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from pydantic import BaseModel, Field, ConfigDict
import redis.asyncio as redis
from typing import Dict, Any, Optional

class AutonomousExecutionContract(BaseModel):
    # Line-zero strict invariant enforcement: absolute ban on unstructured drift
    model_config = ConfigDict(extra="forbid", strict=True)
    
    transaction_id: str = Field(..., regex=r"^[A-Z0-9_-]{16,64}$")
    token_ceiling_usd: float = Field(..., ge=0.05, le=12.50)
    failover_route: str = Field(default="local_vllm_deepseek")
    dlq_quarantine_depth: int = Field(default=3)

async def enforce_rate_breaker(r: redis.Redis, tenant_id: str) -> bool:
    """Atomic Redis token-bucket preventing run-away recursive spending."""
    bucket_key = f"circuit:{tenant_id}"
    current_tokens = await r.decr(bucket_key)
    if current_tokens < 0:
        await r.lpush("dlq:emergency_halt", tenant_id)
        raise PermissionError(f"Circuit trip for {tenant_id}: token bucket exhausted")
    return True