#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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###

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

__revision__ = "$Id$"

import plugins

import sets
import time
import types
from itertools import imap

import rssparser

import conf
import utils
import privmsgs
import callbacks

def configure(onStart, afterConnect, advanced):
    from questions import expect, anything, something, yn
    onStart.append('load RSS')
    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('rss add %s %s' % (name, url))
        #onStart.append('alias lock %s' % name)

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

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

        Adds a command to this plugin that will look up the RSS feed at the
        given URL.
        """
        (name, url) = privmsgs.getArgs(args, required=2)
        docstring = """takes no arguments

        Reports the titles for %s at the RSS feed <%s>.  RSS feeds are only
        looked up every half hour at the most (since that's how most
        websites prefer it).
        """ % (name, url)
        name = callbacks.canonicalName(name)
        if hasattr(self, name):
            s = 'I already have a command in this plugin named %s' % name
            irc.error(msg, s)
            return
        def f(self, irc, msg, args):
            args.insert(0, url)
            self.rss(irc, msg, args)
        f = types.FunctionType(f.func_code, f.func_globals,
                               f.func_name, closure=f.func_closure)
        f.__doc__ = docstring
        self.feedNames.add(name)
        setattr(self.__class__, name, f)
        irc.reply(msg, conf.replySuccess)

    def remove(self, irc, msg, args):
        """<name>

        Removes the command for looking up RSS feeds at <name> from
        this plugin.
        """
        name = privmsgs.getArgs(args)
        name = callbacks.canonicalName(name)
        if name not in self.feedNames:
            irc.error(msg, 'That\'s not a valid RSS feed command name.')
            return
        delattr(self.__class__, name)
        irc.reply(msg, conf.replySuccess)
        
    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, 'Couldn\'t get 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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