from __future__ import print_function
from argparse import ArgumentParser

try:
    # python2
    from urlparse import urlparse, urlunparse
    from urllib2 import urlopen, URLError, HTTPError
    from urllib import urlencode
    input = raw_input
except ImportError:
    # python3
    from urllib.parse import urlparse, urlunparse, urlencode
    from urllib.request import urlopen, URLError, HTTPError

import json, os, sys

def get_api(url, cmd=None, data=None, verbose=False):
    try:
        useurl = url+cmd
        if data:
            useurl += "?"+urlencode(data)
        # data['apikey'] = "7c8faa070c97f83d8f705c935a32d5141f89cbaa2158042fa92e8ddad5dbc5e1"
        if verbose:
            print ("trying", useurl, file=sys.stderr)
        resp = urlopen(useurl).read()
        resp = resp.decode("utf-8")
        resp = json.loads(resp)
        if "code" in resp and "message" in resp:
            return resp
    except ValueError as e:
        if verbose:
            print ("  ValueError", e, file=sys.stderr)
        return
    except HTTPError as e:
        if verbose:
            print ("  HTTPError", e, file=sys.stderr)
        if e.code == 401:
            # Unauthorized is how the API responds to an incorrect API key
            return {"code": 401, "message": e}
            # resp = json.load(e)
            # if "code" in resp and "message" in resp:
            #     # print ("returning", resp, file=sys.stderr)
            #     return resp

def tryapiurl (url, verbose=False):
    """
    Try to use url as api, correcting if possible.
    Returns corrected / normalized URL, or None if not possible
    """
    try:
        scheme, netloc, path, params, query, fragment = urlparse(url)
        if scheme == "":
            url = "http://" + url
        scheme, netloc, path, params, query, fragment = urlparse(url)            
        params, query, fragment = ("", "", "")
        path = path.strip("/")
        # 1. try directly...
        apiurl = urlunparse((scheme, netloc, path, params, query, fragment))+"/"
        if get_api(apiurl, "listAllPads", verbose=verbose):
            return apiurl
        # 2. try with += api/1.2.9
        path = os.path.join(path, "api", "1.2.9")+"/"
        apiurl = urlunparse((scheme, netloc, path, params, query, fragment))
        if get_api(apiurl, "listAllPads", verbose=verbose):
            return apiurl
    # except ValueError as e:
    #     print ("ValueError", e, file=sys.stderr)
    except URLError as e:
        print ("URLError", e, file=sys.stderr)

def main(args):
    p = ArgumentParser("initialize an etherpump folder")
    p.add_argument("arg", nargs="*", default=[], help="optional positional args: path etherpadurl")
    p.add_argument("--path", default=None, help="path to initialize")
    p.add_argument("--padurl", default=None, help="")
    p.add_argument("--apikey", default=None, help="")
    p.add_argument("--verbose", default=False, action="store_true", help="")
    p.add_argument("--reinit", default=False, action="store_true", help="")
    args = p.parse_args(args)


    path = args.path
    if path == None and len(args.arg):
        path = args.arg[0]
    if not path:
        path = "."

    edpath = os.path.join(path, ".etherpump")
    try:
        os.makedirs(edpath)
    except OSError:
        pass

    padinfo = {}
    padinfopath = os.path.join(edpath, "settings.json")
    try:
        with open(padinfopath) as f:
            padinfo = json.load(f)
        if not args.reinit:
            print ("Folder is already initialized. Use --reinit to reset settings.")
            sys.exit(0)
    except IOError:
        pass
    except ValueError:
        # bad json file, reset it
        pass

    apiurl = args.padurl
    while True:
        if apiurl:
            apiurl = tryapiurl(apiurl,verbose=args.verbose)
        if apiurl:
            # print ("Got APIURL: {0}".format(apiurl))
            break
        apiurl = input("Please type the URL of the etherpad: ").strip()
    padinfo["apiurl"] = apiurl
    apikey = args.apikey
    while True:
        if apikey:
            resp = get_api(apiurl, "listAllPads", {"apikey": apikey}, verbose=args.verbose)
            if resp and resp["code"] == 0:
                # print ("GOOD")
                break
            else:
                print ("bad")
        print ("The APIKEY is the contents of the file APIKEY.txt in the etherpad folder", file=sys.stderr)
        apikey = input("Please paste the APIKEY: ").strip()
    padinfo["apikey"] = apikey

    with open(padinfopath, "w") as f:
        json.dump(padinfo, f, indent=2)