from pydantic import BaseModel, Field
from typing import Dict, Any, Optional

class NormalizedEvent(BaseModel):
    """跨链与跨合约的标准归一化事件 (Layer 2)"""
    chain_id: int
    block_number: int
    tx_hash: str
    log_index: int
    event_type: str = Field(description="e.g. MARKET_CREATED, MINT_COLLATERAL, REDEEM_OT, RESOLVE_OUTCOME, CLAIM")
    contract_address: str
    payload: Dict[str, Any]
    timestamp: int

    @property
    def event_id(self) -> str:
        """全局唯一幂等标识 (Idempotency Key)"""
        return f"{self.chain_id}:{self.tx_hash}:{self.log_index}"