"""
Support for Rheem EcoNet water heaters.

For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/water_heater.econet/
"""
import datetime
import logging

import voluptuous as vol

from homeassistant.components.water_heater import (
    DOMAIN, PLATFORM_SCHEMA, STATE_ECO, STATE_ELECTRIC, STATE_GAS,
    STATE_HEAT_PUMP, STATE_HIGH_DEMAND, STATE_OFF, STATE_PERFORMANCE,
    SUPPORT_OPERATION_MODE, SUPPORT_TARGET_TEMPERATURE, WaterHeaterDevice)
from homeassistant.const import (
    ATTR_ENTITY_ID, ATTR_TEMPERATURE, CONF_PASSWORD, CONF_USERNAME,
    TEMP_FAHRENHEIT)
import homeassistant.helpers.config_validation as cv

REQUIREMENTS = ['pyeconet==0.0.6']

_LOGGER = logging.getLogger(__name__)

ATTR_VACATION_START = 'next_vacation_start_date'
ATTR_VACATION_END = 'next_vacation_end_date'
ATTR_ON_VACATION = 'on_vacation'
ATTR_TODAYS_ENERGY_USAGE = 'todays_energy_usage'
ATTR_IN_USE = 'in_use'

ATTR_START_DATE = 'start_date'
ATTR_END_DATE = 'end_date'

SUPPORT_FLAGS_HEATER = (SUPPORT_TARGET_TEMPERATURE | SUPPORT_OPERATION_MODE)

SERVICE_ADD_VACATION = 'econet_add_vacation'
SERVICE_DELETE_VACATION = 'econet_delete_vacation'

ADD_VACATION_SCHEMA = vol.Schema({
    vol.Optional(ATTR_ENTITY_ID): cv.entity_ids,
    vol.Optional(ATTR_START_DATE): cv.positive_int,
    vol.Required(ATTR_END_DATE): cv.positive_int,
})

DELETE_VACATION_SCHEMA = vol.Schema({
    vol.Optional(ATTR_ENTITY_ID): cv.entity_ids,
})

ECONET_DATA = 'econet'

HA_STATE_TO_ECONET = {
    STATE_ECO: 'Energy Saver',
    STATE_ELECTRIC: 'Electric',
    STATE_HEAT_PUMP: 'Heat Pump',
    STATE_GAS: 'gas',
    STATE_HIGH_DEMAND: 'High Demand',
    STATE_OFF: 'Off',
    STATE_PERFORMANCE: 'Performance'
}

ECONET_STATE_TO_HA = {value: key for key, value in HA_STATE_TO_ECONET.items()}

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Required(CONF_USERNAME): cv.string,
    vol.Required(CONF_PASSWORD): cv.string,
})


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the EcoNet water heaters."""
    from pyeconet.api import PyEcoNet

    hass.data[ECONET_DATA] = {}
    hass.data[ECONET_DATA]['water_heaters'] = []

    username = config.get(CONF_USERNAME)
    password = config.get(CONF_PASSWORD)

    econet = PyEcoNet(username, password)
    water_heaters = econet.get_water_heaters()
    hass_water_heaters = [
        EcoNetWaterHeater(water_heater) for water_heater in water_heaters]
    add_entities(hass_water_heaters)
    hass.data[ECONET_DATA]['water_heaters'].extend(hass_water_heaters)

    def service_handle(service):
        """Handle the service calls."""
        entity_ids = service.data.get('entity_id')
        all_heaters = hass.data[ECONET_DATA]['water_heaters']
        _heaters = [
            x for x in all_heaters
            if not entity_ids or x.entity_id in entity_ids]

        for _water_heater in _heaters:
            if service.service == SERVICE_ADD_VACATION:
                start = service.data.get(ATTR_START_DATE)
                end = service.data.get(ATTR_END_DATE)
                _water_heater.add_vacation(start, end)
            if service.service == SERVICE_DELETE_VACATION:
                for vacation in _water_heater.water_heater.vacations:
                    vacation.delete()

            _water_heater.schedule_update_ha_state(True)

    hass.services.register(DOMAIN, SERVICE_ADD_VACATION, service_handle,
                           schema=ADD_VACATION_SCHEMA)

    hass.services.register(DOMAIN, SERVICE_DELETE_VACATION, service_handle,
                           schema=DELETE_VACATION_SCHEMA)


class EcoNetWaterHeater(WaterHeaterDevice):
    """Representation of an EcoNet water heater."""

    def __init__(self, water_heater):
        """Initialize the water heater."""
        self.water_heater = water_heater

    @property
    def name(self):
        """Return the device name."""
        return self.water_heater.name

    @property
    def available(self):
        """Return if the the device is online or not."""
        return self.water_heater.is_connected

    @property
    def temperature_unit(self):
        """Return the unit of measurement."""
        return TEMP_FAHRENHEIT

    @property
    def device_state_attributes(self):
        """Return the optional device state attributes."""
        data = {}
        vacations = self.water_heater.get_vacations()
        if vacations:
            data[ATTR_VACATION_START] = vacations[0].start_date
            data[ATTR_VACATION_END] = vacations[0].end_date
        data[ATTR_ON_VACATION] = self.water_heater.is_on_vacation
        todays_usage = self.water_heater.total_usage_for_today
        if todays_usage:
            data[ATTR_TODAYS_ENERGY_USAGE] = todays_usage
        data[ATTR_IN_USE] = self.water_heater.in_use

        return data

    @property
    def current_operation(self):
        """
        Return current operation as one of the following.

        ["eco", "heat_pump", "high_demand", "electric_only"]
        """
        current_op = ECONET_STATE_TO_HA.get(self.water_heater.mode)
        return current_op

    @property
    def operation_list(self):
        """List of available operation modes."""
        op_list = []
        modes = self.water_heater.supported_modes
        for mode in modes:
            ha_mode = ECONET_STATE_TO_HA.get(mode)
            if ha_mode is not None:
                op_list.append(ha_mode)
            else:
                error = "Invalid operation mode mapping. " + mode + \
                    " doesn't map. Please report this."
                _LOGGER.error(error)
        return op_list

    @property
    def supported_features(self):
        """Return the list of supported features."""
        return SUPPORT_FLAGS_HEATER

    def set_temperature(self, **kwargs):
        """Set new target temperature."""
        target_temp = kwargs.get(ATTR_TEMPERATURE)
        if target_temp is not None:
            self.water_heater.set_target_set_point(target_temp)
        else:
            _LOGGER.error("A target temperature must be provided")

    def set_operation_mode(self, operation_mode):
        """Set operation mode."""
        op_mode_to_set = HA_STATE_TO_ECONET.get(operation_mode)
        if op_mode_to_set is not None:
            self.water_heater.set_mode(op_mode_to_set)
        else:
            _LOGGER.error("An operation mode must be provided")

    def add_vacation(self, start, end):
        """Add a vacation to this water heater."""
        if not start:
            start = datetime.datetime.now()
        else:
            start = datetime.datetime.fromtimestamp(start)
        end = datetime.datetime.fromtimestamp(end)
        self.water_heater.set_vacation_mode(start, end)

    def update(self):
        """Get the latest date."""
        self.water_heater.update_state()

    @property
    def target_temperature(self):
        """Return the temperature we try to reach."""
        return self.water_heater.set_point

    @property
    def min_temp(self):
        """Return the minimum temperature."""
        return self.water_heater.min_set_point

    @property
    def max_temp(self):
        """Return the maximum temperature."""
        return self.water_heater.max_set_point
