from collections import defaultdict

from sqlalchemy import select
from sqlalchemy.orm import selectinload

from external.marketplace import OzonMarketplaceApi
from external.marketplace.base.product_synchronizer import BaseProductSynchronizer
from marketplaces.base.core import BaseMarketplaceController
from models import OzonProduct, ProductImage, ProductBarcode, Product
from utils.list_utils import chunk_list


class OzonProductSynchronizer(BaseProductSynchronizer):
    api: OzonMarketplaceApi
    marketplace_products: list[OzonProduct]

    def _create_product(self, product_info):
        return Product(
            client_id=self.marketplace.client_id,
            name=product_info['name'],
            article=product_info['offer_id'],
        )

    def _create_barcodes(self, product, param):
        barcodes = []
        for sku in param:
            barcode = ProductBarcode(
                product=product,
                barcode=sku
            )
            barcodes.append(barcode)
        return barcodes

    def _create_images(self, product, product_info):
        primary_image = product_info.get('primary_image')
        if primary_image:
            image = ProductImage(
                product=product,
                image_url=primary_image
            )
            return [image]
        product_images = []
        images = product_info.get('images') or []
        for image in images[:1]:
            product_image = ProductImage(
                product=product,
                image_url=image
            )
            product_images.append(product_image)
        return product_images

    def _create_ozon_product(self, product, product_info):
        return OzonProduct(
            marketplace_id=self.marketplace.id,
            product=product,
            ozon_product_id=product_info['id'],
        )

    def _process_product(self, product_info):
        product = self._create_product(product_info)
        barcodes = self._create_barcodes(product, product_info['barcodes'])
        images = self._create_images(product, product_info)
        ozon_product = self._create_ozon_product(product, product_info)

        self.products.append(product)
        self.barcodes.extend(barcodes)
        self.images.extend(images)
        self.marketplace_products.append(ozon_product)

    async def create_products(self):
        self._clear()
        product_ids = []

        async for product in self.api.get_all_products():
            product_ids.append(product['product_id'])
            if len(product_ids) > 100:
                break
        max_products = 1000
        for chunk in chunk_list(product_ids, max_products):
            data = {
                'product_id': chunk
            }
            products_info = await self.api.get_products_info(data)
            if not products_info:
                continue
            result = products_info.get('result')
            if not result:
                continue
            items = result.get('items')
            for product_info in items:
                product = self._create_product(product_info)
                self.products.append(product)
                barcodes = self._create_barcodes(product, product_info['barcodes'])
                self.barcodes.extend(barcodes)
                images = self._create_images(product, product_info)
                self.images.extend(images)
                ozon_product = self._create_ozon_product(product, product_info)
                self.marketplace_products.append(ozon_product)

        await self._write()

    async def synchronize_products(self):
        self._clear()
        synchronized_products_stmt = (
            select(
                Product
            )
            .join(
                OzonProduct
            ).options(
                selectinload(Product.barcodes),
                selectinload(Product.ozon_products)
            )
            .where(
                OzonProduct.marketplace_id == self.marketplace.id
            )
        )
        synchronized_products = await self.session.execute(synchronized_products_stmt)
        synchronized_products = synchronized_products.scalars().all()
        synchronized_products_ozon_id_dict = defaultdict(list)
        for product in synchronized_products:
            for ozon_product in product.ozon_products:
                synchronized_products_ozon_id_dict[ozon_product.ozon_product_id].append(product)
        synchronized_ozon_ids = list(synchronized_products_ozon_id_dict.keys())
        max_products = 1000
        for chunk in chunk_list(synchronized_ozon_ids, max_products):
            data = {
                'product_id': chunk
            }
            products_info = await self.api.get_products_info(data)
            if not products_info:
                continue
            result = products_info.get('result')
            if not result:
                continue
            items = result.get('items')
            for product_info in items:
                ozon_id = product_info['id']
                if ozon_id not in synchronized_ozon_ids:
                    continue
                products = synchronized_products_ozon_id_dict.get(ozon_id)
                if not products:
                    continue
                product = products[0]
                await self._update_product_info(product, product_info)
        await self._write()

    async def _update_product_info(self, product, product_info):
        product.name = product_info['name']
        product.article = product_info['offer_id']
        barcodes = self._update_barcodes(product, product_info['barcodes'])
        self.barcodes.extend(barcodes)
        images = self._update_images(product, product_info)
        self.images.extend(images)

    def _update_barcodes(self, product, param):
        existing_barcodes = {barcode.barcode for barcode in product.barcodes}
        barcodes = []
        for sku in param:
            if sku not in existing_barcodes:
                barcode = ProductBarcode(
                    product=product,
                    barcode=sku
                )
                barcodes.append(barcode)
        return barcodes

    def _update_images(self, product, product_info):
        existing_images = {image.image_url for image in product.images}
        primary_image = product_info.get('primary_image')
        if primary_image and primary_image not in existing_images:
            image = ProductImage(
                product=product,
                image_url=primary_image
            )
            return [image]
        return []



class OzonController(BaseMarketplaceController):
    def __init__(self, session, marketplace):
        super().__init__(session, marketplace)
        self.product_synchronizer = OzonProductSynchronizer(session, marketplace, self.api)

    async def synchronize_products(self):
        await self.product_synchronizer.synchronize_products()

    async def create_products(self):
        await self.product_synchronizer.create_products()