from PyQt5.QtWidgets import QApplication, QAction, QLabel, QDialogButtonBox, QDialog, QFileDialog, QMessageBox, QPushButton, QLineEdit, QCheckBox, QSpinBox, QDoubleSpinBox, QTableWidgetItem, QTabWidget, QComboBox, QWidget, QScrollArea, QMainWindow, QShortcut, QDialogButtonBox
import sys

class UnsavedMessageBox(QMessageBox):
    """
    Message box to alert the user of unsaved changes and allow them to choose how to act.
    """

    def __init__(self, fileName):
        super().__init__()

        self.setIcon(QMessageBox.Information)
        self.setWindowTitle("Unsaved changes")
        self.setText(f"The document \"{fileName}\" has been modified.")
        self.setInformativeText("Do you want to save your changes?")
        self.setStandardButtons(
            QMessageBox.Save | QMessageBox.Discard | QMessageBox.Cancel)
        self.setDefaultButton(QMessageBox.Save)
        
        # If we are running on Haiku, use the MacOS button style to fit in more
        # with native applications
        if sys.platform.startswith("haiku"):
            buttonBox = self.findChild(QDialogButtonBox)
            buttonBox.setStyleSheet("* { button-layout: 1}")

class UnreadableMessageBox(QMessageBox):
    """
    Message box to warn the user that the chosen file cannot be opened.
    """

    def __init__(self, fileName):
        super().__init__()

        self.setIcon(QMessageBox.Information)
        self.setWindowTitle(f"File \"{fileName}\" cannot be opened")
        self.setText("The file you have selected cannot be opened.")
        self.setInformativeText("Please make sure it is in the right format.")
        self.setStandardButtons(QMessageBox.Ok)
        self.setDefaultButton(QMessageBox.Ok)


class ChordNameWarningMessageBox(QMessageBox):
    """
    Message box to warn the user that a chord must have a name
    """

    def __init__(self):
        super().__init__()

        self.setIcon(QMessageBox.Information)
        self.setWindowTitle("Unnamed chord")
        self.setText("Chords must have a name.")
        self.setInformativeText("Please give your chord a name and try again.")
        self.setStandardButtons(QMessageBox.Ok)
        self.setDefaultButton(QMessageBox.Ok)


class SectionNameWarningMessageBox(QMessageBox):
    """
    Message box to warn the user that a section must have a name
    """

    def __init__(self):
        super().__init__()

        self.setIcon(QMessageBox.Information)
        self.setWindowTitle("Unnamed section")
        self.setText("Sections must have a unique name.")
        self.setInformativeText(
            "Please give your section a unique name and try again.")
        self.setStandardButtons(QMessageBox.Ok)
        self.setDefaultButton(QMessageBox.Ok)


class BlockMustHaveSectionWarningMessageBox(QMessageBox):
    """
    Message box to warn the user that a block must belong to a section
    """

    def __init__(self):
        super().__init__()

        self.setIcon(QMessageBox.Information)
        self.setWindowTitle("No sections found")
        self.setText("Each block must belong to a section, but no sections have yet been created.")
        self.setInformativeText(
            "Please create a section before adding blocks.")
        self.setStandardButtons(QMessageBox.Ok)
        self.setDefaultButton(QMessageBox.Ok)


class VoicingWarningMessageBox(QMessageBox):
    """
    Message box to warn the user that the voicing entered could not be parsed
    """

    def __init__(self):
        super().__init__()

        self.setIcon(QMessageBox.Information)
        self.setWindowTitle("Malformed voicing")
        self.setText(
            "The voicing you entered was not understood and has not been applied.")
        self.setInformativeText(
            "Please try re-entering it in the correct format.")
        self.setStandardButtons(QMessageBox.Ok)
        self.setDefaultButton(QMessageBox.Ok)


class LengthWarningMessageBox(QMessageBox):
    """
    Message box to warn the user that a block must have a length
    """

    def __init__(self):
        super().__init__()

        self.setIcon(QMessageBox.Information)
        self.setWindowTitle("Block without valid length")
        self.setText("Blocks must have a length.")
        self.setInformativeText(
            "Please enter a valid length for your block and try again.")
        self.setStandardButtons(QMessageBox.Ok)
        self.setDefaultButton(QMessageBox.Ok)