining options after XtParseCommand is let loose. */

static XrmOptionDescRec options[] = {
    {"-page",           "*dvi.pageNumber",       XrmoptionSepArg, NULL},
    {"-backingStore",   "*dvi.backingStore",     XrmoptionSepArg, NULL},
    {"-noPolyText",     "*dvi.noPolyText",       XrmoptionNoArg,  "TRUE"},
    {"-resolution",     "*dvi.screenResolution", XrmoptionSepArg, NULL},
};

static char  current_file_name[1024];
static FILE *current_file;

static void MakePrompt(Widget, const char *, void (*)(char *), char *);

/*
 * Report the syntax for calling xditview.
 */

static void
Syntax(const char *call, int exitval)
{
    (void) printf("Usage: %s [-fg <color>] [-bg <color>]\n%s\n", call,
                  "       [-bd <color>] [-bw <pixels>] [-help] [-version]\n"
                  "       [-display displayname] [-geometry geom]\n"
                  "       [-page <page-number>] [-backing <backing-store>]\n"
                  "       [-resolution <screen-resolution>]\n");
    exit(exitval);
}

static void     NewResolution(char *resString);
static void     NewFile(char *name);
static void     DisplayPageNumber(void);
static void     VisitFile(char *name, Boolean resetPage);

static Widget   toplevel, paned, porthole, dvi;
static Widget   popupMenu;
static Widget   menuBar;
static Widget   fileMenuButton, fileMenu;
static Widget   pageNumber;

static void     NextPage(Widget entry, XtPointer name, XtPointer data);
static void     PreviousPage(Widget entry, XtPointer name, XtPointer data);
static void     SetResolution(Widget entry, XtPointer name, XtPointer data);
static void     OpenFile(Widget entry, XtPointer name, XtPointer data);
static void     RevisitFile(Widget entry, XtPointer name, XtPointer data);
static void     Quit(Widget entry, XtPointer closure, XtPointer data);

struct menuEntry {
    char *name;
    void (*function)(Widget entry, XtPointer name, XtPointer data);
};

static struct menuEntry popupMenuEntries[] = {
    {"nextPage",        NextPage},
    {"previousPage",    PreviousPage},
    {"setResolution",   SetResolution},
    {"openFile",        OpenFile},
    {"revisitFile",     RevisitFile},
    {"quit",            Quit}
};

static struct menuEntry fileMenuEntries[] = {
    {"openFile",        OpenFile},
    {"revisitFile",     RevisitFile},
    {"setResolution",   SetResolution},
    {"quit",            Quit}
};

static void NextPageAction(Widget, XEvent *, String *, Cardinal *);
static void PreviousPageAction(Widget, XEvent *, String *, Cardinal *);
static void SetResolutionAction(Widget, XEvent *, String *, Cardinal *);
static void OpenFileAction(Widget, XEvent *, String *, Cardinal *);
static void RevisitFileAction(Widget, XEvent *, String *, Cardinal *);
static void QuitAction(Widget, XEvent *, String *, Cardinal *);
static void AcceptAction(Widget, XEvent *, String *, Cardinal *);
static void CancelAction(Widget, XEvent *, String *, Cardinal *);
static void UpdatePageNumber(Widget, XEvent *, String *, Cardinal *);
static void Noop(Widget, XEvent *, String *, Cardinal *);

static XtActionsRec xditview_actions[] = {
    {"NextPage",        NextPageAction},
    {"PreviousPage",    PreviousPageAction},
    {"SetResolution",   SetResolutionAction},
    {"OpenFile",        OpenFileAction},
    {"Quit",            QuitAction},
    {"Accept",          AcceptAction},
    {"Cancel",          CancelAction},
    {"SetPageNumber",   UpdatePageNumber},
    {"Noop",            Noop}
};

static Atom wm_delete_window;


int
main(int argc, char **argv)
{
    char *          file_name = NULL;
    XtAppContext    xtcontext;
    Arg             topLevelArgs[2];

    XtSetLanguageProc(NULL, (XtLanguageProc) NULL, NULL);

    /* Handle args that don't require opening a display */
    for (int n = 1; n < argc; n++) {
        const char *argn = argv[n];
        /* accept single or double dash for -help & -version */
        if (argn[0] == '-' && argn[1] == '-') {
            argn++;
        }
        if (strcmp(argn, "-help") == 0) {
            Syntax(argv[0], 0);
        }
        if (strcmp(argn, "-version") == 0) {
            puts(PACKAGE_STRING);
            exit(0);
        }
    }

    toplevel = XtAppInitialize(&xtcontext, "Xditview",
                               options, XtNumber(options),
                               &argc, argv, NULL, NULL, 0);
    if (argc > 2) {
        fputs("Unknown argument(s):", stderr);
        for (int n = 1; n < argc; n++) {
            if ((n < (argc -1)) || (argv[n][0] == '-')) {
                fprintf(stderr, " %s", argv[n]);
            }
        }
        fputs("\n\n", stderr);
        Syntax(argv[0], 1);
    }

    XtAppAddActions(xtcontext, xditview_actions, XtNumber(xditview_actions));
    XtOverrideTranslations
        (toplevel, XtParseTranslationTable("<Message>WM_PROTOCOLS: Quit()"));

    XtSetArg(topLevelArgs[0], XtNiconPixmap,
             XCreateBitmapFromData(XtDisplay(toplevel),
                                   XtScreen(toplevel)->root,
                                   (char *) xdit_bits,
                                   xdit_width, xdit_height));

    XtSetArg(topLevelArgs[1], XtNiconMask,
             XCreateBitmapFromData(XtDisplay(toplevel),
                                   XtScreen(toplevel)->root,
                                   (char *) xdit_mask_bits,
                                   xdit_mask_width, xdit_mask_height));
    XtSetValues(toplevel, topLevelArgs, 2);
    if (argc > 1)
        file_name = argv[1];

    /*
     * create the popup menu and insert the entries
     */
    popupMenu = XtCreatePopupShell("popupMenu", simpleMenuWidgetClass, toplevel,
                                   NULL, 0);
    for (Cardinal i = 0; i < XtNumber(popupMenuEntries); i++) {
        Widget entry = XtCreateManagedWidget(popupMenuEntries[i].name,
                                             smeBSBObjectClass, popupMenu,
                                             NULL, (Cardinal) 0);
        XtAddCallback(entry, XtNcallback, popupMenuEntries[i].function, NULL);
    }

    paned = XtCreateManagedWidget("paned", panedWidgetClass, toplevel,
                                  NULL, (Cardinal) 0);
    menuBar = XtCreateManagedWidget("menuBar", boxWidgetClass, paned, NULL, 0);

    fileMenuButton =
        XtCreateManagedWidget("fileMenuButton", menuButtonWidgetClass, menuBar,
                              NULL, (Cardinal) 0);
    fileMenu =
        XtCreatePopupShell("fileMenu", simpleMenuWidgetClass, fileMenuButton,
                           NULL, (Cardinal) 0);
    for (Cardinal i = 0; i < XtNumber(fileMenuEntries); i++) {
        Widget entry = XtCreateManagedWidget(fileMenuEntries[i].name,
                                             smeBSBObjectClass, fileMenu,
                                             NULL, (Cardinal) 0);
        XtAddCallback(entry, XtNcallback, fileMenuEntries[i].function, NULL);
    }

    (void) XtCreateManagedWidget("prevButton", commandWidgetClass,
                                 menuBar, NULL, (Cardinal) 0);

    pageNumber = XtCreateManagedWidget("pageNumber", asciiTextWidgetClass,
                                       menuBar, NULL, (Cardinal) 0);

    (void) XtCreateManagedWidget("nextButton", commandWidgetClass,
                                 menuBar, NULL, (Cardinal) 0);

    porthole = XtCreateManagedWidget("viewport", viewportWidgetClass,
                                     paned, NULL, 0);
    dvi = XtCreateManagedWidget("dvi", dviWidgetClass, porthole, NULL, 0);
    if (file_name)
        VisitFile(file_name, FALSE);
    XtRealizeWidget(toplevel);
    wm_delete_window = XInternAtom(XtDisplay(toplevel), "WM_DELETE_WINDOW",
                                   False);
    (void) XSetWMProtocols(XtDisplay(toplevel), XtWindow(toplevel),
                           &wm_delete_window, 1);
    XtAppMainLoop(xtcontext);

    return 0;
}

static void
DisplayPageNumber(void)
{
    Arg 	arg[2];
    int 	actual_number, last_page;
    XawTextBlock text;
    int 	length;
    char 	value[128];
    char *	cur;

    XtSetArg(arg[0], XtNpageNumber, &actual_number);
    XtSetArg(arg[1], XtNlastPageNumber, &last_page);
    XtGetValues(dvi, arg, 2);
    if (actual_number == 0)
        snprintf(value, sizeof(value), "<none>");
    else if (last_page > 0)
        snprintf(value, sizeof(value), "%d of %d", actual_number, last_page);
    else
        snprintf(value, sizeof(value), "%d", actual_number);
    text.firstPos = 0;
    text.length = strlen(value);
    text.ptr = value;
    text.format = FMT8BIT;
    XtSetArg(arg[0], XtNstring, &cur);
    XtGetValues(XawTextGetSource(pageNumber), arg, 1);
    length = strlen(cur);
    XawTextReplace(pageNumber, 0, length, &text);
}

static void
SetPageNumber(int number)
{
    Arg arg[1];

    XtSetArg(arg[0], XtNpageNumber, number);
    XtSetValues(dvi, arg, 1);
    DisplayPageNumber();
}

static void
UpdatePageNumber(Widget w, XEvent *xev, String *s, Cardinal *c)
{
    char *string;
    Arg arg[1];

    XtSetArg(arg[0], XtNstring, &string);
    XtGetValues(XawTextGetSource(pageNumber), arg, 1);
    SetPageNumber(atoi(string));
}

static void
NewResolution(char *resString)
{
    int res;
    Arg arg[1];

    res = atoi(resString);
    if (res <= 0)
        return;
    XtSetArg(arg[0], XtNscreenResolution, res);
    XtSetValues(dvi, arg, 1);
}

static void
VisitFile(char *name, Boolean resetPage)
{
    Arg arg[3];
    char *n;
    FILE *new_file;
    Boolean seek = 0;
    int i;

    if (current_file) {
        if (!strcmp(current_file_name, "-"))
            ;
        else if (current_file_name[0] == '|')
            pclose(current_file);
        else
            fclose(current_file);
    }
    if (!strcmp(name, "-"))
        new_file = stdin;
    else if (name[0] == '|')
        new_file = popen(name + 1, "r");
    else {
        struct stat stbuf;

        new_file = fopen(name, "r");

        if (!new_file) {
            perror(name);
            return;
        }
        /* Make sure it is a regular file */
        if (fstat(fileno(new_file), &stbuf) != 0) {
            perror(name);
            fclose(new_file);
            return;
        }
        if (!S_ISREG(stbuf.st_mode)) {
            fprintf(stderr, "%s is not a regular file.\n", name);
            fclose(new_file);
            return;
        }

        seek = 1;
    }
    if (!new_file) {
        /* XXX display error message */
        return;
    }
    i = 0;
    XtSetArg(arg[i], XtNfile, new_file);
    i++;
    XtSetArg(arg[i], XtNseek, seek);
    i++;
    if (resetPage) {
        XtSetArg(arg[i], XtNpageNumber, 1);
        i++;
    }
    XtSetValues(dvi, arg, i);
    XtSetArg(arg[0], XtNtitle, name);
    if (name[0] != '/' && (n = strrchr(name, '/')))
        n = n + 1;
    else
        n = name;
    XtSetArg(arg[1], XtNiconName, n);
    XtSetValues(toplevel, arg, 2);
    strncpy(current_file_name, name, sizeof(current_file_name));
    current_file_name[sizeof(current_file_name) - 1] = '\0';
    current_file = new_file;
    DisplayPageNumber();
}

static void
NewFile(char *name)
{
    VisitFile(name, TRUE);
}

static char fileBuf[1024];
static char resolutionBuf[1024];

static void
ResetMenuEntry(Widget entry)
{
    Arg arg[1];

    XtSetArg(arg[0], XtNpopupOnEntry, entry);
    XtSetValues(XtParent(entry), arg, (Cardinal) 1);
}

/*ARGSUSED*/
static void
NextPage(Widget entry, XtPointer name, XtPointer data)
{
    NextPageAction(entry, NULL, NULL, NULL);
    ResetMenuEntry(entry);
}

static void
NextPageAction(Widget w, XEvent *xev, String *s, Cardinal *c)
{
    Arg args[1];
    int number;

    XtSetArg(args[0], XtNpageNumber, &number);
    XtGetValues(dvi, args, 1);
    SetPageNumber(number + 1);
}

/*ARGSUSED*/
static void
PreviousPage(Widget entry, XtPointer name, XtPointer data)
{
    PreviousPageAction(entry, NULL, NULL, NULL);
    ResetMenuEntry(entry);
}

static void
PreviousPageAction(Widget w, XEvent *xev, String *s, Cardinal *c)
{
    Arg args[1];
    int number;

    XtSetArg(args[0], XtNpageNumber, &number);
    XtGetValues(dvi, args, 1);
    SetPageNumber(number - 1);
}

/*ARGSUSED*/
static void
SetResolution(Widget entry, XtPointer name, XtPointer data)
{
    SetResolutionAction(entry, NULL, NULL, NULL);
    ResetMenuEntry(entry);
}

static void
SetResolutionAction(Widget w, XEvent *xev, String *s, Cardinal *c)
{
    Arg args[1];
    int cur;

    XtSetArg(args[0], XtNscreenResolution, &cur);
    XtGetValues(dvi, args, 1);
    snprintf(resolutionBuf, sizeof(resolutionBuf), "%d", cur);
    MakePrompt(toplevel, "Screen resolution:", NewResolution, resolutionBuf);
}

/*ARGSUSED*/
static void
OpenFile(Widget entry, XtPointer name, XtPointer data)
{
    OpenFileAction(entry, NULL, NULL, NULL);
    ResetMenuEntry(entry);
}

static void
OpenFileAction(Widget w, XEvent *xev, String *s, Cardinal *c)
{
    if (current_file_name[0]) {
	strncpy(fileBuf, current_file_name, sizeof(fileBuf));
	fileBuf[sizeof(fileBuf) - 1] = '\0';
    }
    else
        fileBuf[0] = '\0';
    MakePrompt(toplevel, "File to open:", NewFile, fileBuf);
}

/*ARGSUSED*/
static void
RevisitFile(Widget entry, XtPointer name, XtPointer data)
{
    RevisitFileAction(entry, NULL, NULL, NULL);
    ResetMenuEntry(entry);
}

static void
RevisitFileAction(Widget w, XEvent *xev, String *s, Cardinal *c)
{
    if (current_file_name[0])
        VisitFile(current_file_name, FALSE);
}

/*ARGSUSED*/
static void
Quit(Widget entry, XtPointer closure, XtPointer data)
{
    QuitAction(entry, NULL, NULL, NULL);
}

static void
QuitAction(Widget w, XEvent *xev, String *s, Cardinal *c)
{
    exit(0);
}

static Widget promptShell, promptDialog;
static void (*promptfunction)(char *);

/* ARGSUSED */
static void
CancelAction(Widget widget, XEvent *event,
             String *params, Cardinal *num_params)
{
    if (promptShell) {
        XtSetKeyboardFocus(toplevel, (Widget) None);
        XtDestroyWidget(promptShell);
        promptShell = (Widget) 0;
    }
}

/* ARGSUSED */
static void
AcceptAction(Widget widget, XEvent *event,
             String *params, Cardinal *num_params)
{
    (*promptfunction) (XawDialogGetValueString(promptDialog));
    CancelAction(widget, event, params, num_params);
}

static void
Noop(Widget w, XEvent *xev, String *s, Cardinal *c)
{
}

static void
MakePrompt(Widget centerw, const char *prompt, void (*func)(char *), char *def)
{
    static Arg dialogArgs[] = {
        {XtNlabel,(XtArgVal) 0},
        {XtNvalue,(XtArgVal) 0},
    };
    Arg centerArgs[2];
    Position source_x, source_y;
    Position dest_x, dest_y;
    Dimension center_width, center_height;
    Dimension prompt_width, prompt_height;
    Widget valueWidget;

    CancelAction((Widget) NULL, (XEvent *) 0, (String *) 0, (Cardinal *) 0);
    promptShell = XtCreatePopupShell("promptShell", transientShellWidgetClass,
                                     toplevel, NULL, (Cardinal) 0);
    dialogArgs[0].value = (XtArgVal) prompt;
    dialogArgs[1].value = (XtArgVal) def;
    promptDialog = XtCreateManagedWidget("promptDialog", dialogWidgetClass,
                                         promptShell, dialogArgs,
                                         XtNumber(dialogArgs));
    XawDialogAddButton(promptDialog, "accept", NULL, NULL);
    XawDialogAddButton(promptDialog, "cancel", NULL, NULL);
    valueWidget = XtNameToWidget(promptDialog, "value");
    if (valueWidget) {
        Arg valueArgs[1];

        XtSetArg(valueArgs[0], XtNresizable, TRUE);
        XtSetValues(valueWidget, valueArgs, 1);
        /*
         * as resizable isn't set until just above, the
         * default value will be displayed incorrectly.
         * rectify the situation by resetting the values
         */
        XtSetValues(promptDialog, dialogArgs, XtNumber(dialogArgs));
    }
    XtSetKeyboardFocus(promptDialog, valueWidget);
    XtSetKeyboardFocus(toplevel, valueWidget);
    XtRealizeWidget(promptShell);
    /*
     * place the widget in the center of the "parent"
     */
    XtSetArg(centerArgs[0], XtNwidth, &center_width);
    XtSetArg(centerArgs[1], XtNheight, &center_height);
    XtGetValues(centerw, centerArgs, 2);
    XtSetArg(centerArgs[0], XtNwidth, &prompt_width);
    XtSetArg(centerArgs[1], XtNheight, &prompt_height);
    XtGetValues(promptShell, centerArgs, 2);
    source_x = (int) (center_width - prompt_width) / 2;
    source_y = (int) (center_height - prompt_height) / 3;
    XtTranslateCoords(centerw, source_x, source_y, &dest_x, &dest_y);
    XtSetArg(centerArgs[0], XtNx, dest_x);
    XtSetArg(centerArgs[1], XtNy, dest_y);
    XtSetValues(promptShell, centerArgs, 2);
    XtMapWidget(promptShell);
    promptfunction = func;
}