#!/usr/bin/env python3
import argparse
import logging
import sys
from pathlib import Path

import discord
import discord.utils
from discord.ext import commands

import utils
from GameFiles import GamesFile

logger = logging.getLogger("SecretBot")


class SecretBot(commands.Cog):

	def __init__(self, games_file: GamesFile):
		super().__init__()
		self.bot = commands.Bot(
			"!",
			help_command = commands.MinimalHelpCommand(),
			intents = discord.Intents(guild_messages = True, guilds = True, members = True),
			allowed_mentions = discord.AllowedMentions.none(),  # By default we do not allow mentions, as we will white-list them on each required message
		)
		self.bot.add_cog(self)
		self.games_file = games_file

	def run(self, token):
		self.bot.run(token)

	def get_command_usage_message(self, command: commands.Command, prepend = "Usage: ") -> str:
		command_elements = [str(cmd) for cmd in command.parents] + [command.name]
		return f"{prepend}`{self.bot.command_prefix}{' '.join(command_elements)} {command.signature}`"

	@commands.Cog.listener()
	async def on_ready(self):
		logger.info("Connected and ready!")
		logger.info(f"Logged in as {utils.to_string(self.bot.user)}")

		oauth_url = discord.utils.oauth_url(
			self.bot.user.id,
			discord.Permissions(read_messages = True, send_messages = True, manage_channels = True, manage_roles = True, mention_everyone = True, manage_messages = True)
		)
		logger.info(f"You can invite the bot to your server using the following link: {oauth_url}")

	@commands.Cog.listener()
	async def on_command_error(self, ctx: commands.Context, error: commands.CommandError):
		if isinstance(error, commands.CommandNotFound):
			return await ctx.reply(f":x: The requested command does not exist")
		elif isinstance(error, commands.MissingRequiredArgument):
			return await ctx.reply(f":x: Missing required argument {error.param}. {self.get_command_usage_message(ctx.command)}")
		elif isinstance(error, commands.TooManyArguments):
			return await ctx.reply(f":x: too many arguments for command {ctx.command}. {self.get_command_usage_message(ctx.command)}")
		elif isinstance(error, commands.BadArgument):
			if hasattr(error, "argument"):
				return await ctx.reply(f":x: I could not correctly understand argument {error.argument}. {self.get_command_usage_message(ctx.command)}")
			else:
				return await ctx.reply(f":x: I could not correctly understand one of the arguments. {self.get_command_usage_message(ctx.command)}")
		elif isinstance(error, commands.ArgumentParsingError):
			return await ctx.reply(f":x: Error when parsing the command: {error}")
		elif isinstance(error, commands.CheckFailure):
			if isinstance(error, utils.CheckFailDoNotNotify):  # A check failed, but the check function asked that we do not notify the user
				return
			else:
				return await ctx.reply(f":x: this command can not be run: {error}")
		else:
			logger.error(f"Error when running command '{ctx.message.content}' by {utils.to_string(ctx.author)} in {utils.to_string(ctx.guild)}", exc_info = error)
			await ctx.reply(f":x: There was an error with the command :dizzy_face:")

	def cog_check(self, ctx: commands.Context):
		# We silently ignore messages from bots, since we do not want bots to command us
		if ctx.author.bot or ctx.message.is_system():
			logger.info(f"[{utils.to_string(ctx.guild)}] Ignored command message from bot or system: {ctx.message.content}")
			raise utils.CheckFailDoNotNotify
		return True

	async def check_is_administrator_or_owner(self, ctx: commands.Context):
		"""
		Verify if the user has administrator rights or if it is the bot's owner. Notifies the user and raises utils.CheckFailDoNotNotify if not.
		"""
		if not (ctx.author.guild_permissions.administrator or await self.bot.is_owner(ctx.author)):
			await ctx.reply(f":dragon_face: You have no power here!")
			raise utils.CheckFailDoNotNotify

	@commands.command(help = "See if I'm alive")
	async def ping(self, ctx: commands.Context):
		await ctx.reply(":ping_pong:", mention_author = True)

	@commands.command("StartGame")
	async def start_game(self, ctx: commands.Context, gm_role: discord.Role, player_role: discord.Role):
		game = self.games_file[ctx.guild]
		if game.is_started():
			await ctx.reply(":x: a game is already running")
		else:
			await ctx.guild.get_member(self.bot.user.id).add_roles(gm_role)
			await game.start(ctx.guild, gm_role, player_role)

	@commands.command("DeleteGame", help = "Delete a running game and all of its associated channels")
	async def delete_game(self, ctx: commands.Context):
		game = self.games_file[ctx.guild]
		if game.is_started():
			gm_role = discord.Object(game.get_gm_role())  # We need to get the role before the game is deleted
			await game.delete(ctx.guild)
			await ctx.guild.get_member(self.bot.user.id).remove_roles(gm_role)
		else:
			await ctx.reply(":x: Game is not running")


if __name__ == '__main__':
	argparser = argparse.ArgumentParser(description = "Secret Hitler helper bot", formatter_class = argparse.ArgumentDefaultsHelpFormatter)
	argparser.add_argument("-t", "--token-file", default = "token", help = "File where the discord bot token is stored")
	argparser.add_argument("-g", "--games-file", default = "games.json", help = "File used to store game information so that the bot can be stopped safely")
	argparser.add_argument("-v", "--verbose", action = "count", default = 0, help = "Specify once to print bot debug messages, specify twice to print discord.py debug messages as well")

	ARGS = argparser.parse_args()

	logging.basicConfig(
		format = "%(asctime)s %(name)s [%(levelname)s] %(message)s"
	)

	if ARGS.verbose == 0:
		logging.root.setLevel(logging.INFO)
	elif ARGS.verbose == 1:
		logging.root.setLevel(logging.DEBUG)
		logging.getLogger("discord").setLevel(logging.INFO)
	else:
		logging.root.setLevel(logging.DEBUG)

	logger.info(f"Using discord.py version {discord.__version__}")

	token_file_path = Path(ARGS.token_file).absolute()
	if not token_file_path.is_file():
		logger.error(f"Token file {token_file_path} does not exist")
		sys.exit(1)
	with token_file_path.open("r") as token_file:
		token = token_file.readline().strip()

	games_file = GamesFile(ARGS.games_file)
	bot = SecretBot(games_file)
	bot.run(token)