from __future__ import annotations

import os
from functools import lru_cache
from pathlib import Path


ROOT_DIR = Path(__file__).resolve().parent.parent


def _read_env_file(path: Path) -> dict[str, str]:
    values: dict[str, str] = {}
    if not path.exists():
        return values
    for raw_line in path.read_text(encoding="utf-8").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        key = key.strip()
        value = value.strip().strip('"').strip("'")
        if key:
            values[key] = value
    return values


def _load_env_files() -> None:
    loaded: dict[str, str] = {}
    for path in [
        ROOT_DIR / ".env",
        ROOT_DIR / ".env.local",
        ROOT_DIR / "backend" / ".env",
        ROOT_DIR / "backend" / ".env.local",
    ]:
        loaded.update(_read_env_file(path))
    for key, value in loaded.items():
        os.environ.setdefault(key, value)


_load_env_files()


def _split_csv(value: str) -> list[str]:
    return [item.strip() for item in value.split(",") if item.strip()]


def _bool_env(name: str, default: str = "false") -> bool:
    return os.getenv(name, default).lower() in {"1", "true", "yes", "on"}


class Settings:
    def __init__(self) -> None:
        self.pb_url = (
            os.getenv("PB_INTERNAL_URL")
            or os.getenv("POCKETBASE_INTERNAL_URL")
            or os.getenv("PB_URL")
            or os.getenv("POCKETBASE_URL")
            or "http://127.0.0.1:8090"
        ).rstrip("/")
        self.pb_admin_email = (
            os.getenv("PB_ADMIN_EMAIL")
            or os.getenv("POCKETBASE_EMAIL")
            or "admin@nomadcna.local"
        )
        self.pb_admin_password = (
            os.getenv("PB_ADMIN_PASSWORD")
            or os.getenv("POCKETBASE_PASSWORD")
            or "NomadCNA123456"
        )
        self.cookie_name = os.getenv("API_COOKIE_NAME", "pb_session")
        self.frontend_origins = _split_csv(
            os.getenv(
                "FRONTEND_ORIGINS",
                "http://localhost:3001,http://127.0.0.1:3001",
            )
        )
        self.upload_dir = Path(os.getenv("UPLOAD_DIR", "backend/uploads"))
        self.app_env = os.getenv("APP_ENV", "development").strip().lower()
        self.dev_auto_pay = _bool_env("DEV_AUTO_PAY", "false")
        self.site_id = os.getenv("SITE_ID") or os.getenv("NEXT_PUBLIC_SITE_ID") or "meetup"
        self.base_url = (
            os.getenv("API_PUBLIC_BASE_URL")
            or os.getenv("BASE_URL")
            or os.getenv("PAYMENT_API_URL")
            or os.getenv("NEXT_PUBLIC_API_BASE_URL")
            or "http://127.0.0.1:8000"
        ).rstrip("/")
        if self.base_url == "/api":
            self.base_url = (os.getenv("NEXT_PUBLIC_SITE_URL") or "http://127.0.0.1:3001").rstrip("/")
        self.upload_public_base_url = (
            os.getenv("UPLOAD_PUBLIC_BASE_URL")
            or os.getenv("API_PUBLIC_BASE_URL")
            or os.getenv("BASE_URL")
            or self.base_url
        ).rstrip("/")
        self.email_auth_password = os.getenv("EMAIL_AUTH_PASSWORD", "NomadCNAEmailLogin2026!")
        self.google_client_id = os.getenv("GOOGLE_CLIENT_ID") or os.getenv("NEXT_PUBLIC_GOOGLE_CLIENT_ID") or ""
        self.payment_provider = os.getenv("PAYMENT_PROVIDER", "zpay").lower()
        self.payment_default_amount = int(os.getenv("PAYMENT_DEFAULT_AMOUNT", "100") or "100")
        self.payment_join_amount = int(os.getenv("PAYMENT_JOIN_AMOUNT", str(self.payment_default_amount)) or str(self.payment_default_amount))
        self.payment_join_type = os.getenv("PAYMENT_JOIN_TYPE", "meetup")
        self.zpay_pid = os.getenv("ZPAY_PID", "2025121809351743")
        self.zpay_key = os.getenv("ZPAY_KEY", "tpEi7wWIWI2kXiYVTpIG6j7it0mjVW89")
        self.zpay_submit_url = os.getenv("ZPAY_SUBMIT_URL", "https://zpayz.cn/submit.php")
        self.zpay_mapi_url = os.getenv("ZPAY_MAPI_URL", "https://zpayz.cn/mapi.php")
        self.zpay_query_url = os.getenv("ZPAY_QUERY_URL", "https://zpayz.cn/api.php")
        self.xorpay_aid = os.getenv("XORPAY_AID", "8220")
        self.xorpay_secret = os.getenv("XORPAY_SECRET", "afcacd99570945f88de62624aaa3578e")
        self.xorpay_cashier_url = os.getenv("XORPAY_CASHIER_URL", "https://xorpay.com/api/cashier")
        self.xorpay_query_url = os.getenv("XORPAY_QUERY_URL", "https://xorpay.com/api/query2")


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()