#!/usr/bin/env python3
"""
Test swipe detection in Pygame HAL.
This will show you how to perform swipes and what gestures are detected.
"""

import asyncio
import sys
from pathlib import Path

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

from dreader.hal_pygame import PygameDisplayHAL
from dreader.gesture import GestureType
from PIL import Image, ImageDraw, ImageFont

async def test_swipes():
    """Test swipe detection with visual feedback."""

    print("=" * 70)
    print("Swipe Detection Test")
    print("=" * 70)
    print("\nInstructions:")
    print("  - Click and drag to create swipes")
    print("  - Drag at least 30 pixels for swipe detection")
    print("  - Short movements are detected as taps")
    print("  - Press Q or ESC to quit")
    print("\nSwipe directions:")
    print("  - Drag LEFT → Next page (SWIPE_LEFT)")
    print("  - Drag RIGHT → Previous page (SWIPE_RIGHT)")
    print("  - Drag UP → Scroll up (SWIPE_UP)")
    print("  - Drag DOWN → Scroll down (SWIPE_DOWN)")
    print("\nOR use keyboard shortcuts:")
    print("  - Left/Right Arrow or Space/PageUp/PageDown")
    print("\n" + "=" * 70)

    # Create HAL
    hal = PygameDisplayHAL(width=800, height=600, title="Swipe Detection Test")

    await hal.initialize()

    # Create instruction image
    img = Image.new('RGB', (800, 600), color=(240, 240, 240))
    draw = ImageDraw.Draw(img)

    try:
        font_large = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 32)
        font_small = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 20)
    except:
        font_large = ImageFont.load_default()
        font_small = ImageFont.load_default()

    # Draw instructions
    y = 50
    draw.text((400, y), "Swipe Detection Test", fill=(0, 0, 0), font=font_large, anchor="mt")

    y += 80
    instructions = [
        "Click and DRAG to create swipes:",
        "",
        "← Drag LEFT = Next Page",
        "→ Drag RIGHT = Previous Page",
        "↑ Drag UP = Scroll Up",
        "↓ Drag DOWN = Scroll Down",
        "",
        "Minimum drag distance: 30 pixels",
        "",
        "Or use keyboard:",
        "Space/Right Arrow = Next",
        "Left Arrow = Previous",
        "",
        "Press Q or ESC to quit"
    ]

    for line in instructions:
        draw.text((400, y), line, fill=(0, 0, 0), font=font_small, anchor="mt")
        y += 30

    await hal.show_image(img)

    # Event loop
    hal.running = True
    gesture_count = 0
    last_gesture = None

    print("\nWaiting for gestures... (window is now open)")

    while hal.running:
        event = await hal.get_touch_event()

        if event:
            gesture_count += 1
            last_gesture = event.gesture

            print(f"\n[{gesture_count}] Detected: {event.gesture.value}")
            print(f"    Position: ({event.x}, {event.y})")

            # Visual feedback
            feedback_img = img.copy()
            feedback_draw = ImageDraw.Draw(feedback_img)

            # Draw gesture type
            gesture_text = f"Gesture #{gesture_count}: {event.gesture.value.upper()}"
            feedback_draw.rectangle([(0, 550), (800, 600)], fill=(50, 150, 50))
            feedback_draw.text((400, 575), gesture_text, fill=(255, 255, 255), font=font_large, anchor="mm")

            await hal.show_image(feedback_img)

            # Brief pause to show feedback
            await asyncio.sleep(0.5)
            await hal.show_image(img)

        await asyncio.sleep(0.01)

    await hal.cleanup()

    print("\n" + "=" * 70)
    print(f"Test complete! Detected {gesture_count} gestures.")
    if last_gesture:
        print(f"Last gesture: {last_gesture.value}")
    print("=" * 70)

if __name__ == "__main__":
    asyncio.run(test_swipes())