//=============================================================================
//  MuseScore
//  Linux Music Score Editor
//
//  Copyright (C) 2013 Werner Schweer and others
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License version 2.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//=============================================================================

//    CapXML import filter
//    Supports the CapXML 1.0 file format version 1.0.8 (capella 2008)
//    The implementation shares as much code as possible with the capella
//    (.cap) importer (capella.cpp and capella.h)
//    If statements in the parser match the element order in the schema definition

#include <assert.h>
#include <cmath>

#include "libmscore/score.h"
#include "thirdparty/qzip/qzipreader_p.h"
#include "capella.h"

namespace Ms {
//---------------------------------------------------------
//   capxReadFont
//---------------------------------------------------------

static QFont capxReadFont(XmlReader& e)
{
    QFont f;
    QString family = e.attribute("face");
    if (family != "") {
        f.setFamily(family);
    }
    qreal pointSize = e.doubleAttribute("height", 0);
    if (pointSize > 0.5) {
        f.setPointSizeF(pointSize);
    }
    int weight = e.intAttribute("weight");
    if (weight < 200) {
        f.setWeight(QFont::Light);
    } else if (weight < 550) {
        f.setWeight(QFont::Normal);
    } else {
        f.setWeight(QFont::Bold);
    }
    f.setItalic(e.attribute("italic", "false") == "true");
    // qDebug("capxReadFont family '%s' ps %g w %d it '%s'", qPrintable(family), pointSize, weight, qPrintable(italic));
    e.readNext();
    return f;
}

//---------------------------------------------------------
//   qstring2timestep -- convert string to TIMESTEP
//---------------------------------------------------------

static bool qstring2timestep(QString& str, TIMESTEP& tstp)
{
    if (str == "1/1") {
        tstp = TIMESTEP::D1;
        return true;
    } else if (str == "1/2") {
        tstp = TIMESTEP::D2;
        return true;
    } else if (str == "1/4") {
        tstp = TIMESTEP::D4;
        return true;
    } else if (str == "1/8") {
        tstp = TIMESTEP::D8;
        return true;
    } else if (str == "1/16") {
        tstp = TIMESTEP::D16;
        return true;
    } else if (str == "1/32") {
        tstp = TIMESTEP::D32;
        return true;
    } else if (str == "1/64") {
        tstp = TIMESTEP::D64;
        return true;
    } else if (str == "1/128") {
        tstp = TIMESTEP::D128;
        return true;
    } else if (str == "2/1") {
        tstp = TIMESTEP::D_BREVE;
        return true;
    }
    return false;
}

//---------------------------------------------------------
//   BasicDrawObj::readCapx -- capx equivalent of BasicDrawObj::read
//---------------------------------------------------------

void BasicDrawObj::readCapx(XmlReader& e)
{
    nNotes = e.intAttribute("noteRange", 0);
    qDebug("nNotes %d", nNotes);
    e.readNext();
}

//---------------------------------------------------------
//   BasicDurationalObj::readCapxDisplay -- capx equivalent of BasicDurationalObj::read
//   reads the <display> element only
//---------------------------------------------------------

void BasicDurationalObj::readCapxDisplay(XmlReader& e)
{
    invisible = e.attribute("invisible") == "true";
    e.readNext();
}

//---------------------------------------------------------
//   BasicDurationalObj::readCapx -- capx equivalent of BasicDurationalObj::read
//---------------------------------------------------------

void BasicDurationalObj::readCapx(XmlReader& e, unsigned int& fullm)
{
    nDots      = 0;
    noDuration = false;
    postGrace  = false;
    bSmall     = false;
    invisible  = false;
    notBlack   = false;
    color = Qt::black;
    t = TIMESTEP::D1;
    horizontalShift = 0;
    count = 0;
    tripartite   = 0;
    isProlonging = 0;
    QString base = e.attribute("base");
    bool res = false;
    // try to convert base to timestep ("first pattern")
    res = qstring2timestep(base, t);
    if (!res) {
        // try multi-measure rest ("second pattern")
        int i = base.toInt();
        if (i > 0) {
            fullm = i;
        } else {
            qDebug("BasicDurationalObj::readCapx: invalid base: '%s'", qPrintable(base));
        }
    }
    nDots = e.intAttribute("dots", 0);
    noDuration = e.attribute("noDuration", "false") == "true";
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "tuplet") {
            count = e.attribute("count").toInt();
            tripartite = e.attribute("tripartite", "false") == "true";
            isProlonging = e.attribute("prolong", "false") == "true";
            e.readNext();
        } else {
            e.unknown();
        }
    }
    qDebug("DurationObj ndots %d nodur %d postgr %d bsm %d inv %d notbl %d t %d hsh %d cnt %d trp %d ispro %d fullm %d",
           nDots, noDuration, postGrace, bSmall, invisible, notBlack, int(t), horizontalShift, count, tripartite,
           isProlonging, fullm
           );
}

//---------------------------------------------------------
//   BasicDurationalObj::readCapxObjectArray
//---------------------------------------------------------

void BasicDurationalObj::readCapxObjectArray(XmlReader& e)
{
    objects = cap->readCapxDrawObjectArray(e);
}

//---------------------------------------------------------
//   CapExplicitBarline::readCapx -- capx equivalent of CapExplicitBarline::read
//---------------------------------------------------------

void CapExplicitBarline::readCapx(XmlReader& e)
{
    QString type = e.attribute("type", "single");
    if (type == "single") {
        _type = BarLineType::NORMAL;
    } else if (type == "double") {
        _type = BarLineType::DOUBLE;
    } else if (type == "end") {
        _type = BarLineType::END;
    } else if (type == "repEnd") {
        _type = BarLineType::END_REPEAT;
    } else if (type == "repBegin") {
        _type = BarLineType::START_REPEAT;
    } else if (type == "repEndBegin") {
        _type = BarLineType::END_START_REPEAT;
    } else if (type == "dashed") {
        _type = BarLineType::BROKEN;
    } else {
        _type = BarLineType::NORMAL;    // default
    }
    _barMode = 0;
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "drawObjects") {
            e.skipCurrentElement();
        } else {
            e.unknown();
        }
    }
    e.readNext();
}

//---------------------------------------------------------
//   CapClef::readCapx -- capx equivalent of CapClef::read
//---------------------------------------------------------

void CapClef::readCapx(XmlReader& e)
{
    QString clef = e.attribute("clef");
    if (clef == "G2-") {
        form = Form::G;
        line = ClefLine::L2;
        oct = Oct::OCT_BASSA;
    } else if (clef == "treble") {
        form = Form::G;
        line = ClefLine::L2;
        oct = Oct::OCT_NULL;
    } else if (clef == "bass") {
        form = Form::F;
        line = ClefLine::L4;
        oct = Oct::OCT_NULL;
    } else {
        /* default */
        form = Form::G;
        line = ClefLine::L2;
        oct = Oct::OCT_NULL;
    }
    qDebug("Clef::read '%s' -> form %d line %d oct %d", qPrintable(clef), int(form), int(line), int(oct));
    e.readNext();
}

//---------------------------------------------------------
//   CapKey::readCapx -- capx equivalent of CapKey::read
//---------------------------------------------------------

void CapKey::readCapx(XmlReader& e)
{
    signature = e.intAttribute("fifths", 0);
    qDebug("Key %d", signature);
    e.readNext();
}

//---------------------------------------------------------
//   qstring2timesig -- convert string to timesig
//   return true on success
//---------------------------------------------------------

static void qstring2timesig(QString& time, uchar& numerator, int& log2Denom, bool& allaBreve)
{
    bool res = true;
    numerator = 4;
    log2Denom = 2;
    allaBreve = false;                                 // set default
    if (time == "allaBreve") {
        numerator = 2;
        log2Denom = 1;
        allaBreve = true;
    } else if (time == "longAllaBreve") {
        numerator = 4;
        log2Denom = 1;
        allaBreve = true;
    } else if (time == "C") {
        numerator = 4;
        log2Denom = 2;
        allaBreve = false;
    } else if (time == "infinite") {
        qDebug("Meter infinite");
    }                                                            // not supported by MuseScore ?
    else {
        QStringList splitTime = time.split("/");
        if (splitTime.size() == 2) {
            numerator = splitTime.at(0).toInt();
            QString denom = splitTime.at(1);
            if (denom == "1") {
                log2Denom = 0;
            } else if (denom == "2") {
                log2Denom = 1;
            } else if (denom == "4") {
                log2Denom = 2;
            } else if (denom == "8") {
                log2Denom = 3;
            } else if (denom == "16") {
                log2Denom = 4;
            } else if (denom == "32") {
                log2Denom = 5;
            } else if (denom == "64") {
                log2Denom = 6;
            } else if (denom == "128") {
                log2Denom = 7;
            } else {
                res = false;
            }
        } else {
            res = false;
        }
    }
    // TODO: recovery required if decoding the timesig failed ?
    qDebug("Meter '%s' res %d %d/%d allaBreve %d", qPrintable(time), res, numerator, log2Denom, allaBreve);
}

//---------------------------------------------------------
//   CapMeter::readCapx -- capx equivalent of CapMeter::read
//---------------------------------------------------------

void CapMeter::readCapx(XmlReader& e)
{
    qDebug("CapMeter::readCapx");
    QString time = e.attribute("time");
    qstring2timesig(time, numerator, log2Denom, allaBreve);
    e.readNext();
}

//---------------------------------------------------------
//   ChordObj::readCapxStem -- read <stem> element
//---------------------------------------------------------

void ChordObj::readCapxStem(XmlReader& e)
{
    QString dir = e.attribute("dir");
    if (dir == "up") {
        stemDir = StemDir::UP;
    } else if (dir == "down") {
        stemDir = StemDir::DOWN;
    } else if (dir == "none") {
        stemDir = StemDir::NONE;
    }
    e.readNext();
}

//---------------------------------------------------------
//   ChordObj::readCapxArticulation -- read <articulation> element
//---------------------------------------------------------

void ChordObj::readCapxArticulation(XmlReader& e)
{
    QString art = e.attribute("type");
    if (art == "staccato") {
        articulation = 1;
    } else if (art == "tenuto") {
        articulation = 2;
    } else if (art == "staccato tenuto") {
        articulation = 3;
    } else if (art == "staccatissimo") {
        articulation = 4;
    } else if (art == "normalAccent") {
        articulation = 5;
    } else if (art == "strongAccent") {
        articulation = 6;
    } else if (art == "weakBeat") {
        articulation = 7;
    } else if (art == "strongBeat") {
        articulation = 8;
    } else {
        articulation = 0;
    }
    e.readNext();
}

//---------------------------------------------------------
//   ChordObj::readCapx -- capx equivalent of ChordObj::read
//---------------------------------------------------------

void ChordObj::readCapx(XmlReader& e)
{
    stemDir      = StemDir::AUTO;
    dStemLength  = 0;
    nTremoloBars = 0;
    articulation = 0;
    leftTie      = false;
    rightTie     = false;
    beamShift    = 0;
    beamSlope    = 0;
    beamMode      = BeamMode::AUTO;
    notationStave = 0;

    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "duration") {
            unsigned int dummy;
            BasicDurationalObj::readCapx(e, dummy);
        } else if (tag == "display") {
            BasicDurationalObj::readCapxDisplay(e);
        } else if (tag == "stem") {
            readCapxStem(e);
        } else if (tag == "beam") {
            qDebug("ChordObj::readCapx: found beam (skipping)");
            e.skipCurrentElement();
        } else if (tag == "articulation") {
            readCapxArticulation(e);
        } else if (tag == "lyric") {
            readCapxLyrics(e);
        } else if (tag == "drawObjects") {
            readCapxObjectArray(e);
        } else if (tag == "heads") {
            readCapxNotes(e);
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   pitchStr2Char -- convert pitch string ("[A-G][0-9]") to signed char
//   notes:
//   - in .capx middle C is called C5 (which is C4 in MusicXML)
//   - middle C is MIDI note number 60
//   - in .cap, pitch contains the diatonic note number relative to clef and key
//   - as .capx contains absolute notes, store the MIDI note number instead
//---------------------------------------------------------

static signed char pitchStr2Char(QString& strPitch)
{
    QRegExp pitchRegExp("[A-G][0-9]");

    if (!pitchRegExp.exactMatch(strPitch)) {
        qDebug("pitchStr2Char: illegal pitch '%s'", qPrintable(strPitch));
        return 0;
    }

    QString steps("C.D.EF.G.A.B");
    int istep  = steps.indexOf(strPitch.left(1));
    int octave = strPitch.right(1).toInt();
    int pitch  = istep + 12 * octave;

    if (pitch < 0) {
        pitch = -1;
    }
    if (pitch > 127) {
        pitch = -1;
    }

    qDebug("pitchStr2Char: '%s' -> %d", qPrintable(strPitch), pitch);

    return static_cast<signed char>(pitch);
}

//---------------------------------------------------------
//   ChordObj::readCapxLyrics -- read the lyrics in a capx chord
//---------------------------------------------------------

void ChordObj::readCapxLyrics(XmlReader& e)
{
    while (e.readNextStartElement()) {
        if (e.name() == "verse") {
            Verse v;
            v.leftAlign = true;              // not used by capella.cpp
            v.extender  = false;             // not used by capella.cpp
            v.hyphen    = e.attribute("hyphen") == "true";
            v.num       = e.intAttribute("i", 0);
            v.verseNumber = e.attribute("verseNumber");       // not used by capella.cpp
            v.text = e.readElementText();
            verse.append(v);
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   ChordObj::readCapxNotes -- read the notes in a capx chord
//---------------------------------------------------------

void ChordObj::readCapxNotes(XmlReader& e)
{
    while (e.readNextStartElement()) {
        if (e.name() == "head") {
            QString pitch = e.attribute("pitch");
            QString sstep;
            while (e.readNextStartElement()) {
                const QStringRef& tag(e.name());
                if (tag == "alter") {
                    sstep = e.attribute("step");
                    e.readNext();
                } else if (tag == "tie") {
                    rightTie = e.attribute("begin") == "true";
                    e.readNext();
                } else {
                    e.unknown();
                }
            }
            qDebug("ChordObj::readCapxNotes: pitch '%s' altstep '%s'",
                   qPrintable(pitch), qPrintable(sstep));
            int istep = sstep.toInt();
            CNote n;
            n.pitch = pitchStr2Char(pitch);
            n.explAlteration = 0;
            n.headType = 0;
            n.alteration = istep;
            n.silent = 0;
            notes.append(n);
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   RestObj::readCapx -- capx equivalent of RestObj::read
//---------------------------------------------------------

void RestObj::readCapx(XmlReader& e)
{
    bVerticalCentered = false;
    fullMeasures = 0;
    vertShift    = 0;
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "duration") {
            BasicDurationalObj::readCapx(e, fullMeasures);
        } else if (tag == "display") {
            BasicDurationalObj::readCapxDisplay(e);
        } else if (tag == "verticalPos") {
            qDebug("RestObj::readCapx: found verticalPos (skipping)");
            e.skipCurrentElement();
        } else if (tag == "drawObjects") {
            readCapxObjectArray(e);
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   SimpleTextObj::readCapx -- capx equivalent of SimpleTextObj::read
//---------------------------------------------------------

void SimpleTextObj::readCapx(XmlReader& e)
{
    double x = e.doubleAttribute("x");
    double y = e.doubleAttribute("y");
    QString stralign = e.attribute("align", "left");
    align = 0;
    if (stralign == "center") {
        align = 1;
    } else if (stralign == "right") {
        align = 2;
    }
    relPos = QPointF(x, y);
    relPos *= 32.0;
    // qDebug("x %g y %g align %s", x, y, qPrintable(align));
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "font") {
            _font = capxReadFont(e);
        } else if (tag == "content") {
            _text = e.readElementText();
            // qDebug("SimpleTextObj::readCapx: found content '%s'", qPrintable(_text));
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   TransposableObj::readCapx -- capx equivalent of TransposableObj::read
//---------------------------------------------------------

void TransposableObj::readCapx(XmlReader& e)
{
    QString enharmonicNote = e.attribute("base");
    while (e.readNextStartElement()) {
        const QStringRef& tag1(e.name());
        if (tag1 == "drawObj") {
            if (e.attribute("base") == enharmonicNote) {
                while (e.readNextStartElement()) {
                    const QStringRef& tag2(e.name());
                    if (tag2 == "group") {
                        variants.append(cap->readCapxDrawObjectArray(e));
                    }
                }
            } else {
                e.skipCurrentElement();
            }
        }
    }
}

//---------------------------------------------------------
//   SlurObj::readCapx -- capx equivalent of SlurObj::read
//---------------------------------------------------------

void SlurObj::readCapx(XmlReader& e)
{
    // nothing to be done yet
    e.skipCurrentElement();
}

//---------------------------------------------------------
//   VoltaObj::readCapx -- capx equivalent of VoltaObj::read
//---------------------------------------------------------

void VoltaObj::readCapx(XmlReader& e)
{
    bLeft           = e.attribute("leftBent", "true") == "true";
    bRight          = e.attribute("rightBent", "true") == "true";
    bDotted         = e.attribute("dotted", "false") == "true";
    allNumbers      = e.attribute("allNumbers", "false") == "true";
    int firstNumber = e.intAttribute("firstNumber", 0);
    int lastNumber  = e.intAttribute("lastNumber", 0);
    if (firstNumber == 0) {
        // don't know what this means (spec: no number)
        // cap status equivalent to no first or last number
        from = 1;
        to   = 0;
    } else {
        from = firstNumber;
        to   = (lastNumber == 0) ? firstNumber : lastNumber;
    }
    qDebug("VoltaObj::read firstNumber %d lastNumber %d", firstNumber, lastNumber);
    qDebug("VoltaObj::read x0 %d x1 %d y %d bLeft %d bRight %d bDotted %d allNumbers %d from %d to %d",
           x0, x1, y, bLeft, bRight, bDotted, allNumbers, from, to);
    e.readNext();
}

//---------------------------------------------------------
//   TrillObj::readCapx -- capx equivalent of TrillObj::read
//---------------------------------------------------------

void TrillObj::readCapx(XmlReader& e)
{
    double x0d  = e.doubleAttribute("x1", 0.0);
    double x1d  = e.doubleAttribute("x2", 0.0);
    double yd   = e.doubleAttribute("y", 0.0);
    trillSign   = e.attribute("tr", "true") == "true";
    x0 = (int)round(x0d * 32.0);
    x1 = (int)round(x1d * 32.0);
    y  = (int)round(yd * 32.0);
    // color       -> skipped
    qDebug("TrillObj::read x0 %d x1 %d y %d trillSign %d", x0, x1, y, trillSign);
    e.readNext();
}

//---------------------------------------------------------
//   WedgeObj::readCapx -- capx equivalent of WedgeObj::read
//---------------------------------------------------------

void WedgeObj::readCapx(XmlReader& e)
{
    // TODO: read LineObj properties
    decresc          = e.attribute("decrescendo", "false") == "true";
    double dheight   = e.doubleAttribute("span", 1.0);
    height = (int)round(dheight * 32.0);
    e.readNext();
}

//---------------------------------------------------------
//   readCapxDrawObjectArray -- capx equivalent of readDrawObjectArray()
//---------------------------------------------------------

QList<BasicDrawObj*> Capella::readCapxDrawObjectArray(XmlReader& e)
{
    QList<BasicDrawObj*> ol;
    while (e.readNextStartElement()) {
        if (e.name() == "drawObj") {
            BasicDrawObj* bdo = 0;
            while (e.readNextStartElement()) {
                const QStringRef& tag(e.name());
                if (tag == "basic") {
                    // note: the <basic> element always follows the DrawObject it applies to
                    if (bdo) {
                        bdo->readCapx(e);
                    } else {
                        e.skipCurrentElement();
                    }
                } else if (tag == "line") {
                    qDebug("readCapxDrawObjectArray: found line (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "rectangle") {
                    qDebug("readCapxDrawObjectArray: found rectangle (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "ellipse") {
                    qDebug("readCapxDrawObjectArray: found ellipse (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "polygon") {
                    qDebug("readCapxDrawObjectArray: found polygon (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "metafile") {
                    qDebug("readCapxDrawObjectArray: found metafile (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "text") {
                    SimpleTextObj* o = new SimpleTextObj(this);
                    bdo = o;           // save o to handle the "basic" tag (which sometimes follows)
                    o->readCapx(e);
                    ol.append(o);
                } else if (tag == "richText") {
                    qDebug("readCapxDrawObjectArray: found richText (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "guitar") {
                    qDebug("readCapxDrawObjectArray: found guitar (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "slur") {
                    SlurObj* o = new SlurObj(this);
                    bdo = o;           // save o to handle the "basic" tag (which sometimes follows)
                    o->readCapx(e);
                    ol.append(o);
                } else if (tag == "wavyLine") {
                    qDebug("readCapxDrawObjectArray: found wavyLine (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "bracket") {
                    qDebug("readCapxDrawObjectArray: found bracket (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "wedge") {
                    WedgeObj* o = new WedgeObj(this);
                    bdo = o;           // save o to handle the "basic" tag (which sometimes follows)
                    o->readCapx(e);
                    ol.append(o);
                } else if (tag == "notelines") {
                    qDebug("readCapxDrawObjectArray: found notelines (skipping)");
                    e.skipCurrentElement();
                } else if (tag == "volta") {
                    VoltaObj* o = new VoltaObj(this);
                    bdo = o;           // save o to handle the "basic" tag (which sometimes follows)
                    o->readCapx(e);
                    ol.append(o);
                } else if (tag == "trill") {
                    TrillObj* o = new TrillObj(this);
                    bdo = o;           // save o to handle the "basic" tag (which sometimes follows)
                    o->readCapx(e);
                    ol.append(o);
                } else if (tag == "transposable") {
                    TransposableObj* o = new TransposableObj(this);
                    bdo = o;           // save o to handle the "basic" tag (which sometimes follows)
                    o->readCapx(e);
                    ol.append(o);
                } else if (tag == "group") {
                    qDebug("readCapxDrawObjectArray: found group (skipping)");
                    e.skipCurrentElement();
                } else {
                    e.unknown();
                }
            }
        } else {
            e.unknown();
        }
    }
    return ol;
}

//---------------------------------------------------------
//   readCapxVoice -- capx equivalent of readVoice(CapStaff* cs, int idx)
//---------------------------------------------------------

void Capella::readCapxVoice(XmlReader& e, CapStaff* cs, int idx)
{
    CapVoice* v   = new CapVoice;
    v->voiceNo    = idx;
    v->y0Lyrics   = 0;
    v->dyLyrics   = 0;
    // v->lyricsFont = 0;
    v->stemDir    = 0;

    while (e.readNextStartElement()) {
        if (e.name() == "lyricsSettings") {
            qDebug("readCapxVoice: found lyricsSettings (skipping)");
            e.skipCurrentElement();
        } else if (e.name() == "noteObjects") {
            while (e.readNextStartElement()) {
                const QStringRef& tag(e.name());
                if (tag == "clefSign") {
                    CapClef* clef = new CapClef(this);
                    clef->readCapx(e);
                    v->objects.append(clef);
                } else if (tag == "keySign") {
                    CapKey* key = new CapKey(this);
                    key->readCapx(e);
                    v->objects.append(key);
                } else if (tag == "timeSign") {
                    CapMeter* meter = new CapMeter(this);
                    meter->readCapx(e);
                    v->objects.append(meter);
                } else if (tag == "barline") {
                    CapExplicitBarline* bl = new CapExplicitBarline(this);
                    bl->readCapx(e);
                    v->objects.append(bl);
                } else if (tag == "chord") {
                    ChordObj* chord = new ChordObj(this);
                    chord->readCapx(e);
                    v->objects.append(chord);
                } else if (tag == "rest") {
                    RestObj* rest = new RestObj(this);
                    rest->readCapx(e);
                    v->objects.append(rest);
                } else {
                    e.unknown();
                }
            }
        } else {
            e.unknown();
        }
    }

    cs->voices.append(v);
}

//---------------------------------------------------------
//   findStaffIndex -- find index of layout in staffLayouts
//---------------------------------------------------------

static int findStaffIndex(const QString& layout, const QList<CapStaffLayout*>& staffLayouts)
{
    int index = 0;
    for (const auto& capStaffLayout : staffLayouts) {
        if (capStaffLayout->descr == layout) {
            return index;
        }
        ++index;
    }
    qFatal("staff layout '%s' not found", qPrintable(layout));
    return 0;
}

//---------------------------------------------------------
//   readCapxStaff -- capx equivalent of readStaff(CapSystem* system)
//---------------------------------------------------------

void Capella::readCapxStaff(XmlReader& e, CapSystem* system)
{
    qDebug("Capella::readCapxStaff");
    CapStaff* staff = new CapStaff;
    QString layout = e.attribute("layout");
    QString time = e.attribute("defaultTime");
    qstring2timesig(time, staff->numerator, staff->log2Denom, staff->allaBreve);

    staff->iLayout   = findStaffIndex(layout,staffLayouts());
    staff->topDistX  = 0;
    staff->btmDistX  = 0;
    staff->color     = Qt::black;

    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "extraDistance") {
            qDebug("readCapxStaff: found extraDistance (skipping)");
            e.skipCurrentElement();
        } else if (tag == "voices") {
            int i = 0;
            while (e.readNextStartElement()) {
                if (e.name() == "voice") {
                    readCapxVoice(e, staff, i);
                    ++i;
                } else {
                    e.unknown();
                }
            }
        } else {
            e.unknown();
        }
    }

    system->staves[staff->iLayout] = staff;
}

//---------------------------------------------------------
//   initUnreadStaves
//---------------------------------------------------------

static void initUnreadStaves(QList<CapStaff*>& staves)
{
    // find the first staff actually read
    CapStaff* firstNonEmptyStaff = nullptr;
    for (const auto staff : staves) {
        if (staff && !firstNonEmptyStaff) {
            firstNonEmptyStaff = staff;
        }
    }

    // copy its data to the staves present in the file
    for (int i = 0; i < staves.size(); ++i) {
        if (!(staves.at(i))) {
            auto staff = new CapStaff;
            staff->numerator = firstNonEmptyStaff->numerator;
            staff->log2Denom = firstNonEmptyStaff->log2Denom;
            staff->allaBreve = firstNonEmptyStaff->allaBreve;
            staff->iLayout = i;
            staves[i] = staff;
        }
    }
}

//---------------------------------------------------------
//   readCapxSystem -- capx equivalent of readSystem()
//---------------------------------------------------------

void Capella::readCapxSystem(XmlReader& e)
{
    CapSystem* s = new CapSystem;
    s->nAddBarCount   = 0;
    s->bBarCountReset = 0;
    s->explLeftIndent = 0;   // ?? TODO ?? use in capella.cpp commented out

    s->beamMode = BeamMode::AUTO;
    s->tempo    = 0;
    s->color    = Qt::black;

    unsigned char b  = 0;
    s->bJustified    = b & 2;
    s->bPageBreak    = (b & 4) != 0;
    s->instrNotation = (b >> 3) & 7;

    // set all staves in this system to "not yet read"
    for (int i = 0; i < _staffLayouts.size(); ++i) {
        s->staves.append(nullptr);
    }

    // read staves
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "barCount") {
            qDebug("readCapxSystem: found barCount (skipping)");
            e.skipCurrentElement();
        } else if (tag == "staves") {
            while (e.readNextStartElement()) {
                if (e.name() == "staff") {
                    readCapxStaff(e, s);
                } else {
                    e.unknown();
                }
            }
        } else {
            e.unknown();
        }
    }

    // initializes staves not read
    initUnreadStaves(s->staves);

    systems.append(s);
}

//---------------------------------------------------------
//   capxSystems -- read the capx <systems> element
//---------------------------------------------------------

void Capella::capxSystems(XmlReader& e)
{
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "system") {
            readCapxSystem(e);
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   capxNotation -- read the capx <notation> element
//---------------------------------------------------------

static void capxNotation(XmlReader& e, uchar& barlineMode, uchar& barlineFrom, uchar& barlineTo)
{
    while (e.readNextStartElement()) {
        if (e.name() == "barlines") {
            QString mode = e.attribute("mode", "full");
            if (mode == "full") {
                barlineMode = 3;
            } else if (mode == "none") {
                barlineMode = 2;                                // correct ? not handled by capella.cpp anyway
            } else if (mode == "internal") {
                barlineMode = 1;
            } else if (mode == "external") {
                barlineMode = 0;                                // correct ? not handled by capella.cpp anyway
            } else {
                barlineMode = 1;
            }
            barlineFrom = e.intAttribute("from");
            barlineTo   = e.intAttribute("to");
            e.readNext();
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   readCapxStaveLayout -- capx equivalent of readStaveLayout(CapStaffLayout*, int)
//   read the staffLayout element
//---------------------------------------------------------

void Capella::readCapxStaveLayout(XmlReader& e, CapStaffLayout* sl, int /*idx*/)
{
    // initialize same variables as readStaveLayout(CapStaffLayout*, int)

    sl->barlineMode = 0;
    sl->noteLines   = 0;

    sl->bSmall      = 0;   // TODO (unclear where this is in the capx file)

    sl->topDist      = 0;
    sl->btmDist      = 0;
    sl->groupDist    = 0;
    sl->barlineFrom = 0;
    sl->barlineTo   = 0;

    unsigned char clef = 0;
    sl->form = Form(clef & 7);
    sl->line = ClefLine((clef >> 3) & 7);
    sl->oct  = Oct((clef >> 6));
    // qDebug("   clef %x  form %d, line %d, oct %d", clef, sl->form, sl->line, sl->oct);

    // Schlagzeuginformation
    unsigned char b   = 0;   // ?? TODO ?? sl->soundMapIn and sl->soundMapOut are not used
    sl->bPercussion  = b & 1;      // Schlagzeugkanal verwenden
    sl->bSoundMapIn  = b & 2;
    sl->bSoundMapOut = b & 4;
    /*
    if (sl->bSoundMapIn) {      // Umleitungstabelle fr Eingabe vom Keyboard
          uchar iMin = readByte();
          Q_UNUSED(iMin);
          uchar n    = readByte();
          Q_ASSERT(n > 0 and iMin + n <= 128);
          f->read(sl->soundMapIn, n);
          curPos += n;
          }
    if (sl->bSoundMapOut) {     // Umleitungstabelle fr das Vorspielen
          unsigned char iMin = readByte();
          unsigned char n    = readByte();
          Q_ASSERT(n > 0 and iMin + n <= 128);
          f->read(sl->soundMapOut, n);
          curPos += n;
          }
    */
    sl->sound  = 0;
    sl->volume = 0;
    sl->transp = 0;

    qDebug("readCapxStaveLayout");
    sl->descr = e.attribute("description");
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "notation") {
            capxNotation(e, sl->barlineMode, sl->barlineFrom, sl->barlineTo);
        } else if (tag == "distances") {
            qDebug("readCapxStaveLayout: found distances (skipping)");
            e.skipCurrentElement();
        } else if (tag == "instrument") {
            sl->name = e.attribute("name");
            sl->abbrev = e.attribute("abbrev");
            // elements name and abbrev overrule attributes name and abbrev
            while (e.readNextStartElement()) {
                const QStringRef& t(e.name());
                if (t == "name") {
                    sl->name = e.readElementText();
                } else if (t == "abbrev") {
                    sl->abbrev = e.readElementText();
                } else {
                    e.unknown();
                }
            }
        } else if (tag == "sound") {
            sl->sound = e.intAttribute("instr", 0);
            sl->volume = e.intAttribute("volume", 0);
            sl->transp = e.intAttribute("transpose", 0);
            e.readNext();
        } else {
            e.unknown();
        }
    }
    qDebug("   descr '%s' name '%s' abbrev '%s'",
           qPrintable(sl->descr), qPrintable(sl->name), qPrintable(sl->abbrev));
    qDebug("   sound %d vol %d transp %d", sl->sound, sl->volume, sl->transp);
    qDebug("readCapxStaveLayout done");
}

//---------------------------------------------------------
//   capxLayoutBrackets -- read the capx <brackets> element (when child of <layout)
//---------------------------------------------------------

static void capxLayoutBrackets(XmlReader& e, QList<CapBracket>& bracketList)
{
    int i = 0;   // bracket count
    while (e.readNextStartElement()) {
        if (e.name() == "bracket") {
            CapBracket b;
            b.from  = e.intAttribute("from");
            b.to    = e.intAttribute("to");
            b.curly = e.attribute("curly") == "true";
            // qDebug("Bracket%d %d-%d curly %d", i, b.from, b.to, b.curly);
            bracketList.append(b);
            e.readNext();
            ++i;
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   capxLayoutDistances -- read the capx <Distances> element (when child of <layout)
//---------------------------------------------------------

static void capxLayoutDistances(XmlReader& e, double& smallLineDist, double& normalLineDist, int& topDist)
{
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "staffLines") {
            smallLineDist = e.doubleAttribute("small");
            normalLineDist = e.doubleAttribute("normal");
            e.readNext();
        } else if (tag == "systems") {
            topDist = e.intAttribute("top");
            e.readNext();
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   capxLayoutStaves -- read the capx <staves> element (when child of <layout)
//---------------------------------------------------------

void Capella::capxLayoutStaves(XmlReader& e)
{
    int iStave = 0;
    while (e.readNextStartElement()) {
        if (e.name() == "staffLayout") {
            CapStaffLayout* sl = new CapStaffLayout;
            readCapxStaveLayout(e, sl, iStave);
            _staffLayouts.append(sl);
            ++iStave;
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   capxLayout -- read the capx <layout> element
//   rough equivalent of readLayout() read part
//---------------------------------------------------------

void Capella::capxLayout(XmlReader& e)
{
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "pages") {
            qDebug("capxLayout: found pages (skipping)");
            e.skipCurrentElement();
        } else if (tag == "distances") {
            capxLayoutDistances(e, smallLineDist, normalLineDist, topDist);
            // qDebug("Capella::capxLayout(): smallLineDist %g normalLineDist %g topDist %d",
            //        smallLineDist, normalLineDist, topDist);
        } else if (tag == "instrumentNames") {
            qDebug("capxLayout: found instrumentNames (skipping)");
            e.skipCurrentElement();
        } else if (tag == "style") {
            qDebug("capxLayout: found style (skipping)");
            e.skipCurrentElement();
        } else if (tag == "staves") {
            capxLayoutStaves(e);
        } else if (tag == "brackets") {
            capxLayoutBrackets(e, brackets);
        } else if (tag == "spacing") {
            qDebug("capxLayout: found spacing (skipping)");
            e.skipCurrentElement();
        } else if (tag == "beamFlattening") {
            qDebug("capxLayout: found beamFlattening (skipping)");
            e.skipCurrentElement();
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   initCapxLayout -- capx equivalent of readLayout() initialize part
//---------------------------------------------------------

void Capella::initCapxLayout()
{
    // initialize same variables as readLayout()

    smallLineDist  = 1.2;    // TODO verify default
    normalLineDist = 1.76;   // TODO verify default

    topDist        = 14;     // TODO verify default
    interDist      = 0;      // TODO verify default

    txtAlign   = 0;
    adjustVert = 0;

    unsigned char b          = 0;
    redundantKeys    = b & 1;
    modernDoubleNote = b & 2;
    Q_ASSERT((b & 0xFC) == 0);   // bits 2...7 reserviert

    bSystemSeparators = 0;
    nUnnamed           = 0;

    // namesFont = ... // ?? not used ??

    // Note: readLayout() also reads stave layout (using readStaveLayout(sl, iStave))
    // and system brackets. Here this is handled by readCapx(XmlReader& e).
}

//---------------------------------------------------------
//   readCapx -- capx equivalent of read(QFile* fp)
//---------------------------------------------------------

void Capella::readCapx(XmlReader& e)
{
    // initialize same variables as read(QFile* fp)

    f      = 0;
    curPos = 0;

    author   = 0;
    keywords = 0;
    comment  = 0;

    nRel   = 0;
    nAbs   = 0;
    unsigned char b   = 0;
    bUseRealSize      = b & 1;
    bAllowCompression = b & 2;
    bPrintLandscape   = b & 16;

    beamRelMin0 = 0;
    beamRelMin1 = 0;
    beamRelMax0 = 0;
    beamRelMax1 = 0;

    backgroundChord = new ChordObj(this);           // contains graphic objects on the page background
    bShowBarCount    = 0;
    barNumberFrame   = 0;
    nBarDistX        = 0;
    nBarDistY        = 0;
    // QFont barNumFont = ... // not used ?
    nFirstPage       = 0;
    leftPageMargins  = 0;
    topPageMargins   = 0;
    rightPageMargins = 0;
    btmPageMargins   = 0;

    // Now do the equivalent of:
    // readLayout(); (called only once)
    // readExtra();  (this is a NOP)
    // readDrawObjectArray();
    // for (unsigned i = 0; i < nSystems; i++)
    //       readSystem();

    initCapxLayout();

    // read stave layout
    // read systems
    while (e.readNextStartElement()) {
        const QStringRef& tag(e.name());
        if (tag == "info") {
            qDebug("importCapXml: found info (skipping)");
            e.skipCurrentElement();
        } else if (tag == "layout") {
            capxLayout(e);
        } else if (tag == "gallery") {
            qDebug("capxLayout: found gallery (skipping)");
            e.skipCurrentElement();
        } else if (tag == "pageObjects") {
            backgroundChord->readCapxObjectArray(e);
        } else if (tag == "barCount") {
            qDebug("importCapXml: found barCount (skipping)");
            e.skipCurrentElement();
        } else if (tag == "systems") {
            capxSystems(e);
        } else {
            e.unknown();
        }
    }
}

//---------------------------------------------------------
//   importCapXml
//---------------------------------------------------------

void convertCapella(Score* score, Capella* cap, bool capxMode);

Score::FileError importCapXml(MasterScore* score, const QString& name)
{
    qDebug("importCapXml(score %p, name %s)", score, qPrintable(name));
    MQZipReader uz(name);
    if (!uz.exists()) {
        qDebug("importCapXml: <%s> not found", qPrintable(name));
        return Score::FileError::FILE_NOT_FOUND;
    }

    QByteArray dbuf = uz.fileData("score.xml");
    XmlReader e(dbuf);
    e.setDocName(name);
    Capella cf;

    while (e.readNextStartElement()) {
        if (e.name() == "score") {
            const QString& xmlns = e.attribute("xmlns", "<none>");       // doesn't work ???
            qDebug("importCapXml: found score, namespace '%s'", qPrintable(xmlns));
            cf.readCapx(e);
        } else {
            e.unknown();
        }
    }

    convertCapella(score, &cf, true);
    return Score::FileError::FILE_NO_ERROR;
}
}
