import urllib
import urllib2
import simplejson

def get_from_url(url):
    opener = urllib2.build_opener()
    opener.addheaders = [('User-agent', 'zyons.com/1.0')]
    base_url = 'http://tagthe.net/api?view=json&url=%s' % url
    resp = opener.open( base_url )
    json = resp.read()
    return  simplejson.loads( json )

def get_from_text(text):
    data = urllib.urlencode({'text':text})
    opener = urllib2.build_opener()
    opener.addheaders = [('User-agent', 'zyons.com/1.0')]
    base_url = 'http://tagthe.net/api?view=json' # % data
    resp = opener.open( base_url, data )
    json = resp.read()
    return  simplejson.loads( json )

def get_from_text_or_url( text, url ):
    try:
        if text:
            json = get_from_text(text)
        else:
            if url:
                json = get_from_url(url)
            else:
                json={}
    except urllib2.HTTPError:
        if url:
            json = get_from_url(url)
        else:
            json={}
    return json

def tags_from_text( text, url):
    json = get_from_text_or_url(text,url)
    tags=[]
    try:
        for person in json['memes'][0]['dimensions']['person']:
            tags.append( person )
    except KeyError:
        pass

    try:
        for topic in json['memes'][0]['dimensions']['topic']:
            tags.append( topic )
    except KeyError:
        pass

    try:
        for loc in json['memes'][0]['dimensions']['location']:
            tags.append( loc )
    except KeyError:
        pass

    tag_hash={}
    for t in tags:
        if t.strip() == "":
            continue
        if t.strip() == "-":
            continue
        tag_hash[t] = t

    tags = tag_hash.keys()
    return tags