"""Jeu de données de démonstration.

    docker compose run --rm backend uv run python -m app.seed

Idempotent : supprime l'édition de démonstration existante puis la recrée.
Déterministe (graine fixe). Aucune donnée nominative réelle.
"""

import datetime as dt
import random
from collections import Counter
from dataclasses import dataclass, field

from sqlalchemy import delete
from sqlmodel import Session, select

from app.auth.passwords import hash_password
from app.db import engine
from app.importing.text import normalize
from app.models import (
    Account,
    Artist,
    Assignment,
    AssignmentSource,
    Availability,
    DayPart,
    Edition,
    Position,
    PositionCategory,
    Role,
    Shift,
    Volunteer,
    VolunteerArtist,
    VolunteerCompanionWish,
    VolunteerPositionWish,
)
from app.validation import (
    AvailabilityWindow,
    DayPartWindow,
    Severity,
    ShiftInfo,
    ValidationInput,
    validate,
)
from app.validation.loader import build_validation_input

SEED = 20260709
DEMO_EDITION_NAME = "Festival des Lucioles"
DEMO_COORDINATION_PASSWORD = "coordination-lucioles-2026"
DEMO_YEAR = 2026
START = dt.date(2026, 10, 30)
END = dt.date(2026, 10, 31)

FIRST_NAMES = [
    "Camille",
    "Léa",
    "Hugo",
    "Nathan",
    "Emma",
    "Lucas",
    "Chloé",
    "Louis",
    "Manon",
    "Jules",
    "Sarah",
    "Tom",
    "Inès",
    "Théo",
    "Jade",
    "Raphaël",
    "Alice",
    "Gabriel",
    "Louise",
    "Adam",
    "Zoé",
    "Arthur",
    "Lina",
    "Paul",
    "Rose",
    "Noah",
    "Anna",
    "Ethan",
    "Mila",
    "Sacha",
    "Lou",
    "Naël",
    "Ambre",
    "Liam",
    "Juliette",
    "Maël",
    "Nina",
    "Aaron",
    "Éva",
    "Timéo",
]
LAST_NAMES = [
    "Martin",
    "Bernard",
    "Dubois",
    "Thomas",
    "Robert",
    "Richard",
    "Petit",
    "Durand",
    "Leroy",
    "Moreau",
    "Simon",
    "Laurent",
    "Lefebvre",
    "Michel",
    "Garcia",
    "David",
    "Bertrand",
    "Roux",
    "Vincent",
    "Fournier",
    "Morel",
    "Girard",
    "André",
    "Lefevre",
    "Mercier",
    "Dupont",
    "Lambert",
    "Bonnet",
    "François",
    "Martinez",
    "Legrand",
    "Garnier",
    "Faure",
    "Rousseau",
    "Blanc",
    "Guerin",
    "Muller",
    "Henry",
    "Roussel",
    "Nicolas",
]

_C = PositionCategory
# (nom, catégorie, lieu, _ inutilisé)
POSITIONS: list[tuple[str, PositionCategory, str, list[str]]] = [
    ("Bar extérieur", _C.BAR, "", []),
    ("Entrées", _C.BAR, "", []),
    ("Tickets", _C.BAR, "", []),
    ("Propreté", _C.BAR, "", []),
    ("Bar à vin", _C.BAR, "", []),
    ("Bar à bières", _C.BAR, "", []),
    ("Backstage", _C.BAR, "", []),
    ("Restauration", _C.BAR, "", []),
    ("Catering", _C.BAR, "", []),
    ("Plonge", _C.BAR, "", []),
    ("Prévention", _C.BAR, "", []),
    ("Bus", _C.BAR, "", []),
    ("Mécénat", _C.BAR, "", []),
    ("Accueil artiste", _C.BAR, "", []),
    ("Trésorie", _C.BAR, "", []),
    ("Communication", _C.BAR, "", []),
]

# fenêtres horaires (heure de début, heure de fin ; > 24 ⇒ le lendemain)
_WINDOWS: dict[PositionCategory, dict[str, list[tuple[int, int]]]] = {
    _C.BAR: {"montage": [(16, 20)], "festival": [(12, 17), (17, 23)], "demontage": []},
    _C.TICKETING: {"montage": [(14, 18)], "festival": [(9, 15), (15, 21)], "demontage": [(9, 13)]},
    _C.WELCOME: {"montage": [(13, 18)], "festival": [(9, 15), (15, 21)], "demontage": [(9, 13)]},
    _C.PARKING: {"montage": [(9, 13)], "festival": [(8, 14), (14, 20)], "demontage": [(9, 15)]},
    _C.CLEANING: {
        "montage": [(8, 12)],
        "festival": [(7, 11), (23, 27)],
        "demontage": [(8, 14), (14, 18)],
    },
    _C.CATERING: {
        "montage": [(7, 10), (11, 15), (18, 22)],
        "festival": [(7, 10), (11, 15), (18, 22)],
        "demontage": [(7, 10), (11, 15)],
    },
    _C.SETUP: {
        "montage": [(8, 12), (13, 18)],
        "festival": [(9, 12)],
        "demontage": [(9, 13), (14, 18)],
    },
    _C.STAGE: {"montage": [(10, 16)], "festival": [(14, 19), (19, 26)], "demontage": [(10, 15)]},
    _C.OTHER: {"montage": [(9, 17)], "festival": [(12, 20), (20, 28)], "demontage": [(9, 15)]},
}
_STAFF: dict[PositionCategory, tuple[int, int]] = {
    _C.BAR: (3, 6),
    _C.TICKETING: (2, 3),
    _C.WELCOME: (2, 4),
    _C.PARKING: (2, 4),
    _C.CLEANING: (2, 5),
    _C.CATERING: (2, 4),
    _C.SETUP: (3, 6),
    _C.STAGE: (1, 2),
    _C.OTHER: (1, 2),
}

# Programmation : trois passages par jour de festival (pas montage/démontage).
ARTIST_NAMES = [
    "La Battante", "Orchestre Miroir", "Kntongo", "Louve",
    "Les Frères Vent", "Nuage Bleu", "Sœur Machine", "Comète",
]
ARTIST_SLOTS: list[tuple[dt.time, dt.time]] = [
    (dt.time(18, 0), dt.time(19, 0)),
    (dt.time(19, 30), dt.time(21, 0)),
    (dt.time(21, 30), dt.time(23, 0)),
]


@dataclass
class Summary:
    volunteers: int = 0
    accounts: int = 0
    positions: int = 0
    shifts: int = 0
    understaffed_shifts: int = 0
    assignments: int = 0
    artists: int = 0
    position_wishes: int = 0
    artist_wishes: int = 0
    companion_wishes: int = 0
    warnings: Counter = field(default_factory=Counter)
    blocking: int = 0

    def __str__(self) -> str:
        lines = [
            "Jeu de démonstration « Festival des Lucioles » 2026",
            f"  Bénévoles              : {self.volunteers}",
            f"  Comptes (connexion)   : {self.accounts}",
            f"  Postes                : {self.positions}",
            f"  Créneaux              : {self.shifts}",
            f"  Créneaux sous l'effectif minimal (trous) : {self.understaffed_shifts}",
            f"  Affectations           : {self.assignments}",
            f"  Artistes programmés    : {self.artists}",
            f"  Vœux de poste déclarés : {self.position_wishes}",
            f"  Vœux d'artiste déclarés : {self.artist_wishes}",
            f"  Vœux de compagnon déclarés : {self.companion_wishes}",
            f"  Avertissements actifs : {sum(self.warnings.values())}",
        ]
        for code, count in sorted(self.warnings.items()):
            lines.append(f"      {code} : {count}")
        lines.append(f"  Violations bloquantes : {self.blocking}")
        lines.append("")
        lines.append(
            "  Connexion coordination (mot de passe) : "
            "coordination@lucioles.test / " + DEMO_COORDINATION_PASSWORD
        )
        lines.append(
            "  Référents et bénévoles : lien magique "
            "(referent0..2@lucioles.test, <prénom>.<nom><n>@example.test)"
        )
        return "\n".join(lines)


def _slug(value: str) -> str:
    return normalize(value).replace(" ", "").replace("-", "")


def _overlap(a: Shift, b: Shift) -> bool:
    return a.starts_at < b.ends_at and b.starts_at < a.ends_at


def _wipe(session: Session) -> None:
    for edition in session.exec(select(Edition).where(Edition.name == DEMO_EDITION_NAME)):
        session.delete(edition)
    session.flush()


def build(session: Session, *, rng: random.Random | None = None) -> Summary:
    rng = rng or random.Random(SEED)
    _wipe(session)

    edition = Edition(
        year=DEMO_YEAR,
        name=DEMO_EDITION_NAME,
        start_date=START,
        end_date=END,
        retention_days=365,
    )
    session.add(edition)
    session.flush()

    day_parts = [
        DayPart(
            edition_id=edition.id,
            code=code,
            label=label,
            start_time=start,
            end_time=end,
            order=order,
        )
        for order, (code, label, start, end) in enumerate(
            [
                ("MORNING", "Matin", dt.time(6, 0), dt.time(13, 0)),
                ("AFTERNOON", "Après-midi", dt.time(13, 0), dt.time(19, 0)),
                ("EVENING", "Soirée", dt.time(19, 0), dt.time(6, 0)),
            ]
        )
    ]
    session.add_all(day_parts)
    session.flush()
    dp_windows = tuple(
        DayPartWindow(dp.code, dp.start_time, dp.end_time, dp.order) for dp in day_parts
    )

    coordination = Account(
        edition_id=edition.id,
        email="coordination@lucioles.test",
        role=Role.COORDINATOR,
        password_hash=hash_password(DEMO_COORDINATION_PASSWORD),
    )
    leads = [
        Account(
            edition_id=edition.id,
            email=f"referent{i}@lucioles.test",
            role=Role.LEAD,
        )
        for i in range(3)
    ]
    session.add_all([coordination, *leads])
    session.flush()

    positions: list[Position] = []
    for index, (name, category, location, _required) in enumerate(POSITIONS):
        position = Position(
            edition_id=edition.id,
            name=name,
            category=category,
            location=location,
        )
        if index in (12, 13, 14):
            position.lead_account_id = leads[index - 12].id
        session.add(position)
        session.flush()
        positions.append(position)

    dates = [START + dt.timedelta(days=k) for k in range(4)]
    phase_of = {
        dates[0]: "montage",
        dates[1]: "festival",
        dates[2]: "festival",
        dates[3]: "demontage",
    }

    artists: list[Artist] = []
    for day in dates:
        if phase_of[day] != "festival":
            continue
        for start, end in ARTIST_SLOTS:
            artist = Artist(
                edition_id=edition.id,
                name=ARTIST_NAMES[len(artists) % len(ARTIST_NAMES)],
                performance_date=day,
                start_time=start,
                end_time=end,
            )
            session.add(artist)
            artists.append(artist)
    session.flush()

    volunteers: list[Volunteer] = []
    used_names: set[tuple[str, str]] = set()
    n_position_wishes = 0
    n_artist_wishes = 0
    for i in range(120):
        while True:
            first = rng.choice(FIRST_NAMES)
            last = rng.choice(LAST_NAMES)
            if (first, last) not in used_names:
                used_names.add((first, last))
                break
        email = f"{_slug(first)}.{_slug(last)}{i}@example.test" if rng.random() < 0.85 else None
        volunteer = Volunteer(
            edition_id=edition.id,
            first_name=first,
            last_name=last,
            email=email,
            phone=(f"06{rng.randint(10_000_000, 99_999_999)}" if rng.random() < 0.8 else None),
        )
        session.add(volunteer)
        session.flush()
        volunteers.append(volunteer)
        if email is not None:
            session.add(
                Account(
                    edition_id=edition.id,
                    email=email,
                    role=Role.VOLUNTEER,
                    volunteer_id=volunteer.id,
                )
            )
        # Vœux : poste qu'il voudrait tenir, artistes qu'il veut voir.
        if rng.random() < 0.4:
            session.add(
                VolunteerPositionWish(
                    volunteer_id=volunteer.id,
                    position_id=rng.choice(positions).id,
                )
            )
            n_position_wishes += 1
        for artist in artists:
            if rng.random() < 0.15:
                session.add(
                    VolunteerArtist(volunteer_id=volunteer.id, artist_id=artist.id)
                )
                n_artist_wishes += 1
    # Vœux de compagnon (couple, amis) : à sens unique, choisis parmi les
    # autres bénévoles déjà créés.
    n_companion_wishes = 0
    for volunteer in volunteers:
        others = [v for v in volunteers if v.id != volunteer.id]
        roll = rng.random()
        n_wishes = 2 if roll < 0.03 else (1 if roll < 0.23 else 0)
        for companion in rng.sample(others, k=min(n_wishes, len(others))):
            session.add(
                VolunteerCompanionWish(
                    volunteer_id=volunteer.id, companion_id=companion.id
                )
            )
            n_companion_wishes += 1
    # Disponibilités : chaque bénévole déclare, pour ~80 % des jours, une
    # large fenêtre couvrant la journée et la nuit (06:00 → 04:00 le lendemain).
    _FULL_DAY = (dt.time(6, 0), dt.time(4, 0))
    availabilities: dict[object, list[AvailabilityWindow]] = {}
    for volunteer in volunteers:
        windows: list[AvailabilityWindow] = []
        for day in dates:
            if rng.random() < 0.8:
                start, end = _FULL_DAY
                session.add(
                    Availability(
                        edition_id=edition.id,
                        volunteer_id=volunteer.id,
                        date=day,
                        start_time=start,
                        end_time=end,
                    )
                )
                windows.append(AvailabilityWindow(day, start, end))
        availabilities[volunteer.id] = windows

    shifts: list[Shift] = []
    for position, (_n, category, _l, _r) in zip(positions, POSITIONS, strict=True):
        for day in dates:
            for start_hour, end_hour in _WINDOWS[category][phase_of[day]]:
                min_staff, ideal_staff = _STAFF[category]
                min_staff = max(1, min_staff + rng.choice([-1, 0, 0, 1]))
                ideal_staff = max(min_staff + 1, ideal_staff + rng.choice([-1, 0, 1]))
                shift = Shift(
                    edition_id=edition.id,
                    position_id=position.id,
                    starts_at=dt.datetime.combine(day, dt.time(start_hour, 0)),
                    ends_at=dt.datetime.combine(day, dt.time(0, 0)) + dt.timedelta(hours=end_hour),
                    min_staff=min_staff,
                    ideal_staff=ideal_staff,
                )
                session.add(shift)
                session.flush()
                shifts.append(shift)

    assigned: dict[object, list[Shift]] = {v.id: [] for v in volunteers}

    # Trois bénévoles réservés aux scénarios d'avertissement : exclus de
    # l'affectation générale pour rester libres.
    reserved = volunteers[:3]
    reserved_ids = {v.id for v in reserved}
    assignable = [v for v in volunteers if v.id not in reserved_ids]

    def _clean(volunteer: Volunteer, shift: Shift) -> bool:
        data = ValidationInput(
            candidate_shift=ShiftInfo(
                id=str(shift.id),
                starts_at=shift.starts_at,
                ends_at=shift.ends_at,
            ),
            existing_shifts=tuple(
                ShiftInfo(id=str(s.id), starts_at=s.starts_at, ends_at=s.ends_at)
                for s in assigned[volunteer.id]
            ),
            availabilities=tuple(availabilities[volunteer.id]),
            day_parts=dp_windows,
        )
        return not validate(data)

    n_assignments = 0
    order = shifts[:]
    rng.shuffle(order)
    for index, shift in enumerate(order):
        if index % 16 == 0:  # ~6 créneaux : trou d'effectif volontaire
            target = max(0, shift.min_staff - 1)
        else:
            target = rng.randint(shift.min_staff, shift.ideal_staff)
        pool = assignable[:]
        rng.shuffle(pool)
        placed = 0
        for volunteer in pool:
            if placed >= target:
                break
            if any(_overlap(shift, s) for s in assigned[volunteer.id]):
                continue
            if not _clean(volunteer, shift):
                continue
            session.add(
                Assignment(
                    edition_id=edition.id,
                    volunteer_id=volunteer.id,
                    shift_id=shift.id,
                    source=AssignmentSource.MANUAL,
                )
            )
            assigned[volunteer.id].append(shift)
            placed += 1
            n_assignments += 1

    n_assignments += _add_demo_warnings(
        session, edition, shifts, reserved, assigned, availabilities
    )
    session.flush()

    fill: Counter = Counter()
    for volunteer_shifts in assigned.values():
        for shift in volunteer_shifts:
            fill[shift.id] += 1

    session.flush()
    account_count = len(
        session.exec(
            select(Account).where(Account.edition_id == edition.id)
        ).all()
    )

    summary = Summary(
        volunteers=len(volunteers),
        accounts=account_count,
        positions=len(positions),
        shifts=len(shifts),
        assignments=n_assignments,
        understaffed_shifts=sum(1 for shift in shifts if fill[shift.id] < shift.min_staff),
        artists=len(artists),
        position_wishes=n_position_wishes,
        artist_wishes=n_artist_wishes,
        companion_wishes=n_companion_wishes,
    )
    _verify(session, edition, summary)
    return summary


def _clear_day(session, volunteer, day, availabilities) -> None:
    session.execute(
        delete(Availability)
        .where(Availability.volunteer_id == volunteer.id)
        .where(Availability.date == day)
    )
    availabilities[volunteer.id] = [
        w for w in availabilities[volunteer.id] if w.date != day
    ]


def _declare_window(
    session, edition, volunteer, day, start, end, availabilities
) -> None:
    session.add(
        Availability(
            edition_id=edition.id,
            volunteer_id=volunteer.id,
            date=day,
            start_time=start,
            end_time=end,
        )
    )
    availabilities[volunteer.id].append(AvailabilityWindow(day, start, end))


def _add_demo_warnings(
    session, edition, shifts, reserved, assigned, availabilities
) -> int:
    """Quelques affectations qui déclenchent des avertissements (et rien
    d'autre) : hors disponibilité, repos insuffisant. `reserved` = trois
    bénévoles tenus à l'écart de l'affectation générale.
    """
    a, b, tired = reserved
    added = 0

    # OUTSIDE_AVAILABILITY : deux bénévoles affectés un jour où ils n'ont
    # déclaré aucune disponibilité.
    plain = sorted(shifts, key=lambda s: s.starts_at)
    for volunteer, shift in ((a, plain[3]), (b, plain[7])):
        _clear_day(session, volunteer, shift.starts_at.date(), availabilities)
        _add_active(session, edition, volunteer, shift, assigned)
        added += 1

    # INSUFFICIENT_REST : deux créneaux espacés de moins de 8 h, sur deux
    # journées (pour ne pas déclencher le cumul), tous deux couverts par une
    # disponibilité.
    pair = _find_rest_pair(shifts)
    if pair is not None:
        first, second = pair
        for shift in (first, second):
            _clear_day(session, tired, shift.starts_at.date(), availabilities)
            _declare_window(
                session,
                edition,
                tired,
                shift.starts_at.date(),
                dt.time(6, 0),
                dt.time(4, 0),
                availabilities,
            )
        _add_active(session, edition, tired, first, assigned)
        _add_active(session, edition, tired, second, assigned)
        added += 2

    return added


def _find_rest_pair(shifts: list[Shift]) -> tuple[Shift, Shift] | None:
    plain = sorted(shifts, key=lambda s: s.starts_at)
    for i, first in enumerate(plain):
        for second in plain[i + 1 :]:
            gap = second.starts_at - first.ends_at
            if (
                first.ends_at <= second.starts_at
                and dt.timedelta(0) < gap < dt.timedelta(hours=8)
                and first.starts_at.date() != second.starts_at.date()
            ):
                return first, second
    return None


def _add_active(session, edition, volunteer, shift, assigned) -> None:
    session.add(
        Assignment(
            edition_id=edition.id,
            volunteer_id=volunteer.id,
            shift_id=shift.id,
            source=AssignmentSource.MANUAL,
        )
    )
    assigned[volunteer.id].append(shift)


def _verify(session: Session, edition: Edition, summary: Summary) -> None:
    session.flush()
    assignments = session.exec(
        select(Assignment).where(Assignment.edition_id == edition.id)
    )
    for assignment in assignments:
        volunteer = session.get(Volunteer, assignment.volunteer_id)
        shift = session.get(Shift, assignment.shift_id)
        for violation in validate(
            build_validation_input(
                session=session,
                edition=edition,
                volunteer=volunteer,
                shift=shift,
                exclude_assignment_id=assignment.id,
            )
        ):
            if violation.severity is Severity.BLOCKING:
                summary.blocking += 1
            else:
                summary.warnings[violation.code] += 1


def main() -> None:
    with Session(engine) as session:
        summary = build(session)
        session.commit()
    print(summary)


if __name__ == "__main__":
    main()