import os
import re
import time
import discord
import sound
import configparser
from discord.ext import commands
from subprocess import Popen, PIPE


# Init class for bot
class Bot(commands.Bot):
    def __init__(self, **kwargs):
        # If there is no custom command prefix (!help, ?help, etc.), use '>!' but also accept @ mentions
        if 'command_prefix' not in kwargs.keys():
            kwargs['command_prefix'] = '>!'
        commands.Bot.__init__(self, command_prefix=commands.when_mentioned_or(kwargs['command_prefix']),
                              activity=discord.Game(name=f"@me"), status=discord.Status.idle)

        # Init the core bot variables
        self.DEVICE_ID = kwargs['Device_ID']
        self.DEVICE_NAME = kwargs['Device_Name']
        self.BOT_TOKEN = kwargs['Token']
        self.Default_Channel_ID = kwargs['Channel_ID']
        self.Default_Mention_Group = kwargs['Mention_Group']

        # Init the audio devices list
        self.Devices_List = sound.query_devices().items()

        # Init radio parameters
        self.profile_name = None
        self.freq = "104.7M"
        self.freq_re = re.compile('(\d+\.?\d*M)')
        self.mode = "wbfm"
        self.gain = 40
        self.squelch = 0
        self.sample_rate = "200k"
        self.play_sample_rate = '32k'
        self.sample_rate_re = re.compile('(\d+\.?\d*k)')

        # Init SDR Variables
        self.sdr_process = None
        self.system_os_type = None
        self.sdr_output_process = None
        self.sdr_started = False

        # Set linux or windows
        self.check_os_type()

        # Add discord commands to the bot
        self.add_commands()

        # Check the ./modules folder for any modules (cog.py)
        self.check_for_modules()

    # Start the bot
    def start_bot(self):
        self.run(self.BOT_TOKEN)

    # Add discord commands to the bot
    def add_commands(self):
        # Test command to see if the bot is on (help command can also be used)
        @self.command(help="Use this to test if the bot is alive", brief="Sends a 'pong' in response")
        async def ping(ctx):
            await ctx.send('pong')

        # Command to join the bot the voice channel the user who called the command is in
        @self.command(help="Use this command to join the bot to your channel",
                      brief="Joins the voice channel that the caller is in")
        async def join(ctx, *, member: discord.Member = None):
            member = member or ctx.author.display_name

            # Wait for the bot to be ready to connect
            await self.wait_until_ready()

            # Load respective opus library
            self.load_opus()

            if discord.opus.is_loaded():
                # Create an audio stream from selected device
                stream = sound.PCMStream()
                channel = ctx.author.voice.channel
                await ctx.send(f"Ok {member}, I'm joining {channel}")

                # Ensure the selected device is available and start the audio stream
                stream.change_device(self.DEVICE_ID)

                # Join the voice channel with the audio stream
                voice_connection = await channel.connect()
                voice_connection.play(discord.PCMAudio(stream))

                # Start the SDR and begin playing to the audio stream
                self.start_sdr()

                # Change the activity to the channel and band-type being used
                self.set_activity()

            else:
                # Return that the opus library would not load
                await ctx.send("Opus won't load")

        @self.command(help="Use this command to have the bot leave your channel",
                      brief="Leaves the current voice channel")
        async def leave(ctx):
            # Disconnect the client from the voice channel
            await ctx.voice_client.disconnect()
            # Change the presence to away and '@ me'
            self.set_activity(False)
            # Stop the SDR so it can cool off
            self.stop_sdr()

        @self.command(name='chfreq', help="Use this command to change the frequency the bot is listening to. Note: 'M'"
                                          "is required\nExample command: '@ chfreq wbfm 104.7M\n"
                                          "Example command: '@ chfreq fm 154.785M",
                      brief="Changes radio frequency")
        async def chfreq(ctx, mode: str, freq: str, member: discord.Member = None):
            # Possible band-types that can be used
            possible_modes = ['wbfm', 'fm']
            member = member or ctx.author.display_name

            # Check to make sure the frequency input matches the syntax needed
            if self.freq_re.search(freq):
                self.freq = freq
                # Check to make sure the selected mode is valid
                if mode in possible_modes:
                    self.mode = mode
                    await ctx.send(f"Ok {member}, I'm changing the mode to {str(self.mode).upper()} and frequency to"
                                   f" {self.freq}")
                    # If the SDR is started, restart it with the updates
                    if self.sdr_started:
                        self.start_sdr()
                        self.set_activity()
                else:
                    await ctx.send(f"{member}, {mode} is not valid. You may only enter 'fm' or 'wbfm'")
            else:
                await ctx.send(f"{member}, {freq} is not valid. please refer to the help page '@ help chfreq'")

        @self.command(name='chsquelch', help="Use this command to change the squelch for the frequency"
                                             "the bot is listening to",
                      brief="Changes radio squelch")
        async def chsquelch(ctx, squelch: int, member: discord.Member = None):
            member = member or ctx.author.display_name
            self.squelch = squelch
            await ctx.send(f"Ok {member}, I'm changing the squelch to {self.squelch}")

            # If the SDR is started, restart it with the updates
            if self.sdr_started:
                self.start_sdr()

        @self.command(name='chgain', help="Use this command to change the radio gain for the bot",
                      brief="Changes radio gain")
        async def chgain(ctx, gain: int, member: discord.Member = None):
            member = member or ctx.author.display_name
            self.gain = gain
            await ctx.send(f"Ok {member}, I have changed the gain to {self.gain}")

            # If the SDR is started, restart it with the updates
            if self.sdr_started:
                self.start_sdr()

        @self.command(name='chbw', help="Use this command to change the center frequency bandwidth for the bot."
                                        "Note: 'k' is required\nExample Command: '@ chbw <xxx.xxk'",
                      brief="Changes radio bandwidth")
        async def chbw(ctx, sample_rate: str, member: discord.Member = None):
            member = member or ctx.author.display_name
            if self.sample_rate_re.search(sample_rate):

                # Check to see if sampling rate of player needs to be changed
                if '.' in sample_rate:
                    if len(sample_rate.split('.')[0]) <= 2:
                        self.sample_rate = sample_rate
                        self.play_sample_rate = "12k"
                    else:
                        self.sample_rate = sample_rate
                        self.play_sample_rate = "32k"
                else:
                    if len(sample_rate.split('k')[0]) <= 2:
                        self.sample_rate = sample_rate
                        self.play_sample_rate = "12k"
                    else:
                        self.sample_rate = sample_rate
                        self.play_sample_rate = "32k"

                await ctx.send(f"Ok {member}, I'm changing the sample rate to {self.sample_rate}")

                # If the SDR is started, restart it with the updates
                if self.sdr_started:
                    self.start_sdr()
            else:
                await ctx.send(f"{member}, {sample_rate} is not valid. please refer to the help page '@ help chbw'")

        # Hidden admin commands
        @self.command(name='saveprofile', hidden=True)
        async def _saveprofile(ctx, profile_name: str, member: discord.Member = None):
            member = member or ctx.author.display_name
            self.save_radio_config(profile_name)
            await ctx.send(f"Ok {member}, I saved the current settings as {profile_name}")

        @self.command(name='loadprofile', hidden=True)
        async def _loadprofile(ctx, profile_name: str, member: discord.Member = None):
            member = member or ctx.author.display_name
            self.load_radio_config(profile_name)
            await ctx.send(f"Ok {member}, I loaded the settings saved as {profile_name}")

        @self.command(name='reload', hidden=True)
        async def _reload(ctx, module: str, member: discord.Member = None):
            """Reloads a module."""
            member = member or ctx.author.display_name
            if self.reload_modules(module):
                await ctx.send(f"Ok {member}, I reloaded {module}")
            else:
                await ctx.send(f"{member}, something went wrong. Please check the console")
                
        @self.command(name='startsdr', hidden=True)
        async def _startsdr(ctx, member: discord.Member = None):
            member = member or ctx.author.display_name
            self.start_sdr()

        @self.command(name='stopsdr', hidden=True)
        async def _stopsdr(ctx, member: discord.Member = None):
            member = member or ctx.author.display_name
            self.stop_sdr()

    def load_opus(self):
        # Check the system type and load the correct library
        if self.system_os_type == 'Linux':
            discord.opus.load_opus('./opus/libopus.so')
        elif self.system_os_type == 'Windows':
            discord.opus.load_opus('./opus/libopus.dll')

    def check_device(self):
        # Check to make sure the selected device is still available and has not changed it's index
        for device, index in self.Devices_List:
            if int(index) == self.DEVICE_ID and str(device) == self.DEVICE_NAME:
                return True

        for device, index in self.Devices_List:
            if str(device) == self.DEVICE_NAME:
                self.DEVICE_ID = int(index)
                return True

        else:
            return False

    def check_for_modules(self):
        # Search the ./modules folder for any modules to load
        # A valid module must be built as a 'cog', refer to the docs for more information
        for folder_name in os.listdir("modules"):
            if str(folder_name)[0] == '.':
                continue
            elif os.path.exists(os.path.join("modules", folder_name, "cog.py")):
                print(f"Loaded extension: {folder_name}")
                self.load_extension(f"modules.{folder_name}.cog")

    def reload_modules(self, module):
        # Reload a selected module for changes
        try:
            self.unload_extension(f"modules.{module}.cog")
            print(f"Unloaded {module}")
            self.load_extension(f"modules.{module}.cog")
            print(f"Loaded {module}")
            return True
        except Exception as e:
            print(e)
            return False

    def check_os_type(self):
        # Check and store the OS type of the system for later use
        if os.name == 'nt':
            self.system_os_type = 'Windows'
        else:
            self.system_os_type = 'Linux'

    def start_sdr(self):
        # Check to see if there is only one frequency
        if type(self.freq) == str:
            # Single freq sent
            # Stop the SDR if it is running
            self.stop_sdr()

            # Start the radio
            print(f"Starting freq: {self.freq}")
            # Start the SDR receiver and pipe the output
            self.sdr_process = Popen(["rtl_fm", "-M", str(self.mode), "-f", str(self.freq), "-g", str(self.gain),
                                      "-l", str(self.squelch), "-s", str(self.sample_rate)],
                                     stdout=PIPE)
            # Use the piped output of the SDR receiver to generate audio
            self.sdr_output_process = Popen(["play", "-t", "raw", "-r", str(self.play_sample_rate), "-es", "-b",
                                             "16", "-c", "1", "-V1", "-"],
                                            stdin=self.sdr_process.stdout)
            # Set the started variable for later checks
            self.sdr_started = True

    def stop_sdr(self):
        # Check to see if the SDR is running
        if self.sdr_started:
            # Wait for the running processes to close
            while self.sdr_process.poll() is None and self.sdr_output_process.poll() is None:
                self.sdr_process.terminate()
                self.sdr_process.kill()
                time.sleep(1)
                self.sdr_output_process.terminate()
                self.sdr_output_process.kill()
                time.sleep(1)

            self.sdr_started = False

    def set_activity(self, connected=True):
        if connected:
            if self.profile_name is None:
                await self.change_presence(activity=discord.Activity(type=discord.ActivityType.listening,
                                                                     name=f"{self.freq[:-1]}"
                                                                          f" {str(self.mode).upper()}"),
                                           status=discord.Status.online)
            elif type(self.profile_name) == str:
                await self.change_presence(activity=discord.Activity(type=discord.ActivityType.listening,
                                                                     name=f"{str(self.profile_name).upper()}"),
                                           status=discord.Status.online)
        elif not connected:
            await self.change_presence(activity=discord.Game(name=f"@ me"), status=discord.Status.idle)

    def save_radio_config(self, profile_name):
        config = configparser.SafeConfigParser()

        if os.path.exists('./profiles.ini'):
            config.read('./profiles.ini')

        if not config.has_section(str(profile_name)):
            config.add_section(str(profile_name))

        config[str(profile_name)]['Frequency'] = self.freq
        config[str(profile_name)]['Mode'] = self.mode
        config[str(profile_name)]['Gain'] = str(self.gain)
        config[str(profile_name)]['Squelch'] = str(self.squelch)
        config[str(profile_name)]['Sample Rate'] = self.sample_rate
        config[str(profile_name)]['Player Sample Rate'] = self.play_sample_rate

        with open('./profiles.ini', 'w+') as config_file:
            config.write(config_file)

        if self.sdr_started:
            self.start_sdr()
            self.set_activity()

    def load_radio_config(self, profile_name):
        config = configparser.ConfigParser()
        config.read('./profiles.ini')

        self.freq = config[str(profile_name)]['Frequency']
        self.mode = config[str(profile_name)]['Mode']
        self.gain = int(config[str(profile_name)]['Gain'])
        self.squelch = int(config[str(profile_name)]['Squelch'])
        self.sample_rate = config[str(profile_name)]['Sample Rate']
        self.play_sample_rate = config[str(profile_name)]['Player Sample Rate']

        if self.sdr_started:
            self.start_sdr()
            self.set_activity()