# 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, theme):
        widgets = []
        super().__init__(config, theme, 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, module=self
                )
                core.input.register(widget, button=1, cmd=self._toggle)
                core.input.register(widget, button=3, cmd=self._toggle)
            new_widgets.append(widget)
            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="", 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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