"""Color selection utilities."""

from __future__ import annotations

import colorsys

from tkinter import colorchooser, messagebox


class ColorPickerMixin:
    """Handles colour selection from dialogs and mouse clicks."""

    ref_hue: float | None

    def choose_color(self):
        rgb, hex_colour = colorchooser.askcolor(title="Farbe wählen")
        if rgb is None:
            return
        r, g, b = [int(channel) for channel in rgb]
        h, s, v = colorsys.rgb_to_hsv(r / 255.0, g / 255.0, b / 255.0)
        self.ref_hue = h * 360.0
        span = 30
        self.hue_min.set((self.ref_hue - span) % 360)
        self.hue_max.set((self.ref_hue + span) % 360)
        self.update_preview()
        self.status.config(text=f"Farbe gewählt: {hex_colour} (Hue {self.ref_hue:.1f}°)")

    def enable_pick_mode(self):
        if self.preview_img is None:
            messagebox.showinfo("Info", "Bitte zuerst ein Bild laden.")
            return
        self.pick_mode = True
        self.status.config(text="Pick-Modus: Klicke links ins Bild, um Farbe zu wählen (Esc beendet)")

    def disable_pick_mode(self, event=None):
        if self.pick_mode:
            self.pick_mode = False
            self.status.config(text="Pick-Modus beendet.")

    def on_canvas_click(self, event):
        if not self.pick_mode or self.preview_img is None:
            return
        x = int(event.x)
        y = int(event.y)
        if x < 0 or y < 0 or x >= self.preview_img.width or y >= self.preview_img.height:
            return
        r, g, b, a = self.preview_img.getpixel((x, y))
        if a == 0:
            return
        h, s, v = colorsys.rgb_to_hsv(r / 255.0, g / 255.0, b / 255.0)
        self.ref_hue = h * 360.0
        span = 30
        self.hue_min.set((self.ref_hue - span) % 360)
        self.hue_max.set((self.ref_hue + span) % 360)
        self.disable_pick_mode()
        self.update_preview()
        self.status.config(text=f"Farbe vom Bild gewählt: Hue {self.ref_hue:.1f}°")


__all__ = ["ColorPickerMixin"]