import json
import sys

from PIL import Image, ImageDraw


# Creates "validation" images with rectangles for the bounding box information that
# Claude creates when determining where to add text annotations in PDFs. See forms.md.


def create_validation_image(page_number, fields_json_path, input_path, output_path):
    # Input file should be in the `fields.json` format described in forms.md.
    with open(fields_json_path, "r", encoding="utf-8") as file_obj:
        data = json.load(file_obj)

    with Image.open(input_path) as image:
        draw = ImageDraw.Draw(image)
        num_boxes = 0

        for field in data["form_fields"]:
            if field["page_number"] != page_number:
                continue
            entry_box = field["entry_bounding_box"]
            label_box = field["label_bounding_box"]
            # Draw red rectangle over entry bounding box and blue rectangle over the label.
            draw.rectangle(entry_box, outline="red", width=2)
            draw.rectangle(label_box, outline="blue", width=2)
            num_boxes += 2

        image.save(output_path)

    print(f"Created validation image at {output_path} with {num_boxes} bounding boxes")


if __name__ == "__main__":
    if len(sys.argv) != 5:
        print("Usage: create_validation_image.py [page number] [fields.json file] [input image path] [output image path]")
        sys.exit(1)
    page_number = int(sys.argv[1])
    fields_json_path = sys.argv[2]
    input_image_path = sys.argv[3]
    output_image_path = sys.argv[4]
    create_validation_image(page_number, fields_json_path, input_image_path, output_image_path)
