"""Minimal supply-chain adapter for CrisisGuard MVP.

This adapter demonstrates how a delta can modify the LocalPlan's
contents to reflect updated resource allocations. It merges the delta's
updates into the plan contents and bumps the version.
"""

from __future__ import annotations

from crisisguard.core import LocalPlan, PlanDelta


def process(plan: LocalPlan, delta: PlanDelta) -> LocalPlan:
    """Apply a delta to the plan's contents in a deterministic way.

    This is a lightweight, toy implementation suitable for a sandbox MVP.
    """
    # Deep copy-like behavior for nested dictionaries (simple approach here)
    new_contents = {k: v for k, v in plan.contents.items()}
    for k, v in delta.updates.items():
        # Merge/overwrite at top-level keys; nested dicts could be merged more deeply if needed
        if isinstance(v, dict) and isinstance(new_contents.get(k), dict):
            merged = dict(new_contents[k])
            merged.update(v)
            new_contents[k] = merged
        else:
            new_contents[k] = v

    return LocalPlan(
        plan_id=plan.plan_id,
        neighborhood=plan.neighborhood,
        contents=new_contents,
        version=plan.version + 1,
        timestamp=plan.timestamp,
    )