/* -*- 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 .
 */


/**************************************************************************
                                TODO
 **************************************************************************

 *************************************************************************/

#include <sal/config.h>

#include <string_view>

#include <comphelper/storagehelper.hxx>

#include "../inc/urihelper.hxx"

#include "pkguri.hxx"

using namespace package_ucp;


// PackageUri Implementation.


static void normalize( OUString& rURL )
{
    sal_Int32 nPos = 0;
    do
    {
        nPos = rURL.indexOf( '%', nPos );
        if ( nPos != -1 )
        {
            if ( nPos < ( rURL.getLength() - 2 ) )
            {
                OUString aTmp = rURL.copy( nPos + 1, 2 );
                rURL = rURL.replaceAt( nPos + 1, 2, aTmp.toAsciiUpperCase() );
                nPos++;
            }
        }
    }
    while ( nPos != -1 );
}


void PackageUri::init() const
{
    // Already inited?
    if ( m_aUri.isEmpty() || !m_aPath.isEmpty() )
        return;

    // Note: Maybe it's a re-init, setUri only resets m_aPath!
    m_aPackage.clear();
    m_aParentUri.clear();
    m_aName.clear();
    m_aParam.clear();
    m_aScheme.clear();

    // URI must match at least: <scheme>://<non_empty_url_to_file>
    if ( m_aUri.getLength() < PACKAGE_URL_SCHEME_LENGTH + 4 )
    {
        // error, but remember that we did an init().
        m_aPath = "/";
        return;
    }

    // Scheme must be followed by '://'
    if ( ( m_aUri[ PACKAGE_URL_SCHEME_LENGTH ] != ':' )
         ||
         ( m_aUri[ PACKAGE_URL_SCHEME_LENGTH + 1 ] != '/' )
         ||
         ( m_aUri[ PACKAGE_URL_SCHEME_LENGTH + 2 ] != '/' ) )
    {
        // error, but remember that we did an init().
        m_aPath = "/";
        return;
    }

    OUString aPureUri;
    sal_Int32 nParam = m_aUri.indexOf( '?' );
    if( nParam >= 0 )
    {
        m_aParam = m_aUri.copy( nParam );
        aPureUri = m_aUri.copy( 0, nParam );
    }
    else
        aPureUri = m_aUri;

    // Scheme is case insensitive.
    m_aScheme = aPureUri.copy(
        0, PACKAGE_URL_SCHEME_LENGTH ).toAsciiLowerCase();

    if ( m_aScheme == PACKAGE_URL_SCHEME || m_aScheme == PACKAGE_ZIP_URL_SCHEME )
    {
        if ( m_aScheme == PACKAGE_ZIP_URL_SCHEME )
        {
            m_aParam +=
                ( !m_aParam.isEmpty()
                  ? std::u16string_view( u"&purezip" )
                  : std::u16string_view( u"?purezip" ) );
        }

        aPureUri = aPureUri.replaceAt( 0,
                                       m_aScheme.getLength(),
                                       m_aScheme );

        sal_Int32 nStart = PACKAGE_URL_SCHEME_LENGTH + 3;
        sal_Int32 nEnd   = aPureUri.lastIndexOf( '/' );
        if ( nEnd == PACKAGE_URL_SCHEME_LENGTH + 3 )
        {
            // Only <scheme>:/// - Empty authority

            // error, but remember that we did an init().
            m_aPath = "/";
            return;
        }
        else if ( nEnd == ( aPureUri.getLength() - 1 ) )
        {
            if ( aPureUri[ aPureUri.getLength() - 2 ] == '/' )
            {
                // Only <scheme>://// or <scheme>://<something>

                // error, but remember that we did an init().
                m_aPath = "/";
                return;
            }

            // Remove trailing slash.
            aPureUri = aPureUri.copy( 0, nEnd );
        }


        nEnd = aPureUri.indexOf( '/', nStart );
        if ( nEnd == -1 )
        {
            // root folder.

            OUString aNormPackage = aPureUri.copy( nStart );
            normalize( aNormPackage );

            aPureUri = aPureUri.replaceAt(
                nStart, aPureUri.getLength() - nStart, aNormPackage );
            m_aPackage
                = ::ucb_impl::urihelper::decodeSegment( aNormPackage );
            m_aPath = "/";
            m_aUri = m_aUri.replaceAt( 0,
                                       ( nParam >= 0 )
                                       ? nParam
                                       : m_aUri.getLength(), aPureUri );

            sal_Int32 nLastSlash = m_aPackage.lastIndexOf( '/' );
            if ( nLastSlash != -1 )
                m_aName = ::ucb_impl::urihelper::decodeSegment(
                    m_aPackage.copy( nLastSlash + 1 ) );
            else
                m_aName
                    = ::ucb_impl::urihelper::decodeSegment( m_aPackage );
        }
        else
        {
            m_aPath = aPureUri.copy( nEnd + 1 );

            // Unexpected sequences of characters:
            // - empty path segments
            // - encoded slashes
            // - parent folder segments ".."
            // - current folder segments "."
            if ( m_aPath.indexOf( "//" ) != -1
              || m_aPath.indexOf( "%2F" ) != -1
              || m_aPath.indexOf( "%2f" ) != -1
              || ::comphelper::OStorageHelper::PathHasSegment( m_aPath, u".." )
              || ::comphelper::OStorageHelper::PathHasSegment( m_aPath, u"." ) )
            {
                // error, but remember that we did an init().
                m_aPath = "/";
                return;
            }

            OUString aNormPackage = aPureUri.copy( nStart, nEnd - nStart );
            normalize( aNormPackage );

            aPureUri = aPureUri.replaceAt(
                nStart, nEnd - nStart, aNormPackage );
            aPureUri = aPureUri.replaceAt(
                nEnd + 1,
                aPureUri.getLength() - nEnd - 1,
                ::ucb_impl::urihelper::encodeURI( m_aPath ) );

            m_aPackage
                = ::ucb_impl::urihelper::decodeSegment( aNormPackage );
            m_aPath = ::ucb_impl::urihelper::decodeSegment( m_aPath );
            m_aUri = m_aUri.replaceAt( 0,
                                       ( nParam >= 0 )
                                       ? nParam
                                       : m_aUri.getLength(), aPureUri );

            sal_Int32 nLastSlash = aPureUri.lastIndexOf( '/' );
            if ( nLastSlash != -1 )
            {
                m_aParentUri = aPureUri.copy( 0, nLastSlash );
                m_aName = ::ucb_impl::urihelper::decodeSegment(
                    aPureUri.copy( nLastSlash + 1 ) );
            }
        }

        // success
        m_bValid = true;
    }
    else
    {
        // error, but remember that we did an init().
        m_aPath = "/";
    }

}

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