/* -*- 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/.

 */

#include <vcl/IconThemeInfo.hxx>

#include <rtl/character.hxx>

#include <tools/gen.hxx>

#include <stdexcept>

#include <algorithm>

// constants for theme ids and display names. (The theme id for high contrast is used

// outside of this class and hence made public in IconThemeInfo.)

namespace {

constexpr OUStringLiteral HELPIMG_FAKE_THEME(u"helpimg");

OUString

filename_from_url(std::u16string_view url)

{

    size_t slashPosition = url.rfind( '/' );

    if (slashPosition == std::u16string_view::npos) {

        return OUString();

    }

    OUString filename( url.substr( slashPosition+1 ) );

    return filename;

}

} // end anonymous namespace

namespace vcl {

const sal_Unicode ICON_THEME_PACKAGE_PREFIX[] = u"images_";

const sal_Unicode EXTENSION_FOR_ICON_PACKAGES[] = u".zip";

IconThemeInfo::IconThemeInfo()

{

}

IconThemeInfo::IconThemeInfo(const OUString& urlToFile)

: mUrlToFile(urlToFile)

{

    OUString filename = filename_from_url(urlToFile);

    if (filename.isEmpty()) {

        throw std::runtime_error("invalid URL passed to IconThemeInfo()");

    }

    mThemeId = FileNameToThemeId(filename);

    mDisplayName = ThemeIdToDisplayName(mThemeId);

}

/*static*/ Size

IconThemeInfo::SizeByThemeName(std::u16string_view themeName)

{

   if (themeName == u"galaxy") { //kept for compiler because of unused parameter 'themeName'

     return Size( 26, 26 );

   }

   else {

     return Size( 24, 24 );

   }

}

/*static*/ bool

IconThemeInfo::UrlCanBeParsed(std::u16string_view url)

{

    OUString fname = filename_from_url(url);

    if (fname.isEmpty()) {

        return false;

    }

    if (!fname.startsWithIgnoreAsciiCase(ICON_THEME_PACKAGE_PREFIX)) {

        return false;

    }

    if (!fname.endsWithIgnoreAsciiCase(EXTENSION_FOR_ICON_PACKAGES)) {

        return false;

    }

    if (fname.indexOf(HELPIMG_FAKE_THEME) != -1 ) {

        return false;

    }

    return true;

}

/*static*/ OUString

IconThemeInfo::FileNameToThemeId(std::u16string_view filename)

{

    OUString r;

    size_t positionOfLastDot = filename.rfind(EXTENSION_FOR_ICON_PACKAGES);

    if (positionOfLastDot == std::u16string_view::npos) { // means index not found

        throw std::runtime_error("IconThemeInfo::FileNameToThemeId() called with invalid filename.");

    }

    size_t positionOfFirstUnderscore = filename.find(ICON_THEME_PACKAGE_PREFIX);

    if (positionOfFirstUnderscore == std::u16string_view::npos) { // means index not found. Use the whole name instead

        throw std::runtime_error("IconThemeInfo::FileNameToThemeId() called with invalid filename.");

    }

    positionOfFirstUnderscore += RTL_CONSTASCII_LENGTH(ICON_THEME_PACKAGE_PREFIX);

    r = filename.substr(positionOfFirstUnderscore, positionOfLastDot - positionOfFirstUnderscore);

    return r;

}

/*static*/ OUString

IconThemeInfo::ThemeIdToDisplayName(const OUString& themeId)

{

    if (themeId.isEmpty()) {

        throw std::runtime_error("IconThemeInfo::ThemeIdToDisplayName() called with invalid id.");

    }

    // Strip _svg and _dark filename "extensions"

    OUString aDisplayName = themeId;

    bool bIsSvg = aDisplayName.endsWith("_svg", &aDisplayName);

    bool bIsDark = aDisplayName.endsWith("_dark", &aDisplayName);

    if (!bIsSvg && bIsDark)

        bIsSvg = aDisplayName.endsWith("_svg", &aDisplayName);

    // make the first letter uppercase

    sal_Unicode firstLetter = aDisplayName[0];

    if (rtl::isAsciiLowerCase(firstLetter))

    {

        aDisplayName = OUStringChar(sal_Unicode(rtl::toAsciiUpperCase(firstLetter))) + aDisplayName.subView(1);

    }

    // replacing underscores with spaces of multi words pack name.

    aDisplayName = aDisplayName.replace('_', ' ');

    if (bIsSvg && bIsDark)

        aDisplayName += " (SVG + dark)";

    else if (bIsSvg)

        aDisplayName += " (SVG)";

    else if (bIsDark)

        aDisplayName += " (dark)";

    return aDisplayName;

}

namespace

{

    class SameTheme

    {

    private:

        const OUString& m_rThemeId;

    public:

        explicit SameTheme(const OUString &rThemeId) : m_rThemeId(rThemeId) {}

        bool operator()(const vcl::IconThemeInfo &rInfo)

        {

            return m_rThemeId == rInfo.GetThemeId();

        }

    };

}

/*static*/ const vcl::IconThemeInfo&

IconThemeInfo::FindIconThemeById(const std::vector<vcl::IconThemeInfo>& themes, const OUString& themeId)

{

    std::vector<vcl::IconThemeInfo>::const_iterator it = std::find_if(themes.begin(), themes.end(),

               SameTheme(themeId));

    if (it == themes.end())

    {

        throw std::runtime_error("Could not find theme id in theme vector.");

    }

    return *it;

}

/*static*/ bool

IconThemeInfo::IconThemeIsInVector(const std::vector<vcl::IconThemeInfo>& themes, const OUString& themeId)

{

    return std::any_of(themes.begin(), themes.end(), SameTheme(themeId));

}

} // end namespace vcl

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