# pylint: disable=C0111,R0903

"""Displays and changes the current selected prime video card

Left click will call 'sudo prime-select nvidia'
Right click will call 'sudo prime-select nvidia'

Running these commands without a password requires editing your sudoers file
(always use visudo, it's very easy to make a mistake and get locked out of your computer!)

sudo visudo -f /etc/sudoers.d/prime

Then put a line like this in there:

    user    ALL=(ALL) NOPASSWD: /usr/bin/prime-select

If you can't figure out the sudoers thing, then don't worry, it's still really useful.

Parameters:
    * prime.nvidiastring: String to use when nvidia is selected (defaults to 'intel')
    * prime.intelstring: String to use when intel is selected (defaults to 'intel')

Requires the following executable:
    * prime-select

"""

import bumblebee.util
import bumblebee.input
import bumblebee.output
import bumblebee.engine

class Module(bumblebee.engine.Module):
    def __init__(self, engine, config):
        super(Module, self).__init__(engine, config,
            bumblebee.output.Widget(full_text=self.query)
        )
        engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
            cmd=self._chooseNvidia)
        engine.input.register_callback(self, button=bumblebee.input.RIGHT_MOUSE,
            cmd=self._chooseIntel)

        self.nvidiastring = self.parameter('nvidiastring', 'nv')
        self.intelstring = self.parameter('intelstring', 'it')

    def _chooseNvidia(self, event):
        bumblebee.util.execute('sudo prime-select nvidia')

    def _chooseIntel(self, event):
        bumblebee.util.execute('sudo prime-select intel')

    def _prev_keymap(self, event):
        self._set_keymap(-1)

    def query(self, widget):
        try:
            res = bumblebee.util.execute('prime-select query')
        except RuntimeError:
            return 'n/a'

        for line in res.split('\n'):
            if not line: continue
            if 'nvidia' in line:
                return self.nvidiastring
            if 'intel' in line:
                return self.intelstring
        return 'n/a'

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