#!/usr/bin/env python3
"""
#exonware/xwquery/src/exonware/xwquery/executors/graph/expand_executor.py
EXPAND Operation Executor - Multi-hop expansion (k-hop neighbors)
Company: eXonware.com
Author: eXonware Backend Team
Email: connect@exonware.com
Version: 0.0.1.8
Generation Date: 28-Oct-2025
"""

from typing import Any
from ..base import AUniversalOperationExecutor
from ....contracts import QueryAction, ExecutionContext, ExecutionResult


class ExpandExecutor(AUniversalOperationExecutor):
    """
    EXPAND operation executor - Multi-hop expansion (k-hop neighbors).
    Cypher: MATCH (n)-[*1..3]->(m)  # 1 to 3 hops
    Gremlin: g.V().repeat(out()).times(k)
    Reuses xwnode BFS for multi-hop traversal.
    """
    OPERATION_NAME = "EXPAND"

    def _do_execute(self, action: QueryAction, context: ExecutionContext) -> ExecutionResult:
        """Execute EXPAND operation."""
        params = action.params
        node = context.node
        result_data = self._execute_expand(node, params, context)
        return ExecutionResult(
            success=True,
            data=result_data,
            action_type=self.OPERATION_NAME,
            metadata={'operation': self.OPERATION_NAME}
        )

    def _execute_expand(self, node: Any, params: dict, context: ExecutionContext) -> dict:
        """
        Execute EXPAND - Multi-hop expansion.
        FUTURE: Will use xwnode BFS for k-hop neighbors.
        """
        min_hops = params.get('min_hops', 1)
        max_hops = params.get('max_hops', 3)
        direction = params.get('direction', 'out')  # in, out, both
        edge_type = params.get('edge_type')
        expanded_nodes = []
        # FUTURE: Use xwnode's BFS
        # for k in range(min_hops, max_hops + 1):
        #     k_hop_neighbors = graph.k_hop_neighbors(node, k=k, direction=direction, edge_type=edge_type)
        #     expanded_nodes.extend(k_hop_neighbors)
        return {
            'expanded_nodes': expanded_nodes,
            'min_hops': min_hops,
            'max_hops': max_hops,
            'direction': direction,
            'edge_type': edge_type,
            'count': len(expanded_nodes),
            'status': 'basic_implementation',
            'note': 'Will use xwnode BFS for k-hop neighbors'
        }
__all__ = ['ExpandExecutor']
