"""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}