"""Notifications plugin models - adapted to existing database schema."""

from datetime import datetime, timezone
from zoneinfo import ZoneInfo
from shopdb.api import db


_DEFAULT_TZ = 'America/New_York'


def _site_zone():
    """Site-configured IANA zone (settings key site_timezone) for calendar day
    placement. Imported lazily to avoid a circular import at model load."""
    from shopdb.api import Setting
    row = Setting.query.filter_by(key='site_timezone').first()
    name = row.value if row and row.value else _DEFAULT_TZ
    try:
        return ZoneInfo(name)
    except Exception:
        return ZoneInfo(_DEFAULT_TZ)


def _site_date(dt):
    """The calendar day (YYYY-MM-DD) a stored UTC datetime falls on in the site
    zone. allDay events must key off the site-local day, not the UTC day, or a
    late-evening notification lands on the wrong date for western sites."""
    if not dt:
        return None
    return dt.replace(tzinfo=timezone.utc).astimezone(_site_zone()).date().isoformat()


def _utc_iso(dt):
    """Serialize a stored datetime as an explicit-UTC ISO string.

    starttime/endtime are stored NAIVE but always hold UTC wall-clock (the
    create/update parse normalizes to UTC). Emitting a bare naive isoformat let
    the browser read it as LOCAL time, shifting displays by the tz offset (a
    14:34 EDT notification showed 18:34). Tag it UTC so new Date() parses the
    real instant and renders in the viewer's zone.
    """
    if not dt:
        return None
    return dt.replace(tzinfo=timezone.utc).isoformat()


class NotificationType(db.Model):
    """
    Notification type classification.
    Matches existing notificationtypes table.
    """
    __tablename__ = 'notificationtypes'

    notificationtypeid = db.Column(db.Integer, primary_key=True)
    typename = db.Column(db.String(50), nullable=False)
    typedescription = db.Column(db.Text)
    typecolor = db.Column(db.String(20), default='#17a2b8')
    isactive = db.Column(db.Boolean, default=True)

    # Auto-expiry rule: when a notification of this type has no explicit end time,
    # how long it stays up on the shopfloor board.
    #   'none'      -> indefinite (never auto-expires)
    #   'duration'  -> starttime + expirydays days
    #   'dailytime' -> next expiryhour:expiryminute Eastern (daily reset)
    expirymode = db.Column(db.String(20), default='none')
    expirydays = db.Column(db.Integer, nullable=True)
    expiryhour = db.Column(db.SmallInteger, nullable=True)
    expiryminute = db.Column(db.SmallInteger, nullable=True, default=0)

    # Shopfloor display behavior (data-driven; replaces hardcoded per-type logic).
    #   splitperemployee  -> one card per listed employee SSO
    #   showemployeephoto -> resolve + show each employee's photo + name
    #   displaystyle      -> 'standard' (rows) | 'carousel' (rotating photo card)
    #                        | 'grid' (cycling row of tiles) | 'banner'
    splitperemployee = db.Column(db.Boolean, default=False)
    showemployeephoto = db.Column(db.Boolean, default=False)
    displaystyle = db.Column(db.String(20), default='standard')

    # Minutes a card stays on the shopfloor board AFTER its end time, shown as
    # RESOLVED. 0 (the default) means it leaves the board the moment it ends,
    # which is what a reader expects from an end time. A type whose cards are
    # worth acknowledging after the fact - an incident that just cleared - can
    # opt into a tail.
    gracewindowminutes = db.Column(db.Integer, nullable=False,
                                   server_default='0', default=0)

    def __repr__(self):
        return f"<NotificationType {self.typename}>"

    def to_dict(self):
        return {
            'notificationtypeid': self.notificationtypeid,
            'typename': self.typename,
            'typedescription': self.typedescription,
            'typecolor': self.typecolor,
            'isactive': self.isactive,
            'expirymode': self.expirymode or 'none',
            'expirydays': self.expirydays,
            'expiryhour': self.expiryhour,
            'expiryminute': self.expiryminute if self.expiryminute is not None else 0,
            'splitperemployee': bool(self.splitperemployee),
            'showemployeephoto': bool(self.showemployeephoto),
            'displaystyle': self.displaystyle or 'standard',
            'gracewindowminutes': int(self.gracewindowminutes or 0)
        }


class Notification(db.Model):
    """
    Notification/announcement model.
    Matches existing notifications table schema.
    """
    __tablename__ = 'notifications'

    notificationid = db.Column(db.Integer, primary_key=True)
    notificationtypeid = db.Column(
        db.Integer,
        db.ForeignKey('notificationtypes.notificationtypeid'),
        nullable=True
    )
    businessunitid = db.Column(db.Integer, nullable=True, index=True)
    appid = db.Column(db.Integer, nullable=True)
    notification = db.Column(db.Text, nullable=False, comment='The message content')
    starttime = db.Column(db.DateTime, nullable=True)
    endtime = db.Column(db.DateTime, nullable=True)
    ticketnumber = db.Column(db.String(50), nullable=True)
    link = db.Column(db.String(500), nullable=True)
    isactive = db.Column(db.Boolean, default=True)
    isshopfloor = db.Column(db.Boolean, default=False)
    # TEXT (not VARCHAR): recognition/recertification notifications comma-join
    # every employee's SSO/name into one field, which overflows 100 chars once
    # ~11 people are listed.
    employeesso = db.Column(db.Text, nullable=True)
    employeename = db.Column(db.Text, nullable=True)

    # Relationships
    notificationtype = db.relationship('NotificationType', backref='notifications')

    def __repr__(self):
        return f"<Notification {self.notificationid}>"

    @property
    def is_current(self):
        """Check if notification is currently active based on dates."""
        now = datetime.now(timezone.utc).replace(tzinfo=None)
        if not self.isactive:
            return False
        if self.starttime and now < self.starttime:
            return False
        if self.endtime and now > self.endtime:
            return False
        return True

    @property
    def title(self):
        """Get title - first line or first 100 chars of notification."""
        if not self.notification:
            return ''
        lines = self.notification.split('\n')
        return lines[0][:100] if lines else self.notification[:100]

    def to_dict(self):
        """Convert to dictionary with related data."""
        result = {
            'notificationid': self.notificationid,
            'notificationtypeid': self.notificationtypeid,
            'businessunitid': self.businessunitid,
            'appid': self.appid,
            'notification': self.notification,
            'title': self.title,
            'message': self.notification,
            'starttime': _utc_iso(self.starttime),
            'endtime': _utc_iso(self.endtime),
            'startdate': _utc_iso(self.starttime),
            'enddate': _utc_iso(self.endtime),
            'ticketnumber': self.ticketnumber,
            'link': self.link,
            'linkurl': self.link,
            'isactive': bool(self.isactive) if self.isactive is not None else True,
            'isshopfloor': bool(self.isshopfloor) if self.isshopfloor is not None else False,
            'employeesso': self.employeesso,
            'employeename': self.employeename,
            'iscurrent': self.is_current
        }

        # Add type info
        if self.notificationtype:
            result['typename'] = self.notificationtype.typename
            result['typecolor'] = self.notificationtype.typecolor

        return result

    def to_calendar_event(self):
        """Convert to FullCalendar event format."""
        # Color is data-driven: types store a hex typecolor. Only the legacy
        # Bootstrap color-name aliases still need translating; hex passes through.
        color_aliases = {
            'success': '#04b962',
            'warning': '#ff8800',
            'danger': '#f5365c',
            'info': '#14abef',
            'primary': '#7934f3',
            'secondary': '#94614f',
        }

        ntype = self.notificationtype
        raw_color = ntype.typecolor if ntype else '#14abef'
        color = color_aliases.get(raw_color, raw_color if raw_color.startswith('#') else '#14abef')
        show_photo = bool(ntype and getattr(ntype, 'showemployeephoto', False))

        # Employee-photo types prefix the card with the person's name/SSO. A
        # multi-person recognition/training lists many people, so summarize as
        # "First Person +N" to keep the calendar title short (the detail popup
        # still shows the full employeename).
        title = self.title
        if show_photo:
            employee_display = self.employeename or self.employeesso
            if employee_display:
                people = [p.strip() for p in employee_display.split(',') if p.strip()]
                if len(people) > 1:
                    employee_display = f"{people[0]} +{len(people) - 1}"
                title = f"{employee_display}: {title}"

        return {
            'id': self.notificationid,
            'title': title,
            'start': _site_date(self.starttime),
            'end': _site_date(self.endtime),
            'allDay': True,
            'backgroundColor': color,
            'borderColor': color,
            'extendedProps': {
                'notificationid': self.notificationid,
                'message': self.notification,
                'typename': ntype.typename if ntype else None,
                'typecolor': raw_color,
                'showemployeephoto': show_photo,
                'displaystyle': (ntype.displaystyle or 'standard') if ntype else 'standard',
                'linkurl': self.link,
                'ticketnumber': self.ticketnumber,
                'employeename': self.employeename,
                'employeesso': self.employeesso,
            }
        }