#! /usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Copyright 2022, Nils Hilbricht, Germany ( https://www.hilbricht.net )

This file is part of the Laborejo Software Suite ( https://www.laborejo.org ),

Laborejo2 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 3 of the License, or
(at your option) any later version.

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, see <http://www.gnu.org/licenses/>.
"""

import logging; logger = logging.getLogger(__name__); logger.info("import")

#Standard Library
from sys import maxsize

#Third party
from PyQt5 import QtCore, QtGui, QtWidgets
translate = QtCore.QCoreApplication.translate

#Template
import template.engine.pitch as pitch
from template.qtgui.helper import QHLine, makeValueWidget, getValueFromWidget
from template.qtgui.submenus import *

#Our own files
import engine.api as api
from engine.midiinput.stepmidiinput import stepMidiInput  #singleton instance. Don't allow midi input when submenus are open.
from .constantsAndConfigs import constantsAndConfigs
from .designer.tickWidget import Ui_tickWidget

#Wrap Submenu call to deactivate midi input while showing the menu.
orgCall = Submenu.__call__
def wrapCallDeactivateMidIn(self):
    remember = stepMidiInput.midiInIsActive
    stepMidiInput.setMidiInputActive(False)
    orgCall(self)
    stepMidiInput.setMidiInputActive(remember)
Submenu.__call__ = wrapCallDeactivateMidIn

class CombinedTickWidget(QtWidgets.QFrame):
    def __init__(self, mainWindow):
        super().__init__(mainWindow)
        self.mainWindow = mainWindow
        self.setFrameShape(QtWidgets.QFrame.Box)
        self.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.horizontalLayout_3 = QtWidgets.QHBoxLayout(self)
        self.horizontalLayout_3.setContentsMargins(3, 0, 3, 0)
        self.horizontalLayout_3.setSpacing(0)
        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
        self.upbeatSpinBox = QtWidgets.QSpinBox(self)
        self.upbeatSpinBox.setPrefix("")
        self.upbeatSpinBox.setMinimum(0)
        self.upbeatSpinBox.setMaximum(999999999)
        self.upbeatSpinBox.setObjectName("upbeatSpinBox")
        self.horizontalLayout_3.addWidget(self.upbeatSpinBox)
        self.callTickWidget = QtWidgets.QPushButton(self)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.callTickWidget.sizePolicy().hasHeightForWidth())
        self.callTickWidget.setSizePolicy(sizePolicy)
        self.callTickWidget.setMaximumSize(QtCore.QSize(25, 16777215))
        self.callTickWidget.setFlat(False)
        self.callTickWidget.setObjectName("callTickWidget")
        self.callTickWidget.setText("𝅘𝅥𝅮 ")

        self.horizontalLayout_3.addWidget(self.callTickWidget)
        self.callTickWidget.clicked.connect(self.callClickWidgetForUpbeat)

        self.setFocusPolicy(0) #no focus
        self.callTickWidget.setFocusPolicy(0) #no focus

        self.valueChanged = self.upbeatSpinBox.valueChanged

    def setMinimum(self, value):
        self.upbeatSpinBox.setMinimum(int(value))

    def setMaximum(self, value):
        self.upbeatSpinBox.setMaximum(int(value))

    def setValue(self, value):
        self.upbeatSpinBox.setValue(int(value))

    def value(self):
        """Make this widget behave like a spinbox signal"""
        return self.upbeatSpinBox.value()

    def callClickWidgetForUpbeat(self):
        dialog = TickWidget(self.mainWindow, initValue = self.upbeatSpinBox.value())
        self.upbeatSpinBox.setValue(int(dialog.ui.ticks.value()))

class TickWidget(QtWidgets.QDialog):
    def __init__(self, parentWindow, initValue = 0):
        super().__init__()

        #Set up the user interface  from Designer.
        self.ui =  Ui_tickWidget()
        self.ui.setupUi(self)

        #This without init(parentWindow) will result in a nicely positioned window, that is not accesible :(
        """
        self.setParent(parentWindow)
        self.setAutoFillBackground(True)
        self.setModal(False)
        self.raise_()
        self.activateWindow()
        """



        #self.ui.ticks.setValue(initValue)
        self.ui.ticks.setValue(0) #TODO: easier to drawLabel this way. change back to given value when drawLabel is autogenerated and does not work by keeping track anymore.

        self.ui.ok.clicked.connect(lambda: self.done(True))
        self.ui.cancel.clicked.connect(lambda: self.done(False))
        self.ui.reset.clicked.connect(self.reset)

        self.ui.durationLabel.setText("")

        self.clickedSoFar = [] #keep track. This is purely cosmetical to remember the click history.
        self.multipliers = [] #keep track. This is purely cosmetical to remember the click history.

        self.ui.D1.clicked.connect(lambda: self.addDuration(api.D1))
        self.ui.D2.clicked.connect(lambda: self.addDuration(api.D2))
        self.ui.D4.clicked.connect(lambda: self.addDuration(api.D4))
        self.ui.D8.clicked.connect(lambda: self.addDuration(api.D8))
        self.ui.D16.clicked.connect(lambda: self.addDuration(api.D16))

        self.ui.D32.clicked.connect(lambda: self.addDuration(api.D32))
        self.ui.D64.clicked.connect(lambda: self.addDuration(api.D64))
        self.ui.D128.clicked.connect(lambda: self.addDuration(api.D128))
        self.ui.DB.clicked.connect(lambda: self.addDuration(api.DB))
        self.ui.DL.clicked.connect(lambda: self.addDuration(api.DL))


        self.ui.x2.clicked.connect(lambda: self.multiply(2))
        self.ui.x3.clicked.connect(lambda: self.multiply(3))
        self.ui.x5.clicked.connect(lambda: self.multiply(5))
        self.ui.x7.clicked.connect(lambda: self.multiply(7))

        self.ui.ticks.valueChanged.connect(self.drawLabel)

        self.exec() #blocks until the dialog gets closed

        #TODO: better key handling. Esc in the ticks field should not close the dialog but return the keyboard focus to the durations

    def reset(self):
        self.ui.ticks.setValue(0)
        self.clickedSoFar = []
        self.multipliers = []
        self.ui.durationLabel.setText("")

    def addDuration(self, duration:int):
        self.clickedSoFar.append(duration)
        nowTicks = self.ui.ticks.value()
        self.ui.ticks.setValue(nowTicks + duration)

    def multiply(self, times:int):
        self.multipliers.append("x" + str(times))
        nowTicks = self.ui.ticks.value()
        self.ui.ticks.setValue(nowTicks * times)


    def drawLabel(self):
        """This is purely cosmetical"""

        #TODO: with nice partitions of real note icons.
        #Error handling. A too complex or wrong duration (off by one, not equal to a partition etc.) blocks the "OK" button. No, just gives a warning.
        #backendDurationInstance = api.items.Duration.createByGuessing(self.ui.ticks.value())
        #text = backendDurationInstance.lilypond()

        text = []
        for duration, symbol in reversed(sorted(constantsAndConfigs.realNoteDisplay.items())):
            times = self.clickedSoFar.count(duration)
            if times:
                part = str(times) + "x" + symbol
                text.append(part)

        self.ui.durationLabel.setText("( " + " + ".join(text) + " )  " + " ".join(self.multipliers))

class SecondaryClefMenu(Submenu):

    clefs = [(translate("submenus", "[1] Treble"), lambda: api.insertClef("treble")),
             (translate("submenus", "[2] Bass"), lambda: api.insertClef("bass")),
             (translate("submenus", "[3] Alto"), lambda: api.insertClef("alto")),
             (translate("submenus", "[4] Drum"), lambda: api.insertClef("percussion")),
             (translate("submenus", "[5] Treble ^8"), lambda: api.insertClef("treble^8")),
             (translate("submenus", "[6] Treble _8"), lambda: api.insertClef("treble_8")),
             (translate("submenus", "[7] Bass _8 (MIDI Drums)"), lambda: api.insertClef("bass_8")),
            ]

    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "choose a clef"), hasOkCancelButtons=2)

        for number, (prettyname, function) in enumerate(SecondaryClefMenu.clefs):
            button = QtWidgets.QPushButton(prettyname)
            button.setShortcut(QtGui.QKeySequence(str(number+1)))
            self.layout.addWidget(button)
            button.clicked.connect(function)
            button.clicked.connect(self.done)

class SecondarySplitMenu(Submenu):

    splits = [("[2]", lambda: api.split(2)),
              ("[3]", lambda: api.split(3)),
              ("[4]", lambda: api.split(4)),
              ("[5]", lambda: api.split(5)),
              ("[6]", lambda: api.split(6)),
              ("[7]", lambda: api.split(7)),
              ("[8]", lambda: api.split(8)),
              ("[9]", lambda: api.split(9)),
            ]

    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "split chord in"), hasOkCancelButtons=2)

        for number, (prettyname, function) in enumerate(SecondarySplitMenu.splits):
            button = QtWidgets.QPushButton(prettyname)
            button.setShortcut(QtGui.QKeySequence(str(number+2))) #+1 for enumerate from 0, +2 we start at 2.
            self.layout.addWidget(button)
            button.clicked.connect(function)
            button.clicked.connect(self.done)

class SecondaryDuplicateMenu(Submenu):


    duplicates = [("[1]", lambda: api.duplicate(1)),
              ("[2]", lambda: api.duplicate(2)),
              ("[3]", lambda: api.duplicate(3)),
              ("[4]", lambda: api.duplicate(4)),
              ("[5]", lambda: api.duplicate(5)),
              ("[6]", lambda: api.duplicate(6)),
              ("[7]", lambda: api.duplicate(7)),
              ("[8]", lambda: api.duplicate(8)),
              ("[9]", lambda: api.duplicate(9)),
            ]

    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "duplicate how often?"), hasOkCancelButtons=2)

        for number, (prettyname, function) in enumerate(SecondaryDuplicateMenu.duplicates):
            button = QtWidgets.QPushButton(prettyname)
            button.setShortcut(QtGui.QKeySequence(str(number+1))) #+1 for enumerate from 0, +1 we start at 1.
            self.layout.addWidget(button)
            button.clicked.connect(function)
            button.clicked.connect(self.done)

class SecondaryKeySignatureMenu(Submenu):
    def __init__(self, mainWindow):
        """Init is only called once per program, during startup"""

        super().__init__(mainWindow, translate("submenus", "root note is the cursor position"), hasOkCancelButtons=2)
        l = [("[{}] {}".format(num+1, modeString.title()), lambda r, modeString=modeString: api.insertCursorCommonKeySignature(modeString)) for num, modeString in enumerate(api.commonKeySignaturesAsList())]

        for number, (prettyname, function) in enumerate(l):
            button = QtWidgets.QPushButton(prettyname)
            button.setShortcut(QtGui.QKeySequence(str(number+1)))
            self.layout.addWidget(button)
            button.clicked.connect(function)
            button.clicked.connect(self.done)

    def __call__(self):
        self.dynamicLabel.setText("Note: " + api.getCursorSimpleLyNote())
        super().__call__()


class SecondaryDynamicsMenu(Submenu):
    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "choose a dynamic"), hasOkCancelButtons=2)
        button = QtWidgets.QPushButton(translate("submenus", "[r] Ramp"))
        button.setShortcut(QtGui.QKeySequence("r"))
        self.layout.addWidget(button)
        button.clicked.connect(api.insertDynamicRamp)
        button.clicked.connect(self.done)

        l = [("[{}] {}".format(num+1, keyword), lambda r, keyword=keyword: api.insertDynamicSignature(keyword)) for num, keyword in enumerate(constantsAndConfigs.dynamics)]

        for number, (prettyname, function) in enumerate(l):
            button = QtWidgets.QPushButton(prettyname)
            button.setShortcut(QtGui.QKeySequence(str(number+1)))
            self.layout.addWidget(button)
            button.clicked.connect(function)
            button.clicked.connect(self.done)

class SecondaryMetricalInstructionMenu(Submenu):
    def __init__(self, mainWindow, setInitialInsteadCursorInsert:bool=False):
        super().__init__(mainWindow, translate("submenus", "choose a metrical instruction"), hasOkCancelButtons=2)

        if setInitialInsteadCursorInsert: #different api function
            l = [("[{}] {}".format(num+1, modeString), lambda r, modeString=modeString: api.insertCommonMetricalInstrucions(modeString, setInitialInsteadCursorInsert=True)) for num, modeString in enumerate(api.commonMetricalInstructionsAsList())]
        else:
            l = [("[{}] {}".format(num+1, modeString), lambda r, modeString=modeString: api.insertCommonMetricalInstrucions(modeString)) for num, modeString in enumerate(api.commonMetricalInstructionsAsList())]

        for number, (prettyname, function) in enumerate(l):
            button = QtWidgets.QPushButton(prettyname)
            button.setShortcut(QtGui.QKeySequence(str(number+1)))
            self.layout.addWidget(button)
            button.clicked.connect(function)
            button.clicked.connect(self.done)

class SecondaryTempoChangeMenu(Submenu):
    """A single tempo change where the user can decide which reference unit and how many of them
    per minute.
    Works as "edit tempo point" when there is already a point at this time position.
    This would be the case anyway thanks to backend-behaviour but the gui has the opportunity to
    present the current values as a base for editing"""


    def __init__(self, mainWindow, staticExportTempoItem = None):
        super().__init__(mainWindow, translate("submenus", "choose units per minute, reference note, graph type\nand an optional description like 'Allegro'"), hasOkCancelButtons=True)

        self.mainWindow = mainWindow
        self.staticExportTempoItem = staticExportTempoItem

        tickindex, unitsPerMinute, referenceTicks, graphType, description = self.getCurrentValues() #takes self.staticExportTempoItem into account

        self.unitbox = QtWidgets.QSpinBox()
        self.unitbox.setMinimum(1)
        self.unitbox.setMaximum(999)
        self.unitbox.setValue(unitsPerMinute)
        self.layout.addWidget(self.unitbox)

        self.referenceList = QtWidgets.QComboBox()
        self.referenceList.addItems(constantsAndConfigs.prettyExtendedRhythmsStrings)
        self.referenceList.setCurrentIndex(constantsAndConfigs.prettyExtendedRhythmsValues.index(referenceTicks))
        self.layout.addWidget(self.referenceList)

        self.interpolationList = QtWidgets.QComboBox()
        l = api.getListOfGraphInterpolationTypesAsStrings()
        self.interpolationList.addItems(l)
        self.interpolationList.setCurrentIndex(l.index(graphType))
        self.layout.addWidget(self.interpolationList)

        self.description = QtWidgets.QLineEdit(description)
        self.layout.addWidget(self.description)


        self.__call__()

    def process(self):
        """It says 'insert' but the backend is a dict. Changes are simply made by overwriting the
        whole thing and the backend sends new data to draw to the GUI"""
        tickindex, unitsPerMinute, referenceTicks, graphType, description = self.getCurrentValues()
        newReferenceTicks = constantsAndConfigs.prettyExtendedRhythmsValues[self.referenceList.currentIndex()]
        graphType = api.getListOfGraphInterpolationTypesAsStrings()[self.interpolationList.currentIndex()]
        description = self.description.text()
        api.insertTempoItemAtAbsolutePosition(tickindex, self.unitbox.value(), newReferenceTicks, graphType, description)
        self.done(True)

    def getCurrentValues(self):
        """Get the current values from the note-editing backend cursor"""
        if self.staticExportTempoItem:
            return self.staticExportTempoItem["position"], self.staticExportTempoItem["unitsPerMinute"], self.staticExportTempoItem["referenceTicks"], self.staticExportTempoItem["graphType"], self.staticExportTempoItem["lilypondParameters"]["tempo"]
        else:
            assert self.mainWindow.scoreView.scoreScene.cursor.cursorExportObject
            return self.mainWindow.scoreView.scoreScene.cursor.cursorExportObject["tickindex"], self.mainWindow.scoreView.scoreScene.cursor.cursorExportObject["tempoUnitsPerMinute"], self.mainWindow.scoreView.scoreScene.cursor.cursorExportObject["tempoReferenceTicks"], self.mainWindow.scoreView.scoreScene.cursor.cursorExportObject["tempoGraphType"], ""  #empty string is the description

class SecondaryTemporaryTempoChangeMenu(Submenu):
    """Essentially: What kind of fermata effect do you want?"""

    lastCustomValue = 0.42

    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "[enter] to use value"), hasOkCancelButtons=True)

        self.spinbox = QtWidgets.QDoubleSpinBox()
        self.spinbox.setValue(SecondaryTemporaryTempoChangeMenu.lastCustomValue)
        self.spinbox.setDecimals(2)
        self.spinbox.setMinimum(0.01)
        self.spinbox.setSingleStep(0.01)
        self.layout.addWidget(self.spinbox)

    def process(self):
        v = round(self.spinbox.value(), 2)
        SecondaryTemporaryTempoChangeMenu.lastCustomValue = v
        api.insertTempoChangeDuringDuration(v)
        self.done(True)

class BlockPropertiesEdit(Submenu):
    def __init__(self, mainWindow, staticExportItem):
        super().__init__(mainWindow, "", hasOkCancelButtons=True)

        self.mainWindow = mainWindow
        self.staticExportItem = staticExportItem

        self.layout.insertRow(0, QtWidgets.QLabel(translate("submenus", "edit block #{}").format(staticExportItem["id"])))

        self.name = QtWidgets.QLineEdit(self.staticExportItem["name"])
        self.name.selectAll()
        self.layout.addRow(translate("submenus", "name"), self.name)

        #self.minimumInTicks = QtWidgets.QSpinBox()
        self.minimumInTicks = CombinedTickWidget(mainWindow)
        self.minimumInTicks.setValue(self.staticExportItem["minimumInTicks"])
        self.layout.addRow(translate("submenus", "minimum in ticks"), self.minimumInTicks)

        self.setMinimumToCurrentButton = QtWidgets.QPushButton(translate("submenus","Set min. to current"))
        self.setMinimumToCurrentButton.clicked.connect(self.setMinimumToCurrent)
        self.layout.addRow(None, self.setMinimumToCurrentButton)

        self.__call__()

    def setMinimumToCurrent(self):
        self.minimumInTicks.setValue(self.staticExportItem["completeDuration"])

    def process(self):
        newParametersDict = {
            "minimumInTicks":self.minimumInTicks.value(),
            "name":self.name.text(),
        }
        api.changeBlock(self.staticExportItem["id"], newParametersDict)
        self.done(True)

class TempoBlockPropertiesEdit(Submenu):
    def __init__(self, mainWindow, staticExportItem):
        super().__init__(mainWindow, "", hasOkCancelButtons=True)

        self.mainWindow = mainWindow
        self.staticExportItem = staticExportItem

        self.layout.insertRow(0, QtWidgets.QLabel(translate("submenus", "edit block #{}").format(staticExportItem["id"])))

        self.name = QtWidgets.QLineEdit(self.staticExportItem["name"])
        self.name.selectAll()
        self.layout.addRow(translate("submenus", "name"), self.name)

        self.duration = CombinedTickWidget(mainWindow)
        self.duration.setValue(self.staticExportItem["duration"])
        self.layout.addRow(translate("submenus", "duration in ticks"), self.duration)

        self.__call__()

    def process(self):
        newParametersDict = {
            "duration":self.duration.value(),
            "name":self.name.text(),
        }
        api.changeTempoBlock(self.staticExportItem["id"], newParametersDict)
        self.done(True)

class TransposeMenu(Submenu):
    def __init__(self, mainWindow, what):
        super().__init__(mainWindow, translate("submenus", "Transpose {}").format(what.title()), hasOkCancelButtons=True)
        assert what in ("item", "score")
        self.what = what

        self.layout.insertRow(0, QtWidgets.QLabel(translate("submenus", "Construct Interval from relative distance")))

        self.fromNote = QtWidgets.QComboBox()
        self.fromNote.addItems(pitch.sortedNoteNameList)

        self.fromNote.setCurrentIndex(pitch.sortedNoteNameList.index("c'"))
        self.layout.addRow("from", self.fromNote)

        self.to = QtWidgets.QComboBox()
        self.to.addItems(pitch.sortedNoteNameList)
        self.to.setCurrentIndex(pitch.sortedNoteNameList.index("c'"))
        self.layout.addRow("to", self.to)
        self.__call__()


    def process(self):
        fromPitch = pitch.ly2pitch[self.fromNote.currentText()]
        toPitch = pitch.ly2pitch[self.to.currentText()]

        if self.what == "item":
            api.transpose(fromPitch, toPitch) #item on cursor position
        elif self.what == "score":
            api.transposeScore(fromPitch, toPitch)
        self.done(True)

class SecondaryProperties(Submenu):
    """Lilypond Settings and Properties.
    Directly edits the backend score meta data. There is no api and no callbacks"""

    def __init__(self, mainWindow):

        super().__init__(mainWindow, translate("submenus", "Lilypond Properties and Metada"), hasOkCancelButtons=True)

        dictionary = api.getMetadata() #Do not confuse with template/config METADATA. This is Lilypond title, composer etc.
        #The dictionary is mutable. We edit in place. #TODO:  This might bite us in the future. But maybe it will not...

        test = set(type(key) for key in dictionary.keys())
        assert len(test) == 1
        assert list(test)[0] == str

        self.widgets = {key:makeValueWidget(value) for key, value in dictionary.items()}
        importantKeys = ("title", "composer", "instrument", "copyright")

        #Draw important metadata widgets first
        for k in importantKeys:
            self.layout.addRow(k.title(), self.widgets[k])

        self.layout.addRow(QHLine())

        #Then the rest in alphabetical order
        for key, widget in sorted(self.widgets.items()):
            if not key in importantKeys:
                self.layout.addRow(key.title(), widget)

        self.dynamicLabel.setText("<img src=':lilypond-metadata-preview.png'>")

        self.__call__()

    def process(self):
        api.setMetadata({key:getValueFromWidget(widget) for key, widget in self.widgets.items()})
        self.done(True)
        #Instance gets killed afterwards. No need to save the new values.

class SecondaryProgramChangeMenu(Submenu):
    lastProgramValue = 0
    lastMsbValue = 0
    lastLsbValue = 0

    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "Instrument Change"), hasOkCancelButtons=True)

        self.program = QtWidgets.QSpinBox()
        self.program.setValue(type(self).lastProgramValue)
        self.msb = QtWidgets.QSpinBox()
        self.msb.setValue(type(self).lastMsbValue)
        self.lsb = QtWidgets.QSpinBox()
        self.lsb.setValue(type(self).lastLsbValue)
        self.shortInstrumentName = QtWidgets.QLineEdit()

        for label, spinbox in ((translate("submenus", "Program"), self.program), (translate("submenus", "Bank MSB"), self.msb), (translate("submenus", "Bank LSB"), self.lsb)):
            spinbox.setMinimum(0)
            spinbox.setMaximum(127)
            spinbox.setSingleStep(1)
            self.layout.addRow(label, spinbox)

        self.layout.addRow(translate("submenus", "Short Name"), self.shortInstrumentName)

    def process(self):
        program = self.program.value()
        type(self).lastProgramValue = program
        msb = self.msb.value()
        type(self).lastMsbValue = msb
        lsb = self.lsb.value()
        type(self).lastLsbValue = lsb

        api.instrumentChange(program, msb, lsb, self.shortInstrumentName.text(), )
        self.done(True)

class SecondaryChannelChangeMenu(Submenu):
    lastCustomValue = 0

    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "Channel Change 1-16. [enter] to use value"), hasOkCancelButtons=True)

        self.spinbox = QtWidgets.QSpinBox()
        self.spinbox.setValue(type(self).lastCustomValue)
        self.spinbox.setMinimum(1)
        self.spinbox.setMaximum(16)
        self.spinbox.setSingleStep(1)
        self.layout.addRow(translate("submenus", "Channel"), self.spinbox)
        self.name = QtWidgets.QLineEdit()
        self.layout.addRow(translate("submenus", "Text"), self.name)

    def process(self):
        v = self.spinbox.value()
        type(self).lastCustomValue = v
        api.channelChange(v-1, self.name.text())
        self.done(True)

class GridRhytmEdit(Submenu):
    def __init__(self, mainWindow):
        super().__init__(mainWindow, "", hasOkCancelButtons=True)

        self.mainWindow = mainWindow

        self.layout.insertRow(0, QtWidgets.QLabel(translate("submenus", "Edit Grid")))
        self.duration = CombinedTickWidget(mainWindow)
        self.duration.setValue(constantsAndConfigs.gridRhythm)
        self.layout.addRow(translate("submenus", "duration in ticks"), self.duration)

        self.opacity = QtWidgets.QSlider(QtCore.Qt.Horizontal)
        self.opacity.setMinimum(0)
        self.opacity.setMaximum(50)
        self.opacityLabel = QtWidgets.QLabel(translate("submenus", "opacity: {}%").format(int(constantsAndConfigs.gridOpacity * 100)))
        self.layout.addRow(self.opacityLabel, self.opacity)
        self.opacity.valueChanged.connect(lambda: self.opacityLabel.setText(translate("submenus", "opacity: {}%").format(self.opacity.value())))
        self.opacity.setValue(int(constantsAndConfigs.gridOpacity * 100))
        self.opacity.valueChanged.connect(lambda: self.mainWindow.scoreView.scoreScene.grid.setOpacity(self.opacity.value() / 100)) #only react to changes after the initial value was set.
        self.__call__()

    def process(self):
        constantsAndConfigs.gridRhythm = self.duration.value()
        constantsAndConfigs.gridOpacity = self.opacity.value() / 100
        api.session.guiSharedDataToSave["grid_opacity"] = constantsAndConfigs.gridOpacity
        api.session.guiSharedDataToSave["grid_rhythm"] = constantsAndConfigs.gridRhythm
        self.mainWindow.scoreView.scoreScene.grid.redrawTickGrid() #opacity was already set live, but finally it will be used here again.
        self.done(True)

    def abortHandler(self):
        self.mainWindow.scoreView.scoreScene.grid.setOpacity(constantsAndConfigs.gridOpacity) #reset to initial value and undo the live preview

class SecondaryMultimeasureRestMenu(Submenu):
    lastCustomValue = 0

    def __init__(self, mainWindow):
        super().__init__(mainWindow, translate("submenus", "Rest for how many measures?\n\n(Only works if there is a metrical instruction.)"), hasOkCancelButtons=True)

        self.spinbox = QtWidgets.QSpinBox()
        self.spinbox.setValue(type(self).lastCustomValue)
        self.spinbox.setMinimum(1)
        self.spinbox.setMaximum(9999)
        self.spinbox.setSingleStep(1)
        self.layout.addRow(translate("submenus", "Measures"), self.spinbox)
        #self.name = QtWidgets.QLineEdit()
        #self.layout.addRow(translate("submenus", "Text"), self.name)

    def process(self):
        v = self.spinbox.value()
        type(self).lastCustomValue = v
        api.insertMultiMeasureRest(v)
        self.done(True)



#Normal Functions
############

def pedalNoteChooser(mainWindow):
    try:
        constantsAndConfigs.realNotesStrings[constantsAndConfigs.realNotesValues.index(constantsAndConfigs.gridRhythm)+1]
        rhythmString = QtWidgets.QInputDialog.getItem(mainWindow, translate("submenus", "Insert Pedal Notes"), translate("submenus", "Use duration as base"),  constantsAndConfigs.realNotesStrings, constantsAndConfigs.realNotesValues.index(constantsAndConfigs.gridRhythm)+1, False)
    except IndexError:
        rhythmString = QtWidgets.QInputDialog.getItem(mainWindow, translate("submenus", "Insert Pedal Notes"), translate("submenus", "Use duration as base"),  constantsAndConfigs.realNotesStrings, constantsAndConfigs.realNotesValues.index(constantsAndConfigs.gridRhythm), False)


    if rhythmString[1]: #bool. Canceled?
        for baseDuration, v in constantsAndConfigs.commonNotes:
            if v == rhythmString[0]:
                api.pedalNotes(baseDuration)

def forwardText(mainWindow, title, function):
    text, status = QtWidgets.QInputDialog.getText(mainWindow, title, title)
    if status:
        function(text)