# coding:utf-8
from PyQt5.QtCore import Qt, pyqtSignal, QPoint, QRegExp, QSize
from PyQt5.QtGui import (QBrush, QColor, QPixmap,
                         QPainter, QPen, QIntValidator, QRegExpValidator, QIcon)
from PyQt5.QtWidgets import QApplication, QLabel, QWidget, QPushButton, QFrame, QVBoxLayout

from ...common.style_sheet import FluentStyleSheet, isDarkTheme
from ..widgets import ClickableSlider, SingleDirectionScrollArea, PushButton, PrimaryPushButton
from ..widgets.line_edit import LineEdit
from .mask_dialog_base import MaskDialogBase


class HuePanel(QWidget):
    """ Hue panel """

    colorChanged = pyqtSignal(QColor)

    def __init__(self, color=QColor(255, 0, 0), parent=None):
        super().__init__(parent=parent)
        self.setFixedSize(256, 256)
        self.huePixmap = QPixmap(":/qfluentwidgets/images/color_dialog/HuePanel.png")
        self.setColor(color)

    def mousePressEvent(self, e):
        self.setPickerPosition(e.pos())

    def mouseMoveEvent(self, e):
        self.setPickerPosition(e.pos())

    def setPickerPosition(self, pos):
        """ set the position of  """
        self.pickerPos = pos
        self.color.setHsv(
            int(max(0, min(1, pos.x() / self.width())) * 359),
            int(max(0, min(1, (self.height() - pos.y()) / self.height())) * 255),
            255
        )
        self.update()
        self.colorChanged.emit(self.color)

    def setColor(self, color):
        """ set color """
        self.color = QColor(color)
        self.color.setHsv(self.color.hue(), self.color.saturation(), 255)
        self.pickerPos = QPoint(
            int(self.hue/359*self.width()),
            int((255 - self.saturation)/255*self.height())
        )
        self.update()

    @property
    def hue(self):
        return self.color.hue()

    @property
    def saturation(self):
        return self.color.saturation()

    def paintEvent(self, e):
        painter = QPainter(self)
        painter.setRenderHints(QPainter.Antialiasing |
                               QPainter.SmoothPixmapTransform)

        # draw hue panel
        painter.setBrush(QBrush(self.huePixmap))
        painter.setPen(QPen(QColor(0, 0, 0, 15), 2.4))
        painter.drawRoundedRect(self.rect(), 5.6, 5.6)

        # draw picker
        if self.saturation > 153 or 40 < self.hue < 180:
            color = Qt.black
        else:
            color = QColor(255, 253, 254)

        painter.setPen(QPen(color, 3))
        painter.setBrush(Qt.NoBrush)
        painter.drawEllipse(self.pickerPos.x() - 8,
                            self.pickerPos.y() - 8, 16, 16)


class BrightnessSlider(ClickableSlider):
    """ Brightness slider """

    colorChanged = pyqtSignal(QColor)

    def __init__(self, color, parent=None):
        super().__init__(Qt.Horizontal, parent)
        self.setRange(0, 255)
        self.setSingleStep(1)
        self.setColor(color)
        self.valueChanged.connect(self.__onValueChanged)

    def setColor(self, color):
        """ set color """
        self.color = QColor(color)
        self.setValue(self.color.value())
        qss = FluentStyleSheet.COLOR_DIALOG.content()
        qss = qss.replace('--slider-hue', str(self.color.hue()))
        qss = qss.replace('--slider-saturation', str(self.color.saturation()))
        self.setStyleSheet(qss)

    def __onValueChanged(self, value):
        """ slider value changed slot """
        self.color.setHsv(self.color.hue(), self.color.saturation(), value, self.color.alpha())
        self.setColor(self.color)
        self.colorChanged.emit(self.color)


class ColorCard(QWidget):
    """ Color card """

    def __init__(self, color, parent=None, enableAlpha=False):
        super().__init__(parent)
        self.setFixedSize(44, 128)
        self.setColor(color)
        self.enableAlpha = enableAlpha
        self.titledPixmap = self._createTitledBackground()

    def _createTitledBackground(self):
        pixmap = QPixmap(8, 8)
        pixmap.fill(Qt.transparent)
        painter = QPainter(pixmap)

        c = 255 if isDarkTheme() else 0
        color = QColor(c, c, c, 26)
        painter.fillRect(4, 0, 4, 4, color)
        painter.fillRect(0, 4, 4, 4, color)
        painter.end()
        return pixmap

    def setColor(self, color):
        """ set the color of card """
        self.color = QColor(color)
        self.update()

    def paintEvent(self, e):
        painter = QPainter(self)
        painter.setRenderHints(QPainter.Antialiasing)

        # draw tiled background
        if self.enableAlpha:
            painter.setBrush(QBrush(self.titledPixmap))
            painter.setPen(QColor(0, 0, 0, 13))
            painter.drawRoundedRect(self.rect(), 4, 4)

        # draw color
        painter.setBrush(self.color)
        painter.setPen(QColor(0, 0, 0, 13))
        painter.drawRoundedRect(self.rect(), 4, 4)


class ColorLineEdit(LineEdit):
    """ Color line edit """

    valueChanged = pyqtSignal(str)

    def __init__(self, value, parent=None):
        super().__init__(parent)
        self.setText(str(value))
        self.setFixedSize(136, 33)
        self.setClearButtonEnabled(True)
        self.setValidator(QIntValidator(0, 255, self))

        self.textEdited.connect(self._onTextEdited)

    def _onTextEdited(self, text):
        """ text edited slot """
        state = self.validator().validate(text, 0)[0]
        if state == QIntValidator.Acceptable:
            self.valueChanged.emit(text)


class HexColorLineEdit(ColorLineEdit):
    """ Hex color line edit """

    def __init__(self, color, parent=None, enableAlpha=False):
        self.colorFormat = QColor.HexArgb if enableAlpha else QColor.HexRgb
        super().__init__(QColor(color).name(self.colorFormat)[1:], parent)

        if enableAlpha:
            self.setValidator(QRegExpValidator(QRegExp(r'[A-Fa-f0-9]{8}')))
        else:
            self.setValidator(QRegExpValidator(QRegExp(r'[A-Fa-f0-9]{6}')))

        self.setTextMargins(4, 0, 33, 0)
        self.prefixLabel = QLabel('#', self)
        self.prefixLabel.move(7, 2)
        self.prefixLabel.setObjectName('prefixLabel')

    def setColor(self, color):
        """ set color """
        self.setText(color.name(self.colorFormat)[1:])


class OpacityLineEdit(ColorLineEdit):
    """ Opacity line edit """

    def __init__(self, value, parent=None, enableAlpha=False):
        super().__init__(int(value/255*100), parent)
        self.setValidator(QRegExpValidator(QRegExp(r'[0-9][0-9]{0,1}|100')))
        self.setTextMargins(4, 0, 33, 0)
        self.suffixLabel = QLabel('%', self)
        self.suffixLabel.setObjectName('suffixLabel')
        self.textChanged.connect(self._adjustSuffixPos)

    def showEvent(self, e):
        super().showEvent(e)
        self._adjustSuffixPos()

    def _adjustSuffixPos(self):
        x = self.fontMetrics().width(self.text()) + 18
        self.suffixLabel.move(x, 2)


class ColorDialog(MaskDialogBase):
    """ Color dialog """

    colorChanged = pyqtSignal(QColor)

    def __init__(self, color, title: str, parent=None, enableAlpha=False):
        """
        Parameters
        ----------
        color: `QColor` | `GlobalColor` | str
            initial color

        title: str
            the title of dialog

        parent: QWidget
            parent widget

        enableAlpha: bool
            whether to enable the alpha channel
        """
        super().__init__(parent)
        self.enableAlpha = enableAlpha
        if not enableAlpha:
            color = QColor(color)
            color.setAlpha(255)

        self.oldColor = QColor(color)
        self.color = QColor(color)

        self.scrollArea = SingleDirectionScrollArea(self.widget)
        self.scrollWidget = QWidget(self.scrollArea)

        self.buttonGroup = QFrame(self.widget)
        self.yesButton = PrimaryPushButton(self.tr('OK'), self.buttonGroup)
        self.cancelButton = QPushButton(self.tr('Cancel'), self.buttonGroup)

        self.titleLabel = QLabel(title, self.scrollWidget)
        self.huePanel = HuePanel(color, self.scrollWidget)
        self.newColorCard = ColorCard(color, self.scrollWidget, enableAlpha)
        self.oldColorCard = ColorCard(color, self.scrollWidget, enableAlpha)
        self.brightSlider = BrightnessSlider(color, self.scrollWidget)

        self.editLabel = QLabel(self.tr('Edit Color'), self.scrollWidget)
        self.redLabel = QLabel(self.tr('Red'), self.scrollWidget)
        self.blueLabel = QLabel(self.tr('Blue'), self.scrollWidget)
        self.greenLabel = QLabel(self.tr('Green'), self.scrollWidget)
        self.opacityLabel = QLabel(self.tr('Opacity'), self.scrollWidget)
        self.hexLineEdit = HexColorLineEdit(color, self.scrollWidget, enableAlpha)
        self.redLineEdit = ColorLineEdit(self.color.red(), self.scrollWidget)
        self.greenLineEdit = ColorLineEdit(self.color.green(), self.scrollWidget)
        self.blueLineEdit = ColorLineEdit(self.color.blue(), self.scrollWidget)
        self.opacityLineEdit = OpacityLineEdit(self.color.alpha(), self.scrollWidget)

        self.vBoxLayout = QVBoxLayout(self.widget)

        self.__initWidget()

    def __initWidget(self):
        self.scrollArea.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.scrollArea.setViewportMargins(48, 24, 0, 24)
        self.scrollArea.setWidget(self.scrollWidget)

        self.widget.setMaximumSize(488, 696+40*self.enableAlpha)
        self.widget.resize(488, 696+40*self.enableAlpha)
        self.scrollWidget.resize(440, 560+40*self.enableAlpha)
        self.buttonGroup.setFixedSize(486, 81)
        self.yesButton.setFixedWidth(216)
        self.cancelButton.setFixedWidth(216)

        self.setShadowEffect(60, (0, 10), QColor(0, 0, 0, 80))
        self.setMaskColor(QColor(0, 0, 0, 76))

        self.__setQss()
        self.__initLayout()
        self.__connectSignalToSlot()

    def __initLayout(self):
        self.huePanel.move(0, 46)
        self.newColorCard.move(288, 46)
        self.oldColorCard.move(288, self.newColorCard.geometry().bottom()+1)
        self.brightSlider.move(0, 324)

        self.editLabel.move(0, 385)
        self.redLineEdit.move(0, 426)
        self.greenLineEdit.move(0, 470)
        self.blueLineEdit.move(0, 515)
        self.redLabel.move(144, 434)
        self.greenLabel.move(144, 478)
        self.blueLabel.move(144, 524)
        self.hexLineEdit.move(196, 381)

        if self.enableAlpha:
            self.opacityLineEdit.move(0, 560)
            self.opacityLabel.move(144, 567)
        else:
            self.opacityLineEdit.hide()
            self.opacityLabel.hide()

        self.vBoxLayout.setSpacing(0)
        self.vBoxLayout.setAlignment(Qt.AlignTop)
        self.vBoxLayout.setContentsMargins(0, 0, 0, 0)
        self.vBoxLayout.addWidget(self.scrollArea, 1)
        self.vBoxLayout.addWidget(self.buttonGroup, 0, Qt.AlignBottom)

        self.yesButton.move(24, 25)
        self.cancelButton.move(250, 25)

    def __setQss(self):
        self.editLabel.setObjectName('editLabel')
        self.titleLabel.setObjectName('titleLabel')
        self.yesButton.setObjectName('yesButton')
        self.cancelButton.setObjectName('cancelButton')
        self.buttonGroup.setObjectName('buttonGroup')
        FluentStyleSheet.COLOR_DIALOG.apply(self)
        self.titleLabel.adjustSize()
        self.editLabel.adjustSize()

    def setColor(self, color, movePicker=True):
        """ set color """
        self.color = QColor(color)
        self.brightSlider.setColor(color)
        self.newColorCard.setColor(color)
        self.hexLineEdit.setColor(color)
        self.redLineEdit.setText(str(color.red()))
        self.blueLineEdit.setText(str(color.blue()))
        self.greenLineEdit.setText(str(color.green()))
        if movePicker:
            self.huePanel.setColor(color)

    def __onHueChanged(self, color):
        """ hue changed slot """
        self.color.setHsv(
            color.hue(), color.saturation(), self.color.value(), self.color.alpha())
        self.setColor(self.color)

    def __onBrightnessChanged(self, color):
        """ brightness changed slot """
        self.color.setHsv(
            self.color.hue(), self.color.saturation(), color.value(), color.alpha())
        self.setColor(self.color, False)

    def __onRedChanged(self, red):
        """ red channel changed slot """
        self.color.setRed(int(red))
        self.setColor(self.color)

    def __onBlueChanged(self, blue):
        """ blue channel changed slot """
        self.color.setBlue(int(blue))
        self.setColor(self.color)

    def __onGreenChanged(self, green):
        """ green channel changed slot """
        self.color.setGreen(int(green))
        self.setColor(self.color)

    def __onOpacityChanged(self, opacity):
        """ opacity channel changed slot """
        self.color.setAlpha(int(int(opacity)/100*255))
        self.setColor(self.color)

    def __onHexColorChanged(self, color):
        """ hex color changed slot """
        self.color.setNamedColor("#" + color)
        self.setColor(self.color)

    def __onYesButtonClicked(self):
        """ yes button clicked slot """
        self.accept()
        if self.color != self.oldColor:
            self.colorChanged.emit(self.color)

    def updateStyle(self):
        """ update style sheet """
        self.setStyle(QApplication.style())
        self.titleLabel.adjustSize()
        self.editLabel.adjustSize()
        self.redLabel.adjustSize()
        self.greenLabel.adjustSize()
        self.blueLabel.adjustSize()
        self.opacityLabel.adjustSize()

    def showEvent(self, e):
        self.updateStyle()
        super().showEvent(e)

    def __connectSignalToSlot(self):
        """ connect signal to slot """
        self.cancelButton.clicked.connect(self.reject)
        self.yesButton.clicked.connect(self.__onYesButtonClicked)

        self.huePanel.colorChanged.connect(self.__onHueChanged)
        self.brightSlider.colorChanged.connect(self.__onBrightnessChanged)

        self.redLineEdit.valueChanged.connect(self.__onRedChanged)
        self.blueLineEdit.valueChanged.connect(self.__onBlueChanged)
        self.greenLineEdit.valueChanged.connect(self.__onGreenChanged)
        self.hexLineEdit.valueChanged.connect(self.__onHexColorChanged)
        self.opacityLineEdit.valueChanged.connect(self.__onOpacityChanged)
