#!/usr/bin/env python3
"""
Datalog Query Strategy

This module implements the Datalog query strategy for Datalog operations.

Company: eXonware.com
Author: eXonware Backend Team
Email: connect@exonware.com
Version: 0.0.1.9
Generation Date: January 2, 2025
"""

from typing import Any
from .base import AStructuredQueryStrategy
from exonware.xwnode.errors import XWNodeValueError
from exonware.xwnode.contracts import QueryMode, QueryTrait


class DatalogStrategy(AStructuredQueryStrategy):
    """Datalog query strategy for Datalog operations."""
    
    def __init__(self, **options):
        super().__init__(**options)
        self._mode = QueryMode.DATALOG
        self._traits = QueryTrait.STRUCTURED | QueryTrait.ANALYTICAL | QueryTrait.BATCH
    
    def execute(self, query: str, **kwargs) -> Any:
        """Execute Datalog query."""
        if not self.validate_query(query):
            raise XWNodeValueError(f"Invalid Datalog query: {query}")
        return {"result": "Datalog query executed", "query": query}
    
    def validate_query(self, query: str) -> bool:
        """Validate Datalog query syntax."""
        if not query or not isinstance(query, str):
            return False
        return any(op in query for op in [":-", "?", "!", "assert", "retract"])
    
    def get_query_plan(self, query: str) -> dict[str, Any]:
        """Get Datalog query execution plan."""
        return {
            "query_type": "Datalog",
            "complexity": "HIGH",
            "estimated_cost": 200
        }
    
    def select_query(self, table: str, columns: list[str], where_clause: str = None) -> Any:
        """Execute SELECT query."""
        return self.execute(f"?- {table}({', '.join(columns)})")
    
    def insert_query(self, table: str, data: dict[str, Any]) -> Any:
        """Execute INSERT query."""
        return self.execute(f"assert({table}({', '.join(data.values())}))")
    
    def update_query(self, table: str, data: dict[str, Any], where_clause: str = None) -> Any:
        """Execute UPDATE query."""
        return self.execute(f"retract({table}({where_clause})), assert({table}({', '.join(data.values())}))")
    
    def delete_query(self, table: str, where_clause: str = None) -> Any:
        """Execute DELETE query."""
        return self.execute(f"retract({table}({where_clause}))")
    
    def join_query(self, tables: list[str], join_conditions: list[str]) -> Any:
        """Execute JOIN query."""
        return self.execute(f"?- {tables[0]}(X), {tables[1]}(X)")
    
    def aggregate_query(self, table: str, functions: list[str], group_by: list[str] = None) -> Any:
        """Execute aggregate query."""
        return self.execute(f"?- {table}(X), aggregate({functions[0]}, X)")
