import re
from flask import Blueprint, request, redirect, flash
from auth import require_level
from config_utils import load_core, save_core, verify_core_hash, queued_msg
import sanitize
import validation as validate

bp = Blueprint('action_apply_ddns_providers', __name__)

VIEW = '/view/view_ddns'


@bp.route('/action/add_ddns_provider', methods=['POST'])
@require_level('administrator')
def add_ddns_provider():
    provider_type = sanitize.filtervalue(request.form.get('provider', ''), validate.VALID_DDNS_PROVIDERS)
    description   = sanitize.description(request.form.get('description', ''))
    hostnames     = sanitize.domainlist(request.form.get('hostnames', '').splitlines())

    if not description:
        flash('Description is required.', 'error')
        return redirect(VIEW)
    if not hostnames:
        flash('At least one hostname is required.', 'error')
        return redirect(VIEW)
    if not provider_type:
        flash('Unknown provider type.', 'error')
        return redirect(VIEW)

    entry = {
        'description': description,
        'provider':    provider_type,
        'enabled':     True,
        'hostnames':   hostnames,
    }
    if provider_type == 'noip':
        entry['username'] = request.form.get('username', '').strip()
        entry['password'] = request.form.get('password', '').strip()
    else:
        entry['api_token'] = request.form.get('api_token', '').strip()

    core = load_core()
    core.setdefault('ddns', {}).setdefault('providers', []).append(entry)
    save_core(core)
    flash(f'DDNS provider "{description}" added.', 'success')
    return redirect(VIEW)


@bp.route('/action/edit_ddns_provider', methods=['POST'])
@require_level('administrator')
def edit_ddns_provider():
    try:
        row_index = int(request.form.get('row_index', -1))
    except (TypeError, ValueError):
        flash('Invalid row index.', 'error')
        return redirect(VIEW)

    provider_type = sanitize.filtervalue(request.form.get('provider', ''), validate.VALID_DDNS_PROVIDERS)
    description   = sanitize.description(request.form.get('description', ''))
    hostnames     = [h.strip() for h in request.form.get('hostnames', '').splitlines() if h.strip()]
    enabled       = request.form.get('enabled') == 'on'

    if not provider_type:
        flash('Unknown provider type.', 'error')
        return redirect(VIEW)

    core      = load_core()
    providers = core.setdefault('ddns', {}).setdefault('providers', [])
    if row_index < 0 or row_index >= len(providers):
        flash('Invalid provider index.', 'error')
        return redirect(VIEW)

    entry = {
        'description': description,
        'provider':    provider_type,
        'enabled':     enabled,
        'hostnames':   hostnames,
    }
    if provider_type == 'noip':
        entry['username'] = request.form.get('username', '').strip()
        entry['password'] = request.form.get('password', '').strip()
    else:
        entry['api_token'] = request.form.get('api_token', '').strip()

    providers[row_index] = entry
    save_core(core)
    flash('DDNS provider updated.', 'success')
    return redirect(VIEW)


@bp.route('/action/ddns_cardlog_save', methods=['POST'])
@require_level('administrator')
def ddns_cardlog_save():
    log_max_kb = validate.int_range(request.form.get('log_max_kb', '').strip(), 64, None)
    if log_max_kb is None:
        flash('Max Log Size must be a number >= 64.', 'error')
        return redirect(VIEW)
    log_errors_only = 'log_errors_only' in request.form
    if not verify_core_hash(request.form.get('config_hash', '')):
        flash('Configuration was modified by another session. Please refresh and try again.', 'error')
        return redirect(VIEW)
    core = load_core()
    core.setdefault('ddns', {}).setdefault('general', {}).update({
        'log_max_kb':      log_max_kb,
        'log_errors_only': log_errors_only,
    })
    save_core(core)
    flash('DDNS log settings saved.', 'success')
    return redirect(VIEW)


@bp.route('/action/ddns_cardinterval_save', methods=['POST'])
@require_level('administrator')
def ddns_cardinterval_save():
    timer_interval = request.form.get('timer_interval', '').strip()
    if not re.match(r'^\d+[mhd]$', timer_interval):
        flash('Invalid interval. Use a number followed by m, h, or d (e.g. 10m, 1h).', 'error')
        return redirect(VIEW)
    if not verify_core_hash(request.form.get('config_hash', '')):
        flash('Configuration was modified by another session. Please refresh and try again.', 'error')
        return redirect(VIEW)
    core = load_core()
    core.setdefault('ddns', {}).setdefault('general', {})['timer_interval'] = timer_interval
    save_core(core)
    flash(queued_msg('core apply'), 'success')
    return redirect(VIEW)


@bp.route('/action/delete_ddns_provider', methods=['POST'])
@require_level('administrator')
def delete_ddns_provider():
    try:
        row_index = int(request.form.get('row_index', -1))
    except (TypeError, ValueError):
        flash('Invalid row index.', 'error')
        return redirect(VIEW)

    core      = load_core()
    providers = core.setdefault('ddns', {}).setdefault('providers', [])
    if row_index < 0 or row_index >= len(providers):
        flash('Invalid provider index.', 'error')
        return redirect(VIEW)

    del providers[row_index]
    save_core(core)
    flash('DDNS provider deleted.', 'success')
    return redirect(VIEW)