from dataclasses import dataclass
from enum import StrEnum


class QuotaStrategyType(StrEnum):
    """Email campaign quota allocation strategy types."""

    FAIR_DISTRIBUTION = "fair_distribution"
    FCFS = "fcfs"


@dataclass(frozen=True)
class QuotaAllocation:
    """Quota allocation for a single batch."""

    batch_id: int
    campaign_id: str
    emails_to_send: int