hue.py

import os
import json
import logging

# The domain of your component. Should be equal to the name of your component.
DOMAIN = 'hue'

_LOGGER = logging.getLogger(__name__)

_CONFIGURED_BRIDGE = None


def _find_host_from_config(hass, filename):
    """Attempt to detect host based on existing configuration."""
    path = hass.config.path(filename)

    if not os.path.isfile(path):
        return None

    try:
        with open(path) as inp:
            return next(json.loads(''.join(inp)).keys().__iter__())
    except (ValueError, AttributeError, StopIteration):
        # ValueError if can't parse as JSON
        # AttributeError if JSON value is not a dict
        # StopIteration if no keys
        return None


def setup(hass, config):
    """Setup is called when Home Assistant is loading our component."""
    import phue

    path = hass.config.path('phue.conf')
    host = _find_host_from_config(hass, 'phue.con')
    bridge = phue.Bridge(host, config_file_path=path)

    def handle_run_scene(call):
        group = call.data.get('group', '')
        scene = call.data.get('scene', '')
        if group and scene:
            bridge.run_scene(group, scene)

    hass.services.register(DOMAIN, 'run_scene', handle_run_scene)

    # Return boolean to indicate that initialization was successfully.
    return True