#!/usr/bin/env python3
"""
Debug script to visualize interactive elements in overlays.
Shows where clickable links are located.
"""

import sys
from pathlib import Path
sys.path.insert(0, str(Path(__file__).parent))

from dreader.application import EbookReader
from dreader.overlays.settings import SettingsOverlay
from dreader.overlays.navigation import NavigationOverlay
from PIL import Image, ImageDraw, ImageFont

def find_all_links(overlay_reader, panel_width, panel_height):
    """Scan overlay to find all interactive link positions."""
    link_positions = {}

    if not overlay_reader or not overlay_reader.manager:
        print("No overlay reader available")
        return link_positions

    page = overlay_reader.manager.get_current_page()
    if not page:
        print("No page available")
        return link_positions

    print(f"Scanning {panel_width}x{panel_height} overlay for interactive elements...")

    # Scan with moderate granularity (every 5 pixels)
    for y in range(0, panel_height, 5):
        for x in range(0, panel_width, 5):
            result = page.query_point((x, y))
            if result and result.link_target:
                if result.link_target not in link_positions:
                    link_positions[result.link_target] = {
                        'first_pos': (x, y),
                        'bounds': result.bounds,
                        'text': result.text
                    }

    return link_positions


def visualize_settings_overlay():
    """Visualize interactive elements in settings overlay."""
    print("\n" + "="*70)
    print("SETTINGS OVERLAY - Interactive Element Map")
    print("="*70)

    # Create reader
    reader = EbookReader(page_size=(800, 1200))

    # Load a test book
    test_book = Path(__file__).parent / "tests" / "data" / "library-epub" / "pg11-images-3.epub"
    if not test_book.exists():
        print(f"Test book not found: {test_book}")
        return

    reader.load_epub(str(test_book))

    # Create settings overlay
    settings_overlay = SettingsOverlay(reader)
    base_page = reader.get_current_page()

    # Open overlay
    overlay_image = settings_overlay.open(
        base_page,
        font_scale=1.0,
        line_spacing=5,
        inter_block_spacing=15,
        word_spacing=0
    )

    # Find all interactive elements
    panel_width = 480  # 60% of 800
    panel_height = 840  # 70% of 1200

    link_positions = find_all_links(
        settings_overlay._overlay_reader,
        panel_width,
        panel_height
    )

    print(f"\nFound {len(link_positions)} interactive elements:")
    for link_target, info in sorted(link_positions.items()):
        x, y = info['first_pos']
        bounds = info['bounds']
        text = info['text']
        print(f"  {link_target:30s} at ({x:3d}, {y:3d}) - \"{text}\"")
        print(f"    Bounds: {bounds}")

    # Create visualization
    print("\nCreating visualization...")

    # Get just the overlay panel (not the composited image)
    overlay_panel = settings_overlay._cached_overlay_image.copy()
    draw = ImageDraw.Draw(overlay_panel)

    # Draw markers on each interactive element
    for link_target, info in link_positions.items():
        x, y = info['first_pos']

        # Draw red circle at first detected position
        radius = 8
        draw.ellipse(
            [x - radius, y - radius, x + radius, y + radius],
            outline=(255, 0, 0),
            width=2
        )

        # Draw crosshair
        draw.line([(x - 15, y), (x + 15, y)], fill=(255, 0, 0), width=1)
        draw.line([(x, y - 15), (x, y + 15)], fill=(255, 0, 0), width=1)

    # Save visualization
    output_path = Path(__file__).parent / "overlay_links_debug.png"
    overlay_panel.save(output_path)
    print(f"\nVisualization saved to: {output_path}")
    print("Red circles show clickable link positions")

    reader.close()


def visualize_navigation_overlay():
    """Visualize interactive elements in navigation overlay."""
    print("\n" + "="*70)
    print("NAVIGATION OVERLAY - Interactive Element Map")
    print("="*70)

    # Create reader
    reader = EbookReader(page_size=(800, 1200))

    # Load a test book
    test_book = Path(__file__).parent / "tests" / "data" / "library-epub" / "pg11-images-3.epub"
    if not test_book.exists():
        print(f"Test book not found: {test_book}")
        return

    reader.load_epub(str(test_book))

    # Create navigation overlay
    nav_overlay = NavigationOverlay(reader)
    base_page = reader.get_current_page()

    # Get chapters
    chapters = reader.get_chapters()

    # Open overlay
    overlay_image = nav_overlay.open(
        base_page,
        chapters=chapters,
        bookmarks=[],
        active_tab="contents"
    )

    # Find all interactive elements
    panel_width = 480  # 60% of 800
    panel_height = 840  # 70% of 1200

    link_positions = find_all_links(
        nav_overlay._overlay_reader,
        panel_width,
        panel_height
    )

    print(f"\nFound {len(link_positions)} interactive elements:")
    for link_target, info in sorted(link_positions.items()):
        x, y = info['first_pos']
        text = info['text']
        print(f"  {link_target:30s} at ({x:3d}, {y:3d}) - \"{text}\"")

    # Create visualization
    print("\nCreating visualization...")

    # Get just the overlay panel
    overlay_panel = nav_overlay._cached_overlay_image.copy()
    draw = ImageDraw.Draw(overlay_panel)

    # Draw markers on each interactive element
    for link_target, info in link_positions.items():
        x, y = info['first_pos']

        # Draw green circle
        radius = 8
        draw.ellipse(
            [x - radius, y - radius, x + radius, y + radius],
            outline=(0, 255, 0),
            width=2
        )

    # Save visualization
    output_path = Path(__file__).parent / "nav_overlay_links_debug.png"
    overlay_panel.save(output_path)
    print(f"\nVisualization saved to: {output_path}")
    print("Green circles show clickable link positions")

    reader.close()


if __name__ == "__main__":
    visualize_settings_overlay()
    visualize_navigation_overlay()
    print("\n" + "="*70)
    print("Debug complete! Check the generated PNG files.")
    print("="*70)