from __future__ import annotations

import logging
import threading
from typing import TYPE_CHECKING
from uuid import uuid4

from libs.attr_map import AttrMap

if TYPE_CHECKING:
    from core.sandbox.storage.sandbox_storage import SandboxStorage
    from core.virtual_environment.__base.virtual_environment import VirtualEnvironment

logger = logging.getLogger(__name__)


class Sandbox:
    """Represents a single sandbox environment.

    Each ``Sandbox`` owns a stable, path-safe ``id`` (a 32-char hex
    UUID4) that is independent of the underlying provider's environment
    ID.  Use ``sandbox.id`` for any path or resource namespacing
    (e.g. ``DifyCli(sandbox.id)``).

    The raw provider identifier is still accessible via
    ``sandbox.vm.metadata.id`` when needed (logging, API calls back to
    the provider, etc.).
    """

    def __init__(
        self,
        *,
        vm: VirtualEnvironment,
        storage: SandboxStorage,
        tenant_id: str,
        user_id: str,
        app_id: str,
        assets_id: str,
    ) -> None:
        self._id = uuid4().hex
        self._vm = vm
        self._storage = storage
        self._tenant_id = tenant_id
        self._user_id = user_id
        self._app_id = app_id
        self._assets_id = assets_id
        self._attributes = AttrMap()
        self._ready_event = threading.Event()
        self._cancel_event = threading.Event()
        self._init_error: Exception | None = None

    @property
    def id(self) -> str:
        """Stable, path-safe identifier for this sandbox (UUID4 hex)."""
        return self._id

    @property
    def attrs(self) -> AttrMap:
        return self._attributes

    @property
    def vm(self) -> VirtualEnvironment:
        return self._vm

    @property
    def storage(self) -> SandboxStorage:
        return self._storage

    @property
    def tenant_id(self) -> str:
        return self._tenant_id

    @property
    def user_id(self) -> str:
        return self._user_id

    @property
    def app_id(self) -> str:
        return self._app_id

    @property
    def assets_id(self) -> str:
        return self._assets_id

    def mark_ready(self) -> None:
        # Signal that sandbox initialization has completed successfully.
        self._ready_event.set()

    def mark_failed(self, error: Exception) -> None:
        # Capture initialization error and unblock waiters.
        self._init_error = error
        self._ready_event.set()

    def cancel_init(self) -> None:
        # Mark initialization as cancelled to stop background setup.
        self._cancel_event.set()
        self._ready_event.set()

    def is_cancelled(self) -> bool:
        return self._cancel_event.is_set()

    def wait_ready(self, timeout: float | None = None) -> None:
        # Block until initialization completes, fails, or is cancelled.
        if not self._ready_event.wait(timeout=timeout):
            raise TimeoutError("Sandbox initialization timed out")
        if self._cancel_event.is_set():
            raise RuntimeError("Sandbox initialization was cancelled")
        if self._init_error is not None:
            if isinstance(self._init_error, ValueError):
                raise RuntimeError(f"Sandbox initialization failed: {self._init_error}") from self._init_error
            else:
                raise RuntimeError("Sandbox initialization failed") from self._init_error

    def mount(self) -> bool:
        return self._storage.mount(self._vm)

    def unmount(self) -> bool:
        return self._storage.unmount(self._vm)

    def release(self) -> None:
        self.cancel_init()
        sandbox_id = self.id
        try:
            self._storage.unmount(self._vm)
            logger.info("Sandbox storage unmounted: sandbox_id=%s", sandbox_id)
        except Exception:
            logger.exception("Failed to unmount sandbox storage: sandbox_id=%s", sandbox_id)

        try:
            self._vm.release_environment()
            logger.info("Sandbox released: sandbox_id=%s", sandbox_id)
        except Exception:
            logger.exception("Failed to release sandbox: sandbox_id=%s", sandbox_id)