"""Tables SQLModel du domaine.

Vocabulaire : voir CLAUDE.md § 1. Toute entité métier porte un `edition_id`
(multi-édition dans une seule base). Les suppressions en cascade sont assurées
au niveau base (`ondelete="CASCADE"`) ; les relations ORM utilisent
`passive_deletes=True` pour laisser la base faire le travail.
"""

import datetime as dt
import uuid

from sqlalchemy import Boolean, Column, Integer
from sqlalchemy import Enum as SAEnum
from sqlmodel import Field, Relationship, SQLModel, UniqueConstraint

from app.models.base import TimestampMixin
from app.models.enums import (
    AssignmentSource,
    AvailabilityStatus,
    PositionCategory,
    Role,
)

_PASSIVE = {"passive_deletes": True}


# --------------------------------------------------------------------------- #
# Tables d'association (sans champs d'audit)                                   #
# --------------------------------------------------------------------------- #
class VolunteerSkill(SQLModel, table=True):
    __tablename__ = "volunteer_skill"

    volunteer_id: uuid.UUID = Field(
        foreign_key="volunteer.id", primary_key=True, ondelete="CASCADE"
    )
    skill_id: uuid.UUID = Field(
        foreign_key="skill.id", primary_key=True, ondelete="CASCADE"
    )


class ShiftRequiredSkill(SQLModel, table=True):
    __tablename__ = "shift_required_skill"

    shift_id: uuid.UUID = Field(
        foreign_key="shift.id", primary_key=True, ondelete="CASCADE"
    )
    skill_id: uuid.UUID = Field(
        foreign_key="skill.id", primary_key=True, ondelete="CASCADE"
    )


class VolunteerArtist(SQLModel, table=True):
    """Vœu d'un bénévole : « je veux voir cet artiste »."""

    __tablename__ = "volunteer_artist"

    volunteer_id: uuid.UUID = Field(
        foreign_key="volunteer.id", primary_key=True, ondelete="CASCADE"
    )
    artist_id: uuid.UUID = Field(
        foreign_key="artist.id", primary_key=True, ondelete="CASCADE"
    )


class VolunteerPositionWish(SQLModel, table=True):
    """Vœu d'un bénévole : « je voudrais tenir ce poste »."""

    __tablename__ = "volunteer_position_wish"

    volunteer_id: uuid.UUID = Field(
        foreign_key="volunteer.id", primary_key=True, ondelete="CASCADE"
    )
    position_id: uuid.UUID = Field(
        foreign_key="position.id", primary_key=True, ondelete="CASCADE"
    )


# --------------------------------------------------------------------------- #
# Édition et découpage des journées                                           #
# --------------------------------------------------------------------------- #
class Edition(TimestampMixin, table=True):
    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    year: int = Field(index=True)
    name: str | None = None
    start_date: dt.date
    end_date: dt.date
    # Durée de rétention des données nominatives, en jours. None = pas de purge.
    retention_days: int | None = None

    day_parts: list["DayPart"] = Relationship(
        back_populates="edition", sa_relationship_kwargs=_PASSIVE
    )


class DayPart(TimestampMixin, table=True):
    __tablename__ = "day_part"
    __table_args__ = (
        UniqueConstraint("edition_id", "code", name="uq_day_part_edition_code"),
    )

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    code: str
    label: str
    start_time: dt.time
    # end_time < start_time signifie que la demi-journée passe minuit
    # (ex. soirée 19:00 -> 06:00).
    end_time: dt.time
    order: int = Field(
        default=0,
        sa_column=Column(Integer, nullable=False, server_default="0"),
    )

    edition: Edition = Relationship(back_populates="day_parts")
    availabilities: list["Availability"] = Relationship(
        back_populates="day_part", sa_relationship_kwargs=_PASSIVE
    )


# --------------------------------------------------------------------------- #
# Personnes : bénévoles, compétences, comptes                                 #
# --------------------------------------------------------------------------- #
class Skill(TimestampMixin, table=True):
    __table_args__ = (
        UniqueConstraint("edition_id", "code", name="uq_skill_edition_code"),
    )

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    code: str
    label: str

    volunteers: list["Volunteer"] = Relationship(
        back_populates="skills",
        link_model=VolunteerSkill,
        sa_relationship_kwargs=_PASSIVE,
    )
    shifts_requiring: list["Shift"] = Relationship(
        back_populates="required_skills",
        link_model=ShiftRequiredSkill,
        sa_relationship_kwargs=_PASSIVE,
    )


class Artist(TimestampMixin, table=True):
    """Artiste programmé sur l'édition.

    La coordination constitue la liste (présentée par jour de passage). Les
    bénévoles y choisissent les artistes qu'ils veulent voir (`VolunteerArtist`).
    """

    __table_args__ = (
        UniqueConstraint(
            "edition_id", "name", "performance_date",
            name="uq_artist_edition_name_date",
        ),
    )

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    name: str
    # Jour de passage, dans les dates de l'édition.
    performance_date: dt.date = Field(index=True)

    fans: list["Volunteer"] = Relationship(
        back_populates="wished_artists",
        link_model=VolunteerArtist,
        sa_relationship_kwargs=_PASSIVE,
    )


class Volunteer(TimestampMixin, table=True):
    __table_args__ = (
        UniqueConstraint(
            "edition_id", "email", name="uq_volunteer_edition_email"
        ),
    )

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    # Identifiant fonctionnel unique par édition. Nullable : bénévole créé à la
    # main par la coordination, sans email.
    email: str | None = Field(default=None, index=True)
    first_name: str
    last_name: str
    phone: str | None = None
    comment: str | None = None

    skills: list[Skill] = Relationship(
        back_populates="volunteers",
        link_model=VolunteerSkill,
        sa_relationship_kwargs=_PASSIVE,
    )
    wished_artists: list[Artist] = Relationship(
        back_populates="fans",
        link_model=VolunteerArtist,
        sa_relationship_kwargs=_PASSIVE,
    )
    wished_positions: list["Position"] = Relationship(
        back_populates="wishing_volunteers",
        link_model=VolunteerPositionWish,
        sa_relationship_kwargs=_PASSIVE,
    )
    availabilities: list["Availability"] = Relationship(
        back_populates="volunteer", sa_relationship_kwargs=_PASSIVE
    )
    assignments: list["Assignment"] = Relationship(
        back_populates="volunteer", sa_relationship_kwargs=_PASSIVE
    )


class Account(TimestampMixin, table=True):
    __table_args__ = (
        UniqueConstraint("edition_id", "email", name="uq_account_edition_email"),
        UniqueConstraint("volunteer_id", name="uq_account_volunteer"),
    )

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    email: str = Field(index=True)
    role: Role = Field(
        sa_column=Column(SAEnum(Role, native_enum=False), nullable=False)
    )
    # Défini ⇒ connexion par mot de passe (admins). None ⇒ connexion par lien
    # magique (référents, bénévoles).
    password_hash: str | None = None
    # Lien optionnel vers le bénévole. Supprimé avec lui (droit à l'effacement).
    volunteer_id: uuid.UUID | None = Field(
        default=None,
        foreign_key="volunteer.id",
        ondelete="CASCADE",
        nullable=True,
    )

    @property
    def auth_method(self) -> str:
        return "password" if self.password_hash else "magic_link"


class MagicLinkToken(TimestampMixin, table=True):
    __tablename__ = "magic_link_token"

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    account_id: uuid.UUID = Field(
        foreign_key="account.id", index=True, ondelete="CASCADE"
    )
    token_hash: str = Field(unique=True, index=True)
    expires_at: dt.datetime
    used_at: dt.datetime | None = None


# --------------------------------------------------------------------------- #
# Planning : postes, créneaux, disponibilités, affectations                   #
# --------------------------------------------------------------------------- #
class Position(TimestampMixin, table=True):
    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    name: str
    location: str | None = None
    category: PositionCategory = Field(
        sa_column=Column(
            SAEnum(PositionCategory, native_enum=False), nullable=False
        )
    )
    lead_account_id: uuid.UUID | None = Field(
        default=None,
        foreign_key="account.id",
        ondelete="SET NULL",
        nullable=True,
    )

    shifts: list["Shift"] = Relationship(
        back_populates="position", sa_relationship_kwargs=_PASSIVE
    )
    wishing_volunteers: list["Volunteer"] = Relationship(
        back_populates="wished_positions",
        link_model=VolunteerPositionWish,
        sa_relationship_kwargs=_PASSIVE,
    )


class Shift(TimestampMixin, table=True):
    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    position_id: uuid.UUID = Field(
        foreign_key="position.id", index=True, ondelete="CASCADE"
    )
    starts_at: dt.datetime
    # Peut être le lendemain de starts_at (créneau à cheval sur minuit).
    ends_at: dt.datetime
    # Créneau type dont ce créneau est issu (génération à la création d'un
    # poste). NULL = créneau ad hoc. SET NULL si le type est supprimé.
    day_part_id: uuid.UUID | None = Field(
        default=None,
        foreign_key="day_part.id",
        ondelete="SET NULL",
        nullable=True,
        index=True,
    )
    min_staff: int = Field(
        default=0, sa_column=Column(Integer, nullable=False, server_default="0")
    )
    ideal_staff: int = Field(
        default=0, sa_column=Column(Integer, nullable=False, server_default="0")
    )

    position: Position = Relationship(back_populates="shifts")
    required_skills: list[Skill] = Relationship(
        back_populates="shifts_requiring",
        link_model=ShiftRequiredSkill,
        sa_relationship_kwargs=_PASSIVE,
    )
    assignments: list["Assignment"] = Relationship(
        back_populates="shift", sa_relationship_kwargs=_PASSIVE
    )


class Availability(TimestampMixin, table=True):
    """Déclaration du bénévole : « je peux venir tel jour, telle demi-journée ».

    À ne pas confondre avec Assignment (décision de l'organisation).
    """

    __table_args__ = (
        UniqueConstraint(
            "volunteer_id", "date", "day_part_id", name="uq_availability_slot"
        ),
    )

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    volunteer_id: uuid.UUID = Field(
        foreign_key="volunteer.id", index=True, ondelete="CASCADE"
    )
    date: dt.date
    day_part_id: uuid.UUID = Field(
        foreign_key="day_part.id", index=True, ondelete="CASCADE"
    )
    status: AvailabilityStatus = Field(
        sa_column=Column(
            SAEnum(AvailabilityStatus, native_enum=False), nullable=False
        )
    )

    volunteer: Volunteer = Relationship(back_populates="availabilities")
    day_part: DayPart = Relationship(back_populates="availabilities")


class Assignment(TimestampMixin, table=True):
    """Décision de l'organisation : « tu tiens tel créneau ».

    Existe ⇒ le bénévole est affecté (pas d'étape de confirmation). Retirer une
    affectation, c'est supprimer la ligne. À ne pas confondre avec Availability
    (déclaration du bénévole).
    """

    __table_args__ = (
        UniqueConstraint(
            "volunteer_id", "shift_id", name="uq_assignment_volunteer_shift"
        ),
    )

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    edition_id: uuid.UUID = Field(
        foreign_key="edition.id", index=True, ondelete="CASCADE"
    )
    volunteer_id: uuid.UUID = Field(
        foreign_key="volunteer.id", index=True, ondelete="CASCADE"
    )
    shift_id: uuid.UUID = Field(
        foreign_key="shift.id", index=True, ondelete="CASCADE"
    )
    source: AssignmentSource = Field(
        default=AssignmentSource.MANUAL,
        sa_column=Column(
            SAEnum(AssignmentSource, native_enum=False),
            nullable=False,
            server_default=AssignmentSource.MANUAL.value,
        ),
    )
    locked: bool = Field(
        default=False,
        sa_column=Column(Boolean, nullable=False, server_default="false"),
    )

    volunteer: Volunteer = Relationship(back_populates="assignments")
    shift: Shift = Relationship(back_populates="assignments")