/*
 * $Xorg: print.c,v 1.1 2004/04/30 02:05:54 gisburn Exp $
 *
Copyright 2004 Roland Mainz <roland.mainz@nrubsig.org>

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

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
OPEN GROUP 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 Open Group 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 Open Group.
 *
 */

/* Turn a NULL pointer string into an empty string */
#define NULLSTR(x) (((x)!=NULL)?(x):(""))

#define Error(x) { printf x ; exit(EXIT_FAILURE); }
#define Assertion(expr, msg) { if (!(expr)) { Error msg } }
#define Log(x)   { if(True) printf x; }

#include "xmore.h"
#include "print.h"
#include <X11/Xaw/Form.h>
#include <X11/Xaw/Label.h>
#include <X11/Xaw/AsciiText.h> 
#include <stdio.h>
#include <stdlib.h>

#define PRINT_PAGEHEADER 1

static Widget
CreatePrintShell(Widget    videoshell,
                 Screen   *pscreen, 
                 String    printshell_name,
                 ArgList   args,
                 Cardinal  numargs)
{
    String   videoname,
             videoclass;
    Widget   pappshell,
             printshell;
    Display *pdpy = XDisplayOfScreen(pscreen);
    int      dummyc = 0;
    String   dummys = "";
    XtGetApplicationNameAndClass(XtDisplay(videoshell), 
                                 &videoname, &videoclass);

    /* XXX: Why is the |dummyc|&&|dummys| stuff needed here ? */
    XtDisplayInitialize(XtWidgetToApplicationContext(videoshell), pdpy,
                        videoname, videoclass,
                        NULL, 0,
                        &dummyc, &dummys);

    pappshell = XtVaAppCreateShell(videoname, videoclass,
                                   applicationShellWidgetClass,
                                   pdpy,
                                   XtNscreen, pscreen,
                                   NULL);
    printshell = XtCreatePopupShell(printshell_name,
                                    xawPrintShellWidgetClass,
                                    pappshell, args, numargs);
                                

    /* we're mapping/unmapping at start/end page time */
    XtSetMappedWhenManaged(printshell, False);

    /* We realise the widget when we're done with building the widget tree... */
    
    return printshell;
}

typedef struct
{
  Widget      toplevel;
  Bool        isPrinting;
  Widget      printshell;
  struct
  {
      Widget form;
      Widget pageheaderlabel;
      Widget text;
  } content; /* content to print */
  int         numpages;
  Display    *pdpy;
  Screen     *pscreen;
  XPContext   pcontext;
  void       *printtofile_handle;
  const char *jobtitle;
} AppPrintData;

static AppPrintData  apdx;
static AppPrintData *apd = &apdx;

/* Count pages in a text widget
 * WARNING: This will reset the current position of the text widget
 * back to the beginning */
static
long CountPages(Widget textWidget)
{
    long numpages = 0;

    XawTextPosition prevpagepos = -1,
                    currpos = 0;        

    /* Move to the top of the file... */
    XtCallActionProc(textWidget, "beginning-of-file", NULL, NULL, 0);
    
    /* ... count pages ...*/
    do
    {
        prevpagepos = XawTextTopPosition(textWidget);
        XtCallActionProc(textWidget, "next-page", NULL, NULL, 0);        
        currpos     = XawTextTopPosition(textWidget);
        numpages++;
    } while(prevpagepos != currpos);            

    /* ... and move to the top of the file... */
    XtCallActionProc(textWidget, "beginning-of-file", NULL, NULL, 0);

    return numpages;
}

static
int GetCurrPageNum(Widget printshell)
{
    Cardinal n;
    Arg      args[2];
    int      pagenum = -666; /* bah! */
    
    n = 0;
    XtSetArg(args[n], XawNcurrPageNumInJob, &pagenum); n++;
    XtGetValues(printshell, args, n);

    return pagenum;
}

static void 
PageSetupCB(Widget widget, XtPointer client_data, XtPointer call_data)
{
    Widget                       pshell = widget;
    XawPrintShellCallbackStruct *psp    = (XawPrintShellCallbackStruct *)call_data;
    AppPrintData                *p      = (AppPrintData *)client_data;
   
    Log(("--> PageSetupCB\n"));

    if (!psp->last_page_in_job) {
        int  currpage = GetCurrPageNum(pshell);
#ifdef PRINT_PAGEHEADER
        char buffer[256]; 
        sprintf(buffer, "Title: %s / Page: %d/%d", p->jobtitle, currpage, p->numpages);
        XtVaSetValues(apd->content.pageheaderlabel, XtNlabel, buffer, NULL);
#endif /* PRINT_PAGEHEADER */

        /* Note: XawPrintShell's pagecount starts with '1'
         * (=first page is page no. '1') */
        if (currpage > 1) {
            Log(("pagedown %d\n", currpage));
            XtCallActionProc(p->content.text, "next-page", NULL, NULL, 0);
        }
        else
        {
            Log(("first page\n"));
        }              
      
        if (currpage >= p->numpages) {
            psp->last_page_in_job = True;
        }
    }
}

void FinishPrinting(AppPrintData *p)
{
    if (p->printtofile_handle) {
        if (XpuWaitForPrintFileChild(p->printtofile_handle) != XPGetDocFinished) {
            fprintf(stderr, "%s: Error while printing to file.\n", ProgramName);
        }
        p->printtofile_handle = NULL;
    }   

    if (p->printshell) {
        XtDestroyWidget(p->printshell);
        p->printshell = NULL;
    }
  
    /* |p->pdpy| and |p->pcontext| are destroyed when th
     * print dialog widget gets destroyed. */

    p->toplevel   = NULL;
    p->isPrinting = False;
    p->pdpy       = NULL;
    p->pscreen    = NULL;
    p->pcontext   = None;
}

static
void PrintEndJobCB(Widget pshell, XtPointer client_data, XtPointer call_data)
{
    AppPrintData *p = (AppPrintData *)client_data;

    Log(("--> PrintEndJobCB\n"));

    /* Finish printing and destroy print shell (it's legal to destroy Xt
     * widgets from within it's own callbacks) */
    FinishPrinting(p);
}

XFontStruct *GetPrintTextFont(Display *pdpy, long dpi)
{
    XFontStruct *font;
    char         fontname[1024];
    
    sprintf(fontname, "-adobe-courier-medium-r-normal--40-*-%ld-%ld-*-*-iso8859-1", dpi, dpi);
    font = XLoadQueryFont(pdpy, fontname);
    if (!font) {          
        sprintf(fontname, "-*-*-*-*-*-*-*-160-%ld-%ld-*-*-iso8859-1", dpi, dpi);
        font = XLoadQueryFont(pdpy, fontname);
    }
    if (!font)
        Error(("XLoadQueryFont failure.\n"));
    return font;
}

void DoPrint(Widget toplevel, Display *pdpy, XPContext pcontext, 
             const char *jobtitle, const char *toFile)
{
    long         dpi = 0;
    int          n;
    Arg          args[20];
    XFontStruct *textfont = NULL;
  
    if (apd->isPrinting) {
        fprintf(stderr, "%s: Already busy with printing.\n", ProgramName);
        return;
    } 
        
    /* Configure the print context (paper size, title etc.)
     * We must do this before creating any Xt widgets - otherwise they will
     * make wrong assuptions about fonts, resultions etc. ...
     */
    XpuSetJobTitle(pdpy, pcontext, jobtitle);
    
    /* Configuration done, set the context */
    XpSetContext(pdpy, pcontext);   

    /* Get default printer resolution */   
    if (XpuGetResolution(pdpy, pcontext, &dpi) != 1) {
        fprintf(stderr, "%s: No default resolution for printer.\n", ProgramName);
        XpuClosePrinterDisplay(pdpy, pcontext);
        return;
    }
    
    apd->toplevel = toplevel;
    apd->pdpy     = pdpy;
    apd->pcontext = pcontext;
    apd->pscreen  = XpGetScreenOfContext(pdpy, pcontext);
    apd->jobtitle = jobtitle;

    n = 0;
    XtSetArg(args[n], XawNlayoutMode, XawPrintLAYOUTMODE_DRAWABLEAREA); n++;
    apd->printshell = CreatePrintShell(toplevel, apd->pscreen, "Print", args, n);

    n = 0;
    XtSetArg(args[n], XtNresizable,            True);            n++;
    XtSetArg(args[n], XtNright,                XtChainRight);    n++;
    apd->content.form = XtCreateManagedWidget("form", formWidgetClass, apd->printshell, args, n);

    textfont = GetPrintTextFont(pdpy, dpi);

#ifdef PRINT_PAGEHEADER
    n = 0;
    XtSetArg(args[n], XtNfromHoriz,            NULL);            n++;
    XtSetArg(args[n], XtNfromVert,             NULL);            n++;
    XtSetArg(args[n], XtNtop,                  XtChainTop);      n++;
    XtSetArg(args[n], XtNright,                XtChainRight);    n++;
    XtSetArg(args[n], XtNresizable,            True);            n++;
    XtSetArg(args[n], XtNfont,                 textfont);        n++; /* fontset would be better */
    XtSetArg(args[n], XtNlabel,                "Page: n/n");     n++;
    XtSetArg(args[n], XtNjustify,              XtJustifyRight);  n++;
    apd->content.pageheaderlabel = XtCreateManagedWidget("pageinfo", labelWidgetClass, apd->content.form, args, n);
#endif /* PRINT_PAGEHEADER */

    n = 0;
    XtSetArg(args[n], XtNtype,             XawAsciiFile);                 n++;
    XtSetArg(args[n], XtNstring,           viewFileName);                 n++;
    XtSetArg(args[n], XtNscrollHorizontal, XawtextScrollNever);           n++;
    XtSetArg(args[n], XtNscrollVertical,   XawtextScrollNever);           n++;

/* Usually I would expect that using |XtNfromVert, apd->content.pageheaderlabel|
 * would be the correct way to place the text widget with the main content below
 * the page header widget - but for an unknown reason this doesn not work: The
 * text widget squishes itself into the bottom half of the page and only occupies
 * 1/2 of the page's with... ;-(( */
#define WORKAROUND_FOR_SOMETHING_IS_WRONG 1
#ifdef WORKAROUND_FOR_SOMETHING_IS_WRONG
    XtSetArg(args[n], XtNtop,              XtChainTop);                   n++;
    XtSetArg(args[n], XtNright,            XtChainRight);                 n++;
    XtSetArg(args[n], XtNvertDistance,     (textfont->ascent+textfont->descent+2)*2); n++;    
#else
    XtSetArg(args[n], XtNfromHoriz,        NULL);                         n++;
    XtSetArg(args[n], XtNfromVert,         apd->content.pageheaderlabel); n++;
#endif
    XtSetArg(args[n], XtNfont,             textfont);                     n++; /* fontset would be better */
    apd->content.text = XtCreateManagedWidget("text", asciiTextWidgetClass, apd->content.form, args, n);
    /* Disable the caret - that is not needed for printing */
    XawTextDisplayCaret(apd->content.text, False);
    
    XtAddCallback(apd->printshell, XawNpageSetupCallback, PageSetupCB,   (XtPointer)apd);
    XtAddCallback(apd->printshell, XawNendJobCallback,    PrintEndJobCB, (XtPointer)apd);

    /* Realise print shell (which will set position+size of the child
     * widgets based on the current page size) */
    XtRealizeWidget(apd->printshell);
    
    /* Count number of pages in the text widget */
    apd->numpages = CountPages(apd->content.text);

    /* Make sure that the Xt machinery is really using the right screen (assertion) */
    if (XpGetScreenOfContext(XtDisplay(apd->printshell), apd->pcontext) != XtScreen(apd->printshell))
        Error(("Widget's screen != print screen. BAD.\n"));

    apd->isPrinting = True;

    if (toFile) {
        printf("%s: Printing to file '%s'...\n", ProgramName, toFile);
        apd->printtofile_handle = XpuStartJobToFile(pdpy, pcontext, toFile);
        if (!apd->printtofile_handle) {
            perror("XpuStartJobToFile failure");
            apd->isPrinting = False;
            return;
        }
    }
    else
    {
        printf("%s: Printing to printer...\n", ProgramName);
        XpuStartJobToSpooler(pdpy);
    }
}