#!/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

def clean_docstring(doc):
	"""Cleans the docstring up a bit."""
	if not doc:
		return ''
	doc = doc.strip()
	doc = doc.replace("\t", "")
	doc = doc.replace("\n\n", "\x00")
	doc = doc.replace("\n", " ")
	doc = doc.replace("\x00", "\n")
	return doc

@commands('help', 'commands')
@example('.help tell')
def help(bot, trigger):
	"""Shows a command's documentation, and possibly an example."""
	if len(trigger.args) >= 2:
		command = trigger.args[1]
		command = command.lower()
		if command not in bot.commands:
			return bot.msg("Command not found.")

		func = bot.commands[command]
		doc = clean_docstring(func.__doc__)
		bot.msg(doc)

		aliases = [c for c, f in bot.commands.items() if f == func]
		aliases.remove(command)
		if aliases:
			bot.msg("Aliases: " + ", ".join(aliases))

		if hasattr(func, 'example'):
			ex = random.choice(func.example)
			bot.msg("Ex. In: " + ex[0])
			if ex[1]:
				bot.msg("Ex. Out: " + ex[1])

	else:
		funcs = [func for cmd, func in bot.commands.items()]
		if not trigger.owner:
			funcs = [f for f in funcs if not hasattr(f, 'require_owner')]
		if not trigger.admin:
			funcs = [f for f in funcs if not hasattr(f, 'require_admin')]

		cmds = {func.commands[0] for func in funcs}
		cmds = sorted(list(cmds))
		msg = "Available commands: " + ", ".join(cmds)
		bot.msg(msg)