import sys
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtCore import Qt, QRect, QPoint
from PyQt5.QtGui import QPainter, QPen, QColor, QFont, QFontMetrics

class OverlayCanvas(QWidget):
    """
    UI overlay for drawing and interacting with on-screen elements.
    """
    def __init__(self, parent=None):
        super().__init__(parent)

        # **Full-screen overlay**
        screen_geo = QApplication.primaryScreen().geometry()
        self.setGeometry(screen_geo)  # Set to full screen

        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)
        self.setAttribute(Qt.WA_TranslucentBackground, True)
        self.setAttribute(Qt.WA_NoSystemBackground, True)
        self.setAttribute(Qt.WA_OpaquePaintEvent, False)
        self.setAttribute(Qt.WA_AlwaysStackOnTop, True)

        # **Helper Object: Low Health Alert**
        self.helper_LowHealthAlert = QRect(250, 300, 900, 35)  # Adjusted width and height
        self.dragging = False
        self.resizing = False
        self.drag_offset = QPoint()

    def paintEvent(self, event):
        """Draw the helper overlay objects."""
        painter = QPainter(self)
        painter.setPen(Qt.NoPen)
        painter.setBrush(QColor(255, 0, 0))  # Solid red rectangle
        painter.drawRect(self.helper_LowHealthAlert)

        # Draw bold white text centered within the rectangle
        font = QFont("Arial", 14, QFont.Bold)  # Scaled text
        painter.setFont(font)
        painter.setPen(QColor(255, 255, 255))
        
        text = "LOW HEALTH"
        metrics = QFontMetrics(font)
        text_width = metrics.horizontalAdvance(text)
        text_height = metrics.height()
        text_x = self.helper_LowHealthAlert.center().x() - text_width // 2
        text_y = self.helper_LowHealthAlert.center().y() + text_height // 4
        
        painter.drawText(text_x, text_y, text)

    def mousePressEvent(self, event):
        """Detect clicks for dragging and resizing the helper object."""
        if event.button() == Qt.LeftButton:
            if self.helper_LowHealthAlert.contains(event.pos()):
                if event.pos().x() > self.helper_LowHealthAlert.right() - 10 and event.pos().y() > self.helper_LowHealthAlert.bottom() - 10:
                    self.resizing = True
                else:
                    self.dragging = True
                    self.drag_offset = event.pos() - self.helper_LowHealthAlert.topLeft()

    def mouseMoveEvent(self, event):
        """Handle dragging and resizing movements."""
        if self.dragging:
            self.helper_LowHealthAlert.moveTopLeft(event.pos() - self.drag_offset)
            self.update()
        elif self.resizing:
            new_width = max(150, event.pos().x() - self.helper_LowHealthAlert.x())
            new_height = max(20, event.pos().y() - self.helper_LowHealthAlert.y())
            self.helper_LowHealthAlert.setSize(new_width, new_height)
            self.update()

    def mouseReleaseEvent(self, event):
        """End dragging or resizing event."""
        self.dragging = False
        self.resizing = False

if __name__ == '__main__':
    app_gui = QApplication(sys.argv)
    overlay_window = OverlayCanvas()
    overlay_window.show()
    sys.exit(app_gui.exec_())