/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * 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/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <osl/diagnose.h>
#include <osl/process.h>
#include <rtl/bootstrap.hxx>
#include "smplmailclient.hxx"
#include "smplmailmsg.hxx"
#include <com/sun/star/system/SimpleMailClientFlags.hpp>
#include <osl/file.hxx>

#define WIN32_LEAN_AND_MEAN
#if defined _MSC_VER
#pragma warning(push, 1)
#endif
#include <windows.h>
#include <mapi.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif

#include <process.h>
#include <vector>

using css::uno::Reference;
using css::uno::Exception;
using css::uno::RuntimeException;
using css::uno::Sequence;
using css::lang::IllegalArgumentException;

using css::system::XSimpleMailClient;
using css::system::XSimpleMailMessage;
using css::system::SimpleMailClientFlags::NO_USER_INTERFACE;
using css::system::SimpleMailClientFlags::NO_LOGON_DIALOG;

typedef std::vector<rtl::OUString> StringList_t;

const rtl::OUString TO("--to");
const rtl::OUString CC("--cc");
const rtl::OUString BCC("--bcc");
const rtl::OUString FROM("--from");
const rtl::OUString SUBJECT("--subject");
const rtl::OUString ATTACH("--attach");
const rtl::OUString FLAG_MAPI_DIALOG("--mapi-dialog");
const rtl::OUString FLAG_MAPI_LOGON_UI("--mapi-logon-ui");

namespace /* private */
{
    /** @internal
        look if an alternative program is configured
        which should be used as senddoc executable */
    rtl::OUString getAlternativeSenddocUrl()
    {
        rtl::OUString altSenddocUrl;
        HKEY hkey;
        LONG lret = RegOpenKeyW(HKEY_CURRENT_USER, L"Software\\LibreOffice\\SendAsEMailClient", &hkey);
        if (lret == ERROR_SUCCESS)
        {
            wchar_t buff[MAX_PATH];
            LONG sz = sizeof(buff);
            lret = RegQueryValueW(hkey, NULL, buff, &sz);
            if (lret == ERROR_SUCCESS)
            {
                osl::FileBase::getFileURLFromSystemPath(reinterpret_cast<const sal_Unicode*>(buff), altSenddocUrl);
            }
            RegCloseKey(hkey);
        }
        return altSenddocUrl;
    }

    /**
        Returns the absolute file Url of the senddoc executable.

        @returns
        the absolute file Url of the senddoc executable. In case
        of an error an empty string will be returned.
    */
    rtl::OUString getSenddocUrl()
    {
        rtl::OUString senddocUrl = getAlternativeSenddocUrl();

        if (senddocUrl.getLength() == 0)
        {
            senddocUrl = rtl::OUString( "$BRAND_BASE_DIR/program/senddoc.exe");
            rtl::Bootstrap::expandMacros(senddocUrl); //TODO: detect failure
        }
        return senddocUrl;
    }

    /**
        Execute Senddoc.exe which a MAPI wrapper.

        @param rCommandArgs
        [in] the arguments to be passed to Senddoc.exe

        @returns
        <TRUE/> on success.
    */
    bool executeSenddoc(const StringList_t& rCommandArgs)
    {
        rtl::OUString senddocUrl = getSenddocUrl();
        if (senddocUrl.getLength() == 0)
            return false;

        oslProcess proc;
        oslProcessError err = osl_Process_E_Unknown;

        /* for efficiency reasons we are using a 'bad' cast here
        as a vector or rtl::OUStrings is nothing else than
        an array of pointers to rtl_uString's */
        err = osl_executeProcess(
            senddocUrl.pData,
            (rtl_uString**)&rCommandArgs[0],
            rCommandArgs.size(),
            osl_Process_WAIT | osl_Process_DETACHED,
            NULL,
            NULL,
            NULL,
            0,
            &proc);

        if (err != osl_Process_E_None)
            return false;

        oslProcessInfo procInfo;
        procInfo.Size = sizeof(oslProcessInfo);
        osl_getProcessInfo(proc, osl_Process_EXITCODE, &procInfo);
        osl_freeProcessHandle(proc);
        return (procInfo.Code == SUCCESS_SUCCESS);
    }
} // namespace private

Reference<XSimpleMailMessage> SAL_CALL CSmplMailClient::createSimpleMailMessage()
    throw (RuntimeException)
{
    return Reference<XSimpleMailMessage>(new CSmplMailMsg());
}

/**
    Assemble a command line for SendDoc.exe out of the members
    of the supplied SimpleMailMessage.

    @param xSimpleMailMessage
    [in] the mail message.

    @param aFlags
    [in] different flags to be used with the simple mail service.

    @param rCommandArgs
    [in|out] a buffer for the command line arguments. The buffer
    is assumed to be empty.

    @throws com::sun::star::lang::IllegalArgumentException
    if an invalid file URL has been detected in the attachment list.
*/
void CSmplMailClient::assembleCommandLine(
    const Reference<XSimpleMailMessage>& xSimpleMailMessage,
    sal_Int32 aFlag, StringList_t& rCommandArgs)
{
    OSL_ENSURE(rCommandArgs.empty(), "Provided command argument buffer not empty");

    rtl::OUString to = xSimpleMailMessage->getRecipient();
    if (to.getLength() > 0)
    {
        rCommandArgs.push_back(TO);
        rCommandArgs.push_back(to);
    }

    Sequence<rtl::OUString> ccRecipients = xSimpleMailMessage->getCcRecipient();
    for (int i = 0; i < ccRecipients.getLength(); i++)
    {
        rCommandArgs.push_back(CC);
        rCommandArgs.push_back(ccRecipients[i]);
    }

    Sequence<rtl::OUString> bccRecipients = xSimpleMailMessage->getBccRecipient();
    for (int i = 0; i < bccRecipients.getLength(); i++)
    {
        rCommandArgs.push_back(BCC);
        rCommandArgs.push_back(bccRecipients[i]);
    }

    rtl::OUString from = xSimpleMailMessage->getOriginator();
    if (from.getLength() > 0)
    {
        rCommandArgs.push_back(FROM);
        rCommandArgs.push_back(from);
    }

    rtl::OUString subject = xSimpleMailMessage->getSubject();
    if (subject.getLength() > 0)
    {
        rCommandArgs.push_back(SUBJECT);
        rCommandArgs.push_back(subject);
    }

    Sequence<rtl::OUString> attachments = xSimpleMailMessage->getAttachement();
    for (int i = 0; i < attachments.getLength(); i++)
    {
        rtl::OUString sysPath;
        osl::FileBase::RC err = osl::FileBase::getSystemPathFromFileURL(attachments[i], sysPath);
        if (err != osl::FileBase::E_None)
            throw IllegalArgumentException(
                rtl::OUString("Invalid attachment file URL"),
                static_cast<XSimpleMailClient*>(this),
                1);

        rCommandArgs.push_back(ATTACH);
        rCommandArgs.push_back(sysPath);
    }

    if (!(aFlag & NO_USER_INTERFACE))
        rCommandArgs.push_back(FLAG_MAPI_DIALOG);

    if (!(aFlag & NO_LOGON_DIALOG))
        rCommandArgs.push_back(FLAG_MAPI_LOGON_UI);
}

void SAL_CALL CSmplMailClient::sendSimpleMailMessage(
    const Reference<XSimpleMailMessage>& xSimpleMailMessage, sal_Int32 aFlag)
    throw (IllegalArgumentException, Exception, RuntimeException)
{
    validateParameter(xSimpleMailMessage, aFlag);

    StringList_t senddocParams;
    assembleCommandLine(xSimpleMailMessage, aFlag, senddocParams);

    if (!executeSenddoc(senddocParams))
        throw Exception(
            rtl::OUString("Send email failed"),
            static_cast<XSimpleMailClient*>(this));
}

void CSmplMailClient::validateParameter(
    const Reference<XSimpleMailMessage>& xSimpleMailMessage, sal_Int32 aFlag )
{
    if (!xSimpleMailMessage.is())
        throw IllegalArgumentException(
            rtl::OUString("Empty mail message reference"),
            static_cast<XSimpleMailClient*>(this),
            1);

    OSL_ENSURE(!(aFlag & NO_LOGON_DIALOG), "Flag NO_LOGON_DIALOG has currently no effect");

    // check the flags, the allowed range is 0 - (2^n - 1)
    if (aFlag < 0 || aFlag > 3)
        throw IllegalArgumentException(
            rtl::OUString("Invalid flag value"),
            static_cast<XSimpleMailClient*>(this),
            2);

    // check if a recipient is specified of the flags NO_USER_INTERFACE is specified
    if ((aFlag & NO_USER_INTERFACE) && !xSimpleMailMessage->getRecipient().getLength())
        throw IllegalArgumentException(
            rtl::OUString("No recipient specified"),
            static_cast<XSimpleMailClient*>(this),
            1);
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */