# pylint: disable=C0111,R0903

'''Shows a widget for each connected screen and allows the user to enable/disable screens.

Parameters:
    * xrandr.overwrite_i3config: If set to 'true', this module assembles a new i3 config
        every time a screen is enabled or disabled by taking the file '~/.config/i3/config.template'
        and appending a file '~/.config/i3/config.<screen name>' for every screen.
    * xrandr.autoupdate: If set to 'false', does *not* invoke xrandr automatically. Instead, the
        module will only refresh when displays are enabled or disabled (defaults to true)

Requires the following python module:
    * (optional) i3 - if present, the need for updating the widget list is auto-detected

Requires the following executable:
    * xrandr
'''

import os
import re
import sys

import core.module
import core.widget
import core.input
import core.decorators

import util.cli
import util.format

try:
    import i3
except:
    pass

class Module(core.module.Module):
    @core.decorators.every(seconds=5) # takes up to 5s to detect a new screen
    def __init__(self, config):
        widgets = []
        super().__init__(config, widgets)

        self._autoupdate = util.format.asbool(self.parameter('autoupdate', True))
        self._needs_update = True

        try:
            i3.Subscription(self._output_update, 'output')
        except:
            pass

    def _output_update(self, event, data, _):
        self._needs_update = True

    def update(self):
        new_widgets = []

        if self._autoupdate == False and self._needs_update == False:
            return

        self._needs_update = False

        for line in util.cli.execute('xrandr -q').split('\n'):
            if not ' connected' in line:
                continue
            display = line.split(' ', 2)[0]
            m = re.search(r'\d+x\d+\+(\d+)\+\d+', line)

            widget = self.widget(display)
            if not widget:
                widget = core.widget.Widget(full_text=display, name=display)
                core.input.register(widget, button=1, cmd=self._toggle)
                core.input.register(widget, button=3, cmd=self._toggle)
            new_widgets.append(widget)
            widget.module(self)
            widget.set('state', 'on' if m else 'off')
            widget.set('pos', int(m.group(1)) if m else sys.maxsize)

        self.widgets(new_widgets)

        if self._autoupdate == False:
            widget = core.widget.Widget(full_text='')
            widget.module(self)
            widget.set('state', 'refresh')
            core.input.register(widget, button=1, cmd=self._refresh)
            self.widgets().append(widget)

    def state(self, widget):
        return widget.get('state', 'off')

    def _refresh(self, event):
        self._needs_update = True

    def _toggle(self, event):
        self._refresh(self, event)
        path = os.path.dirname(os.path.abspath(__file__))

        if util.format.asbool(self.parameter('overwrite_i3config', False)) == True:
            toggle_cmd = '{}/../../bin/toggle-display.sh'.format(path)
        else:
            toggle_cmd = 'xrandr'

        widget = self.widget_by_id(event['instance'])

        if widget.get('state') == 'on':
            util.cli.execute('{} --output {} --off'.format(toggle_cmd, widget.name))
        else:
            first_neighbor = next((widget for widget in self.widgets() if widget.get('state') == 'on'), None)
            last_neighbor = next((widget for widget in reversed(self.widgets()) if widget.get('state') == 'on'), None)

            neighbor = first_neighbor if event['button'] == core.input.LEFT_MOUSE else last_neighbor

            if neighbor is None:
                util.cli.execute('{} --output {} --auto'.format(toggle_cmd, widget.name))
            else:
                util.cli.execute('{} --output {} --auto --{}-of {}'.format(toggle_cmd, widget.name,
                    'left' if event.get('button') == core.input.LEFT_MOUSE else 'right',
                    neighbor.name))

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