from configparser import ConfigParser
import logging

import discord
from discord.ext import commands

TOKEN = 'MTE1NDc0ODQ3MzE4MzMwNTc4OQ.Gz_Q7u.02sb2YNV_QQy7Bs19roXlB62mjoMKA6y8aubHU' # Bot token (replace with your own)
DEFAULT_CONFIG_FILE = 'config.ini' # Configuration file with server IDs and study group roles
DEFAULT_LOG_FILE = 'kruhobot.log' # Log file for the bot
HELP_MESSAGE = """Usage: `!grant_role kruh-## UKCO`
- Replace `##` with your study group number
- Replace `UKCO` with your UKCO (8-digit personal number)."""

# Create an instance of the bot
intents = discord.Intents.default()
intents.members = True
intents.message_content = True

bot = commands.Bot(command_prefix='!', intents=intents)

logging.basicConfig(filename=DEFAULT_LOG_FILE, level=logging.INFO)
logger = logging.getLogger("Kruhobot")

config = ConfigParser()
config.read(DEFAULT_CONFIG_FILE)


async def reply_error(ctx, message: str):
    """
    Reply to the user with an error message.
    :param ctx: The context of the command.
    :param message: The error message.
    """
    await reply(ctx, f'**Error:** {message}')


async def reply(ctx, message: str):
    """
    Reply to the user.
    :param ctx: The context of the command or the channel from the event handler.
    :param message: The message to reply with.
    """
    await ctx.send(message)


@bot.event
async def on_ready():
    logger.info(f'Logged in as {bot.user.name}')


@bot.command()
async def grant_role(ctx, study_group_name: str, ukco: str):
    """
    Grant a role to the user based on the study group and UKCO.
    :param ctx: The context of the command.
    :param study_group_name: The name of the study group.
    :param ukco: The UKCO of the user.
    """
    # Check study group format
    if not study_group_name.startswith('kruh-') or not study_group_name[5:].isdigit():
        await reply_error(ctx, 'Invalid study group format.')
        await reply(ctx, HELP_MESSAGE)
        return

    # Check UKCO format
    if not ukco.isdigit() or not len(ukco) == 8:
        await reply_error(ctx, 'Invalid UKCO format.')
        await reply(ctx, HELP_MESSAGE)
        return

    for guild_id in server_ids:
        if study_group_name not in study_groups[guild_id]:  # Check if the study group is valid for the server
            continue

        guild = bot.get_guild(guild_id)
        if guild is None:  # Check if the guild exists
            continue

        role = discord.utils.get(guild.roles, id=study_groups[guild_id][study_group_name])
        if role is None:  # Check if the role exists
            continue

        author = guild.get_member(ctx.author.id)
        if author is None:  # Check if the author is a member of the guild
            continue

        await author.add_roles(role)
        await reply(ctx, f'{author.mention} has been granted the [{role.name}] role on the [{guild.name}] server.')
        logger.info(f'Granted role [{role.name}] to [{author.mention}] in [{guild.name}] corresponding to the study group [{study_group_name}].')
        return

    await reply_error(ctx, 'Something went wrong. Please check your command and try again.')
    logger.error(f'Failed to grant a role to [{author.mention}] corresponding to the study group [{study_group_name}].')
    return


async def check_command(message):
    # Split the message content into words
    words = message.content.split()

    if len(words) == 0:
        return False

    # Check if the message is a command
    if not words[0].startswith('!'):
        await reply(message.channel, HELP_MESSAGE)
        return False

    # Check if the command is recognized
    if not words[0] == '!grant_role':
        await reply_error(message.channel, 'Unrecognized command.')
        await reply(message.channel, HELP_MESSAGE)
        return False

    # Check if the number of arguments is correct
    if not len(words) == 3:
        await reply_error(message.channel, 'Invalid number of arguments.')
        await reply(message.channel, HELP_MESSAGE)
        return False

    return True


@bot.event
async def on_message(message):
    # Check if the message is a private message and not from the bot itself
    if not isinstance(message.channel, discord.DMChannel) or message.author == bot.user:
        return

    is_valid_command = await check_command(message)
    if not is_valid_command:
        return

    await bot.process_commands(message)


def init(config):
    """
    Initialize the server IDs and study groups from the configuration file.
    :param config: The configuration file.
    :return: A tuple with server IDs and study groups.
    """
    def get_section_server_id(section):
        return int(config[section]["server_ID"])

    server_ids = {get_section_server_id(section) for section in config.sections() if "server_ID" in config[section]}
    study_groups = {server_id: dict() for server_id in server_ids}

    for section in config.sections():
        server_id = get_section_server_id(section)
        if server_id is None:
            continue

        # Study group names are in style "kruh-XX", where XX is a two-digit number
        # Iterate over all from top to bottom
        for (key, value) in config.items(section):
            if key.startswith('kruh-'):
                study_groups[server_id][key] = int(value)

    return server_ids, study_groups


server_ids, study_groups = init(config)

# Run the bot
bot.run(TOKEN)