import json
import os
from dataclasses import dataclass
from pathlib import Path
from typing import Optional, Tuple

BASE_URL = "https://www.adultdvdmarketplace.com/xcart"
HOME_URL = f"{BASE_URL}/"
LOGIN_URL = f"{BASE_URL}/home.php?area=G"
DISCLAIMER_URL = "https://www.adultdvdmarketplace.com/xcart/adult_dvd/disclaimer.php"
DEFAULT_CREDENTIALS_FILE = ".browser_state/credentials.json"


def load_credentials(credentials_file: str = DEFAULT_CREDENTIALS_FILE) -> Tuple[Optional[str], Optional[str], str]:
    username = os.getenv("ADULTDVD_USERNAME")
    password = os.getenv("ADULTDVD_PASSWORD")
    if username and password:
        return username, password, "env"

    path = Path(credentials_file)
    if not path.exists():
        return None, None, "missing"

    try:
        data = json.loads(path.read_text(encoding="utf-8"))
    except Exception:
        return None, None, "invalid-file"

    username = (data.get("username") or "").strip()
    password = data.get("password") or ""
    if username and password:
        return username, password, "credentials-file"
    return None, None, "invalid-file"


def save_credentials(username: str, password: str, credentials_file: str = DEFAULT_CREDENTIALS_FILE) -> None:
    path = Path(credentials_file)
    path.parent.mkdir(parents=True, exist_ok=True)
    payload = {"username": username, "password": password}
    path.write_text(json.dumps(payload, indent=2), encoding="utf-8")


@dataclass
class BotConfig:
    username: str
    password: str
    studio_url: str
    min_price: float
    output_format: str = "csv"          # csv | excel | both
    output_file: Optional[str] = None
    headless: bool = False
    max_items: Optional[int] = None
    timeout: int = 30000                # ms
    retry_count: int = 3
    state_dir: str = ".browser_state"

    def get_studio_url_with_sort(self) -> str:
        url = self.studio_url
        if "order_by=" not in url:
            sep = "&" if "?" in url else "?"
            url = f"{url}{sep}order_by=price"
        return url