import sqlite3
import urllib
import xml.etree.ElementTree as ET

TWITTER_URL = 'http://api.twitter.com/l/statuses/friends/ACCT.xml'

conn = sqlite3.connect('twdata.db')
cur = conn.cursor()

cur.execute('''CREATE TABLE IF NOT EXISTS People 
    (id INTEGER PRIMARY KEY, name TEXT UNIQUE, retrieved INTEGER)''')
cur.execute('''CREATE TABLE IF NOT EXISTS Follows 
    (from_id INTEGER, to_id INTEGER, UNIQUE(from_id, to_id))''')

while True:
    acct = raw_input('Enter a Twitter account, or quit: ')
    if ( acct == 'quit' ) : break
    if ( len(acct) < 1 ) :
        cur.execute('SELECT id, name FROM People WHERE retrieved = 0 LIMIT 1')
        try:
            (id, acct) = cur.fetchone()
        except:
            print 'No unretrieved Twitter accounts found'
            continue
    else:
        cur.execute('SELECT id FROM People WHERE name = ? LIMIT 1', 
            (acct, ) )
        try:
            id = cur.fetchone()[0]
        except:
            cur.execute('INSERT OR IGNORE INTO People (name, retrieved) VALUES ( ?, 0)', 
                ( acct, ) )
            conn.commit()
            if cur.rowcount != 1 : 
                print 'Error inserting account:',acct
		continue
            id = cur.lastrowid

    url = TWITTER_URL.replace('ACCT', acct)
    print 'Retrieving', url
    document = urllib.urlopen (url).read()
    tree = ET.fromstring(document)

    cur.execute('UPDATE People SET retrieved=1 WHERE name = ?', (acct, ) )

    countnew = 0
    countold = 0
    for user in tree.findall('user'):
        friend = user.find('screen_name').text
        cur.execute('SELECT id FROM People WHERE name = ? LIMIT 1', 
            (friend, ) )
        try:
            friend_id = cur.fetchone()[0]
            countold = countold + 1
        except:
            cur.execute('''INSERT OR IGNORE INTO People (name, retrieved) 
                VALUES ( ?, 0)''', ( friend, ) )
            conn.commit()
            if cur.rowcount != 1 :
                print 'Error inserting account:',friend
                continue
            friend_id = cur.lastrowid
            countnew = countnew + 1
        cur.execute('INSERT OR IGNORE INTO Follows (from_id, to_id) VALUES (?, ?)',
            (id, friend_id) )
    print 'New accounts=',countnew,' revisited=',countold
    conn.commit()

cur.close()