"""
app/routes/public.py
--------------------
Login-free, token-addressed facility pages reached by scanning a facility's
QR code. The QR encodes /f/<public_token> (an unguessable token, so the pages
cannot be enumerated by facility id).

Routes
------
GET  /f/<token>          Occupant-friendly facility summary (no login).
POST /f/<token>/report   Occupant "report a problem" → creates an open Issue.

Design notes
------------
- Occupant-friendly: shows a quality rating, last-inspected date, and open-issue
  COUNT only — never issue descriptions, inspector names, or internal scores.
- Inactive facilities 404 (a decommissioned QR reveals nothing).
- The report form is rate-limited and honeypot-guarded against bots, and reuses
  the normal issue-creation notification path so staff/customers are alerted.
"""

import logging
from datetime import timedelta

from flask import Blueprint, render_template, redirect, url_for, flash, request, abort
from sqlalchemy import func

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.forms import PublicIssueReportForm
from app.utils.time_utils import now_eastern
from app.utils.notifications import notify_by_matrix

logger = logging.getLogger(__name__)

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


#: Maximum number of photos an occupant may attach to a public report.
MAX_REPORT_PHOTOS = 5


def _save_report_photos(file_list):
    """Save up to MAX_REPORT_PHOTOS uploaded photos from a public report.

    Returns (photo_path, extra_paths) where photo_path is the primary evidence
    photo (or None) and extra_paths is a list of the remaining paths (or None).
    Splitting this way mirrors the Issue photo model: the first photo lives in
    `photo_path`, the rest in `mobile_photo_paths` so they all render together
    under "Photo Evidence" on the web (rule 44 — never `result_photos`).
    """
    from app.routes.inspections import _save_photo
    saved = []
    for f in (file_list or [])[:MAX_REPORT_PHOTOS]:
        path = _save_photo(f, subfolder='issue_photos')
        if path:
            saved.append(path)
    photo_path  = saved[0] if saved else None
    extra_paths = saved[1:] if len(saved) > 1 else None
    return photo_path, extra_paths


#: Window within which an identical public report is treated as a duplicate.
DUPLICATE_REPORT_WINDOW_SECONDS = 60


def _recent_duplicate_report(facility_id, area_id, description):
    """Return True if an identical public report was just filed.

    Belt-and-suspenders against duplicate submissions (double-taps, JS-disabled
    clients, retries): if a public issue (reported_by IS NULL) with the same
    facility/area and identical description was created within the last
    DUPLICATE_REPORT_WINDOW_SECONDS, treat this one as a duplicate and skip it.
    """
    cutoff = now_eastern() - timedelta(seconds=DUPLICATE_REPORT_WINDOW_SECONDS)
    q = Issue.query.filter(
        Issue.reported_by.is_(None),
        Issue.reported_at >= cutoff,
        Issue.description == description,
    )
    if area_id is not None:
        q = q.filter(Issue.area_id == area_id)
    else:
        q = q.filter(Issue.facility_id == facility_id, Issue.area_id.is_(None))
    return db.session.query(q.exists()).scalar()


def _facility_by_token_or_404(token: str) -> Facility:
    """Resolve an ACTIVE facility from its public token, else 404."""
    if not token:
        abort(404)
    facility = Facility.query.filter_by(public_token=token).first()
    if facility is None or not facility.active:
        abort(404)
    return facility


def _rating_label(score):
    """Map a 0–100 score to an occupant-friendly label + Bootstrap colour."""
    if score is None:
        return ('Not yet rated', 'secondary')
    if score >= 90:
        return ('Excellent', 'success')
    if score >= 80:
        return ('Good', 'success')
    if score >= 70:
        return ('Fair', 'warning')
    return ('Needs attention', 'danger')


def _build_summary(facility: Facility) -> dict:
    """Assemble the occupant-facing summary for a facility.

    Occupant-safe (rule 74): aggregate rating, counts, a score trend, and
    recent inspection DATES only — no checklist/template names, no
    per-inspection scores, no issue descriptions, and no severity/SLA detail.
    """
    fid = facility.id
    now = now_eastern()
    cutoff_90 = now - timedelta(days=90)
    cutoff_30 = now - timedelta(days=30)
    cutoff_60 = now - timedelta(days=60)

    # Most recent completed, scored inspection (for last-inspected date)
    last_insp = (
        Inspection.query
        .filter(Inspection.facility_id == fid,
                Inspection.status == 'completed',
                Inspection.overall_score.isnot(None))
        .order_by(Inspection.inspection_date.desc())
        .first()
    )

    def _avg_between(start, end=None):
        q = (db.session.query(func.avg(Inspection.overall_score))
             .filter(Inspection.facility_id == fid,
                     Inspection.status == 'completed',
                     Inspection.overall_score.isnot(None),
                     Inspection.inspection_date >= start))
        if end is not None:
            q = q.filter(Inspection.inspection_date < end)
        return q.scalar()

    # Average score over the last 90 days (fallback: all-time) for the rating
    avg_90 = _avg_between(cutoff_90)
    if avg_90 is None:
        avg_90 = (
            db.session.query(func.avg(Inspection.overall_score))
            .filter(Inspection.facility_id == fid,
                    Inspection.status == 'completed',
                    Inspection.overall_score.isnot(None))
            .scalar()
        )
    avg_score = round(float(avg_90), 1) if avg_90 is not None else None

    # Completed-inspection count over the last 90 days
    inspections_90 = (
        Inspection.query
        .filter(Inspection.facility_id == fid,
                Inspection.status == 'completed',
                Inspection.inspection_date >= cutoff_90)
        .count()
    )

    # Score trend: last 30 days vs the prior 30 days (aggregate only)
    avg_cur = _avg_between(cutoff_30)
    avg_prior = _avg_between(cutoff_60, cutoff_30)
    if avg_cur is not None and avg_prior is not None:
        trend_delta = round(float(avg_cur) - float(avg_prior), 1)
    else:
        trend_delta = None

    # Recent inspection DATES only (no checklist names, no scores)
    recent = (
        Inspection.query
        .filter(Inspection.facility_id == fid,
                Inspection.status == 'completed')
        .order_by(Inspection.inspection_date.desc())
        .limit(5)
        .all()
    )
    recent_dates = [i.inspection_date for i in recent]

    # Open-issue COUNT (linked directly or via an area) — no details exposed
    open_issue_count = (
        Issue.query
        .outerjoin(Area, Issue.area_id == Area.id)
        .filter(Issue.status.in_(['open', 'in_progress']),
                db.or_(Issue.facility_id == fid, Area.facility_id == fid))
        .count()
    )

    # Resolved-issue COUNT over the last 90 days — no details exposed
    resolved_90 = (
        Issue.query
        .outerjoin(Area, Issue.area_id == Area.id)
        .filter(Issue.status == 'resolved',
                Issue.resolved_at.isnot(None),
                Issue.resolved_at >= cutoff_90,
                db.or_(Issue.facility_id == fid, Area.facility_id == fid))
        .count()
    )

    label, colour = _rating_label(avg_score)

    return {
        'facility':         facility,
        'avg_score':        avg_score,
        'rating_label':     label,
        'rating_colour':    colour,
        'inspections_90':   inspections_90,
        'open_issue_count': open_issue_count,
        'resolved_90':      resolved_90,
        'trend_delta':      trend_delta,
        'last_inspected':   last_insp.inspection_date if last_insp else None,
        'recent_dates':     recent_dates,
    }


def _area_by_token_or_404(token):
    """Resolve an area (and its ACTIVE facility) from the area's public token."""
    if not token:
        abort(404)
    area = Area.query.filter_by(public_token=token).first()
    if area is None:
        abort(404)
    facility = db.session.get(Facility, area.facility_id)
    if facility is None or not facility.active:
        abort(404)
    return area, facility


def _build_area_summary(area, facility) -> dict:
    """Assemble the occupant-facing summary for a single area.

    Occupant-safe (rule 74): same aggregate-only shape as the facility page,
    but every metric is scoped to this area's inspections/issues.
    """
    aid = area.id
    now = now_eastern()
    cutoff_90 = now - timedelta(days=90)
    cutoff_30 = now - timedelta(days=30)
    cutoff_60 = now - timedelta(days=60)

    last_insp = (
        Inspection.query
        .filter(Inspection.area_id == aid,
                Inspection.status == 'completed',
                Inspection.overall_score.isnot(None))
        .order_by(Inspection.inspection_date.desc())
        .first()
    )

    def _avg_between(start, end=None):
        q = (db.session.query(func.avg(Inspection.overall_score))
             .filter(Inspection.area_id == aid,
                     Inspection.status == 'completed',
                     Inspection.overall_score.isnot(None),
                     Inspection.inspection_date >= start))
        if end is not None:
            q = q.filter(Inspection.inspection_date < end)
        return q.scalar()

    avg_90 = _avg_between(cutoff_90)
    if avg_90 is None:
        avg_90 = (
            db.session.query(func.avg(Inspection.overall_score))
            .filter(Inspection.area_id == aid,
                    Inspection.status == 'completed',
                    Inspection.overall_score.isnot(None))
            .scalar()
        )
    avg_score = round(float(avg_90), 1) if avg_90 is not None else None

    inspections_90 = (
        Inspection.query
        .filter(Inspection.area_id == aid,
                Inspection.status == 'completed',
                Inspection.inspection_date >= cutoff_90)
        .count()
    )

    avg_cur = _avg_between(cutoff_30)
    avg_prior = _avg_between(cutoff_60, cutoff_30)
    if avg_cur is not None and avg_prior is not None:
        trend_delta = round(float(avg_cur) - float(avg_prior), 1)
    else:
        trend_delta = None

    recent = (
        Inspection.query
        .filter(Inspection.area_id == aid,
                Inspection.status == 'completed')
        .order_by(Inspection.inspection_date.desc())
        .limit(5)
        .all()
    )
    recent_dates = [i.inspection_date for i in recent]

    open_issue_count = (
        Issue.query
        .filter(Issue.status.in_(['open', 'in_progress']),
                Issue.area_id == aid)
        .count()
    )

    resolved_90 = (
        Issue.query
        .filter(Issue.status == 'resolved',
                Issue.resolved_at.isnot(None),
                Issue.resolved_at >= cutoff_90,
                Issue.area_id == aid)
        .count()
    )

    label, colour = _rating_label(avg_score)

    return {
        'facility':         facility,
        'area':             area,
        'avg_score':        avg_score,
        'rating_label':     label,
        'rating_colour':    colour,
        'inspections_90':   inspections_90,
        'open_issue_count': open_issue_count,
        'resolved_90':      resolved_90,
        'trend_delta':      trend_delta,
        'last_inspected':   last_insp.inspection_date if last_insp else None,
        'recent_dates':     recent_dates,
    }


@bp.route('/<token>', methods=['GET'])
def facility_summary(token):
    facility = _facility_by_token_or_404(token)
    summary = _build_summary(facility)
    form = PublicIssueReportForm()
    return render_template('public/facility.html',
                           form=form, token=token, **summary)


@bp.route('/area/<token>', methods=['GET'])
def area_summary(token):
    area, facility = _area_by_token_or_404(token)
    summary = _build_area_summary(area, facility)
    form = PublicIssueReportForm()
    return render_template('public/area.html',
                           form=form, token=token, **summary)


@bp.route('/<token>/report', methods=['POST'])
@limiter.limit('5 per hour; 20 per day')
def report_problem(token):
    facility = _facility_by_token_or_404(token)
    form = PublicIssueReportForm()

    # Honeypot: silently accept-and-drop obvious bot submissions.
    if form.website.data:
        logger.info('PUBLIC REPORT | honeypot tripped | facility_id=%s | ip=%s',
                    facility.id, request.remote_addr)
        flash('Thank you — your report has been received.', 'success')
        return redirect(url_for('public.facility_summary', token=token))

    if not form.validate_on_submit():
        # Re-render the page with validation errors and the summary intact.
        summary = _build_summary(facility)
        return render_template('public/facility.html',
                               form=form, token=token, **summary), 400

    # Fold optional reporter identity + location into the description; the
    # public reporter is not a User, so reported_by stays NULL.
    parts = ['[Reported via facility QR code]']
    if form.area_label.data:
        parts.append(f'Location: {form.area_label.data.strip()}')
    reporter_bits = [b for b in (form.reporter_name.data, form.reporter_contact.data) if b]
    if reporter_bits:
        parts.append('Reporter: ' + ' — '.join(b.strip() for b in reporter_bits))
    parts.append('')
    parts.append(form.description.data.strip())
    description = '\n'.join(parts)

    # Server-side idempotency: silently accept an identical repeat as success
    # without creating a second issue (or saving its photos).
    if _recent_duplicate_report(facility.id, None, description):
        logger.info('PUBLIC REPORT | duplicate suppressed | facility_id=%s | ip=%s',
                    facility.id, request.remote_addr)
        flash('Thank you — your report has been received and the team has been notified.',
              'success')
        return redirect(url_for('public.facility_summary', token=token))

    # Save up to 5 optional photos through the shared, magic-byte-validated
    # saver. First → photo_path, the rest → mobile_photo_paths.
    photo_path, extra_photos = _save_report_photos(form.photos.data)

    issue = Issue(
        facility_id = facility.id,
        area_id     = None,
        severity    = 'medium',
        description = description,
        photo_path  = photo_path,
        mobile_photo_paths = extra_photos,
        status      = 'open',
        reported_at = now_eastern(),
        reported_by = None,
    )
    db.session.add(issue)
    db.session.commit()

    _photo_count = (1 if photo_path else 0) + (len(extra_photos) if extra_photos else 0)
    logger.info('PUBLIC REPORT | issue_id=%s | facility_id=%s | ip=%s | photos=%s',
                issue.id, facility.id, request.remote_addr, _photo_count)

    # Reuse the standard issue-created routing (staff + facility customers).
    notify_by_matrix(
        event_type  = 'issue_created',
        title       = f'New Issue #{issue.id} at {facility.name} (QR report)',
        body        = (
            f'A problem was reported at {facility.name} via the facility QR code. '
            f'Description: {form.description.data.strip()[:120]}'
            f'{"…" if len(form.description.data.strip()) > 120 else ""}'
        ),
        link        = url_for('issues.view', issue_id=issue.id),
        issue_id    = issue.id,
        facility_id = facility.id,
    )
    db.session.commit()

    flash('Thank you — your report has been received and the team has been notified.',
          'success')
    return redirect(url_for('public.facility_summary', token=token))


@bp.route('/area/<token>/report', methods=['POST'])
@limiter.limit('5 per hour; 20 per day')
def area_report_problem(token):
    area, facility = _area_by_token_or_404(token)
    form = PublicIssueReportForm()

    # Honeypot: silently accept-and-drop obvious bot submissions.
    if form.website.data:
        logger.info('PUBLIC REPORT | honeypot tripped | area_id=%s | ip=%s',
                    area.id, request.remote_addr)
        flash('Thank you — your report has been received.', 'success')
        return redirect(url_for('public.area_summary', token=token))

    if not form.validate_on_submit():
        summary = _build_area_summary(area, facility)
        return render_template('public/area.html',
                               form=form, token=token, **summary), 400

    # The area is known from the QR token, so we set area_id directly and note
    # the source. A public reporter is not a User, so reported_by stays NULL.
    parts = [f'[Reported via area QR code — {area.name}]']
    if form.area_label.data:
        parts.append(f'Location: {form.area_label.data.strip()}')
    reporter_bits = [b for b in (form.reporter_name.data, form.reporter_contact.data) if b]
    if reporter_bits:
        parts.append('Reporter: ' + ' — '.join(b.strip() for b in reporter_bits))
    parts.append('')
    parts.append(form.description.data.strip())
    description = '\n'.join(parts)

    # Server-side idempotency: silently accept an identical repeat as success
    # without creating a second issue (or saving its photos).
    if _recent_duplicate_report(facility.id, area.id, description):
        logger.info('PUBLIC REPORT | duplicate suppressed | area_id=%s | facility_id=%s | ip=%s',
                    area.id, facility.id, request.remote_addr)
        flash('Thank you — your report has been received and the team has been notified.',
              'success')
        return redirect(url_for('public.area_summary', token=token))

    # Save up to 5 optional photos (first → photo_path, rest → mobile_photo_paths).
    photo_path, extra_photos = _save_report_photos(form.photos.data)

    issue = Issue(
        facility_id = facility.id,
        area_id     = area.id,
        severity    = 'medium',
        description = description,
        photo_path  = photo_path,
        mobile_photo_paths = extra_photos,
        status      = 'open',
        reported_at = now_eastern(),
        reported_by = None,
    )
    db.session.add(issue)
    db.session.commit()

    _photo_count = (1 if photo_path else 0) + (len(extra_photos) if extra_photos else 0)
    logger.info('PUBLIC REPORT | issue_id=%s | area_id=%s | facility_id=%s | ip=%s | photos=%s',
                issue.id, area.id, facility.id, request.remote_addr, _photo_count)

    notify_by_matrix(
        event_type  = 'issue_created',
        title       = f'New Issue #{issue.id} at {facility.name} — {area.name} (QR report)',
        body        = (
            f'A problem was reported in {area.name} at {facility.name} via the area '
            f'QR code. Description: {form.description.data.strip()[:120]}'
            f'{"…" if len(form.description.data.strip()) > 120 else ""}'
        ),
        link        = url_for('issues.view', issue_id=issue.id),
        issue_id    = issue.id,
        facility_id = facility.id,
    )
    db.session.commit()

    flash('Thank you — your report has been received and the team has been notified.',
          'success')
    return redirect(url_for('public.area_summary', token=token))