"""Suggestions du solveur (OR-Tools CP-SAT). Ne persiste rien : la
coordination affecte elle-même, dans l'écran habituel, en tenant compte des
bénévoles remontés en tête de liste."""

import logging
import time
import uuid

from fastapi import APIRouter, Depends
from sqlmodel import Session

from app.api.deps import get_edition
from app.api.schemas import SolverRunResult, SolverSuggestion
from app.auth.deps import require_staff
from app.db import get_session
from app.models import Account, Edition
from app.solver import build_solver_input, solve

logger = logging.getLogger("app.solver")

router = APIRouter(prefix="/editions/{edition_id}/solver", tags=["solver"])


@router.post("/suggestions", response_model=SolverRunResult)
def run_solver(
    edition: Edition = Depends(get_edition),
    _guard: Account = Depends(require_staff),
    session: Session = Depends(get_session),
) -> SolverRunResult:
    started = time.monotonic()
    data = build_solver_input(session=session, edition=edition)
    loaded = time.monotonic()
    solution = solve(data)
    logger.info(
        "Solveur (édition %s) : %d créneaux, %d bénévoles, %d suggestions — "
        "chargement %d ms, résolution %d ms",
        edition.id,
        len(data.shifts),
        len(data.volunteers),
        len(solution.suggestions),
        (loaded - started) * 1000,
        (time.monotonic() - loaded) * 1000,
    )
    return SolverRunResult(
        suggestions=[
            SolverSuggestion(
                shift_id=uuid.UUID(s.shift_id),
                volunteer_ids=[uuid.UUID(v) for v in s.volunteer_ids],
            )
            for s in solution.suggestions
        ],
        shifts_considered=len(data.shifts),
        volunteers_considered=len(data.volunteers),
    )