"""Routes salles - GMAO Collège"""
from datetime import date, datetime, timedelta
from flask import Blueprint, render_template, redirect, url_for, request, flash
from flask_login import login_required

from app_new.extensions import db
from app_new.core.models.college import Room, Zone, Building, RoomType, RoomSchedule
from app_new.core.models.equipment import Equipment

rooms_bp = Blueprint('rooms', __name__, template_folder='templates')


def _room_form_context(room=None):
    """Return all reference data used by the room form.

    The building list is deliberately loaded independently from the zone
    list.  Previously the GET route only supplied ``zones`` which left the
    required building select empty and made every room creation impossible.
    """
    return {
        'room': room,
        'buildings': Building.query.order_by(Building.name).all(),
        'zones': Zone.query.join(Building).order_by(Building.name, Zone.name).all(),
        'room_types': RoomType.query.order_by(RoomType.name).all(),
    }


@rooms_bp.route('/')
@login_required
def index():
    """Liste des salles."""
    zones_filter = request.args.getlist('zone') or None
    room_type_id = request.args.get('room_type', type=int)

    query = Room.query.join(Zone).join(Building)
    if zones_filter:
        query = query.filter(Zone.id.in_(zones_filter))
    if room_type_id:
        query = query.filter_by(room_type_id=room_type_id)
    rooms = query.order_by(Building.name, Zone.name, Room.name).all()
    zones = Zone.query.join(Building).order_by(Building.name, Zone.name).all()
    room_types = RoomType.query.order_by(RoomType.name).all()
    return render_template('equipments/rooms.html',
                          rooms=rooms, zones=zones, room_types=room_types,
                          selected_zones=[int(z) for z in zones_filter] if zones_filter else [])


@rooms_bp.route('/<int:id>')
@login_required
def detail(id):
    """Détail d'une salle."""
    room = Room.query.get_or_404(id)
    today = date.today()
    week_start = today - timedelta(days=today.weekday())
    courses = RoomSchedule.query.filter_by(
        room_id=room.id,
        week_start=week_start,
        day_of_week=today.weekday(),
    ).order_by(RoomSchedule.start_time).all()
    current_time = datetime.now().time()
    current_course = next(
        (course for course in courses
         if course.start_time <= current_time <= course.end_time),
        None,
    )
    next_course = next(
        (course for course in courses if course.start_time > current_time),
        None,
    )
    if current_course:
        room_status = {
            'status': 'occupee',
            'message': 'Salle actuellement occupée',
            'course': current_course,
            'next_occupied': None,
        }
    elif courses:
        room_status = {
            'status': 'libre',
            'message': 'Salle libre actuellement',
            'course': None,
            'next_occupied': next_course.start_time.strftime('%H:%M') if next_course else None,
        }
    else:
        room_status = {
            'status': 'inconnu',
            'message': "Aucun emploi du temps importé pour cette salle aujourd'hui.",
            'course': None,
            'next_occupied': None,
        }

    equipments = Equipment.query.filter(
        Equipment.room_id == room.id,
        Equipment.is_deleted.is_(False),
    ).order_by(Equipment.name, Equipment.individual_number).all()
    return render_template('equipments/room_detail.html',
                           room=room, equipments=equipments,
                           courses=courses, room_status=room_status)


@rooms_bp.route('/new', methods=['GET', 'POST'])
@login_required
def create():
    """Créer une salle."""
    if request.method == 'POST':
        name = (request.form.get('name') or '').strip()
        building_id = request.form.get('building_id', type=int)
        zone_id = request.form.get('zone_id', type=int)
        building = db.session.get(Building, building_id) if building_id else None
        zone = db.session.get(Zone, zone_id) if zone_id else None
        errors = []
        if not name:
            errors.append('Le nom de la salle est obligatoire.')
        if not building:
            errors.append('Sélectionnez un bâtiment valide.')
        if zone and building and zone.building_id != building.id:
            errors.append('La zone sélectionnée n’appartient pas au bâtiment choisi.')
        if errors:
            for error in errors:
                flash(error, 'danger')
            context = _room_form_context()
            context['form_data'] = request.form
            return render_template('equipments/room_form.html', **context), 400
        room = Room(
            name=name,
            code=request.form.get('code') or None,
            zone_id=zone_id,
            building_id=building.id,
            room_type_id=request.form.get('room_type_id', type=int),
            floor=request.form.get('floor', 0, type=int)
        )
        db.session.add(room)
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            flash('Impossible d’enregistrer cette salle. Vérifiez les valeurs saisies.', 'danger')
            context = _room_form_context()
            context['form_data'] = request.form
            return render_template('equipments/room_form.html', **context), 400
        flash(f"Salle '{room.name}' créée.", 'success')
        return redirect(url_for('rooms.index'))

    context = _room_form_context()
    context['form_data'] = {}
    context['title'] = 'Nouvelle salle'
    return render_template('equipments/room_form.html', **context)


@rooms_bp.route('/<int:id>/edit', methods=['GET', 'POST'])
@login_required
def edit(id):
    """Modifier une salle."""
    room = Room.query.get_or_404(id)

    if request.method == 'POST':
        name = (request.form.get('name') or '').strip()
        building_id = request.form.get('building_id', type=int)
        zone_id = request.form.get('zone_id', type=int)
        building = db.session.get(Building, building_id) if building_id else None
        zone = db.session.get(Zone, zone_id) if zone_id else None
        if not name or not building or (zone and zone.building_id != building.id):
            flash('Le nom, le bâtiment et une zone cohérente sont obligatoires.', 'danger')
            context = _room_form_context(room)
            context['form_data'] = request.form
            context['title'] = 'Modifier la salle'
            return render_template('equipments/room_form.html', **context), 400
        room.name = name
        room.code = request.form.get('code') or None
        room.zone_id = zone_id
        room.building_id = building.id
        room.room_type_id = request.form.get('room_type_id', type=int)
        room.floor = request.form.get('floor', 0, type=int)
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            flash('Impossible d’enregistrer cette salle. Vérifiez les valeurs saisies.', 'danger')
            context = _room_form_context(room)
            context['form_data'] = request.form
            context['title'] = 'Modifier la salle'
            return render_template('equipments/room_form.html', **context), 400
        flash(f"Salle '{room.name}' mise à jour.", 'success')
        return redirect(url_for('rooms.index'))

    context = _room_form_context(room)
    context['form_data'] = {}
    context['title'] = 'Modifier la salle'
    return render_template('equipments/room_form.html', **context)


@rooms_bp.route('/<int:id>/delete', methods=['POST'])
@login_required
def delete(id):
    """Supprimer une salle."""
    room = Room.query.get_or_404(id)
    db.session.delete(room)
    db.session.commit()
    flash(f"Salle '{room.name}' supprimée.", 'success')
    return redirect(url_for('rooms.index'))