"""
app/routes/facility_qr.py
-------------------------
Public facility QR scan page (phase38).

`GET /f/<token>` — public, tokenized, NO login (same authorization model as
vendor work orders, rule 89: the unguessable token IS the credential). Shows a
read-only, counts-and-scores-only snapshot of one facility:

  * summary stats (90 days): completed inspections, average score,
    resolved issues, last inspection date
  * score trend: last-30-day average vs the prior 30 days (same math as the
    score-drop alert in sla.py)
  * recent completed inspections: date, template, score — NO inspector names
  * open issues: counts by severity + SLA at-risk / breached counts —
    NO descriptions, NO photos

Hybrid access: if the scanner is logged in AND their role scope covers this
facility, a button links to the full internal facility view.

In multi-tenant mode the printed URL is built from the tenant's own domain
(request.host_url), so the route resolves by Host — NOT tenant-exempt.
"""

import logging
from datetime import timedelta

from flask import Blueprint, render_template, redirect, request, url_for, abort
from flask_login import current_user
from sqlalchemy import func, or_

from app import db, limiter
from app.models.facility import Facility, Area
from app.models.inspection import Inspection
from app.models.issue import Issue
from app.utils.sla import sla_status
from app.utils.scope import get_customer_scope, get_inspector_scope
from app.utils.time_utils import now_eastern

logger = logging.getLogger(__name__)

bp = Blueprint('facility_qr', __name__, url_prefix='/f')

SEVERITY_ORDER = ('critical', 'high', 'medium', 'low')


def _can_view_full(facility):
    """True when the logged-in scanner's role scope covers this facility."""
    if not current_user.is_authenticated:
        return False
    if current_user.role in ('admin', 'director', 'project_manager'):
        return True
    if current_user.role == 'inspector':
        return facility.id in (get_inspector_scope(current_user) or [])
    if current_user.role == 'customer':
        return facility.id in (get_customer_scope(current_user) or [])
    return False


@bp.route('/<token>')
@limiter.limit('60 per hour')
def scan(token):
    facility = Facility.query.filter_by(qr_token=token).first()
    if facility is None or not facility.active:
        abort(404)

    now = now_eastern()
    d30 = now - timedelta(days=30)
    d60 = now - timedelta(days=60)
    d90 = now - timedelta(days=90)

    completed = Inspection.query.filter(
        Inspection.facility_id == facility.id,
        Inspection.status == 'completed',
    )

    # ── Summary stats (90 days) ───────────────────────────────────────────
    total_90 = completed.filter(Inspection.inspection_date >= d90).count()
    avg_90 = db.session.query(func.avg(Inspection.overall_score)).filter(
        Inspection.facility_id == facility.id,
        Inspection.status == 'completed',
        Inspection.inspection_date >= d90,
        Inspection.overall_score.isnot(None),
    ).scalar()

    recent = (completed
              .order_by(Inspection.inspection_date.desc())
              .limit(8).all())
    last_date = recent[0].inspection_date if recent else None

    # ── Score trend: last 30 days vs prior 30 (mirrors send_score_alerts) ─
    def _avg_between(start, end):
        return db.session.query(func.avg(Inspection.overall_score)).filter(
            Inspection.facility_id == facility.id,
            Inspection.status == 'completed',
            Inspection.overall_score.isnot(None),
            Inspection.inspection_date >= start,
            Inspection.inspection_date < end,
        ).scalar()

    avg_cur   = _avg_between(d30, now + timedelta(days=1))
    avg_prior = _avg_between(d60, d30)
    trend_delta = (float(avg_cur) - float(avg_prior)) \
        if (avg_cur is not None and avg_prior is not None) else None

    # ── Open issues: counts by severity + SLA state (counts only) ─────────
    issue_q = (Issue.query
               .outerjoin(Area, Issue.area_id == Area.id)
               .filter(or_(Issue.facility_id == facility.id,
                           Area.facility_id == facility.id)))

    open_issues = issue_q.filter(
        Issue.status.in_(('open', 'in_progress'))).all()
    severity_counts = {s: 0 for s in SEVERITY_ORDER}
    sla_at_risk = sla_breached = 0
    for issue in open_issues:
        if issue.severity in severity_counts:
            severity_counts[issue.severity] += 1
        state = sla_status(issue)
        if state == 'at_risk':
            sla_at_risk += 1
        elif state == 'breached':
            sla_breached += 1

    pending_verification = issue_q.filter(
        Issue.status == 'pending_verification').count()
    resolved_90 = issue_q.filter(
        Issue.status == 'resolved',
        Issue.resolved_at.isnot(None),
        Issue.resolved_at >= d90,
    ).count()

    logger.info('FACILITY QR SCAN | facility_id=%s | authenticated=%s',
                facility.id, current_user.is_authenticated)

    return render_template(
        'facility_qr/view.html',
        token                = token,
        facility             = facility,
        contract             = facility.project,
        total_90             = total_90,
        avg_90               = float(avg_90) if avg_90 is not None else None,
        last_date            = last_date,
        recent               = recent,
        trend_delta          = trend_delta,
        avg_cur              = float(avg_cur) if avg_cur is not None else None,
        avg_prior            = float(avg_prior) if avg_prior is not None else None,
        open_total           = len(open_issues),
        severity_counts     = severity_counts,
        severity_order       = SEVERITY_ORDER,
        sla_at_risk          = sla_at_risk,
        sla_breached         = sla_breached,
        pending_verification = pending_verification,
        resolved_90          = resolved_90,
        can_view_full        = _can_view_full(facility),
        generated_at         = now,
    )


@bp.route('/<token>/report', methods=['POST'])
@limiter.limit('5 per hour')
def report(token):
    """Public occupant issue report submitted from the QR scan page.

    No login required — the unguessable QR token is the sole authorization.
    A honeypot field silently rejects bot submissions. Creates an Issue with
    reported_by=None so staff know it came from a public form.
    """
    facility = Facility.query.filter_by(qr_token=token).first()
    if facility is None or not facility.active:
        abort(404)

    # Honeypot — bots fill this field, humans leave it blank
    if request.form.get('website', '').strip():
        logger.warning('FACILITY QR REPORT | honeypot triggered | facility_id=%s', facility.id)
        return redirect(url_for('facility_qr.scan', token=token) + '?reported=1')

    description = request.form.get('description', '').strip()
    severity    = request.form.get('severity', 'medium')

    if not description:
        return redirect(url_for('facility_qr.scan', token=token))
    if severity not in ('low', 'medium', 'high'):
        severity = 'medium'

    issue = Issue(
        facility_id = facility.id,
        severity    = severity,
        description = description,
        status      = 'open',
        reported_by = None,   # anonymous public submission
    )
    db.session.add(issue)
    db.session.commit()

    logger.info('FACILITY QR REPORT | facility_id=%s issue_id=%s severity=%s',
                facility.id, issue.id, severity)

    # Notify staff via the notification matrix (same event as Issues → Create)
    try:
        from app.utils.notifications import notify_by_matrix
        notify_by_matrix('issue_created', issue_id=issue.id, facility_id=facility.id)
    except Exception as exc:
        logger.error('FACILITY QR REPORT | notify_failed | err=%s', exc)

    return redirect(url_for('facility_qr.scan', token=token) + '?reported=1')