#!/usr/bin/env python3
"""
Interactive viewer for min_max_segments images
Shows 100 images per page in a 10x10 grid
Use arrow keys or buttons to navigate between pages
"""

import os
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
from pathlib import Path
import numpy as np
from matplotlib.widgets import Button

class ImageGridViewer:
    def __init__(self, image_dir, images_per_page=100, grid_size=(10, 10)):
        self.image_dir = Path(image_dir)
        self.images_per_page = images_per_page
        self.grid_size = grid_size
        self.current_page = 0
        
        # Get all PNG files and sort them
        self.image_files = sorted(list(self.image_dir.glob('*.png')))
        
        if not self.image_files:
            print(f"No PNG files found in {image_dir}")
            return
        
        self.total_images = len(self.image_files)
        self.num_pages = (self.total_images + images_per_page - 1) // images_per_page
        
        print(f"Found {self.total_images} images in {self.num_pages} pages")
        
        # Create the figure and axes
        self.fig, self.axes = plt.subplots(grid_size[0], grid_size[1], figsize=(16, 16))
        
        # Add navigation buttons
        self.add_navigation_buttons()
        
        # Display first page
        self.display_page(0)
        
        # Connect keyboard events
        self.fig.canvas.mpl_connect('key_press_event', self.on_key_press)
        
        # Maximize window
        self.maximize_window()
        
        plt.show()
    
    def maximize_window(self):
        """Try to maximize the window"""
        try:
            manager = plt.get_current_fig_manager()
            if hasattr(manager, 'window'):
                if hasattr(manager.window, 'showMaximized'):
                    manager.window.showMaximized()
            elif hasattr(manager, 'full_screen_toggle'):
                manager.full_screen_toggle()
        except:
            pass
    
    def add_navigation_buttons(self):
        """Add Previous and Next buttons"""
        # Previous button
        ax_prev = plt.axes([0.3, 0.01, 0.1, 0.03])
        self.btn_prev = Button(ax_prev, 'Previous')
        self.btn_prev.on_clicked(self.prev_page)
        
        # Next button
        ax_next = plt.axes([0.6, 0.01, 0.1, 0.03])
        self.btn_next = Button(ax_next, 'Next')
        self.btn_next.on_clicked(self.next_page)
        
        # Page indicator text
        ax_page = plt.axes([0.42, 0.01, 0.16, 0.03])
        ax_page.axis('off')
        self.page_text = ax_page.text(0.5, 0.5, '', ha='center', va='center', fontsize=12)
    
    def display_page(self, page_num):
        """Display a specific page of images"""
        if page_num < 0 or page_num >= self.num_pages:
            return
        
        self.current_page = page_num
        
        # Calculate start and end indices for this page
        start_idx = page_num * self.images_per_page
        end_idx = min(start_idx + self.images_per_page, self.total_images)
        page_images = self.image_files[start_idx:end_idx]
        
        # Clear all axes
        axes_flat = self.axes.flatten()
        for ax in axes_flat:
            ax.clear()
            ax.axis('off')
        
        # Display each image
        for idx, (ax, img_path) in enumerate(zip(axes_flat, page_images)):
            try:
                img = mpimg.imread(img_path)
                ax.imshow(img)
                # Extract filename without path for title
                filename = img_path.name
                ax.set_title(filename, fontsize=8, pad=2)
                ax.axis('off')
            except Exception as e:
                print(f"Error loading {img_path}: {e}")
                ax.axis('off')
        
        # Update title
        self.fig.suptitle(f'Page {page_num + 1}/{self.num_pages} (Images {start_idx + 1}-{end_idx}/{self.total_images})', 
                          fontsize=14, fontweight='bold')
        
        # Update page indicator
        self.page_text.set_text(f'Page {page_num + 1} of {self.num_pages}')
        
        # Update button states
        self.btn_prev.set_active(page_num > 0)
        self.btn_next.set_active(page_num < self.num_pages - 1)
        
        # Redraw
        self.fig.canvas.draw_idle()
    
    def next_page(self, event=None):
        """Go to next page"""
        if self.current_page < self.num_pages - 1:
            self.display_page(self.current_page + 1)
    
    def prev_page(self, event=None):
        """Go to previous page"""
        if self.current_page > 0:
            self.display_page(self.current_page - 1)
    
    def on_key_press(self, event):
        """Handle keyboard navigation"""
        if event.key == 'right':
            self.next_page()
        elif event.key == 'left':
            self.prev_page()
        elif event.key == 'home':
            self.display_page(0)
        elif event.key == 'end':
            self.display_page(self.num_pages - 1)
        elif event.key == 'q' or event.key == 'escape':
            plt.close('all')

if __name__ == "__main__":
    print("=" * 60)
    print("Image Grid Viewer")
    print("=" * 60)
    print("Navigation:")
    print("  - Use 'Previous' and 'Next' buttons")
    print("  - Or use arrow keys: ← (previous) → (next)")
    print("  - Home key: first page")
    print("  - End key: last page")
    print("  - Press 'q' or ESC to quit")
    print("=" * 60)
    
    # Directory containing the images
    image_directory = "min_max_segments"
    
    # Create and show the viewer
    viewer = ImageGridViewer(image_directory, images_per_page=100, grid_size=(10, 10))