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from PySide6.QtCore import QBasicTimer, Property
from PySide6.QtGui import QColor, QFontMetrics, QPainter, QPalette
from PySide6.QtWidgets import QWidget


class WigglyWidget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self._step = 0
        self._text = ""
        self.setBackgroundRole(QPalette.Midlight)
        self.setAutoFillBackground(True)

        new_font = self.font()
        new_font.setPointSize(new_font.pointSize() + 20)
        self.setFont(new_font)
        self._timer = QBasicTimer()

    def isRunning(self):
        return self._timer.isActive()

    def setRunning(self, r):
        if r == self.isRunning():
            return
        if r:
            self._timer.start(60, self)
        else:
            self._timer.stop()

    def paintEvent(self, event):
        if not self._text:
            return

        sineTable = [0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100,
                     -92, -71, -38]

        metrics = QFontMetrics(self.font())
        x = (self.width() - metrics.horizontalAdvance(self.text)) / 2
        y = (self.height() + metrics.ascent() - metrics.descent()) / 2
        color = QColor()

        painter = QPainter(self)
        for i in range(len(self.text)):
            index = (self._step + i) % 16
            color.setHsv((15 - index) * 16, 255, 191)
            painter.setPen(color)
            dy = (sineTable[index] * metrics.height()) / 400
            c = self._text[i]
            painter.drawText(x, y - dy, str(c))
            x += metrics.horizontalAdvance(c)

        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
        painter.end()

    def timerEvent(self, event):
        if event.timerId() == self._timer.timerId():
            self._step += 1
            self.update()
        else:
            QWidget.timerEvent(event)

    def text(self):
        return self._text

    def setText(self, text):
        self._text = text

    running = Property(bool, isRunning, setRunning)
    text = Property(str, text, setText)
