from pathlib import Path
import copy
import os
from flask import Blueprint, request, redirect, flash, send_file, abort
from auth import require_level
from config_utils import load_config, verify_config_hash, record_group, diff_fields, CONFIGS_DIR
import sanitize
import mod_validation as validate

_PAGE = Path(__file__).parent.name

bp = Blueprint(_PAGE, __name__)

LOG_FILE = f'{CONFIGS_DIR}/ddns.log'


@bp.route('/action/ddns/addaccount_add', methods=['POST'])
@require_level('administrator')
def addaccount_add():
    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(f'/{_PAGE}')
    if not hostnames:
        flash('At least one hostname is required.', 'error')
        return redirect(f'/{_PAGE}')
    if not provider_type:
        flash('Unknown provider type.', 'error')
        return redirect(f'/{_PAGE}')

    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}')

    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()

    cfg = load_config()
    cfg.setdefault('ddns', {}).setdefault('providers', []).append(entry)
    changes = diff_fields(None, entry)
    flash(record_group(cfg, 'ddns.providers', 'description', description, changes, 'ddns update', queue=False), 'success')
    return redirect(f'/{_PAGE}')


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

    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(f'/{_PAGE}')

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

    before = copy.deepcopy(providers[row_index])
    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
    changes = diff_fields(before, entry)
    flash(record_group(cfg, 'ddns.providers', 'description', description, changes, 'ddns update', queue=False), 'success')
    return redirect(f'/{_PAGE}')


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

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

    before = copy.deepcopy(providers[row_index])
    description = before.get('description', str(row_index))
    del providers[row_index]
    changes = diff_fields(before, None)
    flash(record_group(cfg, 'ddns.providers', 'description', description, changes, 'ddns update', queue=False), 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/ddns/ipcheckinterval_save', methods=['POST'])
@require_level('administrator')
def ipcheckinterval_save():
    raw = request.form.get('timer_interval', '').strip()
    try:
        mins = int(raw)
        if mins < 1:
            raise ValueError
    except ValueError:
        flash('Interval must be a whole number of minutes >= 1.', 'error')
        return redirect(f'/{_PAGE}')
    timer_interval = f'{mins}m'

    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()
    before = copy.deepcopy(cfg.get('ddns', {}).get('general', {}))
    cfg.setdefault('ddns', {}).setdefault('general', {})['timer_interval'] = timer_interval
    changes = diff_fields(before, cfg['ddns']['general'])
    flash(record_group(cfg, 'ddns.general', None, None, changes, 'core apply'), 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/ddns/ipcheckservices_save', methods=['POST'])
@require_level('administrator')
def ipcheckservices_save():
    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}')

    http_services = [u.strip() for u in request.form.getlist('http_services') if u.strip()]
    dig_services  = [u.strip() for u in request.form.getlist('dig_services')  if u.strip()]

    if not http_services and not dig_services:
        flash('At least one IP check service is required.', 'error')
        return redirect(f'/{_PAGE}')

    cfg     = load_config()
    before   = copy.deepcopy(cfg.get('ddns', {}).get('ip_check_services', []))
    services = [{'type': 'http', 'url': u} for u in http_services]
    services += [{'type': 'dig',  'url': u} for u in dig_services]
    cfg.setdefault('ddns', {})['ip_check_services'] = services
    changes = diff_fields({'ip_check_services': before}, {'ip_check_services': services})
    flash(record_group(cfg, 'ddns', None, None, changes, 'ddns update', queue=False), 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/ddns/logging_save', methods=['POST'])
@require_level('administrator')
def logging_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(f'/{_PAGE}')
    log_errors_only = 'log_errors_only' 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()
    before = copy.deepcopy(cfg.get('ddns', {}).get('general', {}))
    cfg.setdefault('ddns', {}).setdefault('general', {}).update({
        'log_max_kb':      log_max_kb,
        'log_errors_only': log_errors_only,
    })
    changes = diff_fields(before, cfg['ddns']['general'])
    flash(record_group(cfg, 'ddns.general', None, None, changes, 'ddns update', queue=False), 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/ddns/logging_clear', methods=['POST'])
@require_level('administrator')
def logging_clear():
    try:
        open(LOG_FILE, 'w').close()
        flash('DDNS log cleared.', 'success')
    except Exception as ex:
        flash(f'Could not clear log: {ex}', 'error')
    return redirect(f'/{_PAGE}')


@bp.route('/action/ddns/logging_download', methods=['GET'])
@require_level('administrator')
def logging_download():
    if not os.path.isfile(LOG_FILE):
        abort(404)
    return send_file(LOG_FILE, as_attachment=True, download_name='ddns.log', mimetype='text/plain')