# pylint: disable=C0111,R0903

"""Displays information about the current song in cmus.

Requires the following executable:
    * cmus-remote

Parameters:
    * cmus.format: Format string for the song information. Tag values can be put in curly brackets (i.e. {artist})
      Additional tags:
        * {file} - full song file name
        * {file1} - song file name without path prefix
                    if {file} = '/foo/bar.baz', then {file1} = 'bar.baz'
        * {file2} - song file name without path prefix and extension suffix
                    if {file} = '/foo/bar.baz', then {file2} = 'bar'
    * cmus.layout: Space-separated list of widgets to add. Possible widgets are the buttons/toggles cmus.prev, cmus.next, cmus.shuffle and cmus.repeat, and the main display with play/pause function cmus.main.
    * cmus.server: The address of the cmus server, either a UNIX socket or host[:port]. Connects to the local instance by default.
    * cmus.passwd: The password to use for the TCP/IP connection.

"""

from collections import defaultdict

import os
import string

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

import util.cli
import util.format

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

        self._layout = self.parameter('layout', 'cmus.prev cmus.main cmus.next cmus.shuffle cmus.repeat')
        self._fmt = self.parameter('format', '{artist} - {title} {position}/{duration}')
        self._server = self.parameter('server', None)
        self._passwd = self.parameter('passwd', None)
        self._status = None
        self._shuffle = False
        self._repeat = False
        self._tags = defaultdict(lambda: '')

        # Create widgets
        widget_list = []
        widget_map = {}
        for widget_name in self._layout.split():
            widget = core.widget.Widget(name=widget_name, module=self)
            widget_list.append(widget)
            self._cmd = 'cmus-remote'
            if self._server is not None:
                self._cmd = '{cmd} --server {server}'.format(cmd=self._cmd, server=self._server)
                if self._passwd is not None:
                    self._cmd = '{cmd} --passwd {passwd}'.format(cmd=self._cmd, passwd=self._passwd)

            if widget_name == 'cmus.prev':
                widget_map[widget] = {'button': core.input.LEFT_MOUSE, 'cmd': '{cmd} -r'.format(cmd=self._cmd)}
            elif widget_name == 'cmus.main':
                widget_map[widget] = {'button': core.input.LEFT_MOUSE, 'cmd': '{cmd} -u'.format(cmd=self._cmd)}
                widget.full_text(self.description)
            elif widget_name == 'cmus.next':
                widget_map[widget] = {'button': core.input.LEFT_MOUSE, 'cmd': '{cmd} -n'.format(cmd=self._cmd)}
            elif widget_name == 'cmus.shuffle':
                widget_map[widget] = {'button': core.input.LEFT_MOUSE, 'cmd': '{cmd} -S'.format(cmd=self._cmd)}
            elif widget_name == 'cmus.repeat':
                widget_map[widget] = {'button': core.input.LEFT_MOUSE, 'cmd': '{cmd} -R'.format(cmd=self._cmd)}
            else:
                raise KeyError('The cmus module does not support a {widget_name!r} widget'.format(widget_name=widget_name))
        self.widgets(widget_list)

        # Register input callbacks
        for widget, callback_options in widget_map.items():
            core.input.register(widget, **callback_options)

    def hidden(self):
        return self._status is None

    @core.decorators.scrollable
    def description(self, widget):
        return string.Formatter().vformat(self._fmt, (), self._tags)

    def update(self):
        self._load_song()

    def state(self, widget):
        returns = {
            'cmus.shuffle': 'shuffle-on' if self._shuffle else 'shuffle-off',
            'cmus.repeat': 'repeat-on' if self._repeat else 'repeat-off',
            'cmus.prev': 'prev',
            'cmus.next': 'next',
        }
        return returns.get(widget.name, self._status)

    def _eval_line(self, line):
        if line.startswith('file '):
            full_file = line[5:]
            file1 = os.path.basename(full_file)
            file2 = os.path.splitext(file1)[0]
            self._tags.update({'file': full_file})
            self._tags.update({'file1': file1})
            self._tags.update({'file2': file2})
            return
        name, key, value = (line.split(' ', 2) + [None, None])[:3]

        if name == 'status':
            self._status = key
        if name == 'tag':
            self._tags.update({key: value})
        if name in ['duration', 'position']:
            self._tags.update({name: util.format.duration(int(key))})
        if name == 'set' and key == 'repeat':
            self._repeat = value == 'true'
        if name == 'set' and key == 'shuffle':
            self._shuffle = value == 'true'

    def _load_song(self):
        info = ''
        try:
            info = util.cli.execute('{cmd} -Q'.format(cmd=self._cmd))
        except RuntimeError:
            self._status = None

        self._tags = defaultdict(lambda: '')
        for line in info.split('\n'):
            self._eval_line(line)

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