/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* ex: set tabstop=8 softtabstop=4 shiftwidth=4 expandtab: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nscore.h"

#include "nsCUPSShim.h"

#include "nsIServiceManager.h"

#include "nsPSPrinters.h"

#include "nsReadableUtils.h"        // StringBeginsWith()

#include "nsCUPSShim.h"

#include "mozilla/Preferences.h"

#include "prlink.h"

#include "prenv.h"

#include "plstr.h"

using namespace mozilla;

#define NS_CUPS_PRINTER "CUPS/"

#define NS_CUPS_PRINTER_LEN (sizeof(NS_CUPS_PRINTER) - 1)

/* dummy printer name for the gfx/src/ps driver */

#define NS_POSTSCRIPT_DRIVER_NAME "PostScript/"

nsCUPSShim gCupsShim;

nsPSPrinterList::nsPSPrinterList()

{

    // Should we try cups?

    if (Preferences::GetBool("print.postscript.cups.enabled", true) &&

        !gCupsShim.IsInitialized()) {

        gCupsShim.Init();

    }

}

/* Check whether the PostScript module has been disabled at runtime */

bool

nsPSPrinterList::Enabled()

{

    const char *val = PR_GetEnv("MOZILLA_POSTSCRIPT_ENABLED");

    if (val && (val[0] == '0' || !PL_strcasecmp(val, "false")))

        return false;

    // is the PS module enabled?

    return Preferences::GetBool("print.postscript.enabled", true);

}

/* Fetch a list of printers handled by the PostsScript module */

void

nsPSPrinterList::GetPrinterList(nsTArray<nsCString>& aList)

{

    aList.Clear();

    // Query CUPS for a printer list. The default printer goes to the

    // head of the output list; others are appended.

    if (gCupsShim.IsInitialized()) {

        cups_dest_t *dests;

        int num_dests = (gCupsShim.mCupsGetDests)(&dests);

        if (num_dests) {

            for (int i = 0; i < num_dests; i++) {

                nsAutoCString fullName(NS_CUPS_PRINTER);

                fullName.Append(dests[i].name);

                if (dests[i].instance != nullptr) {

                    fullName.Append('/');

                    fullName.Append(dests[i].instance);

                }

                if (dests[i].is_default)

                    aList.InsertElementAt(0, fullName);

                else

                    aList.AppendElement(fullName);

            }

        }

        (gCupsShim.mCupsFreeDests)(num_dests, dests);

    }

    // Build the "classic" list of printers -- those accessed by running

    // an opaque command. This list always contains a printer named "default".

    // In addition, we look for either an environment variable

    // MOZILLA_POSTSCRIPT_PRINTER_LIST or a preference setting

    // print.printer_list, which contains a space-separated list of printer

    // names.

    aList.AppendElement(

            NS_LITERAL_CSTRING(NS_POSTSCRIPT_DRIVER_NAME "default"));

    nsAutoCString list(PR_GetEnv("MOZILLA_POSTSCRIPT_PRINTER_LIST"));

    if (list.IsEmpty()) {

        Preferences::GetCString("print.printer_list", list);

    }

    if (!list.IsEmpty()) {

        // For each printer (except "default" which was already added),

        // construct a string "PostScript/<name>" and append it to the list.

        char *state;

        for (char *name = PL_strtok_r(list.BeginWriting(), " ", &state);

                nullptr != name;

                name = PL_strtok_r(nullptr, " ", &state)

        ) {

            if (0 != strcmp(name, "default")) {

                nsAutoCString fullName(NS_POSTSCRIPT_DRIVER_NAME);

                fullName.Append(name);

                aList.AppendElement(fullName);

            }

        }

    }

}

/* Identify the printer type */

nsPSPrinterList::PrinterType

nsPSPrinterList::GetPrinterType(const nsACString& aName)

{

    if (StringBeginsWith(aName, NS_LITERAL_CSTRING(NS_POSTSCRIPT_DRIVER_NAME)))

        return kTypePS;

    else if (StringBeginsWith(aName, NS_LITERAL_CSTRING(NS_CUPS_PRINTER)))

        return kTypeCUPS;

    else

        return kTypeUnknown;

}