""" Python module for use in the SoCal Linux Expo exhibit.
project builtin functions. """

import string, urllib2, random
from PsychePostProcessor import PsychePostProcessor
from RSS import ns, CollectionChannel, TrackingChannel

class PsycheRss( PsychePostProcessor ):
    """
    Psyche object to get an RSS feed and return the desired number of
    news items.  If no number is specified, use the default number, 3.
    """
    phrases =   [   'well', 'in detail', 'specifically', 'basically',
                    'what happened was', 'umm', 'ah', 'see' ]
    def __init__( self, args ):
        """
        Run the command get_rss(), and save its result using
        the inherired Set_Result().  args is a list input
        """
        try:
            num_entries =   int(args[1])
        except IndexError:
            num_entries =   3
        self.set_result(self.get_rss(args[0], num_entries))
       
    def get_rss( self, rssUrl, num_entries ):
        """
        Get the rss feed and format it.
        """
        self.tc         =   TrackingChannel()
        try:
            self.tc.parse(rssUrl)
        except (OSError, urllib2.URLError):
            return 'I could not find the RSS feed, %s.\n'%rssUrl
                    
        RSS10_TITLE     =   (ns.rss10, 'title')
        RSS10_DESC      =   (ns.rss10, 'description')
        items           =   self.tc.listItems()
        output          =   []
        for i in range(num_entries):
            try:
                item_data = self.tc.getItem(items[i])
            except IndexError:
                break
            t= item_data.get(RSS10_TITLE, "(none)")
            d= item_data.get(RSS10_DESC, "(none)")
            intro       =   self.phrases[random.randint(0,len(self.phrases)-1)]
            if i == 0:
                lead    =   ''
            else:
                lead    =   'next, '
            output.append('%sheadline %d: %s:\n %s, %s\n'%(lead,i+1,t,intro,d))
        return string.join(output)

################################################################################

if __name__ == '__main__':
    f   =   ['file:///home/flatline/documents/psyche/sample_data/slashdot.rss']
    rss =   PsycheRss(f)
    print rss.get_result()