# type: ignore
# pylint: skip-file
"""
Code largely based on https://github.com/rsgalloway/QRangeSlider

==================================================================================

Copyright (c) 2011-2012, Ryan Galloway (http://rsgalloway.com)
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

	* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
	* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
	* Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""
import typing


import sys
from PySide6 import QtCore, QtGui, QtWidgets
__all__ = ['QRangeSlider']



def scale(val, src, dst):
	return int(((val - src[0]) / float(src[1]-src[0])) * (dst[1]-dst[0]) + dst[0])

DEFAULT_CSS = """
QRangeSlider * {
	border: 0px;
	padding: 0px;
}
QRangeSlider #Head {
	background: #222;
}
QRangeSlider #Span {
	background: #393;
}
QRangeSlider #Span:active {
	background: #282;
}
QRangeSlider #Tail {
	background: #222;
}
QRangeSlider > QSplitter::handle {
	background: #393;
}
QRangeSlider > QSplitter::handle:vertical {
	height: 4px;
}
QRangeSlider > QSplitter::handle:pressed {
	background: #ca5;
}
"""


class Ui_Form(object):
	def setupUi(self, Form):
		Form.setObjectName("QRangeSlider")
		Form.resize(300, 30)
		Form.setStyleSheet(DEFAULT_CSS)
		self.gridLayout = QtWidgets.QGridLayout(Form)
		self.gridLayout.setContentsMargins(0, 0, 0, 0)
		self.gridLayout.setSpacing(0)
		self.gridLayout.setObjectName("gridLayout")
		self._splitter = QtWidgets.QSplitter(Form)
		self._splitter.setMinimumSize(QtCore.QSize(0, 15))
		self._splitter.setMaximumSize(QtCore.QSize(16777215, 16777215))
		self._splitter.setOrientation(QtCore.Qt.Orientation.Horizontal)
		self._splitter.setObjectName("splitter")
		self._head = QtWidgets.QGroupBox(self._splitter)
		self._head.setTitle("")
		self._head.setObjectName("Head")
		self._handle = QtWidgets.QGroupBox(self._splitter)
		self._handle.setTitle("")
		self._handle.setObjectName("Span")
		self._tail = QtWidgets.QGroupBox(self._splitter)
		self._tail.setTitle("")
		self._tail.setObjectName("Tail")
		self.gridLayout.addWidget(self._splitter, 0, 0, 1, 1)
		self.retranslateUi(Form)
		QtCore.QMetaObject.connectSlotsByName(Form)

	def retranslateUi(self, Form):
		_translate = QtCore.QCoreApplication.translate
		Form.setWindowTitle(_translate("QRangeSlider", "QRangeSlider"))


class Element(QtWidgets.QGroupBox):
	def __init__(self, parent, main):
		super(Element, self).__init__(parent)
		self.main = main

	def setStyleSheet(self, style):
		self.parent().setStyleSheet(style)

	def textColor(self):
		return getattr(self, '__textColor', QtGui.QColor(125, 125, 125))

	def setTextColor(self, color):
		if type(color) == tuple and len(color) == 3:
			color = QtGui.QColor(color[0], color[1], color[2])
		elif type(color) == int:
			color = QtGui.QColor(color, color, color)
		setattr(self, '__textColor', color)

	def paintEvent(self, event):
		qp = QtGui.QPainter()
		qp.begin(self)
		if self.main.drawValues():
			self.drawText(event, qp)
		qp.end()


class Head(Element):
	def __init__(self, parent, main):
		super(Head, self).__init__(parent, main)

	def drawText(self, event, qp):
		qp.setPen(self.textColor())
		qp.setFont(QtGui.QFont('Arial', 10))
		qp.drawText(event.rect(), QtCore.Qt.AlignLeft, str(self.main.min()))


class Tail(Element):
	def __init__(self, parent, main):
		super(Tail, self).__init__(parent, main)

	def drawText(self, event, qp):
		qp.setPen(self.textColor())
		qp.setFont(QtGui.QFont('Arial', 10))
		qp.drawText(event.rect(), QtCore.Qt.AlignRight, str(self.main.max()))


class Handle(Element):
	def __init__(self, parent, main):
		super(Handle, self).__init__(parent, main)

	def drawText(self, event, qp):
		qp.setPen(self.textColor())
		qp.setFont(QtGui.QFont('Arial', 10))
		qp.drawText(event.rect(), QtCore.Qt.AlignLeft, str(self.main.start()))
		qp.drawText(event.rect(), QtCore.Qt.AlignRight, str(self.main.end()))

	def mouseMoveEvent(self, event):
		event.accept()
		mx = event.globalX()
		_mx = getattr(self, '__mx', None)
		if not _mx:
			setattr(self, '__mx', mx)
			dx = 0
		else:
			dx = mx - _mx
		setattr(self, '__mx', mx)
		if dx == 0:
			event.ignore()
			return
		elif dx > 0:
			dx = 1
		elif dx < 0:
			dx = -1
		s = self.main.start() + dx
		e = self.main.end() + dx
		if s >= self.main.min() and e <= self.main.max():
			self.main.setRange(s, e)


class QRangeSlider(QtWidgets.QWidget, Ui_Form):
	endValueChanged = QtCore.Signal(int)
	maxValueChanged = QtCore.Signal(int)
	minValueChanged = QtCore.Signal(int)
	startValueChanged = QtCore.Signal(int)
	minValueChanged = QtCore.Signal(int)
	maxValueChanged = QtCore.Signal(int)
	startValueChanged = QtCore.Signal(int)
	endValueChanged = QtCore.Signal(int)

	_SPLIT_START = 1
	_SPLIT_END = 2

	def __init__(self, parent=None):
		# super(QRangeSlider, self).__init__(parent)
		super().__init__()
		self.setupUi(self)
		self.setMouseTracking(False)
		self._splitter.splitterMoved.connect(self._handleMoveSplitter)
		self._head_layout = QtWidgets.QHBoxLayout()
		self._head_layout.setSpacing(0)
		self._head_layout.setContentsMargins(0, 0, 0, 0)
		self._head.setLayout(self._head_layout)
		self.head = Head(self._head, main=self)
		self._head_layout.addWidget(self.head)
		self._handle_layout = QtWidgets.QHBoxLayout()
		self._handle_layout.setSpacing(0)
		self._handle_layout.setContentsMargins(0, 0, 0, 0)
		self._handle.setLayout(self._handle_layout)
		self.handle = Handle(self._handle, main=self)
		self.handle.setTextColor((150, 255, 150))
		self._handle_layout.addWidget(self.handle)
		self._tail_layout = QtWidgets.QHBoxLayout()
		self._tail_layout.setSpacing(0)
		self._tail_layout.setContentsMargins(0, 0, 0, 0)
		self._tail.setLayout(self._tail_layout)
		self.tail = Tail(self._tail, main=self)
		self._tail_layout.addWidget(self.tail)
		self.setMin(0)
		self.setMax(100)
		self.setStart(0)
		self.setEnd(100)
		self.setDrawValues(True)

	def min(self):
		return getattr(self, '__min', None)

	def max(self):
		return getattr(self, '__max', None)

	def setMin(self, value):
		setattr(self, '__min', value)
		self.minValueChanged.emit(value)

	def setMax(self, value):
		setattr(self, '__max', value)
		self.maxValueChanged.emit(value)

	def start(self) -> int:
		return getattr(self, '__start', None)

	def end(self) -> int:
		return getattr(self, '__end', None)

	def _setStart(self, value):
		setattr(self, '__start', value)
		self.startValueChanged.emit(value)

	def setStart(self, value):
		v = self._valueToPos(value)
		self._splitter.splitterMoved.disconnect()
		self._splitter.moveSplitter(v, self._SPLIT_START)
		self._splitter.splitterMoved.connect(self._handleMoveSplitter)
		self._setStart(value)

	def _setEnd(self, value):
		setattr(self, '__end', value)
		self.endValueChanged.emit(value)

	def setEnd(self, value):
		v = self._valueToPos(value)
		self._splitter.splitterMoved.disconnect()
		self._splitter.moveSplitter(v, self._SPLIT_END)
		self._splitter.splitterMoved.connect(self._handleMoveSplitter)
		self._setEnd(value)

	def drawValues(self):
		return getattr(self, '__drawValues', None)

	def setDrawValues(self, draw):
		setattr(self, '__drawValues', draw)

	def getRange(self) -> typing.Tuple[int, int]:
		return (self.start(), self.end())

	def setRange(self, start, end):
		self.setStart(start)
		self.setEnd(end)

	def keyPressEvent(self, event):
		key = event.key()
		if key == QtCore.Qt.Key_Left:
			s = self.start()-1
			e = self.end()-1
		elif key == QtCore.Qt.Key_Right:
			s = self.start()+1
			e = self.end()+1
		else:
			event.ignore()
			return
		event.accept()
		if s >= self.min() and e <= self.max():
			self.setRange(s, e)

	def setBackgroundStyle(self, style):
		self._tail.setStyleSheet(style)
		self._head.setStyleSheet(style)

	def setSpanStyle(self, style):
		self._handle.setStyleSheet(style)

	def _valueToPos(self, value):
		return scale(value, (self.min(), self.max()), (0, self.width()))

	def _posToValue(self, xpos):
		return scale(xpos, (0, self.width()), (self.min(), self.max()+1)) #TODO: +1 has been added to reach end of bar

	def _handleMoveSplitter(self, xpos, index):
		hw = self._splitter.handleWidth()
		def _lockWidth(widget):
			width = widget.size().width()
			widget.setMinimumWidth(width)
			widget.setMaximumWidth(width)
		def _unlockWidth(widget):
			widget.setMinimumWidth(0)
			widget.setMaximumWidth(16777215)
		v = self._posToValue(xpos)
		if index == self._SPLIT_START:
			_lockWidth(self._tail)
			if v >= self.end():
				return
			offset = -20
			w = xpos + offset
			self._setStart(v)
		elif index == self._SPLIT_END:
			_lockWidth(self._head)
			if v <= self.start():
				return
			offset = -40
			w = self.width() - xpos + offset
			self._setEnd(v)
		_unlockWidth(self._tail)
		_unlockWidth(self._head)
		_unlockWidth(self._handle)

if __name__ == '__main__':

	app = QtWidgets.QApplication(sys.argv)
	rs = QRangeSlider()
	rs.show()
	# rs.setRange(15, 35)
	# rs.setBackgroundStyle('background: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #222, stop:1 #333);')
	# rs.handle.setStyleSheet('background: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #282, stop:1 #393);')
	app.exec_()