#! /usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Wolfram|Alpha module for Sopel IRC bot framework
Forked from code by Max Gurela (@maxpowa):
https://github.com/maxpowa/inumuta-modules/blob/e0b195c4f1e1b788fa77ec2144d39c4748886a6a/wolfram.py
Updated and packaged for PyPI by dgw (@dgw)
"""

from config.types import StaticSection, ChoiceAttribute, ValidatedAttribute
from module import commands, example
import wolframalpha


@commands('wa', 'wolfram')
@example('.wa 2+2', '[W|A] 2+2 = 4')
@example('.wa python language release date', '[W|A] Python | date introduced = 1991')
def wa_command(bot, trigger):
	"""
	Queries WolframAlpha.
	"""
	msg = None
	if not trigger.group(2):
		msg = 'You must provide a query.'
	if not bot.config.wolfram.app_id:
		msg = 'Wolfram|Alpha API app ID not configured.'

	lines = (msg or wa_query(bot.config.wolfram.app_id, trigger.group(2), bot.config.wolfram.units)).splitlines()


	for line in lines:
		bot.say('[\x0304Wolfram\x03] {}'.format(line))


def wa_query(app_id, query, units='nonmetric'):
	if not app_id:
		return 'Wolfram|Alpha API app ID not provided.'
	client = wolframalpha.Client(app_id)
	query = query.encode('utf-8').strip()
	params = (
		('format', 'plaintext'),
		('units', units),
	)

	try:
		result = client.query(input=query, params=params)
	except AssertionError:
		return 'Temporary API issue. Try again in a moment.'
	except Exception as e:
		return 'Query failed: {} ({})'.format(type(e).__name__, e.message or 'Unknown error, try again!')

	num_results = 0
	try:
		num_results = int(result['@numpods'])
	finally:
		if num_results == 0:
			return 'No results found.'

	texts = []
	try:
		for pod in result.pods:
			try:
				texts.append(pod.text)
			except AttributeError:
				pass  # pod with no text; skip it
			except Exception:
				raise  # raise unexpected exceptions to outer try for bug reports
			if len(texts) >= 2:
				break  # len() is O(1); this cheaply avoids copying more strings than needed
	except Exception as e:
		return 'Unhandled {}; please report this query ("{}") at https://dgw.me/wabug'.format(type(e).__name__, query)

	try:
		input, output = texts[0], texts[1]
	except IndexError:
		return 'No text-representable result found; see http://wolframalpha.com/input/?i={}'.format(query)

	output = output.replace('\n', ' | ')
	if not output:
		return input
	return '\x0310{} \x03= \x0312{}'.format(input, output)