"""Load config from JSON and/or environment."""

from __future__ import annotations

import json
import os
from pathlib import Path
from typing import Any

from zerto_rewind_mcp.catalog import MutatingCatalog


def _env(name: str, default: str | None = None) -> str | None:
    value = os.environ.get(name)
    if value is None or value == "":
        return default
    return value


def load_config(path: str | Path | None = None) -> dict[str, Any]:
    config_path = Path(path or _env("ZERTO_REWIND_CONFIG") or "config.json")
    data: dict[str, Any] = {}
    if config_path.exists():
        data = json.loads(config_path.read_text(encoding="utf-8"))
        data["_config_path"] = str(config_path.resolve())
    data.setdefault("zerto_url", _env("ZERTO_URL", ""))
    data.setdefault("username", _env("ZERTO_USERNAME", ""))
    data.setdefault("password", _env("ZERTO_PASSWORD", ""))
    data.setdefault("client_id", _env("ZERTO_CLIENT_ID", "zerto-client"))
    verify = _env("ZERTO_VERIFY_TLS")
    if verify is not None:
        data["verify_tls"] = verify.lower() not in {"0", "false", "no"}
    else:
        data.setdefault("verify_tls", False)
    data.setdefault("recovery_dir", _env("ZERTO_RECOVERY_DIR", "./recovered"))
    data.setdefault("mutating_tools", data.get("mutating_tools") or [])
    return data


def load_catalog(data: dict[str, Any]) -> MutatingCatalog:
    path = Path(data["_config_path"]) if data.get("_config_path") else None
    return MutatingCatalog.from_config(data, path=path)