import datetime as dt
import uuid

from app.models import Role
from tests.factories import dt_at, make_artist, make_position, make_shift, make_volunteer


def _url(edition, suffix=""):
    return f"/editions/{edition.id}/solver{suffix}"


def test_suggests_a_free_volunteer_for_an_understaffed_shift(client, edition, session):
    position = make_position(session, edition)
    shift = make_shift(
        session, edition, position,
        start=dt_at(10, 14), end=dt_at(10, 18), min_staff=1, ideal_staff=1,
    )
    volunteer = make_volunteer(session, edition, email="v@ex.fr")

    resp = client.post(_url(edition, "/suggestions"))
    assert resp.status_code == 200
    body = resp.json()
    assert body["shifts_considered"] == 1
    assert body["volunteers_considered"] == 1
    suggestion = next(s for s in body["suggestions"] if s["shift_id"] == str(shift.id))
    assert suggestion["volunteer_ids"] == [str(volunteer.id)]


def test_fully_staffed_shift_has_no_suggestion(client, edition, session):
    from app.models import Assignment

    position = make_position(session, edition)
    shift = make_shift(
        session, edition, position,
        start=dt_at(10, 14), end=dt_at(10, 18), min_staff=1, ideal_staff=1,
    )
    volunteer = make_volunteer(session, edition, email="v@ex.fr")
    session.add(
        Assignment(edition_id=edition.id, volunteer_id=volunteer.id, shift_id=shift.id)
    )
    session.commit()

    resp = client.post(_url(edition, "/suggestions"))
    assert resp.status_code == 200
    shift_ids = {s["shift_id"] for s in resp.json()["suggestions"]}
    assert str(shift.id) not in shift_ids


def test_avoids_volunteer_whose_wished_artist_would_be_missed(client, edition, session):
    position = make_position(session, edition)
    shift = make_shift(
        session, edition, position,
        start=dt_at(10, 14), end=dt_at(10, 18), min_staff=1, ideal_staff=1,
    )
    artist = make_artist(
        session, edition,
        performance_date=dt.date(2026, 7, 10),
        start_time=dt.time(15, 0), end_time=dt.time(16, 0),
    )
    fan = make_volunteer(session, edition, email="fan@ex.fr")
    assert client.patch(
        f"/editions/{edition.id}/volunteers/{fan.id}",
        json={"artist_ids": [str(artist.id)]},
    ).status_code == 200
    indiff = make_volunteer(session, edition, email="indiff@ex.fr")

    resp = client.post(_url(edition, "/suggestions"))
    suggestion = next(
        s for s in resp.json()["suggestions"] if s["shift_id"] == str(shift.id)
    )
    assert suggestion["volunteer_ids"] == [str(indiff.id)]


def test_chain_penalty_applies_across_different_positions(client, edition, session):
    from app.models import Assignment, PositionCategory

    # Deux postes différents, même jour, repos suffisant (8 h pile) entre les
    # deux créneaux : seul le chaînage (n'importe quel poste) doit
    # différencier les deux bénévoles pour le second créneau.
    bar = make_position(session, edition, name="Bar")
    entrance = make_position(session, edition, name="Entrée", category=PositionCategory.WELCOME)

    morning_shift = make_shift(
        session, edition, bar,
        start=dt_at(10, 8), end=dt_at(10, 12), min_staff=1, ideal_staff=1,
    )
    evening_shift = make_shift(
        session, edition, entrance,
        start=dt_at(10, 20), end=dt_at(10, 23), min_staff=1, ideal_staff=1,
    )
    chained = make_volunteer(session, edition, email="chained@ex.fr")
    session.add(
        Assignment(edition_id=edition.id, volunteer_id=chained.id, shift_id=morning_shift.id)
    )
    session.commit()
    fresh = make_volunteer(session, edition, email="fresh@ex.fr")

    resp = client.post(_url(edition, "/suggestions"))
    suggestion = next(
        s for s in resp.json()["suggestions"] if s["shift_id"] == str(evening_shift.id)
    )
    assert suggestion["volunteer_ids"] == [str(fresh.id)]


def test_unknown_edition_is_404(client):
    assert client.post(f"/editions/{uuid.uuid4()}/solver/suggestions").status_code == 404


def test_volunteer_role_forbidden(edition, session, make_account, as_account):
    account = make_account(Role.VOLUNTEER, email="v@e.fr")
    api = as_account(account)
    assert api.post(_url(edition, "/suggestions")).status_code == 403


def test_does_not_persist_any_assignment(client, edition, session):
    from sqlmodel import select

    from app.models import Assignment

    position = make_position(session, edition)
    make_shift(session, edition, position, start=dt_at(10, 14), end=dt_at(10, 18))
    make_volunteer(session, edition, email="v@ex.fr")

    client.post(_url(edition, "/suggestions"))
    assert session.exec(select(Assignment)).all() == []