"""GoMag API client - downloads orders and saves them as JSON files."""
import asyncio
import json
import logging
from datetime import datetime, timedelta
from pathlib import Path
from typing import Callable

import httpx

from ..config import settings

logger = logging.getLogger(__name__)


async def download_orders(
    json_dir: str,
    days_back: int = None,
    api_key: str = None,
    api_shop: str = None,
    limit: int = None,
    log_fn: Callable[[str], None] = None,
) -> dict:
    """Download orders from GoMag API and save as JSON files.

    Returns dict with keys: pages, total, files (list of saved file paths).
    If API keys are not configured, returns immediately with empty result.
    Optional api_key, api_shop, limit override config.settings values.
    """
    def _log(msg: str):
        logger.info(msg)
        if log_fn:
            log_fn(msg)

    effective_key = api_key or settings.GOMAG_API_KEY
    effective_shop = api_shop or settings.GOMAG_API_SHOP
    effective_limit = limit or settings.GOMAG_LIMIT

    if not effective_key or not effective_shop:
        _log("GoMag API keys neconfigurați, skip download")
        return {"pages": 0, "total": 0, "files": []}

    if days_back is None:
        days_back = settings.GOMAG_ORDER_DAYS_BACK

    start_date = (datetime.now() - timedelta(days=days_back)).strftime("%Y-%m-%d")
    out_dir = Path(json_dir)
    out_dir.mkdir(parents=True, exist_ok=True)

    # Clean old JSON files before downloading new ones
    old_files = list(out_dir.glob("gomag_orders*.json"))
    if old_files:
        for f in old_files:
            f.unlink()
        _log(f"Șterse {len(old_files)} fișiere JSON vechi")

    headers = {
        "Apikey": effective_key,
        "ApiShop": effective_shop,
        "User-Agent": "Mozilla/5.0",
        "Content-Type": "application/json",
    }

    saved_files = []
    total_orders = 0
    total_pages = 1
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")

    async with httpx.AsyncClient(timeout=30) as client:
        page = 1
        while page <= total_pages:
            params = {
                "startDate": start_date,
                "page": page,
                "limit": effective_limit,
            }
            try:
                response = await client.get(settings.GOMAG_API_URL, headers=headers, params=params)
                response.raise_for_status()
                data = response.json()
            except httpx.HTTPError as e:
                _log(f"GoMag API eroare pagina {page}: {e}")
                break
            except Exception as e:
                _log(f"GoMag eroare neașteptată pagina {page}: {e}")
                break

            # Update totals from first page response
            if page == 1:
                total_orders = int(data.get("total", 0))
                total_pages = int(data.get("pages", 1))
                _log(f"GoMag: {total_orders} comenzi în {total_pages} pagini (startDate={start_date})")

            filename = out_dir / f"gomag_orders_page{page}_{timestamp}.json"
            filename.write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8")
            saved_files.append(str(filename))
            _log(f"GoMag: pagina {page}/{total_pages} salvată → {filename.name}")

            page += 1
            if page <= total_pages:
                await asyncio.sleep(1)

    return {"pages": total_pages, "total": total_orders, "files": saved_files}


async def download_products(
    api_key: str = None,
    api_shop: str = None,
    products_url: str = None,
    log_fn: Callable[[str], None] = None,
) -> list[dict]:
    """Download all products from GoMag Products API.
    Returns list of product dicts with: sku, price, vat, vat_included, bundleItems.
    """
    def _log(msg: str):
        logger.info(msg)
        if log_fn:
            log_fn(msg)

    effective_key = api_key or settings.GOMAG_API_KEY
    effective_shop = api_shop or settings.GOMAG_API_SHOP
    default_url = "https://api.gomag.ro/api/v1/product/read/json"
    effective_url = products_url or default_url

    if not effective_key or not effective_shop:
        _log("GoMag API keys neconfigurați, skip product download")
        return []

    headers = {
        "Apikey": effective_key,
        "ApiShop": effective_shop,
        "User-Agent": "Mozilla/5.0",
        "Content-Type": "application/json",
    }

    all_products = []
    total_pages = 1

    async with httpx.AsyncClient(timeout=30) as client:
        page = 1
        while page <= total_pages:
            params = {"page": page, "limit": 100}
            try:
                response = await client.get(effective_url, headers=headers, params=params)
                response.raise_for_status()
                data = response.json()
            except httpx.HTTPError as e:
                _log(f"GoMag Products API eroare pagina {page}: {e}")
                break
            except Exception as e:
                _log(f"GoMag Products eroare neașteptată pagina {page}: {e}")
                break

            if page == 1:
                total_pages = int(data.get("pages", 1))
                _log(f"GoMag Products: {data.get('total', '?')} produse în {total_pages} pagini")

            products = data.get("products", [])
            if isinstance(products, dict):
                # GoMag returns products as {"1": {...}, "2": {...}} dict
                first_val = next(iter(products.values()), None) if products else None
                if isinstance(first_val, dict):
                    products = list(products.values())
                else:
                    products = [products]
            if isinstance(products, list):
                for p in products:
                    if isinstance(p, dict) and p.get("sku"):
                        all_products.append({
                            "sku": p["sku"],
                            "price": p.get("price", "0"),
                            "vat": p.get("vat", "19"),
                            "vat_included": p.get("vat_included", "1"),
                            "bundleItems": p.get("bundleItems", []),
                        })

            page += 1
            if page <= total_pages:
                await asyncio.sleep(1)

    _log(f"GoMag Products: {len(all_products)} produse cu SKU descărcate")
    return all_products