"""
app/models/inspection_schedule.py
---------------------------------
Recurring inspection schedules (phase34).

An InspectionSchedule declares that a given template should be inspected at a
given facility (optionally scoped to one area) by a given inspector on a fixed
cadence. A token-protected cron endpoint (`/inspection-schedules/run`) walks
all active, due schedules and *materialises* a real `Inspection` row in
`in_progress` status — exactly as if the inspector had clicked "Start
Inspection" — then notifies the assigned inspector. The inspector opens it from
their queue and fills it out through the normal execute flow.

This is purely additive: no existing inspection behaviour changes. A schedule is
just an automated `inspections.start()`.
"""

from app import db
from app.utils.time_utils import now_eastern


class InspectionSchedule(db.Model):
    __tablename__ = 'inspection_schedules'

    id           = db.Column(db.Integer, primary_key=True)
    name         = db.Column(db.String(255), nullable=False)

    template_id  = db.Column(
        db.Integer, db.ForeignKey('inspection_templates.id', ondelete='CASCADE'),
        nullable=False
    )
    facility_id  = db.Column(
        db.Integer, db.ForeignKey('facilities.id', ondelete='CASCADE'),
        nullable=False
    )
    area_id      = db.Column(
        db.Integer, db.ForeignKey('areas.id', ondelete='SET NULL'),
        nullable=True
    )
    inspector_id = db.Column(
        db.Integer, db.ForeignKey('users.id', ondelete='CASCADE'),
        nullable=False
    )

    # daily | weekly | monthly | quarterly — mirrors InspectionTemplate.frequency
    frequency    = db.Column(
        db.Enum('daily', 'weekly', 'monthly', 'quarterly'),
        nullable=False, default='weekly'
    )
    active       = db.Column(db.Boolean, nullable=False, default=True)

    created_by   = db.Column(
        db.Integer, db.ForeignKey('users.id', ondelete='SET NULL'),
        nullable=True
    )
    created_at   = db.Column(db.DateTime, nullable=False, default=now_eastern)
    last_run_at  = db.Column(db.DateTime, nullable=True)   # last successful materialisation
    next_run_at  = db.Column(db.DateTime, nullable=True)   # when the next inspection is due

    # Relationships — explicit foreign_keys because two columns point at users.id.
    template  = db.relationship('InspectionTemplate', foreign_keys=[template_id])
    facility  = db.relationship('Facility',           foreign_keys=[facility_id])
    area      = db.relationship('Area',               foreign_keys=[area_id])
    inspector = db.relationship('User',               foreign_keys=[inspector_id])
    creator   = db.relationship('User',               foreign_keys=[created_by])

    def __repr__(self):
        return f'<InspectionSchedule {self.id} {self.name!r} {self.frequency}>'