"""
A2A Bridge Stub
═══════════════
Agent-to-Agent protocol bridge for cross-agent federation.

This is a stub. The full A2A implementation requires:
  - AgentCard discovery endpoint
  - Task / Artifact message passing
  - SSE streaming for async tasks
  - Federation-wide identity resolution (F11)
"""

from __future__ import annotations

from typing import Any


class A2ABridge:
    """Stub A2A bridge for cross-agent routing."""

    def __init__(self, gateway_url: str = "") -> None:
        self.gateway_url = gateway_url or "https://arifosmcp.arif-fazil.com"
        self.agents: dict[str, Any] = {}

    def discover(self, agent_id: str) -> dict[str, Any]:
        """Discover an agent's capabilities (stub)."""
        return {
            "agent_id": agent_id,
            "status": "unknown",
            "capabilities": [],
            "endpoint": None,
        }

    def route(self, target_agent: str, payload: dict[str, Any]) -> dict[str, Any]:
        """Route a payload to a target agent (stub)."""
        return {
            "target": target_agent,
            "status": "routed_stub",
            "payload_size": len(str(payload)),
        }

    def handshake(self, remote_endpoint: str) -> dict[str, Any]:
        """Perform A2A handshake with a remote endpoint (stub)."""
        return {
            "remote": remote_endpoint,
            "status": "handshake_stub",
            "identity_verified": False,
            "note": "Full A2A implementation pending.",
        }
