#!/usr/bin/env python3
"""
Draw actual quadrilaterals (not rectangles) to match rotated text bboxes.
"""

import json
from pathlib import Path
from PIL import Image
from pdf2image import convert_from_path
from reportlab.pdfgen import canvas
from reportlab.lib.utils import ImageReader
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.lib.colors import red, blue
import tempfile
import os

# Register Chinese font
try:
    pdfmetrics.registerFont(TTFont('ChineseFont', 'C:/Windows/Fonts/msyh.ttc'))
    font_name = 'ChineseFont'
except:
    font_name = 'Helvetica'

# Paths
json_path = "Raw/DevelopChinese/OCR/听力Intro.json"
pdf_path = "Raw/DevelopChinese/PDF/听力Intro.pdf"
output_path = "test_QUADRILATERAL.pdf"

# Load JSON
with open(json_path) as f:
    data = json.load(f)

# Convert PDF to image at 300 DPI (same as OCR)
print("Converting PDF to image at 300 DPI...")
images = convert_from_path(pdf_path, dpi=300)
img = images[0]
img_width, img_height = img.size
print(f"Image size: {img_width} x {img_height}")

# Create PDF
c = canvas.Canvas(output_path)
c.setPageSize((img_width, img_height))

# Draw image
with tempfile.NamedTemporaryFile(suffix='.png', delete=False) as tmp:
    img.save(tmp.name, 'PNG')
    tmp_path = tmp.name

c.drawImage(ImageReader(tmp_path), 0, 0, width=img_width, height=img_height)

# Get page data
page_data = data['pages'][0]
details = page_data.get('details', [])

text_count = 0
for detail in details:
    text = detail.get('text', '').strip()
    if not text:
        continue

    bbox = detail.get('bbox', [])
    if not bbox or len(bbox) != 4:
        continue

    # bbox is [[x0,y0], [x1,y1], [x2,y2], [x3,y3]] in image coordinates
    # Convert Y (PDF has origin at bottom, image at top)
    points_pdf = []
    for point in bbox:
        x = point[0]
        y = img_height - point[1]  # Flip Y
        points_pdf.append((x, y))

    # Draw the actual quadrilateral
    c.setStrokeColor(red)
    c.setLineWidth(0.5)

    # Draw lines connecting all 4 points
    path = c.beginPath()
    path.moveTo(points_pdf[0][0], points_pdf[0][1])
    path.lineTo(points_pdf[1][0], points_pdf[1][1])
    path.lineTo(points_pdf[2][0], points_pdf[2][1])
    path.lineTo(points_pdf[3][0], points_pdf[3][1])
    path.close()
    c.drawPath(path, stroke=1, fill=0)

    # For text, use bottom-left corner (point 3)
    x_text = points_pdf[3][0]
    y_text = points_pdf[3][1]

    # Calculate height from bbox
    min_y = min(p[1] for p in points_pdf)
    max_y = max(p[1] for p in points_pdf)
    height = max_y - min_y

    font_size = max(1, height * 0.7)
    c.setFont(font_name, font_size)
    c.setFillColor(blue)
    c.drawString(x_text, y_text, text)

    text_count += 1

print(f"Drew {text_count} quadrilaterals")

c.showPage()
c.save()
os.unlink(tmp_path)

print(f"\nDone! Check {output_path}")
print("Red quadrilaterals should now EXACTLY match the text areas!")