# coding=utf-8
# Copyright 2008-9, Sean B. Palmer, inamidst.com
# Copyright 2012, Elsie Powell, embolalia.com
# Licensed under the Eiffel Forum License 2.
from __future__ import unicode_literals, absolute_import, print_function, division

import re
import requests
from module import commands, example
import json
import sys

if sys.version_info.major < 3:
	from urllib import quote_plus
else:
	from urllib.parse import quote_plus


def formatnumber(n):
	"""Format a number with beautiful commas."""
	parts = list(str(n))
	for i in range((len(parts) - 3), 0, -3):
		parts.insert(i, ',')
	return ''.join(parts)

r_bing = re.compile(r'<h3><a href="([^"]+)"')


def bing_search(query, lang='en-GB'):
	base = 'http://www.bing.com/search?mkt=%s&q=' % lang
	bytes = requests.get(base + query)
	m = r_bing.search(bytes)
	if m:
		return m.group(1)

r_duck = re.compile(r'nofollow" class="[^"]+" href="(?!https?:\/\/r\.search\.yahoo)(.*?)">')


def duck_search(query):
	query = query.replace('!', '')
	uri = 'http://duckduckgo.com/html/?q=%s&kl=uk-en' % query
	bytes = requests.get(uri)
	if 'requests-result' in bytes:  # filter out the adds on top of the page
		bytes = bytes.split('requests-result')[1]
	m = r_duck.search(bytes)
	if m:
		return requests.decode(m.group(1))

# Alias google_search to duck_search
google_search = duck_search


def duck_api(query):
	if '!bang' in query.lower():
		return 'https://duckduckgo.com/bang.html'

	# This fixes issue #885 (https://github.com/sopel-irc/sopel/issues/885)
	# It seems that duckduckgo api redirects to its Instant answer API html page
	# if the query constains special charactares that aren't urlencoded.
	# So in order to always get a JSON response back the query is urlencoded
	query = quote_plus(query)
	uri = 'http://api.duckduckgo.com/?q=%s&format=json&no_html=1&no_redirect=1' % query
	results = json.loads(requests.get(uri))
	if results['Redirect']:
		return results['Redirect']
	else:
		return None


@commands('duck', 'ddg', 'g')
@example('.duck privacy or .duck !mcwiki obsidian')
def duck(bot, trigger):
	"""Queries Duck Duck Go for the specified input."""
	query = trigger.group(2)
	if not query:
		return bot.reply('.ddg what?')

	# If the API gives us something, say it and stop
	result = duck_api(query)
	if result:
		bot.reply(result)
		return

	# Otherwise, look it up on the HTMl version
	uri = duck_search(query)

	if uri:
		bot.reply(uri)
		if 'last_seen_url' in bot.memory:
			bot.memory['last_seen_url'][trigger.sender] = uri
	else:
		bot.reply("No results found for '%s'." % query)


@commands('search')
@example('.search nerdfighter')
def search(bot, trigger):
	"""Searches Bing and Duck Duck Go."""
	if not trigger.group(2):
		return bot.reply('.search for what?')
	query = trigger.group(2)
	bu = bing_search(query) or '-'
	du = duck_search(query) or '-'

	if bu == du:
		result = '%s (b, d)' % bu
	else:
		if len(bu) > 150:
			bu = '(extremely long link)'
		if len(du) > 150:
			du = '(extremely long link)'
		result = '%s (b), %s (d)' % (bu, du)

	bot.reply(result)