# pylint: disable=C0111,R0903

"""Displays battery status, remaining percentage and charging information.

Parameters:
    * battery.device              : Comma-separated list of battery devices to read information from (defaults to auto for auto-detection)
    * battery.warning             : Warning threshold in % of remaining charge (defaults to 20)
    * battery.critical            : Critical threshold in % of remaining charge (defaults to 10)
    * battery.showdevice          : If set to 'true', add the device name to the widget (defaults to False)
    * battery.decorate            : If set to 'false', hides additional icons (charging, etc.) (defaults to True)
    * battery.showpowerconsumption: If set to 'true', show current power consumption (defaults to False)
    * battery.compact-devices     : If set to 'true', compacts multiple batteries into a single entry (default to False)

(partially) contributed by `martindoublem <https://github.com/martindoublem>`_ - many thanks!
"""

import os
import glob
import logging

log = logging.getLogger(__name__)

try:
    import power
except ImportError:
    log.warning('unable to import module "power": Time estimates will not be available')

import core.module
import core.input

import util.format


class BatteryManager(object):
    def remaining(self):
        try:
            estimate = power.PowerManagement().get_time_remaining_estimate()
            # do not show remaining if on AC
            if estimate == power.common.TIME_REMAINING_UNLIMITED:
                return None
            return estimate * 60  # return value in seconds
        except Exception as e:
            return -1
        return -1

    def read(self, battery, component, default=None):
        path = "/sys/class/power_supply/{}".format(battery)
        if not os.path.exists(path):
            return default
        try:
            with open("{}/{}".format(path, component)) as f:
                return f.read().strip()
        except IOError:
            return "n/a"
        return default

    def capacity(self, battery):
        capacity = self.read(battery, "capacity", 100)
        if capacity != "n/a":
            capacity = int(capacity)

        return capacity if capacity < 100 else 100

    def capacity_all(self, batteries):
        now = 0
        full = 0
        for battery in batteries:
            try:
                with open(
                    "/sys/class/power_supply/{}/energy_full".format(battery)
                ) as f:
                    full += int(f.read())
                with open("/sys/class/power_supply/{}/energy_now".format(battery)) as f:
                    now += int(f.read())
            except IOError:
                return "n/a"
        return int(float(now) / float(full) * 100.0)

    def isac(self, battery):
        path = "/sys/class/power_supply/{}".format(battery)
        return not os.path.exists(path)

    def isac_any(self, batteries):
        for battery in batteries:
            if self.isac(battery):
                return True
        return False

    def consumption(self, battery):
        consumption = self.read(battery, "power_now", "n/a")
        if consumption == "n/a":
            return "n/a"
        return "{}W".format(int(consumption) / 1000000)

    def charge(self, battery):
        return self.read(battery, "status", "n/a")

    def charge_any(self, batteries):
        for battery in batteries:
            if self.charge(battery) == "Discharging":
                return "Discharging"
        return "Charged"


class Module(core.module.Module):
    def __init__(self, config, theme):
        super().__init__(config, theme, [])

        self.__manager = BatteryManager()

        self._batteries = util.format.aslist(self.parameter("device", "auto"))
        if self._batteries[0] == "auto":
            self._batteries = [
                os.path.basename(battery)
                for battery in glob.glob("/sys/class/power_supply/BAT*")
            ]
        if len(self._batteries) == 0:
            raise Exceptions("no batteries configured/found")
        core.input.register(
            self, button=core.input.LEFT_MOUSE, cmd="gnome-power-statistics"
        )

        if util.format.asbool(self.parameter("compact-devices", False)):
            widget = self.add_widget(full_text=self.capacity, name="all-batteries")
        else:
            for battery in self._batteries:
                log.debug("adding new widget for {}".format(battery))
                widget = self.add_widget(full_text=self.capacity, name=battery)
        for w in self.widgets():
            if util.format.asbool(self.parameter("decorate", True)) == False:
                widget.set("theme.exclude", "suffix")

    def capacity(self, widget):
        if widget.name == "all-batteries":
            capacity = self.__manager.capacity_all(self._batteries)
        else:
            capacity = self.__manager.capacity(widget.name)
        widget.set("capacity", capacity)
        widget.set("ac", self.__manager.isac_any(self._batteries))
        widget.set("theme.minwidth", "100%")

        # Read power conumption
        if util.format.asbool(self.parameter("showpowerconsumption", False)):
            output = "{}% ({})".format(
                capacity, self.__manager.consumption(widget.name)
            )
        else:
            output = "{}%".format(capacity)

        if (
            util.format.asbool(self.parameter("showremaining", True))
            and self.__manager.charge(widget.name) == "Discharging"
        ):
            remaining = self.__manager.remaining()
            if remaining >= 0:
                output = "{} {}".format(
                    output, util.format.duration(remaining, compact=True, unit=True)
                )

        if util.format.asbool(self.parameter("showdevice", False)):
            output = "{} ({})".format(output, widget.name)

        return output

    def state(self, widget):
        state = []
        capacity = widget.get("capacity")

        if capacity < 0:
            log.debug("battery state: {}".format(state))
            return ["critical", "unknown"]

        if capacity < int(self.parameter("critical", 10)):
            state.append("critical")
        elif capacity < int(self.parameter("warning", 20)):
            state.append("warning")

        if widget.get("ac"):
            state.append("AC")
        else:
            if widget.name == "all-batteries":
                charge = self.__manager.charge_any(self._batteries)
            else:
                charge = self.__manager.charge(widget.name)
            if charge == "Discharging":
                state.append(
                    "discharging-{}".format(
                        min([10, 25, 50, 80, 100], key=lambda i: abs(i - capacity))
                    )
                )
            elif charge == "Unknown":
                state.append(
                    "unknown-{}".format(
                        min([10, 25, 50, 80, 100], key=lambda i: abs(i - capacity))
                    )
                )
            else:
                if capacity > 95:
                    state.append("charged")
                else:
                    state.append("charging")
        return state


# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4