"""CatOpt bridge (MVP): CosmosMesh primitives <-> CatOpt-like representation.

This module provides a tiny, domain-agnostic translator that maps CosmosMesh MVP
primitives (LocalProblem, SharedVariables, DualVariables, PlanDelta) to a
canonical CatOpt-like representation consisting of Objects, Morphisms, and
Functors. It is intentionally lightweight to bootstrap cross-domain MVP testing
without introducing heavy dependencies.
"""
from __future__ import annotations

from typing import Any, Dict

from .dsl_sketch import LocalProblemDSL, SharedVariablesDSL, PlanDeltaDSL


class CatOptBridge:
    """Lightweight translator between CosmosMesh primitives and CatOpt-like signals.

    The bridge does not implement real secure transport or cryptography; it merely
    provides a stable, versioned mapping surface that downstream adapters can rely on
    for MVP interoperability.
    """

    def __init__(self) -> None:
        # Simple in-memory registry of versions for contracts lived in this bridge
        self._registry: Dict[str, str] = {
            "LocalProblem": "0.1",
            "SharedVariables": "0.1",
            "DualVariables": "0.1",
            "PlanDelta": "0.1",
        }

    def contract_version(self, contract_name: str) -> str:
        return self._registry.get(contract_name, "0.0")

    # --- Translation helpers (minimal stubs) ---
    def to_catopt_object(self, lp: LocalProblemDSL) -> Dict[str, Any]:
        """Translate a LocalProblem DSL instance to a CatOpt Object.

        The output is a simple dictionary suitable for JSON-like transport.
        """
        return {
            "type": "LocalProblemObject",
            "version": self.contract_version("LocalProblem"),
            "payload": {
                "agent_id": lp.agent_id,
                "variables": lp.variables,
                "objective": lp.objective,
                "constraints": lp.constraints,
            },
        }

    def from_catopt_object(self, payload: Dict[str, Any]) -> LocalProblemDSL:
        """Reverse-translate a CatOpt Object payload back into a LocalProblemDSL.

        This is intentionally permissive for MVP testing; adapters can extend as needed.
        """
        p = payload.get("payload", {})
        return LocalProblemDSL(
            agent_id=str(p.get("agent_id", "unknown")),
            objective=p.get("objective", ""),
            variables=p.get("variables", []),
            constraints=p.get("constraints", []),
        )

    def to_plan_delta(self, delta: PlanDeltaDSL) -> Dict[str, Any]:
        """Serialize a PlanDelta to a canonical CatOpt-like signal."""
        return {
            "type": "PlanDelta",
            "version": self.contract_version("PlanDelta"),
            "payload": delta.dict(),
        }

    def __repr__(self) -> str:
        return f"<CatOptBridge contracts={list(self._registry.keys())}>"