from __future__ import annotations

import os
import re
import tomllib
from dataclasses import dataclass
from pathlib import Path


ROOT = Path(__file__).resolve().parents[2]


def load_env(path: Path | None = None) -> None:
    env_path = path or ROOT / ".env"
    if not env_path.exists():
        return
    for raw in env_path.read_text(encoding="utf-8-sig").splitlines():
        line = raw.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        os.environ.setdefault(key.strip(), value.strip().strip('"').strip("'"))


@dataclass(frozen=True)
class ClientConfig:
    domain: str
    google_ads_customer_id: str
    adspro_client_id: str | None = None
    skip_in_all: tuple[str, ...] = ()
    rules: dict | None = None

    @property
    def safe_customer_id(self) -> str:
        return re.sub(r"\D", "", self.google_ads_customer_id)

    def effective_rules(self, global_rules: dict, section: str) -> dict:
        rules = dict(global_rules.get(section, {}))
        rules.update((self.rules or {}).get(section, {}))
        return rules


@dataclass(frozen=True)
class AppConfig:
    clients: dict[str, ClientConfig]
    global_rules: dict


def _string_tuple(value) -> tuple[str, ...]:
    if value is None:
        return ()
    if isinstance(value, str):
        values = [value]
    elif isinstance(value, (list, tuple, set)):
        values = value
    else:
        return ()
    return tuple(str(item).strip() for item in values if str(item).strip())


def load_config(path: Path | None = None) -> AppConfig:
    config_path = path or ROOT / "config" / "clients.toml"
    if not config_path.exists():
        example = ROOT / "config" / "clients.example.toml"
        raise FileNotFoundError(
            f"Brak {config_path}. Utworz ten plik na podstawie {example}."
        )
    data = tomllib.loads(config_path.read_text(encoding="utf-8"))
    clients = {}
    for domain, row in data.get("clients", {}).items():
        clients[domain] = ClientConfig(
            domain=domain,
            google_ads_customer_id=str(row["google_ads_customer_id"]),
            adspro_client_id=str(row.get("adspro_client_id")) if row.get("adspro_client_id") else None,
            skip_in_all=_string_tuple(row.get("skip_in_all")),
            rules={key: value for key, value in row.items() if isinstance(value, dict)},
        )
    return AppConfig(clients=clients, global_rules=data.get("global_rules", {}))


def client_dir(domain: str) -> Path:
    path = ROOT / "clients" / domain
    path.mkdir(parents=True, exist_ok=True)
    return path