"""Hermes shared fabric profile isolation primitives."""
from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
import os

from .tenant_context import ValidationError, require_ident


@dataclass(frozen=True)
class HermesProfile:
    tenant_id: str
    cell_id: str
    profile_id: str
    hermes_home: Path
    workspace: Path

    def __post_init__(self) -> None:
        require_ident("tenant_id", self.tenant_id, tenant=True)
        for name in ("cell_id", "profile_id"):
            require_ident(name, getattr(self, name))
        if not self.hermes_home.is_absolute() or not self.workspace.is_absolute():
            raise ValidationError("profile paths must be absolute")

    @property
    def environment(self) -> dict[str, str]:
        return {
            "HERMES_HOME": str(self.hermes_home),
            "HOME": str(self.hermes_home),
            "AIOS_TENANT_ID": self.tenant_id,
            "AIOS_CELL_ID": self.cell_id,
            "AIOS_PROFILE_ID": self.profile_id,
        }

    def prepare(self) -> None:
        self.hermes_home.mkdir(parents=True, exist_ok=True)
        self.workspace.mkdir(parents=True, exist_ok=True)
        os.chmod(self.hermes_home, 0o700)
        os.chmod(self.workspace, 0o700)

    def assert_path_allowed(self, path: str | Path) -> None:
        target = Path(path).resolve()
        for root in (self.hermes_home.resolve(), self.workspace.resolve()):
            if target == root or root in target.parents:
                return
        raise ValidationError("path escapes profile isolation boundary")