/* Glimmer : print-util.c . Utility functions for printing.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 *(at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * Authors:
 *   Chema Celorio <chema@celorio.com>
 *   Chris Phelps <chicane@renient.com>
 */

#include <config.h>
#include <gnome.h>
#include <libgnomeprint/gnome-print.h>

#include "print-util.h"

/* Taken from gnumeric */
/**
 * g_unichar_to_utf8:
 * @c: a ISO10646 character code
 * @outbuf: output buffer, must have at least 6 bytes of space.
 *       If %NULL, the length will be computed and returned
 *       and nothing will be written to @out.
 * 
 * Convert a single character to utf8
 * 
 * Return value: number of bytes written
 **/
static int
g_unichar_to_utf8 (gint c, gchar * outbuf)
{
    size_t len = 0;
    int first;
    int i;

    if (c < 0x80) {
        first = 0;
        len = 1;
    } else if (c < 0x800) {
        first = 0xc0;
        len = 2;
    } else if (c < 0x10000) {
        first = 0xe0;
        len = 3;
    } else if (c < 0x200000) {
        first = 0xf0;
        len = 4;
    } else if (c < 0x4000000) {
        first = 0xf8;
        len = 5;
    } else {
        first = 0xfc;
        len = 6;
    }

    if (outbuf) {
        for (i = len - 1; i > 0; --i) {
            outbuf[i] = (c & 0x3f) | 0x80;
            c >>= 6;
        }
        outbuf[0] = c | first;
    }

    return len;
}


/*
 * print_show_iso8859_1
 *
 * Like gnome_print_show, but expects an ISO 8859.1 string.
 *
 * NOTE: This function got introduced when gnome-print switched to UTF-8,
 * and will disappear again once Gnumeric makes the switch. Deprecated at
 * birth! 
 */
int
glimmer_print_show_iso8859_1 (GnomePrintContext * pc, char const *text)
{
    gchar *p, *utf, *udyn, ubuf[4096];
    gint len, ret, i;

    g_return_val_if_fail (pc && text, -1);

    if (!*text)
        return 0;

    /* We need only length * 2, because iso-8859-1 is encoded in 1-2 bytes */
    len = strlen (text);
    if (len * 2 > sizeof (ubuf)) {
        udyn = g_new (gchar, len * 2);
        utf = udyn;
    } else {
        udyn = NULL;
        utf = ubuf;
    }
    p = utf;

    for (i = 0; i < len; i++) {
        p += g_unichar_to_utf8 (((guchar *) text)[i], p);
    }

    ret = gnome_print_show_sized (pc, utf, p - utf);

    if (udyn)
        g_free (udyn);

    return ret;
}


/**
 * glimmer_print_verify_fonts:
 * @void: 
 * 
 * verify that the fonts that we are going to use are available
 * 
 * Return Value: 
 **/
gboolean
glimmer_print_verify_fonts (void)
{
    GnomeFont *test_font;
    guchar *test_font_name;

    /* Courier */
    test_font_name = g_strdup (general_preferences.print_font);
    test_font = gnome_font_new_from_full_name (test_font_name);
    if (!test_font) {
        gchar *errstr =
            g_strdup_printf (_
                             ("Glimmer could not find the font \"%s\".\nGlimmer is unable to print without this font installed."),
                             test_font_name);
        g_free (errstr);
        return FALSE;
    }
    gnome_font_unref (test_font);
    g_free (test_font_name);
    return TRUE;
}


static void
glimmer_print_progress_clicked (GtkWidget * button, gpointer data)
{
    PrintJobInfo *pji = (PrintJobInfo *) data;

    if (pji->progress_dialog == NULL)
        return;
    pji->canceled = TRUE;
}

void
glimmer_print_progress_start (PrintJobInfo * pji)
{
    GnomeDialog *dialog;
    GtkWidget *label;
    GtkWidget *progress_bar;

    /* For small docs, the dialog looks lame */
    if (pji->page_last - pji->page_first < 3)
        return;

    progress_bar = gtk_progress_bar_new ();

    dialog = GNOME_DIALOG (gnome_dialog_new (_("Printing .."),
                                             GNOME_STOCK_BUTTON_CANCEL, NULL));

    gnome_dialog_button_connect (dialog, 0,
                                 GTK_SIGNAL_FUNC
                                 (glimmer_print_progress_clicked), pji);

    pji->progress_dialog = dialog;
    pji->progress_bar = progress_bar;

    label = gtk_label_new (_("Printing ..."));

    gtk_box_pack_start (GTK_BOX (dialog->vbox), label, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (dialog->vbox), progress_bar, FALSE, FALSE, 0);
    gtk_widget_show_all (GTK_WIDGET (dialog));
}

void
glimmer_print_progress_tick (PrintJobInfo * pji, gint page)
{
    gfloat percentage;

    while (gtk_events_pending ())
        gtk_main_iteration ();

    if (!pji->progress_dialog)
        return;
    percentage =
        (gfloat) (page - pji->page_first) / (gfloat) (pji->page_last -
                                                      pji->page_first);

    if (percentage > 0.0 && percentage < 1.0)
        gtk_progress_set_percentage (GTK_PROGRESS (pji->progress_bar),
                                     percentage);
}

void
glimmer_print_progress_end (PrintJobInfo * pji)
{
    if (!pji->progress_dialog)
        return;
    gnome_dialog_close (pji->progress_dialog);
    pji->progress_dialog = NULL;
    pji->progress_bar = NULL;
}