import json

from products.db import Product, find_product_by_tag, find_product_by_key, insert_product, get_tags, add_tag, find_product_by_id

from products import woolworths, coles
SCRAPERS = { 'woolworths': woolworths, 'coles': coles }

from typing import List, Union
import re

def _get_shop_key(link: str) -> Union[str, str]: # (shop_code, product_id)
    for shop_code, shop_scraper in SCRAPERS.items():
        product_id = shop_scraper.get_product_id(link)
        if product_id:
            return shop_code, product_id
    return None, None

async def add_missing_tags(conn, product: Product, tags: List[str]):
    existing_tags = set()
    async for tag in get_tags(conn, product):
        existing_tags.add(tag)
    
    remaining_tags = set(tags) - existing_tags
    if not remaining_tags:
        return False
    
    for tag in remaining_tags:
        await add_tag(conn, product, tag)
    
    return product

async def get_or_create(conn, url: str, tags: List[str]) -> Product:
    shop_code, product_id = _get_shop_key(url)
    if not product_id:
        return None
    
    existing = await find_product_by_key(conn, shop_code, product_id)
    if existing:
        await add_missing_tags(conn, existing, tags)
        return existing
    
    product_data, raw_response = await SCRAPERS[shop_code].scrape(product_id)
    product = Product(
        id=-1,
        shop_code=shop_code,
        product_id=product_id,
        link=url,
        **product_data
    )

    await insert_product(conn, product, raw_response)
    await add_missing_tags(conn, product, tags)

    return product

def _dump_json_data_to_log(data: dict, product_id: str) -> str:
    import os, re
    dir = './data/dump'
    if not os.path.exists(dir):
        os.makedirs(dir)

    prefix = f'product_{product_id}'
    suffix = '.json'
    file_ids = [int(re.findall(r'\d+', f)[0]) for f in os.listdir(dir) if re.match(prefix + r'\d+' + suffix, f)]
    id = max(file_ids) + 1 if file_ids else 0
    filename = f'{prefix}{id}{suffix}'
    with open(os.path.join(dir, filename), 'w') as f:
        json.dump(data, f, indent=4)