"""Register an iFrame front end panel."""
import voluptuous as vol

from homeassistant.const import CONF_ICON, CONF_URL
import homeassistant.helpers.config_validation as cv

DOMAIN = 'panel_iframe'

CONF_TITLE = 'title'

CONF_RELATIVE_URL_ERROR_MSG = "Invalid relative URL. Absolute path required."
CONF_RELATIVE_URL_REGEX = r'\A/'
CONF_REQUIRE_ADMIN = 'require_admin'

CONFIG_SCHEMA = vol.Schema({
    DOMAIN: cv.schema_with_slug_keys(
        vol.Schema({
            # pylint: disable=no-value-for-parameter
            vol.Optional(CONF_TITLE): cv.string,
            vol.Optional(CONF_ICON): cv.icon,
            vol.Optional(CONF_REQUIRE_ADMIN, default=False): cv.boolean,
            vol.Required(CONF_URL): vol.Any(
                vol.Match(
                    CONF_RELATIVE_URL_REGEX,
                    msg=CONF_RELATIVE_URL_ERROR_MSG),
                vol.Url()),
        })
    )
}, extra=vol.ALLOW_EXTRA)


async def async_setup(hass, config):
    """Set up the iFrame frontend panels."""
    for url_path, info in config[DOMAIN].items():
        hass.components.frontend.async_register_built_in_panel(
            'iframe', info.get(CONF_TITLE), info.get(CONF_ICON),
            url_path, {'url': info[CONF_URL]},
            require_admin=info[CONF_REQUIRE_ADMIN])

    return True
