"""Pure-domain exceptions.

This layer must not import :mod:`packages.shared` (enforced by import-linter),
so it defines its own error types. Adapters translate them into
:class:`packages.shared.errors.AppError` at the boundary.
"""

from __future__ import annotations


class DomainError(Exception):
    """Base class for all pure-domain rule violations."""


class QuotaExceededError(DomainError):
    def __init__(self, *, required: int, remaining: int) -> None:
        self.required = required
        self.remaining = remaining
        super().__init__(f"quota exceeded: required={required} remaining={remaining}")


class InvalidTaskTransitionError(DomainError):
    def __init__(self, *, current: str, target: str) -> None:
        self.current = current
        self.target = target
        super().__init__(f"invalid task transition: {current} -> {target}")