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# -*- coding: utf-8 -*-
import os
import re
import shlex
import subprocess
from subprocess import Popen, PIPE


def cmd_help():
    help_output = ''
    for command, info in COMMANDS_INVERTED.items():
        help_line = '/%s\n_%s_ \n\n' % (command, info[0])
        help_output += help_line
    return help_output.strip()


def cmd_temperature():
    cmd = shlex.split('/opt/vc/bin/vcgencmd measure_temp')
    p = Popen(cmd, stderr=PIPE, stdout=PIPE)
    o = p.communicate()[0]  # Example :: temp=45.6'C
    temp = o[5:].decode('utf-8')  # Add [:-2] if you want to strip 'C
    return 'My temperature is: *%s*' % temp


def cmd_monitor(state):
    monitor_file = os.path.join('/sys/class/backlight/rpi_backlight/bl_power')
    if state[0] == 'on':
        f = open(monitor_file, 'w')
        f.write('0')
        f.close()
        return 'Monitor turned ON'
    else:
        f = open(monitor_file, 'w')
        f.write('1')
        f.close()
        return 'Monitor turned OFF'


COMMANDS = {
    'help': (
        'Shows this list',
        cmd_help
    ),
    'temperature': (
        'Returns the current temperature of the Pi',
        cmd_temperature
    ),
    'monitor [on|off]': (
        'Turn monitor ON or OFF',
        cmd_monitor
    )
}
COMMANDS_INVERTED = {
    k: v for k, v in COMMANDS.items()
}


def is_command(message):
    first_character = message[:1]
    if first_character == '/':
        return True
    return False


def execute_command(message):

    # Check if the message is a command (first character must be a forward-slash /)
    if is_command(message):
        cmd = message[1:].split(' ')[0]  # Strip the forward-slash from the command
        args = message[1:].split(' ')[1:]
        for command, info in COMMANDS.items():
            command = re.sub(r'\[[^]]*\]', '', command).strip()
            if cmd == command:
                try:
                    if args:
                        return info[1](args)
                    return info[1]()
                except:
                    # return 'Command does not exist'
                    pass
    else:
        # return 'Hello, this is a Raspberry Pi!'
        pass

    return 'Unknown command, type /help to view available commands'  # Fallback