# This is part of Kaylee
# -- this code is licensed GPLv3
# Copyright 2015-2017 Clayton G. Hobbs
# Portions Copyright 2013 Jezra

"""Run shell commands that match voice commands

This Kaylee plugin can be used to perform the job of `Blather
<https://gitlab.com/jezra/blather>`__.  Its configuration is of the
following format::

    ".shell": {
        "VOICE_COMMAND": "SHELL_COMMAND",
        ...
    }

A VOICE_COMMAND may contain any number of the special word ``%d``,
which is a stand-in for a spoken number.  The spoken number is
transformed into a decimal integer which may be substituted into the
SHELL_COMMAND any number of times.  These substitutions are made by
writing ``{INDEX}`` in the SHELL_COMMAND, where INDEX is an integer
counting the ``%d`` strings from 0.  An example of this type of command
is::

    "%d is a number": "echo 'the number you said was {0}'"

"""

import subprocess

from .pluginbase import PluginBase
from ..numbers import NumberParser


class Plugin(PluginBase):
    """Run shell commands that match voice commands"""

    def __init__(self, config, name):
        """Initialize the shell plugin"""
        super().__init__(config, name)
        self.number_parser = NumberParser()
        self.commands = self.options

        for voice_cmd in self.commands.keys():
            self.corpus_strings.add(voice_cmd.strip().replace('%d', ''))

    def _run_command(self, cmd):
        """Print the command, then run it"""
        print(cmd)
        subprocess.call(cmd, shell=True)

    def recognizer_finished(self, recognizer, text):
        """Run the shell command corresponding to a recognized voice command

        Spoken number(s) may be substituted in the shell command.  The shell
        commands are printed immediately before they are executed.
        """
        numt, nums = self.number_parser.parse_all_numbers(text)
        # Is there a matching command?
        if text in self.commands:
            self.emit('processed', text)
            cmd = self.commands[text]
            self._run_command(cmd)
            return True
        # Is there a matching command with numbers substituted?
        elif numt in self.commands:
            self.emit('processed', text)
            cmd = self.commands[numt]
            cmd = cmd.format(*nums)
            self._run_command(cmd)
            return True
        else:
            return False