"""Multiwidget CPU module

Can display any combination of:

    * max CPU frequency
    * total CPU load in percents (integer value)
    * per-core CPU load as graph - either mono or colored
    * CPU temperature (in Celsius degrees)
    * CPU fan speed

Requirements:

    * the psutil Python module for the first three items from the list above
    * sensors executable for the rest

Parameters:
    * cpu2.layout: Space-separated list of widgets to add.
      Possible widgets are:

         * cpu2.maxfreq
         * cpu2.cpuload
         * cpu2.coresload
         * cpu2.temp
         * cpu2.fanspeed
    * cpu2.colored: 1 for colored per core load graph, 0 for mono (default)
    * cpu2.temp_pattern: pattern to look for in the output of 'sensors -u';
      required if cpu2.temp widged is used
    * cpu2.fan_pattern: pattern to look for in the output of 'sensors -u';
      required if cpu2.fanspeed widged is used

Note: if you are getting 'n/a' for CPU temperature / fan speed, then you're
lacking the aforementioned pattern settings or they have wrong values.

"""

import psutil

import core.module
import core.widget

import util.cli
import util.graph
import util.format


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

        self.__layout = self.parameter(
            "layout", "cpu2.maxfreq cpu2.cpuload cpu2.coresload cpu2.temp cpu2.fanspeed"
        )
        self.__widget_names = self.__layout.split()
        self.__colored = util.format.asbool(self.parameter("colored", False))
        widget_list = []
        for widget_name in self.__widget_names:
            if widget_name == "cpu2.maxfreq":
                widget = core.widget.Widget(name=widget_name, full_text=self.maxfreq)
                widget.set("type", "freq")
            elif widget_name == "cpu2.cpuload":
                widget = core.widget.Widget(name=widget_name, full_text=self.cpuload)
                widget.set("type", "load")
            elif widget_name == "cpu2.coresload":
                widget = core.widget.Widget(name=widget_name, full_text=self.coresload)
                widget.set("type", "loads")
            elif widget_name == "cpu2.temp":
                widget = core.widget.Widget(name=widget_name, full_text=self.temp)
                widget.set("type", "temp")
            elif widget_name == "cpu2.fanspeed":
                widget = core.widget.Widget(name=widget_name, full_text=self.fanspeed)
                widget.set("type", "fan")
            if self.__colored:
                widget.set("pango", True)
            widget_list.append(widget)
        self.widgets(widget_list)
        self.__temp_pattern = self.parameter("temp_pattern")
        if self.__temp_pattern is None:
            self.__temp = "n/a"
        self.__fan_pattern = self.parameter("fan_pattern")
        if self.__fan_pattern is None:
            self.__fan = "n/a"
        # maxfreq is loaded only once at startup
        if "cpu2.maxfreq" in self.__widget_names:
            self.__maxfreq = psutil.cpu_freq().max / 1000

    def maxfreq(self, _):
        return "{:.2f}GHz".format(self.__maxfreq)

    def cpuload(self, _):
        return "{:>3}%".format(self.__cpuload)

    def add_color(self, bar):
        """add color as pango markup to a bar"""
        if bar in ["▁", "▂"]:
            color = self.theme.color("green", "green")
        elif bar in ["▃", "▄"]:
            color = self.theme.color("yellow", "yellow")
        elif bar in ["▅", "▆"]:
            color = self.theme.color("orange", "orange")
        elif bar in ["▇", "█"]:
            color = self.theme.color("red", "red")
        colored_bar = '<span foreground="{}">{}</span>'.format(color, bar)
        return colored_bar

    def coresload(self, _):
        mono_bars = [util.graph.hbar(x) for x in self.__coresload]
        if not self.__colored:
            return "".join(mono_bars)
        colored_bars = [self.add_color(x) for x in mono_bars]
        return "".join(colored_bars)

    def temp(self, _):
        if self.__temp == "n/a" or self.__temp == 0:
            return "n/a"
        return "{}°C".format(self.__temp)

    def fanspeed(self, _):
        if self.__fanspeed == "n/a":
            return "n/a"
        return "{}RPM".format(self.__fanspeed)

    def _parse_sensors_output(self):
        output = util.cli.execute("sensors -u")
        lines = output.split("\n")
        temp = "n/a"
        fan = "n/a"
        temp_line = None
        fan_line = None
        for line in lines:
            if self.__temp_pattern is not None and self.__temp_pattern in line:
                temp_line = line
            if self.__fan_pattern is not None and self.__fan_pattern in line:
                fan_line = line
            if temp_line is not None and fan_line is not None:
                break
        if temp_line is not None:
            temp = round(float(temp_line.split(":")[1].strip()))
        if fan_line is not None:
            fan = int(fan_line.split(":")[1].strip()[:-4])
        return temp, fan

    def update(self):
        if "cpu2.maxfreq" in self.__widget_names:
            self.__maxfreq = psutil.cpu_freq().max / 1000
        if "cpu2.cpuload" in self.__widget_names:
            self.__cpuload = round(psutil.cpu_percent(percpu=False))
        if "cpu2.coresload" in self.__widget_names:
            self.__coresload = psutil.cpu_percent(percpu=True)
        if "cpu2.temp" in self.__widget_names or "cpu2.fanspeed" in self.__widget_names:
            self.__temp, self.__fanspeed = self._parse_sensors_output()

    def state(self, widget):
        """for having per-widget icons"""
        return [widget.get("type", "")]


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