"""Minimal shelter planner adapter for CrisisGuard MVP.

This adapter mirrors a simple use-case: apply updates to the shelter section
of the LocalPlan.contents to reflect allocations or changes in capacity.
"""

from __future__ import annotations

from crisisguard.core import LocalPlan, PlanDelta


def process(plan: LocalPlan, delta: PlanDelta) -> LocalPlan:
    new_shelter = plan.contents.get("shelter", {})
    updates = delta.updates.get("shelter", {}) if isinstance(delta.updates, dict) else {}
    if isinstance(updates, dict):
        # Merge shelter updates
        merged = dict(new_shelter)
        merged.update(updates)
        new_contents = dict(plan.contents)
        new_contents["shelter"] = merged
    else:
        new_contents = dict(plan.contents)

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