import logging

from PySide6.QtWidgets import (
    QGraphicsRectItem, QGraphicsSimpleTextItem, QGraphicsItem
)
from PySide6.QtGui import QBrush, QColor, QFont, QFontMetricsF, QPen, Qt
from PySide6.QtCore import Signal, QObject, QTimer


NORMAL_COLOR = QColor("lightgray")
CLICKED_COLOR = QColor("darkgray")
TEXT_SCALE_FACTOR = 0.4
CLICK_HIGHLIGHT_DURATION_MS = 100
Z_INDEX_MULTIPLIER = 2.0

class KeyItem(QGraphicsRectItem, QObject):
    clicked = Signal(str)

    def __init__(self, label: str):
        QObject.__init__(self)
        QGraphicsRectItem.__init__(self)

        self.logger = logging.getLogger(__name__)
        

        self.label = label
        self.width = 0.0
        self.height = 0.0
        self.scale_factor = 1.0

        self._reset_timer = QTimer()
        self._reset_timer.setSingleShot(True)
        self._reset_timer.timeout.connect(self.__reset_color)

        self.text = QGraphicsSimpleTextItem(label, self)
        self.text.setFlag(QGraphicsItem.ItemIgnoresTransformations, True)

        self.__normal_brush = QBrush(NORMAL_COLOR)
        self.__click_brush = QBrush(CLICKED_COLOR)
        self.setBrush(self.__normal_brush)

    def set_geometry(self, x: float, y: float, width: float, height: float):
        self.width = width
        self.height = height

        self.setRect(0, 0, width, height)
        self.setPos(x, y)
        self.setTransformOriginPoint(width / 2, height / 2)

        self.update_label_font()

    def update_label_font(self):
        min_dimension = min(self.width, self.height)
        font_size = min_dimension * TEXT_SCALE_FACTOR

        font = QFont()
        font.setPointSizeF(font_size)
        self.text.setFont(font)

        metrics = QFontMetricsF(font)
        text_rect = metrics.boundingRect(self.label)

        text_x = (self.width - text_rect.width()) / 2
        text_y = (self.height - text_rect.height()) / 2
        self.text.setPos(text_x, text_y)

    def set_scale_factor(self, scale: float):
        scaled_z = scale * Z_INDEX_MULTIPLIER
        self.scale_factor = scaled_z
        self.setZValue(scaled_z)
        self.setScale(scale)

    def mousePressEvent(self, q_mouse_event):
        self.logger.info("%s was clicked", self.label)
        self.clicked.emit(self.label)
        self.__onclick_color()

    def __onclick_color(self):
        self.setBrush(self.__click_brush)
        self._reset_timer.start(CLICK_HIGHLIGHT_DURATION_MS)

    def __reset_color(self):
        self.setBrush(self.__normal_brush)