"""
GroceryLinkBuilder — affiliate deeplinks for missing ingredient grocery lists.

Delegates URL wrapping to circuitforge_core.affiliates.wrap_url, which handles
the full resolution chain: opt-out → BYOK id → CF env var → plain URL.

Registered programs (via cf-core):
  amazon     — Amazon Associates (env: AMAZON_ASSOCIATES_TAG)
  instacart  — Instacart         (env: INSTACART_AFFILIATE_ID)

Walmart is kept inline until cf-core adds Impact network support:
  env: WALMART_AFFILIATE_ID

Links are always generated (plain URLs are useful even without affiliate IDs).
Walmart links only appear when WALMART_AFFILIATE_ID is set.
Instacart and Walmart are US/CA-only; other locales get Amazon only.
"""
from __future__ import annotations

import logging
import os
from urllib.parse import quote_plus

from circuitforge_core.affiliates import wrap_url

from app.models.schemas.recipe import GroceryLink
from app.services.recipe.locale_config import get_locale

logger = logging.getLogger(__name__)


def _amazon_link(ingredient: str, locale: str) -> GroceryLink:
    cfg = get_locale(locale)
    q = quote_plus(ingredient)
    domain = cfg["amazon_domain"]
    dept = cfg["amazon_grocery_dept"]
    base = f"https://www.{domain}/s?k={q}&{dept}"
    retailer = "Amazon" if locale != "us" else "Amazon Fresh"
    return GroceryLink(ingredient=ingredient, retailer=retailer, url=wrap_url(base, "amazon"))


def _instacart_link(ingredient: str, locale: str) -> GroceryLink:
    q = quote_plus(ingredient)
    if locale == "ca":
        base = f"https://www.instacart.ca/store/s?k={q}"
    else:
        base = f"https://www.instacart.com/store/s?k={q}"
    return GroceryLink(ingredient=ingredient, retailer="Instacart", url=wrap_url(base, "instacart"))


def _walmart_link(ingredient: str, affiliate_id: str) -> GroceryLink:
    q = quote_plus(ingredient)
    # Walmart uses Impact network — affiliate ID is in the redirect path, not a param
    url = (
        f"https://goto.walmart.com/c/{affiliate_id}/walmart"
        f"?u=https://www.walmart.com/search?q={q}"
    )
    return GroceryLink(ingredient=ingredient, retailer="Walmart Grocery", url=url)


class GroceryLinkBuilder:
    def __init__(self, tier: str = "free", has_byok: bool = False, locale: str = "us") -> None:
        self._tier = tier
        self._locale = locale
        self._locale_cfg = get_locale(locale)
        self._walmart_id = os.environ.get("WALMART_AFFILIATE_ID", "").strip()

    def build_links(self, ingredient: str) -> list[GroceryLink]:
        """Build grocery deeplinks for a single ingredient.

        Amazon link is always included, routed to the user's locale domain.
        Instacart and Walmart are only shown where they operate (US/CA).
        wrap_url handles affiliate ID injection for supported programs.
        """
        if not ingredient.strip():
            return []

        links: list[GroceryLink] = [_amazon_link(ingredient, self._locale)]

        if self._locale_cfg["instacart"]:
            links.append(_instacart_link(ingredient, self._locale))

        if self._locale_cfg["walmart"] and self._walmart_id:
            links.append(_walmart_link(ingredient, self._walmart_id))

        return links

    def build_all(self, ingredients: list[str]) -> list[GroceryLink]:
        """Build links for a list of ingredients."""
        links: list[GroceryLink] = []
        for ingredient in ingredients:
            links.extend(self.build_links(ingredient))
        return links