from pathlib import Path
import copy

from flask import Blueprint, request, redirect, flash
from auth import require_level
from config_utils import load_config, record_group, diff_fields, verify_config_hash
import sanitize
import mod_validation as validate

_PAGE = Path(__file__).parent.name

bp = Blueprint(_PAGE, __name__)


@bp.route('/action/mdns/settings_apply', methods=['POST'])
@require_level('administrator')
def settings_apply():
    mdns_enabled = 'mdns_enabled' in request.form

    if not verify_config_hash(request.form.get('config_hash', '')):
        flash('Configuration was modified by another session. Please refresh and try again.', 'error')
        return redirect(f'/{_PAGE}')

    cfg = load_config()
    mdns_reflect_vlans = sanitize.filterlist(
        request.form.getlist('mdns_reflect_vlans'),
        {v.get('name') for v in cfg.get('vlans', [])},
    )

    before = copy.deepcopy(cfg.get('mdns_reflection', {}))
    cfg.setdefault('mdns_reflection', {}).update({
        'enabled':       mdns_enabled,
        'reflect_vlans': mdns_reflect_vlans,
    })
    errors = validate.validate_config(cfg)
    if errors:
        for msg in errors:
            flash(msg, 'error')
        return redirect(f'/{_PAGE}')

    changes = diff_fields(before, cfg['mdns_reflection'])
    flash(record_group(cfg, 'mdns_reflection', None, None, changes, 'core apply'), 'success')
    return redirect(f'/{_PAGE}')