from PySide6.QtCore import QPointF, Signal
from PySide6.QtGui import QColor
from PySide6.QtWidgets import QWidget

from .canvas_interaction import CanvasInteractionMixin
from .canvas_render import CanvasRenderMixin
from .canvas_state import CanvasStateMixin


class QtSlicingCanvas(CanvasInteractionMixin, CanvasRenderMixin, CanvasStateMixin, QWidget):
    AUTO_FIT_SCALE = 0.95
    OFF_CANVAS_COLOR = QColor(38, 38, 38)
    CORNER_HANDLE_HIT_RADIUS = 12.0
    SIDE_HANDLE_HIT_RADIUS = 14.0
    SIDE_HANDLE_SIZE_ACTIVE = 11.0
    SIDE_HANDLE_SIZE_INACTIVE = 9.0
    active_slice_changed = Signal(int)

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setMouseTracking(True)
        self.setMinimumSize(640, 480)

        self.zoom = 1.0
        self.image = None
        self.pan_offset = QPointF(0.0, 0.0)
        self.slices = []
        self.active_slice_index = None

        self.corner_dragging = None
        self.side_dragging = None
        self.rotation_dragging = None
        self.box_dragging = None
        self.rotate_handles_mode = False
        self.panning = False
        self.last_mouse_pos = QPointF(0.0, 0.0)
        self.user_transformed_view = False