from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path


_PROJECT_ROOT = Path(__file__).resolve().parents[1]


@dataclass(frozen=True)
class GatewayConfig:
    everos_base_url: str = "http://127.0.0.1:8000"
    database_path: Path = _PROJECT_ROOT / "data" / "memory_gateway.sqlite3"
    storage_dir: Path = _PROJECT_ROOT / "data" / "storage"
    resource_search_batch_size: int = 50

    @classmethod
    def from_env(cls) -> GatewayConfig:
        return cls(
            everos_base_url=os.environ.get(
                "EVEROS_BASE_URL",
                "http://127.0.0.1:8000",
            ).rstrip("/"),
            database_path=Path(
                os.environ.get(
                    "MEMORY_GATEWAY_DB_PATH",
                    str(_PROJECT_ROOT / "data" / "memory_gateway.sqlite3"),
                )
            ),
            storage_dir=Path(
                os.environ.get(
                    "MEMORY_GATEWAY_STORAGE_DIR",
                    str(_PROJECT_ROOT / "data" / "storage"),
                )
            ),
            resource_search_batch_size=int(
                os.environ.get("MEMORY_GATEWAY_RESOURCE_SEARCH_BATCH_SIZE", "50")
            ),
        )