import os
import uuid
import json
from PIL import Image, ExifTags

def save_image(file_storage, base_dir):
    ext = os.path.splitext(file_storage.filename)[1].lower()
    name = f"{uuid.uuid4().hex}{ext}"
    original_path = os.path.join(base_dir, name)
    file_storage.save(original_path)
    web_path = os.path.join(base_dir, f"web_{name}")
    thumb_path = os.path.join(base_dir, f"thumb_{name}")
    with Image.open(original_path) as im:
        im_web = im.copy()
        im_web.thumbnail((1600, 1600))
        im_web.save(web_path)
        im_thumb = im.copy()
        im_thumb.thumbnail((400, 400))
        im_thumb.save(thumb_path)
        exif = {}
        try:
            raw = im.getexif()
            for k, v in raw.items():
                tag = ExifTags.TAGS.get(k, str(k))
                exif[tag] = str(v)
        except Exception:
            exif = {}
    return original_path, web_path, thumb_path, json.dumps(exif)