"""SkeletonApp."""
# from PyQt6 import Qt

from PyQt6 import QtGui
from PyQt6 import QtCore
from PyQt6 import QtWidgets

from PyQt6.QtWidgets import QApplication, QSizePolicy, QDialog, QMenu
from PyQt6.QtWidgets import QMainWindow
from PyQt6.QtWidgets import QWidget


# include <QToolBar>
from PyQt6.QtWidgets import QToolBar

# include <QIcon>
from PyQt6.QtGui import QIcon, QPalette, QGuiApplication, QImage, QPixmap, qRed, qGreen, qBlue, qAlpha, qRgba, QAction, QKeySequence, qRgb

# include <QClipboard>
from PyQt6.QtGui import QClipboard

# include <QColorSpace>
from PyQt6.QtGui import QColorSpace

# include <QDir>
from PyQt6.QtCore import QDir, QTranslator, Qt

# include <QFileDialog>
from PyQt6.QtWidgets import QFileDialog

# include <QImageReader>
from PyQt6.QtGui import QImageReader

# include <QImageWriter>
from PyQt6.QtGui import QImageWriter

# include <QBuffer>
from PyQt6.QtCore import QBuffer

# include <QLabel>
from PyQt6.QtWidgets import QLabel

# include <QMenuBar>
from PyQt6.QtWidgets import QMenuBar

# include <QMessageBox>
from PyQt6.QtWidgets import QMessageBox

# include <QMimeData>
from PyQt6.QtCore import QMimeData

# include <QPainter>
from PyQt6.QtGui import QPainter

# include <QScreen>
from PyQt6.QtGui import QScreen

# include <QScrollArea>
from PyQt6.QtWidgets import QScrollArea

# include <QScrollBar>
from PyQt6.QtWidgets import QScrollBar

# include <QStandardPaths>
from PyQt6.QtCore import QStandardPaths

# include <QStatusBar>
from PyQt6.QtWidgets import QStatusBar


from io import BytesIO
# include <iostream>

from io import FileIO
# include <fstream>

#
# class ScrollArea:
#     """Scroll area."""
#     def __init__(self, scroll_area=QScrollArea()):
#         pass
#
#
# class ImageLabel:
#     """Image label."""
#     def __init__(self, image_label=QLabel()):
#         pass


class SkeletonApp(QMainWindow):
    """SkeletonApp."""

    firstDialog = None

    def __init__(self, parent=None):
        super(SkeletonApp, self).__init__(parent)

        self.image_label = QLabel()
        self.image_label.setBackgroundRole(QPalette.ColorRole.Base)
        self.image_label.setSizePolicy(QSizePolicy.Policy.Ignored, QSizePolicy.Policy.Ignored)

        self.image_label.setScaledContents(True)

        self.scroll_area = QScrollArea()
        self.scroll_area.setBackgroundRole(QPalette.ColorRole.Dark)
        self.scroll_area.setWidget(self.image_label)
        self.scroll_area.setVisible(False)
        self.setCentralWidget(self.scroll_area)

        self.resize(QGuiApplication.primaryScreen().availableSize() * 3 / 5)

        self.fileMenu: QMenu = self.menuBar().addMenu(self.tr("&File"))
        self.editMenu: QMenu = self.menuBar().addMenu(self.tr("&Edit"))
        self.viewMenu: QMenu = self.menuBar().addMenu(self.tr("&View"))
        self.helpMenu: QMenu = self.menuBar().addMenu(self.tr("&Help"))
        self.filtersMenu: QMenu = self.menuBar().addMenu(self.tr("&Filters"))

        self.data = []
        self.reader = None
        self.pixmap = QPixmap()
        self.image = self.pixmap.toImage()
        self.bit_planes = 0
        self.depth = 0
        self.format = None
        self.bytes_per_line = 0
        self.nbChannels = 1
        self.nbRealChannels = 1
        self.pixel = None
        self.row = []

        self.image_width = 0
        self.image_height = 0
        self.translator = QTranslator(self)
        self.scaleFactor = 1.0

        self.pictures_locations = None
        self.mimeTypeFilters = []
        self.dataResult = []

        self.createActions()
        self.updateActions()

    def loadFile(self, file_name: str):
        """Load file."""
        self.data.clear()
        self.reader = QImageReader(file_name)
        self.reader.setAutoTransform(True)

        # const
        _new_image: QImage = self.reader.read()

        if _new_image.isNull():
            QMessageBox.information(
                self, QGuiApplication.applicationDisplayName(),
                self.tr(F"Cannot load {QDir.toNativeSeparators(file_name)}:{self.reader.errorString()}"))
            return False

        self.filtersMenu.setDisabled(False)

        self.setImage(new_image=_new_image)

        self.image_width = self.image.width()
        self.image_height = self.image.height()
        self.bit_planes = int(self.image.bitPlaneCount())
        self.depth = int(self.image.depth())
        self.format = self.image.format()
        print(type(self.format))

        self.bytes_per_line = int(self.image.bytesPerLine())
        self.nbChannels = 1

        if self.depth > 1:
            self.nbChannels = self.depth / 8

        self.nbRealChannels = 1
        if self.bit_planes > 1:
            self.nbRealChannels = self.bit_planes / 8

        file = open("test_zapisu.txt", 'w')

        if file:
            for i in range(self.image_height):
                row = []
                for j in range(self.image_width):
                    # działa w logice pixel(x,y) - najpierw specyfikuje kolumnę
                    impix: qRgb = self.image.pixel(j, i)

                    pixel = []

                    if self.nbChannels == 1:
                        pixel = [qRed(impix)]
                        file.writelines(str(pix) + " " for pix in pixel)

                    elif self.nbChannels == 3:
                        pixel = [qRed(impix), qGreen(impix), qBlue(impix)]
                        file.writelines(str(pix) + " " for pix in pixel)

                    elif self.nbChannels == 4:
                        pixel = [qRed(impix), qGreen(impix), qBlue(impix), qAlpha(impix)]
                        file.writelines(str(pix) + " " for pix in pixel)

                    file.write("\n")
                    row.append(pixel)

                self.data.append(row)

            file.close()

        self.setWindowFilePath(file_name)

        message = self.tr(f"Opened \"{QDir.toNativeSeparators(file_name)}\", {self.image.width()}x{self.image.height()}, Depth: {self.image.depth()}, "
                          f"Bit planes: {self.image.bitPlaneCount()}")

        self.statusBar().showMessage(message)
        return True

    def setImage(self, new_image: QImage):
        """Set image."""
        self.image = new_image
        if self.image.colorSpace().isValid():
            self.image.convertToColorSpace(QColorSpace(QColorSpace.NamedColorSpace.SRgb))

        self.image_label.setPixmap(QPixmap.fromImage(self.image))
        self.scaleFactor = 1.0
        self.scroll_area.setVisible(True)
        # self.printAct.setEnabled(True)
        self.fitToWindowAct.setEnabled(True)
        self.updateActions()

        if not self.fitToWindowAct.isChecked():
            self.image_label.adjustSize()

    def scaleImage(self, factor: float):
        """Scale image."""
        self.scaleFactor *= factor

        self.image_label.resize(self.scaleFactor * self.image_label.pixmap().width(),
                                self.scaleFactor * self.image_label.pixmap().height())

        self.adjustScrollBar(self.scroll_area.horizontalScrollBar(), factor)
        self.adjustScrollBar(self.scroll_area.verticalScrollBar(), factor)

        self.zoomInAct.setEnabled(self.scaleFactor < 3.0)
        self.zoomOutAct.setEnabled(self.scaleFactor > 0.333)

    def adjustScrollBar(self, scroll_bar: QScrollBar, factor: float):
        """adjust scroll bar"""
        scroll_bar.setValue(int(factor * scroll_bar.value() + ((factor - 1) * scroll_bar.pageStep() / 2)))

    def about(self):
        """about"""
        QMessageBox.about(self, self.tr("About skeletonApp"),
                          self.tr("<p>Aplikacja<b> szkieletowa</b> do kursu <i>Przetwarzanie obrazu</i></p>"))

    def saveFile(self, file_name: str):
        """Save."""
        writer = QImageWriter(file_name)

        if not writer.write(self.image):
            QMessageBox.information(
                self, QGuiApplication.applicationDisplayName(),
                self.tr(F"Cannot write {QDir.toNativeSeparators(file_name)}: {writer.errorString()}"))

            return False

        message = self.tr(f"Wrote \"{QDir.toNativeSeparators(file_name)}\"")
        self.statusBar().showMessage(message)
        return True

    def initializeImageFileDialog(self, dialog, acceptMode):
        """Initialize Image File Dialog."""
        self.firstDialog = True

        if self.firstDialog:
            self.firstDialog = False
            self.pictures_locations: list = QStandardPaths.standardLocations(QStandardPaths.StandardLocation.PicturesLocation)

            dialog.setDirectory(QDir.currentPath() if not self.pictures_locations else self.pictures_locations[-1])

        self.mimeTypeFilters = []
        supported_mime_types = None
        if acceptMode == QFileDialog.AcceptMode.AcceptOpen:
            supported_mime_types = QImageReader.supportedMimeTypes().__str__()
        else:
            supported_mime_types = QImageWriter.supportedMimeTypes().__str__()

        for mime_type_name in supported_mime_types:
            self.mimeTypeFilters.append(mime_type_name)

        self.mimeTypeFilters.sort()

        dialog.setMimeTypeFilters(self.mimeTypeFilters)
        dialog.selectMimeTypeFilter("image/x-portable-pixmap")
        if acceptMode == QFileDialog.AcceptMode.AcceptSave:
            dialog.setDefaultSuffix("ppm")

    def open(self):
        """Open file"""
        dialog = QFileDialog(self, self.tr("Open File"))
        self.initializeImageFileDialog(dialog, QFileDialog.AcceptMode.AcceptOpen)
        dialog.exec()
        if dialog.accepted:
            self.loadFile(dialog.selectedFiles()[0])

    def saveAs(self):
        """Save file"""
        dialog = QFileDialog(self, self.tr("Save File As"))
        self.initializeImageFileDialog(dialog, QFileDialog.AcceptMode.AcceptSave)
        dialog.exec()
        if dialog.accepted:
            self.saveFile(dialog.selectedFiles()[0])

    def copy(self):
        """Copy image"""
        QGuiApplication.clipboard().setImage(self.image)

    def clipboardImage(self) -> QImage:
        """Clipboard Image"""
        mimeData: QMimeData = QGuiApplication.clipboard().mimeData()
        if mimeData:
            if mimeData.hasImage():
                image: QImage = QImage(mimeData.imageData())
                if not image.isNull():
                    return image
        return QImage()

    def paste(self):
        """Paste image."""
        newImage: QImage = self.clipboardImage()
        if newImage.isNull():
            self.statusBar().showMessage(self.tr("No image in clipboard"))

        else:
            self.setImage(newImage)
            self.setWindowFilePath(str(''))
            message: str = self.tr(
                f"Obtained image from clipboard, {newImage.width()}x{newImage.height()}, Depth: {newImage.depth()}")
            self.statusBar().showMessage(message)

    def zoomIn(self):
        """Zoom in"""
        self.scaleImage(1.25)

    def zoomOut(self):
        """Zoom out"""
        self.scaleImage(0.8)

    def normalSize(self):
        """Normalize Size"""
        self.image_label.adjustSize()
        self.scaleFactor = 1.0

    def fitToWindow(self):
        """Fit to window"""
        fit: bool = self.fitToWindowAct.isChecked()
        print(fit)
        self.scroll_area.setWidgetResizable(fit)
        if not fit:
            self.normalSize()
        self.updateActions()

    def applyTestFilter(self):
        """Apply test filter"""
        self.dataResult.clear()

        for i in range(0, self.height()):
            row = [[]]

            for j in range(0, self.width()):
                pixel = []

                for k in range(0, self.nbRealChannels):
                    print(self.nbChannels)
                    print(i, j, k)
                    pixel.append(255 - int(self.data[i][j][k]))

                if self.nbRealChannels < self.nbChannels:
                    pixel.append(255)

                row.append(pixel)

            self.dataResult.append(row)

        imageResult = QImage(width=self.width(), height=self.height(), format=self.image.format())

        if self.nbChannels > 1:
            for i in range(0, self.image.height()):
                for j in range(0, self.image.width()):
                    imageResult.setPixel(
                        j, i, qRgba(self.dataResult[i][j][0], self.dataResult[i][j][1],
                                    self.dataResult[i][j][2], self.dataResult[i][j][3]))
        else:
            if self.image.bitPlaneCount() == 8:
                for i in range(0, self.image.height()):
                    for j in range(0, self.image.width()):
                        imageResult.setPixel(
                            j, i, qRgba(self.dataResult[i][j][0], self.dataResult[i][j][0],
                                        self.dataResult[i][j][0], 255))
            else:
                imageResult.setColorCount(2)
                imageResult.setColor(0, qRgba(0, 0, 0, 255))
                imageResult.setColor(1, qRgba(255, 0, 0, 0))

                for i in range(0, self.image.height()):
                    for j in range(0, self.image.width()):
                        if self.dataResult[i][j][0] == 0:
                            imageResult.setPixel(j, i, 0)
                        else:
                            imageResult.setPixel(j, i, 1)

        self.setImage(imageResult)
        
    def updateActions(self):
        """update actions"""
        self.saveAsAct.setEnabled(not self.image.isNull())
        self.copyAct.setEnabled(not self.image.isNull())
        self.zoomInAct.setEnabled(not self.fitToWindowAct.isChecked())
        self.zoomOutAct.setEnabled(not self.fitToWindowAct.isChecked())
        self.normalSizeAct.setEnabled(not self.fitToWindowAct.isChecked())

    def createActions(self):
        """Create actions."""
        self.openAct = QAction(self.tr("&Open..."), self)
        self.openAct.triggered.connect(self.open)
        self.openAct.setShortcut(QKeySequence.StandardKey.Open)
        self.fileMenu.addAction(self.openAct)

        self.saveAsAct = QAction(self.tr("&Save As..."), self)
        self.saveAsAct.triggered.connect(self.saveAs)
        self.saveAsAct.setShortcut(self.tr("Shift+S"))
        self.fileMenu.addAction(self.saveAsAct)

        self.fileMenu.addSeparator()

        self.exitAct = QAction(self.tr("&Exit"), self)
        self.exitAct.triggered.connect(QWidget.close)
        self.exitAct.setShortcut(self.tr("Ctrl+Q"))
        self.fileMenu.addAction(self.exitAct)

        self.copyAct = QAction(self.tr("&Copy"), self)
        self.copyAct.triggered.connect(self.copy)
        self.copyAct.setShortcut(QKeySequence.StandardKey.Copy)
        self.editMenu.addAction(self.copyAct)

        self.pasteAct = QAction(self.tr("&Paste"), self)
        self.pasteAct.triggered.connect(self.paste)
        self.pasteAct.setShortcut(QKeySequence.StandardKey.Paste)
        self.editMenu.addAction(self.pasteAct)

        self.zoomInAct = QAction(self.tr("&Zoom In (25%)"), self)
        self.zoomInAct.triggered.connect(self.zoomIn)
        self.zoomInAct.setShortcut(QKeySequence.StandardKey.ZoomIn)
        self.viewMenu.addAction(self.zoomInAct)

        self.zoomOutAct = QAction(self.tr("&Zoom Out (25%)"), self)
        self.zoomOutAct.triggered.connect(self.zoomOut)
        self.zoomOutAct.setShortcut(QKeySequence.StandardKey.ZoomOut)
        self.viewMenu.addAction(self.zoomOutAct)

        self.normalSizeAct = QAction(self.tr("&Normal Size"), self)
        self.normalSizeAct.triggered.connect(self.normalSize)
        self.normalSizeAct.setShortcut(self.tr("Ctrl+N"))
        self.viewMenu.addAction(self.normalSizeAct)

        self.fitToWindowAct = QAction(self.tr("&Fit to Window"), self)
        self.fitToWindowAct.triggered.connect(self.fitToWindow)
        self.fitToWindowAct.setShortcut(self.tr("Ctrl+F"))
        self.viewMenu.addAction(self.fitToWindowAct)

        self.testFilterAct = QAction(self.tr("&TestFilter"), self)
        self.testFilterAct.triggered.connect(self.applyTestFilter)
        self.filtersMenu.addAction(self.testFilterAct)

        self.aboutAct = QAction(self.tr("&About"), self)
        self.aboutAct.triggered.connect(self.about)
        self.aboutAct.setShortcut(self.tr("Ctrl+I"))
        self.helpMenu.addAction(self.aboutAct)

        self.fitToWindowAct.setCheckable(True)
        self.filtersMenu.setDisabled(True)
        # self.testFilter.setDisabled(True)
        self.saveAsAct.setEnabled(False)
        self.copyAct.setEnabled(False)
        self.zoomInAct.setEnabled(False)
        self.zoomOutAct.setEnabled(False)
        self.normalSizeAct.setEnabled(False)
        self.fitToWindowAct.setEnabled(False)
        self.aboutAct.setEnabled(True)