"""Reset the public demo account and its data.

Idempotent: wipes everything owned by the demo account (properties it
manages, their spaces/bookings/attachments, its notifications, templates,
audit logs, memberships), restores its credentials and recreates a fresh
demo property with sample spaces and bookings.

Enabled only when DEMO_EMAIL is set (see settings.demo_email). Scheduled
from entrypoint.sh; can also be run manually:

    python reset_demo.py
"""
import os
from datetime import datetime, timedelta

from app.core.config import settings
from app.core.security import get_password_hash
from app.core.slug import DEMO_SLUG
from app.db.session import Base, SessionLocal, engine
from app.models.attachment import Attachment
from app.models.booking import Booking
from app.models.booking_template import BookingTemplate
from app.models.audit_log import AuditLog
from app.models.google_calendar_token import GoogleCalendarToken
from app.models.notification import Notification
from app.models.organization_member import OrganizationMember
from app.models.property import Property
from app.models.property_access import PropertyAccess
from app.models.property_manager import PropertyManager
from app.models.property_settings import PropertySettings
from app.models.space import Space
from app.models.user import User

DEMO_FULL_NAME = "Cont Demo"
DEMO_PROPERTY_NAME = "Proprietate Demo"


def _wipe_demo_data(db, demo: User) -> None:
    """Delete everything created by/for the demo account."""
    # Properties the demo account manages (including any it created itself).
    prop_ids = [
        pm.property_id
        for pm in db.query(PropertyManager).filter(PropertyManager.user_id == demo.id)
    ]

    space_ids = []
    if prop_ids:
        space_ids = [
            s.id for s in db.query(Space.id).filter(Space.property_id.in_(prop_ids))
        ]

    # Bookings inside demo spaces + any booking the demo user made elsewhere
    # (e.g. on public properties of the real instance).
    booking_query = db.query(Booking)
    if space_ids:
        booking_query = booking_query.filter(
            (Booking.space_id.in_(space_ids)) | (Booking.user_id == demo.id)
        )
    else:
        booking_query = booking_query.filter(Booking.user_id == demo.id)
    booking_ids = [b.id for b in booking_query.with_entities(Booking.id)]

    # Attachments: remove uploaded files from disk, then rows.
    att_filter = Attachment.uploaded_by == demo.id
    if booking_ids:
        att_filter = att_filter | Attachment.booking_id.in_(booking_ids)
    attachments = db.query(Attachment).filter(att_filter).all()
    for att in attachments:
        try:
            if att.filepath and os.path.exists(att.filepath):
                os.remove(att.filepath)
        except OSError:
            pass
        db.delete(att)
    db.flush()

    # Notifications referencing demo bookings (any user) + all demo's own.
    if booking_ids:
        db.query(Notification).filter(Notification.booking_id.in_(booking_ids)).delete(
            synchronize_session=False
        )
    db.query(Notification).filter(Notification.user_id == demo.id).delete(
        synchronize_session=False
    )

    if booking_ids:
        db.query(Booking).filter(Booking.id.in_(booking_ids)).delete(
            synchronize_session=False
        )

    db.query(BookingTemplate).filter(BookingTemplate.user_id == demo.id).delete(
        synchronize_session=False
    )
    db.query(GoogleCalendarToken).filter(GoogleCalendarToken.user_id == demo.id).delete(
        synchronize_session=False
    )
    db.query(AuditLog).filter(AuditLog.user_id == demo.id).delete(
        synchronize_session=False
    )
    db.query(OrganizationMember).filter(OrganizationMember.user_id == demo.id).delete(
        synchronize_session=False
    )
    db.query(PropertyAccess).filter(PropertyAccess.user_id == demo.id).delete(
        synchronize_session=False
    )

    if space_ids:
        db.query(Space).filter(Space.id.in_(space_ids)).delete(synchronize_session=False)
    if prop_ids:
        db.query(PropertySettings).filter(
            PropertySettings.property_id.in_(prop_ids)
        ).delete(synchronize_session=False)
        db.query(PropertyAccess).filter(PropertyAccess.property_id.in_(prop_ids)).delete(
            synchronize_session=False
        )
        db.query(PropertyManager).filter(
            PropertyManager.property_id.in_(prop_ids)
        ).delete(synchronize_session=False)
        db.query(Property).filter(Property.id.in_(prop_ids)).delete(
            synchronize_session=False
        )


def _seed_demo_data(db, demo: User) -> None:
    """Create a fresh demo property with spaces and sample bookings."""
    prop = Property(
        name=DEMO_PROPERTY_NAME,
        description="Mediu de test — datele se resetează automat la fiecare 3 ore.",
        address="Str. Exemplu nr. 1",
        is_public=True,
        is_active=True,
        list_on_landing=True,
        slug=DEMO_SLUG,
    )
    db.add(prop)
    db.flush()

    db.add(PropertyManager(property_id=prop.id, user_id=demo.id))
    db.add(PropertySettings(property_id=prop.id, require_approval=True))

    sala = Space(
        name="Sala Conferințe",
        type="sala",
        capacity=12,
        description="Sală de conferințe cu videoproiector",
        is_active=True,
        property_id=prop.id,
    )
    birou = Space(
        name="Birou Flex",
        type="birou",
        capacity=4,
        description="Birou flexibil, 4 locuri",
        is_active=True,
        property_id=prop.id,
    )
    sala_mica = Space(
        name="Sala Meeting",
        type="sala",
        capacity=6,
        description="Sală mică pentru întâlniri rapide",
        is_active=True,
        property_id=prop.id,
    )
    db.add_all([sala, birou, sala_mica])
    db.flush()

    today = datetime.now().replace(hour=0, minute=0, second=0, microsecond=0)
    samples = [
        # (space, day offset, start hour, hours, title, status)
        (sala, 0, 10, 2, "Prezentare produs", "approved"),
        (birou, 0, 14, 3, "Sesiune de lucru echipă", "approved"),
        (sala_mica, 1, 9, 1, "Daily standup", "approved"),
        (sala, 1, 13, 2, "Interviu candidat", "pending"),
        (birou, 2, 10, 4, "Workshop planificare", "pending"),
    ]
    for space, day, hour, hours, title, status in samples:
        start = today + timedelta(days=day, hours=hour)
        db.add(
            Booking(
                user_id=demo.id,
                space_id=space.id,
                title=title,
                description="Rezervare de exemplu (demo)",
                start_datetime=start,
                end_datetime=start + timedelta(hours=hours),
                status=status,
                approved_by=demo.id if status == "approved" else None,
            )
        )


def reset_demo() -> None:
    if not settings.demo_email:
        print("DEMO_EMAIL is not set - demo account disabled, nothing to do.")
        return

    Base.metadata.create_all(bind=engine)

    db = SessionLocal()
    try:
        demo = db.query(User).filter(User.email == settings.demo_email).first()

        if demo:
            _wipe_demo_data(db, demo)
        else:
            demo = User(email=settings.demo_email, full_name=DEMO_FULL_NAME,
                        hashed_password="", role="manager")
            db.add(demo)

        # Force-restore credentials and profile every run.
        demo.full_name = DEMO_FULL_NAME
        demo.hashed_password = get_password_hash(settings.demo_password)
        demo.role = "manager"
        demo.organization = "Demo"
        demo.is_active = True
        db.flush()

        _seed_demo_data(db, demo)

        db.commit()
        print(f"Demo account reset: {settings.demo_email} / property '{DEMO_PROPERTY_NAME}'")
    except Exception:
        db.rollback()
        raise
    finally:
        db.close()


if __name__ == "__main__":
    reset_demo()