#! /usr/bin/python3
# Last edited on 2026-01-23 16:15:12 by stolfi
# Initial version generated by Google AI

import sys
import tkinter as tk
from PIL import Image, ImageTk

# ??? Check and adapt

class ImagePicker:
  def __init__(self, root, image_path):
    self.root = root
    self.root.title(f"Image Pixel Picker - {image_path}")
    
    # Load the original image
    self.orig_image = Image.open(image_path)
    self.width, self.height = self.orig_image.size
    
    # UI State
    self.zoom_level = 1.0
    self.offset_x = 0
    self.offset_y = 0
    
    # Create Canvas
    self.canvas = tk.Canvas(root, cursor="cross", bg="grey")
    self.canvas.pack(fill="both", expand=True)
    
    # Bind events
    self.canvas.bind("<Button-1>", self.on_click)
    self.canvas.bind("<B1-Motion>", self.on_drag)
    self.canvas.bind("<ButtonRelease-1>", self.on_release)
    self.canvas.bind("<MouseWheel>", self.on_zoom)  # Windows/macOS
    self.canvas.bind("<Button-4>", self.on_zoom)  # Linux scroll up
    self.canvas.bind("<Button-5>", self.on_zoom)  # Linux scroll down
    self.canvas.bind("<Return>", self.on_enter)  # ENTER key
    
    self.drag_data = {"x": 0, "y": 0, "moved": False}
    self.render_image()
    self.canvas.focus_set()

  def render_image(self):
    # Calculate new size
    new_w = int(self.width * self.zoom_level)
    new_h = int(self.height * self.zoom_level)
    
    # Avoid zero size
    if new_w < 1 or new_h < 1: return

    # Resize and display
    resized = self.orig_image.resize((new_w, new_h), Image.Resampling.LANCZOS)
    self.tk_image = ImageTk.PhotoImage(resized)
    
    self.canvas.delete("all")
    self.canvas.create_image(self.offset_x, self.offset_y, anchor="nw", image=self.tk_image)

  def on_click(self, event):
    self.drag_data["x"] = event.x
    self.drag_data["y"] = event.y
    self.drag_data["moved"] = False

  def on_enter(self, event):
    sys.stdout.write("\n")
    sys.stdout.flush()

  def on_drag(self, event):
    dx = event.x - self.drag_data["x"]
    dy = event.y - self.drag_data["y"]
    if abs(dx) > 2 or abs(dy) > 2:
      self.drag_data["moved"] = True
      self.offset_x += dx
      self.offset_y += dy
      self.drag_data["x"] = event.x
      self.drag_data["y"] = event.y
      self.render_image()

  def on_release(self, event):
    # If it was a click (not a drag), report coordinates
    if not self.drag_data["moved"]:
      # Convert screen coords to image coords
      img_x = (event.x - self.offset_x) / self.zoom_level
      img_y = (event.y - self.offset_y) / self.zoom_level
      
      if 0 <= img_x < self.width and 0 <= img_y < self.height:
        print(f"{int(img_x)} {int(img_y)}")
        sys.stdout.flush()

  def on_zoom(self, event):
    # Handle different OS scroll events
    if event.num == 4 or event.delta > 0:
      factor = 1.1
    else:
      factor = 0.9
      
    self.zoom_level *= factor
    self.render_image()

def main():
  if len(sys.argv) < 2:
    print("Usage: image_picker.py <path_to_image>")
    sys.exit(1)
    
  root = tk.Tk()
  root.geometry("800x600")
  app = ImagePicker(root, sys.argv[1])
  root.mainloop()
  return
  # ----------------------------------------------------------------------

main()