#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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# modification, are permitted provided that the following conditions are met:
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#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
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#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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###

"""
Provides basic functionality for handling RSS/RDF feeds.  Depends on the Alias
module for user-friendliness.
"""

import plugins

import time
from itertools import imap

import rssparser

import utils
import privmsgs
import callbacks

def configure(onStart, afterConnect, advanced):
    from questions import expect, anything, something, yn
    onStart.append('load RSS')
    if 'load Alias' not in onStart:
        print 'The RSS configure questions need the Alias plugin, but it is '
        print 'not loaded.'
        if yn('Do you want to load that plugin now?') == 'y':
            onStart.append('load Alias')
        else:
            print 'You can still use the RSS plugin, but you won\'t be asked'
            print 'any further questions.'
            return
    prompt = 'Would you like to add an RSS feed?'
    while yn(prompt) == 'y':
        prompt = 'Would you like to add another RSS feed?'
        name = something('What\'s the name of the website?')
        url = something('What\'s the URL of the RSS feed?')
        onStart.append('alias %s "rss %s"' % (name, url))
        onStart.append('freeze %s' % name)

class RSS(callbacks.Privmsg):
    threaded = True
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        self.lastRequest = {}
        self.cachedFeeds = {}

    def rss(self, irc, msg, args):
        """<url>

        Gets the title components of the given RSS feed.
        """
        url = privmsgs.getArgs(args)
        now = time.time()
        if url not in self.lastRequest or now - self.lastRequest[url] > 1800:
            results = rssparser.parse(url)
            self.cachedFeeds[url] = results
            self.lastRequest[url] = now

        feed = self.cachedFeeds[url]
        headlines = [utils.htmlToText(d['title'].strip())
                     for d in feed['items']]
        if not headlines:
            irc.error(msg, 'Error grabbing RSS feed')
            return
        headlines = imap(utils.htmlToText, headlines)
        irc.reply(msg, ' :: '.join(headlines))

    def info(self, irc, msg, args):
        """<url>

        Returns information from the given RSS feed, namely the title,
        URL, description, and last update date, if available.
        """
        url = privmsgs.getArgs(args)
        now = time.time()
        if url not in self.lastRequest or now - self.lastRequest[url] > 1800:
            results = rssparser.parse(url)
            self.cachedFeeds[url] = results
            self.lastRequest[url] = now

        feed = self.cachedFeeds[url]
        info = feed['channel']
        if not info:
            irc.error(msg, 'Error grabbing RSS feed')
            return
        # check the 'modified' key, if it's there, convert it here first
        if 'modified' in feed:
            seconds = time.mktime(feed['modified'])
            now = time.mktime(time.gmtime())
            when = utils.timeElapsed(now - seconds) + ' ago'
        else:
            when = "time unavailable"
        # The rest of the entries are all available in the channel key
        response = 'Title: %s;  URL: <%s>;  ' \
                   'Description: %s;  Last updated %s.' % (
                       info.get('title', 'unavailable').strip(),
                       info.get('link', 'unavailable').strip(),
                       info.get('description', 'unavailable').strip(),
                       when)
        irc.reply(msg, ' '.join(response.split()))


Class = RSS

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