from urllib import urlencode
from os import makedirs
from os.path import dirname
import json
from datetime import datetime

def lookup(screenname=False, user_id=False):
    if screenname is False and user_id is False:
        raise ValueError("Suppy either screenname or user_id")

    params = {}
    
    if screenname:
        params["screen_name"] = screenname
    else:
        params["user_id"] = user_id

    return call_twitter_api("users/lookup.json",params)

def call_twitter_api(endpoint, params):
    """
    Calls twitter api, and parses returned json, than returns.

    string, {"string": ?} -> ?
    """

    query = "%s?%s" % (endpoint, urlencode(params,doseq=1))
    print query
    try:
        makedirs(dirname(query))
    except OSError:
        pass
        
    try:
        with open(query,"r") as dosya:
            raw_json = dosya.read()
            return json.loads(raw_json)
    except IOError:        
        url = "https://api.twitter.com/1/%s" % (query)
        conn = urlopen(url)
        raw_json = conn.read()

        conn.close()
        parsed  = json.loads(raw_json)
        if "error" not in parsed:  
            with open(query,"w") as dosya:
                dosya.write(raw_json)
        else:
            raise TwitterError(parsed["error"])
        
        return parsed


def get_follower_ids(screenname=False, user_id=False):
    
    if screenname is False and user_id is False:
        raise ValueError("Suppy either screenname or user_id")

    params = {}
    
    if screenname:
        params["screen_name"] = screenname
    else:
        params["user_id"] = user_id

    return call_twitter_api("followers/ids.json",params)["ids"]

def export_users(filename, user_ids):
    columnheaders = [
        "userid",
        "screenname",
        "fullname",
        "statusses",
        "friends",
        "followers",
        "favourites",
        "url",
        "lang",
        "location",
        "created",
        "timezone",
        ]

    headerline = ",".join("\"%s\"" % i for i in columnheaders) + "\n"
    lineformat = ",".join(["\"%s\""] * len(columnheaders)) + "\n"

    print lineformat
    
    with open(filename, "w") as dosya:
        dosya.write(headerline)
        now = datetime.now()
        for id in user_ids:
            try:
                user = lookup(user_id=id)[0]
            except IOError:
                continue
            except KeyError:
                continue

            dosya.write( (lineformat % (
                    user["id_str"],
                    user["screen_name"],
                    user["name"],
                    user["statuses_count"],
                    user["friends_count"],
                    user["followers_count"],
                    user["favourites_count"],
                    user["url"],
                    user["lang"],
                    user["location"],
                    user["created_at"],
                    user["time_zone"],
                    )).encode("utf-8"))