"""
Data models for sync operations.
"""
from dataclasses import dataclass, field
from datetime import datetime
from typing import Optional


# Entity type constants — single source of truth for queue names (all plural)
ENTITY_TYPE_CATALOGUE = "catalogues"
ENTITY_TYPE_MERCHANT = "merchants"
ENTITY_TYPE_EMPLOYEE = "employees"
ENTITY_TYPE_WAREHOUSE = "warehouses"
ENTITY_TYPE_UOM = "uom"

VALID_ENTITY_TYPES = {
    ENTITY_TYPE_CATALOGUE,
    ENTITY_TYPE_MERCHANT,
    ENTITY_TYPE_EMPLOYEE,
    ENTITY_TYPE_WAREHOUSE,
    ENTITY_TYPE_UOM,
}


@dataclass
class SyncOperation:
    """
    Model for tracking sync operations.
    
    Attributes:
        entity_type: Type of entity being synced ("merchant" | "catalogue" | "employee" | "warehouse")
        entity_id: Unique identifier of the entity
        operation: Type of operation ("create" | "update" | "activate" | "deactivate" | "delete")
        timestamp: When the sync operation was created
        retry_count: Number of retry attempts made
        last_error: Last error message if sync failed
    """
    entity_type: str
    entity_id: str
    operation: str
    timestamp: datetime = field(default_factory=datetime.utcnow)
    retry_count: int = 0
    last_error: Optional[str] = None
    
    def __post_init__(self):
        """Validate entity_type and operation values"""
        if self.entity_type not in VALID_ENTITY_TYPES:
            raise ValueError(f"entity_type must be one of {VALID_ENTITY_TYPES}, got {self.entity_type}")
        
        valid_operations = {"create", "update", "activate", "deactivate", "delete"}
        if self.operation not in valid_operations:
            raise ValueError(f"operation must be one of {valid_operations}, got {self.operation}")