#!/usr/bin/env python3
"""
Displays help docs and examples for commands, as well as lists all commands
available.
"""
import random

from module import commands, example

@commands('help', 'commands')
@example('.help tell')
def help(bot, trigger):
	"""Shows a command's documentation, and possibly an example."""
	if trigger.group(2):
		name = trigger.group(2)
		name = name.lower()
		if name not in bot.commands:
			return
		cmd = bot.commands[name]
		docstring, examples = cmd.doc
		if examples:
			ex = random.choice(examples)

		bot.msg(docstring)
		if cmd.aliases:
			bot.msg("Aliases: " + ", ".join(cmd.aliases))
		if ex[0]:
			bot.msg("Ex. In: " + ex[0])
		if ex[1]:
			bot.msg("Ex. Out: " + ex[1])

	else:
		if trigger.owner:
			cmds = [cmd for _, cmd in bot.commands.items()]
		elif trigger.admin:
			cmds = [cmd for _, cmd in bot.commands.items() if cmd.priv <= 5]
		else:
			priv = bot.channels[trigger.channel].privileges[trigger.nick]
			cmds = [cmd for _, cmd in bot.commands.items() if cmd.priv <= priv]

		cmds = [cmd.name for cmd in cmds if cmd.canonical]
		cmds = sorted(cmds)
		msg = "Available commands: " + ", ".join(cmds)
		bot.msg(msg)