/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
    Copyright 2000-2022 the Rosegarden development team.
 
    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.
 
    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.  See the file
    COPYING included with this distribution for more information.
*/

#define RG_MODULE_STRING "[NoteFontFactory]"
#define RG_NO_DEBUG_PRINT 1

#include "NoteFontFactory.h"

#include "misc/Debug.h"
#include "misc/Strings.h"
#include "misc/ConfigGroups.h"
#include "base/Exception.h"
#include "gui/widgets/StartupLogo.h"
#include "NoteFont.h"
#include "NoteFontMap.h"
#include "gui/general/ResourceFinder.h"

#include <QSettings>
#include <QApplication>
#include <QDir>
#include <QMessageBox>
#include <QDir>
#include <QString>
#include <QStringList>

#include <algorithm>

namespace Rosegarden
{

// this class is used as a friend of NoteFontFactory so that the ctor can be private
class NoteFontFactoryStatic
{
public:
    NoteFontFactory m_instance;
};
Q_GLOBAL_STATIC(NoteFontFactoryStatic, s_staticInstance)
static NoteFontFactory &instance() { return s_staticInstance()->m_instance; }

std::set<QString>
NoteFontFactory::getFontNames(bool forceRescan)
{
    RG_DEBUG << "getFontNames(): forceRescan = " << forceRescan;

    NoteFontFactory &that = instance();
    QMutexLocker locker(&that.m_mutex);

    if (forceRescan) that.m_fontNames.clear();
    if (!that.m_fontNames.empty()) return that.m_fontNames;

    QSettings settings;
    settings.beginGroup(NotationViewConfigGroup);

    QString fontNameList = "";
    if (!forceRescan) {
        fontNameList = settings.value("notefontlist", "").toString();
    }
    settings.endGroup();

    RG_DEBUG << "getFontNames(): read from cache: " << fontNameList;

    //QStringList names = QStringList::split(",", fontNameList);
#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
    QStringList names = fontNameList.split(",", Qt::SkipEmptyParts);
#else
    QStringList names = fontNameList.split(",", QString::SkipEmptyParts);
#endif

    ResourceFinder rf;

    if (names.empty()) {

        RG_DEBUG << "getFontNames(): No names available, rescanning...";

        QStringList files = rf.getResourceFiles("fonts/mappings", "xml");

        for (QStringList::Iterator i = files.begin(); i != files.end(); ++i) {

            QString filepath = *i;
            QString name = QFileInfo(filepath).baseName();

            try {
                NoteFontMap map(name);
                if (map.ok()) names.append(map.getName());
            } catch (const Exception &e) {
                StartupLogo::hideIfStillThere();
                QMessageBox::critical(nullptr, tr("Rosegarden"), strtoqstr(e.getMessage()));
                throw;
            }
        }
    }

    if (names.empty()) {
        RG_WARNING << "getFontNames(): WARNING: Unable to find any fonts.";
    }

    QString savedNames;

    for (QStringList::const_iterator i = names.constBegin(); i != names.constEnd(); ++i) {
        that.m_fontNames.insert(*i);
        if (i != names.constBegin()) savedNames += ",";
        savedNames += *i;
    }

    settings.beginGroup( NotationViewConfigGroup );
    settings.setValue("notefontlist", savedNames);
    settings.endGroup();

    return that.m_fontNames;
}

std::vector<int>
NoteFontFactory::getAllSizes(const QString &fontName)
{
    NoteFont *font = getFont(fontName, 0);
    if (!font) return std::vector<int>();

    std::set<int> s(font->getSizes());
    std::vector<int> v;
    for (std::set<int>::iterator i = s.begin(); i != s.end(); ++i) {
        v.push_back(*i);
    }

    std::sort(v.begin(), v.end());
    return v;
}

std::vector<int>
NoteFontFactory::getScreenSizes(const QString &fontName)
{
    NoteFont *font = getFont(fontName, 0);
    if (!font) return std::vector<int>();

    std::set<int> s(font->getSizes());
    std::vector<int> v;
    for (std::set<int>::iterator i = s.begin(); i != s.end(); ++i) {
        if (*i <= 16) v.push_back(*i);
    }
    std::sort(v.begin(), v.end());
    return v;
}

NoteFont *
NoteFontFactory::getFont(const QString &fontName, int size)
{
    NoteFontFactory &that = instance();
    QMutexLocker locker(&that.m_mutex);

    std::map<std::pair<QString, int>, NoteFont *>::iterator i =
        that.m_fonts.find(std::pair<QString, int>(fontName, size));

    if (i == that.m_fonts.end()) {
        try {
            NoteFont *font = new NoteFont(fontName, size);
            that.m_fonts[std::pair<QString, int>(fontName, size)] = font;
            return font;
        } catch (const Exception &e) {
            StartupLogo::hideIfStillThere();
            QMessageBox::critical(nullptr, tr("Rosegarden"), strtoqstr(e.getMessage()));
            throw;
        }
    } else {
        return i->second;
    }
}

QString
NoteFontFactory::getDefaultFontName()
{
    static QString defaultFont;
    if (!defaultFont.isEmpty()) return defaultFont;

    std::set<QString> fontNames = getFontNames();

    if (fontNames.find("Feta") != fontNames.end()) {
        defaultFont = "Feta";
    } else {
        fontNames = getFontNames(true);
        if (fontNames.find("Feta") != fontNames.end()) {
            defaultFont = "Feta";
        } else if (!fontNames.empty()) {
            defaultFont = *fontNames.begin();
        } else {
            QString message = tr("Can't obtain a default font -- no fonts found");
            StartupLogo::hideIfStillThere();
            QMessageBox::critical(nullptr, tr("Rosegarden"), message);
            throw NoFontsAvailable(qstrtostr(message));
        }
    }

    return defaultFont;
}

int
NoteFontFactory::getDefaultSize(const QString &fontName)
{
    // always return 8 if it's supported!
    std::vector<int> sizes(getScreenSizes(fontName));
    for (unsigned int i = 0; i < sizes.size(); ++i) {
        if (sizes[i] == 8) return sizes[i];
    }
    return sizes[sizes.size() / 2];
}

int
NoteFontFactory::getDefaultMultiSize(const QString &fontName)
{
    // always return 6 if it's supported!
    std::vector<int> sizes(getScreenSizes(fontName));
    for (unsigned int i = 0; i < sizes.size(); ++i) {
        if (sizes[i] == 6) return sizes[i];
    }
    return sizes[sizes.size() / 2];
}

bool
NoteFontFactory::isAvailableInSize(const QString &fontName, int size)
{
    std::vector<int> sizes(getAllSizes(fontName));
    for (unsigned int i = 0; i < sizes.size(); ++i) {
        if (sizes[i] == size) return true;
    }
    return false;
}

}
