"""Example fetcher: read products / stock from a local or remote JSON file.

Config (JSON in admin UI):
  {
    "url": "https://example.com/products.json",   // or omit for local path
    "path": "/absolute/or/relative/products.json",
    "stock_only": false
  }

Expected JSON shapes:
  { "products": [ {...}, ... ] }
  or a bare array of products.

For stock sync, each item needs at least: id|externalId|sku|slug and stock.
"""

from __future__ import annotations

import json
import urllib.request
from pathlib import Path

NAME = "Example JSON source"
DESCRIPTION = (
    "Import products or sync stock from a JSON URL/path. "
    "Replace this module with a real site-specific scraper when ready."
)


def _load_payload(config: dict):
    url = (config or {}).get("url")
    path = (config or {}).get("path")
    if url:
        req = urllib.request.Request(
            url,
            headers={"User-Agent": "KikomikoAdmin/1.0"},
        )
        with urllib.request.urlopen(req, timeout=60) as resp:
            return json.loads(resp.read().decode("utf-8"))
    if path:
        p = Path(path).expanduser()
        if not p.is_file():
            raise FileNotFoundError(f"JSON path not found: {p}")
        return json.loads(p.read_text(encoding="utf-8"))
    raise ValueError("config needs url or path")


def _as_list(payload):
    if isinstance(payload, list):
        return payload
    if isinstance(payload, dict):
        for key in ("products", "items", "data"):
            if isinstance(payload.get(key), list):
                return payload[key]
    raise ValueError("JSON must be a product array or {products:[...]}")


def fetch_products(config: dict):
    rows = _as_list(_load_payload(config))
    for row in rows:
        row.setdefault("source", "example_json")
    return rows


def sync_stocks(config: dict, products: list):
    """Return [{id|external_id|sku|slug, stock}, ...] for matching DB rows."""
    rows = _as_list(_load_payload(config))
    out = []
    for row in rows:
        if not isinstance(row, dict):
            continue
        stock = row.get("stock")
        if stock is None:
            continue
        out.append(
            {
                "id": row.get("id"),
                "external_id": row.get("externalId") or row.get("external_id"),
                "sku": row.get("sku"),
                "slug": row.get("slug"),
                "stock": int(stock),
            }
        )
    return out