from __future__ import annotations
from dataclasses import dataclass, asdict
from typing import Dict, Any
import json

from .core import LocalProblem, PlanDelta


@dataclass
class LocalSolver:
    name: str = "toy-solver"

    def solve(self, problem: LocalProblem) -> PlanDelta:
        # Minimal toy objective: compute a simple plan delta based on price_target
        delta = {
            "contract_id": f"{problem.id}:{problem.venue}",
            "action": "place_order",
            "asset": problem.asset,
            "price_target": problem.price_target,
            "tolerance": problem.tolerance,
            "notes": "toy-arbitrage-step"
        }
        import datetime
        timestamp = datetime.datetime.utcnow().isoformat() + "Z"
        return PlanDelta(
            delta=delta,
            timestamp=timestamp,
            author=self.name,
            contract_id=f"{problem.id}:{problem.venue}",
            privacy_budget=0.0,
        )