from pathlib import Path
from flask import Blueprint, request, session, redirect, flash
import bcrypt
import auth
import config_utils
import sanitize

_PAGE = Path(__file__).parent.name

bp = Blueprint(_PAGE, __name__)


def _tz_to_offset_seconds(tz_str):
    try:
        from zoneinfo import ZoneInfo
        from datetime import datetime
        return int(datetime.now(ZoneInfo(tz_str)).utcoffset().total_seconds())
    except Exception:
        import settings as _s
        return _s.get_host_utc_offset()


@bp.route('/action/preferences/accountdetails_save', methods=['POST'])
@auth.require_level('viewer')
def accountdetails_save():
    tz = sanitize.timezone(request.form.get('timezone', '').strip())

    if not tz:
        flash('Timezone is required.', 'error')
        return redirect(f'/{_PAGE}')

    tz_offset = _tz_to_offset_seconds(tz)
    session['timezone'] = tz
    session['tz_offset_seconds'] = tz_offset

    flash('Preferences saved.', 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/preferences/changepassword_save', methods=['POST'])
@auth.require_level('viewer')
def changepassword_save():
    current_password = request.form.get('current_password', '')
    new_password     = request.form.get('new_password', '')
    confirm_password = request.form.get('confirm_password', '')

    if not current_password or not new_password or not confirm_password:
        flash('All fields are required.', 'error')
        return redirect(f'/{_PAGE}')

    if new_password != confirm_password:
        flash('New passwords do not match.', 'error')
        return redirect(f'/{_PAGE}')

    if len(new_password) < 8:
        flash('New password must be at least 8 characters.', 'error')
        return redirect(f'/{_PAGE}')

    account = config_utils.get_account_by_id(session.get('account_id', ''))
    if account is None:
        flash('Account not found. Please log in again.', 'error')
        return redirect('/accountlogin')

    if not bcrypt.checkpw(current_password.encode('utf-8'), account['hashed_password'].encode('utf-8')):
        flash('Current password is incorrect.', 'error')
        return redirect(f'/{_PAGE}')

    hashed = bcrypt.hashpw(new_password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')

    try:
        con = config_utils.open_accounts_db()
        con.execute(
            'UPDATE accounts SET hashed_password=? WHERE account_id=?',
            (hashed, account['account_id'])
        )
        con.commit()
        con.close()
    except Exception as exc:
        flash(f'Could not update password: {exc}', 'error')
        return redirect(f'/{_PAGE}')

    flash('Password changed successfully.', 'success')
    return redirect(f'/{_PAGE}')